From 0e795b29787d2489aa097347007d9439a4f3690d Mon Sep 17 00:00:00 2001
From: zadam
Date: Mon, 21 Sep 2020 22:08:54 +0200
Subject: [PATCH] create note inline, #1237
---
libraries/ckeditor/ckeditor.js | 2 +-
libraries/ckeditor/ckeditor.js.map | 2 +-
src/public/app/dialogs/add_link.js | 2 --
src/public/app/dialogs/jump_to_note.js | 2 +-
src/public/app/services/note_autocomplete.js | 27 ++++++++++++++---
src/public/app/widgets/attribute_detail.js | 2 +-
src/public/app/widgets/attribute_editor.js | 27 ++++++++---------
src/public/app/widgets/promoted_attributes.js | 4 +--
.../app/widgets/type_widgets/editable_text.js | 29 +++----------------
src/public/app/widgets/type_widgets/empty.js | 2 +-
10 files changed, 46 insertions(+), 53 deletions(-)
diff --git a/libraries/ckeditor/ckeditor.js b/libraries/ckeditor/ckeditor.js
index 011530a30..5f9b66fe6 100644
--- a/libraries/ckeditor/ckeditor.js
+++ b/libraries/ckeditor/ckeditor.js
@@ -2,5 +2,5 @@
* @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md.
*/
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t=this.position,o=e.parent;if(null===o.parent&&0===e.offset)return{done:!0};if(o==this._boundaryStartParent&&e.offset==this.boundaries.start.offset)return{done:!0};let n;if(o instanceof No){if(e.isAtStart)return this.position=ei._createBefore(o),this._previous();n=o.data[e.offset-1]}else n=o.getChild(e.offset-1);if(n instanceof Nn)return this.shallow?(e.offset--,this.position=e,this._formatReturnValue("elementStart",n,t,e,1)):(e=new ei(n,n.childCount),this.position=e,this.ignoreElementEnd?this._previous():this._formatReturnValue("elementEnd",n,t,e));if(n instanceof No){if(this.singleCharacters)return e=new ei(n,n.data.length),this.position=e,this._previous();{let o,i=n.data.length;if(n==this._boundaryStartParent){const t=this.boundaries.start.offset;o=new zo(n,t,n.data.length-t),i=o.data.length,e=ei._createBefore(o)}else o=new zo(n,0,n.data.length),e.offset--;return this.position=e,this._formatReturnValue("text",o,t,e,i)}}if("string"==typeof n){let n;if(this.singleCharacters)n=1;else{const t=o===this._boundaryStartParent?this.boundaries.start.offset:0;n=e.offset-t}e.offset-=n;const i=new zo(o,e.offset,n);return this.position=e,this._formatReturnValue("text",i,t,e,n)}return e=ei._createBefore(o),this.position=e,this._formatReturnValue("elementStart",o,t,e,1)}_formatReturnValue(e,t,o,n,i){return t instanceof zo&&(t.offsetInText+t.data.length==t.textNode.data.length&&("forward"!=this.direction||this.boundaries&&this.boundaries.end.isEqual(this.position)?o=ei._createAfter(t.textNode):(n=ei._createAfter(t.textNode),this.position=n)),0===t.offsetInText&&("backward"!=this.direction||this.boundaries&&this.boundaries.start.isEqual(this.position)?o=ei._createBefore(t.textNode):(n=ei._createBefore(t.textNode),this.position=n))),{done:!1,value:{type:e,item:t,previousPosition:o,nextPosition:n,length:i}}}}class ei{constructor(e,t){this.parent=e,this.offset=t}get nodeAfter(){return this.parent.is("$text")?null:this.parent.getChild(this.offset)||null}get nodeBefore(){return this.parent.is("$text")?null:this.parent.getChild(this.offset-1)||null}get isAtStart(){return 0===this.offset}get isAtEnd(){const e=this.parent.is("$text")?this.parent.data.length:this.parent.childCount;return this.offset===e}get root(){return this.parent.root}get editableElement(){let e=this.parent;for(;!(e instanceof Yn);){if(!e.parent)return null;e=e.parent}return e}getShiftedBy(e){const t=ei._createAt(this),o=t.offset+e;return t.offset=o<0?0:o,t}getLastMatchingPosition(e,t={}){t.startPosition=this;const o=new Zn(t);return o.skip(e),o.position}getAncestors(){return this.parent.is("documentFragment")?[this.parent]:this.parent.getAncestors({includeSelf:!0})}getCommonAncestor(e){const t=this.getAncestors(),o=e.getAncestors();let n=0;for(;t[n]==o[n]&&t[n];)n++;return 0===n?null:t[n-1]}is(e){return"position"===e||"view:position"===e}isEqual(e){return this.parent==e.parent&&this.offset==e.offset}isBefore(e){return"before"==this.compareWith(e)}isAfter(e){return"after"==this.compareWith(e)}compareWith(e){if(this.root!==e.root)return"different";if(this.isEqual(e))return"same";const t=this.parent.is("node")?this.parent.getPath():[],o=e.parent.is("node")?e.parent.getPath():[];t.push(this.offset),o.push(e.offset);const n=Vo(t,o);switch(n){case"prefix":return"before";case"extension":return"after";default:return t[n]0?new this(o,n):new this(n,o)}static _createIn(e){return this._createFromParentsAndOffsets(e,0,e,e.childCount)}static _createOn(e){const t=e.is("$textProxy")?e.offsetSize:1;return this._createFromPositionAndShift(ei._createBefore(e),t)}}function oi(e){return!(!e.item.is("attributeElement")&&!e.item.is("uiElement"))}function ni(e){let t=0;for(const o of e)t++;return t}class ii{constructor(e=null,t,o){this._ranges=[],this._lastRangeBackward=!1,this._isFake=!1,this._fakeSelectionLabel="",this.setTo(e,t,o)}get isFake(){return this._isFake}get fakeSelectionLabel(){return this._fakeSelectionLabel}get anchor(){if(!this._ranges.length)return null;const e=this._ranges[this._ranges.length-1];return(this._lastRangeBackward?e.end:e.start).clone()}get focus(){if(!this._ranges.length)return null;const e=this._ranges[this._ranges.length-1];return(this._lastRangeBackward?e.start:e.end).clone()}get isCollapsed(){return 1===this.rangeCount&&this._ranges[0].isCollapsed}get rangeCount(){return this._ranges.length}get isBackward(){return!this.isCollapsed&&this._lastRangeBackward}get editableElement(){return this.anchor?this.anchor.editableElement:null}*getRanges(){for(const e of this._ranges)yield e.clone()}getFirstRange(){let e=null;for(const t of this._ranges)e&&!t.start.isBefore(e.start)||(e=t);return e?e.clone():null}getLastRange(){let e=null;for(const t of this._ranges)e&&!t.end.isAfter(e.end)||(e=t);return e?e.clone():null}getFirstPosition(){const e=this.getFirstRange();return e?e.start.clone():null}getLastPosition(){const e=this.getLastRange();return e?e.end.clone():null}isEqual(e){if(this.isFake!=e.isFake)return!1;if(this.isFake&&this.fakeSelectionLabel!=e.fakeSelectionLabel)return!1;if(this.rangeCount!=e.rangeCount)return!1;if(0===this.rangeCount)return!0;if(!this.anchor.isEqual(e.anchor)||!this.focus.isEqual(e.focus))return!1;for(const t of this._ranges){let o=!1;for(const n of e._ranges)if(t.isEqual(n)){o=!0;break}if(!o)return!1}return!0}isSimilar(e){if(this.isBackward!=e.isBackward)return!1;const t=ni(this.getRanges());if(t!=ni(e.getRanges()))return!1;if(0==t)return!0;for(let t of this.getRanges()){t=t.getTrimmed();let o=!1;for(let n of e.getRanges())if(n=n.getTrimmed(),t.start.isEqual(n.start)&&t.end.isEqual(n.end)){o=!0;break}if(!o)return!1}return!0}getSelectedElement(){return 1!==this.rangeCount?null:this.getFirstRange().getContainedElement()}setTo(e,t,o){if(null===e)this._setRanges([]),this._setFakeOptions(t);else if(e instanceof ii||e instanceof ri)this._setRanges(e.getRanges(),e.isBackward),this._setFakeOptions({fake:e.isFake,label:e.fakeSelectionLabel});else if(e instanceof ti)this._setRanges([e],t&&t.backward),this._setFakeOptions(t);else if(e instanceof ei)this._setRanges([new ti(e)]),this._setFakeOptions(t);else if(e instanceof Mo){const n=!!o&&!!o.backward;let i;if(void 0===t)throw new mo.b("view-selection-setTo-required-second-parameter: selection.setTo requires the second parameter when the first parameter is a node.",this);i="in"==t?ti._createIn(e):"on"==t?ti._createOn(e):new ti(ei._createAt(e,t)),this._setRanges([i],n),this._setFakeOptions(o)}else{if(!xo(e))throw new mo.b("view-selection-setTo-not-selectable: Cannot set selection to given place.",this);this._setRanges(e,t&&t.backward),this._setFakeOptions(t)}this.fire("change")}setFocus(e,t){if(null===this.anchor)throw new mo.b("view-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.",this);const o=ei._createAt(e,t);if("same"==o.compareWith(this.focus))return;const n=this.anchor;this._ranges.pop(),"before"==o.compareWith(n)?this._addRange(new ti(o,n),!0):this._addRange(new ti(n,o)),this.fire("change")}is(e){return"selection"===e||"view:selection"===e}_setRanges(e,t=!1){e=Array.from(e),this._ranges=[];for(const t of e)this._addRange(t);this._lastRangeBackward=!!t}_setFakeOptions(e={}){this._isFake=!!e.fake,this._fakeSelectionLabel=e.fake&&e.label||""}_addRange(e,t=!1){if(!(e instanceof ti))throw new mo.b("view-selection-add-range-not-range: Selection range set to an object that is not an instance of view.Range",this);this._pushRange(e),this._lastRangeBackward=!!t}_pushRange(e){for(const t of this._ranges)if(e.isIntersecting(t))throw new mo.b("view-selection-range-intersects: Trying to add a range that intersects with another range from selection.",this,{addedRange:e,intersectingRange:t});this._ranges.push(new ti(e.start,e.end))}}Co(ii,po);class ri{constructor(e=null,t,o){this._selection=new ii,this._selection.delegate("change").to(this),this._selection.setTo(e,t,o)}get isFake(){return this._selection.isFake}get fakeSelectionLabel(){return this._selection.fakeSelectionLabel}get anchor(){return this._selection.anchor}get focus(){return this._selection.focus}get isCollapsed(){return this._selection.isCollapsed}get rangeCount(){return this._selection.rangeCount}get isBackward(){return this._selection.isBackward}get editableElement(){return this._selection.editableElement}get _ranges(){return this._selection._ranges}*getRanges(){yield*this._selection.getRanges()}getFirstRange(){return this._selection.getFirstRange()}getLastRange(){return this._selection.getLastRange()}getFirstPosition(){return this._selection.getFirstPosition()}getLastPosition(){return this._selection.getLastPosition()}getSelectedElement(){return this._selection.getSelectedElement()}isEqual(e){return this._selection.isEqual(e)}isSimilar(e){return this._selection.isSimilar(e)}is(e){return"selection"===e||"documentSelection"==e||"view:selection"==e||"view:documentSelection"==e}_setTo(e,t,o){this._selection.setTo(e,t,o)}_setFocus(e,t){this._selection.setFocus(e,t)}}Co(ri,po);class si{constructor(e){this.selection=new ri,this.roots=new Ao({idProperty:"rootName"}),this.stylesProcessor=e,this.set("isReadOnly",!1),this.set("isFocused",!1),this.set("isComposing",!1),this._postFixers=new Set}getRoot(e="main"){return this.roots.get(e)}registerPostFixer(e){this._postFixers.add(e)}destroy(){this.roots.map(e=>e.destroy()),this.stopListening()}_callPostFixers(e){let t=!1;do{for(const o of this._postFixers)if(t=o(e),t)break}while(t)}}Co(si,qn);class ai extends Nn{constructor(e,t,o,n){super(e,t,o,n),this.getFillerOffset=li,this._priority=10,this._id=null,this._clonesGroup=null}get priority(){return this._priority}get id(){return this._id}getElementsWithSameId(){if(null===this.id)throw new mo.b("attribute-element-get-elements-with-same-id-no-id: Cannot get elements with the same id for an attribute element without id.",this);return new Set(this._clonesGroup)}is(e,t=null){return t?t===this.name&&("attributeElement"===e||"view:attributeElement"===e||"element"===e||"view:element"===e):"attributeElement"===e||"view:attributeElement"===e||"element"===e||"view:element"===e||"node"===e||"view:node"===e}isSimilar(e){return null!==this.id||null!==e.id?this.id===e.id:super.isSimilar(e)&&this.priority==e.priority}_clone(e){const t=super._clone(e);return t._priority=this._priority,t._id=this._id,t}}function li(){if(ci(this))return null;let e=this.parent;for(;e&&e.is("attributeElement");){if(ci(e)>1)return null;e=e.parent}return!e||ci(e)>1?null:this.childCount}function ci(e){return Array.from(e.getChildren()).filter(e=>!e.is("uiElement")).length}ai.DEFAULT_PRIORITY=10;class di extends Nn{constructor(e,t,o,n){super(e,t,o,n),this.getFillerOffset=hi}is(e,t=null){return t?t===this.name&&("emptyElement"===e||"view:emptyElement"===e||"element"===e||"view:element"===e):"emptyElement"===e||"view:emptyElement"===e||"element"===e||"view:element"===e||"node"===e||"view:node"===e}_insertChild(e,t){if(t&&(t instanceof Mo||Array.from(t).length>0))throw new mo.b("view-emptyelement-cannot-add: Cannot add child nodes to EmptyElement instance.",[this,t])}}function hi(){return null}const ui=navigator.userAgent.toLowerCase();var mi={isMac:function(e){return e.indexOf("macintosh")>-1}(ui),isGecko:function(e){return!!e.match(/gecko\/\d+/)}(ui),isSafari:function(e){return e.indexOf(" applewebkit/")>-1&&-1===e.indexOf("chrome")}(ui),isAndroid:function(e){return e.indexOf("android")>-1}(ui),features:{isRegExpUnicodePropertySupported:function(){let e=!1;try{e=0==="ć".search(new RegExp("[\\p{L}]","u"))}catch(e){}return e}()}};const gi={"⌘":"ctrl","⇧":"shift","⌥":"alt"},fi={ctrl:"⌘",shift:"⇧",alt:"⌥"},pi=function(){const e={arrowleft:37,arrowup:38,arrowright:39,arrowdown:40,backspace:8,delete:46,enter:13,space:32,esc:27,tab:9,ctrl:1114112,cmd:1114112,shift:2228224,alt:4456448};for(let t=65;t<=90;t++){const o=String.fromCharCode(t);e[o.toLowerCase()]=t}for(let t=48;t<=57;t++)e[t-48]=t;for(let t=112;t<=123;t++)e["f"+(t-111)]=t;return e}();function bi(e){let t;if("string"==typeof e){if(t=pi[e.toLowerCase()],!t)throw new mo.b("keyboard-unknown-key: Unknown key name.",null,{key:e})}else t=e.keyCode+(e.altKey?pi.alt:0)+(e.ctrlKey?pi.ctrl:0)+(e.shiftKey?pi.shift:0);return t}function wi(e){return"string"==typeof e&&(e=xi(e)),e.map(e=>"string"==typeof e?bi(e):e).reduce((e,t)=>t+e,0)}function ki(e){return mi.isMac?xi(e).map(e=>fi[e.toLowerCase()]||e).reduce((e,t)=>e.slice(-1)in gi?e+t:e+"+"+t):e}function _i(e){return e==pi.arrowright||e==pi.arrowleft||e==pi.arrowup||e==pi.arrowdown}function vi(e,t){const o="ltr"===t;switch(e){case pi.arrowleft:return o?"left":"right";case pi.arrowright:return o?"right":"left";case pi.arrowup:return"up";case pi.arrowdown:return"down"}}function yi(e,t){const o=vi(e,t);return"down"===o||"right"===o}function xi(e){return e.split(/\s*\+\s*/)}class Ci extends Nn{constructor(e,t,o,n){super(e,t,o,n),this.getFillerOffset=Ti}is(e,t=null){return t?t===this.name&&("uiElement"===e||"view:uiElement"===e||"element"===e||"view:element"===e):"uiElement"===e||"view:uiElement"===e||"element"===e||"view:element"===e||"node"===e||"view:node"===e}_insertChild(e,t){if(t&&(t instanceof Mo||Array.from(t).length>0))throw new mo.b("view-uielement-cannot-add: Cannot add child nodes to UIElement instance.",this)}render(e){return this.toDomElement(e)}toDomElement(e){const t=e.createElement(this.name);for(const e of this.getAttributeKeys())t.setAttribute(e,this.getAttribute(e));return t}}function Ai(e){e.document.on("keydown",(t,o)=>function(e,t,o){if(t.keyCode==pi.arrowright){const e=t.domTarget.ownerDocument.defaultView.getSelection(),n=1==e.rangeCount&&e.getRangeAt(0).collapsed;if(n||t.shiftKey){const t=e.focusNode,i=e.focusOffset,r=o.domPositionToView(t,i);if(null===r)return;let s=!1;const a=r.getLastMatchingPosition(e=>(e.item.is("uiElement")&&(s=!0),!(!e.item.is("uiElement")&&!e.item.is("attributeElement"))));if(s){const t=o.viewPositionToDom(a);n?e.collapse(t.parent,t.offset):e.extend(t.parent,t.offset)}}}}(0,o,e.domConverter))}function Ti(){return null}class Pi extends Nn{constructor(e,t,o,n){super(e,t,o,n),this.getFillerOffset=Si}is(e,t=null){return t?t===this.name&&("rawElement"===e||"view:rawElement"===e||"element"===e||"view:element"===e):"rawElement"===e||"view:rawElement"===e||e===this.name||e==="view:"+this.name||"element"===e||"view:element"===e||"node"===e||"view:node"===e}_insertChild(e,t){if(t&&(t instanceof Mo||Array.from(t).length>0))throw new mo.b("view-rawelement-cannot-add: Cannot add child nodes to a RawElement instance.",[this,t])}}function Si(){return null}class Ei{constructor(e,t){this.document=e,this._children=[],t&&this._insertChild(0,t)}[Symbol.iterator](){return this._children[Symbol.iterator]()}get childCount(){return this._children.length}get isEmpty(){return 0===this.childCount}get root(){return this}get parent(){return null}is(e){return"documentFragment"===e||"view:documentFragment"===e}_appendChild(e){return this._insertChild(this.childCount,e)}getChild(e){return this._children[e]}getChildIndex(e){return this._children.indexOf(e)}getChildren(){return this._children[Symbol.iterator]()}_insertChild(e,t){this._fireChange("children",this);let o=0;const n=function(e,t){if("string"==typeof t)return[new No(e,t)];xo(t)||(t=[t]);return Array.from(t).map(t=>"string"==typeof t?new No(e,t):t instanceof zo?new No(e,t.data):t)}(this.document,t);for(const t of n)null!==t.parent&&t._remove(),t.parent=this,this._children.splice(e,0,t),e++,o++;return o}_removeChildren(e,t=1){this._fireChange("children",this);for(let o=e;o{}),n}setAttribute(e,t,o){o._setAttribute(e,t)}removeAttribute(e,t){t._removeAttribute(e)}addClass(e,t){t._addClass(e)}removeClass(e,t){t._removeClass(e)}setStyle(e,t,o){y(e)&&void 0===o&&(o=t),o._setStyle(e,t)}removeStyle(e,t){t._removeStyle(e)}setCustomProperty(e,t,o){o._setCustomProperty(e,t)}removeCustomProperty(e,t){return t._removeCustomProperty(e)}breakAttributes(e){return e instanceof ei?this._breakAttributes(e):this._breakAttributesRange(e)}breakContainer(e){const t=e.parent;if(!t.is("containerElement"))throw new mo.b("view-writer-break-non-container-element: Trying to break an element which is not a container element.",this.document);if(!t.parent)throw new mo.b("view-writer-break-root: Trying to break root element.",this.document);if(e.isAtStart)return ei._createBefore(t);if(!e.isAtEnd){const o=t._clone(!1);this.insert(ei._createAfter(t),o);const n=new ti(e,ei._createAt(t,"end")),i=new ei(o,0);this.move(n,i)}return ei._createAfter(t)}mergeAttributes(e){const t=e.offset,o=e.parent;if(o.is("$text"))return e;if(o.is("attributeElement")&&0===o.childCount){const e=o.parent,t=o.index;return o._remove(),this._removeFromClonedElementsGroup(o),this.mergeAttributes(new ei(e,t))}const n=o.getChild(t-1),i=o.getChild(t);if(!n||!i)return e;if(n.is("$text")&&i.is("$text"))return Ni(n,i);if(n.is("attributeElement")&&i.is("attributeElement")&&n.isSimilar(i)){const e=n.childCount;return n._appendChild(i.getChildren()),i._remove(),this._removeFromClonedElementsGroup(i),this.mergeAttributes(new ei(n,e))}return e}mergeContainers(e){const t=e.nodeBefore,o=e.nodeAfter;if(!(t&&o&&t.is("containerElement")&&o.is("containerElement")))throw new mo.b("view-writer-merge-containers-invalid-position: Element before and after given position cannot be merged.",this.document);const n=t.getChild(t.childCount-1),i=n instanceof No?ei._createAt(n,"end"):ei._createAt(t,"end");return this.move(ti._createIn(o),ei._createAt(t,"end")),this.remove(ti._createOn(o)),i}insert(e,t){(function e(t,o){for(const n of t){if(!zi.some(e=>n instanceof e))throw new mo.b("view-writer-insert-invalid-node-type: One of the nodes to be inserted is of invalid type.",o);n.is("$text")||e(n.getChildren(),o)}})(t=xo(t)?[...t]:[t],this.document);const o=Ii(e);if(!o)throw new mo.b("view-writer-invalid-position-container: Position's parent container cannot be found.",this.document);const n=this._breakAttributes(e,!0),i=o._insertChild(n.offset,t);for(const e of t)this._addToClonedElementsGroup(e);const r=n.getShiftedBy(i),s=this.mergeAttributes(n);if(0===i)return new ti(s,s);{s.isEqual(n)||r.offset--;const e=this.mergeAttributes(r);return new ti(s,e)}}remove(e){const t=e instanceof ti?e:ti._createOn(e);if(Fi(t,this.document),t.isCollapsed)return new Ei(this.document);const{start:o,end:n}=this._breakAttributesRange(t,!0),i=o.parent,r=n.offset-o.offset,s=i._removeChildren(o.offset,r);for(const e of s)this._removeFromClonedElementsGroup(e);const a=this.mergeAttributes(o);return t.start=a,t.end=a.clone(),new Ei(this.document,s)}clear(e,t){Fi(e,this.document);const o=e.getWalker({direction:"backward",ignoreElementEnd:!0});for(const n of o){const o=n.item;let i;if(o.is("element")&&t.isSimilar(o))i=ti._createOn(o);else if(!n.nextPosition.isAfter(e.start)&&o.is("$textProxy")){const e=o.getAncestors().find(e=>e.is("element")&&t.isSimilar(e));e&&(i=ti._createIn(e))}i&&(i.end.isAfter(e.end)&&(i.end=e.end),i.start.isBefore(e.start)&&(i.start=e.start),this.remove(i))}}move(e,t){let o;if(t.isAfter(e.end)){const n=(t=this._breakAttributes(t,!0)).parent,i=n.childCount;e=this._breakAttributesRange(e,!0),o=this.remove(e),t.offset+=n.childCount-i}else o=this.remove(e);return this.insert(t,o)}wrap(e,t){if(!(t instanceof ai))throw new mo.b("view-writer-wrap-invalid-attribute: DowncastWriter#wrap() must be called with an attribute element.",this.document);if(Fi(e,this.document),e.isCollapsed){let n=e.start;n.parent.is("element")&&(o=n.parent,!Array.from(o.getChildren()).some(e=>!e.is("uiElement")))&&(n=n.getLastMatchingPosition(e=>e.item.is("uiElement"))),n=this._wrapPosition(n,t);const i=this.document.selection;return i.isCollapsed&&i.getFirstPosition().isEqual(e.start)&&this.setSelection(n),new ti(n)}return this._wrapRange(e,t);var o}unwrap(e,t){if(!(t instanceof ai))throw new mo.b("view-writer-unwrap-invalid-attribute: DowncastWriter#unwrap() must be called with an attribute element.",this.document);if(Fi(e,this.document),e.isCollapsed)return e;const{start:o,end:n}=this._breakAttributesRange(e,!0),i=o.parent,r=this._unwrapChildren(i,o.offset,n.offset,t),s=this.mergeAttributes(r.start);s.isEqual(r.start)||r.end.offset--;const a=this.mergeAttributes(r.end);return new ti(s,a)}rename(e,t){const o=new Bn(this.document,e,t.getAttributes());return this.insert(ei._createAfter(t),o),this.move(ti._createIn(t),ei._createAt(o,0)),this.remove(ti._createOn(t)),o}clearClonedElementsGroup(e){this._cloneGroups.delete(e)}createPositionAt(e,t){return ei._createAt(e,t)}createPositionAfter(e){return ei._createAfter(e)}createPositionBefore(e){return ei._createBefore(e)}createRange(e,t){return new ti(e,t)}createRangeOn(e){return ti._createOn(e)}createRangeIn(e){return ti._createIn(e)}createSelection(e,t,o){return new ii(e,t,o)}_wrapChildren(e,t,o,n){let i=t;const r=[];for(;i!1,e.parent._insertChild(e.offset,o);const n=new ti(e,e.getShiftedBy(1));this.wrap(n,t);const i=new ei(o.parent,o.index);o._remove();const r=i.nodeBefore,s=i.nodeAfter;return r instanceof No&&s instanceof No?Ni(r,s):Oi(i)}_wrapAttributeElement(e,t){if(!Di(e,t))return!1;if(e.name!==t.name||e.priority!==t.priority)return!1;for(const o of e.getAttributeKeys())if("class"!==o&&"style"!==o&&t.hasAttribute(o)&&t.getAttribute(o)!==e.getAttribute(o))return!1;for(const o of e.getStyleNames())if(t.hasStyle(o)&&t.getStyle(o)!==e.getStyle(o))return!1;for(const o of e.getAttributeKeys())"class"!==o&&"style"!==o&&(t.hasAttribute(o)||this.setAttribute(o,e.getAttribute(o),t));for(const o of e.getStyleNames())t.hasStyle(o)||this.setStyle(o,e.getStyle(o),t);for(const o of e.getClassNames())t.hasClass(o)||this.addClass(o,t);return!0}_unwrapAttributeElement(e,t){if(!Di(e,t))return!1;if(e.name!==t.name||e.priority!==t.priority)return!1;for(const o of e.getAttributeKeys())if("class"!==o&&"style"!==o&&(!t.hasAttribute(o)||t.getAttribute(o)!==e.getAttribute(o)))return!1;if(!t.hasClass(...e.getClassNames()))return!1;for(const o of e.getStyleNames())if(!t.hasStyle(o)||t.getStyle(o)!==e.getStyle(o))return!1;for(const o of e.getAttributeKeys())"class"!==o&&"style"!==o&&this.removeAttribute(o,t);return this.removeClass(Array.from(e.getClassNames()),t),this.removeStyle(Array.from(e.getStyleNames()),t),!0}_breakAttributesRange(e,t=!1){const 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r=[];o>0&&(r=r.concat(Array(o).fill("equal")));i-o>0&&(r=r.concat(Array(i-o).fill("insert")));n-o>0&&(r=r.concat(Array(n-o).fill("delete")));i0&&o.push({index:n,type:"insert",values:e.slice(n,r)});i-n>0&&o.push({index:n+(r-n),type:"delete",howMany:i-n});return o}(t,i)}function Ji(e,t,o){for(let n=0;n200||i>200||n+i>300)return Qi.fastDiff(e,t,o,!0);let r,s;if(ic?-1:1;d[n+u]&&(d[n]=d[n+u].slice(0)),d[n]||(d[n]=[]),d[n].push(i>c?r:s);let m=Math.max(i,c),g=m-n;for(;gc;m--)h[m]=u(m);h[c]=u(c),g++}while(h[c]!==l);return d[c].slice(1)}function Xi(e,t,o){e.insertBefore(o,e.childNodes[t]||null)}function Zi(e){const t=e.parentNode;t&&t.removeChild(e)}function er(e){if(e){if(e.defaultView)return e instanceof e.defaultView.Document;if(e.ownerDocument&&e.ownerDocument.defaultView)return e instanceof e.ownerDocument.defaultView.Node}return!1}Qi.fastDiff=Ki;class tr{constructor(e,t){this.domDocuments=new Set,this.domConverter=e,this.markedAttributes=new Set,this.markedChildren=new Set,this.markedTexts=new Set,this.selection=t,this.isFocused=!1,this._inlineFiller=null,this._fakeSelectionContainer=null}markToSync(e,t){if("text"===e)this.domConverter.mapViewToDom(t.parent)&&this.markedTexts.add(t);else{if(!this.domConverter.mapViewToDom(t))return;if("attributes"===e)this.markedAttributes.add(t);else{if("children"!==e)throw new mo.b("view-renderer-unknown-type: Unknown type passed to Renderer.markToSync.",this);this.markedChildren.add(t)}}}render(){let e;for(const e of this.markedChildren)this._updateChildrenMappings(e);this._inlineFiller&&!this._isSelectionInInlineFiller()&&this._removeInlineFiller(),this._inlineFiller?e=this._getInlineFillerPosition():this._needsInlineFillerAtSelection()&&(e=this.selection.getFirstPosition(),this.markedChildren.add(e.parent));for(const e of this.markedAttributes)this._updateAttrs(e);for(const t of this.markedChildren)this._updateChildren(t,{inlineFillerPosition:e});for(const t of this.markedTexts)!this.markedChildren.has(t.parent)&&this.domConverter.mapViewToDom(t.parent)&&this._updateText(t,{inlineFillerPosition:e});if(e){const t=this.domConverter.viewPositionToDom(e),o=t.parent.ownerDocument;qi(t.parent)?this._inlineFiller=t.parent:this._inlineFiller=or(o,t.parent,t.offset)}else this._inlineFiller=null;this._updateSelection(),this._updateFocus(),this.markedTexts.clear(),this.markedAttributes.clear(),this.markedChildren.clear()}_updateChildrenMappings(e){const t=this.domConverter.mapViewToDom(e);if(!t)return;const o=this.domConverter.mapViewToDom(e).childNodes,n=Array.from(this.domConverter.viewChildrenToDom(e,t.ownerDocument,{withChildren:!1})),i=this._diffNodeLists(o,n),r=this._findReplaceActions(i,o,n);if(-1!==r.indexOf("replace")){const t={equal:0,insert:0,delete:0};for(const i of r)if("replace"===i){const i=t.equal+t.insert,r=t.equal+t.delete,s=e.getChild(i);!s||s.is("uiElement")||s.is("rawElement")||this._updateElementMappings(s,o[r]),Zi(n[i]),t.equal++}else t[i]++}}_updateElementMappings(e,t){this.domConverter.unbindDomElement(t),this.domConverter.bindElements(t,e),this.markedChildren.add(e),this.markedAttributes.add(e)}_getInlineFillerPosition(){const e=this.selection.getFirstPosition();return e.parent.is("$text")?ei._createBefore(this.selection.getFirstPosition().parent):e}_isSelectionInInlineFiller(){if(1!=this.selection.rangeCount||!this.selection.isCollapsed)return!1;const e=this.selection.getFirstPosition(),t=this.domConverter.viewPositionToDom(e);return!!(t&&Li(t.parent)&&qi(t.parent))}_removeInlineFiller(){const e=this._inlineFiller;if(!qi(e))throw new mo.b("view-renderer-filler-was-lost: The inline filler node was lost.",this);$i(e)?e.parentNode.removeChild(e):e.data=e.data.substr(7),this._inlineFiller=null}_needsInlineFillerAtSelection(){if(1!=this.selection.rangeCount||!this.selection.isCollapsed)return!1;const e=this.selection.getFirstPosition(),t=e.parent,o=e.offset;if(!this.domConverter.mapViewToDom(t.root))return!1;if(!t.is("element"))return!1;if(!function(e){if("false"==e.getAttribute("contenteditable"))return!1;const t=e.findAncestor(e=>e.hasAttribute("contenteditable"));return!t||"true"==t.getAttribute("contenteditable")}(t))return!1;if(o===t.getFillerOffset())return!1;const n=e.nodeBefore,i=e.nodeAfter;return!(n instanceof No||i instanceof No)}_updateText(e,t){const o=this.domConverter.findCorrespondingDomText(e),n=this.domConverter.viewToDom(e,o.ownerDocument),i=o.data;let r=n.data;const s=t.inlineFillerPosition;if(s&&s.parent==e.parent&&s.offset==e.index&&(r=Wi+r),i!=r){const e=Ki(i,r);for(const t of e)"insert"===t.type?o.insertData(t.index,t.values.join("")):o.deleteData(t.index,t.howMany)}}_updateAttrs(e){const t=this.domConverter.mapViewToDom(e);if(!t)return;const o=Array.from(t.attributes).map(e=>e.name),n=e.getAttributeKeys();for(const o of n)t.setAttribute(o,e.getAttribute(o));for(const n of o)e.hasAttribute(n)||t.removeAttribute(n)}_updateChildren(e,t){const o=this.domConverter.mapViewToDom(e);if(!o)return;const n=t.inlineFillerPosition,i=this.domConverter.mapViewToDom(e).childNodes,r=Array.from(this.domConverter.viewChildrenToDom(e,o.ownerDocument,{bind:!0,inlineFillerPosition:n}));n&&n.parent===e&&or(o.ownerDocument,r,n.offset);const s=this._diffNodeLists(i,r);let a=0;const l=new Set;for(const e of s)"delete"===e?(l.add(i[a]),Zi(i[a])):"equal"===e&&a++;a=0;for(const e of s)"insert"===e?(Xi(o,a,r[a]),a++):"equal"===e&&(this._markDescendantTextToSync(this.domConverter.domToView(r[a])),a++);for(const e of l)e.parentNode||this.domConverter.unbindDomElement(e)}_diffNodeLists(e,t){return Qi(e=function(e,t){const o=Array.from(e);if(0==o.length||!t)return o;o[o.length-1]==t&&o.pop();return o}(e,this._fakeSelectionContainer),t,ir.bind(null,this.domConverter))}_findReplaceActions(e,t,o){if(-1===e.indexOf("insert")||-1===e.indexOf("delete"))return e;let n=[],i=[],r=[];const s={equal:0,insert:0,delete:0};for(const a of e)"insert"===a?r.push(o[s.equal+s.insert]):"delete"===a?i.push(t[s.equal+s.delete]):(n=n.concat(Qi(i,r,nr).map(e=>"equal"===e?"replace":e)),n.push("equal"),i=[],r=[]),s[a]++;return n.concat(Qi(i,r,nr).map(e=>"equal"===e?"replace":e))}_markDescendantTextToSync(e){if(e)if(e.is("$text"))this.markedTexts.add(e);else if(e.is("element"))for(const t of e.getChildren())this._markDescendantTextToSync(t)}_updateSelection(){if(0===this.selection.rangeCount)return this._removeDomSelection(),void this._removeFakeSelection();const e=this.domConverter.mapViewToDom(this.selection.editableElement);this.isFocused&&e&&(this.selection.isFake?this._updateFakeSelection(e):(this._removeFakeSelection(),this._updateDomSelection(e)))}_updateFakeSelection(e){const t=e.ownerDocument;this._fakeSelectionContainer||(this._fakeSelectionContainer=function(e){const t=e.createElement("div");return Object.assign(t.style,{position:"fixed",top:0,left:"-9999px",width:"42px"}),t.textContent=" ",t}(t));const o=this._fakeSelectionContainer;if(this.domConverter.bindFakeSelection(o,this.selection),!this._fakeSelectionNeedsUpdate(e))return;o.parentElement&&o.parentElement==e||e.appendChild(o),o.textContent=this.selection.fakeSelectionLabel||" ";const n=t.getSelection(),i=t.createRange();n.removeAllRanges(),i.selectNodeContents(o),n.addRange(i)}_updateDomSelection(e){const t=e.ownerDocument.defaultView.getSelection();if(!this._domSelectionNeedsUpdate(t))return;const o=this.domConverter.viewPositionToDom(this.selection.anchor),n=this.domConverter.viewPositionToDom(this.selection.focus);e.focus(),t.collapse(o.parent,o.offset),t.extend(n.parent,n.offset),mi.isGecko&&function(e,t){const o=e.parent;if(o.nodeType!=Node.ELEMENT_NODE||e.offset!=o.childNodes.length-1)return;const n=o.childNodes[e.offset];n&&"BR"==n.tagName&&t.addRange(t.getRangeAt(0))}(n,t)}_domSelectionNeedsUpdate(e){if(!this.domConverter.isDomSelectionCorrect(e))return!0;const t=e&&this.domConverter.domSelectionToView(e);return(!t||!this.selection.isEqual(t))&&!(!this.selection.isCollapsed&&this.selection.isSimilar(t))}_fakeSelectionNeedsUpdate(e){const t=this._fakeSelectionContainer,o=e.ownerDocument.getSelection();return!t||t.parentElement!==e||(o.anchorNode!==t&&!t.contains(o.anchorNode)||t.textContent!==this.selection.fakeSelectionLabel)}_removeDomSelection(){for(const e of this.domDocuments){if(e.getSelection().rangeCount){const t=e.activeElement,o=this.domConverter.mapDomToView(t);t&&o&&e.getSelection().removeAllRanges()}}}_removeFakeSelection(){const e=this._fakeSelectionContainer;e&&e.remove()}_updateFocus(){if(this.isFocused){const e=this.selection.editableElement;e&&this.domConverter.focus(e)}}}function or(e,t,o){const n=t instanceof Array?t:t.childNodes,i=n[o];if(Li(i))return i.data=Wi+i.data,i;{const i=e.createTextNode(Wi);return Array.isArray(t)?n.splice(o,0,i):Xi(t,o,i),i}}function nr(e,t){return er(e)&&er(t)&&!Li(e)&&!Li(t)&&e.nodeType!==Node.COMMENT_NODE&&t.nodeType!==Node.COMMENT_NODE&&e.tagName.toLowerCase()===t.tagName.toLowerCase()}function ir(e,t,o){return t===o||(Li(t)&&Li(o)?t.data===o.data:!(!e.isBlockFiller(t)||!e.isBlockFiller(o)))}Co(tr,qn);var rr={window:window,document:document};function sr(e){let t=0;for(;e.previousSibling;)e=e.previousSibling,t++;return t}function ar(e){const t=[];for(;e&&e.nodeType!=Node.DOCUMENT_NODE;)t.unshift(e),e=e.parentNode;return t}const lr=ji(document);class cr{constructor(e,t={}){this.document=e,this.blockFillerMode=t.blockFillerMode||"br",this.preElements=["pre"],this.blockElements=["p","div","h1","h2","h3","h4","h5","h6","li","dd","dt","figcaption","td","th"],this._blockFiller="br"==this.blockFillerMode?ji:Hi,this._domToViewMapping=new WeakMap,this._viewToDomMapping=new WeakMap,this._fakeSelectionMapping=new WeakMap}bindFakeSelection(e,t){this._fakeSelectionMapping.set(e,new ii(t))}fakeSelectionToView(e){return this._fakeSelectionMapping.get(e)}bindElements(e,t){this._domToViewMapping.set(e,t),this._viewToDomMapping.set(t,e)}unbindDomElement(e){const t=this._domToViewMapping.get(e);if(t){this._domToViewMapping.delete(e),this._viewToDomMapping.delete(t);for(const t of e.childNodes)this.unbindDomElement(t)}}bindDocumentFragments(e,t){this._domToViewMapping.set(e,t),this._viewToDomMapping.set(t,e)}viewToDom(e,t,o={}){if(e.is("$text")){const o=this._processDataFromViewText(e);return t.createTextNode(o)}{if(this.mapViewToDom(e))return this.mapViewToDom(e);let n;if(e.is("documentFragment"))n=t.createDocumentFragment(),o.bind&&this.bindDocumentFragments(n,e);else{if(e.is("uiElement"))return n=e.render(t),o.bind&&this.bindElements(n,e),n;n=e.hasAttribute("xmlns")?t.createElementNS(e.getAttribute("xmlns"),e.name):t.createElement(e.name),e.is("rawElement")&&e.render(n),o.bind&&this.bindElements(n,e);for(const t of e.getAttributeKeys())n.setAttribute(t,e.getAttribute(t))}if(o.withChildren||void 0===o.withChildren)for(const i of this.viewChildrenToDom(e,t,o))n.appendChild(i);return n}}*viewChildrenToDom(e,t,o={}){const n=e.getFillerOffset&&e.getFillerOffset();let i=0;for(const r of e.getChildren())n===i&&(yield this._blockFiller(t)),yield this.viewToDom(r,t,o),i++;n===i&&(yield this._blockFiller(t))}viewRangeToDom(e){const t=this.viewPositionToDom(e.start),o=this.viewPositionToDom(e.end),n=document.createRange();return n.setStart(t.parent,t.offset),n.setEnd(o.parent,o.offset),n}viewPositionToDom(e){const t=e.parent;if(t.is("$text")){const o=this.findCorrespondingDomText(t);if(!o)return null;let n=e.offset;return qi(o)&&(n+=7),{parent:o,offset:n}}{let o,n,i;if(0===e.offset){if(o=this.mapViewToDom(t),!o)return null;i=o.childNodes[0]}else{const t=e.nodeBefore;if(n=t.is("$text")?this.findCorrespondingDomText(t):this.mapViewToDom(e.nodeBefore),!n)return null;o=n.parentNode,i=n.nextSibling}if(Li(i)&&qi(i))return{parent:i,offset:7};return{parent:o,offset:n?sr(n)+1:0}}}domToView(e,t={}){if(this.isBlockFiller(e,this.blockFillerMode))return null;const o=this.getHostViewElement(e,this._domToViewMapping);if(o)return o;if(Li(e)){if($i(e))return null;{const t=this._processDataFromDomText(e);return""===t?null:new No(this.document,t)}}if(this.isComment(e))return null;{if(this.mapDomToView(e))return this.mapDomToView(e);let o;if(this.isDocumentFragment(e))o=new Ei(this.document),t.bind&&this.bindDocumentFragments(e,o);else{const n=t.keepOriginalCase?e.tagName:e.tagName.toLowerCase();o=new Nn(this.document,n),t.bind&&this.bindElements(e,o);const i=e.attributes;for(let e=i.length-1;e>=0;e--)o._setAttribute(i[e].name,i[e].value)}if(t.withChildren||void 0===t.withChildren)for(const n of this.domChildrenToView(e,t))o._appendChild(n);return o}}*domChildrenToView(e,t={}){for(let o=0;o{const{scrollLeft:t,scrollTop:o}=e;n.push([t,o])}),t.focus(),hr(t,e=>{const[t,o]=n.shift();e.scrollLeft=t,e.scrollTop=o}),rr.window.scrollTo(e,o)}}isElement(e){return e&&e.nodeType==Node.ELEMENT_NODE}isDocumentFragment(e){return e&&e.nodeType==Node.DOCUMENT_FRAGMENT_NODE}isComment(e){return e&&e.nodeType==Node.COMMENT_NODE}isBlockFiller(e){return"br"==this.blockFillerMode?e.isEqualNode(lr):!("BR"!==e.tagName||!ur(e,this.blockElements)||1!==e.parentNode.childNodes.length)||function(e,t){return Li(e)&&" "==e.data&&ur(e,t)&&1===e.parentNode.childNodes.length}(e,this.blockElements)}isDomSelectionBackward(e){if(e.isCollapsed)return!1;const t=document.createRange();t.setStart(e.anchorNode,e.anchorOffset),t.setEnd(e.focusNode,e.focusOffset);const o=t.collapsed;return t.detach(),o}getHostViewElement(e){const t=ar(e);for(t.pop();t.length;){const e=t.pop(),o=this._domToViewMapping.get(e);if(o&&(o.is("uiElement")||o.is("rawElement")))return o}return null}isDomSelectionCorrect(e){return this._isDomSelectionPositionCorrect(e.anchorNode,e.anchorOffset)&&this._isDomSelectionPositionCorrect(e.focusNode,e.focusOffset)}_isDomSelectionPositionCorrect(e,t){if(Li(e)&&qi(e)&&t<7)return!1;if(this.isElement(e)&&qi(e.childNodes[t]))return!1;const o=this.mapDomToView(e);return!o||!o.is("uiElement")&&!o.is("rawElement")}_processDataFromViewText(e){let t=e.data;if(e.getAncestors().some(e=>this.preElements.includes(e.name)))return t;if(" "==t.charAt(0)){const o=this._getTouchingViewTextNode(e,!1);!(o&&this._nodeEndsWithSpace(o))&&o||(t=" "+t.substr(1))}if(" "==t.charAt(t.length-1)){const o=this._getTouchingViewTextNode(e,!0);" "!=t.charAt(t.length-2)&&o&&" "!=o.data.charAt(0)||(t=t.substr(0,t.length-1)+" ")}return t.replace(/ {2}/g," ")}_nodeEndsWithSpace(e){if(e.getAncestors().some(e=>this.preElements.includes(e.name)))return!1;const t=this._processDataFromViewText(e);return" "==t.charAt(t.length-1)}_processDataFromDomText(e){let t=e.data;if(dr(e,this.preElements))return Ui(e);t=t.replace(/[ \n\t\r]{1,}/g," ");const o=this._getTouchingInlineDomNode(e,!1),n=this._getTouchingInlineDomNode(e,!0),i=this._checkShouldLeftTrimDomText(o),r=this._checkShouldRightTrimDomText(e,n);return i&&(t=t.replace(/^ /,"")),r&&(t=t.replace(/ $/,"")),t=Ui(new Text(t)),t=t.replace(/ \u00A0/g," "),(/( |\u00A0)\u00A0$/.test(t)||!n||n.data&&" "==n.data.charAt(0))&&(t=t.replace(/\u00A0$/," ")),i&&(t=t.replace(/^\u00A0/," ")),t}_checkShouldLeftTrimDomText(e){return!e||(!!no(e)||/[^\S\u00A0]/.test(e.data.charAt(e.data.length-1)))}_checkShouldRightTrimDomText(e,t){return!t&&!qi(e)}_getTouchingViewTextNode(e,t){const o=new Zn({startPosition:t?ei._createAfter(e):ei._createBefore(e),direction:t?"forward":"backward"});for(const e of o){if(e.item.is("containerElement"))return null;if(e.item.is("element","br"))return null;if(e.item.is("$textProxy"))return e.item}return null}_getTouchingInlineDomNode(e,t){if(!e.parentNode)return null;const o=t?"nextNode":"previousNode",n=e.ownerDocument,i=ar(e)[0],r=n.createTreeWalker(i,NodeFilter.SHOW_TEXT|NodeFilter.SHOW_ELEMENT,{acceptNode:e=>Li(e)||"BR"==e.tagName?NodeFilter.FILTER_ACCEPT:NodeFilter.FILTER_SKIP});r.currentNode=e;const s=r[o]();if(null!==s){const t=function(e,t){const o=ar(e),n=ar(t);let i=0;for(;o[i]==n[i]&&o[i];)i++;return 0===i?null:o[i-1]}(e,s);if(t&&!dr(e,this.blockElements,t)&&!dr(s,this.blockElements,t))return s}return null}}function dr(e,t,o){let n=ar(e);return o&&(n=n.slice(n.indexOf(o)+1)),n.some(e=>e.tagName&&t.includes(e.tagName.toLowerCase()))}function hr(e,t){for(;e&&e!=rr.document;)t(e),e=e.parentNode}function ur(e,t){const o=e.parentNode;return o&&o.tagName&&t.includes(o.tagName.toLowerCase())}function mr(e){const t=Object.prototype.toString.apply(e);return"[object Window]"==t||"[object global]"==t}var gr=Dn({},po,{listenTo(e,...t){if(er(e)||mr(e)){const o=this._getProxyEmitter(e)||new fr(e);o.attach(...t),e=o}po.listenTo.call(this,e,...t)},stopListening(e,t,o){if(er(e)||mr(e)){const t=this._getProxyEmitter(e);if(!t)return;e=t}po.stopListening.call(this,e,t,o),e instanceof fr&&e.detach(t)},_getProxyEmitter(e){return t=this,o=pr(e),t[go]&&t[go][o]?t[go][o].emitter:null;var t,o}});class fr{constructor(e){bo(this,pr(e)),this._domNode=e}}function pr(e){return e["data-ck-expando"]||(e["data-ck-expando"]=ho())}Dn(fr.prototype,po,{attach(e,t,o={}){if(this._domListeners&&this._domListeners[e])return;const n={capture:!!o.useCapture,passive:!!o.usePassive},i=this._createDomListener(e,n);this._domNode.addEventListener(e,i,n),this._domListeners||(this._domListeners={}),this._domListeners[e]=i},detach(e){let t;!this._domListeners[e]||(t=this._events[e])&&t.callbacks.length||this._domListeners[e].removeListener()},_createDomListener(e,t){const o=t=>{this.fire(e,t)};return o.removeListener=()=>{this._domNode.removeEventListener(e,o,t),delete this._domListeners[e]},o}});class br{constructor(e){this.view=e,this.document=e.document,this.isEnabled=!1}enable(){this.isEnabled=!0}disable(){this.isEnabled=!1}destroy(){this.disable(),this.stopListening()}}Co(br,gr);var wr=function(e){return this.__data__.set(e,"__lodash_hash_undefined__"),this};var kr=function(e){return this.__data__.has(e)};function _r(e){var t=-1,o=null==e?0:e.length;for(this.__data__=new _e;++ta))return!1;var c=r.get(e);if(c&&r.get(t))return c==t;var d=-1,h=!0,u=2&o?new vr:void 0;for(r.set(e,t),r.set(t,e);++d{this.listenTo(e,t,(e,t)=>{this.isEnabled&&this.onDomEvent(t)},{useCapture:this.useCapture})})}fire(e,t,o){this.isEnabled&&this.document.fire(e,new Br(this.view,t,o))}}class Dr extends Fr{constructor(e){super(e),this.domEventType=["keydown","keyup"]}onDomEvent(e){this.fire(e.type,e,{keyCode:e.keyCode,altKey:e.altKey,ctrlKey:e.ctrlKey||e.metaKey,shiftKey:e.shiftKey,get keystroke(){return bi(this)}})}}var Lr=function(){return n.a.Date.now()},Hr=/^\s+|\s+$/g,jr=/^[-+]0x[0-9a-f]+$/i,Wr=/^0b[01]+$/i,qr=/^0o[0-7]+$/i,$r=parseInt;var Ur=function(e){if("number"==typeof e)return e;if(Lo(e))return NaN;if(B(e)){var t="function"==typeof e.valueOf?e.valueOf():e;e=B(t)?t+"":t}if("string"!=typeof e)return 0===e?e:+e;e=e.replace(Hr,"");var o=Wr.test(e);return o||qr.test(e)?$r(e.slice(2),o?2:8):jr.test(e)?NaN:+e},Gr=Math.max,Kr=Math.min;var Jr=function(e,t,o){var n,i,r,s,a,l,c=0,d=!1,h=!1,u=!0;if("function"!=typeof e)throw new TypeError("Expected a function");function m(t){var o=n,r=i;return n=i=void 0,c=t,s=e.apply(r,o)}function g(e){return c=e,a=setTimeout(p,t),d?m(e):s}function f(e){var o=e-l;return void 0===l||o>=t||o<0||h&&e-c>=r}function p(){var e=Lr();if(f(e))return b(e);a=setTimeout(p,function(e){var o=t-(e-l);return h?Kr(o,r-(e-c)):o}(e))}function b(e){return a=void 0,u&&n?m(e):(n=i=void 0,s)}function w(){var e=Lr(),o=f(e);if(n=arguments,i=this,l=e,o){if(void 0===a)return g(l);if(h)return clearTimeout(a),a=setTimeout(p,t),m(l)}return void 0===a&&(a=setTimeout(p,t)),s}return t=Ur(t)||0,B(o)&&(d=!!o.leading,r=(h="maxWait"in o)?Gr(Ur(o.maxWait)||0,t):r,u="trailing"in o?!!o.trailing:u),w.cancel=function(){void 0!==a&&clearTimeout(a),c=0,n=l=i=a=void 0},w.flush=function(){return void 0===a?s:b(Lr())},w};class Yr extends br{constructor(e){super(e),this._fireSelectionChangeDoneDebounced=Jr(e=>this.document.fire("selectionChangeDone",e),200)}observe(){const e=this.document;e.on("keydown",(t,o)=>{var n;e.selection.isFake&&((n=o.keyCode)==pi.arrowright||n==pi.arrowleft||n==pi.arrowup||n==pi.arrowdown)&&this.isEnabled&&(o.preventDefault(),this._handleSelectionMove(o.keyCode))},{priority:"lowest"})}destroy(){super.destroy(),this._fireSelectionChangeDoneDebounced.cancel()}_handleSelectionMove(e){const t=this.document.selection,o=new ii(t.getRanges(),{backward:t.isBackward,fake:!1});e!=pi.arrowleft&&e!=pi.arrowup||o.setTo(o.getFirstPosition()),e!=pi.arrowright&&e!=pi.arrowdown||o.setTo(o.getLastPosition());const n={oldSelection:t,newSelection:o,domSelection:null};this.document.fire("selectionChange",n),this._fireSelectionChangeDoneDebounced(n)}}class Qr extends br{constructor(e){super(e),this.mutationObserver=e.getObserver(zr),this.selection=this.document.selection,this.domConverter=e.domConverter,this._documents=new WeakSet,this._fireSelectionChangeDoneDebounced=Jr(e=>this.document.fire("selectionChangeDone",e),200),this._clearInfiniteLoopInterval=setInterval(()=>this._clearInfiniteLoop(),1e3),this._loopbackCounter=0}observe(e){const t=e.ownerDocument;this._documents.has(t)||(this.listenTo(t,"selectionchange",()=>{this._handleSelectionChange(t)}),this._documents.add(t))}destroy(){super.destroy(),clearInterval(this._clearInfiniteLoopInterval),this._fireSelectionChangeDoneDebounced.cancel()}_handleSelectionChange(e){if(!this.isEnabled)return;this.mutationObserver.flush();const t=e.defaultView.getSelection(),o=this.domConverter.domSelectionToView(t);if(0!=o.rangeCount){if(this.view.hasDomSelection=!0,!(this.selection.isEqual(o)&&this.domConverter.isDomSelectionCorrect(t)||++this._loopbackCounter>60))if(this.selection.isSimilar(o))this.view.forceRender();else{const e={oldSelection:this.selection,newSelection:o,domSelection:t};this.document.fire("selectionChange",e),this._fireSelectionChangeDoneDebounced(e)}}else this.view.hasDomSelection=!1}_clearInfiniteLoop(){this._loopbackCounter=0}}class Xr extends Fr{constructor(e){super(e),this.domEventType=["focus","blur"],this.useCapture=!0;const t=this.document;t.on("focus",()=>{t.isFocused=!0,this._renderTimeoutId=setTimeout(()=>e.forceRender(),50)}),t.on("blur",(o,n)=>{const i=t.selection.editableElement;null!==i&&i!==n.target||(t.isFocused=!1,e.forceRender())})}onDomEvent(e){this.fire(e.type,e)}destroy(){this._renderTimeoutId&&clearTimeout(this._renderTimeoutId),super.destroy()}}class Zr extends Fr{constructor(e){super(e),this.domEventType=["compositionstart","compositionupdate","compositionend"];const t=this.document;t.on("compositionstart",()=>{t.isComposing=!0}),t.on("compositionend",()=>{t.isComposing=!1})}onDomEvent(e){this.fire(e.type,e)}}class es extends Fr{constructor(e){super(e),this.domEventType=["beforeinput"]}onDomEvent(e){this.fire(e.type,e)}}function ts(e){return"[object Range]"==Object.prototype.toString.apply(e)}function os(e){const t=e.ownerDocument.defaultView.getComputedStyle(e);return{top:parseInt(t.borderTopWidth,10),right:parseInt(t.borderRightWidth,10),bottom:parseInt(t.borderBottomWidth,10),left:parseInt(t.borderLeftWidth,10)}}const ns=["top","right","bottom","left","width","height"];class is{constructor(e){const t=ts(e);if(Object.defineProperty(this,"_source",{value:e._source||e,writable:!0,enumerable:!1}),no(e)||t)if(t){const t=is.getDomRangeRects(e);rs(this,is.getBoundingRect(t))}else rs(this,e.getBoundingClientRect());else if(mr(e)){const{innerWidth:t,innerHeight:o}=e;rs(this,{top:0,right:t,bottom:o,left:0,width:t,height:o})}else rs(this,e)}clone(){return new is(this)}moveTo(e,t){return this.top=t,this.right=e+this.width,this.bottom=t+this.height,this.left=e,this}moveBy(e,t){return this.top+=t,this.right+=e,this.left+=e,this.bottom+=t,this}getIntersection(e){const t={top:Math.max(this.top,e.top),right:Math.min(this.right,e.right),bottom:Math.min(this.bottom,e.bottom),left:Math.max(this.left,e.left)};return t.width=t.right-t.left,t.height=t.bottom-t.top,t.width<0||t.height<0?null:new is(t)}getIntersectionArea(e){const t=this.getIntersection(e);return t?t.getArea():0}getArea(){return this.width*this.height}getVisible(){const e=this._source;let t=this.clone();if(!ss(e)){let o=e.parentNode||e.commonAncestorContainer;for(;o&&!ss(o);){const e=new is(o),n=t.getIntersection(e);if(!n)return null;n.getArea()ps(e,n));const s=ps(e,n);if(ls(n,s,t),n.parent!=n){if(i=n.frameElement,n=n.parent,!i)return}else n=null}}function ls(e,t,o){const n=t.clone().moveBy(0,o),i=t.clone().moveBy(0,-o),r=new is(e).excludeScrollbarsAndBorders();if(![i,n].every(e=>r.contains(e))){let{scrollX:s,scrollY:a}=e;hs(i,r)?a-=r.top-t.top+o:ds(n,r)&&(a+=t.bottom-r.bottom+o),us(t,r)?s-=r.left-t.left+o:ms(t,r)&&(s+=t.right-r.right+o),e.scrollTo(s,a)}}function cs(e,t){const o=gs(e);let n,i;for(;e!=o.document.body;)i=t(),n=new is(e).excludeScrollbarsAndBorders(),n.contains(i)||(hs(i,n)?e.scrollTop-=n.top-i.top:ds(i,n)&&(e.scrollTop+=i.bottom-n.bottom),us(i,n)?e.scrollLeft-=n.left-i.left:ms(i,n)&&(e.scrollLeft+=i.right-n.right)),e=e.parentNode}function ds(e,t){return e.bottom>t.bottom}function hs(e,t){return e.topt.right}function gs(e){return ts(e)?e.startContainer.ownerDocument.defaultView:e.ownerDocument.defaultView}function fs(e){if(ts(e)){let t=e.commonAncestorContainer;return Li(t)&&(t=t.parentNode),t}return e.parentNode}function ps(e,t){const o=gs(e),n=new is(e);if(o===t)return n;{let e=o;for(;e!=t;){const t=e.frameElement,o=new is(t).excludeScrollbarsAndBorders();n.moveBy(o.left,o.top),e=e.parent}}return n}Object.assign({},{scrollViewportToShowTarget:as,scrollAncestorsToShowTarget:function(e){cs(fs(e),()=>new is(e))}});class bs{constructor(e){this.document=new si(e),this.domConverter=new cr(this.document),this.domRoots=new Map,this.set("isRenderingInProgress",!1),this.set("hasDomSelection",!1),this._renderer=new tr(this.domConverter,this.document.selection),this._renderer.bind("isFocused").to(this.document),this._initialDomRootAttributes=new WeakMap,this._observers=new Map,this._ongoingChange=!1,this._postFixersInProgress=!1,this._renderingDisabled=!1,this._hasChangedSinceTheLastRendering=!1,this._writer=new Ri(this.document),this.addObserver(zr),this.addObserver(Qr),this.addObserver(Xr),this.addObserver(Dr),this.addObserver(Yr),this.addObserver(Zr),mi.isAndroid&&this.addObserver(es),this.document.on("keydown",Gi),Ai(this),this.on("render",()=>{this._render(),this.document.fire("layoutChanged"),this._hasChangedSinceTheLastRendering=!1}),this.listenTo(this.document.selection,"change",()=>{this._hasChangedSinceTheLastRendering=!0})}attachDomRoot(e,t="main"){const o=this.document.getRoot(t);o._name=e.tagName.toLowerCase();const n={};for(const{name:t,value:i}of Array.from(e.attributes))n[t]=i,"class"===t?this._writer.addClass(i.split(" "),o):this._writer.setAttribute(t,i,o);this._initialDomRootAttributes.set(e,n);const i=()=>{this._writer.setAttribute("contenteditable",!o.isReadOnly,o),o.isReadOnly?this._writer.addClass("ck-read-only",o):this._writer.removeClass("ck-read-only",o)};i(),this.domRoots.set(t,e),this.domConverter.bindElements(e,o),this._renderer.markToSync("children",o),this._renderer.markToSync("attributes",o),this._renderer.domDocuments.add(e.ownerDocument),o.on("change:children",(e,t)=>this._renderer.markToSync("children",t)),o.on("change:attributes",(e,t)=>this._renderer.markToSync("attributes",t)),o.on("change:text",(e,t)=>this._renderer.markToSync("text",t)),o.on("change:isReadOnly",()=>this.change(i)),o.on("change",()=>{this._hasChangedSinceTheLastRendering=!0});for(const o of this._observers.values())o.observe(e,t)}detachDomRoot(e){const t=this.domRoots.get(e);Array.from(t.attributes).forEach(({name:e})=>t.removeAttribute(e));const o=this._initialDomRootAttributes.get(t);for(const e in o)t.setAttribute(e,o[e]);this.domRoots.delete(e),this.domConverter.unbindDomElement(t)}getDomRoot(e="main"){return this.domRoots.get(e)}addObserver(e){let t=this._observers.get(e);if(t)return t;t=new e(this),this._observers.set(e,t);for(const[e,o]of this.domRoots)t.observe(o,e);return t.enable(),t}getObserver(e){return this._observers.get(e)}disableObservers(){for(const e of this._observers.values())e.disable()}enableObservers(){for(const e of this._observers.values())e.enable()}scrollToTheSelection(){const e=this.document.selection.getFirstRange();e&&as({target:this.domConverter.viewRangeToDom(e),viewportOffset:20})}focus(){if(!this.document.isFocused){const e=this.document.selection.editableElement;e&&(this.domConverter.focus(e),this.forceRender())}}change(e){if(this.isRenderingInProgress||this._postFixersInProgress)throw new mo.b("cannot-change-view-tree: Attempting to make changes to the view when it is in an incorrect state: rendering or post-fixers are in progress. This may cause some unexpected behavior and inconsistency between the DOM and the view.",this);try{if(this._ongoingChange)return e(this._writer);this._ongoingChange=!0;const t=e(this._writer);return this._ongoingChange=!1,!this._renderingDisabled&&this._hasChangedSinceTheLastRendering&&(this._postFixersInProgress=!0,this.document._callPostFixers(this._writer),this._postFixersInProgress=!1,this.fire("render")),t}catch(e){mo.b.rethrowUnexpectedError(e,this)}}forceRender(){this._hasChangedSinceTheLastRendering=!0,this.change(()=>{})}destroy(){for(const e of this._observers.values())e.destroy();this.document.destroy(),this.stopListening()}createPositionAt(e,t){return ei._createAt(e,t)}createPositionAfter(e){return ei._createAfter(e)}createPositionBefore(e){return ei._createBefore(e)}createRange(e,t){return new ti(e,t)}createRangeOn(e){return ti._createOn(e)}createRangeIn(e){return ti._createIn(e)}createSelection(e,t,o){return new ii(e,t,o)}_disableRendering(e){this._renderingDisabled=e,0==e&&this.change(()=>{})}_render(){this.isRenderingInProgress=!0,this.disableObservers(),this._renderer.render(),this.enableObservers(),this.isRenderingInProgress=!1}}Co(bs,qn);class ws{constructor(e){this.parent=null,this._attrs=Bo(e)}get index(){let e;if(!this.parent)return null;if(null===(e=this.parent.getChildIndex(this)))throw new mo.b("model-node-not-found-in-parent: The node's parent does not contain this node.",this);return e}get startOffset(){let e;if(!this.parent)return null;if(null===(e=this.parent.getChildStartOffset(this)))throw new mo.b("model-node-not-found-in-parent: The node's parent does not contain this node.",this);return e}get offsetSize(){return 1}get endOffset(){return this.parent?this.startOffset+this.offsetSize:null}get nextSibling(){const e=this.index;return null!==e&&this.parent.getChild(e+1)||null}get previousSibling(){const e=this.index;return null!==e&&this.parent.getChild(e-1)||null}get root(){let e=this;for(;e.parent;)e=e.parent;return e}isAttached(){return this.root.is("rootElement")}getPath(){const e=[];let t=this;for(;t.parent;)e.unshift(t.startOffset),t=t.parent;return e}getAncestors(e={includeSelf:!1,parentFirst:!1}){const t=[];let o=e.includeSelf?this:this.parent;for(;o;)t[e.parentFirst?"push":"unshift"](o),o=o.parent;return t}getCommonAncestor(e,t={}){const o=this.getAncestors(t),n=e.getAncestors(t);let i=0;for(;o[i]==n[i]&&o[i];)i++;return 0===i?null:o[i-1]}isBefore(e){if(this==e)return!1;if(this.root!==e.root)return!1;const t=this.getPath(),o=e.getPath(),n=Vo(t,o);switch(n){case"prefix":return!0;case"extension":return!1;default:return t[n](e[t[0]]=t[1],e),{})),e}is(e){return"node"===e||"model:node"===e}_clone(){return new ws(this._attrs)}_remove(){this.parent._removeChildren(this.index)}_setAttribute(e,t){this._attrs.set(e,t)}_setAttributesTo(e){this._attrs=Bo(e)}_removeAttribute(e){return this._attrs.delete(e)}_clearAttributes(){this._attrs.clear()}}class ks extends ws{constructor(e,t){super(t),this._data=e||""}get offsetSize(){return this.data.length}get data(){return this._data}is(e){return"$text"===e||"model:$text"===e||"text"===e||"model:text"===e||"node"===e||"model:node"===e}toJSON(){const e=super.toJSON();return e.data=this.data,e}_clone(){return new ks(this.data,this.getAttributes())}static fromJSON(e){return new ks(e.data,e.attributes)}}class _s{constructor(e,t,o){if(this.textNode=e,t<0||t>e.offsetSize)throw new mo.b("model-textproxy-wrong-offsetintext: Given offsetInText value is incorrect.",this);if(o<0||t+o>e.offsetSize)throw new mo.b("model-textproxy-wrong-length: Given length value is incorrect.",this);this.data=e.data.substring(t,t+o),this.offsetInText=t}get startOffset(){return null!==this.textNode.startOffset?this.textNode.startOffset+this.offsetInText:null}get offsetSize(){return this.data.length}get endOffset(){return null!==this.startOffset?this.startOffset+this.offsetSize:null}get isPartial(){return this.offsetSize!==this.textNode.offsetSize}get parent(){return this.textNode.parent}get root(){return this.textNode.root}is(e){return"$textProxy"===e||"model:$textProxy"===e||"textProxy"===e||"model:textProxy"===e}getPath(){const e=this.textNode.getPath();return e.length>0&&(e[e.length-1]+=this.offsetInText),e}getAncestors(e={includeSelf:!1,parentFirst:!1}){const t=[];let o=e.includeSelf?this:this.parent;for(;o;)t[e.parentFirst?"push":"unshift"](o),o=o.parent;return t}hasAttribute(e){return this.textNode.hasAttribute(e)}getAttribute(e){return this.textNode.getAttribute(e)}getAttributes(){return this.textNode.getAttributes()}getAttributeKeys(){return this.textNode.getAttributeKeys()}}class vs{constructor(e){this._nodes=[],e&&this._insertNodes(0,e)}[Symbol.iterator](){return this._nodes[Symbol.iterator]()}get length(){return this._nodes.length}get maxOffset(){return this._nodes.reduce((e,t)=>e+t.offsetSize,0)}getNode(e){return this._nodes[e]||null}getNodeIndex(e){const t=this._nodes.indexOf(e);return-1==t?null:t}getNodeStartOffset(e){const t=this.getNodeIndex(e);return null===t?null:this._nodes.slice(0,t).reduce((e,t)=>e+t.offsetSize,0)}indexToOffset(e){if(e==this._nodes.length)return this.maxOffset;const t=this._nodes[e];if(!t)throw new mo.b("model-nodelist-index-out-of-bounds: Given index cannot be found in the node list.",this);return this.getNodeStartOffset(t)}offsetToIndex(e){let t=0;for(const o of this._nodes){if(e>=t&&ee.toJSON())}}class ys extends ws{constructor(e,t,o){super(t),this.name=e,this._children=new vs,o&&this._insertChild(0,o)}get childCount(){return this._children.length}get maxOffset(){return this._children.maxOffset}get isEmpty(){return 0===this.childCount}is(e,t=null){return t?t===this.name&&("element"===e||"model:element"===e):"element"===e||"model:element"===e||"node"===e||"model:node"===e}getChild(e){return this._children.getNode(e)}getChildren(){return this._children[Symbol.iterator]()}getChildIndex(e){return this._children.getNodeIndex(e)}getChildStartOffset(e){return this._children.getNodeStartOffset(e)}offsetToIndex(e){return this._children.offsetToIndex(e)}getNodeByPath(e){let t=this;for(const o of e)t=t.getChild(t.offsetToIndex(o));return t}findAncestor(e,t={includeSelf:!1}){let o=t.includeSelf?this:this.parent;for(;o;){if(o.name===e)return o;o=o.parent}return null}toJSON(){const e=super.toJSON();if(e.name=this.name,this._children.length>0){e.children=[];for(const t of this._children)e.children.push(t.toJSON())}return e}_clone(e=!1){const t=e?Array.from(this._children).map(e=>e._clone(!0)):null;return new ys(this.name,this.getAttributes(),t)}_appendChild(e){this._insertChild(this.childCount,e)}_insertChild(e,t){const o=function(e){if("string"==typeof e)return[new ks(e)];xo(e)||(e=[e]);return Array.from(e).map(e=>"string"==typeof e?new ks(e):e instanceof _s?new ks(e.data,e.getAttributes()):e)}(t);for(const e of o)null!==e.parent&&e._remove(),e.parent=this;this._children._insertNodes(e,o)}_removeChildren(e,t=1){const o=this._children._removeNodes(e,t);for(const e of o)e.parent=null;return o}static fromJSON(e){let t=null;if(e.children){t=[];for(const o of e.children)o.name?t.push(ys.fromJSON(o)):t.push(ks.fromJSON(o))}return new ys(e.name,e.attributes,t)}}class xs{constructor(e={}){if(!e.boundaries&&!e.startPosition)throw new mo.b("model-tree-walker-no-start-position: Neither boundaries nor starting position have been defined.",null);const t=e.direction||"forward";if("forward"!=t&&"backward"!=t)throw new mo.b("model-tree-walker-unknown-direction: Only `backward` and `forward` direction allowed.",e,{direction:t});this.direction=t,this.boundaries=e.boundaries||null,e.startPosition?this.position=e.startPosition.clone():this.position=As._createAt(this.boundaries["backward"==this.direction?"end":"start"]),this.position.stickiness="toNone",this.singleCharacters=!!e.singleCharacters,this.shallow=!!e.shallow,this.ignoreElementEnd=!!e.ignoreElementEnd,this._boundaryStartParent=this.boundaries?this.boundaries.start.parent:null,this._boundaryEndParent=this.boundaries?this.boundaries.end.parent:null,this._visitedParent=this.position.parent}[Symbol.iterator](){return this}skip(e){let t,o,n,i;do{n=this.position,i=this._visitedParent,({done:t,value:o}=this.next())}while(!t&&e(o));t||(this.position=n,this._visitedParent=i)}next(){return"forward"==this.direction?this._next():this._previous()}_next(){const e=this.position,t=this.position.clone(),o=this._visitedParent;if(null===o.parent&&t.offset===o.maxOffset)return{done:!0};if(o===this._boundaryEndParent&&t.offset==this.boundaries.end.offset)return{done:!0};const n=t.parent,i=Ts(t,n),r=i||Ps(t,n,i);if(r instanceof ys)return this.shallow?t.offset++:(t.path.push(0),this._visitedParent=r),this.position=t,Cs("elementStart",r,e,t,1);if(r instanceof ks){let n;if(this.singleCharacters)n=1;else{let e=r.endOffset;this._boundaryEndParent==o&&this.boundaries.end.offsete&&(e=this.boundaries.start.offset),n=t.offset-e}const i=t.offset-r.startOffset,s=new _s(r,i-n,n);return t.offset-=n,this.position=t,Cs("text",s,e,t,n)}return t.path.pop(),this.position=t,this._visitedParent=o.parent,Cs("elementStart",o,e,t,1)}}function Cs(e,t,o,n,i){return{done:!1,value:{type:e,item:t,previousPosition:o,nextPosition:n,length:i}}}class As{constructor(e,t,o="toNone"){if(!e.is("element")&&!e.is("documentFragment"))throw new mo.b("model-position-root-invalid: Position root invalid.",e);if(!(t instanceof Array)||0===t.length)throw new mo.b("model-position-path-incorrect-format: Position path must be an array with at least one item.",e,{path:t});e.is("rootElement")?t=t.slice():(t=[...e.getPath(),...t],e=e.root),this.root=e,this.path=t,this.stickiness=o}get offset(){return this.path[this.path.length-1]}set offset(e){this.path[this.path.length-1]=e}get parent(){let e=this.root;for(let t=0;to.path.length){if(t.offset!==n.maxOffset)return!1;t.path=t.path.slice(0,-1),n=n.parent,t.offset++}else{if(0!==o.offset)return!1;o.path=o.path.slice(0,-1)}}}is(e){return"position"===e||"model:position"===e}hasSameParentAs(e){if(this.root!==e.root)return!1;return"same"==Vo(this.getParentPath(),e.getParentPath())}getTransformedByOperation(e){let t;switch(e.type){case"insert":t=this._getTransformedByInsertOperation(e);break;case"move":case"remove":case"reinsert":t=this._getTransformedByMoveOperation(e);break;case"split":t=this._getTransformedBySplitOperation(e);break;case"merge":t=this._getTransformedByMergeOperation(e);break;default:t=As._createAt(this)}return t}_getTransformedByInsertOperation(e){return this._getTransformedByInsertion(e.position,e.howMany)}_getTransformedByMoveOperation(e){return this._getTransformedByMove(e.sourcePosition,e.targetPosition,e.howMany)}_getTransformedBySplitOperation(e){const t=e.movedRange;return t.containsPosition(this)||t.start.isEqual(this)&&"toNext"==this.stickiness?this._getCombined(e.splitPosition,e.moveTargetPosition):e.graveyardPosition?this._getTransformedByMove(e.graveyardPosition,e.insertionPosition,1):this._getTransformedByInsertion(e.insertionPosition,1)}_getTransformedByMergeOperation(e){const t=e.movedRange;let o;return t.containsPosition(this)||t.start.isEqual(this)?(o=this._getCombined(e.sourcePosition,e.targetPosition),e.sourcePosition.isBefore(e.targetPosition)&&(o=o._getTransformedByDeletion(e.deletionPosition,1))):o=this.isEqual(e.deletionPosition)?As._createAt(e.deletionPosition):this._getTransformedByMove(e.deletionPosition,e.graveyardPosition,1),o}_getTransformedByDeletion(e,t){const o=As._createAt(this);if(this.root!=e.root)return o;if("same"==Vo(e.getParentPath(),this.getParentPath())){if(e.offsetthis.offset)return null;o.offset-=t}}else if("prefix"==Vo(e.getParentPath(),this.getParentPath())){const n=e.path.length-1;if(e.offset<=this.path[n]){if(e.offset+t>this.path[n])return null;o.path[n]-=t}}return o}_getTransformedByInsertion(e,t){const o=As._createAt(this);if(this.root!=e.root)return o;if("same"==Vo(e.getParentPath(),this.getParentPath()))(e.offsett+1;){const t=n.maxOffset-o.offset;0!==t&&e.push(new Es(o,o.getShiftedBy(t))),o.path=o.path.slice(0,-1),o.offset++,n=n.parent}for(;o.path.length<=this.end.path.length;){const t=this.end.path[o.path.length-1],n=t-o.offset;0!==n&&e.push(new Es(o,o.getShiftedBy(n))),o.offset=t,o.path.push(0)}return e}getWalker(e={}){return e.boundaries=this,new xs(e)}*getItems(e={}){e.boundaries=this,e.ignoreElementEnd=!0;const t=new xs(e);for(const e of t)yield e.item}*getPositions(e={}){e.boundaries=this;const t=new xs(e);yield t.position;for(const e of t)yield e.nextPosition}getTransformedByOperation(e){switch(e.type){case"insert":return this._getTransformedByInsertOperation(e);case"move":case"remove":case"reinsert":return this._getTransformedByMoveOperation(e);case"split":return[this._getTransformedBySplitOperation(e)];case"merge":return[this._getTransformedByMergeOperation(e)]}return[new Es(this.start,this.end)]}getTransformedByOperations(e){const t=[new Es(this.start,this.end)];for(const o of e)for(let e=0;e0?new this(o,n):new this(n,o)}static _createIn(e){return new this(As._createAt(e,0),As._createAt(e,e.maxOffset))}static _createOn(e){return this._createFromPositionAndShift(As._createBefore(e),e.offsetSize)}static _createFromRanges(e){if(0===e.length)throw new mo.b("range-create-from-ranges-empty-array: At least one range has to be passed.",null);if(1==e.length)return e[0].clone();const t=e[0];e.sort((e,t)=>e.start.isAfter(t.start)?1:-1);const o=e.indexOf(t),n=new this(t.start,t.end);if(o>0)for(let t=o-1;e[t].end.isEqual(n.start);t++)n.start=As._createAt(e[t].start);for(let t=o+1;t{if(t.viewPosition)return;const o=this._modelToViewMapping.get(t.modelPosition.parent);t.viewPosition=this.findPositionIn(o,t.modelPosition.offset)},{priority:"low"}),this.on("viewToModelPosition",(e,t)=>{if(t.modelPosition)return;const o=this.findMappedViewAncestor(t.viewPosition),n=this._viewToModelMapping.get(o),i=this._toModelOffset(t.viewPosition.parent,t.viewPosition.offset,o);t.modelPosition=As._createAt(n,i)},{priority:"low"})}bindElements(e,t){this._modelToViewMapping.set(e,t),this._viewToModelMapping.set(t,e)}unbindViewElement(e){const t=this.toModelElement(e);if(this._viewToModelMapping.delete(e),this._elementToMarkerNames.has(e))for(const t of this._elementToMarkerNames.get(e))this._unboundMarkerNames.add(t);this._modelToViewMapping.get(t)==e&&this._modelToViewMapping.delete(t)}unbindModelElement(e){const t=this.toViewElement(e);this._modelToViewMapping.delete(e),this._viewToModelMapping.get(t)==e&&this._viewToModelMapping.delete(t)}bindElementToMarker(e,t){const o=this._markerNameToElements.get(t)||new Set;o.add(e);const n=this._elementToMarkerNames.get(e)||new Set;n.add(t),this._markerNameToElements.set(t,o),this._elementToMarkerNames.set(e,n)}unbindElementFromMarkerName(e,t){const o=this._markerNameToElements.get(t);o&&(o.delete(e),0==o.size&&this._markerNameToElements.delete(t));const n=this._elementToMarkerNames.get(e);n&&(n.delete(t),0==n.size&&this._elementToMarkerNames.delete(e))}flushUnboundMarkerNames(){const e=Array.from(this._unboundMarkerNames);return this._unboundMarkerNames.clear(),e}clearBindings(){this._modelToViewMapping=new WeakMap,this._viewToModelMapping=new WeakMap,this._markerNameToElements=new Map,this._elementToMarkerNames=new Map,this._unboundMarkerNames=new Set}toModelElement(e){return this._viewToModelMapping.get(e)}toViewElement(e){return this._modelToViewMapping.get(e)}toModelRange(e){return new Es(this.toModelPosition(e.start),this.toModelPosition(e.end))}toViewRange(e){return new ti(this.toViewPosition(e.start),this.toViewPosition(e.end))}toModelPosition(e){const t={viewPosition:e,mapper:this};return this.fire("viewToModelPosition",t),t.modelPosition}toViewPosition(e,t={isPhantom:!1}){const o={modelPosition:e,mapper:this,isPhantom:t.isPhantom};return this.fire("modelToViewPosition",o),o.viewPosition}markerNameToElements(e){const t=this._markerNameToElements.get(e);if(!t)return null;const o=new Set;for(const e of t)if(e.is("attributeElement"))for(const t of e.getElementsWithSameId())o.add(t);else o.add(e);return o}registerViewToModelLength(e,t){this._viewToModelLengthCallbacks.set(e,t)}findMappedViewAncestor(e){let t=e.parent;for(;!this._viewToModelMapping.has(t);)t=t.parent;return t}_toModelOffset(e,t,o){if(o!=e){return this._toModelOffset(e.parent,e.index,o)+this._toModelOffset(e,t,e)}if(e.is("$text"))return t;let n=0;for(let o=0;o1?t[0]+":"+t[1]:t[0]}class Os{constructor(e){this.conversionApi=Object.assign({dispatcher:this},e)}convertChanges(e,t,o){for(const t of e.getMarkersToRemove())this.convertMarkerRemove(t.name,t.range,o);for(const t of e.getChanges())"insert"==t.type?this.convertInsert(Es._createFromPositionAndShift(t.position,t.length),o):"remove"==t.type?this.convertRemove(t.position,t.length,t.name,o):this.convertAttribute(t.range,t.attributeKey,t.attributeOldValue,t.attributeNewValue,o);for(const e of this.conversionApi.mapper.flushUnboundMarkerNames()){const n=t.get(e).getRange();this.convertMarkerRemove(e,n,o),this.convertMarkerAdd(e,n,o)}for(const t of e.getMarkersToAdd())this.convertMarkerAdd(t.name,t.range,o)}convertInsert(e,t){this.conversionApi.writer=t,this.conversionApi.consumable=this._createInsertConsumable(e);for(const t of e){const e=t.item,o={item:e,range:Es._createFromPositionAndShift(t.previousPosition,t.length)};this._testAndFire("insert",o);for(const t of e.getAttributeKeys())o.attributeKey=t,o.attributeOldValue=null,o.attributeNewValue=e.getAttribute(t),this._testAndFire("attribute:"+t,o)}this._clearConversionApi()}convertRemove(e,t,o,n){this.conversionApi.writer=n,this.fire("remove:"+o,{position:e,length:t},this.conversionApi),this._clearConversionApi()}convertAttribute(e,t,o,n,i){this.conversionApi.writer=i,this.conversionApi.consumable=this._createConsumableForRange(e,"attribute:"+t);for(const i of e){const e={item:i.item,range:Es._createFromPositionAndShift(i.previousPosition,i.length),attributeKey:t,attributeOldValue:o,attributeNewValue:n};this._testAndFire("attribute:"+t,e)}this._clearConversionApi()}convertSelection(e,t,o){const n=Array.from(t.getMarkersAtPosition(e.getFirstPosition()));if(this.conversionApi.writer=o,this.conversionApi.consumable=this._createSelectionConsumable(e,n),this.fire("selection",{selection:e},this.conversionApi),e.isCollapsed){for(const t of n){const o=t.getRange();if(!Ms(e.getFirstPosition(),t,this.conversionApi.mapper))continue;const n={item:e,markerName:t.name,markerRange:o};this.conversionApi.consumable.test(e,"addMarker:"+t.name)&&this.fire("addMarker:"+t.name,n,this.conversionApi)}for(const t of e.getAttributeKeys()){const o={item:e,range:e.getFirstRange(),attributeKey:t,attributeOldValue:null,attributeNewValue:e.getAttribute(t)};this.conversionApi.consumable.test(e,"attribute:"+o.attributeKey)&&this.fire("attribute:"+o.attributeKey+":$text",o,this.conversionApi)}this._clearConversionApi()}}convertMarkerAdd(e,t,o){if(!t.root.document||"$graveyard"==t.root.rootName)return;this.conversionApi.writer=o;const n="addMarker:"+e,i=new Is;if(i.add(t,n),this.conversionApi.consumable=i,this.fire(n,{markerName:e,markerRange:t},this.conversionApi),i.test(t,n)){this.conversionApi.consumable=this._createConsumableForRange(t,n);for(const o of t.getItems()){if(!this.conversionApi.consumable.test(o,n))continue;const i={item:o,range:Es._createOn(o),markerName:e,markerRange:t};this.fire(n,i,this.conversionApi)}this._clearConversionApi()}}convertMarkerRemove(e,t,o){t.root.document&&"$graveyard"!=t.root.rootName&&(this.conversionApi.writer=o,this.fire("removeMarker:"+e,{markerName:e,markerRange:t},this.conversionApi),this._clearConversionApi())}_createInsertConsumable(e){const t=new Is;for(const o of e){const e=o.item;t.add(e,"insert");for(const o of e.getAttributeKeys())t.add(e,"attribute:"+o)}return t}_createConsumableForRange(e,t){const o=new Is;for(const n of e.getItems())o.add(n,t);return o}_createSelectionConsumable(e,t){const o=new Is;o.add(e,"selection");for(const n of t)o.add(e,"addMarker:"+n.name);for(const t of e.getAttributeKeys())o.add(e,"attribute:"+t);return o}_testAndFire(e,t){if(!this.conversionApi.consumable.test(t.item,e))return;const o=t.item.name||"$text";this.fire(e+":"+o,t,this.conversionApi)}_clearConversionApi(){delete this.conversionApi.writer,delete this.conversionApi.consumable}}function Ms(e,t,o){const n=t.getRange(),i=Array.from(e.getAncestors());i.shift(),i.reverse();return!i.some(e=>{if(n.containsItem(e)){return!!o.toViewElement(e).getCustomProperty("addHighlight")}})}Co(Os,po);class Ns{constructor(e,t,o){this._lastRangeBackward=!1,this._ranges=[],this._attrs=new Map,e&&this.setTo(e,t,o)}get anchor(){if(this._ranges.length>0){const e=this._ranges[this._ranges.length-1];return this._lastRangeBackward?e.end:e.start}return null}get focus(){if(this._ranges.length>0){const e=this._ranges[this._ranges.length-1];return this._lastRangeBackward?e.start:e.end}return null}get isCollapsed(){return 1===this._ranges.length&&this._ranges[0].isCollapsed}get rangeCount(){return this._ranges.length}get isBackward(){return!this.isCollapsed&&this._lastRangeBackward}isEqual(e){if(this.rangeCount!=e.rangeCount)return!1;if(0===this.rangeCount)return!0;if(!this.anchor.isEqual(e.anchor)||!this.focus.isEqual(e.focus))return!1;for(const t of this._ranges){let o=!1;for(const n of e._ranges)if(t.isEqual(n)){o=!0;break}if(!o)return!1}return!0}*getRanges(){for(const e of this._ranges)yield new Es(e.start,e.end)}getFirstRange(){let e=null;for(const t of this._ranges)e&&!t.start.isBefore(e.start)||(e=t);return e?new Es(e.start,e.end):null}getLastRange(){let e=null;for(const t of this._ranges)e&&!t.end.isAfter(e.end)||(e=t);return e?new Es(e.start,e.end):null}getFirstPosition(){const e=this.getFirstRange();return e?e.start.clone():null}getLastPosition(){const e=this.getLastRange();return e?e.end.clone():null}setTo(e,t,o){if(null===e)this._setRanges([]);else if(e instanceof Ns)this._setRanges(e.getRanges(),e.isBackward);else if(e&&"function"==typeof e.getRanges)this._setRanges(e.getRanges(),e.isBackward);else if(e instanceof Es)this._setRanges([e],!!t&&!!t.backward);else if(e instanceof As)this._setRanges([new Es(e)]);else if(e instanceof ws){const n=!!o&&!!o.backward;let i;if("in"==t)i=Es._createIn(e);else if("on"==t)i=Es._createOn(e);else{if(void 0===t)throw new mo.b("model-selection-setTo-required-second-parameter: selection.setTo requires the second parameter when the first parameter is a node.",[this,e]);i=new Es(As._createAt(e,t))}this._setRanges([i],n)}else{if(!xo(e))throw new mo.b("model-selection-setTo-not-selectable: Cannot set the selection to the given place.",[this,e]);this._setRanges(e,t&&!!t.backward)}}_setRanges(e,t=!1){const o=(e=Array.from(e)).some(t=>{if(!(t instanceof Es))throw new mo.b("model-selection-set-ranges-not-range: Selection range set to an object that is not an instance of model.Range.",[this,e]);return this._ranges.every(e=>!e.isEqual(t))});if(e.length!==this._ranges.length||o){this._removeAllRanges();for(const t of e)this._pushRange(t);this._lastRangeBackward=!!t,this.fire("change:range",{directChange:!0})}}setFocus(e,t){if(null===this.anchor)throw new mo.b("model-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.",[this,e]);const o=As._createAt(e,t);if("same"==o.compareWith(this.focus))return;const n=this.anchor;this._ranges.length&&this._popRange(),"before"==o.compareWith(n)?(this._pushRange(new Es(o,n)),this._lastRangeBackward=!0):(this._pushRange(new Es(n,o)),this._lastRangeBackward=!1),this.fire("change:range",{directChange:!0})}getAttribute(e){return this._attrs.get(e)}getAttributes(){return this._attrs.entries()}getAttributeKeys(){return this._attrs.keys()}hasAttribute(e){return this._attrs.has(e)}removeAttribute(e){this.hasAttribute(e)&&(this._attrs.delete(e),this.fire("change:attribute",{attributeKeys:[e],directChange:!0}))}setAttribute(e,t){this.getAttribute(e)!==t&&(this._attrs.set(e,t),this.fire("change:attribute",{attributeKeys:[e],directChange:!0}))}getSelectedElement(){return 1!==this.rangeCount?null:this.getFirstRange().getContainedElement()}is(e){return"selection"===e||"model:selection"===e}*getSelectedBlocks(){const e=new WeakSet;for(const t of this.getRanges()){const o=Fs(t.start,e);o&&Ds(o,t)&&(yield o);for(const o of t.getWalker()){const n=o.item;"elementEnd"==o.type&&Bs(n,e,t)&&(yield n)}const n=Fs(t.end,e);n&&!t.end.isTouching(As._createAt(n,0))&&Ds(n,t)&&(yield n)}}containsEntireContent(e=this.anchor.root){const t=As._createAt(e,0),o=As._createAt(e,"end");return t.isTouching(this.getFirstPosition())&&o.isTouching(this.getLastPosition())}_pushRange(e){this._checkRange(e),this._ranges.push(new Es(e.start,e.end))}_checkRange(e){for(let t=0;t0;)this._popRange()}_popRange(){this._ranges.pop()}}function zs(e,t){return!t.has(e)&&(t.add(e),e.root.document.model.schema.isBlock(e)&&e.parent)}function Bs(e,t,o){return zs(e,t)&&Ds(e,o)}function Fs(e,t){const o=e.parent.root.document.model.schema,n=e.parent.getAncestors({parentFirst:!0,includeSelf:!0});let i=!1;const r=n.find(e=>!i&&(i=o.isLimit(e),!i&&zs(e,t)));return n.forEach(e=>t.add(e)),r}function Ds(e,t){const o=function(e){const t=e.root.document.model.schema;let o=e.parent;for(;o;){if(t.isBlock(o))return o;o=o.parent}}(e);if(!o)return!0;return!t.containsRange(Es._createOn(o),!0)}Co(Ns,po);class Ls extends Es{constructor(e,t){super(e,t),Hs.call(this)}detach(){this.stopListening()}is(e){return"liveRange"===e||"model:liveRange"===e||"range"==e||"model:range"===e}toRange(){return new Es(this.start,this.end)}static fromRange(e){return new Ls(e.start,e.end)}}function Hs(){this.listenTo(this.root.document.model,"applyOperation",(e,t)=>{const o=t[0];o.isDocumentOperation&&js.call(this,o)},{priority:"low"})}function js(e){const t=this.getTransformedByOperation(e),o=Es._createFromRanges(t),n=!o.isEqual(this),i=function(e,t){switch(t.type){case"insert":return e.containsPosition(t.position);case"move":case"remove":case"reinsert":case"merge":return e.containsPosition(t.sourcePosition)||e.start.isEqual(t.sourcePosition)||e.containsPosition(t.targetPosition);case"split":return e.containsPosition(t.splitPosition)||e.containsPosition(t.insertionPosition)}return!1}(this,e);let r=null;if(n){"$graveyard"==o.root.rootName&&(r="remove"==e.type?e.sourcePosition:e.deletionPosition);const t=this.toRange();this.start=o.start,this.end=o.end,this.fire("change:range",t,{deletionPosition:r})}else i&&this.fire("change:content",this.toRange(),{deletionPosition:r})}Co(Ls,po);class Ws{constructor(e){this._selection=new qs(e),this._selection.delegate("change:range").to(this),this._selection.delegate("change:attribute").to(this),this._selection.delegate("change:marker").to(this)}get isCollapsed(){return this._selection.isCollapsed}get anchor(){return this._selection.anchor}get focus(){return this._selection.focus}get rangeCount(){return this._selection.rangeCount}get hasOwnRange(){return this._selection.hasOwnRange}get isBackward(){return this._selection.isBackward}get isGravityOverridden(){return this._selection.isGravityOverridden}get markers(){return this._selection.markers}get _ranges(){return this._selection._ranges}getRanges(){return this._selection.getRanges()}getFirstPosition(){return this._selection.getFirstPosition()}getLastPosition(){return this._selection.getLastPosition()}getFirstRange(){return this._selection.getFirstRange()}getLastRange(){return this._selection.getLastRange()}getSelectedBlocks(){return this._selection.getSelectedBlocks()}getSelectedElement(){return this._selection.getSelectedElement()}containsEntireContent(e){return this._selection.containsEntireContent(e)}destroy(){this._selection.destroy()}getAttributeKeys(){return this._selection.getAttributeKeys()}getAttributes(){return this._selection.getAttributes()}getAttribute(e){return this._selection.getAttribute(e)}hasAttribute(e){return this._selection.hasAttribute(e)}refresh(){this._selection._updateMarkers(),this._selection._updateAttributes(!1)}is(e){return"selection"===e||"model:selection"==e||"documentSelection"==e||"model:documentSelection"==e}_setFocus(e,t){this._selection.setFocus(e,t)}_setTo(e,t,o){this._selection.setTo(e,t,o)}_setAttribute(e,t){this._selection.setAttribute(e,t)}_removeAttribute(e){this._selection.removeAttribute(e)}_getStoredAttributes(){return this._selection._getStoredAttributes()}_overrideGravity(){return this._selection.overrideGravity()}_restoreGravity(e){this._selection.restoreGravity(e)}static _getStoreAttributeKey(e){return"selection:"+e}static _isStoreAttributeKey(e){return e.startsWith("selection:")}}Co(Ws,po);class qs extends Ns{constructor(e){super(),this.markers=new Ao({idProperty:"name"}),this._model=e.model,this._document=e,this._attributePriority=new Map,this._selectionRestorePosition=null,this._hasChangedRange=!1,this._overriddenGravityRegister=new Set,this.listenTo(this._model,"applyOperation",(e,t)=>{const o=t[0];o.isDocumentOperation&&"marker"!=o.type&&"rename"!=o.type&&"noop"!=o.type&&(0==this._ranges.length&&this._selectionRestorePosition&&this._fixGraveyardSelection(this._selectionRestorePosition),this._selectionRestorePosition=null,this._hasChangedRange&&(this._hasChangedRange=!1,this.fire("change:range",{directChange:!1})))},{priority:"lowest"}),this.on("change:range",()=>{for(const e of this.getRanges())if(!this._document._validateSelectionRange(e))throw new mo.b("document-selection-wrong-position: Range from document selection starts or ends at incorrect position.",this,{range:e})}),this.listenTo(this._model.markers,"update",()=>this._updateMarkers()),this.listenTo(this._document,"change",(e,t)=>{!function(e,t){const o=e.document.differ;for(const n of o.getChanges()){if("insert"!=n.type)continue;const o=n.position.parent;n.length===o.maxOffset&&e.enqueueChange(t,e=>{const t=Array.from(o.getAttributeKeys()).filter(e=>e.startsWith("selection:"));for(const n of t)e.removeAttribute(n,o)})}}(this._model,t)})}get isCollapsed(){return 0===this._ranges.length?this._document._getDefaultRange().isCollapsed:super.isCollapsed}get anchor(){return super.anchor||this._document._getDefaultRange().start}get focus(){return super.focus||this._document._getDefaultRange().end}get rangeCount(){return this._ranges.length?this._ranges.length:1}get hasOwnRange(){return this._ranges.length>0}get isGravityOverridden(){return!!this._overriddenGravityRegister.size}destroy(){for(let e=0;e{if(this._hasChangedRange=!0,t.root==this._document.graveyard){this._selectionRestorePosition=n.deletionPosition;const e=this._ranges.indexOf(t);this._ranges.splice(e,1),t.detach()}}),t}_updateMarkers(){const e=[];let t=!1;for(const t of this._model.markers){const o=t.getRange();for(const n of this.getRanges())o.containsRange(n,!n.isCollapsed)&&e.push(t)}const o=Array.from(this.markers);for(const o of e)this.markers.has(o)||(this.markers.add(o),t=!0);for(const o of Array.from(this.markers))e.includes(o)||(this.markers.remove(o),t=!0);t&&this.fire("change:marker",{oldMarkers:o,directChange:!1})}_updateAttributes(e){const t=Bo(this._getSurroundingAttributes()),o=Bo(this.getAttributes());if(e)this._attributePriority=new Map,this._attrs=new Map;else for(const[e,t]of this._attributePriority)"low"==t&&(this._attrs.delete(e),this._attributePriority.delete(e));this._setAttributesTo(t);const n=[];for(const[e,t]of this.getAttributes())o.has(e)&&o.get(e)===t||n.push(e);for(const[e]of o)this.hasAttribute(e)||n.push(e);n.length>0&&this.fire("change:attribute",{attributeKeys:n,directChange:!1})}_setAttribute(e,t,o=!0){const n=o?"normal":"low";if("low"==n&&"normal"==this._attributePriority.get(e))return!1;return super.getAttribute(e)!==t&&(this._attrs.set(e,t),this._attributePriority.set(e,n),!0)}_removeAttribute(e,t=!0){const o=t?"normal":"low";return("low"!=o||"normal"!=this._attributePriority.get(e))&&(this._attributePriority.set(e,o),!!super.hasAttribute(e)&&(this._attrs.delete(e),!0))}_setAttributesTo(e){const t=new Set;for(const[t,o]of this.getAttributes())e.get(t)!==o&&this._removeAttribute(t,!1);for(const[o,n]of e){this._setAttribute(o,n,!1)&&t.add(o)}return t}*_getStoredAttributes(){const e=this.getFirstPosition().parent;if(this.isCollapsed&&e.isEmpty)for(const t of e.getAttributeKeys())if(t.startsWith("selection:")){const o=t.substr("selection:".length);yield[o,e.getAttribute(t)]}}_getSurroundingAttributes(){const e=this.getFirstPosition(),t=this._model.schema;let o=null;if(this.isCollapsed){const n=e.textNode?e.textNode:e.nodeBefore,i=e.textNode?e.textNode:e.nodeAfter;if(this.isGravityOverridden||(o=$s(n)),o||(o=$s(i)),!this.isGravityOverridden&&!o){let e=n;for(;e&&!t.isInline(e)&&!o;)e=e.previousSibling,o=$s(e)}if(!o){let e=i;for(;e&&!t.isInline(e)&&!o;)e=e.nextSibling,o=$s(e)}o||(o=this._getStoredAttributes())}else{const e=this.getFirstRange();for(const n of e){if(n.item.is("element")&&t.isObject(n.item))break;if("text"==n.type){o=n.item.getAttributes();break}}}return o}_fixGraveyardSelection(e){const t=this._model.schema.getNearestSelectionRange(e);t&&this._pushRange(t)}}function $s(e){return e instanceof _s||e instanceof ks?e.getAttributes():null}class Us{constructor(e){this._dispatchers=e}add(e){for(const t of this._dispatchers)e(t);return this}}var Gs=function(e){return to(e,5)};class Ks extends Us{elementToElement(e){return this.add(function(e){return(e=Gs(e)).view=Qs(e.view,"container"),t=>{var o;t.on("insert:"+e.model,(o=e.view,(e,t,n)=>{const i=o(t.item,n);if(!i)return;if(!n.consumable.consume(t.item,"insert"))return;const r=n.mapper.toViewPosition(t.range.start);n.mapper.bindElements(t.item,i),n.writer.insert(r,i)}),{priority:e.converterPriority||"normal"})}}(e))}attributeToElement(e){return this.add(function(e){e=Gs(e);let t="attribute:"+(e.model.key?e.model.key:e.model);e.model.name&&(t+=":"+e.model.name);if(e.model.values)for(const t of e.model.values)e.view[t]=Qs(e.view[t],"attribute");else e.view=Qs(e.view,"attribute");const o=Xs(e);return n=>{n.on(t,function(e){return(t,o,n)=>{const i=e(o.attributeOldValue,n),r=e(o.attributeNewValue,n);if(!i&&!r)return;if(!n.consumable.consume(o.item,t.name))return;const s=n.writer,a=s.document.selection;if(o.item instanceof Ns||o.item instanceof Ws)s.wrap(a.getFirstRange(),r);else{let e=n.mapper.toViewRange(o.range);null!==o.attributeOldValue&&i&&(e=s.unwrap(e,i)),null!==o.attributeNewValue&&r&&s.wrap(e,r)}}}(o),{priority:e.converterPriority||"normal"})}}(e))}attributeToAttribute(e){return this.add(function(e){e=Gs(e);let t="attribute:"+(e.model.key?e.model.key:e.model);e.model.name&&(t+=":"+e.model.name);if(e.model.values)for(const t of e.model.values)e.view[t]=Zs(e.view[t]);else e.view=Zs(e.view);const o=Xs(e);return n=>{var i;n.on(t,(i=o,(e,t,o)=>{const n=i(t.attributeOldValue,o),r=i(t.attributeNewValue,o);if(!n&&!r)return;if(!o.consumable.consume(t.item,e.name))return;const s=o.mapper.toViewElement(t.item),a=o.writer;if(!s)throw new mo.b("conversion-attribute-to-attribute-on-text: Trying to convert text node's attribute with attribute-to-attribute converter.",[t,o]);if(null!==t.attributeOldValue&&n)if("class"==n.key){const e=Array.isArray(n.value)?n.value:[n.value];for(const t of e)a.removeClass(t,s)}else if("style"==n.key){const e=Object.keys(n.value);for(const t of e)a.removeStyle(t,s)}else a.removeAttribute(n.key,s);if(null!==t.attributeNewValue&&r)if("class"==r.key){const e=Array.isArray(r.value)?r.value:[r.value];for(const t of e)a.addClass(t,s)}else if("style"==r.key){const e=Object.keys(r.value);for(const t of e)a.setStyle(t,r.value[t],s)}else a.setAttribute(r.key,r.value,s)}),{priority:e.converterPriority||"normal"})}}(e))}markerToElement(e){return this.add(function(e){return(e=Gs(e)).view=Qs(e.view,"ui"),t=>{var o;t.on("addMarker:"+e.model,(o=e.view,(e,t,n)=>{t.isOpening=!0;const i=o(t,n);t.isOpening=!1;const r=o(t,n);if(!i||!r)return;const s=t.markerRange;if(s.isCollapsed&&!n.consumable.consume(s,e.name))return;for(const t of s)if(!n.consumable.consume(t.item,e.name))return;const a=n.mapper,l=n.writer;l.insert(a.toViewPosition(s.start),i),n.mapper.bindElementToMarker(i,t.markerName),s.isCollapsed||(l.insert(a.toViewPosition(s.end),r),n.mapper.bindElementToMarker(r,t.markerName)),e.stop()}),{priority:e.converterPriority||"normal"}),t.on("removeMarker:"+e.model,(e.view,(e,t,o)=>{const n=o.mapper.markerNameToElements(t.markerName);if(n){for(const e of n)o.mapper.unbindElementFromMarkerName(e,t.markerName),o.writer.clear(o.writer.createRangeOn(e),e);o.writer.clearClonedElementsGroup(t.markerName),e.stop()}}),{priority:e.converterPriority||"normal"})}}(e))}markerToHighlight(e){return this.add(function(e){return t=>{var o;t.on("addMarker:"+e.model,(o=e.view,(e,t,n)=>{if(!t.item)return;if(!(t.item instanceof Ns||t.item instanceof Ws||t.item.is("$textProxy")))return;const i=ea(o,t,n);if(!i)return;if(!n.consumable.consume(t.item,e.name))return;const r=n.writer,s=Js(r,i),a=r.document.selection;if(t.item instanceof Ns||t.item instanceof Ws)r.wrap(a.getFirstRange(),s,a);else{const e=n.mapper.toViewRange(t.range),o=r.wrap(e,s);for(const e of o.getItems())if(e.is("attributeElement")&&e.isSimilar(s)){n.mapper.bindElementToMarker(e,t.markerName);break}}}),{priority:e.converterPriority||"normal"}),t.on("addMarker:"+e.model,function(e){return(t,o,n)=>{if(!o.item)return;if(!(o.item instanceof ys))return;const i=ea(e,o,n);if(!i)return;if(!n.consumable.test(o.item,t.name))return;const r=n.mapper.toViewElement(o.item);if(r&&r.getCustomProperty("addHighlight")){n.consumable.consume(o.item,t.name);for(const e of Es._createIn(o.item))n.consumable.consume(e.item,t.name);r.getCustomProperty("addHighlight")(r,i,n.writer),n.mapper.bindElementToMarker(r,o.markerName)}}}(e.view),{priority:e.converterPriority||"normal"}),t.on("removeMarker:"+e.model,function(e){return(t,o,n)=>{if(o.markerRange.isCollapsed)return;const i=ea(e,o,n);if(!i)return;const r=Js(n.writer,i),s=n.mapper.markerNameToElements(o.markerName);if(s){for(const e of s)n.mapper.unbindElementFromMarkerName(e,o.markerName),e.is("attributeElement")?n.writer.unwrap(n.writer.createRangeOn(e),r):e.getCustomProperty("removeHighlight")(e,i.id,n.writer);n.writer.clearClonedElementsGroup(o.markerName),t.stop()}}}(e.view),{priority:e.converterPriority||"normal"})}}(e))}markerToData(e){return this.add(function(e){const t=(e=Gs(e)).model;e.view||(e.view=o=>({group:t,name:o.substr(e.model.length+1)}));return o=>{var n;o.on("addMarker:"+t,(n=e.view,(e,t,o)=>{const i=n(t.markerName,o);if(!i)return;const r=t.markerRange;o.consumable.consume(r,e.name)&&(Ys(r,!1,o,t,i),Ys(r,!0,o,t,i),e.stop())}),{priority:e.converterPriority||"normal"}),o.on("removeMarker:"+t,function(e){return(t,o,n)=>{const i=e(o.markerName,n);if(!i)return;const r=n.mapper.markerNameToElements(o.markerName);if(r){for(const e of r)n.mapper.unbindElementFromMarkerName(e,o.markerName),e.is("containerElement")?(s(`data-${i.group}-start-before`,e),s(`data-${i.group}-start-after`,e),s(`data-${i.group}-end-before`,e),s(`data-${i.group}-end-after`,e)):n.writer.clear(n.writer.createRangeOn(e),e);n.writer.clearClonedElementsGroup(o.markerName),t.stop()}function s(e,t){if(t.hasAttribute(e)){const o=new Set(t.getAttribute(e).split(","));o.delete(i.name),0==o.size?n.writer.removeAttribute(e,t):n.writer.setAttribute(e,Array.from(o).join(","),t)}}}}(e.view),{priority:e.converterPriority||"normal"})}}(e))}}function Js(e,t){const o=e.createAttributeElement("span",t.attributes);return t.classes&&o._addClass(t.classes),t.priority&&(o._priority=t.priority),o._id=t.id,o}function Ys(e,t,o,n,i){const r=t?e.start:e.end;if(o.schema.checkChild(r,"$text")){!function(e,t,o,n,i){const r=`${i.group}-${t?"start":"end"}`,s=i.name?{name:i.name}:null,a=o.writer.createUIElement(r,s);o.writer.insert(e,a),o.mapper.bindElementToMarker(a,n.markerName)}(o.mapper.toViewPosition(r),t,o,n,i)}else{let e,s;t&&r.nodeAfter||!t&&!r.nodeBefore?(e=r.nodeAfter,s=!0):(e=r.nodeBefore,s=!1);!function(e,t,o,n,i,r){const s=`data-${r.group}-${t?"start":"end"}-${o?"before":"after"}`,a=e.hasAttribute(s)?e.getAttribute(s).split(","):[];a.unshift(r.name),n.writer.setAttribute(s,a.join(","),e),n.mapper.bindElementToMarker(e,i.markerName)}(o.mapper.toViewElement(e),t,s,o,n,i)}}function Qs(e,t){return"function"==typeof e?e:(o,n)=>function(e,t,o){"string"==typeof e&&(e={name:e});let n;const i=t.writer,r=Object.assign({},e.attributes);if("container"==o)n=i.createContainerElement(e.name,r);else if("attribute"==o){const t={priority:e.priority||ai.DEFAULT_PRIORITY};n=i.createAttributeElement(e.name,r,t)}else n=i.createUIElement(e.name,r);if(e.styles){const t=Object.keys(e.styles);for(const o of t)i.setStyle(o,e.styles[o],n)}if(e.classes){const t=e.classes;if("string"==typeof t)i.addClass(t,n);else for(const e of t)i.addClass(e,n)}return n}(e,n,t)}function Xs(e){return e.model.values?(t,o)=>{const n=e.view[t];return n?n(t,o):null}:e.view}function Zs(e){return"string"==typeof e?t=>({key:e,value:t}):"object"==typeof e?e.value?()=>e:t=>({key:e.key,value:t}):e}function ea(e,t,o){const n="function"==typeof e?e(t,o):e;return n?(n.priority||(n.priority=10),n.id||(n.id=t.markerName),n):null}function ta(e){const{schema:t,document:o}=e.model;for(const n of o.getRootNames()){const i=o.getRoot(n);if(i.isEmpty&&!t.checkChild(i,"$text")&&t.checkChild(i,"paragraph"))return e.insertElement("paragraph",i),!0}return!1}function oa(e,t,o){const n=o.createContext(e);return!!o.checkChild(n,"paragraph")&&!!o.checkChild(n.push("paragraph"),t)}function na(e,t){const o=t.createElement("paragraph");return t.insert(o,e),t.createPositionAt(o,0)}class ia extends Us{elementToElement(e){return this.add(ra(e))}elementToAttribute(e){return this.add(function(e){la(e=Gs(e));const t=ca(e,!1),o=sa(e.view),n=o?"element:"+o:"element";return o=>{o.on(n,t,{priority:e.converterPriority||"low"})}}(e))}attributeToAttribute(e){return this.add(function(e){e=Gs(e);let t=null;("string"==typeof e.view||e.view.key)&&(t=function(e){"string"==typeof e.view&&(e.view={key:e.view});const t=e.view.key;let o;if("class"==t||"style"==t){o={["class"==t?"classes":"styles"]:e.view.value}}else{const n=void 0===e.view.value?/[\s\S]*/:e.view.value;o={attributes:{[t]:n}}}e.view.name&&(o.name=e.view.name);return e.view=o,t}(e));la(e,t);const o=ca(e,!0);return t=>{t.on("element",o,{priority:e.converterPriority||"low"})}}(e))}elementToMarker(e){return console.warn(Object(mo.a)("upcast-helpers-element-to-marker-deprecated: The UpcastHelpers#elementToMarker() method was deprecated and will be removed in the near future. Please use UpcastHelpers#dataToMarker() instead.")),this.add(function(e){return function(e){const t=e.model;e.model=(e,o)=>{const n="string"==typeof t?t:t(e,o);return o.writer.createElement("$marker",{"data-name":n})}}(e=Gs(e)),ra(e)}(e))}dataToMarker(e){return this.add(function(e){(e=Gs(e)).model||(e.model=t=>t?e.view+":"+t:e.view);const t=aa(da(e,"start")),o=aa(da(e,"end"));return n=>{n.on("element:"+e.view+"-start",t,{priority:e.converterPriority||"normal"}),n.on("element:"+e.view+"-end",o,{priority:e.converterPriority||"normal"});const i=uo.get("low"),r=uo.get("highest"),s=uo.get(e.converterPriority)/r;n.on("element",function(e){return(t,o,n)=>{const i="data-"+e.view;function r(t,i){for(const r of i){const i=e.model(r,n),s=n.writer.createElement("$marker",{"data-name":i});n.writer.insert(s,t),o.modelCursor.isEqual(t)?o.modelCursor=o.modelCursor.getShiftedBy(1):o.modelCursor=o.modelCursor._getTransformedByInsertion(t,1),o.modelRange=o.modelRange._getTransformedByInsertion(t,1)[0]}}o.modelRange||(o=Object.assign(o,n.convertChildren(o.viewItem,o.modelCursor))),n.consumable.consume(o.viewItem,{attributes:i+"-end-after"})&&r(o.modelRange.end,o.viewItem.getAttribute(i+"-end-after").split(",")),n.consumable.consume(o.viewItem,{attributes:i+"-start-after"})&&r(o.modelRange.end,o.viewItem.getAttribute(i+"-start-after").split(",")),n.consumable.consume(o.viewItem,{attributes:i+"-end-before"})&&r(o.modelRange.start,o.viewItem.getAttribute(i+"-end-before").split(",")),n.consumable.consume(o.viewItem,{attributes:i+"-start-before"})&&r(o.modelRange.start,o.viewItem.getAttribute(i+"-start-before").split(","))}}(e),{priority:i+s})}}(e))}}function ra(e){const t=aa(e=Gs(e)),o=sa(e.view),n=o?"element:"+o:"element";return o=>{o.on(n,t,{priority:e.converterPriority||"normal"})}}function sa(e){return"string"==typeof e?e:"object"==typeof e&&"string"==typeof e.name?e.name:null}function aa(e){const t=new Fo(e.view);return(o,n,i)=>{const r=t.match(n.viewItem);if(!r)return;const s=r.match;if(s.name=!0,!i.consumable.test(n.viewItem,s))return;const a=function(e,t,o){return e instanceof Function?e(t,o):o.writer.createElement(e)}(e.model,n.viewItem,i);a&&i.safeInsert(a,n.modelCursor)&&(i.consumable.consume(n.viewItem,s),i.convertChildren(n.viewItem,a),i.updateConversionResult(a,n))}}function la(e,t=null){const o=null===t||(e=>e.getAttribute(t)),n="object"!=typeof e.model?e.model:e.model.key,i="object"!=typeof e.model||void 0===e.model.value?o:e.model.value;e.model={key:n,value:i}}function ca(e,t){const o=new Fo(e.view);return(n,i,r)=>{const s=o.match(i.viewItem);if(!s)return;const a=e.model.key,l="function"==typeof e.model.value?e.model.value(i.viewItem,r):e.model.value;if(null===l)return;if(!function(e,t){const o="function"==typeof e?e(t):e;if("object"==typeof o&&!sa(o))return!1;return!o.classes&&!o.attributes&&!o.styles}(e.view,i.viewItem)?delete s.match.name:s.match.name=!0,!r.consumable.test(i.viewItem,s.match))return;i.modelRange||(i=Object.assign(i,r.convertChildren(i.viewItem,i.modelCursor)));(function(e,t,o,n){let i=!1;for(const r of Array.from(e.getItems({shallow:o})))n.schema.checkAttribute(r,t.key)&&(n.writer.setAttribute(t.key,t.value,r),i=!0);return i})(i.modelRange,{key:a,value:l},t,r)&&r.consumable.consume(i.viewItem,s.match)}}function da(e,t){const o={};return o.view=e.view+"-"+t,o.model=(t,o)=>{const n=t.getAttribute("name"),i=e.model(n,o);return o.writer.createElement("$marker",{"data-name":i})},o}class ha{constructor(e,t){this.model=e,this.view=new bs(t),this.mapper=new Rs,this.downcastDispatcher=new Os({mapper:this.mapper,schema:e.schema});const o=this.model.document,n=o.selection,i=this.model.markers;this.listenTo(this.model,"_beforeChanges",()=>{this.view._disableRendering(!0)},{priority:"highest"}),this.listenTo(this.model,"_afterChanges",()=>{this.view._disableRendering(!1)},{priority:"lowest"}),this.listenTo(o,"change",()=>{this.view.change(e=>{this.downcastDispatcher.convertChanges(o.differ,i,e),this.downcastDispatcher.convertSelection(n,i,e)})},{priority:"low"}),this.listenTo(this.view.document,"selectionChange",function(e,t){return(o,n)=>{const i=n.newSelection,r=[];for(const e of i.getRanges())r.push(t.toModelRange(e));const s=e.createSelection(r,{backward:i.isBackward});s.isEqual(e.document.selection)||e.change(e=>{e.setSelection(s)})}}(this.model,this.mapper)),this.downcastDispatcher.on("insert:$text",(e,t,o)=>{if(!o.consumable.consume(t.item,"insert"))return;const n=o.writer,i=o.mapper.toViewPosition(t.range.start),r=n.createText(t.item.data);n.insert(i,r)},{priority:"lowest"}),this.downcastDispatcher.on("remove",(e,t,o)=>{const n=o.mapper.toViewPosition(t.position),i=t.position.getShiftedBy(t.length),r=o.mapper.toViewPosition(i,{isPhantom:!0}),s=o.writer.createRange(n,r),a=o.writer.remove(s.getTrimmed());for(const e of o.writer.createRangeIn(a).getItems())o.mapper.unbindViewElement(e)},{priority:"low"}),this.downcastDispatcher.on("selection",(e,t,o)=>{const n=o.writer,i=n.document.selection;for(const e of i.getRanges())e.isCollapsed&&e.end.parent.isAttached()&&o.writer.mergeAttributes(e.start);n.setSelection(null)},{priority:"low"}),this.downcastDispatcher.on("selection",(e,t,o)=>{const n=t.selection;if(n.isCollapsed)return;if(!o.consumable.consume(n,"selection"))return;const i=[];for(const e of n.getRanges()){const t=o.mapper.toViewRange(e);i.push(t)}o.writer.setSelection(i,{backward:n.isBackward})},{priority:"low"}),this.downcastDispatcher.on("selection",(e,t,o)=>{const n=t.selection;if(!n.isCollapsed)return;if(!o.consumable.consume(n,"selection"))return;const i=o.writer,r=n.getFirstPosition(),s=o.mapper.toViewPosition(r),a=i.breakAttributes(s);i.setSelection(a)},{priority:"low"}),this.view.document.roots.bindTo(this.model.document.roots).using(e=>{if("$graveyard"==e.rootName)return null;const t=new Xn(this.view.document,e.name);return t.rootName=e.rootName,this.mapper.bindElements(e,t),t})}destroy(){this.view.destroy(),this.stopListening()}}Co(ha,qn);class ua{constructor(){this._commands=new Map}add(e,t){this._commands.set(e,t)}get(e){return this._commands.get(e)}execute(e,...t){const o=this.get(e);if(!o)throw new mo.b("commandcollection-command-not-found: Command does not exist.",this,{commandName:e});return o.execute(...t)}*names(){yield*this._commands.keys()}*commands(){yield*this._commands.values()}[Symbol.iterator](){return this._commands[Symbol.iterator]()}destroy(){for(const e of this.commands())e.destroy()}}class ma{constructor(){this._consumables=new Map}add(e,t){let o;e.is("$text")||e.is("documentFragment")?this._consumables.set(e,!0):(this._consumables.has(e)?o=this._consumables.get(e):(o=new ga(e),this._consumables.set(e,o)),o.add(t))}test(e,t){const o=this._consumables.get(e);return void 0===o?null:e.is("$text")||e.is("documentFragment")?o:o.test(t)}consume(e,t){return!!this.test(e,t)&&(e.is("$text")||e.is("documentFragment")?this._consumables.set(e,!1):this._consumables.get(e).consume(t),!0)}revert(e,t){const o=this._consumables.get(e);void 0!==o&&(e.is("$text")||e.is("documentFragment")?this._consumables.set(e,!0):o.revert(t))}static consumablesFromElement(e){const t={element:e,name:!0,attributes:[],classes:[],styles:[]},o=e.getAttributeKeys();for(const e of o)"style"!=e&&"class"!=e&&t.attributes.push(e);const n=e.getClassNames();for(const e of n)t.classes.push(e);const i=e.getStyleNames();for(const e of i)t.styles.push(e);return t}static createFrom(e,t){if(t||(t=new ma(e)),e.is("$text"))return t.add(e),t;e.is("element")&&t.add(e,ma.consumablesFromElement(e)),e.is("documentFragment")&&t.add(e);for(const o of e.getChildren())t=ma.createFrom(o,t);return t}}class ga{constructor(e){this.element=e,this._canConsumeName=null,this._consumables={attributes:new Map,styles:new Map,classes:new Map}}add(e){e.name&&(this._canConsumeName=!0);for(const t in this._consumables)t in e&&this._add(t,e[t])}test(e){if(e.name&&!this._canConsumeName)return this._canConsumeName;for(const t in this._consumables)if(t in e){const o=this._test(t,e[t]);if(!0!==o)return o}return!0}consume(e){e.name&&(this._canConsumeName=!1);for(const t in this._consumables)t in e&&this._consume(t,e[t])}revert(e){e.name&&(this._canConsumeName=!0);for(const t in this._consumables)t in e&&this._revert(t,e[t])}_add(e,t){const o=ze(t)?t:[t],n=this._consumables[e];for(const t of o){if("attributes"===e&&("class"===t||"style"===t))throw new mo.b("viewconsumable-invalid-attribute: Classes and styles should be handled separately.",this);if(n.set(t,!0),"styles"===e)for(const e of this.element.document.stylesProcessor.getRelatedStyles(t))n.set(e,!0)}}_test(e,t){const o=ze(t)?t:[t],n=this._consumables[e];for(const t of o)if("attributes"!==e||"class"!==t&&"style"!==t){const e=n.get(t);if(void 0===e)return null;if(!e)return!1}else{const e="class"==t?"classes":"styles",o=this._test(e,[...this._consumables[e].keys()]);if(!0!==o)return o}return!0}_consume(e,t){const o=ze(t)?t:[t],n=this._consumables[e];for(const t of o)if("attributes"!==e||"class"!==t&&"style"!==t){if(n.set(t,!1),"styles"==e)for(const e of this.element.document.stylesProcessor.getRelatedStyles(t))n.set(e,!1)}else{const e="class"==t?"classes":"styles";this._consume(e,[...this._consumables[e].keys()])}}_revert(e,t){const o=ze(t)?t:[t],n=this._consumables[e];for(const t of o)if("attributes"!==e||"class"!==t&&"style"!==t){!1===n.get(t)&&n.set(t,!0)}else{const e="class"==t?"classes":"styles";this._revert(e,[...this._consumables[e].keys()])}}}class fa{constructor(){this._sourceDefinitions={},this._attributeProperties={},this.decorate("checkChild"),this.decorate("checkAttribute"),this.on("checkAttribute",(e,t)=>{t[0]=new pa(t[0])},{priority:"highest"}),this.on("checkChild",(e,t)=>{t[0]=new pa(t[0]),t[1]=this.getDefinition(t[1])},{priority:"highest"})}register(e,t){if(this._sourceDefinitions[e])throw new mo.b("schema-cannot-register-item-twice: A single item cannot be registered twice in the schema.",this,{itemName:e});this._sourceDefinitions[e]=[Object.assign({},t)],this._clearCache()}extend(e,t){if(!this._sourceDefinitions[e])throw new mo.b("schema-cannot-extend-missing-item: Cannot extend an item which was not registered yet.",this,{itemName:e});this._sourceDefinitions[e].push(Object.assign({},t)),this._clearCache()}getDefinitions(){return this._compiledDefinitions||this._compile(),this._compiledDefinitions}getDefinition(e){let t;return t="string"==typeof e?e:e.is&&(e.is("$text")||e.is("$textProxy"))?"$text":e.name,this.getDefinitions()[t]}isRegistered(e){return!!this.getDefinition(e)}isBlock(e){const t=this.getDefinition(e);return!(!t||!t.isBlock)}isLimit(e){const t=this.getDefinition(e);return!!t&&!(!t.isLimit&&!t.isObject)}isObject(e){const t=this.getDefinition(e);return!!t&&!!(t.isObject||t.isLimit&&t.isSelectable&&t.isContent)}isInline(e){const t=this.getDefinition(e);return!(!t||!t.isInline)}isSelectable(e){const t=this.getDefinition(e);return!!t&&!(!t.isSelectable&&!t.isObject)}isContent(e){const t=this.getDefinition(e);return!!t&&!(!t.isContent&&!t.isObject)}checkChild(e,t){return!!t&&this._checkContextMatch(t,e)}checkAttribute(e,t){const o=this.getDefinition(e.last);return!!o&&o.allowAttributes.includes(t)}checkMerge(e,t=null){if(e instanceof As){const t=e.nodeBefore,o=e.nodeAfter;if(!(t instanceof ys))throw new mo.b("schema-check-merge-no-element-before: The node before the merge position must be an element.",this);if(!(o instanceof ys))throw new mo.b("schema-check-merge-no-element-after: The node after the merge position must be an element.",this);return this.checkMerge(t,o)}for(const o of t.getChildren())if(!this.checkChild(e,o))return!1;return!0}addChildCheck(e){this.on("checkChild",(t,[o,n])=>{if(!n)return;const i=e(o,n);"boolean"==typeof i&&(t.stop(),t.return=i)},{priority:"high"})}addAttributeCheck(e){this.on("checkAttribute",(t,[o,n])=>{const i=e(o,n);"boolean"==typeof i&&(t.stop(),t.return=i)},{priority:"high"})}setAttributeProperties(e,t){this._attributeProperties[e]=Object.assign(this.getAttributeProperties(e),t)}getAttributeProperties(e){return this._attributeProperties[e]||{}}getLimitElement(e){let t;if(e instanceof As)t=e.parent;else{t=(e instanceof Es?[e]:Array.from(e.getRanges())).reduce((e,t)=>{const o=t.getCommonAncestor();return e?e.getCommonAncestor(o,{includeSelf:!0}):o},null)}for(;!this.isLimit(t)&&t.parent;)t=t.parent;return t}checkAttributeInSelection(e,t){if(e.isCollapsed){const o=[...e.getFirstPosition().getAncestors(),new ks("",e.getAttributes())];return this.checkAttribute(o,t)}{const o=e.getRanges();for(const e of o)for(const o of e)if(this.checkAttribute(o.item,t))return!0}return!1}*getValidRanges(e,t){e=function*(e){for(const t of e)yield*t.getMinimalFlatRanges()}(e);for(const o of e)yield*this._getValidRangesForRange(o,t)}getNearestSelectionRange(e,t="both"){if(this.checkChild(e,"$text"))return new Es(e);let o,n;const i=e.getAncestors().reverse().find(e=>this.isLimit(e))||e.root;"both"!=t&&"backward"!=t||(o=new xs({boundaries:Es._createIn(i),startPosition:e,direction:"backward"})),"both"!=t&&"forward"!=t||(n=new xs({boundaries:Es._createIn(i),startPosition:e}));for(const e of function*(e,t){let o=!1;for(;!o;){if(o=!0,e){const t=e.next();t.done||(o=!1,yield{walker:e,value:t.value})}if(t){const e=t.next();e.done||(o=!1,yield{walker:t,value:e.value})}}}(o,n)){const t=e.walker==o?"elementEnd":"elementStart",n=e.value;if(n.type==t&&this.isObject(n.item))return Es._createOn(n.item);if(this.checkChild(n.nextPosition,"$text"))return new Es(n.nextPosition)}return null}findAllowedParent(e,t){let o=e.parent;for(;o;){if(this.checkChild(o,t))return o;if(this.isLimit(o))return null;o=o.parent}return null}removeDisallowedAttributes(e,t){for(const o of e)if(o.is("$text"))Pa(this,o,t);else{const e=Es._createIn(o).getPositions();for(const o of e){Pa(this,o.nodeBefore||o.parent,t)}}}createContext(e){return new pa(e)}_clearCache(){this._compiledDefinitions=null}_compile(){const e={},t=this._sourceDefinitions,o=Object.keys(t);for(const n of o)e[n]=ba(t[n],n);for(const t of o)wa(e,t);for(const t of o)ka(e,t);for(const t of o)_a(e,t),va(e,t);for(const t of o)ya(e,t),xa(e,t);this._compiledDefinitions=e}_checkContextMatch(e,t,o=t.length-1){const n=t.getItem(o);if(e.allowIn.includes(n.name)){if(0==o)return!0;{const e=this.getDefinition(n);return this._checkContextMatch(e,t,o-1)}}return!1}*_getValidRangesForRange(e,t){let o=e.start,n=e.start;for(const i of e.getItems({shallow:!0}))i.is("element")&&(yield*this._getValidRangesForRange(Es._createIn(i),t)),this.checkAttribute(i,t)||(o.isEqual(n)||(yield new Es(o,n)),o=As._createAfter(i)),n=As._createAfter(i);o.isEqual(n)||(yield new Es(o,n))}}Co(fa,qn);class pa{constructor(e){if(e instanceof pa)return e;"string"==typeof e?e=[e]:Array.isArray(e)||(e=e.getAncestors({includeSelf:!0})),e[0]&&"string"!=typeof e[0]&&e[0].is("documentFragment")&&e.shift(),this._items=e.map(Ta)}get length(){return this._items.length}get last(){return this._items[this._items.length-1]}[Symbol.iterator](){return this._items[Symbol.iterator]()}push(e){const t=new pa([e]);return t._items=[...this._items,...t._items],t}getItem(e){return this._items[e]}*getNames(){yield*this._items.map(e=>e.name)}endsWith(e){return Array.from(this.getNames()).join(" ").endsWith(e)}startsWith(e){return Array.from(this.getNames()).join(" ").startsWith(e)}}function ba(e,t){const o={name:t,allowIn:[],allowContentOf:[],allowWhere:[],allowAttributes:[],allowAttributesOf:[],inheritTypesFrom:[]};return function(e,t){for(const o of e){const e=Object.keys(o).filter(e=>e.startsWith("is"));for(const n of e)t[n]=o[n]}}(e,o),Ca(e,o,"allowIn"),Ca(e,o,"allowContentOf"),Ca(e,o,"allowWhere"),Ca(e,o,"allowAttributes"),Ca(e,o,"allowAttributesOf"),Ca(e,o,"inheritTypesFrom"),function(e,t){for(const o of e){const e=o.inheritAllFrom;e&&(t.allowContentOf.push(e),t.allowWhere.push(e),t.allowAttributesOf.push(e),t.inheritTypesFrom.push(e))}}(e,o),o}function wa(e,t){for(const o of e[t].allowContentOf)if(e[o]){Aa(e,o).forEach(e=>{e.allowIn.push(t)})}delete e[t].allowContentOf}function ka(e,t){for(const o of e[t].allowWhere){const n=e[o];if(n){const o=n.allowIn;e[t].allowIn.push(...o)}}delete e[t].allowWhere}function _a(e,t){for(const o of e[t].allowAttributesOf){const n=e[o];if(n){const o=n.allowAttributes;e[t].allowAttributes.push(...o)}}delete e[t].allowAttributesOf}function va(e,t){const o=e[t];for(const t of o.inheritTypesFrom){const n=e[t];if(n){const e=Object.keys(n).filter(e=>e.startsWith("is"));for(const t of e)t in o||(o[t]=n[t])}}delete o.inheritTypesFrom}function ya(e,t){const o=e[t],n=o.allowIn.filter(t=>e[t]);o.allowIn=Array.from(new Set(n))}function xa(e,t){const o=e[t];o.allowAttributes=Array.from(new Set(o.allowAttributes))}function Ca(e,t,o){for(const n of e)"string"==typeof n[o]?t[o].push(n[o]):Array.isArray(n[o])&&t[o].push(...n[o])}function Aa(e,t){const o=e[t];return(n=e,Object.keys(n).map(e=>n[e])).filter(e=>e.allowIn.includes(o.name));var n}function Ta(e){return"string"==typeof e?{name:e,*getAttributeKeys(){},getAttribute(){}}:{name:e.is("element")?e.name:"$text",*getAttributeKeys(){yield*e.getAttributeKeys()},getAttribute:t=>e.getAttribute(t)}}function Pa(e,t,o){for(const n of t.getAttributeKeys())e.checkAttribute(t,n)||o.removeAttribute(n,t)}class Sa{constructor(e={}){this._splitParts=new Map,this._cursorParents=new Map,this._modelCursor=null,this.conversionApi=Object.assign({},e),this.conversionApi.convertItem=this._convertItem.bind(this),this.conversionApi.convertChildren=this._convertChildren.bind(this),this.conversionApi.safeInsert=this._safeInsert.bind(this),this.conversionApi.updateConversionResult=this._updateConversionResult.bind(this),this.conversionApi.splitToAllowedParent=this._splitToAllowedParent.bind(this),this.conversionApi.getSplitParts=this._getSplitParts.bind(this)}convert(e,t,o=["$root"]){this.fire("viewCleanup",e),this._modelCursor=function(e,t){let o;for(const n of new pa(e)){const e={};for(const t of n.getAttributeKeys())e[t]=n.getAttribute(t);const i=t.createElement(n.name,e);o&&t.append(i,o),o=As._createAt(i,0)}return o}(o,t),this.conversionApi.writer=t,this.conversionApi.consumable=ma.createFrom(e),this.conversionApi.store={};const{modelRange:n}=this._convertItem(e,this._modelCursor),i=t.createDocumentFragment();if(n){this._removeEmptyElements();for(const e of Array.from(this._modelCursor.parent.getChildren()))t.append(e,i);i.markers=function(e,t){const o=new Set,n=new Map,i=Es._createIn(e).getItems();for(const e of i)"$marker"==e.name&&o.add(e);for(const e of o){const o=e.getAttribute("data-name"),i=t.createPositionBefore(e);n.has(o)?n.get(o).end=i.clone():n.set(o,new Es(i.clone())),t.remove(e)}return n}(i,t)}return this._modelCursor=null,this._splitParts.clear(),this._cursorParents.clear(),this.conversionApi.writer=null,this.conversionApi.store=null,i}_convertItem(e,t){const o=Object.assign({viewItem:e,modelCursor:t,modelRange:null});if(e.is("element")?this.fire("element:"+e.name,o,this.conversionApi):e.is("$text")?this.fire("text",o,this.conversionApi):this.fire("documentFragment",o,this.conversionApi),o.modelRange&&!(o.modelRange instanceof Es))throw new mo.b("view-conversion-dispatcher-incorrect-result: Incorrect conversion result was dropped.",this);return{modelRange:o.modelRange,modelCursor:o.modelCursor}}_convertChildren(e,t){let o=t.is("position")?t:As._createAt(t,0);const n=new Es(o);for(const t of Array.from(e.getChildren())){const e=this._convertItem(t,o);e.modelRange instanceof Es&&(n.end=e.modelRange.end,o=e.modelCursor)}return{modelRange:n,modelCursor:o}}_safeInsert(e,t){const o=this._splitToAllowedParent(e,t);return!!o&&(this.conversionApi.writer.insert(e,o.position),!0)}_updateConversionResult(e,t){const o=this._getSplitParts(e),n=this.conversionApi.writer;t.modelRange||(t.modelRange=n.createRange(n.createPositionBefore(e),n.createPositionAfter(o[o.length-1])));const i=this._cursorParents.get(e);t.modelCursor=i?n.createPositionAt(i,0):t.modelRange.end}_splitToAllowedParent(e,t){const{schema:o,writer:n}=this.conversionApi;let i=o.findAllowedParent(t,e);if(i){if(i===t.parent)return{position:t};this._modelCursor.parent.getAncestors().includes(i)&&(i=null)}if(!i)return oa(t,e,o)?{position:na(t,n)}:null;const r=this.conversionApi.writer.split(t,i),s=[];for(const e of r.range.getWalker())if("elementEnd"==e.type)s.push(e.item);else{const t=s.pop(),o=e.item;this._registerSplitPair(t,o)}const a=r.range.end.parent;return this._cursorParents.set(e,a),{position:r.position,cursorParent:a}}_registerSplitPair(e,t){this._splitParts.has(e)||this._splitParts.set(e,[e]);const o=this._splitParts.get(e);this._splitParts.set(t,o),o.push(t)}_getSplitParts(e){let t;return t=this._splitParts.has(e)?this._splitParts.get(e):[e],t}_removeEmptyElements(){let e=!1;for(const t of this._splitParts.keys())t.isEmpty&&(this.conversionApi.writer.remove(t),this._splitParts.delete(t),e=!0);e&&this._removeEmptyElements()}}Co(Sa,po);class Ea{constructor(e,t){this.model=e,this.stylesProcessor=t,this.processor,this.mapper=new Rs,this.downcastDispatcher=new Os({mapper:this.mapper,schema:e.schema}),this.downcastDispatcher.on("insert:$text",(e,t,o)=>{if(!o.consumable.consume(t.item,"insert"))return;const n=o.writer,i=o.mapper.toViewPosition(t.range.start),r=n.createText(t.item.data);n.insert(i,r)},{priority:"lowest"}),this.upcastDispatcher=new Sa({schema:e.schema}),this.viewDocument=new si(t),this._viewWriter=new Ri(this.viewDocument),this.upcastDispatcher.on("text",(e,t,{schema:o,consumable:n,writer:i})=>{let r=t.modelCursor;if(!n.test(t.viewItem))return;if(!o.checkChild(r,"$text")){if(!oa(r,"$text",o))return;r=na(r,i)}n.consume(t.viewItem);const s=i.createText(t.viewItem.data);i.insert(s,r),t.modelRange=i.createRange(r,r.getShiftedBy(s.offsetSize)),t.modelCursor=t.modelRange.end},{priority:"lowest"}),this.upcastDispatcher.on("element",(e,t,o)=>{if(!t.modelRange&&o.consumable.consume(t.viewItem,{name:!0})){const{modelRange:e,modelCursor:n}=o.convertChildren(t.viewItem,t.modelCursor);t.modelRange=e,t.modelCursor=n}},{priority:"lowest"}),this.upcastDispatcher.on("documentFragment",(e,t,o)=>{if(!t.modelRange&&o.consumable.consume(t.viewItem,{name:!0})){const{modelRange:e,modelCursor:n}=o.convertChildren(t.viewItem,t.modelCursor);t.modelRange=e,t.modelCursor=n}},{priority:"lowest"}),this.decorate("init"),this.decorate("set"),this.on("init",()=>{this.fire("ready")},{priority:"lowest"}),this.on("ready",()=>{this.model.enqueueChange("transparent",ta)},{priority:"lowest"})}get(e={}){const{rootName:t="main",trim:o="empty"}=e;if(!this._checkIfRootsExists([t]))throw new mo.b("datacontroller-get-non-existent-root: Attempting to get data from a non-existing root.",this);const n=this.model.document.getRoot(t);return"empty"!==o||this.model.hasContent(n,{ignoreWhitespaces:!0})?this.stringify(n,e):""}stringify(e,t){const o=this.toView(e,t);return this.processor.toData(o)}toView(e,t){const o=this.viewDocument,n=this._viewWriter;this.mapper.clearBindings();const i=Es._createIn(e),r=new Ei(o);if(this.mapper.bindElements(e,r),this.downcastDispatcher.conversionApi.options=t,this.downcastDispatcher.convertInsert(i,n),!e.is("documentFragment")){const t=function(e){const t=[],o=e.root.document;if(!o)return[];const n=Es._createIn(e);for(const e of o.model.markers){const o=n.getIntersection(e.getRange());o&&t.push([e.name,o])}return t}(e);for(const[e,o]of t)this.downcastDispatcher.convertMarkerAdd(e,o,n)}return delete this.downcastDispatcher.conversionApi.options,r}init(e){if(this.model.document.version)throw new mo.b("datacontroller-init-document-not-empty: Trying to set initial data to not empty document.",this);let t={};if("string"==typeof e?t.main=e:t=e,!this._checkIfRootsExists(Object.keys(t)))throw new mo.b("datacontroller-init-non-existent-root: Attempting to init data on a non-existing root.",this);return this.model.enqueueChange("transparent",e=>{for(const o of Object.keys(t)){const n=this.model.document.getRoot(o);e.insert(this.parse(t[o],n),n,0)}}),Promise.resolve()}set(e){let t={};if("string"==typeof e?t.main=e:t=e,!this._checkIfRootsExists(Object.keys(t)))throw new mo.b("datacontroller-set-non-existent-root: Attempting to set data on a non-existing root.",this);this.model.enqueueChange("transparent",e=>{e.setSelection(null),e.removeSelectionAttribute(this.model.document.selection.getAttributeKeys());for(const o of Object.keys(t)){const n=this.model.document.getRoot(o);e.remove(e.createRangeIn(n)),e.insert(this.parse(t[o],n),n,0)}})}parse(e,t="$root"){const o=this.processor.toView(e);return this.toModel(o,t)}toModel(e,t="$root"){return this.model.change(o=>this.upcastDispatcher.convert(e,o,t))}addStyleProcessorRules(e){e(this.stylesProcessor)}destroy(){this.stopListening()}_checkIfRootsExists(e){for(const t of e)if(!this.model.document.getRootNames().includes(t))return!1;return!0}}Co(Ea,qn);class Ra{constructor(e,t){this._helpers=new Map,this._downcast=Array.isArray(e)?e:[e],this._createConversionHelpers({name:"downcast",dispatchers:this._downcast,isDowncast:!0}),this._upcast=Array.isArray(t)?t:[t],this._createConversionHelpers({name:"upcast",dispatchers:this._upcast,isDowncast:!1})}addAlias(e,t){const o=this._downcast.includes(t);if(!this._upcast.includes(t)&&!o)throw new mo.b("conversion-add-alias-dispatcher-not-registered: Trying to register and alias for a dispatcher that nas not been registered.",this);this._createConversionHelpers({name:e,dispatchers:[t],isDowncast:o})}for(e){if(!this._helpers.has(e))throw new mo.b("conversion-for-unknown-group: Trying to add a converter to an unknown dispatchers group.",this);return this._helpers.get(e)}elementToElement(e){this.for("downcast").elementToElement(e);for(const{model:t,view:o}of Ia(e))this.for("upcast").elementToElement({model:t,view:o,converterPriority:e.converterPriority})}attributeToElement(e){this.for("downcast").attributeToElement(e);for(const{model:t,view:o}of Ia(e))this.for("upcast").elementToAttribute({view:o,model:t,converterPriority:e.converterPriority})}attributeToAttribute(e){this.for("downcast").attributeToAttribute(e);for(const{model:t,view:o}of Ia(e))this.for("upcast").attributeToAttribute({view:o,model:t})}_createConversionHelpers({name:e,dispatchers:t,isDowncast:o}){if(this._helpers.has(e))throw new mo.b("conversion-group-exists: Trying to register a group name that has already been registered.",this);const n=o?new Ks(t):new ia(t);this._helpers.set(e,n)}}function*Ia(e){if(e.model.values)for(const t of e.model.values){const o={key:e.model.key,value:t},n=e.view[t],i=e.upcastAlso?e.upcastAlso[t]:void 0;yield*Va(o,n,i)}else yield*Va(e.model,e.view,e.upcastAlso)}function*Va(e,t,o){if(yield{model:e,view:t},o){o=Array.isArray(o)?o:[o];for(const t of o)yield{model:e,view:t}}}class Oa{constructor(e="default"){this.operations=[],this.type=e}get baseVersion(){for(const e of this.operations)if(null!==e.baseVersion)return e.baseVersion;return null}addOperation(e){return e.batch=this,this.operations.push(e),e}}class Ma{constructor(e){this.baseVersion=e,this.isDocumentOperation=null!==this.baseVersion,this.batch=null}_validate(){}toJSON(){const e=Object.assign({},this);return e.__className=this.constructor.className,delete e.batch,delete e.isDocumentOperation,e}static get className(){return"Operation"}static fromJSON(e){return new this(e.baseVersion)}}class Na{constructor(e){this.markers=new Map,this._children=new vs,e&&this._insertChild(0,e)}[Symbol.iterator](){return this.getChildren()}get childCount(){return this._children.length}get maxOffset(){return this._children.maxOffset}get isEmpty(){return 0===this.childCount}get root(){return this}get parent(){return null}is(e){return"documentFragment"===e||"model:documentFragment"===e}getChild(e){return this._children.getNode(e)}getChildren(){return this._children[Symbol.iterator]()}getChildIndex(e){return this._children.getNodeIndex(e)}getChildStartOffset(e){return this._children.getNodeStartOffset(e)}getPath(){return[]}getNodeByPath(e){let t=this;for(const o of e)t=t.getChild(t.offsetToIndex(o));return t}offsetToIndex(e){return this._children.offsetToIndex(e)}toJSON(){const e=[];for(const t of this._children)e.push(t.toJSON());return e}static fromJSON(e){const t=[];for(const o of e)o.name?t.push(ys.fromJSON(o)):t.push(ks.fromJSON(o));return new Na(t)}_appendChild(e){this._insertChild(this.childCount,e)}_insertChild(e,t){const o=function(e){if("string"==typeof e)return[new ks(e)];xo(e)||(e=[e]);return Array.from(e).map(e=>"string"==typeof e?new ks(e):e instanceof _s?new ks(e.data,e.getAttributes()):e)}(t);for(const e of o)null!==e.parent&&e._remove(),e.parent=this;this._children._insertNodes(e,o)}_removeChildren(e,t=1){const o=this._children._removeNodes(e,t);for(const e of o)e.parent=null;return o}}function za(e,t){const o=(t=Da(t)).reduce((e,t)=>e+t.offsetSize,0),n=e.parent;Ha(e);const i=e.index;return n._insertChild(i,t),La(n,i+t.length),La(n,i),new Es(e,e.getShiftedBy(o))}function Ba(e){if(!e.isFlat)throw new mo.b("operation-utils-remove-range-not-flat: Trying to remove a range which starts and ends in different element.",this);const t=e.start.parent;Ha(e.start),Ha(e.end);const o=t._removeChildren(e.start.index,e.end.index-e.start.index);return La(t,e.start.index),o}function Fa(e,t){if(!e.isFlat)throw new mo.b("operation-utils-move-range-not-flat: Trying to move a range which starts and ends in different element.",this);const o=Ba(e);return za(t=t._getTransformedByDeletion(e.start,e.end.offset-e.start.offset),o)}function Da(e){const t=[];e instanceof Array||(e=[e]);for(let o=0;oe.maxOffset)throw new mo.b("move-operation-nodes-do-not-exist: The nodes which should be moved do not exist.",this);if(e===t&&o=o&&this.targetPosition.path[e]e._clone(!0))),t=new Ga(this.position,e,this.baseVersion);return t.shouldReceiveAttributes=this.shouldReceiveAttributes,t}getReversed(){const e=this.position.root.document.graveyard,t=new As(e,[0]);return new Ua(this.position,this.nodes.maxOffset,t,this.baseVersion+1)}_validate(){const e=this.position.parent;if(!e||e.maxOffsete._clone(!0))),za(this.position,e)}toJSON(){const e=super.toJSON();return e.position=this.position.toJSON(),e.nodes=this.nodes.toJSON(),e}static get className(){return"InsertOperation"}static fromJSON(e,t){const o=[];for(const t of e.nodes)t.name?o.push(ys.fromJSON(t)):o.push(ks.fromJSON(t));const n=new Ga(As.fromJSON(e.position,t),o,e.baseVersion);return n.shouldReceiveAttributes=e.shouldReceiveAttributes,n}}class Ka extends Ma{constructor(e,t,o,n,i,r){super(r),this.name=e,this.oldRange=t?t.clone():null,this.newRange=o?o.clone():null,this.affectsData=i,this._markers=n}get type(){return"marker"}clone(){return new Ka(this.name,this.oldRange,this.newRange,this._markers,this.affectsData,this.baseVersion)}getReversed(){return new Ka(this.name,this.newRange,this.oldRange,this._markers,this.affectsData,this.baseVersion+1)}_execute(){const e=this.newRange?"_set":"_remove";this._markers[e](this.name,this.newRange,!0,this.affectsData)}toJSON(){const e=super.toJSON();return this.oldRange&&(e.oldRange=this.oldRange.toJSON()),this.newRange&&(e.newRange=this.newRange.toJSON()),delete e._markers,e}static get className(){return"MarkerOperation"}static fromJSON(e,t){return new Ka(e.name,e.oldRange?Es.fromJSON(e.oldRange,t):null,e.newRange?Es.fromJSON(e.newRange,t):null,t.model.markers,e.affectsData,e.baseVersion)}}class Ja extends Ma{constructor(e,t,o,n){super(n),this.position=e,this.position.stickiness="toNext",this.oldName=t,this.newName=o}get type(){return"rename"}clone(){return new Ja(this.position.clone(),this.oldName,this.newName,this.baseVersion)}getReversed(){return new Ja(this.position.clone(),this.newName,this.oldName,this.baseVersion+1)}_validate(){const e=this.position.nodeAfter;if(!(e instanceof ys))throw new mo.b("rename-operation-wrong-position: Given position is invalid or node after it is not an instance of Element.",this);if(e.name!==this.oldName)throw new mo.b("rename-operation-wrong-name: Element to change has different name than operation's old name.",this)}_execute(){this.position.nodeAfter.name=this.newName}toJSON(){const e=super.toJSON();return e.position=this.position.toJSON(),e}static get className(){return"RenameOperation"}static fromJSON(e,t){return new Ja(As.fromJSON(e.position,t),e.oldName,e.newName,e.baseVersion)}}class Ya extends Ma{constructor(e,t,o,n,i){super(i),this.root=e,this.key=t,this.oldValue=o,this.newValue=n}get type(){return null===this.oldValue?"addRootAttribute":null===this.newValue?"removeRootAttribute":"changeRootAttribute"}clone(){return new Ya(this.root,this.key,this.oldValue,this.newValue,this.baseVersion)}getReversed(){return new Ya(this.root,this.key,this.newValue,this.oldValue,this.baseVersion+1)}_validate(){if(this.root!=this.root.root||this.root.is("documentFragment"))throw new mo.b("rootattribute-operation-not-a-root: The element to change is not a root element.",this,{root:this.root,key:this.key});if(null!==this.oldValue&&this.root.getAttribute(this.key)!==this.oldValue)throw new mo.b("rootattribute-operation-wrong-old-value: Changed node has different attribute value than operation's old attribute value.",this,{root:this.root,key:this.key});if(null===this.oldValue&&null!==this.newValue&&this.root.hasAttribute(this.key))throw new mo.b("rootattribute-operation-attribute-exists: The attribute with given key already exists.",this,{root:this.root,key:this.key})}_execute(){null!==this.newValue?this.root._setAttribute(this.key,this.newValue):this.root._removeAttribute(this.key)}toJSON(){const e=super.toJSON();return e.root=this.root.toJSON(),e}static get className(){return"RootAttributeOperation"}static fromJSON(e,t){if(!t.getRoot(e.root))throw new mo.b("rootattribute-operation-fromjson-no-root: Cannot create RootAttributeOperation. Root with specified name does not exist.",this,{rootName:e.root});return new Ya(t.getRoot(e.root),e.key,e.oldValue,e.newValue,e.baseVersion)}}class Qa extends Ma{constructor(e,t,o,n,i){super(i),this.sourcePosition=e.clone(),this.sourcePosition.stickiness="toPrevious",this.howMany=t,this.targetPosition=o.clone(),this.targetPosition.stickiness="toNext",this.graveyardPosition=n.clone()}get type(){return"merge"}get deletionPosition(){return new As(this.sourcePosition.root,this.sourcePosition.path.slice(0,-1))}get movedRange(){const e=this.sourcePosition.getShiftedBy(Number.POSITIVE_INFINITY);return new Es(this.sourcePosition,e)}clone(){return new this.constructor(this.sourcePosition,this.howMany,this.targetPosition,this.graveyardPosition,this.baseVersion)}getReversed(){const e=this.targetPosition._getTransformedByMergeOperation(this),t=this.sourcePosition.path.slice(0,-1),o=new As(this.sourcePosition.root,t)._getTransformedByMergeOperation(this),n=new Xa(e,this.howMany,this.graveyardPosition,this.baseVersion+1);return n.insertionPosition=o,n}_validate(){const e=this.sourcePosition.parent,t=this.targetPosition.parent;if(!e.parent)throw new mo.b("merge-operation-source-position-invalid: Merge source position is invalid.",this);if(!t.parent)throw new mo.b("merge-operation-target-position-invalid: Merge target position is invalid.",this);if(this.howMany!=e.maxOffset)throw new mo.b("merge-operation-how-many-invalid: Merge operation specifies wrong number of nodes to move.",this)}_execute(){const e=this.sourcePosition.parent;Fa(Es._createIn(e),this.targetPosition),Fa(Es._createOn(e),this.graveyardPosition)}toJSON(){const e=super.toJSON();return e.sourcePosition=e.sourcePosition.toJSON(),e.targetPosition=e.targetPosition.toJSON(),e.graveyardPosition=e.graveyardPosition.toJSON(),e}static get className(){return"MergeOperation"}static fromJSON(e,t){const o=As.fromJSON(e.sourcePosition,t),n=As.fromJSON(e.targetPosition,t),i=As.fromJSON(e.graveyardPosition,t);return new this(o,e.howMany,n,i,e.baseVersion)}}class Xa extends Ma{constructor(e,t,o,n){super(n),this.splitPosition=e.clone(),this.splitPosition.stickiness="toNext",this.howMany=t,this.insertionPosition=Xa.getInsertionPosition(e),this.insertionPosition.stickiness="toNone",this.graveyardPosition=o?o.clone():null,this.graveyardPosition&&(this.graveyardPosition.stickiness="toNext")}get type(){return"split"}get moveTargetPosition(){const e=this.insertionPosition.path.slice();return e.push(0),new As(this.insertionPosition.root,e)}get movedRange(){const e=this.splitPosition.getShiftedBy(Number.POSITIVE_INFINITY);return new Es(this.splitPosition,e)}clone(){const e=new this.constructor(this.splitPosition,this.howMany,this.graveyardPosition,this.baseVersion);return e.insertionPosition=this.insertionPosition,e}getReversed(){const e=this.splitPosition.root.document.graveyard,t=new As(e,[0]);return new Qa(this.moveTargetPosition,this.howMany,this.splitPosition,t,this.baseVersion+1)}_validate(){const e=this.splitPosition.parent,t=this.splitPosition.offset;if(!e||e.maxOffset{for(const t of e.getAttributeKeys())this.removeAttribute(t,e)};if(e instanceof Es)for(const o of e.getItems())t(o);else t(e)}move(e,t,o){if(this._assertWriterUsedCorrectly(),!(e instanceof Es))throw new mo.b("writer-move-invalid-range: Invalid range to move.",this);if(!e.isFlat)throw new mo.b("writer-move-range-not-flat: Range to move is not flat.",this);const n=As._createAt(t,o);if(n.isEqual(e.start))return;if(this._addOperationForAffectedMarkers("move",e),!rl(e.root,n.root))throw new mo.b("writer-move-different-document: Range is going to be moved between different documents.",this);const i=e.root.document?e.root.document.version:null,r=new Ua(e.start,e.end.offset-e.start.offset,n,i);this.batch.addOperation(r),this.model.applyOperation(r)}remove(e){this._assertWriterUsedCorrectly();const t=(e instanceof Es?e:Es._createOn(e)).getMinimalFlatRanges().reverse();for(const e of t)this._addOperationForAffectedMarkers("move",e),il(e.start,e.end.offset-e.start.offset,this.batch,this.model)}merge(e){this._assertWriterUsedCorrectly();const t=e.nodeBefore,o=e.nodeAfter;if(this._addOperationForAffectedMarkers("merge",e),!(t instanceof ys))throw new mo.b("writer-merge-no-element-before: Node before merge position must be an element.",this);if(!(o instanceof ys))throw new mo.b("writer-merge-no-element-after: Node after merge position must be an element.",this);e.root.document?this._merge(e):this._mergeDetached(e)}createPositionFromPath(e,t,o){return this.model.createPositionFromPath(e,t,o)}createPositionAt(e,t){return this.model.createPositionAt(e,t)}createPositionAfter(e){return this.model.createPositionAfter(e)}createPositionBefore(e){return this.model.createPositionBefore(e)}createRange(e,t){return this.model.createRange(e,t)}createRangeIn(e){return this.model.createRangeIn(e)}createRangeOn(e){return this.model.createRangeOn(e)}createSelection(e,t,o){return this.model.createSelection(e,t,o)}_mergeDetached(e){const t=e.nodeBefore,o=e.nodeAfter;this.move(Es._createIn(o),As._createAt(t,"end")),this.remove(o)}_merge(e){const t=As._createAt(e.nodeBefore,"end"),o=As._createAt(e.nodeAfter,0),n=e.root.document.graveyard,i=new As(n,[0]),r=e.root.document.version,s=new Qa(o,e.nodeAfter.maxOffset,t,i,r);this.batch.addOperation(s),this.model.applyOperation(s)}rename(e,t){if(this._assertWriterUsedCorrectly(),!(e instanceof ys))throw new mo.b("writer-rename-not-element-instance: Trying to rename an object which is not an instance of Element.",this);const o=e.root.document?e.root.document.version:null,n=new Ja(As._createBefore(e),e.name,t,o);this.batch.addOperation(n),this.model.applyOperation(n)}split(e,t){this._assertWriterUsedCorrectly();let o,n,i=e.parent;if(!i.parent)throw new mo.b("writer-split-element-no-parent: Element with no parent can not be split.",this);if(t||(t=i.parent),!e.parent.getAncestors({includeSelf:!0}).includes(t))throw new mo.b("writer-split-invalid-limit-element: Limit element is not a position ancestor.",this);do{const t=i.root.document?i.root.document.version:null,r=i.maxOffset-e.offset,s=new Xa(e,r,null,t);this.batch.addOperation(s),this.model.applyOperation(s),o||n||(o=i,n=e.parent.nextSibling),i=(e=this.createPositionAfter(e.parent)).parent}while(i!==t);return{position:e,range:new Es(As._createAt(o,"end"),As._createAt(n,0))}}wrap(e,t){if(this._assertWriterUsedCorrectly(),!e.isFlat)throw new mo.b("writer-wrap-range-not-flat: Range to wrap is not flat.",this);const o=t instanceof ys?t:new ys(t);if(o.childCount>0)throw new mo.b("writer-wrap-element-not-empty: Element to wrap with is not empty.",this);if(null!==o.parent)throw new mo.b("writer-wrap-element-attached: Element to wrap with is already attached to tree model.",this);this.insert(o,e.start);const n=new Es(e.start.getShiftedBy(1),e.end.getShiftedBy(1));this.move(n,As._createAt(o,0))}unwrap(e){if(this._assertWriterUsedCorrectly(),null===e.parent)throw new mo.b("writer-unwrap-element-no-parent: Trying to unwrap an element which has no parent.",this);this.move(Es._createIn(e),this.createPositionAfter(e)),this.remove(e)}addMarker(e,t){if(this._assertWriterUsedCorrectly(),!t||"boolean"!=typeof t.usingOperation)throw new mo.b("writer-addMarker-no-usingOperation: The options.usingOperation parameter is required when adding a new marker.",this);const o=t.usingOperation,n=t.range,i=void 0!==t.affectsData&&t.affectsData;if(this.model.markers.has(e))throw new mo.b("writer-addMarker-marker-exists: Marker with provided name already exists.",this);if(!n)throw new mo.b("writer-addMarker-no-range: Range parameter is required when adding a new marker.",this);return o?(nl(this,e,null,n,i),this.model.markers.get(e)):this.model.markers._set(e,n,o,i)}updateMarker(e,t){this._assertWriterUsedCorrectly();const o="string"==typeof e?e:e.name,n=this.model.markers.get(o);if(!n)throw new mo.b("writer-updateMarker-marker-not-exists: Marker with provided name does not exists.",this);if(!t)return void this.model.markers._refresh(n);const i="boolean"==typeof t.usingOperation,r="boolean"==typeof t.affectsData,s=r?t.affectsData:n.affectsData;if(!i&&!t.range&&!r)throw new mo.b("writer-updateMarker-wrong-options: One of the options is required - provide range, usingOperations or affectsData.",this);const a=n.getRange(),l=t.range?t.range:a;i&&t.usingOperation!==n.managedUsingOperations?t.usingOperation?nl(this,o,null,l,s):(nl(this,o,a,null,s),this.model.markers._set(o,l,void 0,s)):n.managedUsingOperations?nl(this,o,a,l,s):this.model.markers._set(o,l,void 0,s)}removeMarker(e){this._assertWriterUsedCorrectly();const t="string"==typeof e?e:e.name;if(!this.model.markers.has(t))throw new mo.b("writer-removeMarker-no-marker: Trying to remove marker which does not exist.",this);const o=this.model.markers.get(t);if(!o.managedUsingOperations)return void this.model.markers._remove(t);nl(this,t,o.getRange(),null,o.affectsData)}setSelection(e,t,o){this._assertWriterUsedCorrectly(),this.model.document.selection._setTo(e,t,o)}setSelectionFocus(e,t){this._assertWriterUsedCorrectly(),this.model.document.selection._setFocus(e,t)}setSelectionAttribute(e,t){if(this._assertWriterUsedCorrectly(),"string"==typeof e)this._setSelectionAttribute(e,t);else for(const[t,o]of Bo(e))this._setSelectionAttribute(t,o)}removeSelectionAttribute(e){if(this._assertWriterUsedCorrectly(),"string"==typeof e)this._removeSelectionAttribute(e);else for(const t of e)this._removeSelectionAttribute(t)}overrideSelectionGravity(){return this.model.document.selection._overrideGravity()}restoreSelectionGravity(e){this.model.document.selection._restoreGravity(e)}_setSelectionAttribute(e,t){const o=this.model.document.selection;if(o.isCollapsed&&o.anchor.parent.isEmpty){const n=Ws._getStoreAttributeKey(e);this.setAttribute(n,t,o.anchor.parent)}o._setAttribute(e,t)}_removeSelectionAttribute(e){const t=this.model.document.selection;if(t.isCollapsed&&t.anchor.parent.isEmpty){const o=Ws._getStoreAttributeKey(e);this.removeAttribute(o,t.anchor.parent)}t._removeAttribute(e)}_assertWriterUsedCorrectly(){if(this.model._currentWriter!==this)throw new mo.b("writer-incorrect-use: Trying to use a writer outside the change() block.",this)}_addOperationForAffectedMarkers(e,t){for(const o of this.model.markers){if(!o.managedUsingOperations)continue;const n=o.getRange();let i=!1;if("move"===e)i=t.containsPosition(n.start)||t.start.isEqual(n.start)||t.containsPosition(n.end)||t.end.isEqual(n.end);else{const e=t.nodeBefore,o=t.nodeAfter,r=n.start.parent==e&&n.start.isAtEnd,s=n.end.parent==o&&0==n.end.offset,a=n.end.nodeAfter==o,l=n.start.nodeAfter==o;i=r||s||a||l}i&&this.updateMarker(o.name,{range:n})}}}function tl(e,t,o,n){const i=e.model,r=i.document;let s,a,l,c=n.start;for(const e of n.getWalker({shallow:!0}))l=e.item.getAttribute(t),s&&a!=l&&(a!=o&&d(),c=s),s=e.nextPosition,a=l;function d(){const n=new Es(c,s),l=n.root.document?r.version:null,d=new qa(n,t,a,o,l);e.batch.addOperation(d),i.applyOperation(d)}s instanceof As&&s!=c&&a!=o&&d()}function ol(e,t,o,n){const i=e.model,r=i.document,s=n.getAttribute(t);let a,l;if(s!=o){if(n.root===n){const e=n.document?r.version:null;l=new Ya(n,t,s,o,e)}else{a=new Es(As._createBefore(n),e.createPositionAfter(n));const i=a.root.document?r.version:null;l=new qa(a,t,s,o,i)}e.batch.addOperation(l),i.applyOperation(l)}}function nl(e,t,o,n,i){const r=e.model,s=r.document,a=new Ka(t,o,n,r.markers,i,s.version);e.batch.addOperation(a),r.applyOperation(a)}function il(e,t,o,n){let i;if(e.root.document){const o=n.document,r=new As(o.graveyard,[0]);i=new Ua(e,t,r,o.version)}else i=new $a(e,t);o.addOperation(i),n.applyOperation(i)}function rl(e,t){return e===t||e instanceof Za&&t instanceof Za}class sl{constructor(e){this._markerCollection=e,this._changesInElement=new Map,this._elementSnapshots=new Map,this._changedMarkers=new Map,this._changeCount=0,this._cachedChanges=null,this._cachedChangesWithGraveyard=null}get isEmpty(){return 0==this._changesInElement.size&&0==this._changedMarkers.size}refreshItem(e){if(this._isInInsertedElement(e.parent))return;this._markRemove(e.parent,e.startOffset,e.offsetSize),this._markInsert(e.parent,e.startOffset,e.offsetSize);const t=Es._createOn(e);for(const e of this._markerCollection.getMarkersIntersectingRange(t)){const t=e.getRange();this.bufferMarkerChange(e.name,t,t,e.affectsData)}this._cachedChanges=null}bufferOperation(e){switch(e.type){case"insert":if(this._isInInsertedElement(e.position.parent))return;this._markInsert(e.position.parent,e.position.offset,e.nodes.maxOffset);break;case"addAttribute":case"removeAttribute":case"changeAttribute":for(const t of e.range.getItems({shallow:!0}))this._isInInsertedElement(t.parent)||this._markAttribute(t);break;case"remove":case"move":case"reinsert":{if(e.sourcePosition.isEqual(e.targetPosition)||e.sourcePosition.getShiftedBy(e.howMany).isEqual(e.targetPosition))return;const t=this._isInInsertedElement(e.sourcePosition.parent),o=this._isInInsertedElement(e.targetPosition.parent);t||this._markRemove(e.sourcePosition.parent,e.sourcePosition.offset,e.howMany),o||this._markInsert(e.targetPosition.parent,e.getMovedRangeStart().offset,e.howMany);break}case"rename":{if(this._isInInsertedElement(e.position.parent))return;this._markRemove(e.position.parent,e.position.offset,1),this._markInsert(e.position.parent,e.position.offset,1);const t=Es._createFromPositionAndShift(e.position,1);for(const e of this._markerCollection.getMarkersIntersectingRange(t)){const t=e.getRange();this.bufferMarkerChange(e.name,t,t,e.affectsData)}break}case"split":{const t=e.splitPosition.parent;this._isInInsertedElement(t)||this._markRemove(t,e.splitPosition.offset,e.howMany),this._isInInsertedElement(e.insertionPosition.parent)||this._markInsert(e.insertionPosition.parent,e.insertionPosition.offset,1),e.graveyardPosition&&this._markRemove(e.graveyardPosition.parent,e.graveyardPosition.offset,1);break}case"merge":{const t=e.sourcePosition.parent;this._isInInsertedElement(t.parent)||this._markRemove(t.parent,t.startOffset,1);const o=e.graveyardPosition.parent;this._markInsert(o,e.graveyardPosition.offset,1);const n=e.targetPosition.parent;this._isInInsertedElement(n)||this._markInsert(n,e.targetPosition.offset,t.maxOffset);break}}this._cachedChanges=null}bufferMarkerChange(e,t,o,n){const i=this._changedMarkers.get(e);i?(i.newRange=o,i.affectsData=n,null==i.oldRange&&null==i.newRange&&this._changedMarkers.delete(e)):this._changedMarkers.set(e,{oldRange:t,newRange:o,affectsData:n})}getMarkersToRemove(){const e=[];for(const[t,o]of this._changedMarkers)null!=o.oldRange&&e.push({name:t,range:o.oldRange});return e}getMarkersToAdd(){const e=[];for(const[t,o]of this._changedMarkers)null!=o.newRange&&e.push({name:t,range:o.newRange});return e}getChangedMarkers(){return Array.from(this._changedMarkers).map(e=>({name:e[0],data:{oldRange:e[1].oldRange,newRange:e[1].newRange}}))}hasDataChanges(){for(const[,e]of this._changedMarkers)if(e.affectsData)return!0;return this._changesInElement.size>0}getChanges(e={includeChangesInGraveyard:!1}){if(this._cachedChanges)return e.includeChangesInGraveyard?this._cachedChangesWithGraveyard.slice():this._cachedChanges.slice();const t=[];for(const e of this._changesInElement.keys()){const o=this._changesInElement.get(e).sort((e,t)=>e.offset===t.offset?e.type!=t.type?"remove"==e.type?-1:1:0:e.offsete.position.root!=t.position.root?e.position.root.rootNameo.offset){if(n>i){const e={type:"attribute",offset:i,howMany:n-i,count:this._changeCount++};this._handleChange(e,t),t.push(e)}e.nodesToHandle=o.offset-e.offset,e.howMany=e.nodesToHandle}else e.offset>=o.offset&&e.offseti?(e.nodesToHandle=n-i,e.offset=i):e.nodesToHandle=0);if("remove"==o.type&&e.offseto.offset){const i={type:"attribute",offset:o.offset,howMany:n-o.offset,count:this._changeCount++};this._handleChange(i,t),t.push(i),e.nodesToHandle=o.offset-e.offset,e.howMany=e.nodesToHandle}"attribute"==o.type&&(e.offset>=o.offset&&n<=i?(e.nodesToHandle=0,e.howMany=0,e.offset=0):e.offset<=o.offset&&n>=i&&(o.howMany=0))}}e.howMany=e.nodesToHandle,delete e.nodesToHandle}_getInsertDiff(e,t,o){return{type:"insert",position:As._createAt(e,t),name:o,length:1,changeCount:this._changeCount++}}_getRemoveDiff(e,t,o){return{type:"remove",position:As._createAt(e,t),name:o,length:1,changeCount:this._changeCount++}}_getAttributesDiff(e,t,o){const n=[];o=new Map(o);for(const[i,r]of t){const t=o.has(i)?o.get(i):null;t!==r&&n.push({type:"attribute",position:e.start,range:e.clone(),length:1,attributeKey:i,attributeOldValue:r,attributeNewValue:t,changeCount:this._changeCount++}),o.delete(i)}for(const[t,i]of o)n.push({type:"attribute",position:e.start,range:e.clone(),length:1,attributeKey:t,attributeOldValue:null,attributeNewValue:i,changeCount:this._changeCount++});return n}_isInInsertedElement(e){const t=e.parent;if(!t)return!1;const o=this._changesInElement.get(t),n=e.startOffset;if(o)for(const e of o)if("insert"==e.type&&n>=e.offset&&nn){for(let t=0;t{const o=t[0];if(o.isDocumentOperation&&o.baseVersion!==this.version)throw new mo.b("model-document-applyOperation-wrong-version: Only operations with matching versions can be applied.",this,{operation:o})},{priority:"highest"}),this.listenTo(e,"applyOperation",(e,t)=>{const o=t[0];o.isDocumentOperation&&this.differ.bufferOperation(o)},{priority:"high"}),this.listenTo(e,"applyOperation",(e,t)=>{const o=t[0];o.isDocumentOperation&&(this.version++,this.history.addOperation(o))},{priority:"low"}),this.listenTo(this.selection,"change",()=>{this._hasSelectionChangedFromTheLastChangeBlock=!0}),this.listenTo(e.markers,"update",(e,t,o,n)=>{this.differ.bufferMarkerChange(t.name,o,n,t.affectsData),null===o&&t.on("change",(e,o)=>{this.differ.bufferMarkerChange(t.name,o,t.getRange(),t.affectsData)})})}get graveyard(){return this.getRoot("$graveyard")}createRoot(e="$root",t="main"){if(this.roots.get(t))throw new mo.b("model-document-createRoot-name-exists: Root with specified name already exists.",this,{name:t});const o=new Za(this,e,t);return this.roots.add(o),o}destroy(){this.selection.destroy(),this.stopListening()}getRoot(e="main"){return this.roots.get(e)}getRootNames(){return Array.from(this.roots,e=>e.rootName).filter(e=>"$graveyard"!=e)}registerPostFixer(e){this._postFixers.add(e)}toJSON(){const e=Oo(this);return e.selection="[engine.model.DocumentSelection]",e.model="[engine.model.Model]",e}_handleChangeBlock(e){this._hasDocumentChangedFromTheLastChangeBlock()&&(this._callPostFixers(e),this.selection.refresh(),this.differ.hasDataChanges()?this.fire("change:data",e.batch):this.fire("change",e.batch),this.selection.refresh(),this.differ.reset()),this._hasSelectionChangedFromTheLastChangeBlock=!1}_hasDocumentChangedFromTheLastChangeBlock(){return!this.differ.isEmpty||this._hasSelectionChangedFromTheLastChangeBlock}_getDefaultRoot(){for(const e of this.roots)if(e!==this.graveyard)return e;return this.graveyard}_getDefaultRange(){const e=this._getDefaultRoot(),t=this.model,o=t.schema,n=t.createPositionFromPath(e,[0]);return o.getNearestSelectionRange(n)||t.createRange(n)}_validateSelectionRange(e){return gl(e.start)&&gl(e.end)}_callPostFixers(e){let t=!1;do{for(const o of this._postFixers)if(this.selection.refresh(),t=o(e),t)break}while(t)}}function gl(e){const t=e.textNode;if(t){const o=t.data,n=e.offset-t.startOffset;return!hl(o,n)&&!ul(o,n)}return!0}Co(ml,po);class fl{constructor(){this._markers=new Map}[Symbol.iterator](){return this._markers.values()}has(e){return this._markers.has(e)}get(e){return this._markers.get(e)||null}_set(e,t,o=!1,n=!1){const i=e instanceof pl?e.name:e;if(i.includes(","))throw new mo.b('markercollection-incorrect-marker-name: Marker name cannot contain the "," character.',this);const r=this._markers.get(i);if(r){const e=r.getRange();let s=!1;return e.isEqual(t)||(r._attachLiveRange(Ls.fromRange(t)),s=!0),o!=r.managedUsingOperations&&(r._managedUsingOperations=o,s=!0),"boolean"==typeof n&&n!=r.affectsData&&(r._affectsData=n,s=!0),s&&this.fire("update:"+i,r,e,t),r}const s=Ls.fromRange(t),a=new pl(i,s,o,n);return this._markers.set(i,a),this.fire("update:"+i,a,null,t),a}_remove(e){const t=e instanceof pl?e.name:e,o=this._markers.get(t);return!!o&&(this._markers.delete(t),this.fire("update:"+t,o,o.getRange(),null),this._destroyMarker(o),!0)}_refresh(e){const t=e instanceof pl?e.name:e,o=this._markers.get(t);if(!o)throw new mo.b("markercollection-refresh-marker-not-exists: Marker with provided name does not exists.",this);const n=o.getRange();this.fire("update:"+t,o,n,n,o.managedUsingOperations,o.affectsData)}*getMarkersAtPosition(e){for(const t of this)t.getRange().containsPosition(e)&&(yield t)}*getMarkersIntersectingRange(e){for(const t of this)null!==t.getRange().getIntersection(e)&&(yield t)}destroy(){for(const e of this._markers.values())this._destroyMarker(e);this._markers=null,this.stopListening()}*getMarkersGroup(e){for(const t of this._markers.values())t.name.startsWith(e+":")&&(yield t)}_destroyMarker(e){e.stopListening(),e._detachLiveRange()}}Co(fl,po);class pl{constructor(e,t,o,n){this.name=e,this._liveRange=this._attachLiveRange(t),this._managedUsingOperations=o,this._affectsData=n}get managedUsingOperations(){if(!this._liveRange)throw new mo.b("marker-destroyed: Cannot use a destroyed marker instance.",this);return this._managedUsingOperations}get affectsData(){if(!this._liveRange)throw new mo.b("marker-destroyed: Cannot use a destroyed marker instance.",this);return this._affectsData}getStart(){if(!this._liveRange)throw new mo.b("marker-destroyed: Cannot use a destroyed marker instance.",this);return this._liveRange.start.clone()}getEnd(){if(!this._liveRange)throw new mo.b("marker-destroyed: Cannot use a destroyed marker instance.",this);return this._liveRange.end.clone()}getRange(){if(!this._liveRange)throw new mo.b("marker-destroyed: Cannot use a destroyed marker instance.",this);return this._liveRange.toRange()}is(e){return"marker"===e||"model:marker"===e}_attachLiveRange(e){return this._liveRange&&this._detachLiveRange(),e.delegate("change:range").to(this),e.delegate("change:content").to(this),this._liveRange=e,e}_detachLiveRange(){this._liveRange.stopDelegating("change:range",this),this._liveRange.stopDelegating("change:content",this),this._liveRange.detach(),this._liveRange=null}}Co(pl,po);class bl extends Ma{get type(){return"noop"}clone(){return new bl(this.baseVersion)}getReversed(){return new bl(this.baseVersion+1)}_execute(){}static get className(){return"NoOperation"}}const wl={};wl[qa.className]=qa,wl[Ga.className]=Ga,wl[Ka.className]=Ka,wl[Ua.className]=Ua,wl[bl.className]=bl,wl[Ma.className]=Ma,wl[Ja.className]=Ja,wl[Ya.className]=Ya,wl[Xa.className]=Xa,wl[Qa.className]=Qa;class kl extends As{constructor(e,t,o="toNone"){if(super(e,t,o),!this.root.is("rootElement"))throw new mo.b("model-liveposition-root-not-rootelement: LivePosition's root has to be an instance of RootElement.",e);_l.call(this)}detach(){this.stopListening()}is(e){return"livePosition"===e||"model:livePosition"===e||"position"==e||"model:position"===e}toPosition(){return new As(this.root,this.path.slice(),this.stickiness)}static fromPosition(e,t){return new this(e.root,e.path.slice(),t||e.stickiness)}}function _l(){this.listenTo(this.root.document.model,"applyOperation",(e,t)=>{const o=t[0];o.isDocumentOperation&&vl.call(this,o)},{priority:"low"})}function vl(e){const t=this.getTransformedByOperation(e);if(!this.isEqual(t)){const e=this.toPosition();this.path=t.path,this.root=t.root,this.fire("change",e)}}Co(kl,po);class yl{constructor(e,t,o){this.model=e,this.writer=t,this.position=o,this.canMergeWith=new Set([this.position.parent]),this.schema=e.schema,this._filterAttributesOf=[],this._affectedStart=null,this._affectedEnd=null}handleNodes(e,t){e=Array.from(e);for(let o=0;o{if(!o.doNotResetEntireContent&&function(e,t){const o=e.getLimitElement(t);if(!t.containsEntireContent(o))return!1;const n=t.getFirstRange();if(n.start.parent==n.end.parent)return!1;return e.checkChild(o,"paragraph")}(i,t))return void function(e,t){const o=e.model.schema.getLimitElement(t);e.remove(e.createRangeIn(o)),Al(e,e.createPositionAt(o,0),t)}(e,t);const[r,s]=function(e){const t=e.root.document.model,o=e.start;let n=e.end;if(t.hasContent(e,{ignoreMarkers:!0})){const o=function(e){const t=e.parent,o=t.root.document.model.schema,n=t.getAncestors({parentFirst:!0,includeSelf:!0});for(const e of n){if(o.isLimit(e))return null;if(o.isBlock(e))return e}}(n);if(o&&n.isTouching(t.createPositionAt(o,0))){const o=t.createSelection(e);t.modifySelection(o,{direction:"backward"}),n=o.getLastPosition()}}return[kl.fromPosition(o,"toPrevious"),kl.fromPosition(n,"toNext")]}(n);n.start.isTouching(n.end)||e.remove(n),o.leaveUnmerged||(!function(e,t,o){const n=e.model;if(!Cl(e.model.schema,t,o))return;const[i,r]=function(e,t){const o=e.getAncestors(),n=t.getAncestors();let i=0;for(;o[i]&&o[i]==n[i];)i++;return[o[i],n[i]]}(t,o);!n.hasContent(i,{ignoreMarkers:!0})&&n.hasContent(r,{ignoreMarkers:!0})?function e(t,o,n,i){const r=o.parent,s=n.parent;if(r==i||s==i)return;o=t.createPositionAfter(r),(n=t.createPositionBefore(s)).isEqual(o)||t.insert(r,n);for(;o.parent.isEmpty;){const e=o.parent;o=t.createPositionBefore(e),t.remove(e)}if(n=t.createPositionBefore(s),function(e,t){const o=t.nodeBefore,n=t.nodeAfter;o.name!=n.name&&e.rename(o,n.name);e.clearAttributes(o),e.setAttributes(Object.fromEntries(n.getAttributes()),o),e.merge(t)}(t,n),!Cl(t.model.schema,o,n))return;e(t,o,n,i)}(e,t,o,i.parent):function e(t,o,n,i){const r=o.parent,s=n.parent;if(r==i||s==i)return;o=t.createPositionAfter(r),(n=t.createPositionBefore(s)).isEqual(o)||t.insert(s,o);t.merge(o);for(;n.parent.isEmpty;){const e=n.parent;n=t.createPositionBefore(e),t.remove(e)}if(!Cl(t.model.schema,o,n))return;e(t,o,n,i)}(e,t,o,i.parent)}(e,r,s),i.removeDisallowedAttributes(r.parent.getChildren(),e)),Tl(e,t,r),!o.doNotAutoparagraph&&function(e,t){const o=e.checkChild(t,"$text"),n=e.checkChild(t,"paragraph");return!o&&n}(i,r)&&Al(e,r,t),r.detach(),s.detach()})}function Cl(e,t,o){const n=t.parent,i=o.parent;return n!=i&&(!e.isLimit(n)&&!e.isLimit(i)&&function(e,t,o){const n=new Es(e,t);for(const e of n.getWalker())if(o.isLimit(e.item))return!1;return!0}(t,o,e))}function Al(e,t,o){const n=e.createElement("paragraph");e.insert(n,t),Tl(e,o,e.createPositionAt(n,0))}function Tl(e,t,o){t instanceof Ws?e.setSelection(o):t.setTo(o)}function Pl(e,t){const{isForward:o,walker:n,unit:i,schema:r}=e,{type:s,item:a,nextPosition:l}=t;if("text"==s)return"word"===e.unit?function(e,t){let o=e.position.textNode;if(o){let n=e.position.offset-o.startOffset;for(;!El(o.data,n,t)&&!Rl(o,n,t);){e.next();const i=t?e.position.nodeAfter:e.position.nodeBefore;if(i&&i.is("$text")){const n=i.data.charAt(t?0:i.data.length-1);' ,.?!:;"-()'.includes(n)||(e.next(),o=e.position.textNode)}n=e.position.offset-o.startOffset}}return e.position}(n,o):function(e,t){const o=e.position.textNode;if(o){const n=o.data;let i=e.position.offset-o.startOffset;for(;hl(n,i)||"character"==t&&ul(n,i);)e.next(),i=e.position.offset-o.startOffset}return e.position}(n,i);if(s==(o?"elementStart":"elementEnd")){if(r.isSelectable(a))return As._createAt(a,o?"after":"before");if(r.checkChild(l,"$text"))return l}else{if(r.isLimit(a))return void n.skip(()=>!0);if(r.checkChild(l,"$text"))return l}}function Sl(e,t){const o=e.root,n=As._createAt(o,t?"end":0);return t?new Es(e,n):new Es(n,e)}function El(e,t,o){const n=t+(o?0:-1);return' ,.?!:;"-()'.includes(e.charAt(n))}function Rl(e,t,o){return t===(o?e.endOffset:0)}function Il(e,t){const o=[];Array.from(e.getItems({direction:"backward"})).map(e=>t.createRangeOn(e)).filter(t=>(t.start.isAfter(e.start)||t.start.isEqual(e.start))&&(t.end.isBefore(e.end)||t.end.isEqual(e.end))).forEach(e=>{o.push(e.start.parent),t.remove(e)}),o.forEach(e=>{let o=e;for(;o.parent&&o.isEmpty;){const e=t.createRangeOn(o);o=o.parent,t.remove(e)}})}function Vl(e){e.document.registerPostFixer(t=>function(e,t){const o=t.document.selection,n=t.schema,i=[];let r=!1;for(const e of o.getRanges()){const t=Ol(e,n);t&&!t.isEqual(e)?(i.push(t),r=!0):i.push(e)}r&&e.setSelection(function(e){const t=[];t.push(e.shift());for(const o of e){const e=t.pop();if(o.isIntersecting(e)){const n=e.start.isAfter(o.start)?o.start:e.start,i=e.end.isAfter(o.end)?e.end:o.end,r=new Es(n,i);t.push(r)}else t.push(e),t.push(o)}return t}(i),{backward:o.isBackward})}(t,e))}function Ol(e,t){return e.isCollapsed?function(e,t){const o=e.start,n=t.getNearestSelectionRange(o);if(!n)return null;if(!n.isCollapsed)return n;const i=n.start;if(o.isEqual(i))return null;return new Es(i)}(e,t):function(e,t){const{start:o,end:n}=e,i=t.checkChild(o,"$text"),r=t.checkChild(n,"$text"),s=t.getLimitElement(o),a=t.getLimitElement(n);if(s===a){if(i&&r)return null;if(function(e,t,o){const n=e.nodeAfter&&!o.isLimit(e.nodeAfter)||o.checkChild(e,"$text"),i=t.nodeBefore&&!o.isLimit(t.nodeBefore)||o.checkChild(t,"$text");return n||i}(o,n,t)){const e=o.nodeAfter&&t.isSelectable(o.nodeAfter)?null:t.getNearestSelectionRange(o,"forward"),i=n.nodeBefore&&t.isSelectable(n.nodeBefore)?null:t.getNearestSelectionRange(n,"backward"),r=e?e.start:o,s=i?i.start:n;return new Es(r,s)}}const l=s&&!s.is("rootElement"),c=a&&!a.is("rootElement");if(l||c){const e=o.nodeAfter&&n.nodeBefore&&o.nodeAfter.parent===n.nodeBefore.parent,i=l&&(!e||!Nl(o.nodeAfter,t)),r=c&&(!e||!Nl(n.nodeBefore,t));let d=o,h=n;return i&&(d=As._createBefore(Ml(s,t))),r&&(h=As._createAfter(Ml(a,t))),new Es(d,h)}return null}(e,t)}function Ml(e,t){let o=e,n=o;for(;t.isLimit(n)&&n.parent;)o=n,n=n.parent;return o}function Nl(e,t){return e&&t.isSelectable(e)}class zl{constructor(){this.markers=new fl,this.document=new ml(this),this.schema=new fa,this._pendingChanges=[],this._currentWriter=null,["insertContent","deleteContent","modifySelection","getSelectedContent","applyOperation"].forEach(e=>this.decorate(e)),this.on("applyOperation",(e,t)=>{t[0]._validate()},{priority:"highest"}),this.schema.register("$root",{isLimit:!0}),this.schema.register("$block",{allowIn:"$root",isBlock:!0}),this.schema.register("$text",{allowIn:"$block",isInline:!0,isContent:!0}),this.schema.register("$clipboardHolder",{allowContentOf:"$root",isLimit:!0}),this.schema.extend("$text",{allowIn:"$clipboardHolder"}),this.schema.register("$marker"),this.schema.addChildCheck((e,t)=>{if("$marker"===t.name)return!0}),Vl(this),this.document.registerPostFixer(ta)}change(e){try{return 0===this._pendingChanges.length?(this._pendingChanges.push({batch:new Oa,callback:e}),this._runPendingChanges()[0]):e(this._currentWriter)}catch(e){mo.b.rethrowUnexpectedError(e,this)}}enqueueChange(e,t){try{"string"==typeof e?e=new Oa(e):"function"==typeof e&&(t=e,e=new Oa),this._pendingChanges.push({batch:e,callback:t}),1==this._pendingChanges.length&&this._runPendingChanges()}catch(e){mo.b.rethrowUnexpectedError(e,this)}}applyOperation(e){e._execute()}insertContent(e,t,o){return function(e,t,o,n){return e.change(i=>{let r;r=o?o instanceof Ns||o instanceof Ws?o:i.createSelection(o,n):e.document.selection,r.isCollapsed||e.deleteContent(r,{doNotAutoparagraph:!0});const s=new yl(e,i,r.anchor);let a;a=t.is("documentFragment")?t.getChildren():[t],s.handleNodes(a,{isFirst:!0,isLast:!0});const l=s.getSelectionRange();l&&(r instanceof Ws?i.setSelection(l):r.setTo(l));const c=s.getAffectedRange()||e.createRange(r.anchor);return s.destroy(),c})}(this,e,t,o)}deleteContent(e,t){xl(this,e,t)}modifySelection(e,t){!function(e,t,o={}){const n=e.schema,i="backward"!=o.direction,r=o.unit?o.unit:"character",s=t.focus,a=new xs({boundaries:Sl(s,i),singleCharacters:!0,direction:i?"forward":"backward"}),l={walker:a,schema:n,isForward:i,unit:r};let c;for(;c=a.next();){if(c.done)return;const o=Pl(l,c.value);if(o)return void(t instanceof Ws?e.change(e=>{e.setSelectionFocus(o)}):t.setFocus(o))}}(this,e,t)}getSelectedContent(e){return function(e,t){return e.change(e=>{const o=e.createDocumentFragment(),n=t.getFirstRange();if(!n||n.isCollapsed)return o;const i=n.start.root,r=n.start.getCommonPath(n.end),s=i.getNodeByPath(r);let a;a=n.start.parent==n.end.parent?n:e.createRange(e.createPositionAt(s,n.start.path[r.length]),e.createPositionAt(s,n.end.path[r.length]+1));const l=a.end.offset-a.start.offset;for(const t of a.getItems({shallow:!0}))t.is("$textProxy")?e.appendText(t.data,t.getAttributes(),o):e.append(e.cloneElement(t,!0),o);if(a!=n){const t=n._getTransformedByMove(a.start,e.createPositionAt(o,0),l)[0],i=e.createRange(e.createPositionAt(o,0),t.start);Il(e.createRange(t.end,e.createPositionAt(o,"end")),e),Il(i,e)}return o})}(this,e)}hasContent(e,t={}){const o=e instanceof ys?Es._createIn(e):e;if(o.isCollapsed)return!1;const{ignoreWhitespaces:n=!1,ignoreMarkers:i=!1}=t;if(!i)for(const e of this.markers.getMarkersIntersectingRange(o))if(e.affectsData)return!0;for(const e of o.getItems())if(this.schema.isContent(e)){if(!e.is("$textProxy"))return!0;if(!n)return!0;if(-1!==e.data.search(/\S/))return!0}return!1}createPositionFromPath(e,t,o){return new As(e,t,o)}createPositionAt(e,t){return As._createAt(e,t)}createPositionAfter(e){return As._createAfter(e)}createPositionBefore(e){return As._createBefore(e)}createRange(e,t){return new Es(e,t)}createRangeIn(e){return Es._createIn(e)}createRangeOn(e){return Es._createOn(e)}createSelection(e,t,o){return new Ns(e,t,o)}createBatch(e){return new Oa(e)}createOperationFromJSON(e){return class{static fromJSON(e,t){return wl[e.__className].fromJSON(e,t)}}.fromJSON(e,this.document)}destroy(){this.document.destroy(),this.stopListening()}_runPendingChanges(){const e=[];for(this.fire("_beforeChanges");this._pendingChanges.length;){const t=this._pendingChanges[0].batch;this._currentWriter=new el(this,t);const o=this._pendingChanges[0].callback(this._currentWriter);e.push(o),this.document._handleChangeBlock(this._currentWriter),this._pendingChanges.shift(),this._currentWriter=null}return this.fire("_afterChanges"),e}}Co(zl,qn);class Bl{constructor(){this._listener=Object.create(gr)}listenTo(e){this._listener.listenTo(e,"keydown",(e,t)=>{this._listener.fire("_keydown:"+bi(t),t)})}set(e,t,o={}){const n=wi(e),i=o.priority;this._listener.listenTo(this._listener,"_keydown:"+n,(e,o)=>{t(o,()=>{o.preventDefault(),o.stopPropagation(),e.stop()}),e.return=!0},{priority:i})}press(e){return!!this._listener.fire("_keydown:"+bi(e),e)}destroy(){this._listener.stopListening()}}class Fl extends Bl{constructor(e){super(),this.editor=e}set(e,t,o={}){if("string"==typeof t){const e=t;t=(t,o)=>{this.editor.execute(e),o()}}super.set(e,t,o)}}class Dl{constructor(e={}){this._context=e.context||new Io({language:e.language}),this._context._addEditor(this,!e.context);const t=Array.from(this.constructor.builtinPlugins||[]);this.config=new io(e,this.constructor.defaultConfig),this.config.define("plugins",t),this.config.define(this._context._getEditorConfig()),this.plugins=new To(this,t,this._context.plugins),this.locale=this._context.locale,this.t=this.locale.t,this.commands=new ua,this.set("state","initializing"),this.once("ready",()=>this.state="ready",{priority:"high"}),this.once("destroy",()=>this.state="destroyed",{priority:"high"}),this.set("isReadOnly",!1),this.model=new zl;const o=new Vn;this.data=new Ea(this.model,o),this.editing=new ha(this.model,o),this.editing.view.document.bind("isReadOnly").to(this),this.conversion=new Ra([this.editing.downcastDispatcher,this.data.downcastDispatcher],this.data.upcastDispatcher),this.conversion.addAlias("dataDowncast",this.data.downcastDispatcher),this.conversion.addAlias("editingDowncast",this.editing.downcastDispatcher),this.keystrokes=new Fl(this),this.keystrokes.listenTo(this.editing.view.document)}initPlugins(){const e=this.config,t=e.get("plugins"),o=e.get("removePlugins")||[],n=e.get("extraPlugins")||[];return this.plugins.init(t.concat(n),o)}destroy(){let e=Promise.resolve();return"initializing"==this.state&&(e=new Promise(e=>this.once("ready",e))),e.then(()=>{this.fire("destroy"),this.stopListening(),this.commands.destroy()}).then(()=>this.plugins.destroy()).then(()=>{this.model.destroy(),this.data.destroy(),this.editing.destroy(),this.keystrokes.destroy()}).then(()=>this._context._removeEditor(this))}execute(...e){try{return this.commands.execute(...e)}catch(e){mo.b.rethrowUnexpectedError(e,this)}}}Co(Dl,qn);class Ll{getHtml(e){const t=document.implementation.createHTMLDocument("").createElement("div");return t.appendChild(e),t.innerHTML}}class Hl{constructor(e){this._domParser=new DOMParser,this._domConverter=new cr(e,{blockFillerMode:"nbsp"}),this._htmlWriter=new Ll}toData(e){const t=this._domConverter.viewToDom(e,document);return this._htmlWriter.getHtml(t)}toView(e){const t=this._toDom(e);return this._domConverter.domToView(t)}_toDom(e){const t=this._domParser.parseFromString(e,"text/html"),o=t.createDocumentFragment(),n=t.body.childNodes;for(;n.length>0;)o.appendChild(n[0]);return o}}class jl{constructor(e){this.editor=e,this.set("isEnabled",!0),this._disableStack=new Set}forceDisabled(e){this._disableStack.add(e),1==this._disableStack.size&&(this.on("set:isEnabled",Wl,{priority:"highest"}),this.isEnabled=!1)}clearForceDisabled(e){this._disableStack.delete(e),0==this._disableStack.size&&(this.off("set:isEnabled",Wl),this.isEnabled=!0)}destroy(){this.stopListening()}static get isContextPlugin(){return!1}}function Wl(e){e.return=!1,e.stop()}Co(jl,qn);class ql extends Ao{constructor(e=[]){super(e,{idProperty:"viewUid"}),this.on("add",(e,t,o)=>{this._renderViewIntoCollectionParent(t,o)}),this.on("remove",(e,t)=>{t.element&&this._parentElement&&t.element.remove()}),this._parentElement=null}destroy(){this.map(e=>e.destroy())}setParent(e){this._parentElement=e;for(const e of this)this._renderViewIntoCollectionParent(e)}delegate(...e){if(!e.length||!e.every(e=>"string"==typeof e))throw new mo.b("ui-viewcollection-delegate-wrong-events: All event names must be strings.",this);return{to:t=>{for(const o of this)for(const n of e)o.delegate(n).to(t);this.on("add",(o,n)=>{for(const o of e)n.delegate(o).to(t)}),this.on("remove",(o,n)=>{for(const o of e)n.stopDelegating(o,t)})}}}_renderViewIntoCollectionParent(e,t){e.isRendered||e.render(),e.element&&this._parentElement&&this._parentElement.insertBefore(e.element,this._parentElement.children[t])}}class $l{constructor(e){Object.assign(this,tc(ec(e))),this._isRendered=!1,this._revertData=null}render(){const e=this._renderNode({intoFragment:!0});return this._isRendered=!0,e}apply(e){return this._revertData={children:[],bindings:[],attributes:{}},this._renderNode({node:e,isApplying:!0,revertData:this._revertData}),e}revert(e){if(!this._revertData)throw new mo.b("ui-template-revert-not-applied: Attempting to revert a template which has not been applied yet.",[this,e]);this._revertTemplateFromNode(e,this._revertData)}*getViews(){yield*function*e(t){if(t.children)for(const o of t.children)sc(o)?yield o:ac(o)&&(yield*e(o))}(this)}static bind(e,t){return{to:(o,n)=>new Gl({eventNameOrFunction:o,attribute:o,observable:e,emitter:t,callback:n}),if:(o,n,i)=>new Kl({observable:e,emitter:t,attribute:o,valueIfTrue:n,callback:i})}}static extend(e,t){if(e._isRendered)throw new mo.b("template-extend-render: Attempting to extend a template which has already been rendered.",[this,e]);!function e(t,o){o.attributes&&(t.attributes||(t.attributes={}),ic(t.attributes,o.attributes));o.eventListeners&&(t.eventListeners||(t.eventListeners={}),ic(t.eventListeners,o.eventListeners));o.text&&t.text.push(...o.text);if(o.children&&o.children.length){if(t.children.length!=o.children.length)throw new mo.b("ui-template-extend-children-mismatch: The number of children in extended definition does not match.",t);let n=0;for(const i of o.children)e(t.children[n++],i)}}(e,tc(ec(t)))}_renderNode(e){let t;if(t=e.node?this.tag&&this.text:this.tag?this.text:!this.text,t)throw new mo.b('ui-template-wrong-syntax: Node definition must have either "tag" or "text" when rendering a new Node.',this);return this.text?this._renderText(e):this._renderElement(e)}_renderElement(e){let t=e.node;return t||(t=e.node=document.createElementNS(this.ns||"http://www.w3.org/1999/xhtml",this.tag)),this._renderAttributes(e),this._renderElementChildren(e),this._setUpListeners(e),t}_renderText(e){let t=e.node;return t?e.revertData.text=t.textContent:t=e.node=document.createTextNode(""),Jl(this.text)?this._bindToObservable({schema:this.text,updater:Ql(t),data:e}):t.textContent=this.text.join(""),t}_renderAttributes(e){let t,o,n,i;if(!this.attributes)return;const r=e.node,s=e.revertData;for(t in this.attributes)if(n=r.getAttribute(t),o=this.attributes[t],s&&(s.attributes[t]=n),i=B(o[0])&&o[0].ns?o[0].ns:null,Jl(o)){const a=i?o[0].value:o;s&&cc(t)&&a.unshift(n),this._bindToObservable({schema:a,updater:Xl(r,t,i),data:e})}else"style"==t&&"string"!=typeof o[0]?this._renderStyleAttribute(o[0],e):(s&&n&&cc(t)&&o.unshift(n),o=o.map(e=>e&&e.value||e).reduce((e,t)=>e.concat(t),[]).reduce(nc,""),rc(o)||r.setAttributeNS(i,t,o))}_renderStyleAttribute(e,t){const o=t.node;for(const n in e){const i=e[n];Jl(i)?this._bindToObservable({schema:[i],updater:Zl(o,n),data:t}):o.style[n]=i}}_renderElementChildren(e){const t=e.node,o=e.intoFragment?document.createDocumentFragment():t,n=e.isApplying;let i=0;for(const r of this.children)if(lc(r)){if(!n){r.setParent(t);for(const e of r)o.appendChild(e.element)}}else if(sc(r))n||(r.isRendered||r.render(),o.appendChild(r.element));else if(er(r))o.appendChild(r);else if(n){const t={children:[],bindings:[],attributes:{}};e.revertData.children.push(t),r._renderNode({node:o.childNodes[i++],isApplying:!0,revertData:t})}else o.appendChild(r.render());e.intoFragment&&t.appendChild(o)}_setUpListeners(e){if(this.eventListeners)for(const t in this.eventListeners){const o=this.eventListeners[t].map(o=>{const[n,i]=t.split("@");return o.activateDomEventListener(n,i,e)});e.revertData&&e.revertData.bindings.push(o)}}_bindToObservable({schema:e,updater:t,data:o}){const n=o.revertData;Yl(e,t,o);const i=e.filter(e=>!rc(e)).filter(e=>e.observable).map(n=>n.activateAttributeListener(e,t,o));n&&n.bindings.push(i)}_revertTemplateFromNode(e,t){for(const e of t.bindings)for(const t of e)t();if(t.text)e.textContent=t.text;else{for(const o in t.attributes){const n=t.attributes[o];null===n?e.removeAttribute(o):e.setAttribute(o,n)}for(let o=0;oYl(e,t,o);return this.emitter.listenTo(this.observable,"change:"+this.attribute,n),()=>{this.emitter.stopListening(this.observable,"change:"+this.attribute,n)}}}class Gl extends Ul{activateDomEventListener(e,t,o){const n=(e,o)=>{t&&!o.target.matches(t)||("function"==typeof this.eventNameOrFunction?this.eventNameOrFunction(o):this.observable.fire(this.eventNameOrFunction,o))};return this.emitter.listenTo(o.node,e,n),()=>{this.emitter.stopListening(o.node,e,n)}}}class Kl extends Ul{getValue(e){return!rc(super.getValue(e))&&(this.valueIfTrue||!0)}}function Jl(e){return!!e&&(e.value&&(e=e.value),Array.isArray(e)?e.some(Jl):e instanceof Ul)}function Yl(e,t,{node:o}){let n=function(e,t){return e.map(e=>e instanceof Ul?e.getValue(t):e)}(e,o);n=1==e.length&&e[0]instanceof Kl?n[0]:n.reduce(nc,""),rc(n)?t.remove():t.set(n)}function Ql(e){return{set(t){e.textContent=t},remove(){e.textContent=""}}}function Xl(e,t,o){return{set(n){e.setAttributeNS(o,t,n)},remove(){e.removeAttributeNS(o,t)}}}function Zl(e,t){return{set(o){e.style[t]=o},remove(){e.style[t]=null}}}function ec(e){return oo(e,e=>{if(e&&(e instanceof Ul||ac(e)||sc(e)||lc(e)))return e})}function tc(e){if("string"==typeof e?e=function(e){return{text:[e]}}(e):e.text&&function(e){Array.isArray(e.text)||(e.text=[e.text])}(e),e.on&&(e.eventListeners=function(e){for(const t in e)oc(e,t);return e}(e.on),delete e.on),!e.text){e.attributes&&function(e){for(const t in e)e[t].value&&(e[t].value=[].concat(e[t].value)),oc(e,t)}(e.attributes);const t=[];if(e.children)if(lc(e.children))t.push(e.children);else for(const o of e.children)ac(o)||sc(o)||er(o)?t.push(o):t.push(new $l(o));e.children=t}return e}function oc(e,t){Array.isArray(e[t])||(e[t]=[e[t]])}function nc(e,t){return rc(t)?e:rc(e)?t:`${e} ${t}`}function ic(e,t){for(const o in t)e[o]?e[o].push(...t[o]):e[o]=t[o]}function rc(e){return!e&&0!==e}function sc(e){return e instanceof dc}function ac(e){return e instanceof $l}function lc(e){return e instanceof ql}function cc(e){return"class"==e||"style"==e}o(16);class dc{constructor(e){this.element=null,this.isRendered=!1,this.locale=e,this.t=e&&e.t,this._viewCollections=new Ao,this._unboundChildren=this.createCollection(),this._viewCollections.on("add",(t,o)=>{o.locale=e}),this.decorate("render")}get bindTemplate(){return this._bindTemplate?this._bindTemplate:this._bindTemplate=$l.bind(this,this)}createCollection(e){const t=new ql(e);return this._viewCollections.add(t),t}registerChild(e){xo(e)||(e=[e]);for(const t of e)this._unboundChildren.add(t)}deregisterChild(e){xo(e)||(e=[e]);for(const t of e)this._unboundChildren.remove(t)}setTemplate(e){this.template=new $l(e)}extendTemplate(e){$l.extend(this.template,e)}render(){if(this.isRendered)throw new mo.b("ui-view-render-already-rendered: This View has already been rendered.",this);this.template&&(this.element=this.template.render(),this.registerChild(this.template.getViews())),this.isRendered=!0}destroy(){this.stopListening(),this._viewCollections.map(e=>e.destroy()),this.template&&this.template._revertData&&this.template.revert(this.element)}}function hc({element:e,target:t,positions:o,limiter:n,fitInViewport:i}){D(t)&&(t=t()),D(n)&&(n=n());const r=function(e){return e&&e.parentNode?e.offsetParent===rr.document.body?null:e.offsetParent:null}(e),s=new is(e),a=new is(t);let l,c;if(n||i){const e=function(e,t){const{elementRect:o,viewportRect:n}=t,i=o.getArea(),r=function(e,{targetRect:t,elementRect:o,limiterRect:n,viewportRect:i}){const r=[],s=o.getArea();for(const a of e){const e=uc(a,t,o);if(!e)continue;const[l,c]=e;let d=0,h=0;if(n)if(i){const e=n.getIntersection(i);e&&(d=e.getIntersectionArea(c))}else d=n.getIntersectionArea(c);i&&(h=i.getIntersectionArea(c));const u={positionName:l,positionRect:c,limiterIntersectArea:d,viewportIntersectArea:h};if(d===s)return[u];r.push(u)}return r}(e,t);if(n){const e=mc(r.filter(({viewportIntersectArea:e})=>e===i),i);if(e)return e}return mc(r,i)}(o,{targetRect:a,elementRect:s,limiterRect:n&&new is(n).getVisible(),viewportRect:i&&new is(rr.window)});[c,l]=e||uc(o[0],a,s)}else[c,l]=uc(o[0],a,s);let d=gc(l);return r&&(d=function({left:e,top:t},o){const n=gc(new is(o)),i=os(o);return e-=n.left,t-=n.top,e+=o.scrollLeft,t+=o.scrollTop,e-=i.left,t-=i.top,{left:e,top:t}}(d,r)),{left:d.left,top:d.top,name:c}}function uc(e,t,o){const n=e(t,o);if(!n)return null;const{left:i,top:r,name:s}=n;return[s,o.clone().moveTo(i,r)]}function mc(e,t){let o,n,i=0;for(const{positionName:r,positionRect:s,limiterIntersectArea:a,viewportIntersectArea:l}of e){if(a===t)return[r,s];const e=l**2+a**2;e>i&&(i=e,o=s,n=r)}return o?[n,o]:null}function gc({left:e,top:t}){const{scrollX:o,scrollY:n}=rr.window;return{left:e+o,top:t+n}}function fc(e){return t=>t+e}Co(dc,gr),Co(dc,qn);o(18);const pc=fc("px"),bc=rr.document.body;class wc extends dc{constructor(e){super(e);const t=this.bindTemplate;this.set("top",0),this.set("left",0),this.set("position","arrow_nw"),this.set("isVisible",!1),this.set("withArrow",!0),this.set("class"),this.content=this.createCollection(),this.setTemplate({tag:"div",attributes:{class:["ck","ck-balloon-panel",t.to("position",e=>"ck-balloon-panel_"+e),t.if("isVisible","ck-balloon-panel_visible"),t.if("withArrow","ck-balloon-panel_with-arrow"),t.to("class")],style:{top:t.to("top",pc),left:t.to("left",pc)}},children:this.content})}show(){this.isVisible=!0}hide(){this.isVisible=!1}attachTo(e){this.show();const t=wc.defaultPositions,o=Object.assign({},{element:this.element,positions:[t.southArrowNorth,t.southArrowNorthMiddleWest,t.southArrowNorthMiddleEast,t.southArrowNorthWest,t.southArrowNorthEast,t.northArrowSouth,t.northArrowSouthMiddleWest,t.northArrowSouthMiddleEast,t.northArrowSouthWest,t.northArrowSouthEast],limiter:bc,fitInViewport:!0},e),n=wc._getOptimalPosition(o),i=parseInt(n.left),r=parseInt(n.top),s=n.name;Object.assign(this,{top:r,left:i,position:s})}pin(e){this.unpin(),this._pinWhenIsVisibleCallback=()=>{this.isVisible?this._startPinning(e):this._stopPinning()},this._startPinning(e),this.listenTo(this,"change:isVisible",this._pinWhenIsVisibleCallback)}unpin(){this._pinWhenIsVisibleCallback&&(this._stopPinning(),this.stopListening(this,"change:isVisible",this._pinWhenIsVisibleCallback),this._pinWhenIsVisibleCallback=null,this.hide())}_startPinning(e){this.attachTo(e);const t=kc(e.target),o=e.limiter?kc(e.limiter):bc;this.listenTo(rr.document,"scroll",(n,i)=>{const r=i.target,s=t&&r.contains(t),a=o&&r.contains(o);!s&&!a&&t&&o||this.attachTo(e)},{useCapture:!0}),this.listenTo(rr.window,"resize",()=>{this.attachTo(e)})}_stopPinning(){this.stopListening(rr.document,"scroll"),this.stopListening(rr.window,"resize")}}function kc(e){return no(e)?e:ts(e)?e.commonAncestorContainer:"function"==typeof e?kc(e()):null}function _c(e,t){return e.top-t.height-wc.arrowVerticalOffset}function vc(e){return e.bottom+wc.arrowVerticalOffset}wc.arrowHorizontalOffset=25,wc.arrowVerticalOffset=10,wc._getOptimalPosition=hc,wc.defaultPositions={northWestArrowSouthWest:(e,t)=>({top:_c(e,t),left:e.left-wc.arrowHorizontalOffset,name:"arrow_sw"}),northWestArrowSouthMiddleWest:(e,t)=>({top:_c(e,t),left:e.left-.25*t.width-wc.arrowHorizontalOffset,name:"arrow_smw"}),northWestArrowSouth:(e,t)=>({top:_c(e,t),left:e.left-t.width/2,name:"arrow_s"}),northWestArrowSouthMiddleEast:(e,t)=>({top:_c(e,t),left:e.left-.75*t.width+wc.arrowHorizontalOffset,name:"arrow_sme"}),northWestArrowSouthEast:(e,t)=>({top:_c(e,t),left:e.left-t.width+wc.arrowHorizontalOffset,name:"arrow_se"}),northArrowSouthWest:(e,t)=>({top:_c(e,t),left:e.left+e.width/2-wc.arrowHorizontalOffset,name:"arrow_sw"}),northArrowSouthMiddleWest:(e,t)=>({top:_c(e,t),left:e.left+e.width/2-.25*t.width-wc.arrowHorizontalOffset,name:"arrow_smw"}),northArrowSouth:(e,t)=>({top:_c(e,t),left:e.left+e.width/2-t.width/2,name:"arrow_s"}),northArrowSouthMiddleEast:(e,t)=>({top:_c(e,t),left:e.left+e.width/2-.75*t.width+wc.arrowHorizontalOffset,name:"arrow_sme"}),northArrowSouthEast:(e,t)=>({top:_c(e,t),left:e.left+e.width/2-t.width+wc.arrowHorizontalOffset,name:"arrow_se"}),northEastArrowSouthWest:(e,t)=>({top:_c(e,t),left:e.right-wc.arrowHorizontalOffset,name:"arrow_sw"}),northEastArrowSouthMiddleWest:(e,t)=>({top:_c(e,t),left:e.right-.25*t.width-wc.arrowHorizontalOffset,name:"arrow_smw"}),northEastArrowSouth:(e,t)=>({top:_c(e,t),left:e.right-t.width/2,name:"arrow_s"}),northEastArrowSouthMiddleEast:(e,t)=>({top:_c(e,t),left:e.right-.75*t.width+wc.arrowHorizontalOffset,name:"arrow_sme"}),northEastArrowSouthEast:(e,t)=>({top:_c(e,t),left:e.right-t.width+wc.arrowHorizontalOffset,name:"arrow_se"}),southWestArrowNorthWest:(e,t)=>({top:vc(e),left:e.left-wc.arrowHorizontalOffset,name:"arrow_nw"}),southWestArrowNorthMiddleWest:(e,t)=>({top:vc(e),left:e.left-.25*t.width-wc.arrowHorizontalOffset,name:"arrow_nmw"}),southWestArrowNorth:(e,t)=>({top:vc(e),left:e.left-t.width/2,name:"arrow_n"}),southWestArrowNorthMiddleEast:(e,t)=>({top:vc(e),left:e.left-.75*t.width+wc.arrowHorizontalOffset,name:"arrow_nme"}),southWestArrowNorthEast:(e,t)=>({top:vc(e),left:e.left-t.width+wc.arrowHorizontalOffset,name:"arrow_ne"}),southArrowNorthWest:(e,t)=>({top:vc(e),left:e.left+e.width/2-wc.arrowHorizontalOffset,name:"arrow_nw"}),southArrowNorthMiddleWest:(e,t)=>({top:vc(e),left:e.left+e.width/2-.25*t.width-wc.arrowHorizontalOffset,name:"arrow_nmw"}),southArrowNorth:(e,t)=>({top:vc(e),left:e.left+e.width/2-t.width/2,name:"arrow_n"}),southArrowNorthMiddleEast:(e,t)=>({top:vc(e),left:e.left+e.width/2-.75*t.width+wc.arrowHorizontalOffset,name:"arrow_nme"}),southArrowNorthEast:(e,t)=>({top:vc(e),left:e.left+e.width/2-t.width+wc.arrowHorizontalOffset,name:"arrow_ne"}),southEastArrowNorthWest:(e,t)=>({top:vc(e),left:e.right-wc.arrowHorizontalOffset,name:"arrow_nw"}),southEastArrowNorthMiddleWest:(e,t)=>({top:vc(e),left:e.right-.25*t.width-wc.arrowHorizontalOffset,name:"arrow_nmw"}),southEastArrowNorth:(e,t)=>({top:vc(e),left:e.right-t.width/2,name:"arrow_n"}),southEastArrowNorthMiddleEast:(e,t)=>({top:vc(e),left:e.right-.75*t.width+wc.arrowHorizontalOffset,name:"arrow_nme"}),southEastArrowNorthEast:(e,t)=>({top:vc(e),left:e.right-t.width+wc.arrowHorizontalOffset,name:"arrow_ne"})};o(20);class yc extends dc{constructor(){super();const e=this.bindTemplate;this.set("content",""),this.set("viewBox","0 0 20 20"),this.set("fillColor",""),this.setTemplate({tag:"svg",ns:"http://www.w3.org/2000/svg",attributes:{class:["ck","ck-icon"],viewBox:e.to("viewBox")}})}render(){super.render(),this._updateXMLContent(),this._colorFillPaths(),this.on("change:content",()=>{this._updateXMLContent(),this._colorFillPaths()}),this.on("change:fillColor",()=>{this._colorFillPaths()})}_updateXMLContent(){if(this.content){const e=(new DOMParser).parseFromString(this.content.trim(),"image/svg+xml").querySelector("svg"),t=e.getAttribute("viewBox");for(t&&(this.viewBox=t),this.element.innerHTML="";e.childNodes.length>0;)this.element.appendChild(e.childNodes[0])}}_colorFillPaths(){this.fillColor&&this.element.querySelectorAll(".ck-icon__fill").forEach(e=>{e.style.fill=this.fillColor})}}o(22);class xc extends dc{constructor(e){super(e),this.set("text",""),this.set("position","s");const t=this.bindTemplate;this.setTemplate({tag:"span",attributes:{class:["ck","ck-tooltip",t.to("position",e=>"ck-tooltip_"+e),t.if("text","ck-hidden",e=>!e.trim())]},children:[{tag:"span",attributes:{class:["ck","ck-tooltip__text"]},children:[{text:t.to("text")}]}]})}}o(24);class Cc extends dc{constructor(e){super(e);const t=this.bindTemplate,o=ho();this.set("class"),this.set("labelStyle"),this.set("icon"),this.set("isEnabled",!0),this.set("isOn",!1),this.set("isVisible",!0),this.set("isToggleable",!1),this.set("keystroke"),this.set("label"),this.set("tabindex",-1),this.set("tooltip"),this.set("tooltipPosition","s"),this.set("type","button"),this.set("withText",!1),this.set("withKeystroke",!1),this.children=this.createCollection(),this.tooltipView=this._createTooltipView(),this.labelView=this._createLabelView(o),this.iconView=new yc,this.iconView.extendTemplate({attributes:{class:"ck-button__icon"}}),this.keystrokeView=this._createKeystrokeView(),this.bind("_tooltipString").to(this,"tooltip",this,"label",this,"keystroke",this._getTooltipString.bind(this)),this.setTemplate({tag:"button",attributes:{class:["ck","ck-button",t.to("class"),t.if("isEnabled","ck-disabled",e=>!e),t.if("isVisible","ck-hidden",e=>!e),t.to("isOn",e=>e?"ck-on":"ck-off"),t.if("withText","ck-button_with-text"),t.if("withKeystroke","ck-button_with-keystroke")],type:t.to("type",e=>e||"button"),tabindex:t.to("tabindex"),"aria-labelledby":"ck-editor__aria-label_"+o,"aria-disabled":t.if("isEnabled",!0,e=>!e),"aria-pressed":t.to("isOn",e=>!!this.isToggleable&&String(e))},children:this.children,on:{mousedown:t.to(e=>{e.preventDefault()}),click:t.to(e=>{this.isEnabled?this.fire("execute"):e.preventDefault()})}})}render(){super.render(),this.icon&&(this.iconView.bind("content").to(this,"icon"),this.children.add(this.iconView)),this.children.add(this.tooltipView),this.children.add(this.labelView),this.withKeystroke&&this.children.add(this.keystrokeView)}focus(){this.element.focus()}_createTooltipView(){const e=new xc;return e.bind("text").to(this,"_tooltipString"),e.bind("position").to(this,"tooltipPosition"),e}_createLabelView(e){const t=new dc,o=this.bindTemplate;return t.setTemplate({tag:"span",attributes:{class:["ck","ck-button__label"],style:o.to("labelStyle"),id:"ck-editor__aria-label_"+e},children:[{text:this.bindTemplate.to("label")}]}),t}_createKeystrokeView(){const e=new dc;return e.setTemplate({tag:"span",attributes:{class:["ck","ck-button__keystroke"]},children:[{text:this.bindTemplate.to("keystroke",e=>ki(e))}]}),e}_getTooltipString(e,t,o){return e?"string"==typeof e?e:(o&&(o=ki(o)),e instanceof Function?e(t,o):`${t}${o?` (${o})`:""}`):""}}class Ac{constructor(){this.set("isFocused",!1),this.set("focusedElement",null),this._elements=new Set,this._nextEventLoopTimeout=null}add(e){if(this._elements.has(e))throw new mo.b("focusTracker-add-element-already-exist: This element is already tracked by FocusTracker.",this);this.listenTo(e,"focus",()=>this._focus(e),{useCapture:!0}),this.listenTo(e,"blur",()=>this._blur(),{useCapture:!0}),this._elements.add(e)}remove(e){e===this.focusedElement&&this._blur(e),this._elements.has(e)&&(this.stopListening(e),this._elements.delete(e))}destroy(){this.stopListening()}_focus(e){clearTimeout(this._nextEventLoopTimeout),this.focusedElement=e,this.isFocused=!0}_blur(){clearTimeout(this._nextEventLoopTimeout),this._nextEventLoopTimeout=setTimeout(()=>{this.focusedElement=null,this.isFocused=!1},0)}}Co(Ac,gr),Co(Ac,qn);o(26),o(28);const Tc=fc("px");class Pc extends jl{static get pluginName(){return"ContextualBalloon"}constructor(e){super(e),this.positionLimiter=()=>{const e=this.editor.editing.view,t=e.document.selection.editableElement;return t?e.domConverter.mapViewToDom(t.root):null},this.set("visibleView",null),this.view=new wc(e.locale),e.ui.view.body.add(this.view),e.ui.focusTracker.add(this.view.element),this._viewToStack=new Map,this._idToStack=new Map,this.set("_numberOfStacks",0),this.set("_singleViewMode",!1),this._rotatorView=this._createRotatorView(),this._fakePanelsView=this._createFakePanelsView()}hasView(e){return Array.from(this._viewToStack.keys()).includes(e)}add(e){if(this.hasView(e.view))throw new mo.b("contextualballoon-add-view-exist: Cannot add configuration of the same view twice.",[this,e]);const t=e.stackId||"main";if(!this._idToStack.has(t))return this._idToStack.set(t,new Map([[e.view,e]])),this._viewToStack.set(e.view,this._idToStack.get(t)),this._numberOfStacks=this._idToStack.size,void(this._visibleStack&&!e.singleViewMode||this.showStack(t));const o=this._idToStack.get(t);e.singleViewMode&&this.showStack(t),o.set(e.view,e),this._viewToStack.set(e.view,o),o===this._visibleStack&&this._showView(e)}remove(e){if(!this.hasView(e))throw new mo.b("contextualballoon-remove-view-not-exist: Cannot remove the configuration of a non-existent view.",[this,e]);const t=this._viewToStack.get(e);this._singleViewMode&&this.visibleView===e&&(this._singleViewMode=!1),this.visibleView===e&&(1===t.size?this._idToStack.size>1?this._showNextStack():(this.view.hide(),this.visibleView=null,this._rotatorView.hideView()):this._showView(Array.from(t.values())[t.size-2])),1===t.size?(this._idToStack.delete(this._getStackId(t)),this._numberOfStacks=this._idToStack.size):t.delete(e),this._viewToStack.delete(e)}updatePosition(e){e&&(this._visibleStack.get(this.visibleView).position=e),this.view.pin(this._getBalloonPosition()),this._fakePanelsView.updatePosition()}showStack(e){this.visibleStack=e;const t=this._idToStack.get(e);if(!t)throw new mo.b("contextualballoon-showstack-stack-not-exist: Cannot show a stack that does not exist.",this);this._visibleStack!==t&&this._showView(Array.from(t.values()).pop())}get _visibleStack(){return this._viewToStack.get(this.visibleView)}_getStackId(e){return Array.from(this._idToStack.entries()).find(t=>t[1]===e)[0]}_showNextStack(){const e=Array.from(this._idToStack.values());let t=e.indexOf(this._visibleStack)+1;e[t]||(t=0),this.showStack(this._getStackId(e[t]))}_showPrevStack(){const e=Array.from(this._idToStack.values());let t=e.indexOf(this._visibleStack)-1;e[t]||(t=e.length-1),this.showStack(this._getStackId(e[t]))}_createRotatorView(){const e=new Sc(this.editor.locale),t=this.editor.locale.t;return this.view.content.add(e),e.bind("isNavigationVisible").to(this,"_numberOfStacks",this,"_singleViewMode",(e,t)=>!t&&e>1),e.on("change:isNavigationVisible",()=>this.updatePosition(),{priority:"low"}),e.bind("counter").to(this,"visibleView",this,"_numberOfStacks",(e,o)=>{if(o<2)return"";const n=Array.from(this._idToStack.values()).indexOf(this._visibleStack)+1;return t("%0 of %1",[n,o])}),e.buttonNextView.on("execute",()=>{e.focusTracker.isFocused&&this.editor.editing.view.focus(),this._showNextStack()}),e.buttonPrevView.on("execute",()=>{e.focusTracker.isFocused&&this.editor.editing.view.focus(),this._showPrevStack()}),e}_createFakePanelsView(){const e=new Ec(this.editor.locale,this.view);return e.bind("numberOfPanels").to(this,"_numberOfStacks",this,"_singleViewMode",(e,t)=>!t&&e>=2?Math.min(e-1,2):0),e.listenTo(this.view,"change:top",()=>e.updatePosition()),e.listenTo(this.view,"change:left",()=>e.updatePosition()),this.editor.ui.view.body.add(e),e}_showView({view:e,balloonClassName:t="",withArrow:o=!0,singleViewMode:n=!1}){this.view.class=t,this.view.withArrow=o,this._rotatorView.showView(e),this.visibleView=e,this.view.pin(this._getBalloonPosition()),this._fakePanelsView.updatePosition(),n&&(this._singleViewMode=!0)}_getBalloonPosition(){let e=Array.from(this._visibleStack.values()).pop().position;return e&&!e.limiter&&(e=Object.assign({},e,{limiter:this.positionLimiter})),e}}class Sc extends dc{constructor(e){super(e);const t=e.t,o=this.bindTemplate;this.set("isNavigationVisible",!0),this.focusTracker=new Ac,this.buttonPrevView=this._createButtonView(t("Previous"),' '),this.buttonNextView=this._createButtonView(t("Next"),' '),this.content=this.createCollection(),this.setTemplate({tag:"div",attributes:{class:["ck","ck-balloon-rotator"],"z-index":"-1"},children:[{tag:"div",attributes:{class:["ck-balloon-rotator__navigation",o.to("isNavigationVisible",e=>e?"":"ck-hidden")]},children:[this.buttonPrevView,{tag:"span",attributes:{class:["ck-balloon-rotator__counter"]},children:[{text:o.to("counter")}]},this.buttonNextView]},{tag:"div",attributes:{class:"ck-balloon-rotator__content"},children:this.content}]})}render(){super.render(),this.focusTracker.add(this.element)}showView(e){this.hideView(),this.content.add(e)}hideView(){this.content.clear()}_createButtonView(e,t){const o=new Cc(this.locale);return o.set({label:e,icon:t,tooltip:!0}),o}}class Ec extends dc{constructor(e,t){super(e);const o=this.bindTemplate;this.set("top",0),this.set("left",0),this.set("height",0),this.set("width",0),this.set("numberOfPanels",0),this.content=this.createCollection(),this._balloonPanelView=t,this.setTemplate({tag:"div",attributes:{class:["ck-fake-panel",o.to("numberOfPanels",e=>e?"":"ck-hidden")],style:{top:o.to("top",Tc),left:o.to("left",Tc),width:o.to("width",Tc),height:o.to("height",Tc)}},children:this.content}),this.on("change:numberOfPanels",(e,t,o,n)=>{o>n?this._addPanels(o-n):this._removePanels(n-o),this.updatePosition()})}_addPanels(e){for(;e--;){const e=new dc;e.setTemplate({tag:"div"}),this.content.add(e),this.registerChild(e)}}_removePanels(e){for(;e--;){const e=this.content.last;this.content.remove(e),this.deregisterChild(e),e.destroy()}}updatePosition(){if(this.numberOfPanels){const{top:e,left:t}=this._balloonPanelView,{width:o,height:n}=new is(this._balloonPanelView.element);Object.assign(this,{top:e,left:t,width:o,height:n})}}}class Rc{constructor(e){if(Object.assign(this,e),e.actions&&e.keystrokeHandler)for(const t in e.actions){let o=e.actions[t];"string"==typeof o&&(o=[o]);for(const n of o)e.keystrokeHandler.set(n,(e,o)=>{this[t](),o()})}}get first(){return this.focusables.find(Ic)||null}get last(){return this.focusables.filter(Ic).slice(-1)[0]||null}get next(){return this._getFocusableItem(1)}get previous(){return this._getFocusableItem(-1)}get current(){let e=null;return null===this.focusTracker.focusedElement?null:(this.focusables.find((t,o)=>{const n=t.element===this.focusTracker.focusedElement;return n&&(e=o),n}),e)}focusFirst(){this._focus(this.first)}focusLast(){this._focus(this.last)}focusNext(){this._focus(this.next)}focusPrevious(){this._focus(this.previous)}_focus(e){e&&e.focus()}_getFocusableItem(e){const t=this.current,o=this.focusables.length;if(!o)return null;if(null===t)return this[1===e?"first":"last"];let n=(t+o+e)%o;do{const t=this.focusables.get(n);if(Ic(t))return t;n=(n+o+e)%o}while(n!==t);return null}}function Ic(e){return!(!e.focus||"none"==rr.window.getComputedStyle(e.element).display)}class Vc extends dc{constructor(e){super(e),this.setTemplate({tag:"span",attributes:{class:["ck","ck-toolbar__separator"]}})}}class Oc{constructor(e,t){Oc._observerInstance||Oc._createObserver(),this._element=e,this._callback=t,Oc._addElementCallback(e,t),Oc._observerInstance.observe(e)}destroy(){Oc._deleteElementCallback(this._element,this._callback)}static _addElementCallback(e,t){Oc._elementCallbacks||(Oc._elementCallbacks=new Map);let o=Oc._elementCallbacks.get(e);o||(o=new Set,Oc._elementCallbacks.set(e,o)),o.add(t)}static _deleteElementCallback(e,t){const o=Oc._getElementCallbacks(e);o&&(o.delete(t),o.size||(Oc._elementCallbacks.delete(e),Oc._observerInstance.unobserve(e))),Oc._elementCallbacks&&!Oc._elementCallbacks.size&&(Oc._observerInstance=null,Oc._elementCallbacks=null)}static _getElementCallbacks(e){return Oc._elementCallbacks?Oc._elementCallbacks.get(e):null}static _createObserver(){let e;e="function"==typeof rr.window.ResizeObserver?rr.window.ResizeObserver:Mc,Oc._observerInstance=new e(e=>{for(const t of e){const e=Oc._getElementCallbacks(t.target);if(e)for(const o of e)o(t)}})}}Oc._observerInstance=null,Oc._elementCallbacks=null;class Mc{constructor(e){this._callback=e,this._elements=new Set,this._previousRects=new Map,this._periodicCheckTimeout=null}observe(e){this._elements.add(e),this._checkElementRectsAndExecuteCallback(),1===this._elements.size&&this._startPeriodicCheck()}unobserve(e){this._elements.delete(e),this._previousRects.delete(e),this._elements.size||this._stopPeriodicCheck()}_startPeriodicCheck(){const e=()=>{this._checkElementRectsAndExecuteCallback(),this._periodicCheckTimeout=setTimeout(e,100)};this.listenTo(rr.window,"resize",()=>{this._checkElementRectsAndExecuteCallback()}),this._periodicCheckTimeout=setTimeout(e,100)}_stopPeriodicCheck(){clearTimeout(this._periodicCheckTimeout),this.stopListening(),this._previousRects.clear()}_checkElementRectsAndExecuteCallback(){const e=[];for(const t of this._elements)this._hasRectChanged(t)&&e.push({target:t,contentRect:this._previousRects.get(t)});e.length&&this._callback(e)}_hasRectChanged(e){if(!e.ownerDocument.body.contains(e))return!1;const t=new is(e),o=this._previousRects.get(e),n=!o||!o.isEqual(t);return this._previousRects.set(e,t),n}}Co(Mc,gr);class Nc extends dc{constructor(e){super(e);const t=this.bindTemplate;this.set("isVisible",!1),this.set("position","se"),this.children=this.createCollection(),this.setTemplate({tag:"div",attributes:{class:["ck","ck-reset","ck-dropdown__panel",t.to("position",e=>"ck-dropdown__panel_"+e),t.if("isVisible","ck-dropdown__panel-visible")]},children:this.children,on:{selectstart:t.to(e=>e.preventDefault())}})}focus(){this.children.length&&this.children.first.focus()}focusLast(){if(this.children.length){const e=this.children.last;"function"==typeof e.focusLast?e.focusLast():e.focus()}}}o(30);class zc extends dc{constructor(e,t,o){super(e);const n=this.bindTemplate;this.buttonView=t,this.panelView=o,this.set("isOpen",!1),this.set("isEnabled",!0),this.set("class"),this.set("id"),this.set("panelPosition","auto"),this.keystrokes=new Bl,this.setTemplate({tag:"div",attributes:{class:["ck","ck-dropdown",n.to("class"),n.if("isEnabled","ck-disabled",e=>!e)],id:n.to("id"),"aria-describedby":n.to("ariaDescribedById")},children:[t,o]}),t.extendTemplate({attributes:{class:["ck-dropdown__button"]}})}render(){super.render(),this.listenTo(this.buttonView,"open",()=>{this.isOpen=!this.isOpen}),this.panelView.bind("isVisible").to(this,"isOpen"),this.on("change:isOpen",()=>{this.isOpen&&("auto"===this.panelPosition?this.panelView.position=zc._getOptimalPosition({element:this.panelView.element,target:this.buttonView.element,fitInViewport:!0,positions:this._panelPositions}).name:this.panelView.position=this.panelPosition)}),this.keystrokes.listenTo(this.element);const e=(e,t)=>{this.isOpen&&(this.buttonView.focus(),this.isOpen=!1,t())};this.keystrokes.set("arrowdown",(e,t)=>{this.buttonView.isEnabled&&!this.isOpen&&(this.isOpen=!0,t())}),this.keystrokes.set("arrowright",(e,t)=>{this.isOpen&&t()}),this.keystrokes.set("arrowleft",e),this.keystrokes.set("esc",e)}focus(){this.buttonView.focus()}get _panelPositions(){const{southEast:e,southWest:t,northEast:o,northWest:n}=zc.defaultPanelPositions;return"ltr"===this.locale.uiLanguageDirection?[e,t,o,n]:[t,e,n,o]}}zc.defaultPanelPositions={southEast:e=>({top:e.bottom,left:e.left,name:"se"}),southWest:(e,t)=>({top:e.bottom,left:e.left-t.width+e.width,name:"sw"}),northEast:(e,t)=>({top:e.top-t.height,left:e.left,name:"ne"}),northWest:(e,t)=>({top:e.bottom-t.height,left:e.left-t.width+e.width,name:"nw"})},zc._getOptimalPosition=hc;var Bc=' ';class Fc extends Cc{constructor(e){super(e),this.arrowView=this._createArrowView(),this.extendTemplate({attributes:{"aria-haspopup":!0}}),this.delegate("execute").to(this,"open")}render(){super.render(),this.children.add(this.arrowView)}_createArrowView(){const e=new yc;return e.content=Bc,e.extendTemplate({attributes:{class:"ck-dropdown__arrow"}}),e}}o(32);class Dc extends dc{constructor(){super(),this.items=this.createCollection(),this.focusTracker=new Ac,this.keystrokes=new Bl,this._focusCycler=new Rc({focusables:this.items,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:"arrowup",focusNext:"arrowdown"}}),this.setTemplate({tag:"ul",attributes:{class:["ck","ck-reset","ck-list"]},children:this.items})}render(){super.render();for(const e of this.items)this.focusTracker.add(e.element);this.items.on("add",(e,t)=>{this.focusTracker.add(t.element)}),this.items.on("remove",(e,t)=>{this.focusTracker.remove(t.element)}),this.keystrokes.listenTo(this.element)}focus(){this._focusCycler.focusFirst()}focusLast(){this._focusCycler.focusLast()}}class Lc extends dc{constructor(e){super(e),this.children=this.createCollection(),this.setTemplate({tag:"li",attributes:{class:["ck","ck-list__item"]},children:this.children})}focus(){this.children.first.focus()}}class Hc extends dc{constructor(e){super(e),this.setTemplate({tag:"li",attributes:{class:["ck","ck-list__separator"]}})}}o(34);class jc extends Cc{constructor(e){super(e),this.isToggleable=!0,this.toggleSwitchView=this._createToggleView(),this.extendTemplate({attributes:{class:"ck-switchbutton"}})}render(){super.render(),this.children.add(this.toggleSwitchView)}_createToggleView(){const e=new dc;return e.setTemplate({tag:"span",attributes:{class:["ck","ck-button__toggle"]},children:[{tag:"span",attributes:{class:["ck","ck-button__toggle__inner"]}}]}),e}}function Wc({emitter:e,activator:t,callback:o,contextElements:n}){e.listenTo(document,"mousedown",(e,i)=>{if(!t())return;const r="function"==typeof i.composedPath?i.composedPath():[];for(const e of n)if(e.contains(i.target)||r.includes(e))return;o()})}o(36),o(38);function qc(e,t=Fc){const o=new t(e),n=new Nc(e),i=new zc(e,o,n);return o.bind("isEnabled").to(i),o instanceof Fc?o.bind("isOn").to(i,"isOpen"):o.arrowView.bind("isOn").to(i,"isOpen"),function(e){(function(e){e.on("render",()=>{Wc({emitter:e,activator:()=>e.isOpen,callback:()=>{e.isOpen=!1},contextElements:[e.element]})})})(e),function(e){e.on("execute",t=>{t.source instanceof jc||(e.isOpen=!1)})}(e),function(e){e.keystrokes.set("arrowdown",(t,o)=>{e.isOpen&&(e.panelView.focus(),o())}),e.keystrokes.set("arrowup",(t,o)=>{e.isOpen&&(e.panelView.focusLast(),o())})}(e)}(i),i}function $c(e,t){const o=e.locale,n=e.listView=new Dc(o);n.items.bindTo(t).using(({type:e,model:t})=>{if("separator"===e)return new Hc(o);if("button"===e||"switchbutton"===e){const n=new Lc(o);let i;return i="button"===e?new Cc(o):new jc(o),i.bind(...Object.keys(t)).to(t),i.delegate("execute").to(n),n.children.add(i),n}}),e.panelView.children.add(n),n.items.delegate("execute").to(e)}o(40);class Uc extends dc{constructor(e,t){super(e);const o=this.bindTemplate,n=this.t;var i;this.options=t||{},this.set("ariaLabel",n("Editor toolbar")),this.set("maxWidth","auto"),this.items=this.createCollection(),this.focusTracker=new Ac,this.keystrokes=new Bl,this.set("class"),this.set("isCompact",!1),this.itemsView=new Gc(e),this.children=this.createCollection(),this.children.add(this.itemsView),this.focusables=this.createCollection(),this._focusCycler=new Rc({focusables:this.focusables,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:["arrowleft","arrowup"],focusNext:["arrowright","arrowdown"]}}),this.setTemplate({tag:"div",attributes:{class:["ck","ck-toolbar",o.to("class"),o.if("isCompact","ck-toolbar_compact")],role:"toolbar","aria-label":o.to("ariaLabel"),style:{maxWidth:o.to("maxWidth")}},children:this.children,on:{mousedown:(i=this,i.bindTemplate.to(e=>{e.target===i.element&&e.preventDefault()}))}}),this._behavior=this.options.shouldGroupWhenFull?new Jc(this):new Kc(this)}render(){super.render();for(const e of this.items)this.focusTracker.add(e.element);this.items.on("add",(e,t)=>{this.focusTracker.add(t.element)}),this.items.on("remove",(e,t)=>{this.focusTracker.remove(t.element)}),this.keystrokes.listenTo(this.element),this._behavior.render(this)}destroy(){return this._behavior.destroy(),super.destroy()}focus(){this._focusCycler.focusFirst()}focusLast(){this._focusCycler.focusLast()}fillFromConfig(e,t){this.items.addMany(e.map(e=>"|"==e?new Vc:t.has(e)?t.create(e):void console.warn(Object(mo.a)("toolbarview-item-unavailable: The requested toolbar item is unavailable."),{name:e})).filter(e=>void 0!==e))}}class Gc extends dc{constructor(e){super(e),this.children=this.createCollection(),this.setTemplate({tag:"div",attributes:{class:["ck","ck-toolbar__items"]},children:this.children})}}class Kc{constructor(e){const t=e.bindTemplate;e.set("isVertical",!1),e.itemsView.children.bindTo(e.items).using(e=>e),e.focusables.bindTo(e.items).using(e=>e),e.extendTemplate({attributes:{class:[t.if("isVertical","ck-toolbar_vertical")]}})}render(){}destroy(){}}class Jc{constructor(e){this.view=e,this.viewChildren=e.children,this.viewFocusables=e.focusables,this.viewItemsView=e.itemsView,this.viewFocusTracker=e.focusTracker,this.viewLocale=e.locale,this.ungroupedItems=e.createCollection(),this.groupedItems=e.createCollection(),this.groupedItemsDropdown=this._createGroupedItemsDropdown(),this.resizeObserver=null,this.cachedPadding=null,this.shouldUpdateGroupingOnNextResize=!1,e.itemsView.children.bindTo(this.ungroupedItems).using(e=>e),this.ungroupedItems.on("add",this._updateFocusCycleableItems.bind(this)),this.ungroupedItems.on("remove",this._updateFocusCycleableItems.bind(this)),e.children.on("add",this._updateFocusCycleableItems.bind(this)),e.children.on("remove",this._updateFocusCycleableItems.bind(this)),e.items.on("change",(e,t)=>{const o=t.index;for(const e of t.removed)o>=this.ungroupedItems.length?this.groupedItems.remove(e):this.ungroupedItems.remove(e);for(let e=o;ethis.ungroupedItems.length?this.groupedItems.add(n,e-this.ungroupedItems.length):this.ungroupedItems.add(n,e)}this._updateGrouping()}),e.extendTemplate({attributes:{class:["ck-toolbar_grouping"]}})}render(e){this.viewElement=e.element,this._enableGroupingOnResize(),this._enableGroupingOnMaxWidthChange(e)}destroy(){this.groupedItemsDropdown.destroy(),this.resizeObserver.destroy()}_updateGrouping(){if(!this.viewElement.ownerDocument.body.contains(this.viewElement))return;if(!this.viewElement.offsetParent)return void(this.shouldUpdateGroupingOnNextResize=!0);const e=this.groupedItems.length;let t;for(;this._areItemsOverflowing;)this._groupLastItem(),t=!0;if(!t&&this.groupedItems.length){for(;this.groupedItems.length&&!this._areItemsOverflowing;)this._ungroupFirstItem();this._areItemsOverflowing&&this._groupLastItem()}this.groupedItems.length!==e&&this.view.fire("groupedItemsUpdate")}get _areItemsOverflowing(){if(!this.ungroupedItems.length)return!1;const e=this.viewElement,t=this.viewLocale.uiLanguageDirection,o=new is(e.lastChild),n=new is(e);if(!this.cachedPadding){const o=rr.window.getComputedStyle(e),n="ltr"===t?"paddingRight":"paddingLeft";this.cachedPadding=Number.parseInt(o[n])}return"ltr"===t?o.right>n.right-this.cachedPadding:o.left{e&&e===t.contentRect.width&&!this.shouldUpdateGroupingOnNextResize||(this.shouldUpdateGroupingOnNextResize=!1,this._updateGrouping(),e=t.contentRect.width)}),this._updateGrouping()}_enableGroupingOnMaxWidthChange(e){e.on("change:maxWidth",()=>{this._updateGrouping()})}_groupLastItem(){this.groupedItems.length||(this.viewChildren.add(new Vc),this.viewChildren.add(this.groupedItemsDropdown),this.viewFocusTracker.add(this.groupedItemsDropdown.element)),this.groupedItems.add(this.ungroupedItems.remove(this.ungroupedItems.last),0)}_ungroupFirstItem(){this.ungroupedItems.add(this.groupedItems.remove(this.groupedItems.first)),this.groupedItems.length||(this.viewChildren.remove(this.groupedItemsDropdown),this.viewChildren.remove(this.viewChildren.last),this.viewFocusTracker.remove(this.groupedItemsDropdown.element))}_createGroupedItemsDropdown(){const e=this.viewLocale,t=e.t,o=qc(e);return o.class="ck-toolbar__grouped-dropdown",o.panelPosition="ltr"===e.uiLanguageDirection?"sw":"se",function(e,t){const o=e.locale,n=o.t,i=e.toolbarView=new Uc(o);i.set("ariaLabel",n("Dropdown toolbar")),e.extendTemplate({attributes:{class:["ck-toolbar-dropdown"]}}),t.map(e=>i.items.add(e)),e.panelView.children.add(i),i.items.delegate("execute").to(e)}(o,[]),o.buttonView.set({label:t("Show more items"),tooltip:!0,icon:' '}),o.toolbarView.items.bindTo(this.groupedItems).using(e=>e),o}_updateFocusCycleableItems(){this.viewFocusables.clear(),this.ungroupedItems.map(e=>{this.viewFocusables.add(e)}),this.groupedItems.length&&this.viewFocusables.add(this.groupedItemsDropdown)}}function Yc(e){return Array.isArray(e)?{items:e}:e?Object.assign({items:[]},e):{items:[]}}const Qc=fc("px");class Xc extends jl{static get pluginName(){return"BalloonToolbar"}static get requires(){return[Pc]}constructor(e){super(e),this._balloonConfig=Yc(e.config.get("balloonToolbar")),this.toolbarView=this._createToolbarView(),this.focusTracker=new Ac,e.ui.once("ready",()=>{this.focusTracker.add(e.ui.getEditableElement()),this.focusTracker.add(this.toolbarView.element)}),this._resizeObserver=null,this._balloon=e.plugins.get(Pc),this._fireSelectionChangeDebounced=Jr(()=>this.fire("_selectionChangeDebounced"),200),this.decorate("show")}init(){const e=this.editor,t=e.model.document.selection;this.listenTo(this.focusTracker,"change:isFocused",(e,t,o)=>{const n=this._balloon.visibleView===this.toolbarView;!o&&n?this.hide():o&&this.show()}),this.listenTo(t,"change:range",(e,o)=>{(o.directChange||t.isCollapsed)&&this.hide(),this._fireSelectionChangeDebounced()}),this.listenTo(this,"_selectionChangeDebounced",()=>{this.editor.editing.view.document.isFocused&&this.show()}),this._balloonConfig.shouldNotGroupWhenFull||this.listenTo(e,"ready",()=>{const t=e.ui.view.editable.element;this._resizeObserver=new Oc(t,()=>{this.toolbarView.maxWidth=Qc(.9*new is(t).width)})}),this.listenTo(this.toolbarView,"groupedItemsUpdate",()=>{this._updatePosition()})}afterInit(){const e=this.editor.ui.componentFactory;this.toolbarView.fillFromConfig(this._balloonConfig.items,e)}_createToolbarView(){const e=!this._balloonConfig.shouldNotGroupWhenFull,t=new Uc(this.editor.locale,{shouldGroupWhenFull:e});return t.extendTemplate({attributes:{class:["ck-toolbar_floating"]}}),t.render(),t}show(){const e=this.editor,t=e.model.document.selection,o=e.model.schema;this._balloon.hasView(this.toolbarView)||t.isCollapsed||function(e,t){if(1===e.rangeCount)return!1;return[...e.getRanges()].every(e=>{const o=e.getContainedElement();return o&&t.isSelectable(o)})}(t,o)||Array.from(this.toolbarView.items).every(e=>void 0!==e.isEnabled&&!e.isEnabled)||(this.listenTo(this.editor.ui,"update",()=>{this._updatePosition()}),this._balloon.add({view:this.toolbarView,position:this._getBalloonPositionData(),balloonClassName:"ck-toolbar-container"}))}hide(){this._balloon.hasView(this.toolbarView)&&(this.stopListening(this.editor.ui,"update"),this._balloon.remove(this.toolbarView))}_getBalloonPositionData(){const e=this.editor.editing.view,t=e.document,o=t.selection,n=t.selection.isBackward;return{target:()=>{const t=n?o.getFirstRange():o.getLastRange(),i=is.getDomRangeRects(e.domConverter.viewRangeToDom(t));return n?i[0]:(i.length>1&&0===i[i.length-1].width&&i.pop(),i[i.length-1])},positions:Zc(n)}}_updatePosition(){this._balloon.updatePosition(this._getBalloonPositionData())}destroy(){super.destroy(),this.stopListening(),this._fireSelectionChangeDebounced.cancel(),this.toolbarView.destroy(),this.focusTracker.destroy(),this._resizeObserver&&this._resizeObserver.destroy()}}function Zc(e){const t=wc.defaultPositions;return e?[t.northWestArrowSouth,t.northWestArrowSouthWest,t.northWestArrowSouthEast,t.northWestArrowSouthMiddleEast,t.northWestArrowSouthMiddleWest,t.southWestArrowNorth,t.southWestArrowNorthWest,t.southWestArrowNorthEast,t.southWestArrowNorthMiddleWest,t.southWestArrowNorthMiddleEast]:[t.southEastArrowNorth,t.southEastArrowNorthEast,t.southEastArrowNorthWest,t.southEastArrowNorthMiddleEast,t.southEastArrowNorthMiddleWest,t.northEastArrowSouth,t.northEastArrowSouthEast,t.northEastArrowSouthWest,t.northEastArrowSouthMiddleEast,t.northEastArrowSouthMiddleWest]}class ed{constructor(e){this.editor=e,this._components=new Map}*names(){for(const e of this._components.values())yield e.originalName}add(e,t){this._components.set(td(e),{callback:t,originalName:e})}create(e){if(!this.has(e))throw new mo.b("componentfactory-item-missing: The required component is not registered in the factory.",this,{name:e});return this._components.get(td(e)).callback(this.editor.locale)}has(e){return this._components.has(td(e))}}function td(e){return String(e).toLowerCase()}class od{constructor(e){this.editor=e,this.componentFactory=new ed(e),this.focusTracker=new Ac,this._editableElementsMap=new Map,this.listenTo(e.editing.view.document,"layoutChanged",()=>this.update())}get element(){return null}update(){this.fire("update")}destroy(){this.stopListening(),this.focusTracker.destroy();for(const e of this._editableElementsMap.values())e.ckeditorInstance=null;this._editableElementsMap=new Map}setEditableElement(e,t){this._editableElementsMap.set(e,t),t.ckeditorInstance||(t.ckeditorInstance=this.editor)}getEditableElement(e="main"){return this._editableElementsMap.get(e)}getEditableElementsNames(){return this._editableElementsMap.keys()}get _editableElements(){return console.warn("editor-ui-deprecated-editable-elements: The EditorUI#_editableElements property has been deprecated and will be removed in the near future.",{editorUI:this}),this._editableElementsMap}}Co(od,po);o(42);const nd=new WeakMap;function id(e){const{view:t,element:o,text:n,isDirectHost:i=!0}=e,r=t.document;nd.has(r)||(nd.set(r,new Map),r.registerPostFixer(e=>sd(r,e))),nd.get(r).set(o,{text:n,isDirectHost:i}),t.change(e=>sd(r,e))}function rd(e,t){return!!t.hasClass("ck-placeholder")&&(e.removeClass("ck-placeholder",t),!0)}function sd(e,t){const o=nd.get(e);let n=!1;for(const[e,i]of o)ad(t,e,i)&&(n=!0);return n}function ad(e,t,o){const{text:n,isDirectHost:i}=o,r=i?t:function(e){if(1===e.childCount){const t=e.getChild(0);if(t.is("element")&&!t.is("uiElement"))return t}return null}(t);let s=!1;return!!r&&(o.hostElement=r,r.getAttribute("data-placeholder")!==n&&(e.setAttribute("data-placeholder",n,r),s=!0),!function(e){if(!e.isAttached())return!1;const t=!Array.from(e.getChildren()).some(e=>!e.is("uiElement")),o=e.document;if(!o.isFocused&&t)return!0;const n=o.selection.anchor;return!(!t||!n||n.parent===e)}(r)?rd(e,r)&&(s=!0):function(e,t){return!t.hasClass("ck-placeholder")&&(e.addClass("ck-placeholder",t),!0)}(e,r)&&(s=!0),s)}class ld extends od{constructor(e,t){super(e),this.view=t}get element(){return this.view.editable.element}init(){const e=this.editor,t=this.view,o=e.plugins.get("BalloonToolbar"),n=e.editing.view,i=t.editable,r=n.document.getRoot();i.name=r.rootName,t.render();const s=i.element;this.setEditableElement(i.name,s),this.focusTracker.add(s),i.bind("isFocused").to(this.focusTracker),n.attachDomRoot(s),function({origin:e,originKeystrokeHandler:t,originFocusTracker:o,toolbar:n,beforeFocus:i,afterBlur:r}){o.add(n.element),t.set("Alt+F10",(e,t)=>{o.isFocused&&!n.focusTracker.isFocused&&(i&&i(),n.focus(),t())}),n.keystrokes.set("Esc",(t,o)=>{n.focusTracker.isFocused&&(e.focus(),r&&r(),o())})}({origin:n,originFocusTracker:this.focusTracker,originKeystrokeHandler:e.keystrokes,toolbar:o.toolbarView,beforeFocus(){o.show()},afterBlur(){o.hide()}}),this._initPlaceholder(),this.fire("ready")}destroy(){const e=this.view;this.editor.editing.view.detachDomRoot(e.editable.name),e.destroy(),super.destroy()}_initPlaceholder(){const e=this.editor,t=e.editing.view,o=t.document.getRoot(),n=e.sourceElement,i=e.config.get("placeholder")||n&&"textarea"===n.tagName.toLowerCase()&&n.getAttribute("placeholder");i&&id({view:t,element:o,text:i,isDirectHost:!1})}}var cd=function(e){return"string"==typeof e||!ze(e)&&p(e)&&"[object String]"==m(e)};function dd(e,t,o={},n=[]){const i=o&&o.xmlns,r=i?e.createElementNS(i,t):e.createElement(t);for(const e in o)r.setAttribute(e,o[e]);!cd(n)&&xo(n)||(n=[n]);for(let t of n)cd(t)&&(t=e.createTextNode(t)),r.appendChild(t);return r}class hd extends ql{constructor(e,t=[]){super(t),this.locale=e}attachToDom(){this._bodyCollectionContainer=new $l({tag:"div",attributes:{class:["ck","ck-reset_all","ck-body","ck-rounded-corners"],dir:this.locale.uiLanguageDirection},children:this}).render();let e=document.querySelector(".ck-body-wrapper");e||(e=dd(document,"div",{class:"ck-body-wrapper"}),document.body.appendChild(e)),e.appendChild(this._bodyCollectionContainer)}detachFromDom(){super.destroy(),this._bodyCollectionContainer&&this._bodyCollectionContainer.remove();const e=document.querySelector(".ck-body-wrapper");e&&0==e.childElementCount&&e.remove()}}o(44);class ud extends dc{constructor(e){super(e),this.body=new hd(e)}render(){super.render(),this.body.attachToDom()}destroy(){return this.body.detachFromDom(),super.destroy()}}class md extends dc{constructor(e,t,o){super(e),this.setTemplate({tag:"div",attributes:{class:["ck","ck-content","ck-editor__editable","ck-rounded-corners"],lang:e.contentLanguage,dir:e.contentLanguageDirection}}),this.name=null,this.set("isFocused",!1),this._editableElement=o,this._hasExternalElement=!!this._editableElement,this._editingView=t}render(){super.render(),this._hasExternalElement?this.template.apply(this.element=this._editableElement):this._editableElement=this.element,this.on("change:isFocused",()=>this._updateIsFocusedClasses()),this._updateIsFocusedClasses()}destroy(){this._hasExternalElement&&this.template.revert(this._editableElement),super.destroy()}_updateIsFocusedClasses(){const e=this._editingView;function t(t){e.change(o=>{const n=e.document.getRoot(t.name);o.addClass(t.isFocused?"ck-focused":"ck-blurred",n),o.removeClass(t.isFocused?"ck-blurred":"ck-focused",n)})}e.isRenderingInProgress?function o(n){e.once("change:isRenderingInProgress",(e,i,r)=>{r?o(n):t(n)})}(this):t(this)}}class gd extends md{constructor(e,t,o){super(e,t,o),this.extendTemplate({attributes:{role:"textbox",class:"ck-editor__editable_inline"}})}render(){super.render();const e=this._editingView,t=this.t;e.change(o=>{const n=e.document.getRoot(this.name);o.setAttribute("aria-label",t("Rich Text Editor, %0",[this.name]),n)})}}class fd extends ud{constructor(e,t,o){super(e),this.editable=new gd(e,t,o)}render(){super.render(),this.registerChild(this.editable)}}function pd(e,t){e instanceof HTMLTextAreaElement&&(e.value=t),e.innerHTML=t}var bd={setData(e){this.data.set(e)},getData(e){return this.data.get(e)}};var wd={updateSourceElement(){if(!this.sourceElement)throw new mo.b("editor-missing-sourceelement: Cannot update the source element of a detached editor.",this);pd(this.sourceElement,this.data.get())}};class kd extends Dl{constructor(e,t){super(t),no(e)&&(this.sourceElement=e,function(e){const t=e.sourceElement;if(t){if(t.ckeditorInstance)throw new mo.b("editor-source-element-already-used: The DOM element cannot be used to create multiple editor instances.",e);t.ckeditorInstance=e,e.once("destroy",()=>{delete t.ckeditorInstance})}}(this));const o=this.config.get("plugins");o.push(Xc),this.config.set("plugins",o),this.config.define("balloonToolbar",this.config.get("toolbar")),this.data.processor=new Hl(this.data.viewDocument),this.model.document.createRoot();const n=new fd(this.locale,this.editing.view,this.sourceElement);this.ui=new ld(this,n),function(e){if(!D(e.updateSourceElement))throw new mo.b("attachtoform-missing-elementapi-interface: Editor passed to attachToForm() must implement ElementApi.",e);const t=e.sourceElement;if(t&&"textarea"===t.tagName.toLowerCase()&&t.form){let o;const n=t.form,i=()=>e.updateSourceElement();D(n.submit)&&(o=n.submit,n.submit=()=>{i(),o.apply(n)}),n.addEventListener("submit",i),e.on("destroy",()=>{n.removeEventListener("submit",i),o&&(n.submit=o)})}}(this)}destroy(){const e=this.getData();return this.ui.destroy(),super.destroy().then(()=>{this.sourceElement&&pd(this.sourceElement,e)})}static create(e,t={}){return new Promise(o=>{const n=no(e);if(n&&"TEXTAREA"===e.tagName)throw new mo.b("editor-wrong-element: This type of editor cannot be initialized inside
").replace(/^\s/," ").replace(/\s$/," ").replace(/\s\s/g," ")).indexOf("
")>-1&&(r=`
${r}
`),i=r),i=this._htmlDataProcessor.toView(i);const s=new lo(this,"inputTransformation");this.fire(s,{content:i,dataTransfer:n}),s.stop.called&&e.stop(),o.scrollToTheSelection()},{priority:"low"}),this.listenTo(this,"inputTransformation",(e,o)=>{if(!o.content.isEmpty){const n=this.editor.data,i=this.editor.model,r=n.toModel(o.content,"$clipboardHolder");if(0==r.childCount)return;if(function(e){if(e.childCount>1)return!1;return 0==[...e.getChild(0).getAttributeKeys()].length}(r)){const e=r.getChild(0);i.change(o=>{o.setAttributes(t.selection.getAttributes(),e)})}i.insertContent(r),e.stop()}},{priority:"low"}),this.listenTo(n,"copy",i,{priority:"low"}),this.listenTo(n,"cut",(t,o)=>{e.isReadOnly?o.preventDefault():i(t,o)},{priority:"low"}),this.listenTo(n,"clipboardOutput",(o,n)=>{n.content.isEmpty||(n.dataTransfer.setData("text/html",this._htmlDataProcessor.toData(n.content)),n.dataTransfer.setData("text/plain",function e(t){let o="";if(t.is("$text")||t.is("$textProxy"))o=t.data;else if(t.is("element","img")&&t.hasAttribute("alt"))o=t.getAttribute("alt");else{let n=null;for(const i of t.getChildren()){const t=e(i);n&&(n.is("containerElement")||i.is("containerElement"))&&(tm.includes(n.name)||tm.includes(i.name)?o+="\n":o+="\n\n"),o+=t,n=i}}return o}(n.content))),"cut"==n.method&&e.model.deleteContent(t.selection)},{priority:"low"})}}class nm{constructor(e){this.document=e}createDocumentFragment(e){return new Ei(this.document,e)}createElement(e,t,o){return new Nn(this.document,e,t,o)}createText(e){return new No(this.document,e)}clone(e,t=!1){return e._clone(t)}appendChild(e,t){return t._appendChild(e)}insertChild(e,t,o){return o._insertChild(e,t)}removeChildren(e,t,o){return o._removeChildren(e,t)}remove(e){const t=e.parent;return t?this.removeChildren(t.getChildIndex(e),1,t):[]}replace(e,t){const o=e.parent;if(o){const n=o.getChildIndex(e);return this.removeChildren(n,1,o),this.insertChild(n,t,o),!0}return!1}unwrapElement(e){const t=e.parent;if(t){const o=t.getChildIndex(e);this.remove(e),this.insertChild(o,e.getChildren(),t)}}rename(e,t){const o=new Nn(this.document,e,t.getAttributes(),t.getChildren());return this.replace(t,o)?o:null}setAttribute(e,t,o){o._setAttribute(e,t)}removeAttribute(e,t){t._removeAttribute(e)}addClass(e,t){t._addClass(e)}removeClass(e,t){t._removeClass(e)}setStyle(e,t,o){y(e)&&void 0===o&&(o=t),o._setStyle(e,t)}removeStyle(e,t){t._removeStyle(e)}setCustomProperty(e,t,o){o._setCustomProperty(e,t)}removeCustomProperty(e,t){return t._removeCustomProperty(e)}createPositionAt(e,t){return ei._createAt(e,t)}createPositionAfter(e){return ei._createAfter(e)}createPositionBefore(e){return ei._createBefore(e)}createRange(e,t){return new ti(e,t)}createRangeOn(e){return ti._createOn(e)}createRangeIn(e){return ti._createIn(e)}createSelection(e,t,o){return new ii(e,t,o)}}class im extends Vd{refresh(){const e=this.editor.model.document.selection.getSelectedElement(),t=e&&"image"===e.name||!1;this.isEnabled=Fh(this.editor.model)||t}execute(e){const t=this.editor,o=t.model,n=t.plugins.get(xd);o.change(t=>{const i=Array.isArray(e.file)?e.file:[e.file];for(const e of i)rm(t,o,n,e)})}}function rm(e,t,o,n){const i=o.createLoader(n);i&&Bh(e,t,{uploadId:i.id})}class sm extends jl{static get requires(){return[xd,Xu,om]}static get pluginName(){return"ImageUploadEditing"}constructor(e){super(e),e.config.define("image",{upload:{types:["jpeg","png","gif","bmp","webp","tiff"]}})}init(){const e=this.editor,t=e.model.document,o=e.model.schema,n=e.conversion,i=e.plugins.get(xd),r=Wu(e.config.get("image.upload.types"));o.extend("image",{allowAttributes:["uploadId","uploadStatus"]}),e.commands.add("imageUpload",new im(e)),n.for("upcast").attributeToAttribute({view:{name:"img",key:"uploadId"},model:"uploadId"}),this.listenTo(e.editing.view.document,"clipboardInput",(t,o)=>{if(n=o.dataTransfer,Array.from(n.types).includes("text/html")&&""!==n.getData("text/html"))return;var n;const i=Array.from(o.dataTransfer.files).filter(e=>!!e&&r.test(e.type)),s=o.targetRanges.map(t=>e.editing.mapper.toModelRange(t));e.model.change(o=>{o.setSelection(s),i.length&&(t.stop(),e.model.enqueueChange("default",()=>{e.execute("imageUpload",{file:i})}))})}),this.listenTo(e.plugins.get(om),"inputTransformation",(t,o)=>{const n=Array.from(e.editing.view.createRangeIn(o.content)).filter(e=>{return!(!(t=e.item).is("element","img")||!t.getAttribute("src"))&&(t.getAttribute("src").match(/^data:image\/\w+;base64,/g)||t.getAttribute("src").match(/^blob:/g))&&!e.item.getAttribute("uploadProcessed");var t}).map(e=>{return{promise:(t=e.item,new Promise((e,o)=>{const n=t.getAttribute("src");fetch(n).then(e=>e.blob()).then(t=>{const o=function(e,t){return e.type?e.type:t.match(/data:(image\/\w+);base64/)?t.match(/data:(image\/\w+);base64/)[1].toLowerCase():"image/jpeg"}(t,n),i=o.replace("image/",""),r=new File([t],"image."+i,{type:o});e(r)}).catch(o)})),imageElement:e.item};var t});if(!n.length)return;const r=new nm(e.editing.view.document);for(const e of n){r.setAttribute("uploadProcessed",!0,e.imageElement);const t=i.createLoader(e.promise);t&&(r.setAttribute("src","",e.imageElement),r.setAttribute("uploadId",t.id,e.imageElement))}}),e.editing.view.document.on("dragover",(e,t)=>{t.preventDefault()}),t.on("change",()=>{const o=t.differ.getChanges({includeChangesInGraveyard:!0});for(const t of o)if("insert"==t.type&&"$text"!=t.name){const o=t.position.nodeAfter,n="$graveyard"==t.position.root.rootName;for(const t of am(e,o)){const e=t.getAttribute("uploadId");if(!e)continue;const o=i.loaders.get(e);o&&(n?o.abort():"idle"==o.status&&this._readAndUpload(o,t))}}})}_readAndUpload(e,t){const o=this.editor,n=o.model,i=o.locale.t,r=o.plugins.get(xd),s=o.plugins.get(Xu);return n.enqueueChange("transparent",e=>{e.setAttribute("uploadStatus","reading",t)}),e.read().then(()=>{const i=e.upload();if(mi.isSafari){const e=Dh(o.editing.mapper.toViewElement(t));o.editing.view.once("render",()=>{if(!e.parent)return;const t=o.editing.view.domConverter.mapViewToDom(e.parent);if(!t)return;const n=t.style.display;t.style.display="none",t._ckHack=t.offsetHeight,t.style.display=n})}return n.enqueueChange("transparent",e=>{e.setAttribute("uploadStatus","uploading",t)}),i}).then(e=>{n.enqueueChange("transparent",o=>{o.setAttributes({uploadStatus:"complete",src:e.default},t),this._parseAndSetSrcsetAttributeOnImage(e,t,o)}),a()}).catch(o=>{if("error"!==e.status&&"aborted"!==e.status)throw o;"error"==e.status&&o&&s.showWarning(o,{title:i("Upload failed"),namespace:"upload"}),a(),n.enqueueChange("transparent",e=>{e.remove(t)})});function a(){n.enqueueChange("transparent",e=>{e.removeAttribute("uploadId",t),e.removeAttribute("uploadStatus",t)}),r.destroyLoader(e)}}_parseAndSetSrcsetAttributeOnImage(e,t,o){let n=0;const i=Object.keys(e).filter(e=>{const t=parseInt(e,10);if(!isNaN(t))return n=Math.max(n,t),!0}).map(t=>`${e[t]} ${t}w`).join(", ");""!=i&&o.setAttribute("srcset",{data:i,width:n},t)}}function am(e,t){return Array.from(e.model.createRangeOn(t)).filter(e=>e.item.is("element","image")).map(e=>e.item)}class lm extends Vd{refresh(){const e=this.editor.model.document.selection.getSelectedElement();this.isEnabled=zh(e),e&&e.hasAttribute("width")?this.value={width:e.getAttribute("width"),height:null}:this.value=null}execute(e){const t=this.editor.model,o=t.document.selection.getSelectedElement();this.value={width:e.width,height:null},o&&t.change(t=>{t.setAttribute("width",e.width,o)})}}class cm extends jl{static get pluginName(){return"ImageResizeEditing"}constructor(e){super(e),e.config.define("image",{resizeUnit:"%",resizeOptions:[{name:"imageResize:original",value:null,icon:"original"},{name:"imageResize:25",value:"25",icon:"small"},{name:"imageResize:50",value:"50",icon:"medium"},{name:"imageResize:75",value:"75",icon:"large"}]})}init(){const e=this.editor,t=new lm(e);this._registerSchema(),this._registerConverters(),e.commands.add("imageResize",t)}_registerSchema(){this.editor.model.schema.extend("image",{allowAttributes:"width"}),this.editor.model.schema.setAttributeProperties("width",{isFormatting:!0})}_registerConverters(){const e=this.editor;e.conversion.for("downcast").add(e=>e.on("attribute:width:image",(e,t,o)=>{if(!o.consumable.consume(t.item,e.name))return;const n=o.writer,i=o.mapper.toViewElement(t.item);null!==t.attributeNewValue?(n.setStyle("width",t.attributeNewValue,i),n.addClass("image_resized",i)):(n.removeStyle("width",i),n.removeClass("image_resized",i))})),e.conversion.for("upcast").attributeToAttribute({view:{name:"figure",styles:{width:/.+/}},model:{key:"width",value:e=>e.getStyle("width")}})}}var dm=' ';const hm={small:' ',medium:dm,large:' ',original:' '};class um extends jl{static get requires(){return[cm]}static get pluginName(){return"ImageResizeButtons"}constructor(e){super(e),this._resizeUnit=e.config.get("image.resizeUnit")}init(){const e=this.editor,t=e.config.get("image.resizeOptions"),o=e.commands.get("imageResize");this.bind("isEnabled").to(o);for(const e of t)this._registerImageResizeButton(e);this._registerImageResizeDropdown(t)}_registerImageResizeButton(e){const t=this.editor,{name:o,value:n,icon:i}=e,r=n?n+this._resizeUnit:null;t.ui.componentFactory.add(o,n=>{const s=new Cc(n),a=t.commands.get("imageResize"),l=this._getOptionLabelValue(e,!0);if(!hm[i])throw new mo.b('imageresizebuttons-missing-icon: The resize option "'+o+'" misses the "icon" property or the property value doesn\'t match any of the available icons.',t,e);return s.set({label:l,icon:hm[i],tooltip:l,isToggleable:!0}),s.bind("isEnabled").to(this),s.bind("isOn").to(a,"value",mm(r)),this.listenTo(s,"execute",()=>{t.execute("imageResize",{width:r})}),s})}_registerImageResizeDropdown(e){const t=this.editor,o=t.t,n=e.find(e=>!e.value);t.ui.componentFactory.add("imageResize",i=>{const r=t.commands.get("imageResize"),s=qc(i,Fc),a=s.buttonView;return a.set({tooltip:o("Resize image"),commandValue:n.value,icon:dm,isToggleable:!0,label:this._getOptionLabelValue(n),withText:!0,class:"ck-resize-image-button"}),a.bind("label").to(r,"value",e=>e&&e.width?e.width:this._getOptionLabelValue(n)),s.bind("isOn").to(r),s.bind("isEnabled").to(this),$c(s,this._getResizeDropdownListItemDefinitions(e,r)),s.listView.ariaLabel=o("Image resize list"),this.listenTo(s,"execute",e=>{t.execute(e.source.commandName,{width:e.source.commandValue}),t.editing.view.focus()}),s})}_getOptionLabelValue(e,t){const o=this.editor.t;return e.label?e.label:t?e.value?o("Resize image to %0",e.value+this._resizeUnit):o("Resize image to the original size"):e.value?e.value+this._resizeUnit:o("Original")}_getResizeDropdownListItemDefinitions(e,t){const o=new Ao;return e.map(e=>{const n=e.value?e.value+this._resizeUnit:null,i={type:"button",model:new bh({commandName:"imageResize",commandValue:n,label:this._getOptionLabelValue(e),withText:!0,icon:null})};i.model.bind("isOn").to(t,"value",mm(n)),o.add(i)}),o}}function mm(e){return t=>null===e&&t===e||t&&t.width===e}class gm{constructor(e){this.set("activeHandlePosition",null),this.set("proposedWidthPercents",null),this.set("proposedWidth",null),this.set("proposedHeight",null),this.set("proposedHandleHostWidth",null),this.set("proposedHandleHostHeight",null),this._options=e,this._referenceCoordinates=null}begin(e,t,o){const n=new is(t);this.activeHandlePosition=function(e){const t=["top-left","top-right","bottom-right","bottom-left"];for(const o of t)if(e.classList.contains("ck-widget__resizer__handle-"+o))return o}(e),this._referenceCoordinates=function(e,t){const o=new is(e),n=t.split("-"),i={x:"right"==n[1]?o.right:o.left,y:"bottom"==n[0]?o.bottom:o.top};return i.x+=e.ownerDocument.defaultView.scrollX,i.y+=e.ownerDocument.defaultView.scrollY,i}(t,function(e){const t=e.split("-"),o={top:"bottom",bottom:"top",left:"right",right:"left"};return`${o[t[0]]}-${o[t[1]]}`}(this.activeHandlePosition)),this.originalWidth=n.width,this.originalHeight=n.height,this.aspectRatio=n.width/n.height;const i=o.style.width;i&&i.match(/^\d+\.?\d*%$/)?this.originalWidthPercents=parseFloat(i):this.originalWidthPercents=function(e,t){const o=e.parentElement,n=parseFloat(o.ownerDocument.defaultView.getComputedStyle(o).width);return t.width/n*100}(o,n)}update(e){this.proposedWidth=e.width,this.proposedHeight=e.height,this.proposedWidthPercents=e.widthPercents,this.proposedHandleHostWidth=e.handleHostWidth,this.proposedHandleHostHeight=e.handleHostHeight}}Co(gm,qn);class fm{constructor(e){this._options=e,this._domResizerWrapper=null,this._viewResizerWrapper=null,this.set("isEnabled",!0),this.decorate("begin"),this.decorate("cancel"),this.decorate("commit"),this.decorate("updateSize"),this.on("commit",e=>{this.state.proposedWidth||this.state.proposedWidthPercents||(this._cleanup(),e.stop())},{priority:"high"}),this.on("change:isEnabled",()=>{this.isEnabled&&this.redraw()})}attach(){const e=this,t=this._options.viewElement;this._options.editor.editing.view.change(o=>{const n=o.createUIElement("div",{class:"ck ck-reset_all ck-widget__resizer"},(function(t){const o=this.toDomElement(t);return e._appendHandles(o),e._appendSizeUI(o),e._domResizerWrapper=o,e.on("change:isEnabled",(e,t,n)=>{o.style.display=n?"":"none"}),o.style.display=e.isEnabled?"":"none",o}));o.insert(o.createPositionAt(t,"end"),n),o.addClass("ck-widget_with-resizer",t),this._viewResizerWrapper=n})}begin(e){this.state=new gm(this._options),this._sizeUI.bindToState(this._options,this.state),this._initialViewWidth=this._options.viewElement.getStyle("width"),this.state.begin(e,this._getHandleHost(),this._getResizeHost())}updateSize(e){const t=this._proposeNewSize(e);this._options.editor.editing.view.change(e=>{const o=this._options.unit||"%",n=("%"===o?t.widthPercents:t.width)+o;e.setStyle("width",n,this._options.viewElement)});const o=this._getHandleHost(),n=new is(o);t.handleHostWidth=Math.round(n.width),t.handleHostHeight=Math.round(n.height);const i=new is(o);t.width=Math.round(i.width),t.height=Math.round(i.height),this.redraw(n),this.state.update(t)}commit(){const e=this._options.unit||"%",t=("%"===e?this.state.proposedWidthPercents:this.state.proposedWidth)+e;this._options.editor.editing.view.change(()=>{this._cleanup(),this._options.onCommit(t)})}cancel(){this._cleanup()}destroy(){this.cancel()}redraw(e){const t=this._domResizerWrapper;if(!((o=t)&&o.ownerDocument&&o.ownerDocument.contains(o)))return;var o;const n=t.parentElement,i=this._getHandleHost(),r=this._viewResizerWrapper,s=[r.getStyle("width"),r.getStyle("height"),r.getStyle("left"),r.getStyle("top")];let a;if(n.isSameNode(i)){const t=e||new is(i);a=[t.width+"px",t.height+"px",void 0,void 0]}else a=[i.offsetWidth+"px",i.offsetHeight+"px",i.offsetLeft+"px",i.offsetTop+"px"];"same"!==Vo(s,a)&&this._options.editor.editing.view.change(e=>{e.setStyle({width:a[0],height:a[1],left:a[2],top:a[3]},r)})}containsHandle(e){return this._domResizerWrapper.contains(e)}static isResizeHandle(e){return e.classList.contains("ck-widget__resizer__handle")}_cleanup(){this._sizeUI.dismiss(),this._sizeUI.isVisible=!1;this._options.editor.editing.view.change(e=>{e.setStyle("width",this._initialViewWidth,this._options.viewElement)})}_proposeNewSize(e){const t=this.state,o={x:(n=e).pageX,y:n.pageY};var n;const i=!this._options.isCentered||this._options.isCentered(this),r={x:t._referenceCoordinates.x-(o.x+t.originalWidth),y:o.y-t.originalHeight-t._referenceCoordinates.y};i&&t.activeHandlePosition.endsWith("-right")&&(r.x=o.x-(t._referenceCoordinates.x+t.originalWidth)),i&&(r.x*=2);const s={width:Math.abs(t.originalWidth+r.x),height:Math.abs(t.originalHeight+r.y)};s.dominant=s.width/t.aspectRatio>s.height?"width":"height",s.max=s[s.dominant];const a={width:s.width,height:s.height};return"width"==s.dominant?a.height=a.width/t.aspectRatio:a.width=a.height*t.aspectRatio,{width:Math.round(a.width),height:Math.round(a.height),widthPercents:Math.min(Math.round(t.originalWidthPercents/t.originalWidth*a.width*100)/100,100)}}_getResizeHost(){const e=this._domResizerWrapper.parentElement;return this._options.getResizeHost(e)}_getHandleHost(){const e=this._domResizerWrapper.parentElement;return this._options.getHandleHost(e)}_appendHandles(e){const t=["top-left","top-right","bottom-right","bottom-left"];for(const n of t)e.appendChild(new $l({tag:"div",attributes:{class:"ck-widget__resizer__handle "+(o=n,"ck-widget__resizer__handle-"+o)}}).render());var o}_appendSizeUI(e){const t=new pm;t.render(),this._sizeUI=t,e.appendChild(t.element)}}Co(fm,qn);class pm extends dc{constructor(){super();const e=this.bindTemplate;this.setTemplate({tag:"div",attributes:{class:["ck","ck-size-view",e.to("activeHandlePosition",e=>e?"ck-orientation-"+e:"")],style:{display:e.if("isVisible","none",e=>!e)}},children:[{text:e.to("label")}]})}bindToState(e,t){this.bind("isVisible").to(t,"proposedWidth",t,"proposedHeight",(e,t)=>null!==e&&null!==t),this.bind("label").to(t,"proposedHandleHostWidth",t,"proposedHandleHostHeight",t,"proposedWidthPercents",(t,o,n)=>"px"===e.unit?`${t}×${o}`:n+"%"),this.bind("activeHandlePosition").to(t)}dismiss(){this.unbind(),this.isVisible=!1}}var bm=function(e,t,o){var n=!0,i=!0;if("function"!=typeof e)throw new TypeError("Expected a function");return B(o)&&(n="leading"in o?!!o.leading:n,i="trailing"in o?!!o.trailing:i),Jr(e,t,{leading:n,maxWait:t,trailing:i})};o(80);class wm extends jl{static get pluginName(){return"WidgetResize"}init(){this.set("_visibleResizer",null),this.set("_activeResizer",null),this._resizers=new Map;const e=rr.window.document;this.editor.model.schema.setAttributeProperties("width",{isFormatting:!0}),this.editor.editing.view.addObserver(qh),this._observer=Object.create(gr),this.listenTo(this.editor.editing.view.document,"mousedown",this._mouseDownListener.bind(this),{priority:"high"}),this._observer.listenTo(e,"mousemove",this._mouseMoveListener.bind(this)),this._observer.listenTo(e,"mouseup",this._mouseUpListener.bind(this));const t=()=>{this._visibleResizer&&this._visibleResizer.redraw()},o=bm(t,200);this.on("change:_visibleResizer",t),this.editor.ui.on("update",o),this._observer.listenTo(rr.window,"resize",o);const n=this.editor.editing.view.document.selection;n.on("change",()=>{const e=n.getSelectedElement();this._visibleResizer=this._getResizerByViewElement(e)||null})}destroy(){this._observer.stopListening();for(const e of this._resizers.values())e.destroy()}attachTo(e){const t=new fm(e),o=this.editor.plugins;if(t.attach(),o.has("WidgetToolbarRepository")){const e=o.get("WidgetToolbarRepository");t.on("begin",()=>{e.forceDisabled("resize")},{priority:"lowest"}),t.on("cancel",()=>{e.clearForceDisabled("resize")},{priority:"highest"}),t.on("commit",()=>{e.clearForceDisabled("resize")},{priority:"highest"})}return this._resizers.set(e.viewElement,t),t}_getResizerByHandle(e){for(const t of this._resizers.values())if(t.containsHandle(e))return t}_getResizerByViewElement(e){return this._resizers.get(e)}_mouseDownListener(e,t){const o=t.domTarget;fm.isResizeHandle(o)&&(this._activeResizer=this._getResizerByHandle(o),this._activeResizer&&(this._activeResizer.begin(o),e.stop(),t.preventDefault()))}_mouseMoveListener(e,t){this._activeResizer&&this._activeResizer.updateSize(t)}_mouseUpListener(){this._activeResizer&&(this._activeResizer.commit(),this._activeResizer=null)}}Co(wm,qn);class km extends jl{static get requires(){return[wm]}static get pluginName(){return"ImageResizeHandles"}init(){const e=this.editor,t=e.commands.get("imageResize");this.bind("isEnabled").to(t),e.editing.downcastDispatcher.on("insert:image",(t,o,n)=>{const i=n.mapper.toViewElement(o.item),r=e.plugins.get(wm).attachTo({unit:e.config.get("image.resizeUnit"),modelElement:o.item,viewElement:i,editor:e,getHandleHost:e=>e.querySelector("img"),getResizeHost:e=>e,isCentered(){const e=o.item.getAttribute("imageStyle");return!e||"full"==e||"alignCenter"==e},onCommit(t){e.execute("imageResize",{width:t})}});r.on("updateSize",()=>{i.hasClass("image_resized")||e.editing.view.change(e=>{e.addClass("image_resized",i)})}),r.bind("isEnabled").to(this)},{priority:"low"})}}o(82);class _m{constructor(e,t=20){this.model=e,this.size=0,this.limit=t,this.isLocked=!1,this._changeCallback=(e,t)=>{"transparent"!=t.type&&t!==this._batch&&this._reset(!0)},this._selectionChangeCallback=()=>{this._reset()},this.model.document.on("change",this._changeCallback),this.model.document.selection.on("change:range",this._selectionChangeCallback),this.model.document.selection.on("change:attribute",this._selectionChangeCallback)}get batch(){return this._batch||(this._batch=this.model.createBatch()),this._batch}input(e){this.size+=e,this.size>=this.limit&&this._reset(!0)}lock(){this.isLocked=!0}unlock(){this.isLocked=!1}destroy(){this.model.document.off("change",this._changeCallback),this.model.document.selection.off("change:range",this._selectionChangeCallback),this.model.document.selection.off("change:attribute",this._selectionChangeCallback)}_reset(e){this.isLocked&&!e||(this._batch=null,this.size=0)}}class vm extends Vd{constructor(e,t){super(e),this._buffer=new _m(e.model,t),this._batches=new WeakSet}get buffer(){return this._buffer}destroy(){super.destroy(),this._buffer.destroy()}execute(e={}){const t=this.editor.model,o=t.document,n=e.text||"",i=n.length,r=e.range?t.createSelection(e.range):o.selection,s=e.resultRange;t.enqueueChange(this._buffer.batch,e=>{this._buffer.lock(),this._batches.add(this._buffer.batch),t.deleteContent(r),n&&t.insertContent(e.createText(n,o.selection.getAttributes()),r),s?e.setSelection(s):r.is("documentSelection")||e.setSelection(r),this._buffer.unlock(),this._buffer.input(i)})}}function ym(e){if(e.newChildren.length-e.oldChildren.length!=1)return;const t=function(e,t){const o=[];let n,i=0;return e.forEach(e=>{"equal"==e?(r(),i++):"insert"==e?(s("insert")?n.values.push(t[i]):(r(),n={type:"insert",index:i,values:[t[i]]}),i++):s("delete")?n.howMany++:(r(),n={type:"delete",index:i,howMany:1})}),r(),o;function r(){n&&(o.push(n),n=null)}function s(e){return n&&n.type==e}}(Qi(e.oldChildren,e.newChildren,xm),e.newChildren);if(t.length>1)return;const o=t[0];return o.values[0]&&o.values[0].is("$text")?o:void 0}function xm(e,t){return e&&e.is("$text")&&t&&t.is("$text")?e.data===t.data:e===t}class Cm{constructor(e){this.editor=e,this.editing=this.editor.editing}handle(e,t){if(function(e){if(0==e.length)return!1;for(const t of e)if("children"===t.type&&!ym(t))return!0;return!1}(e))this._handleContainerChildrenMutations(e,t);else for(const o of e)this._handleTextMutation(o,t),this._handleTextNodeInsertion(o)}_handleContainerChildrenMutations(e,t){const o=function(e){const t=e.map(e=>e.node).reduce((e,t)=>e.getCommonAncestor(t,{includeSelf:!0}));if(!t)return;return t.getAncestors({includeSelf:!0,parentFirst:!0}).find(e=>e.is("containerElement")||e.is("rootElement"))}(e);if(!o)return;const n=this.editor.editing.view.domConverter.mapViewToDom(o),i=new cr(this.editor.editing.view.document),r=this.editor.data.toModel(i.domToView(n)).getChild(0),s=this.editor.editing.mapper.toModelElement(o);if(!s)return;const a=Array.from(r.getChildren()),l=Array.from(s.getChildren()),c=a[a.length-1],d=l[l.length-1],h=c&&c.is("element","softBreak"),u=d&&!d.is("element","softBreak");h&&u&&a.pop();const m=this.editor.model.schema;if(!Am(a,m)||!Am(l,m))return;const g=a.map(e=>e.is("$text")?e.data:"@").join("").replace(/\u00A0/g," "),f=l.map(e=>e.is("$text")?e.data:"@").join("").replace(/\u00A0/g," ");if(f===g)return;const p=Qi(f,g),{firstChangeAt:b,insertions:w,deletions:k}=Tm(p);let _=null;t&&(_=this.editing.mapper.toModelRange(t.getFirstRange()));const v=g.substr(b,w),y=this.editor.model.createRange(this.editor.model.createPositionAt(s,b),this.editor.model.createPositionAt(s,b+k));this.editor.execute("input",{text:v,range:y,resultRange:_})}_handleTextMutation(e,t){if("text"!=e.type)return;const o=e.newText.replace(/\u00A0/g," "),n=e.oldText.replace(/\u00A0/g," ");if(n===o)return;const i=Qi(n,o),{firstChangeAt:r,insertions:s,deletions:a}=Tm(i);let l=null;t&&(l=this.editing.mapper.toModelRange(t.getFirstRange()));const c=this.editing.view.createPositionAt(e.node,r),d=this.editing.mapper.toModelPosition(c),h=this.editor.model.createRange(d,d.getShiftedBy(a)),u=o.substr(r,s);this.editor.execute("input",{text:u,range:h,resultRange:l})}_handleTextNodeInsertion(e){if("children"!=e.type)return;const t=ym(e),o=this.editing.view.createPositionAt(e.node,t.index),n=this.editing.mapper.toModelPosition(o),i=t.values[0].data;this.editor.execute("input",{text:i.replace(/\u00A0/g," "),range:this.editor.model.createRange(n)})}}function Am(e,t){return e.every(e=>t.isInline(e))}function Tm(e){let t=null,o=null;for(let n=0;n{o.deleteContent(o.document.selection)}),e.unlock()}mi.isAndroid?n.document.on("beforeinput",(e,t)=>r(t),{priority:"lowest"}):n.document.on("keydown",(e,t)=>r(t),{priority:"lowest"}),n.document.on("compositionstart",(function(){const e=o.document,t=1!==e.selection.rangeCount||e.selection.getFirstRange().isFlat;if(e.selection.isCollapsed||t)return;s()}),{priority:"lowest"}),n.document.on("compositionend",()=>{t=o.createSelection(o.document.selection)},{priority:"lowest"})}(e),function(e){e.editing.view.document.on("mutations",(t,o,n)=>{new Cm(e).handle(o,n)})}(e)}isInput(e){return this.editor.commands.get("input")._batches.has(e)}}class Sm{constructor(){this._definitions=new Set}get length(){return this._definitions.size}add(e){Array.isArray(e)?e.forEach(e=>this._definitions.add(e)):this._definitions.add(e)}getDispatcher(){return e=>{e.on("attribute:linkHref",(e,t,o)=>{if(!o.consumable.test(t.item,"attribute:linkHref"))return;const n=o.writer,i=n.document.selection;for(const e of this._definitions){const r=n.createAttributeElement("a",e.attributes,{priority:5});n.setCustomProperty("link",!0,r),e.callback(t.attributeNewValue)?t.item.is("selection")?n.wrap(i.getFirstRange(),r):n.wrap(o.mapper.toViewRange(t.range),r):n.unwrap(o.mapper.toViewRange(t.range),r)}},{priority:"high"})}}getDispatcherForLinkedImage(){return e=>{e.on("attribute:linkHref:image",(e,t,o)=>{const n=o.mapper.toViewElement(t.item),i=Array.from(n.getChildren()).find(e=>"a"===e.name);for(const e of this._definitions){const n=Bo(e.attributes);if(e.callback(t.attributeNewValue))for(const[e,t]of n)"class"===e?o.writer.addClass(t,i):o.writer.setAttribute(e,t,i);else for(const[e,t]of n)"class"===e?o.writer.removeClass(t,i):o.writer.removeAttribute(e,i)}})}}}var Em=function(e,t,o){var n=e.length;return o=void 0===o?n:o,!t&&o>=n?e:rn(e,t,o)},Rm=RegExp("[\\u200d\\ud800-\\udfff\\u0300-\\u036f\\ufe20-\\ufe2f\\u20d0-\\u20ff\\ufe0e\\ufe0f]");var Im=function(e){return Rm.test(e)};var Vm=function(e){return e.split("")},Om="[\\ud800-\\udfff]",Mm="[\\u0300-\\u036f\\ufe20-\\ufe2f\\u20d0-\\u20ff]",Nm="\\ud83c[\\udffb-\\udfff]",zm="[^\\ud800-\\udfff]",Bm="(?:\\ud83c[\\udde6-\\uddff]){2}",Fm="[\\ud800-\\udbff][\\udc00-\\udfff]",Dm="(?:"+Mm+"|"+Nm+")"+"?",Lm="[\\ufe0e\\ufe0f]?"+Dm+("(?:\\u200d(?:"+[zm,Bm,Fm].join("|")+")[\\ufe0e\\ufe0f]?"+Dm+")*"),Hm="(?:"+[zm+Mm+"?",Mm,Bm,Fm,Om].join("|")+")",jm=RegExp(Nm+"(?="+Nm+")|"+Hm+Lm,"g");var Wm=function(e){return e.match(jm)||[]};var qm=function(e){return Im(e)?Wm(e):Vm(e)};var $m=function(e){return function(t){t=Zo(t);var o=Im(t)?qm(t):void 0,n=o?o[0]:t.charAt(0),i=o?Em(o,1).join(""):t.slice(1);return n[e]()+i}}("toUpperCase");const Um=/[\u0000-\u0020\u00A0\u1680\u180E\u2000-\u2029\u205f\u3000]/g,Gm=/^(?:(?:https?|ftps?|mailto):|[^a-z]|[a-z+.-]+(?:[^a-z+.:-]|$))/i;function Km(e,{writer:t}){const o=t.createAttributeElement("a",{href:e},{priority:5});return t.setCustomProperty("link",!0,o),o}function Jm(e){return function(e){return e.replace(Um,"").match(Gm)}(e=String(e))?e:"#"}function Ym(e,t){return!!e&&(e.is("element","image")&&t.checkAttribute("image","linkHref"))}class Qm extends Vd{constructor(e){super(e),this.manualDecorators=new Ao,this.automaticDecorators=new Sm}restoreManualDecoratorStates(){for(const e of this.manualDecorators)e.value=this._getDecoratorStateFromModel(e.id)}refresh(){const e=this.editor.model,t=e.document,o=Pd(t.selection.getSelectedBlocks());Ym(o,e.schema)?(this.value=o.getAttribute("linkHref"),this.isEnabled=e.schema.checkAttribute(o,"linkHref")):(this.value=t.selection.getAttribute("linkHref"),this.isEnabled=e.schema.checkAttributeInSelection(t.selection,"linkHref"));for(const e of this.manualDecorators)e.value=this._getDecoratorStateFromModel(e.id)}execute(e,t={}){const o=this.editor.model,n=o.document.selection,i=[],r=[];for(const e in t)t[e]?i.push(e):r.push(e);o.change(t=>{if(n.isCollapsed){const s=n.getFirstPosition();if(n.hasAttribute("linkHref")){const a=Xd(s,"linkHref",n.getAttribute("linkHref"),o);t.setAttribute("linkHref",e,a),i.forEach(e=>{t.setAttribute(e,!0,a)}),r.forEach(e=>{t.removeAttribute(e,a)}),t.setSelection(t.createPositionAfter(a.end.nodeBefore))}else if(""!==e){const r=Bo(n.getAttributes());r.set("linkHref",e),i.forEach(e=>{r.set(e,!0)});const a=t.createText(e,r);o.insertContent(a,s),t.setSelection(t.createPositionAfter(a))}["linkHref",...i,...r].forEach(e=>{t.removeSelectionAttribute(e)})}else{const s=o.schema.getValidRanges(n.getRanges(),"linkHref"),a=[];for(const e of n.getSelectedBlocks())o.schema.checkAttribute(e,"linkHref")&&a.push(t.createRangeOn(e));const l=a.slice();for(const e of s)this._isRangeToUpdate(e,a)&&l.push(e);for(const o of l)t.setAttribute("linkHref",e,o),i.forEach(e=>{t.setAttribute(e,!0,o)}),r.forEach(e=>{t.removeAttribute(e,o)})}})}_getDecoratorStateFromModel(e){const t=this.editor.model,o=t.document,n=Pd(o.selection.getSelectedBlocks());return Ym(n,t.schema)?n.getAttribute(e):o.selection.getAttribute(e)}_isRangeToUpdate(e,t){for(const o of t)if(o.containsRange(e))return!1;return!0}}class Xm extends Vd{refresh(){const e=this.editor.model,t=e.document,o=Pd(t.selection.getSelectedBlocks());Ym(o,e.schema)?this.isEnabled=e.schema.checkAttribute(o,"linkHref"):this.isEnabled=e.schema.checkAttributeInSelection(t.selection,"linkHref")}execute(){const e=this.editor,t=this.editor.model,o=t.document.selection,n=e.commands.get("link");t.change(e=>{const i=o.isCollapsed?[Xd(o.getFirstPosition(),"linkHref",o.getAttribute("linkHref"),t)]:o.getRanges();for(const t of i)if(e.removeAttribute("linkHref",t),n)for(const o of n.manualDecorators)e.removeAttribute(o.id,t)})}}class Zm{constructor({id:e,label:t,attributes:o,defaultValue:n}){this.id=e,this.set("value"),this.defaultValue=n,this.label=t,this.attributes=o}}Co(Zm,qn);o(84);const eg=/^(https?:)?\/\//;class tg extends jl{static get pluginName(){return"LinkEditing"}static get requires(){return[Gd,Pm,om]}constructor(e){super(e),e.config.define("link",{addTargetToExternalLinks:!1})}init(){const e=this.editor;e.model.schema.extend("$text",{allowAttributes:"linkHref"}),e.conversion.for("dataDowncast").attributeToElement({model:"linkHref",view:Km}),e.conversion.for("editingDowncast").attributeToElement({model:"linkHref",view:(e,t)=>Km(Jm(e),t)}),e.conversion.for("upcast").elementToAttribute({view:{name:"a",attributes:{href:!0}},model:{key:"linkHref",value:e=>e.getAttribute("href")}}),e.commands.add("link",new Qm(e)),e.commands.add("unlink",new Xm(e));const t=function(e,t){const o={"Open in a new tab":e("Open in a new tab"),Downloadable:e("Downloadable")};return t.forEach(e=>(e.label&&o[e.label]&&(e.label=o[e.label]),e)),t}(e.t,function(e){const t=[];if(e)for(const[o,n]of Object.entries(e)){const e=Object.assign({},n,{id:"link"+$m(o)});t.push(e)}return t}(e.config.get("link.decorators")));this._enableAutomaticDecorators(t.filter(e=>"automatic"===e.mode)),this._enableManualDecorators(t.filter(e=>"manual"===e.mode));e.plugins.get(Gd).registerAttribute("linkHref"),eh(e,"linkHref","a","ck-link_selected"),this._enableInsertContentSelectionAttributesFixer(),this._enableClickingAfterLink(),this._enableTypingOverLink(),this._handleDeleteContentAfterLink()}_enableAutomaticDecorators(e){const t=this.editor,o=t.commands.get("link").automaticDecorators;t.config.get("link.addTargetToExternalLinks")&&o.add({id:"linkIsExternal",mode:"automatic",callback:e=>eg.test(e),attributes:{target:"_blank",rel:"noopener noreferrer"}}),o.add(e),o.length&&t.conversion.for("downcast").add(o.getDispatcher())}_enableManualDecorators(e){if(!e.length)return;const t=this.editor,o=t.commands.get("link").manualDecorators;e.forEach(e=>{t.model.schema.extend("$text",{allowAttributes:e.id}),o.add(new Zm(e)),t.conversion.for("downcast").attributeToElement({model:e.id,view:(t,{writer:n})=>{if(t){const t=o.get(e.id).attributes,i=n.createAttributeElement("a",t,{priority:5});return n.setCustomProperty("link",!0,i),i}}}),t.conversion.for("upcast").elementToAttribute({view:{name:"a",attributes:o.get(e.id).attributes},model:{key:e.id}})})}_enableInsertContentSelectionAttributesFixer(){const e=this.editor,t=e.model,o=t.document.selection,n=e.commands.get("link");this.listenTo(t,"insertContent",()=>{const e=o.anchor.nodeBefore,i=o.anchor.nodeAfter;o.hasAttribute("linkHref")&&e&&e.hasAttribute("linkHref")&&(i&&i.hasAttribute("linkHref")||t.change(e=>{og(e,n.manualDecorators)}))},{priority:"low"})}_enableClickingAfterLink(){const e=this.editor,t=e.commands.get("link");e.editing.view.addObserver(qh);let o=!1;this.listenTo(e.editing.view.document,"mousedown",()=>{o=!0}),this.listenTo(e.editing.view.document,"selectionChange",()=>{if(!o)return;o=!1;const n=e.model.document.selection;if(!n.isCollapsed)return;if(!n.hasAttribute("linkHref"))return;const i=n.getFirstPosition(),r=Xd(i,"linkHref",n.getAttribute("linkHref"),e.model);(i.isTouching(r.start)||i.isTouching(r.end))&&e.model.change(e=>{og(e,t.manualDecorators)})})}_enableTypingOverLink(){const e=this.editor,t=e.editing.view;let o,n;this.listenTo(t.document,"delete",()=>{n=!0},{priority:"high"}),this.listenTo(e.model,"deleteContent",()=>{const t=e.model.document.selection;t.isCollapsed||(n?n=!1:ng(e)&&function(e){const t=e.document.selection,o=t.getFirstPosition(),n=t.getLastPosition(),i=o.nodeAfter;if(!i)return!1;if(!i.is("$text"))return!1;if(!i.hasAttribute("linkHref"))return!1;const r=n.textNode||n.nodeBefore;if(i===r)return!0;return Xd(o,"linkHref",i.getAttribute("linkHref"),e).containsRange(e.createRange(o,n),!0)}(e.model)&&(o=t.getAttributes()))},{priority:"high"}),this.listenTo(e.model,"insertContent",(t,[i])=>{n=!1,ng(e)&&o&&(e.model.change(e=>{for(const[t,n]of o)e.setAttribute(t,n,i)}),o=null)},{priority:"high"})}_handleDeleteContentAfterLink(){const e=this.editor,t=e.model,o=t.document.selection,n=e.editing.view,i=e.commands.get("link");let r=!1,s=!1;this.listenTo(n.document,"delete",(e,t)=>{s=t.domEvent.keyCode===pi.backspace},{priority:"high"}),this.listenTo(t,"deleteContent",()=>{r=!1;const e=o.getFirstPosition(),n=o.getAttribute("linkHref");if(!n)return;const i=Xd(e,"linkHref",n,t);r=i.containsPosition(e)||i.end.isEqual(e)},{priority:"high"}),this.listenTo(t,"deleteContent",()=>{s&&(s=!1,r||e.model.enqueueChange(e=>{og(e,i.manualDecorators)}))},{priority:"low"})}}function og(e,t){e.removeSelectionAttribute("linkHref");for(const o of t)e.removeSelectionAttribute(o.id)}function ng(e){return e.plugins.get("Input").isInput(e.model.change(e=>e.batch))}class ig extends Fr{constructor(e){super(e),this.domEventType="click"}onDomEvent(e){this.fire(e.type,e)}}o(86);class rg extends dc{constructor(e,t,o){super(e);const n=e.t;this.focusTracker=new Ac,this.keystrokes=new Bl,this.urlInputView=this._createUrlInput(o),this.saveButtonView=this._createButton(n("Save"),cu,"ck-button-save"),this.saveButtonView.type="submit",this.cancelButtonView=this._createButton(n("Cancel"),du,"ck-button-cancel","cancel"),this._manualDecoratorSwitches=this._createManualDecoratorSwitches(t),this.children=this._createFormChildren(t.manualDecorators),this._focusables=new ql,this._focusCycler=new Rc({focusables:this._focusables,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:"shift + tab",focusNext:"tab"}});const i=["ck","ck-link-form"];t.manualDecorators.length&&i.push("ck-link-form_layout-vertical"),this.setTemplate({tag:"form",attributes:{class:i,tabindex:"-1"},children:this.children})}getDecoratorSwitchesState(){return Array.from(this._manualDecoratorSwitches).reduce((e,t)=>(e[t.name]=t.isOn,e),{})}render(){super.render(),lu({view:this});[this.urlInputView,...this._manualDecoratorSwitches,this.saveButtonView,this.cancelButtonView].forEach(e=>{this._focusables.add(e),this.focusTracker.add(e.element)}),this.keystrokes.listenTo(this.element)}focus(){this._focusCycler.focusFirst()}_createUrlInput(e="https://"){const t=this.locale.t,o=new iu(this.locale,su);return o.label=t("Link URL"),o.fieldView.placeholder=e+"example.com",o}_createButton(e,t,o,n){const i=new Cc(this.locale);return i.set({label:e,icon:t,tooltip:!0}),i.extendTemplate({attributes:{class:o}}),n&&i.delegate("execute").to(this,n),i}_createManualDecoratorSwitches(e){const t=this.createCollection();for(const o of e.manualDecorators){const n=new jc(this.locale);n.set({name:o.id,label:o.label,withText:!0}),n.bind("isOn").toMany([o,e],"value",(e,t)=>void 0===t&&void 0===e?o.defaultValue:e),n.on("execute",()=>{o.set("value",!n.isOn)}),t.add(n)}return t}_createFormChildren(e){const t=this.createCollection();if(t.add(this.urlInputView),e.length){const e=new dc;e.setTemplate({tag:"ul",children:this._manualDecoratorSwitches.map(e=>({tag:"li",children:[e],attributes:{class:["ck","ck-list__item"]}})),attributes:{class:["ck","ck-reset","ck-list"]}}),t.add(e)}return t.add(this.saveButtonView),t.add(this.cancelButtonView),t}}o(88);class sg extends dc{constructor(e){super(e);const t=e.t;this.focusTracker=new Ac,this.keystrokes=new Bl,this.previewButtonView=this._createPreviewButton(),this.unlinkButtonView=this._createButton(t("Unlink"),' ',"unlink"),this.editButtonView=this._createButton(t("Edit link"),' ',"edit"),this.set("href"),this._focusables=new ql,this._focusCycler=new Rc({focusables:this._focusables,focusTracker:this.focusTracker,keystrokeHandler:this.keystrokes,actions:{focusPrevious:"shift + tab",focusNext:"tab"}}),this.setTemplate({tag:"div",attributes:{class:["ck","ck-link-actions"],tabindex:"-1"},children:[this.previewButtonView,this.editButtonView,this.unlinkButtonView]})}render(){super.render();[this.previewButtonView,this.editButtonView,this.unlinkButtonView].forEach(e=>{this._focusables.add(e),this.focusTracker.add(e.element)}),this.keystrokes.listenTo(this.element)}focus(){this._focusCycler.focusFirst()}_createButton(e,t,o){const n=new Cc(this.locale);return n.set({label:e,icon:t,tooltip:!0}),n.delegate("execute").to(this,o),n}_createPreviewButton(){const e=new Cc(this.locale),t=this.bindTemplate,o=this.t;return e.set({withText:!0,tooltip:o("Open link in new tab")}),e.extendTemplate({attributes:{class:["ck","ck-link-actions__preview"],href:t.to("href",e=>e&&Jm(e)),target:"_blank",rel:"noopener noreferrer"}}),e.bind("label").to(this,"href",e=>e||o("This link has no URL")),e.bind("isEnabled").to(this,"href",e=>!!e),e.template.tag="a",e.template.eventListeners={},e}}const ag=/^((\w+:(\/{2,})?)|(\W))/i,lg=/[\w-]+@[\w-]+\.+[\w-]+/i;class cg extends jl{static get requires(){return[Pc]}static get pluginName(){return"LinkUI"}init(){const e=this.editor;e.editing.view.addObserver(ig),this.actionsView=this._createActionsView(),this.formView=this._createFormView(),this._balloon=e.plugins.get(Pc),this._createToolbarLinkButton(),this._enableUserBalloonInteractions(),e.conversion.for("editingDowncast").markerToHighlight({model:"link-ui",view:{classes:["ck-fake-link-selection"]}}),e.conversion.for("editingDowncast").markerToElement({model:"link-ui",view:{name:"span",classes:["ck-fake-link-selection","ck-fake-link-selection_collapsed"]}})}destroy(){super.destroy(),this.formView.destroy()}_createActionsView(){const e=this.editor,t=new sg(e.locale),o=e.commands.get("link"),n=e.commands.get("unlink");return t.bind("href").to(o,"value"),t.editButtonView.bind("isEnabled").to(o),t.unlinkButtonView.bind("isEnabled").to(n),this.listenTo(t,"edit",()=>{this._addFormView()}),this.listenTo(t,"unlink",()=>{e.execute("unlink"),this._hideUI()}),t.keystrokes.set("Esc",(e,t)=>{this._hideUI(),t()}),t.keystrokes.set("Ctrl+K",(e,t)=>{this._addFormView(),t()}),t}_createFormView(){const e=this.editor,t=e.commands.get("link"),o=e.config.get("link.defaultProtocol"),n=new rg(e.locale,t,o);return n.urlInputView.fieldView.bind("value").to(t,"value"),n.urlInputView.bind("isReadOnly").to(t,"isEnabled",e=>!e),n.saveButtonView.bind("isEnabled").to(t),this.listenTo(n,"submit",()=>{const{value:t}=n.urlInputView.fieldView.element,i=!!o&&!ag.test(t),r=lg.test(t),s=t&&i?(r?"mailto:":o)+t:t;e.execute("link",s,n.getDecoratorSwitchesState()),this._closeFormView()}),this.listenTo(n,"cancel",()=>{this._closeFormView()}),n.keystrokes.set("Esc",(e,t)=>{this._closeFormView(),t()}),n}_createToolbarLinkButton(){const e=this.editor,t=e.commands.get("link"),o=e.t;e.keystrokes.set("Ctrl+K",(e,t)=>{t(),this._showUI(!0)}),e.ui.componentFactory.add("link",e=>{const n=new Cc(e);return n.isEnabled=!0,n.label=o("Link"),n.icon=' ',n.keystroke="Ctrl+K",n.tooltip=!0,n.isToggleable=!0,n.bind("isEnabled").to(t,"isEnabled"),n.bind("isOn").to(t,"value",e=>!!e),this.listenTo(n,"execute",()=>this._showUI(!0)),n})}_enableUserBalloonInteractions(){const e=this.editor.editing.view.document;this.listenTo(e,"click",()=>{this._getSelectedLinkElement()&&this._showUI()}),this.editor.keystrokes.set("Tab",(e,t)=>{this._areActionsVisible&&!this.actionsView.focusTracker.isFocused&&(this.actionsView.focus(),t())},{priority:"high"}),this.editor.keystrokes.set("Esc",(e,t)=>{this._isUIVisible&&(this._hideUI(),t())}),Wc({emitter:this.formView,activator:()=>this._isUIInPanel,contextElements:[this._balloon.view.element],callback:()=>this._hideUI()})}_addActionsView(){this._areActionsInPanel||this._balloon.add({view:this.actionsView,position:this._getBalloonPositionData()})}_addFormView(){if(this._isFormInPanel)return;const e=this.editor.commands.get("link");this._balloon.add({view:this.formView,position:this._getBalloonPositionData()}),this._balloon.visibleView===this.formView&&this.formView.urlInputView.fieldView.select(),this.formView.urlInputView.fieldView.element.value=e.value||""}_closeFormView(){const e=this.editor.commands.get("link");e.restoreManualDecoratorStates(),void 0!==e.value?this._removeFormView():this._hideUI()}_removeFormView(){this._isFormInPanel&&(this.formView.saveButtonView.focus(),this._balloon.remove(this.formView),this.editor.editing.view.focus(),this._hideFakeVisualSelection())}_showUI(e=!1){this._getSelectedLinkElement()?(this._areActionsVisible?this._addFormView():this._addActionsView(),e&&this._balloon.showStack("main")):(this._showFakeVisualSelection(),this._addActionsView(),e&&this._balloon.showStack("main"),this._addFormView()),this._startUpdatingUI()}_hideUI(){if(!this._isUIInPanel)return;const e=this.editor;this.stopListening(e.ui,"update"),this.stopListening(this._balloon,"change:visibleView"),e.editing.view.focus(),this._removeFormView(),this._balloon.remove(this.actionsView),this._hideFakeVisualSelection()}_startUpdatingUI(){const e=this.editor,t=e.editing.view.document;let o=this._getSelectedLinkElement(),n=r();const i=()=>{const e=this._getSelectedLinkElement(),t=r();o&&!e||!o&&t!==n?this._hideUI():this._isUIVisible&&this._balloon.updatePosition(this._getBalloonPositionData()),o=e,n=t};function r(){return t.selection.focus.getAncestors().reverse().find(e=>e.is("element"))}this.listenTo(e.ui,"update",i),this.listenTo(this._balloon,"change:visibleView",i)}get _isFormInPanel(){return this._balloon.hasView(this.formView)}get _areActionsInPanel(){return this._balloon.hasView(this.actionsView)}get _areActionsVisible(){return this._balloon.visibleView===this.actionsView}get _isUIInPanel(){return this._isFormInPanel||this._areActionsInPanel}get _isUIVisible(){return this._balloon.visibleView==this.formView||this._areActionsVisible}_getBalloonPositionData(){const e=this.editor.editing.view,t=this.editor.model,o=e.document,n=this._getSelectedLinkElement(),i=t.markers.has("link-ui")?this.editor.editing.mapper.toViewRange(t.markers.get("link-ui").getRange()):o.selection.getFirstRange();return{target:n?e.domConverter.mapViewToDom(n):e.domConverter.viewRangeToDom(i)}}_getSelectedLinkElement(){const e=this.editor.editing.view,t=e.document.selection;if(t.isCollapsed)return dg(t.getFirstPosition());{const o=t.getFirstRange().getTrimmed(),n=dg(o.start),i=dg(o.end);return n&&n==i&&e.createRangeIn(n).getTrimmed().isEqual(o)?n:null}}_showFakeVisualSelection(){const e=this.editor.model;e.change(t=>{e.markers.has("link-ui")?t.updateMarker("link-ui",{range:e.document.selection.getFirstRange()}):t.addMarker("link-ui",{usingOperation:!1,affectsData:!1,range:e.document.selection.getFirstRange()})})}_hideFakeVisualSelection(){const e=this.editor.model;e.markers.has("link-ui")&&e.change(e=>{e.removeMarker("link-ui")})}}function dg(e){return e.getAncestors().find(e=>{return(t=e).is("attributeElement")&&!!t.getCustomProperty("link");var t})}function hg(e,t){let o=e.start;return{text:Array.from(e.getItems()).reduce((e,n)=>n.is("$text")||n.is("$textProxy")?e+n.data:(o=t.createPositionAfter(n),""),""),range:t.createRange(o,e.end)}}class ug{constructor(e,t){this.model=e,this.testCallback=t,this.hasMatch=!1,this.set("isEnabled",!0),this.on("change:isEnabled",()=>{this.isEnabled?this._startListening():(this.stopListening(e.document.selection),this.stopListening(e.document))}),this._startListening()}_startListening(){const e=this.model.document;this.listenTo(e.selection,"change:range",(t,{directChange:o})=>{o&&(e.selection.isCollapsed?this._evaluateTextBeforeSelection("selection"):this.hasMatch&&(this.fire("unmatched"),this.hasMatch=!1))}),this.listenTo(e,"change:data",(e,t)=>{"transparent"!=t.type&&this._evaluateTextBeforeSelection("data",{batch:t})})}_evaluateTextBeforeSelection(e,t={}){const o=this.model,n=o.document.selection,i=o.createRange(o.createPositionAt(n.focus.parent,0),n.focus),{text:r,range:s}=hg(i,o),a=this.testCallback(r);if(!a&&this.hasMatch&&this.fire("unmatched"),this.hasMatch=!!a,a){const o=Object.assign(t,{text:r,range:s});"object"==typeof a&&Object.assign(o,a),this.fire("matched:"+e,o)}}}Co(ug,qn);const mg=new RegExp("(^|\\s)(((?:(?:(?:https?|ftp):)?\\/\\/)(?:\\S+(?::\\S*)?@)?(?:(?![-_])(?:[-\\w\\u00a1-\\uffff]{0,63}[^-_]\\.)+(?:[a-z\\u00a1-\\uffff]{2,}))(?::\\d{2,5})?(?:[/?#]\\S*)?)|((www.|(\\S+@))((?![-_])(?:[-\\w\\u00a1-\\uffff]{0,63}[^-_]\\.))+(?:[a-z\\u00a1-\\uffff]{2,})))$","i"),gg=/^[\S]+@((?![-_])(?:[-\w\u00a1-\uffff]{0,63}[^-_]\.))+(?:[a-z\u00a1-\uffff]{2,})$/i;function fg(e){const t=mg.exec(e);return t?t[2]:null}class pg extends Vd{constructor(e,t){super(e),this.type=t}refresh(){this.value=this._getValue(),this.isEnabled=this._checkEnabled()}execute(){const e=this.editor.model,t=e.document,o=Array.from(t.selection.getSelectedBlocks()).filter(t=>wg(t,e.schema)),n=!0===this.value;e.change(e=>{if(n){let t=o[o.length-1].nextSibling,n=Number.POSITIVE_INFINITY,i=[];for(;t&&"listItem"==t.name&&0!==t.getAttribute("listIndent");){const e=t.getAttribute("listIndent");e=o;)r>i.getAttribute("listIndent")&&(r=i.getAttribute("listIndent")),i.getAttribute("listIndent")==r&&e[t?"unshift":"push"](i),i=i[t?"previousSibling":"nextSibling"]}}function wg(e,t){return t.checkChild(e.parent,"listItem")&&!t.isObject(e)}class kg extends Vd{constructor(e,t){super(e),this._indentBy="forward"==t?1:-1}refresh(){this.isEnabled=this._checkEnabled()}execute(){const e=this.editor.model,t=e.document;let o=Array.from(t.selection.getSelectedBlocks());e.change(e=>{const t=o[o.length-1];let n=t.nextSibling;for(;n&&"listItem"==n.name&&n.getAttribute("listIndent")>t.getAttribute("listIndent");)o.push(n),n=n.nextSibling;this._indentBy<0&&(o=o.reverse());for(const t of o){const o=t.getAttribute("listIndent")+this._indentBy;o<0?e.rename(t,"paragraph"):e.setAttribute("listIndent",o,t)}this.fire("_executeCleanup",o)})}_checkEnabled(){const e=Pd(this.editor.model.document.selection.getSelectedBlocks());if(!e||!e.is("element","listItem"))return!1;if(this._indentBy>0){const t=e.getAttribute("listIndent"),o=e.getAttribute("listType");let n=e.previousSibling;for(;n&&n.is("element","listItem")&&n.getAttribute("listIndent")>=t;){if(n.getAttribute("listIndent")==t)return n.getAttribute("listType")==o;n=n.previousSibling}return!1}return!0}}function _g(e,t){const o=t.mapper,n=t.writer,i="numbered"==e.getAttribute("listType")?"ol":"ul",r=function(e){const t=e.createContainerElement("li");return t.getFillerOffset=Pg,t}(n),s=n.createContainerElement(i,null);return n.insert(n.createPositionAt(s,0),r),o.bindElements(e,r),r}function vg(e,t,o,n){const i=t.parent,r=o.mapper,s=o.writer;let a=r.toViewPosition(n.createPositionBefore(e));const l=Cg(e.previousSibling,{sameIndent:!0,smallerIndent:!0,listIndent:e.getAttribute("listIndent")}),c=e.previousSibling;if(l&&l.getAttribute("listIndent")==e.getAttribute("listIndent")){const e=r.toViewElement(l);a=s.breakContainer(s.createPositionAfter(e))}else if(c&&"listItem"==c.name){a=r.toViewPosition(n.createPositionAt(c,"end"));const e=r.findMappedViewAncestor(a),t=Tg(e);a=t?s.createPositionBefore(t):s.createPositionAt(e,"end")}else a=r.toViewPosition(n.createPositionBefore(e));if(a=xg(a),s.insert(a,i),c&&"listItem"==c.name){const e=r.toViewElement(c),o=s.createRange(s.createPositionAt(e,0),a).getWalker({ignoreElementEnd:!0});for(const e of o)if(e.item.is("element","li")){const n=s.breakContainer(s.createPositionBefore(e.item)),i=e.item.parent,r=s.createPositionAt(t,"end");yg(s,r.nodeBefore,r.nodeAfter),s.move(s.createRangeOn(i),r),o.position=n}}else{const o=i.nextSibling;if(o&&(o.is("element","ul")||o.is("element","ol"))){let n=null;for(const t of o.getChildren()){const o=r.toModelElement(t);if(!(o&&o.getAttribute("listIndent")>e.getAttribute("listIndent")))break;n=t}n&&(s.breakContainer(s.createPositionAfter(n)),s.move(s.createRangeOn(n.parent),s.createPositionAt(t,"end")))}}yg(s,i,i.nextSibling),yg(s,i.previousSibling,i)}function yg(e,t,o){return!t||!o||"ul"!=t.name&&"ol"!=t.name||t.name!=o.name||t.getAttribute("class")!==o.getAttribute("class")?null:e.mergeContainers(e.createPositionAfter(t))}function xg(e){return e.getLastMatchingPosition(e=>e.item.is("uiElement"))}function Cg(e,t){const o=!!t.sameIndent,n=!!t.smallerIndent,i=t.listIndent;let r=e;for(;r&&"listItem"==r.name;){const e=r.getAttribute("listIndent");if(o&&i==e||n&&i>e)return r;r=r.previousSibling}return null}function Ag(e,t,o,n){e.ui.componentFactory.add(t,i=>{const r=e.commands.get(t),s=new Cc(i);return s.set({label:o,icon:n,tooltip:!0,isToggleable:!0}),s.bind("isOn","isEnabled").to(r,"value","isEnabled"),s.on("execute",()=>{e.execute(t),e.editing.view.focus()}),s})}function Tg(e){for(const t of e.getChildren())if("ul"==t.name||"ol"==t.name)return t;return null}function Pg(){const e=!this.isEmpty&&("ul"==this.getChild(0).name||"ol"==this.getChild(0).name);return this.isEmpty||e?0:Fn.call(this)}function Sg(e){return(t,o,n)=>{const i=n.consumable;if(!i.test(o.item,"insert")||!i.test(o.item,"attribute:listType")||!i.test(o.item,"attribute:listIndent"))return;i.consume(o.item,"insert"),i.consume(o.item,"attribute:listType"),i.consume(o.item,"attribute:listIndent");const r=o.item;vg(r,_g(r,n),n,e)}}function Eg(e,t,o){if(!o.consumable.consume(t.item,"attribute:listType"))return;const n=o.mapper.toViewElement(t.item),i=o.writer;i.breakContainer(i.createPositionBefore(n)),i.breakContainer(i.createPositionAfter(n));const r=n.parent,s="numbered"==t.attributeNewValue?"ol":"ul";i.rename(s,r)}function Rg(e,t,o){const n=o.mapper.toViewElement(t.item).parent,i=o.writer;yg(i,n,n.nextSibling),yg(i,n.previousSibling,n);for(const e of t.item.getChildren())o.consumable.consume(e,"insert")}function Ig(e,t,o){if("listItem"!=t.item.name){let e=o.mapper.toViewPosition(t.range.start);const n=o.writer,i=[];for(;("ul"==e.parent.name||"ol"==e.parent.name)&&(e=n.breakContainer(e),"li"==e.parent.name);){const t=e,o=n.createPositionAt(e.parent,"end");if(!t.isEqual(o)){const e=n.remove(n.createRange(t,o));i.push(e)}e=n.createPositionAfter(e.parent)}if(i.length>0){for(let t=0;t0){const t=yg(n,o,o.nextSibling);t&&t.parent==o&&e.offset--}}yg(n,e.nodeBefore,e.nodeAfter)}}}function Vg(e,t,o){const n=o.mapper.toViewPosition(t.position),i=n.nodeBefore,r=n.nodeAfter;yg(o.writer,i,r)}function Og(e,t,o){if(o.consumable.consume(t.viewItem,{name:!0})){const e=o.writer,n=e.createElement("listItem"),i=function(e){let t=0,o=e.parent;for(;o;){if(o.is("element","li"))t++;else{const e=o.previousSibling;e&&e.is("element","li")&&t++}o=o.parent}return t}(t.viewItem);e.setAttribute("listIndent",i,n);const r=t.viewItem.parent&&"ol"==t.viewItem.parent.name?"numbered":"bulleted";if(e.setAttribute("listType",r,n),!o.safeInsert(n,t.modelCursor))return;const s=function(e,t,o){const{writer:n,schema:i}=o;let r=n.createPositionAfter(e);for(const s of t)if("ul"==s.name||"ol"==s.name)r=o.convertItem(s,r).modelCursor;else{const t=o.convertItem(s,n.createPositionAt(e,"end")),a=t.modelRange.start.nodeAfter;a&&a.is("element")&&!i.checkChild(e,a.name)&&(e=t.modelCursor.parent.is("element","listItem")?t.modelCursor.parent:Fg(t.modelCursor),r=n.createPositionAfter(e))}return r}(n,t.viewItem.getChildren(),o);t.modelRange=e.createRange(t.modelCursor,s),o.updateConversionResult(n,t)}}function Mg(e,t,o){if(o.consumable.test(t.viewItem,{name:!0})){const e=Array.from(t.viewItem.getChildren());for(const t of e){!(t.is("element","li")||Lg(t))&&t._remove()}}}function Ng(e,t,o){if(o.consumable.test(t.viewItem,{name:!0})){if(0===t.viewItem.childCount)return;const e=[...t.viewItem.getChildren()];let o=!1,n=!0;for(const t of e)o&&!Lg(t)&&t._remove(),t.is("$text")?(n&&(t._data=t.data.replace(/^\s+/,"")),t.nextSibling&&!Lg(t.nextSibling)||(t._data=t.data.replace(/\s+$/,""))):Lg(t)&&(o=!0),n=!1}}function zg(e){return(t,o)=>{if(o.isPhantom)return;const n=o.modelPosition.nodeBefore;if(n&&n.is("element","listItem")){const t=o.mapper.toViewElement(n),i=t.getAncestors().find(Lg),r=e.createPositionAt(t,0).getWalker();for(const e of r){if("elementStart"==e.type&&e.item.is("element","li")){o.viewPosition=e.previousPosition;break}if("elementEnd"==e.type&&e.item==i){o.viewPosition=e.nextPosition;break}}}}}function Bg(e,[t,o]){let n,i=t.is("documentFragment")?t.getChild(0):t;if(n=o?this.createSelection(o):this.document.selection,i&&i.is("element","listItem")){const e=n.getFirstPosition();let t=null;if(e.parent.is("element","listItem")?t=e.parent:e.nodeBefore&&e.nodeBefore.is("element","listItem")&&(t=e.nodeBefore),t){const e=t.getAttribute("listIndent");if(e>0)for(;i&&i.is("element","listItem");)i._setAttribute("listIndent",i.getAttribute("listIndent")+e),i=i.nextSibling}}}function Fg(e){const t=new xs({startPosition:e});let o;do{o=t.next()}while(!o.value.item.is("element","listItem"));return o.value.item}function Dg(e,t,o,n,i,r){const s=Cg(t.nodeBefore,{sameIndent:!0,smallerIndent:!0,listIndent:e,foo:"b"}),a=i.mapper,l=i.writer,c=s?s.getAttribute("listIndent"):null;let d;if(s)if(c==e){const e=a.toViewElement(s).parent;d=l.createPositionAfter(e)}else{const e=r.createPositionAt(s,"end");d=a.toViewPosition(e)}else d=o;d=xg(d);for(const e of[...n.getChildren()])Lg(e)&&(d=l.move(l.createRangeOn(e),d).end,yg(l,e,e.nextSibling),yg(l,e.previousSibling,e))}function Lg(e){return e.is("element","ol")||e.is("element","ul")}class Hg extends jl{static get pluginName(){return"ListEditing"}static get requires(){return[mh]}init(){const e=this.editor;e.model.schema.register("listItem",{inheritAllFrom:"$block",allowAttributes:["listType","listIndent"]});const t=e.data,o=e.editing;var n;e.model.document.registerPostFixer(t=>function(e,t){const o=e.document.differ.getChanges(),n=new Map;let i=!1;for(const n of o)if("insert"==n.type&&"listItem"==n.name)r(n.position);else if("insert"==n.type&&"listItem"!=n.name){if("$text"!=n.name){const o=n.position.nodeAfter;o.hasAttribute("listIndent")&&(t.removeAttribute("listIndent",o),i=!0),o.hasAttribute("listType")&&(t.removeAttribute("listType",o),i=!0),o.hasAttribute("listStyle")&&(t.removeAttribute("listStyle",o),i=!0);for(const t of Array.from(e.createRangeIn(o)).filter(e=>e.item.is("element","listItem")))r(t.previousPosition)}r(n.position.getShiftedBy(n.length))}else"remove"==n.type&&"listItem"==n.name?r(n.position):("attribute"==n.type&&"listIndent"==n.attributeKey||"attribute"==n.type&&"listType"==n.attributeKey)&&r(n.range.start);for(const e of n.values())s(e),a(e);return i;function r(e){const t=e.nodeBefore;if(t&&t.is("element","listItem")){let e=t;if(n.has(e))return;for(let t=e.previousSibling;t&&t.is("element","listItem");t=e.previousSibling)if(e=t,n.has(e))return;n.set(t,e)}else{const t=e.nodeAfter;t&&t.is("element","listItem")&&n.set(t,t)}}function s(e){let o=0,n=null;for(;e&&e.is("element","listItem");){const r=e.getAttribute("listIndent");if(r>o){let s;null===n?(n=r-o,s=o):(n>r&&(n=r),s=r-n),t.setAttribute("listIndent",s,e),i=!0}else n=null,o=e.getAttribute("listIndent")+1;e=e.nextSibling}}function a(e){let o=[],n=null;for(;e&&e.is("element","listItem");){const r=e.getAttribute("listIndent");if(n&&n.getAttribute("listIndent")>r&&(o=o.slice(0,r+1)),0!=r)if(o[r]){const n=o[r];e.getAttribute("listType")!=n&&(t.setAttribute("listType",n,e),i=!0)}else o[r]=e.getAttribute("listType");n=e,e=e.nextSibling}}}(e.model,t)),o.mapper.registerViewToModelLength("li",jg),t.mapper.registerViewToModelLength("li",jg),o.mapper.on("modelToViewPosition",zg(o.view)),o.mapper.on("viewToModelPosition",(n=e.model,(e,t)=>{const o=t.viewPosition,i=o.parent,r=t.mapper;if("ul"==i.name||"ol"==i.name){if(o.isAtEnd){const e=r.toModelElement(o.nodeBefore),i=r.getModelLength(o.nodeBefore);t.modelPosition=n.createPositionBefore(e).getShiftedBy(i)}else{const e=r.toModelElement(o.nodeAfter);t.modelPosition=n.createPositionBefore(e)}e.stop()}else if("li"==i.name&&o.nodeBefore&&("ul"==o.nodeBefore.name||"ol"==o.nodeBefore.name)){const s=r.toModelElement(i);let a=1,l=o.nodeBefore;for(;l&&Lg(l);)a+=r.getModelLength(l),l=l.previousSibling;t.modelPosition=n.createPositionBefore(s).getShiftedBy(a),e.stop()}})),t.mapper.on("modelToViewPosition",zg(o.view)),e.conversion.for("editingDowncast").add(t=>{t.on("insert",Ig,{priority:"high"}),t.on("insert:listItem",Sg(e.model)),t.on("attribute:listType:listItem",Eg,{priority:"high"}),t.on("attribute:listType:listItem",Rg,{priority:"low"}),t.on("attribute:listIndent:listItem",function(e){return(t,o,n)=>{if(!n.consumable.consume(o.item,"attribute:listIndent"))return;const i=n.mapper.toViewElement(o.item),r=n.writer;r.breakContainer(r.createPositionBefore(i)),r.breakContainer(r.createPositionAfter(i));const s=i.parent,a=s.previousSibling,l=r.createRangeOn(s);r.remove(l),a&&a.nextSibling&&yg(r,a,a.nextSibling),Dg(o.attributeOldValue+1,o.range.start,l.start,i,n,e),vg(o.item,i,n,e);for(const e of o.item.getChildren())n.consumable.consume(e,"insert")}}(e.model)),t.on("remove:listItem",function(e){return(t,o,n)=>{const i=n.mapper.toViewPosition(o.position).getLastMatchingPosition(e=>!e.item.is("element","li")).nodeAfter,r=n.writer;r.breakContainer(r.createPositionBefore(i)),r.breakContainer(r.createPositionAfter(i));const s=i.parent,a=s.previousSibling,l=r.createRangeOn(s),c=r.remove(l);a&&a.nextSibling&&yg(r,a,a.nextSibling);Dg(n.mapper.toModelElement(i).getAttribute("listIndent")+1,o.position,l.start,i,n,e);for(const e of r.createRangeIn(c).getItems())n.mapper.unbindViewElement(e);t.stop()}}(e.model)),t.on("remove",Vg,{priority:"low"})}),e.conversion.for("dataDowncast").add(t=>{t.on("insert",Ig,{priority:"high"}),t.on("insert:listItem",Sg(e.model))}),e.conversion.for("upcast").add(e=>{e.on("element:ul",Mg,{priority:"high"}),e.on("element:ol",Mg,{priority:"high"}),e.on("element:li",Ng,{priority:"high"}),e.on("element:li",Og)}),e.model.on("insertContent",Bg,{priority:"high"}),e.commands.add("numberedList",new pg(e,"numbered")),e.commands.add("bulletedList",new pg(e,"bulleted")),e.commands.add("indentList",new kg(e,"forward")),e.commands.add("outdentList",new kg(e,"backward"));const i=o.view.document;this.listenTo(i,"enter",(e,t)=>{const o=this.editor.model.document,n=o.selection.getLastPosition().parent;o.selection.isCollapsed&&"listItem"==n.name&&n.isEmpty&&(this.editor.execute("outdentList"),t.preventDefault(),e.stop())}),this.listenTo(i,"delete",(e,t)=>{if("backward"!==t.direction)return;const o=this.editor.model.document.selection;if(!o.isCollapsed)return;const n=o.getFirstPosition();if(!n.isAtStart)return;const i=n.parent;if("listItem"!==i.name)return;i.previousSibling&&"listItem"===i.previousSibling.name||(this.editor.execute("outdentList"),t.preventDefault(),e.stop())},{priority:"high"});const r=e=>(t,o)=>{this.editor.commands.get(e).isEnabled&&(this.editor.execute(e),o())};e.keystrokes.set("Tab",r("indentList")),e.keystrokes.set("Shift+Tab",r("outdentList"))}afterInit(){const e=this.editor.commands,t=e.get("indent"),o=e.get("outdent");t&&t.registerChildCommand(e.get("indentList")),o&&o.registerChildCommand(e.get("outdentList"))}}function jg(e){let t=1;for(const o of e.getChildren())if("ul"==o.name||"ol"==o.name)for(const e of o.getChildren())t+=jg(e);return t}class Wg extends jl{init(){const e=this.editor.t;Ag(this.editor,"numberedList",e("Numbered List"),' '),Ag(this.editor,"bulletedList",e("Bulleted List"),' ')}}class qg extends Vd{constructor(e){super(e),this._selectedElements=[],this.on("execute",()=>{this.refresh()},{priority:"highest"})}refresh(){this._selectedElements=this._getSelectedItems(),this.value=this._selectedElements.every(e=>!!e.getAttribute("todoListChecked")),this.isEnabled=!!this._selectedElements.length}_getSelectedItems(){const e=this.editor.model,t=e.schema,o=e.document.selection.getFirstRange(),n=o.start.parent,i=[];t.checkAttribute(n,"todoListChecked")&&i.push(n);for(const e of o.getItems())t.checkAttribute(e,"todoListChecked")&&!i.includes(e)&&i.push(e);return i}execute(e={}){this.editor.model.change(t=>{for(const o of this._selectedElements){(void 0===e.forceValue?!this.value:e.forceValue)?t.setAttribute("todoListChecked",!0,o):t.removeAttribute("todoListChecked",o)}})}}function $g(e,t,o){const n=t.modelCursor,i=n.parent,r=t.viewItem;if("checkbox"!=r.getAttribute("type")||"listItem"!=i.name||!n.isAtStart)return;if(!o.consumable.consume(r,{name:!0}))return;const s=o.writer;s.setAttribute("listType","todo",i),t.viewItem.hasAttribute("checked")&&s.setAttribute("todoListChecked",!0,i),t.modelRange=s.createRange(n)}function Ug(e){return(t,o)=>{const n=o.modelPosition,i=n.parent;if(!i.is("element","listItem")||"todo"!=i.getAttribute("listType"))return;const r=Kg(o.mapper.toViewElement(i),e);r&&(o.viewPosition=o.mapper.findPositionIn(r,n.offset))}}function Gg(e,t,o,n){return t.createUIElement("label",{class:"todo-list__label",contenteditable:!1},(function(t){const i=dd(document,"input",{type:"checkbox"});o&&i.setAttribute("checked","checked"),i.addEventListener("change",()=>n(e));const r=this.toDomElement(t);return r.appendChild(i),r}))}function Kg(e,t){const o=t.createRangeIn(e);for(const e of o)if(e.item.is("containerElement","span")&&e.item.hasClass("todo-list__label__description"))return e.item}class Jg extends jl{static get pluginName(){return"TodoListEditing"}static get requires(){return[Hg]}init(){const e=this.editor,{editing:t,data:o,model:n}=e;var i,r;n.schema.extend("listItem",{allowAttributes:["todoListChecked"]}),n.schema.addAttributeCheck((e,t)=>{const o=e.last;if("todoListChecked"==t&&"listItem"==o.name&&"todo"!=o.getAttribute("listType"))return!1}),e.commands.add("todoList",new pg(e,"todo")),e.commands.add("todoListCheck",new qg(e)),o.downcastDispatcher.on("insert:listItem",function(e){return(t,o,n)=>{const i=n.consumable;if(!i.test(o.item,"insert")||!i.test(o.item,"attribute:listType")||!i.test(o.item,"attribute:listIndent"))return;if("todo"!=o.item.getAttribute("listType"))return;const r=o.item;i.consume(r,"insert"),i.consume(r,"attribute:listType"),i.consume(r,"attribute:listIndent"),i.consume(r,"attribute:todoListChecked");const s=n.writer,a=_g(r,n);s.addClass("todo-list",a.parent);const l=s.createContainerElement("label",{class:"todo-list__label"}),c=s.createEmptyElement("input",{type:"checkbox",disabled:"disabled"}),d=s.createContainerElement("span",{class:"todo-list__label__description"});r.getAttribute("todoListChecked")&&s.setAttribute("checked","checked",c),s.insert(s.createPositionAt(a,0),l),s.insert(s.createPositionAt(l,0),c),s.insert(s.createPositionAfter(c),d),vg(r,a,n,e)}}(n),{priority:"high"}),o.upcastDispatcher.on("element:input",$g,{priority:"high"}),t.downcastDispatcher.on("insert:listItem",function(e,t){return(o,n,i)=>{const r=i.consumable;if(!r.test(n.item,"insert")||!r.test(n.item,"attribute:listType")||!r.test(n.item,"attribute:listIndent"))return;if("todo"!=n.item.getAttribute("listType"))return;const s=n.item;r.consume(s,"insert"),r.consume(s,"attribute:listType"),r.consume(s,"attribute:listIndent"),r.consume(s,"attribute:todoListChecked");const a=i.writer,l=_g(s,i),c=!!s.getAttribute("todoListChecked"),d=Gg(s,a,c,t),h=a.createContainerElement("span",{class:"todo-list__label__description"});a.addClass("todo-list",l.parent),a.insert(a.createPositionAt(l,0),d),a.insert(a.createPositionAfter(d),h),vg(s,l,i,e)}}(n,e=>this._handleCheckmarkChange(e)),{priority:"high"}),t.downcastDispatcher.on("attribute:listType:listItem",(i=e=>this._handleCheckmarkChange(e),r=t.view,(e,t,o)=>{const n=o.mapper.toViewElement(t.item),s=o.writer,a=function(e,t){const o=t.createRangeIn(e);for(const e of o)if(e.item.is("uiElement","label"))return e.item}(n,r);if("todo"==t.attributeNewValue){const e=!!t.item.getAttribute("todoListChecked"),o=Gg(t.item,s,e,i),r=s.createContainerElement("span",{class:"todo-list__label__description"}),a=s.createRangeIn(n),l=Tg(n),c=xg(a.start),d=l?s.createPositionBefore(l):a.end,h=s.createRange(c,d);s.addClass("todo-list",n.parent),s.move(h,s.createPositionAt(r,0)),s.insert(s.createPositionAt(n,0),o),s.insert(s.createPositionAfter(o),r)}else if("todo"==t.attributeOldValue){const e=Kg(n,r);s.removeClass("todo-list",n.parent),s.remove(a),s.move(s.createRangeIn(e),s.createPositionBefore(e)),s.remove(e)}})),t.downcastDispatcher.on("attribute:todoListChecked:listItem",function(e){return(t,o,n)=>{if("todo"!=o.item.getAttribute("listType"))return;if(!n.consumable.consume(o.item,"attribute:todoListChecked"))return;const{mapper:i,writer:r}=n,s=!!o.item.getAttribute("todoListChecked"),a=i.toViewElement(o.item).getChild(0),l=Gg(o.item,r,s,e);r.insert(r.createPositionAfter(a),l),r.remove(a)}}(e=>this._handleCheckmarkChange(e))),t.mapper.on("modelToViewPosition",Ug(t.view)),o.mapper.on("modelToViewPosition",Ug(t.view)),this.listenTo(t.view.document,"keydown",function(e,t){return(o,n)=>{if("left"!=vi(n.keyCode,t.contentLanguageDirection))return;const i=e.schema,r=e.document.selection;if(!r.isCollapsed)return;const s=r.getFirstPosition(),a=s.parent;if("listItem"===a.name&&"todo"==a.getAttribute("listType")&&s.isAtStart){const t=i.getNearestSelectionRange(e.createPositionBefore(a),"backward");t&&e.change(e=>e.setSelection(t)),n.preventDefault(),n.stopPropagation(),o.stop()}}}(n,e.locale)),e.keystrokes.set("Ctrl+space",()=>e.execute("todoListCheck"));const s=new Set;this.listenTo(n,"applyOperation",(e,t)=>{const o=t[0];if("rename"==o.type&&"listItem"==o.oldName){const e=o.position.nodeAfter;e.hasAttribute("todoListChecked")&&s.add(e)}else if("changeAttribute"==o.type&&"listType"==o.key&&"todo"===o.oldValue)for(const e of o.range.getItems())e.hasAttribute("todoListChecked")&&"todo"!==e.getAttribute("listType")&&s.add(e)}),n.document.registerPostFixer(e=>{let t=!1;for(const o of s)e.removeAttribute("todoListChecked",o),t=!0;return s.clear(),t})}_handleCheckmarkChange(e){const t=this.editor,o=t.model,n=Array.from(o.document.selection.getRanges());o.change(o=>{o.setSelection(e,"end"),t.execute("todoListCheck"),o.setSelection(n)})}}class Yg extends jl{init(){const e=this.editor.t;Ag(this.editor,"todoList",e("To-do List"),' ')}}o(90);function Qg(e,t){if(!e.childCount)return;const o=new nm(e.document),n=function(e,t){const o=t.createRangeIn(e),n=new Fo({name:/^p|h\d+$/,styles:{"mso-list":/.*/}}),i=[];for(const e of o)if("elementStart"===e.type&&n.match(e.item)){const t=Zg(e.item);i.push({element:e.item,id:t.id,order:t.order,indent:t.indent})}return i}(e,o);if(!n.length)return;let i=null,r=1;n.forEach((e,s)=>{const a=function(e,t){if(!e)return!0;if(e.id!==t.id)return!0;const o=t.element.previousSibling;if(!o)return!0;return n=o,!(n.is("element","ol")||n.is("element","ul"));var n}(n[s-1],e),l=a?null:n[s-1],c=(h=e,(d=l)?h.indent-d.indent:h.indent-1);var d,h;if(a&&(i=null,r=1),!i||0!==c){const n=function(e,t){const o=new RegExp(`@list l${e.id}:level${e.indent}\\s*({[^}]*)`,"gi"),n=/mso-level-number-format:([^;]*);/gi,i=o.exec(t);let r="decimal";if(i&&i[1]){const e=n.exec(i[1]);e&&e[1]&&(r=e[1].trim())}return{type:"bullet"!==r&&"image"!==r?"ol":"ul",style:r}}(e,t);if(i){if(e.indent>r){const e=i.getChild(i.childCount-1),t=e.getChild(e.childCount-1);i=Xg(n,t,o),r+=1}else if(e.indent(\s+)<\/span>/g,(e,t)=>1===t.length?" ":Array(t.length+1).join(" ").substr(0,t.length))}function nf(e,t){const o=new DOMParser,n=function(e){return of(of(e)).replace(/([\s]*?)[\r\n]+(\s*<\/span>)/g,"$1$2").replace(/<\/span>/g,"").replace(/ <\//g," ").replace(/ <\/o:p>/g," ").replace(/( |\u00A0)<\/o:p>/g,"").replace(/>(\s*[\r\n]\s*)<")}(function(e){const t=e.match(/<\/body>(.*?)(<\/html>|$)/);t&&t[1]&&(e=e.slice(0,t.index)+e.slice(t.index).replace(t[1],""));return e}(e=e.replace(/ abc
\n\t\t\t//\n\t\t\tif ( isAttribute && this._wrapAttributeElement( wrapElement, child ) ) {\n\t\t\t\twrapPositions.push( new Position( parent, i ) );\n\t\t\t}\n\t\t\t//\n\t\t\t// Wrap the child if it is not an attribute element or if it is an attribute element that should be inside\n\t\t\t// `wrapElement` (due to priority).\n\t\t\t//\n\t\t\t// abc
--> abc
\n\t\t\t// abc
--> abc
\n\t\t\telse if ( isText || isEmpty || isUI || isRaw || ( isAttribute && shouldABeOutsideB( wrapElement, child ) ) ) {\n\t\t\t\t// Clone attribute.\n\t\t\t\tconst newAttribute = wrapElement._clone();\n\n\t\t\t\t// Wrap current node with new attribute.\n\t\t\t\tchild._remove();\n\t\t\t\tnewAttribute._appendChild( child );\n\n\t\t\t\tparent._insertChild( i, newAttribute );\n\t\t\t\tthis._addToClonedElementsGroup( newAttribute );\n\n\t\t\t\twrapPositions.push( new Position( parent, i ) );\n\t\t\t}\n\t\t\t//\n\t\t\t// If other nested attribute is found and it wasn't wrapped (see above), continue wrapping inside it.\n\t\t\t//\n\t\t\t// abc
--> abc
\n\t\t\t//\n\t\t\telse if ( isAttribute ) {\n\t\t\t\tthis._wrapChildren( child, 0, child.childCount, wrapElement );\n\t\t\t}\n\n\t\t\ti++;\n\t\t}\n\n\t\t// Merge at each wrap.\n\t\tlet offsetChange = 0;\n\n\t\tfor ( const position of wrapPositions ) {\n\t\t\tposition.offset -= offsetChange;\n\n\t\t\t// Do not merge with elements outside selected children.\n\t\t\tif ( position.offset == startOffset ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst newPosition = this.mergeAttributes( position );\n\n\t\t\t// If nodes were merged - other merge offsets will change.\n\t\t\tif ( !newPosition.isEqual( position ) ) {\n\t\t\t\toffsetChange++;\n\t\t\t\tendOffset--;\n\t\t\t}\n\t\t}\n\n\t\treturn Range._createFromParentsAndOffsets( parent, startOffset, parent, endOffset );\n\t}\n\n\t/**\n\t * Unwraps children from provided `unwrapElement`. Only children contained in `parent` element between\n\t * `startOffset` and `endOffset` will be unwrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} parent\n\t * @param {Number} startOffset\n\t * @param {Number} endOffset\n\t * @param {module:engine/view/element~Element} unwrapElement\n\t */\n\t_unwrapChildren( parent, startOffset, endOffset, unwrapElement ) {\n\t\tlet i = startOffset;\n\t\tconst unwrapPositions = [];\n\n\t\t// Iterate over each element between provided offsets inside parent.\n\t\t// We don't use tree walker or range iterator because we will be removing and merging potentially multiple nodes,\n\t\t// so it could get messy. It is safer to it manually in this case.\n\t\twhile ( i < endOffset ) {\n\t\t\tconst child = parent.getChild( i );\n\n\t\t\t// Skip all text nodes. There should be no container element's here either.\n\t\t\tif ( !child.is( 'attributeElement' ) ) {\n\t\t\t\ti++;\n\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t//\n\t\t\t// (In all examples, assume that `unwrapElement` is `` element.)\n\t\t\t//\n\t\t\t// If the child is similar to the given attribute element, unwrap it - it will be completely removed.\n\t\t\t//\n\t\t\t// abc xyz
--> abcxyz
\n\t\t\t//\n\t\t\tif ( child.isSimilar( unwrapElement ) ) {\n\t\t\t\tconst unwrapped = child.getChildren();\n\t\t\t\tconst count = child.childCount;\n\n\t\t\t\t// Replace wrapper element with its children\n\t\t\t\tchild._remove();\n\t\t\t\tparent._insertChild( i, unwrapped );\n\n\t\t\t\tthis._removeFromClonedElementsGroup( child );\n\n\t\t\t\t// Save start and end position of moved items.\n\t\t\t\tunwrapPositions.push(\n\t\t\t\t\tnew Position( parent, i ),\n\t\t\t\t\tnew Position( parent, i + count )\n\t\t\t\t);\n\n\t\t\t\t// Skip elements that were unwrapped. Assuming there won't be another element to unwrap in child elements.\n\t\t\t\ti += count;\n\t\t\t\tendOffset += count - 1;\n\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t//\n\t\t\t// If the child is not similar but is an attribute element, try partial unwrapping - remove the same attributes/styles/classes.\n\t\t\t// Partial unwrapping will happen only if the elements have the same name.\n\t\t\t//\n\t\t\t// abc xyz
--> abc xyz
\n\t\t\t// abc xyz
--> abc xyz
\n\t\t\t//\n\t\t\tif ( this._unwrapAttributeElement( unwrapElement, child ) ) {\n\t\t\t\tunwrapPositions.push(\n\t\t\t\t\tnew Position( parent, i ),\n\t\t\t\t\tnew Position( parent, i + 1 )\n\t\t\t\t);\n\n\t\t\t\ti++;\n\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t//\n\t\t\t// If other nested attribute is found, look through it's children for elements to unwrap.\n\t\t\t//\n\t\t\t// abc
-->
abc
\n\t\t\t//\n\t\t\tthis._unwrapChildren( child, 0, child.childCount, unwrapElement );\n\n\t\t\ti++;\n\t\t}\n\n\t\t// Merge at each unwrap.\n\t\tlet offsetChange = 0;\n\n\t\tfor ( const position of unwrapPositions ) {\n\t\t\tposition.offset -= offsetChange;\n\n\t\t\t// Do not merge with elements outside selected children.\n\t\t\tif ( position.offset == startOffset || position.offset == endOffset ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst newPosition = this.mergeAttributes( position );\n\n\t\t\t// If nodes were merged - other merge offsets will change.\n\t\t\tif ( !newPosition.isEqual( position ) ) {\n\t\t\t\toffsetChange++;\n\t\t\t\tendOffset--;\n\t\t\t}\n\t\t}\n\n\t\treturn Range._createFromParentsAndOffsets( parent, startOffset, parent, endOffset );\n\t}\n\n\t/**\n\t * Helper function for `view.writer.wrap`. Wraps range with provided attribute element.\n\t * This method will also merge newly added attribute element with its siblings whenever possible.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t * @returns {module:engine/view/range~Range} New range after wrapping, spanning over wrapping attribute element.\n\t */\n\t_wrapRange( range, attribute ) {\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\t\tconst parentContainer = breakStart.parent;\n\n\t\t// Wrap all children with attribute.\n\t\tconst newRange = this._wrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );\n\n\t\t// Merge attributes at the both ends and return a new range.\n\t\tconst start = this.mergeAttributes( newRange.start );\n\n\t\t// If start position was merged - move end position back.\n\t\tif ( !start.isEqual( newRange.start ) ) {\n\t\t\tnewRange.end.offset--;\n\t\t}\n\t\tconst end = this.mergeAttributes( newRange.end );\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Helper function for {@link #wrap}. Wraps position with provided attribute element.\n\t * This method will also merge newly added attribute element with its siblings whenever possible.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} position\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t * @returns {module:engine/view/position~Position} New position after wrapping.\n\t */\n\t_wrapPosition( position, attribute ) {\n\t\t// Return same position when trying to wrap with attribute similar to position parent.\n\t\tif ( attribute.isSimilar( position.parent ) ) {\n\t\t\treturn movePositionToTextNode( position.clone() );\n\t\t}\n\n\t\t// When position is inside text node - break it and place new position between two text nodes.\n\t\tif ( position.parent.is( '$text' ) ) {\n\t\t\tposition = breakTextNode( position );\n\t\t}\n\n\t\t// Create fake element that will represent position, and will not be merged with other attributes.\n\t\tconst fakePosition = this.createAttributeElement();\n\t\tfakePosition._priority = Number.POSITIVE_INFINITY;\n\t\tfakePosition.isSimilar = () => false;\n\n\t\t// Insert fake element in position location.\n\t\tposition.parent._insertChild( position.offset, fakePosition );\n\n\t\t// Range around inserted fake attribute element.\n\t\tconst wrapRange = new Range( position, position.getShiftedBy( 1 ) );\n\n\t\t// Wrap fake element with attribute (it will also merge if possible).\n\t\tthis.wrap( wrapRange, attribute );\n\n\t\t// Remove fake element and place new position there.\n\t\tconst newPosition = new Position( fakePosition.parent, fakePosition.index );\n\t\tfakePosition._remove();\n\n\t\t// If position is placed between text nodes - merge them and return position inside.\n\t\tconst nodeBefore = newPosition.nodeBefore;\n\t\tconst nodeAfter = newPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof Text && nodeAfter instanceof Text ) {\n\t\t\treturn mergeTextNodes( nodeBefore, nodeAfter );\n\t\t}\n\n\t\t// If position is next to text node - move position inside.\n\t\treturn movePositionToTextNode( newPosition );\n\t}\n\n\t/**\n\t * \tWraps one {@link module:engine/view/attributeelement~AttributeElement AttributeElement} into another by\n\t * \tmerging them if possible. When merging is possible - all attributes, styles and classes are moved from wrapper\n\t * \telement to element being wrapped.\n\t *\n\t * \t@private\n\t * \t@param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.\n\t * \t@param {module:engine/view/attributeelement~AttributeElement} toWrap AttributeElement to wrap using wrapper element.\n\t * \t@returns {Boolean} Returns `true` if elements are merged.\n\t */\n\t_wrapAttributeElement( wrapper, toWrap ) {\n\t\tif ( !canBeJoined( wrapper, toWrap ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Can't merge if name or priority differs.\n\t\tif ( wrapper.name !== toWrap.name || wrapper.priority !== toWrap.priority ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes can be merged.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// If some attributes are different we cannot wrap.\n\t\t\tif ( toWrap.hasAttribute( key ) && toWrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles can be merged.\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\tif ( toWrap.hasStyle( key ) && toWrap.getStyle( key ) !== wrapper.getStyle( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Move all attributes/classes/styles from wrapper to wrapped AttributeElement.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// Move only these attributes that are not present - other are similar.\n\t\t\tif ( !toWrap.hasAttribute( key ) ) {\n\t\t\t\tthis.setAttribute( key, wrapper.getAttribute( key ), toWrap );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\tif ( !toWrap.hasStyle( key ) ) {\n\t\t\t\tthis.setStyle( key, wrapper.getStyle( key ), toWrap );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of wrapper.getClassNames() ) {\n\t\t\tif ( !toWrap.hasClass( key ) ) {\n\t\t\t\tthis.addClass( key, toWrap );\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Unwraps {@link module:engine/view/attributeelement~AttributeElement AttributeElement} from another by removing\n\t * corresponding attributes, classes and styles. All attributes, classes and styles from wrapper should be present\n\t * inside element being unwrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.\n\t * @param {module:engine/view/attributeelement~AttributeElement} toUnwrap AttributeElement to unwrap using wrapper element.\n\t * @returns {Boolean} Returns `true` if elements are unwrapped.\n\t **/\n\t_unwrapAttributeElement( wrapper, toUnwrap ) {\n\t\tif ( !canBeJoined( wrapper, toUnwrap ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Can't unwrap if name or priority differs.\n\t\tif ( wrapper.name !== toUnwrap.name || wrapper.priority !== toUnwrap.priority ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper attributes.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// If some attributes are missing or different we cannot unwrap.\n\t\t\tif ( !toUnwrap.hasAttribute( key ) || toUnwrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper classes.\n\t\tif ( !toUnwrap.hasClass( ...wrapper.getClassNames() ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper styles.\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\t// If some styles are missing or different we cannot unwrap.\n\t\t\tif ( !toUnwrap.hasStyle( key ) || toUnwrap.getStyle( key ) !== wrapper.getStyle( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Remove all wrapper's attributes from unwrapped element.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tthis.removeAttribute( key, toUnwrap );\n\t\t}\n\n\t\t// Remove all wrapper's classes from unwrapped element.\n\t\tthis.removeClass( Array.from( wrapper.getClassNames() ), toUnwrap );\n\n\t\t// Remove all wrapper's styles from unwrapped element.\n\t\tthis.removeStyle( Array.from( wrapper.getStyleNames() ), toUnwrap );\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Helper function used by other `DowncastWriter` methods. Breaks attribute elements at the boundaries of given range.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range Range which `start` and `end` positions will be used to break attributes.\n\t * @param {Boolean} [forceSplitText=false] If set to `true`, will break text nodes even if they are directly in container element.\n\t * This behavior will result in incorrect view state, but is needed by other view writing methods which then fixes view state.\n\t * @returns {module:engine/view/range~Range} New range with located at break positions.\n\t */\n\t_breakAttributesRange( range, forceSplitText = false ) {\n\t\tconst rangeStart = range.start;\n\t\tconst rangeEnd = range.end;\n\n\t\tvalidateRangeContainer( range, this.document );\n\n\t\t// Break at the collapsed position. Return new collapsed range.\n\t\tif ( range.isCollapsed ) {\n\t\t\tconst position = this._breakAttributes( range.start, forceSplitText );\n\n\t\t\treturn new Range( position, position );\n\t\t}\n\n\t\tconst breakEnd = this._breakAttributes( rangeEnd, forceSplitText );\n\t\tconst count = breakEnd.parent.childCount;\n\t\tconst breakStart = this._breakAttributes( rangeStart, forceSplitText );\n\n\t\t// Calculate new break end offset.\n\t\tbreakEnd.offset += breakEnd.parent.childCount - count;\n\n\t\treturn new Range( breakStart, breakEnd );\n\t}\n\n\t/**\n\t * Helper function used by other `DowncastWriter` methods. Breaks attribute elements at given position.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-empty-element` when break position\n\t * is placed inside {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-ui-element` when break position\n\t * is placed inside {@link module:engine/view/uielement~UIElement UIElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} position Position where to break attributes.\n\t * @param {Boolean} [forceSplitText=false] If set to `true`, will break text nodes even if they are directly in container element.\n\t * This behavior will result in incorrect view state, but is needed by other view writing methods which then fixes view state.\n\t * @returns {module:engine/view/position~Position} New position after breaking the attributes.\n\t */\n\t_breakAttributes( position, forceSplitText = false ) {\n\t\tconst positionOffset = position.offset;\n\t\tconst positionParent = position.parent;\n\n\t\t// If position is placed inside EmptyElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'emptyElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break an `EmptyElement` instance.\n\t\t\t *\n\t\t\t * This error is thrown if\n\t\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes `DowncastWriter#breakAttributes()`}\n\t\t\t * was executed in an incorrect position.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-empty-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-empty-element: Cannot break an EmptyElement instance.', this.document );\n\t\t}\n\n\t\t// If position is placed inside UIElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'uiElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break a `UIElement` instance.\n\t\t\t *\n\t\t\t * This error is thrown if\n\t\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes `DowncastWriter#breakAttributes()`}\n\t\t\t * was executed in an incorrect position.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-ui-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-ui-element: Cannot break a UIElement instance.', this.document );\n\t\t}\n\n\t\t// If position is placed inside RawElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'rawElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break a `RawElement` instance.\n\t\t\t *\n\t\t\t * This error is thrown if\n\t\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes `DowncastWriter#breakAttributes()`}\n\t\t\t * was executed in an incorrect position.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-raw-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-raw-element: Cannot break a RawElement instance.', this.document );\n\t\t}\n\n\t\t// There are no attributes to break and text nodes breaking is not forced.\n\t\tif ( !forceSplitText && positionParent.is( '$text' ) && isContainerOrFragment( positionParent.parent ) ) {\n\t\t\treturn position.clone();\n\t\t}\n\n\t\t// Position's parent is container, so no attributes to break.\n\t\tif ( isContainerOrFragment( positionParent ) ) {\n\t\t\treturn position.clone();\n\t\t}\n\n\t\t// Break text and start again in new position.\n\t\tif ( positionParent.is( '$text' ) ) {\n\t\t\treturn this._breakAttributes( breakTextNode( position ), forceSplitText );\n\t\t}\n\n\t\tconst length = positionParent.childCount;\n\n\t\t//
foobar{}
\n\t\t// foobar []
\n\t\t// foobar []
\n\t\tif ( positionOffset == length ) {\n\t\t\tconst newPosition = new Position( positionParent.parent, positionParent.index + 1 );\n\n\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t} else {\n\t\t\t// foo{}bar
\n\t\t\t// foo[]bar
\n\t\t\t// foo{}bar
\n\t\t\tif ( positionOffset === 0 ) {\n\t\t\t\tconst newPosition = new Position( positionParent.parent, positionParent.index );\n\n\t\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t\t}\n\t\t\t// foob{}ar
\n\t\t\t// foob[]ar
\n\t\t\t// foob []ar
\n\t\t\t// foob []ar
\n\t\t\telse {\n\t\t\t\tconst offsetAfter = positionParent.index + 1;\n\n\t\t\t\t// Break element.\n\t\t\t\tconst clonedNode = positionParent._clone();\n\n\t\t\t\t// Insert cloned node to position's parent node.\n\t\t\t\tpositionParent.parent._insertChild( offsetAfter, clonedNode );\n\t\t\t\tthis._addToClonedElementsGroup( clonedNode );\n\n\t\t\t\t// Get nodes to move.\n\t\t\t\tconst count = positionParent.childCount - positionOffset;\n\t\t\t\tconst nodesToMove = positionParent._removeChildren( positionOffset, count );\n\n\t\t\t\t// Move nodes to cloned node.\n\t\t\t\tclonedNode._appendChild( nodesToMove );\n\n\t\t\t\t// Create new position to work on.\n\t\t\t\tconst newPosition = new Position( positionParent.parent, offsetAfter );\n\n\t\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Stores the information that an {@link module:engine/view/attributeelement~AttributeElement attribute element} was\n\t * added to the tree. Saves the reference to the group in the given element and updates the group, so other elements\n\t * from the group now keep a reference to the given attribute element.\n\t *\n\t * The clones group can be obtained using {@link module:engine/view/attributeelement~AttributeElement#getElementsWithSameId}.\n\t *\n\t * Does nothing if added element has no {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} element Attribute element to save.\n\t */\n\t_addToClonedElementsGroup( element ) {\n\t\t// Add only if the element is in document tree.\n\t\tif ( !element.root.is( 'rootElement' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Traverse the element's children recursively to find other attribute elements that also might got inserted.\n\t\t// The loop is at the beginning so we can make fast returns later in the code.\n\t\tif ( element.is( 'element' ) ) {\n\t\t\tfor ( const child of element.getChildren() ) {\n\t\t\t\tthis._addToClonedElementsGroup( child );\n\t\t\t}\n\t\t}\n\n\t\tconst id = element.id;\n\n\t\tif ( !id ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlet group = this._cloneGroups.get( id );\n\n\t\tif ( !group ) {\n\t\t\tgroup = new Set();\n\t\t\tthis._cloneGroups.set( id, group );\n\t\t}\n\n\t\tgroup.add( element );\n\t\telement._clonesGroup = group;\n\t}\n\n\t/**\n\t * Removes all the information about the given {@link module:engine/view/attributeelement~AttributeElement attribute element}\n\t * from its clones group.\n\t *\n\t * Keep in mind, that the element will still keep a reference to the group (but the group will not keep a reference to it).\n\t * This allows to reference the whole group even if the element was already removed from the tree.\n\t *\n\t * Does nothing if the element has no {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} element Attribute element to remove.\n\t */\n\t_removeFromClonedElementsGroup( element ) {\n\t\t// Traverse the element's children recursively to find other attribute elements that also got removed.\n\t\t// The loop is at the beginning so we can make fast returns later in the code.\n\t\tif ( element.is( 'element' ) ) {\n\t\t\tfor ( const child of element.getChildren() ) {\n\t\t\t\tthis._removeFromClonedElementsGroup( child );\n\t\t\t}\n\t\t}\n\n\t\tconst id = element.id;\n\n\t\tif ( !id ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst group = this._cloneGroups.get( id );\n\n\t\tif ( !group ) {\n\t\t\treturn;\n\t\t}\n\n\t\tgroup.delete( element );\n\t\t// Not removing group from element on purpose!\n\t\t// If other parts of code have reference to this element, they will be able to get references to other elements from the group.\n\t}\n}\n\n// Helper function for `view.writer.wrap`. Checks if given element has any children that are not ui elements.\nfunction _hasNonUiChildren( parent ) {\n\treturn Array.from( parent.getChildren() ).some( child => !child.is( 'uiElement' ) );\n}\n\n/**\n * The `attribute` passed to {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#wrap()`}\n * must be an instance of {@link module:engine/view/attributeelement~AttributeElement `AttributeElement`}.\n *\n * @error view-writer-wrap-invalid-attribute\n */\n\n// Returns first parent container of specified {@link module:engine/view/position~Position Position}.\n// Position's parent node is checked as first, then next parents are checked.\n// Note that {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.\n//\n// @param {module:engine/view/position~Position} position Position used as a start point to locate parent container.\n// @returns {module:engine/view/containerelement~ContainerElement|module:engine/view/documentfragment~DocumentFragment|undefined}\n// Parent container element or `undefined` if container is not found.\nfunction getParentContainer( position ) {\n\tlet parent = position.parent;\n\n\twhile ( !isContainerOrFragment( parent ) ) {\n\t\tif ( !parent ) {\n\t\t\treturn undefined;\n\t\t}\n\t\tparent = parent.parent;\n\t}\n\n\treturn parent;\n}\n\n// Checks if first {@link module:engine/view/attributeelement~AttributeElement AttributeElement} provided to the function\n// can be wrapped otuside second element. It is done by comparing elements'\n// {@link module:engine/view/attributeelement~AttributeElement#priority priorities}, if both have same priority\n// {@link module:engine/view/element~Element#getIdentity identities} are compared.\n//\n// @param {module:engine/view/attributeelement~AttributeElement} a\n// @param {module:engine/view/attributeelement~AttributeElement} b\n// @returns {Boolean}\nfunction shouldABeOutsideB( a, b ) {\n\tif ( a.priority < b.priority ) {\n\t\treturn true;\n\t} else if ( a.priority > b.priority ) {\n\t\treturn false;\n\t}\n\n\t// When priorities are equal and names are different - use identities.\n\treturn a.getIdentity() < b.getIdentity();\n}\n\n// Returns new position that is moved to near text node. Returns same position if there is no text node before of after\n// specified position.\n//\n//\t\tfoo[]
-> foo{}
\n//\t\t[]foo
-> {}foo
\n//\n// @param {module:engine/view/position~Position} position\n// @returns {module:engine/view/position~Position} Position located inside text node or same position if there is no text nodes\n// before or after position location.\nfunction movePositionToTextNode( position ) {\n\tconst nodeBefore = position.nodeBefore;\n\n\tif ( nodeBefore && nodeBefore.is( '$text' ) ) {\n\t\treturn new Position( nodeBefore, nodeBefore.data.length );\n\t}\n\n\tconst nodeAfter = position.nodeAfter;\n\n\tif ( nodeAfter && nodeAfter.is( '$text' ) ) {\n\t\treturn new Position( nodeAfter, 0 );\n\t}\n\n\treturn position;\n}\n\n// Breaks text node into two text nodes when possible.\n//\n//\t\tfoo{}bar
-> foo[]bar
\n//\t\t{}foobar
-> []foobar
\n//\t\tfoobar{}
-> foobar[]
\n//\n// @param {module:engine/view/position~Position} position Position that need to be placed inside text node.\n// @returns {module:engine/view/position~Position} New position after breaking text node.\nfunction breakTextNode( position ) {\n\tif ( position.offset == position.parent.data.length ) {\n\t\treturn new Position( position.parent.parent, position.parent.index + 1 );\n\t}\n\n\tif ( position.offset === 0 ) {\n\t\treturn new Position( position.parent.parent, position.parent.index );\n\t}\n\n\t// Get part of the text that need to be moved.\n\tconst textToMove = position.parent.data.slice( position.offset );\n\n\t// Leave rest of the text in position's parent.\n\tposition.parent._data = position.parent.data.slice( 0, position.offset );\n\n\t// Insert new text node after position's parent text node.\n\tposition.parent.parent._insertChild( position.parent.index + 1, new Text( position.root.document, textToMove ) );\n\n\t// Return new position between two newly created text nodes.\n\treturn new Position( position.parent.parent, position.parent.index + 1 );\n}\n\n// Merges two text nodes into first node. Removes second node and returns merge position.\n//\n// @param {module:engine/view/text~Text} t1 First text node to merge. Data from second text node will be moved at the end of\n// this text node.\n// @param {module:engine/view/text~Text} t2 Second text node to merge. This node will be removed after merging.\n// @returns {module:engine/view/position~Position} Position after merging text nodes.\nfunction mergeTextNodes( t1, t2 ) {\n\t// Merge text data into first text node and remove second one.\n\tconst nodeBeforeLength = t1.data.length;\n\tt1._data += t2.data;\n\tt2._remove();\n\n\treturn new Position( t1, nodeBeforeLength );\n}\n\n// Checks if provided nodes are valid to insert. Checks if each node is an instance of\n// {@link module:engine/view/text~Text Text} or {@link module:engine/view/attributeelement~AttributeElement AttributeElement},\n// {@link module:engine/view/containerelement~ContainerElement ContainerElement},\n// {@link module:engine/view/emptyelement~EmptyElement EmptyElement} or\n// {@link module:engine/view/uielement~UIElement UIElement}.\n//\n// Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert\n// contains instances that are not {@link module:engine/view/text~Text Texts},\n// {@link module:engine/view/emptyelement~EmptyElement EmptyElements},\n// {@link module:engine/view/uielement~UIElement UIElements},\n// {@link module:engine/view/attributeelement~AttributeElement AttributeElements} or\n// {@link module:engine/view/containerelement~ContainerElement ContainerElements}.\n//\n// @param Iterable. nodes\n// @param {Object} errorContext\nfunction validateNodesToInsert( nodes, errorContext ) {\n\tfor ( const node of nodes ) {\n\t\tif ( !validNodesToInsert.some( ( validNode => node instanceof validNode ) ) ) { // eslint-disable-line no-use-before-define\n\t\t\t/**\n\t\t\t * One of the nodes to be inserted is of invalid type.\n\t\t\t *\n\t\t\t * Nodes to be inserted with {@link module:engine/view/downcastwriter~DowncastWriter#insert `DowncastWriter#insert()`} should be\n\t\t\t * of the following types:\n\t\t\t *\n\t\t\t * * {@link module:engine/view/attributeelement~AttributeElement AttributeElement},\n\t\t\t * * {@link module:engine/view/containerelement~ContainerElement ContainerElement},\n\t\t\t * * {@link module:engine/view/emptyelement~EmptyElement EmptyElement},\n\t\t\t * * {@link module:engine/view/uielement~UIElement UIElement},\n\t\t\t * * {@link module:engine/view/rawelement~RawElement RawElement},\n\t\t\t * * {@link module:engine/view/text~Text Text}.\n\t\t\t *\n\t\t\t * @error view-writer-insert-invalid-node-type\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-writer-insert-invalid-node-type: One of the nodes to be inserted is of invalid type.',\n\t\t\t\terrorContext\n\t\t\t);\n\t\t}\n\n\t\tif ( !node.is( '$text' ) ) {\n\t\t\tvalidateNodesToInsert( node.getChildren(), errorContext );\n\t\t}\n\t}\n}\n\nconst validNodesToInsert = [ Text, AttributeElement, ContainerElement, EmptyElement, RawElement, UIElement ];\n\n// Checks if node is ContainerElement or DocumentFragment, because in most cases they should be treated the same way.\n//\n// @param {module:engine/view/node~Node} node\n// @returns {Boolean} Returns `true` if node is instance of ContainerElement or DocumentFragment.\nfunction isContainerOrFragment( node ) {\n\treturn node && ( node.is( 'containerElement' ) || node.is( 'documentFragment' ) );\n}\n\n// Checks if {@link module:engine/view/range~Range#start range start} and {@link module:engine/view/range~Range#end range end} are placed\n// inside same {@link module:engine/view/containerelement~ContainerElement container element}.\n// Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when validation fails.\n//\n// @param {module:engine/view/range~Range} range\n// @param {Object} errorContext\nfunction validateRangeContainer( range, errorContext ) {\n\tconst startContainer = getParentContainer( range.start );\n\tconst endContainer = getParentContainer( range.end );\n\n\tif ( !startContainer || !endContainer || startContainer !== endContainer ) {\n\t\t/**\n\t\t * The container of the given range is invalid.\n\t\t *\n\t\t * This may happen if {@link module:engine/view/range~Range#start range start} and\n\t\t * {@link module:engine/view/range~Range#end range end} positions are not placed inside the same container element or\n\t\t * a parent container for these positions cannot be found.\n\t\t *\n\t\t * Methods like {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#remove()`},\n\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#clean()`},\n\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#wrap()`},\n\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#unwrap()`} need to be called\n\t\t * on a range that have its start and end positions located in the same container element. Both positions can be\n\t\t * nested within other elements (e.g. an attribute element) but the closest container ancestor must be the same.\n\t\t *\n\t\t * @error view-writer-invalid-range-container\n\t\t */\n\t\tthrow new CKEditorError( 'view-writer-invalid-range-container: The container of the given range is invalid.', errorContext );\n\t}\n}\n\n// Checks if two attribute elements can be joined together. Elements can be joined together if, and only if\n// they do not have ids specified.\n//\n// @private\n// @param {module:engine/view/element~Element} a\n// @param {module:engine/view/element~Element} b\n// @returns {Boolean}\nfunction canBeJoined( a, b ) {\n\treturn a.id === null && b.id === null;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/istext\n */\n\n/**\n * Checks if the object is a native DOM Text node.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isText( obj ) {\n\treturn Object.prototype.toString.call( obj ) == '[object Text]';\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\n\n/**\n * Set of utils related to block and inline fillers handling.\n *\n * Browsers do not allow to put caret in elements which does not have height. Because of it, we need to fill all\n * empty elements which should be selectable with elements or characters called \"fillers\". Unfortunately there is no one\n * universal filler, this is why two types are uses:\n *\n * * Block filler is an element which fill block elements, like ``. CKEditor uses ` ` as a block filler during the editing,\n * as browsers do natively. So instead of an empty `
` there will be `
`. The advantage of block filler is that\n * it is transparent for the selection, so when the caret is before the ` ` and user presses right arrow he will be\n * moved to the next paragraph, not after the ` `. The disadvantage is that it breaks a block, so it can not be used\n * in the middle of a line of text. The {@link module:engine/view/filler~BR_FILLER ` ` filler} can be replaced with any other\n * character in the data output, for instance {@link module:engine/view/filler~NBSP_FILLER non-breaking space}.\n *\n * * Inline filler is a filler which does not break a line of text, so it can be used inside the text, for instance in the empty\n * `` surrendered by text: `foo bar`, if we want to put the caret there. CKEditor uses a sequence of the zero-width\n * spaces as an {@link module:engine/view/filler~INLINE_FILLER inline filler} having the predetermined\n * {@link module:engine/view/filler~INLINE_FILLER_LENGTH length}. A sequence is used, instead of a single character to\n * avoid treating random zero-width spaces as the inline filler. Disadvantage of the inline filler is that it is not\n * transparent for the selection. The arrow key moves the caret between zero-width spaces characters, so the additional\n * code is needed to handle the caret.\n *\n * Both inline and block fillers are handled by the {@link module:engine/view/renderer~Renderer renderer} and are not present in the\n * view.\n *\n * @module engine/view/filler\n */\n\n/**\n * Non-breaking space filler creator. This is a function which creates ` ` text node.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~BR_FILLER\n * @function\n */\nexport const NBSP_FILLER = domDocument => domDocument.createTextNode( '\\u00A0' );\n\n/**\n * ` ` filler creator. This is a function which creates ` ` element.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~NBSP_FILLER\n * @function\n */\nexport const BR_FILLER = domDocument => {\n\tconst fillerBr = domDocument.createElement( 'br' );\n\tfillerBr.dataset.ckeFiller = true;\n\n\treturn fillerBr;\n};\n\n/**\n * Length of the {@link module:engine/view/filler~INLINE_FILLER INLINE_FILLER}.\n */\nexport const INLINE_FILLER_LENGTH = 7;\n\n/**\n * Inline filler which is a sequence of the zero width spaces.\n *\n * @type {String}\n */\nexport const INLINE_FILLER = ( () => {\n\tlet inlineFiller = '';\n\n\tfor ( let i = 0; i < INLINE_FILLER_LENGTH; i++ ) {\n\t\tinlineFiller += '\\u200b';\n\t}\n\n\treturn inlineFiller;\n} )(); // Usu IIF so the INLINE_FILLER appears as a constant in the docs.\n\n/**\n * Checks if the node is a text node which starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( 'foo' ) ); // false\n *\t\tstartsWithFiller( document.createElement( 'p' ) ); // false\n *\n * @param {Node} domNode DOM node.\n * @returns {Boolean} True if the text node starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function startsWithFiller( domNode ) {\n\treturn isText( domNode ) && ( domNode.data.substr( 0, INLINE_FILLER_LENGTH ) === INLINE_FILLER );\n}\n\n/**\n * Checks if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // false\n *\n * @param {Text} domText DOM text node.\n * @returns {Boolean} True if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function isInlineFiller( domText ) {\n\treturn domText.data.length == INLINE_FILLER_LENGTH && startsWithFiller( domText );\n}\n\n/**\n * Get string data from the text node, removing an {@link module:engine/view/filler~INLINE_FILLER inline filler} from it,\n * if text node contains it.\n *\n *\t\tgetDataWithoutFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ) == 'foo' // true\n *\t\tgetDataWithoutFiller( document.createTextNode( 'foo' ) ) == 'foo' // true\n *\n * @param {Text} domText DOM text node, possible with inline filler.\n * @returns {String} Data without filler.\n */\nexport function getDataWithoutFiller( domText ) {\n\tif ( startsWithFiller( domText ) ) {\n\t\treturn domText.data.slice( INLINE_FILLER_LENGTH );\n\t} else {\n\t\treturn domText.data;\n\t}\n}\n\n/**\n * Assign key observer which move cursor from the end of the inline filler to the beginning of it when\n * the left arrow is pressed, so the filler does not break navigation.\n *\n * @param {module:engine/view/view~View} view View controller instance we should inject quirks handling on.\n */\nexport function injectQuirksHandling( view ) {\n\tview.document.on( 'keydown', jumpOverInlineFiller );\n}\n\n// Move cursor from the end of the inline filler to the beginning of it when, so the filler does not break navigation.\nfunction jumpOverInlineFiller( evt, data ) {\n\tif ( data.keyCode == keyCodes.arrowleft ) {\n\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\n\t\tif ( domSelection.rangeCount == 1 && domSelection.getRangeAt( 0 ).collapsed ) {\n\t\t\tconst domParent = domSelection.getRangeAt( 0 ).startContainer;\n\t\t\tconst domOffset = domSelection.getRangeAt( 0 ).startOffset;\n\n\t\t\tif ( startsWithFiller( domParent ) && domOffset <= INLINE_FILLER_LENGTH ) {\n\t\t\t\tdomSelection.collapse( domParent, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/fastdiff\n */\n\n/**\n * Finds positions of the first and last change in the given string/array and generates a set of changes:\n *\n *\t\tfastDiff( '12a', '12xyza' );\n *\t\t// [ { index: 2, type: 'insert', values: [ 'x', 'y', 'z' ] } ]\n *\n *\t\tfastDiff( '12a', '12aa' );\n *\t\t// [ { index: 3, type: 'insert', values: [ 'a' ] } ]\n *\n *\t\tfastDiff( '12xyza', '12a' );\n *\t\t// [ { index: 2, type: 'delete', howMany: 3 } ]\n *\n *\t\tfastDiff( [ '1', '2', 'a', 'a' ], [ '1', '2', 'a' ] );\n *\t\t// [ { index: 3, type: 'delete', howMany: 1 } ]\n *\n *\t\tfastDiff( [ '1', '2', 'a', 'b', 'c', '3' ], [ '2', 'a', 'b' ] );\n *\t\t// [ { index: 0, type: 'insert', values: [ '2', 'a', 'b' ] }, { index: 3, type: 'delete', howMany: 6 } ]\n *\n * Passed arrays can contain any type of data, however to compare them correctly custom comparator function\n * should be passed as a third parameter:\n *\n *\t\tfastDiff( [ { value: 1 }, { value: 2 } ], [ { value: 1 }, { value: 3 } ], ( a, b ) => {\n *\t\t\treturn a.value === b.value;\n *\t\t} );\n *\t\t// [ { index: 1, type: 'insert', values: [ { value: 3 } ] }, { index: 2, type: 'delete', howMany: 1 } ]\n *\n * The resulted set of changes can be applied to the input in order to transform it into the output, for example:\n *\n *\t\tlet input = '12abc3';\n *\t\tconst output = '2ab';\n *\t\tconst changes = fastDiff( input, output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + change.values.join( '' ) + input.substring( change.index );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + input.substring( change.index + change.howMany );\n *\t\t\t}\n *\t\t} );\n *\n *\t\t// input equals output now\n *\n * or in case of arrays:\n *\n *\t\tlet input = [ '1', '2', 'a', 'b', 'c', '3' ];\n *\t\tconst output = [ '2', 'a', 'b' ];\n *\t\tconst changes = fastDiff( input, output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput = input.slice( 0, change.index ).concat( change.values, input.slice( change.index ) );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput = input.slice( 0, change.index ).concat( input.slice( change.index + change.howMany ) );\n *\t\t\t}\n *\t\t} );\n *\n *\t\t// input equals output now\n *\n * By passing `true` as the fourth parameter (`atomicChanges`) the output of this function will become compatible with\n * the {@link module:utils/diff~diff `diff()`} function:\n *\n *\t\tfastDiff( '12a', '12xyza' );\n *\t\t// [ 'equal', 'equal', 'insert', 'insert', 'insert', 'equal' ]\n *\n * The default output format of this function is compatible with the output format of\n * {@link module:utils/difftochanges~diffToChanges `diffToChanges()`}. The `diffToChanges()` input format is, in turn,\n * compatible with the output of {@link module:utils/diff~diff `diff()`}:\n *\n *\t\tconst a = '1234';\n *\t\tconst b = '12xyz34';\n *\n *\t\t// Both calls will return the same results (grouped changes format).\n *\t\tfastDiff( a, b );\n *\t\tdiffToChanges( diff( a, b ) );\n *\n *\t\t// Again, both calls will return the same results (atomic changes format).\n *\t\tfastDiff( a, b, null, true );\n *\t\tdiff( a, b );\n *\n *\n * @param {Array|String} a Input array or string.\n * @param {Array|String} b Input array or string.\n * @param {Function} [cmp] Optional function used to compare array values, by default `===` (strict equal operator) is used.\n * @param {Boolean} [atomicChanges=false] Whether an array of `inset|delete|equal` operations should\n * be returned instead of changes set. This makes this function compatible with {@link module:utils/diff~diff `diff()`}.\n * @returns {Array} Array of changes.\n */\nexport default function fastDiff( a, b, cmp, atomicChanges = false ) {\n\t// Set the comparator function.\n\tcmp = cmp || function( a, b ) {\n\t\treturn a === b;\n\t};\n\n\t// Convert the string (or any array-like object - eg. NodeList) to an array by using the slice() method because,\n\t// unlike Array.from(), it returns array of UTF-16 code units instead of the code points of a string.\n\t// One code point might be a surrogate pair of two code units. All text offsets are expected to be in code units.\n\t// See ckeditor/ckeditor5#3147.\n\t//\n\t// We need to make sure here that fastDiff() works identical to diff().\n\tif ( !Array.isArray( a ) ) {\n\t\ta = Array.prototype.slice.call( a );\n\t}\n\n\tif ( !Array.isArray( b ) ) {\n\t\tb = Array.prototype.slice.call( b );\n\t}\n\n\t// Find first and last change.\n\tconst changeIndexes = findChangeBoundaryIndexes( a, b, cmp );\n\n\t// Transform into changes array.\n\treturn atomicChanges ? changeIndexesToAtomicChanges( changeIndexes, b.length ) : changeIndexesToChanges( b, changeIndexes );\n}\n\n// Finds position of the first and last change in the given arrays. For example:\n//\n//\t\tconst indexes = findChangeBoundaryIndexes( [ '1', '2', '3', '4' ], [ '1', '3', '4', '2', '4' ] );\n//\t\tconsole.log( indexes ); // { firstIndex: 1, lastIndexOld: 3, lastIndexNew: 4 }\n//\n// The above indexes means that in the first array the modified part is `1[23]4` and in the second array it is `1[342]4`.\n// Based on such indexes, array with `insert`/`delete` operations which allows transforming first value into the second one\n// can be generated.\n//\n// @param {Array} arr1\n// @param {Array} arr2\n// @param {Function} cmp Comparator function.\n// @returns {Object}\n// @returns {Number} return.firstIndex Index of the first change in both values (always the same for both).\n// @returns {Number} result.lastIndexOld Index of the last common value in `arr1`.\n// @returns {Number} result.lastIndexNew Index of the last common value in `arr2`.\nfunction findChangeBoundaryIndexes( arr1, arr2, cmp ) {\n\t// Find the first difference between passed values.\n\tconst firstIndex = findFirstDifferenceIndex( arr1, arr2, cmp );\n\n\t// If arrays are equal return -1 indexes object.\n\tif ( firstIndex === -1 ) {\n\t\treturn { firstIndex: -1, lastIndexOld: -1, lastIndexNew: -1 };\n\t}\n\n\t// Remove the common part of each value and reverse them to make it simpler to find the last difference between them.\n\tconst oldArrayReversed = cutAndReverse( arr1, firstIndex );\n\tconst newArrayReversed = cutAndReverse( arr2, firstIndex );\n\n\t// Find the first difference between reversed values.\n\t// It should be treated as \"how many elements from the end the last difference occurred\".\n\t//\n\t// For example:\n\t//\n\t// \t\t\t\tinitial\t->\tafter cut\t-> reversed:\n\t// oldValue:\t'321ba'\t->\t'21ba'\t\t-> 'ab12'\n\t// newValue:\t'31xba'\t->\t'1xba'\t\t-> 'abx1'\n\t// lastIndex:\t\t\t\t\t\t\t-> 2\n\t//\n\t// So the last change occurred two characters from the end of the arrays.\n\tconst lastIndex = findFirstDifferenceIndex( oldArrayReversed, newArrayReversed, cmp );\n\n\t// Use `lastIndex` to calculate proper offset, starting from the beginning (`lastIndex` kind of starts from the end).\n\tconst lastIndexOld = arr1.length - lastIndex;\n\tconst lastIndexNew = arr2.length - lastIndex;\n\n\treturn { firstIndex, lastIndexOld, lastIndexNew };\n}\n\n// Returns a first index on which given arrays differ. If both arrays are the same, -1 is returned.\n//\n// @param {Array} arr1\n// @param {Array} arr2\n// @param {Function} cmp Comparator function.\n// @returns {Number}\nfunction findFirstDifferenceIndex( arr1, arr2, cmp ) {\n\tfor ( let i = 0; i < Math.max( arr1.length, arr2.length ); i++ ) {\n\t\tif ( arr1[ i ] === undefined || arr2[ i ] === undefined || !cmp( arr1[ i ], arr2[ i ] ) ) {\n\t\t\treturn i;\n\t\t}\n\t}\n\n\treturn -1; // Return -1 if arrays are equal.\n}\n\n// Returns a copy of the given array with `howMany` elements removed starting from the beginning and in reversed order.\n//\n// @param {Array} arr Array to be processed.\n// @param {Number} howMany How many elements from array beginning to remove.\n// @returns {Array} Shortened and reversed array.\nfunction cutAndReverse( arr, howMany ) {\n\treturn arr.slice( howMany ).reverse();\n}\n\n// Generates changes array based on change indexes from `findChangeBoundaryIndexes` function. This function will\n// generate array with 0 (no changes), 1 (deletion or insertion) or 2 records (insertion and deletion).\n//\n// @param {Array} newArray New array for which change indexes were calculated.\n// @param {Object} changeIndexes Change indexes object from `findChangeBoundaryIndexes` function.\n// @returns {Array.} Array of changes compatible with {@link module:utils/difftochanges~diffToChanges} format.\nfunction changeIndexesToChanges( newArray, changeIndexes ) {\n\tconst result = [];\n\tconst { firstIndex, lastIndexOld, lastIndexNew } = changeIndexes;\n\n\t// Order operations as 'insert', 'delete' array to keep compatibility with {@link module:utils/difftochanges~diffToChanges}\n\t// in most cases. However, 'diffToChanges' does not stick to any order so in some cases\n\t// (for example replacing '12345' with 'abcd') it will generate 'delete', 'insert' order.\n\tif ( lastIndexNew - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex,\n\t\t\ttype: 'insert',\n\t\t\tvalues: newArray.slice( firstIndex, lastIndexNew )\n\t\t} );\n\t}\n\n\tif ( lastIndexOld - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex + ( lastIndexNew - firstIndex ), // Increase index of what was inserted.\n\t\t\ttype: 'delete',\n\t\t\thowMany: lastIndexOld - firstIndex\n\t\t} );\n\t}\n\n\treturn result;\n}\n\n// Generates array with set `equal|insert|delete` operations based on change indexes from `findChangeBoundaryIndexes` function.\n//\n// @param {Object} changeIndexes Change indexes object from `findChangeBoundaryIndexes` function.\n// @param {Number} newLength Length of the new array on which `findChangeBoundaryIndexes` calculated change indexes.\n// @returns {Array.} Array of changes compatible with {@link module:utils/diff~diff} format.\nfunction changeIndexesToAtomicChanges( changeIndexes, newLength ) {\n\tconst { firstIndex, lastIndexOld, lastIndexNew } = changeIndexes;\n\n\t// No changes.\n\tif ( firstIndex === -1 ) {\n\t\treturn Array( newLength ).fill( 'equal' );\n\t}\n\n\tlet result = [];\n\tif ( firstIndex > 0 ) {\n\t\tresult = result.concat( Array( firstIndex ).fill( 'equal' ) );\n\t}\n\n\tif ( lastIndexNew - firstIndex > 0 ) {\n\t\tresult = result.concat( Array( lastIndexNew - firstIndex ).fill( 'insert' ) );\n\t}\n\n\tif ( lastIndexOld - firstIndex > 0 ) {\n\t\tresult = result.concat( Array( lastIndexOld - firstIndex ).fill( 'delete' ) );\n\t}\n\n\tif ( lastIndexNew < newLength ) {\n\t\tresult = result.concat( Array( newLength - lastIndexNew ).fill( 'equal' ) );\n\t}\n\n\treturn result;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/diff\n */\n\nimport fastDiff from '../src/fastdiff';\n\n// The following code is based on the \"O(NP) Sequence Comparison Algorithm\"\n// by Sun Wu, Udi Manber, Gene Myers, Webb Miller.\n\n/**\n * Calculates the difference between two arrays or strings producing an array containing a list of changes\n * necessary to transform input into output.\n *\n *\t\tdiff( 'aba', 'acca' ); // [ 'equal', 'insert', 'insert', 'delete', 'equal' ]\n *\n * This function is based on the \"O(NP) Sequence Comparison Algorithm\" by Sun Wu, Udi Manber, Gene Myers, Webb Miller.\n * Unfortunately, while it gives the most precise results, its to complex for longer strings/arrow (above 200 items).\n * Therefore, `diff()` automatically switches to {@link module:utils/fastdiff~fastDiff `fastDiff()`} when detecting\n * such a scenario. The return formats of both functions are identical.\n *\n * @param {Array|String} a Input array or string.\n * @param {Array|String} b Output array or string.\n * @param {Function} [cmp] Optional function used to compare array values, by default === is used.\n * @returns {Array} Array of changes.\n */\nexport default function diff( a, b, cmp ) {\n\t// Set the comparator function.\n\tcmp = cmp || function( a, b ) {\n\t\treturn a === b;\n\t};\n\n\tconst aLength = a.length;\n\tconst bLength = b.length;\n\n\t// Perform `fastDiff` for longer strings/arrays (see #269).\n\tif ( aLength > 200 || bLength > 200 || aLength + bLength > 300 ) {\n\t\treturn diff.fastDiff( a, b, cmp, true );\n\t}\n\n\t// Temporary action type statics.\n\tlet _insert, _delete;\n\n\t// Swapped the arrays to use the shorter one as the first one.\n\tif ( bLength < aLength ) {\n\t\tconst tmp = a;\n\n\t\ta = b;\n\t\tb = tmp;\n\n\t\t// We swap the action types as well.\n\t\t_insert = 'delete';\n\t\t_delete = 'insert';\n\t} else {\n\t\t_insert = 'insert';\n\t\t_delete = 'delete';\n\t}\n\n\tconst m = a.length;\n\tconst n = b.length;\n\tconst delta = n - m;\n\n\t// Edit scripts, for each diagonal.\n\tconst es = {};\n\t// Furthest points, the furthest y we can get on each diagonal.\n\tconst fp = {};\n\n\tfunction snake( k ) {\n\t\t// We use -1 as an alternative below to handle initial values ( instead of filling the fp with -1 first ).\n\t\t// Furthest points (y) on the diagonal below k.\n\t\tconst y1 = ( fp[ k - 1 ] !== undefined ? fp[ k - 1 ] : -1 ) + 1;\n\t\t// Furthest points (y) on the diagonal above k.\n\t\tconst y2 = fp[ k + 1 ] !== undefined ? fp[ k + 1 ] : -1;\n\t\t// The way we should go to get further.\n\t\tconst dir = y1 > y2 ? -1 : 1;\n\n\t\t// Clone previous changes array (if any).\n\t\tif ( es[ k + dir ] ) {\n\t\t\tes[ k ] = es[ k + dir ].slice( 0 );\n\t\t}\n\n\t\t// Create changes array.\n\t\tif ( !es[ k ] ) {\n\t\t\tes[ k ] = [];\n\t\t}\n\n\t\t// Push the action.\n\t\tes[ k ].push( y1 > y2 ? _insert : _delete );\n\n\t\t// Set the beginning coordinates.\n\t\tlet y = Math.max( y1, y2 );\n\t\tlet x = y - k;\n\n\t\t// Traverse the diagonal as long as the values match.\n\t\twhile ( x < m && y < n && cmp( a[ x ], b[ y ] ) ) {\n\t\t\tx++;\n\t\t\ty++;\n\t\t\t// Push no change action.\n\t\t\tes[ k ].push( 'equal' );\n\t\t}\n\n\t\treturn y;\n\t}\n\n\tlet p = 0;\n\tlet k;\n\n\t// Traverse the graph until we reach the end of the longer string.\n\tdo {\n\t\t// Updates furthest points and edit scripts for diagonals below delta.\n\t\tfor ( k = -p; k < delta; k++ ) {\n\t\t\tfp[ k ] = snake( k );\n\t\t}\n\n\t\t// Updates furthest points and edit scripts for diagonals above delta.\n\t\tfor ( k = delta + p; k > delta; k-- ) {\n\t\t\tfp[ k ] = snake( k );\n\t\t}\n\n\t\t// Updates furthest point and edit script for the delta diagonal.\n\t\t// note that the delta diagonal is the one which goes through the sink (m, n).\n\t\tfp[ delta ] = snake( delta );\n\n\t\tp++;\n\t} while ( fp[ delta ] !== n );\n\n\t// Return the final list of edit changes.\n\t// We remove the first item that represents the action for the injected nulls.\n\treturn es[ delta ].slice( 1 );\n}\n\n// Store the API in static property to easily overwrite it in tests.\n// Too bad dependency injection does not work in Webpack + ES 6 (const) + Babel.\ndiff.fastDiff = fastDiff;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/insertat\n */\n\n/**\n * Inserts node to the parent at given index.\n *\n * @param {Element} parentElement Parent element.\n * @param {Number} index Insertions index.\n * @param {Node} nodeToInsert Node to insert.\n */\nexport default function insertAt( parentElement, index, nodeToInsert ) {\n\tparentElement.insertBefore( nodeToInsert, parentElement.childNodes[ index ] || null );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/remove\n */\n\n/**\n * Removes given node from parent.\n *\n * @param {Node} node Node to remove.\n */\nexport default function remove( node ) {\n\tconst parent = node.parentNode;\n\n\tif ( parent ) {\n\t\tparent.removeChild( node );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/isnode\n */\n\n/**\n * Checks if the object is a native DOM Node.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isNode( obj ) {\n\tif ( obj ) {\n\t\tif ( obj.defaultView ) {\n\t\t\treturn obj instanceof obj.defaultView.Document;\n\t\t} else if ( obj.ownerDocument && obj.ownerDocument.defaultView ) {\n\t\t\treturn obj instanceof obj.ownerDocument.defaultView.Node;\n\t\t}\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals Node */\n\n/**\n * @module engine/view/renderer\n */\n\nimport ViewText from './text';\nimport ViewPosition from './position';\nimport { INLINE_FILLER, INLINE_FILLER_LENGTH, startsWithFiller, isInlineFiller } from './filler';\n\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\nimport insertAt from '@ckeditor/ckeditor5-utils/src/dom/insertat';\nimport remove from '@ckeditor/ckeditor5-utils/src/dom/remove';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\nimport isNode from '@ckeditor/ckeditor5-utils/src/dom/isnode';\nimport fastDiff from '@ckeditor/ckeditor5-utils/src/fastdiff';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\n/**\n * Renderer is responsible for updating the DOM structure and the DOM selection based on\n * the {@link module:engine/view/renderer~Renderer#markToSync information about updated view nodes}.\n * In other words, it renders the view to the DOM.\n *\n * Its main responsibility is to make only the necessary, minimal changes to the DOM. However, unlike in many\n * virtual DOM implementations, the primary reason for doing minimal changes is not the performance but ensuring\n * that native editing features such as text composition, autocompletion, spell checking, selection's x-index are\n * affected as little as possible.\n *\n * Renderer uses {@link module:engine/view/domconverter~DomConverter} to transform view nodes and positions\n * to and from the DOM.\n */\nexport default class Renderer {\n\t/**\n\t * Creates a renderer instance.\n\t *\n\t * @param {module:engine/view/domconverter~DomConverter} domConverter Converter instance.\n\t * @param {module:engine/view/documentselection~DocumentSelection} selection View selection.\n\t */\n\tconstructor( domConverter, selection ) {\n\t\t/**\n\t\t * Set of DOM Documents instances.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.}\n\t\t */\n\t\tthis.domDocuments = new Set();\n\n\t\t/**\n\t\t * Converter instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = domConverter;\n\n\t\t/**\n\t\t * Set of nodes which attributes changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.}\n\t\t */\n\t\tthis.markedAttributes = new Set();\n\n\t\t/**\n\t\t * Set of elements which child lists changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.}\n\t\t */\n\t\tthis.markedChildren = new Set();\n\n\t\t/**\n\t\t * Set of text nodes which text data changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.}\n\t\t */\n\t\tthis.markedTexts = new Set();\n\n\t\t/**\n\t\t * View selection. Renderer updates DOM selection based on the view selection.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection}\n\t\t */\n\t\tthis.selection = selection;\n\n\t\t/**\n\t\t * Indicates if the view document is focused and selection can be rendered. Selection will not be rendered if\n\t\t * this is set to `false`.\n\t\t *\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.isFocused = false;\n\n\t\t/**\n\t\t * The text node in which the inline filler was rendered.\n\t\t *\n\t\t * @private\n\t\t * @member {Text}\n\t\t */\n\t\tthis._inlineFiller = null;\n\n\t\t/**\n\t\t * DOM element containing fake selection.\n\t\t *\n\t\t * @private\n\t\t * @type {null|HTMLElement}\n\t\t */\n\t\tthis._fakeSelectionContainer = null;\n\t}\n\n\t/**\n\t * Marks a view node to be updated in the DOM by {@link #render `render()`}.\n\t *\n\t * Note that only view nodes whose parents have corresponding DOM elements need to be marked to be synchronized.\n\t *\n\t * @see #markedAttributes\n\t * @see #markedChildren\n\t * @see #markedTexts\n\t *\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Node to be marked.\n\t */\n\tmarkToSync( type, node ) {\n\t\tif ( type === 'text' ) {\n\t\t\tif ( this.domConverter.mapViewToDom( node.parent ) ) {\n\t\t\t\tthis.markedTexts.add( node );\n\t\t\t}\n\t\t} else {\n\t\t\t// If the node has no DOM element it is not rendered yet,\n\t\t\t// its children/attributes do not need to be marked to be sync.\n\t\t\tif ( !this.domConverter.mapViewToDom( node ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif ( type === 'attributes' ) {\n\t\t\t\tthis.markedAttributes.add( node );\n\t\t\t} else if ( type === 'children' ) {\n\t\t\t\tthis.markedChildren.add( node );\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * Unknown type passed to Renderer.markToSync.\n\t\t\t\t *\n\t\t\t\t * @error renderer-unknown-type\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'view-renderer-unknown-type: Unknown type passed to Renderer.markToSync.', this );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Renders all buffered changes ({@link #markedAttributes}, {@link #markedChildren} and {@link #markedTexts}) and\n\t * the current view selection (if needed) to the DOM by applying a minimal set of changes to it.\n\t *\n\t * Renderer tries not to break the text composition (e.g. IME) and x-index of the selection,\n\t * so it does as little as it is needed to update the DOM.\n\t *\n\t * Renderer also handles {@link module:engine/view/filler fillers}. Especially, it checks if the inline filler is needed\n\t * at the selection position and adds or removes it. To prevent breaking text composition inline filler will not be\n\t * removed as long as the selection is in the text node which needed it at first.\n\t */\n\trender() {\n\t\tlet inlineFillerPosition;\n\n\t\t// Refresh mappings.\n\t\tfor ( const element of this.markedChildren ) {\n\t\t\tthis._updateChildrenMappings( element );\n\t\t}\n\n\t\t// There was inline filler rendered in the DOM but it's not\n\t\t// at the selection position any more, so we can remove it\n\t\t// (cause even if it's needed, it must be placed in another location).\n\t\tif ( this._inlineFiller && !this._isSelectionInInlineFiller() ) {\n\t\t\tthis._removeInlineFiller();\n\t\t}\n\n\t\t// If we've got the filler, let's try to guess its position in the view.\n\t\tif ( this._inlineFiller ) {\n\t\t\tinlineFillerPosition = this._getInlineFillerPosition();\n\t\t}\n\t\t// Otherwise, if it's needed, create it at the selection position.\n\t\telse if ( this._needsInlineFillerAtSelection() ) {\n\t\t\tinlineFillerPosition = this.selection.getFirstPosition();\n\n\t\t\t// Do not use `markToSync` so it will be added even if the parent is already added.\n\t\t\tthis.markedChildren.add( inlineFillerPosition.parent );\n\t\t}\n\n\t\tfor ( const element of this.markedAttributes ) {\n\t\t\tthis._updateAttrs( element );\n\t\t}\n\n\t\tfor ( const element of this.markedChildren ) {\n\t\t\tthis._updateChildren( element, { inlineFillerPosition } );\n\t\t}\n\n\t\tfor ( const node of this.markedTexts ) {\n\t\t\tif ( !this.markedChildren.has( node.parent ) && this.domConverter.mapViewToDom( node.parent ) ) {\n\t\t\t\tthis._updateText( node, { inlineFillerPosition } );\n\t\t\t}\n\t\t}\n\n\t\t// Check whether the inline filler is required and where it really is in the DOM.\n\t\t// At this point in most cases it will be in the DOM, but there are exceptions.\n\t\t// For example, if the inline filler was deep in the created DOM structure, it will not be created.\n\t\t// Similarly, if it was removed at the beginning of this function and then neither text nor children were updated,\n\t\t// it will not be present.\n\t\t// Fix those and similar scenarios.\n\t\tif ( inlineFillerPosition ) {\n\t\t\tconst fillerDomPosition = this.domConverter.viewPositionToDom( inlineFillerPosition );\n\t\t\tconst domDocument = fillerDomPosition.parent.ownerDocument;\n\n\t\t\tif ( !startsWithFiller( fillerDomPosition.parent ) ) {\n\t\t\t\t// Filler has not been created at filler position. Create it now.\n\t\t\t\tthis._inlineFiller = addInlineFiller( domDocument, fillerDomPosition.parent, fillerDomPosition.offset );\n\t\t\t} else {\n\t\t\t\t// Filler has been found, save it.\n\t\t\t\tthis._inlineFiller = fillerDomPosition.parent;\n\t\t\t}\n\t\t} else {\n\t\t\t// There is no filler needed.\n\t\t\tthis._inlineFiller = null;\n\t\t}\n\n\t\tthis._updateSelection();\n\t\tthis._updateFocus();\n\n\t\tthis.markedTexts.clear();\n\t\tthis.markedAttributes.clear();\n\t\tthis.markedChildren.clear();\n\t}\n\n\t/**\n\t * Updates mappings of view element's children.\n\t *\n\t * Children that were replaced in the view structure by similar elements (same tag name) are treated as 'replaced'.\n\t * This means that their mappings can be updated so the new view elements are mapped to the existing DOM elements.\n\t * Thanks to that these elements do not need to be re-rendered completely.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewElement The view element whose children mappings will be updated.\n\t */\n\t_updateChildrenMappings( viewElement ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that it was already removed from DOM and there is no need to process it.\n\t\t\treturn;\n\t\t}\n\n\t\tconst actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;\n\t\tconst expectedDomChildren = Array.from(\n\t\t\tthis.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { withChildren: false } )\n\t\t);\n\t\tconst diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );\n\t\tconst actions = this._findReplaceActions( diff, actualDomChildren, expectedDomChildren );\n\n\t\tif ( actions.indexOf( 'replace' ) !== -1 ) {\n\t\t\tconst counter = { equal: 0, insert: 0, delete: 0 };\n\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action === 'replace' ) {\n\t\t\t\t\tconst insertIndex = counter.equal + counter.insert;\n\t\t\t\t\tconst deleteIndex = counter.equal + counter.delete;\n\t\t\t\t\tconst viewChild = viewElement.getChild( insertIndex );\n\n\t\t\t\t\t// UIElement and RawElement are special cases. Their children are not stored in a view (#799)\n\t\t\t\t\t// so we cannot use them with replacing flow (since they use view children during rendering\n\t\t\t\t\t// which will always result in rendering empty elements).\n\t\t\t\t\tif ( viewChild && !( viewChild.is( 'uiElement' ) || viewChild.is( 'rawElement' ) ) ) {\n\t\t\t\t\t\tthis._updateElementMappings( viewChild, actualDomChildren[ deleteIndex ] );\n\t\t\t\t\t}\n\n\t\t\t\t\tremove( expectedDomChildren[ insertIndex ] );\n\t\t\t\t\tcounter.equal++;\n\t\t\t\t} else {\n\t\t\t\t\tcounter[ action ]++;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Updates mappings of a given view element.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewElement The view element whose mappings will be updated.\n\t * @param {Node} domElement The DOM element representing the given view element.\n\t */\n\t_updateElementMappings( viewElement, domElement ) {\n\t\t// Remap 'DomConverter' bindings.\n\t\tthis.domConverter.unbindDomElement( domElement );\n\t\tthis.domConverter.bindElements( domElement, viewElement );\n\n\t\t// View element may have children which needs to be updated, but are not marked, mark them to update.\n\t\tthis.markedChildren.add( viewElement );\n\n\t\t// Because we replace new view element mapping with the existing one, the corresponding DOM element\n\t\t// will not be rerendered. The new view element may have different attributes than the previous one.\n\t\t// Since its corresponding DOM element will not be rerendered, new attributes will not be added\n\t\t// to the DOM, so we need to mark it here to make sure its attributes gets updated. See #1427 for more\n\t\t// detailed case study.\n\t\t// Also there are cases where replaced element is removed from the view structure and then has\n\t\t// its attributes changed or removed. In such cases the element will not be present in `markedAttributes`\n\t\t// and also may be the same (`element.isSimilar()`) as the reused element not having its attributes updated.\n\t\t// To prevent such situations we always mark reused element to have its attributes rerenderd (#1560).\n\t\tthis.markedAttributes.add( viewElement );\n\t}\n\n\t/**\n\t * Gets the position of the inline filler based on the current selection.\n\t * Here, we assume that we know that the filler is needed and\n\t * {@link #_isSelectionInInlineFiller is at the selection position}, and, since it is needed,\n\t * it is somewhere at the selection position.\n\t *\n\t * Note: The filler position cannot be restored based on the filler's DOM text node, because\n\t * when this method is called (before rendering), the bindings will often be broken. View-to-DOM\n\t * bindings are only dependable after rendering.\n\t *\n\t * @private\n\t * @returns {module:engine/view/position~Position}\n\t */\n\t_getInlineFillerPosition() {\n\t\tconst firstPos = this.selection.getFirstPosition();\n\n\t\tif ( firstPos.parent.is( '$text' ) ) {\n\t\t\treturn ViewPosition._createBefore( this.selection.getFirstPosition().parent );\n\t\t} else {\n\t\t\treturn firstPos;\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` if the selection has not left the inline filler's text node.\n\t * If it is `true`, it means that the filler had been added for a reason and the selection did not\n\t * leave the filler's text node. For example, the user can be in the middle of a composition so it should not be touched.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if the inline filler and selection are in the same place.\n\t */\n\t_isSelectionInInlineFiller() {\n\t\tif ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Note, we can't check if selection's position equals position of the\n\t\t// this._inlineFiller node, because of #663. We may not be able to calculate\n\t\t// the filler's position in the view at this stage.\n\t\t// Instead, we check it the other way – whether selection is anchored in\n\t\t// that text node or next to it.\n\n\t\t// Possible options are:\n\t\t// \"FILLER{}\"\n\t\t// \"FILLERadded-text{}\"\n\t\tconst selectionPosition = this.selection.getFirstPosition();\n\t\tconst position = this.domConverter.viewPositionToDom( selectionPosition );\n\n\t\tif ( position && isText( position.parent ) && startsWithFiller( position.parent ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Removes the inline filler.\n\t *\n\t * @private\n\t */\n\t_removeInlineFiller() {\n\t\tconst domFillerNode = this._inlineFiller;\n\n\t\t// Something weird happened and the stored node doesn't contain the filler's text.\n\t\tif ( !startsWithFiller( domFillerNode ) ) {\n\t\t\t/**\n\t\t\t * The inline filler node was lost. Most likely, something overwrote the filler text node\n\t\t\t * in the DOM.\n\t\t\t *\n\t\t\t * @error view-renderer-filler-was-lost\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-renderer-filler-was-lost: The inline filler node was lost.', this );\n\t\t}\n\n\t\tif ( isInlineFiller( domFillerNode ) ) {\n\t\t\tdomFillerNode.parentNode.removeChild( domFillerNode );\n\t\t} else {\n\t\t\tdomFillerNode.data = domFillerNode.data.substr( INLINE_FILLER_LENGTH );\n\t\t}\n\n\t\tthis._inlineFiller = null;\n\t}\n\n\t/**\n\t * Checks if the inline {@link module:engine/view/filler filler} should be added.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if the inline filler should be added.\n\t */\n\t_needsInlineFillerAtSelection() {\n\t\tif ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst selectionPosition = this.selection.getFirstPosition();\n\t\tconst selectionParent = selectionPosition.parent;\n\t\tconst selectionOffset = selectionPosition.offset;\n\n\t\t// If there is no DOM root we do not care about fillers.\n\t\tif ( !this.domConverter.mapViewToDom( selectionParent.root ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( !( selectionParent.is( 'element' ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Prevent adding inline filler inside elements with contenteditable=false.\n\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/1170\n\t\tif ( !isEditable( selectionParent ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// We have block filler, we do not need inline one.\n\t\tif ( selectionOffset === selectionParent.getFillerOffset() ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst nodeBefore = selectionPosition.nodeBefore;\n\t\tconst nodeAfter = selectionPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof ViewText || nodeAfter instanceof ViewText ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks if text needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} viewText View text to update.\n\t * @param {Object} options\n\t * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline\n\t * filler should be rendered.\n\t */\n\t_updateText( viewText, options ) {\n\t\tconst domText = this.domConverter.findCorrespondingDomText( viewText );\n\t\tconst newDomText = this.domConverter.viewToDom( viewText, domText.ownerDocument );\n\n\t\tconst actualText = domText.data;\n\t\tlet expectedText = newDomText.data;\n\n\t\tconst filler = options.inlineFillerPosition;\n\n\t\tif ( filler && filler.parent == viewText.parent && filler.offset == viewText.index ) {\n\t\t\texpectedText = INLINE_FILLER + expectedText;\n\t\t}\n\n\t\tif ( actualText != expectedText ) {\n\t\t\tconst actions = fastDiff( actualText, expectedText );\n\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action.type === 'insert' ) {\n\t\t\t\t\tdomText.insertData( action.index, action.values.join( '' ) );\n\t\t\t\t} else { // 'delete'\n\t\t\t\t\tdomText.deleteData( action.index, action.howMany );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if attribute list needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewElement The view element to update.\n\t */\n\t_updateAttrs( viewElement ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that 'viewElement' is outdated as its mapping was updated\n\t\t\t// in 'this._updateChildrenMappings()'. There is no need to process it as new view element which\n\t\t\t// replaced old 'viewElement' mapping was also added to 'this.markedAttributes'\n\t\t\t// in 'this._updateChildrenMappings()' so it will be processed separately.\n\t\t\treturn;\n\t\t}\n\n\t\tconst domAttrKeys = Array.from( domElement.attributes ).map( attr => attr.name );\n\t\tconst viewAttrKeys = viewElement.getAttributeKeys();\n\n\t\t// Add or overwrite attributes.\n\t\tfor ( const key of viewAttrKeys ) {\n\t\t\tdomElement.setAttribute( key, viewElement.getAttribute( key ) );\n\t\t}\n\n\t\t// Remove from DOM attributes which do not exists in the view.\n\t\tfor ( const key of domAttrKeys ) {\n\t\t\tif ( !viewElement.hasAttribute( key ) ) {\n\t\t\t\tdomElement.removeAttribute( key );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if elements child list needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewElement View element to update.\n\t * @param {Object} options\n\t * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline\n\t * filler should be rendered.\n\t */\n\t_updateChildren( viewElement, options ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that it was already removed from DOM.\n\t\t\t// There is no need to process it. It will be processed when re-inserted.\n\t\t\treturn;\n\t\t}\n\n\t\tconst inlineFillerPosition = options.inlineFillerPosition;\n\t\tconst actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;\n\t\tconst expectedDomChildren = Array.from(\n\t\t\tthis.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { bind: true, inlineFillerPosition } )\n\t\t);\n\n\t\t// Inline filler element has to be created as it is present in the DOM, but not in the view. It is required\n\t\t// during diffing so text nodes could be compared correctly and also during rendering to maintain\n\t\t// proper order and indexes while updating the DOM.\n\t\tif ( inlineFillerPosition && inlineFillerPosition.parent === viewElement ) {\n\t\t\taddInlineFiller( domElement.ownerDocument, expectedDomChildren, inlineFillerPosition.offset );\n\t\t}\n\n\t\tconst diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );\n\n\t\tlet i = 0;\n\t\tconst nodesToUnbind = new Set();\n\n\t\t// Handle deletions first.\n\t\t// This is to prevent a situation where an element that already exists in `actualDomChildren` is inserted at a different\n\t\t// index in `actualDomChildren`. Since `actualDomChildren` is a `NodeList`, this works like move, not like an insert,\n\t\t// and it disrupts the whole algorithm. See https://github.com/ckeditor/ckeditor5/issues/6367.\n\t\t//\n\t\t// It doesn't matter in what order we remove or add nodes, as long as we remove and add correct nodes at correct indexes.\n\t\tfor ( const action of diff ) {\n\t\t\tif ( action === 'delete' ) {\n\t\t\t\tnodesToUnbind.add( actualDomChildren[ i ] );\n\t\t\t\tremove( actualDomChildren[ i ] );\n\t\t\t} else if ( action === 'equal' ) {\n\t\t\t\ti++;\n\t\t\t}\n\t\t}\n\n\t\ti = 0;\n\n\t\tfor ( const action of diff ) {\n\t\t\tif ( action === 'insert' ) {\n\t\t\t\tinsertAt( domElement, i, expectedDomChildren[ i ] );\n\t\t\t\ti++;\n\t\t\t} else if ( action === 'equal' ) {\n\t\t\t\t// Force updating text nodes inside elements which did not change and do not need to be re-rendered (#1125).\n\t\t\t\t// Do it here (not in the loop above) because only after insertions the `i` index is correct.\n\t\t\t\tthis._markDescendantTextToSync( this.domConverter.domToView( expectedDomChildren[ i ] ) );\n\t\t\t\ti++;\n\t\t\t}\n\t\t}\n\n\t\t// Unbind removed nodes. When node does not have a parent it means that it was removed from DOM tree during\n\t\t// comparison with the expected DOM. We don't need to check child nodes, because if child node was reinserted,\n\t\t// it was moved to DOM tree out of the removed node.\n\t\tfor ( const node of nodesToUnbind ) {\n\t\t\tif ( !node.parentNode ) {\n\t\t\t\tthis.domConverter.unbindDomElement( node );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Shorthand for diffing two arrays or node lists of DOM nodes.\n\t *\n\t * @private\n\t * @param {Array.|NodeList} actualDomChildren Actual DOM children\n\t * @param {Array.|NodeList} expectedDomChildren Expected DOM children.\n\t * @returns {Array.} The list of actions based on the {@link module:utils/diff~diff} function.\n\t */\n\t_diffNodeLists( actualDomChildren, expectedDomChildren ) {\n\t\tactualDomChildren = filterOutFakeSelectionContainer( actualDomChildren, this._fakeSelectionContainer );\n\n\t\treturn diff( actualDomChildren, expectedDomChildren, sameNodes.bind( null, this.domConverter ) );\n\t}\n\n\t/**\n\t * Finds DOM nodes that were replaced with the similar nodes (same tag name) in the view. All nodes are compared\n\t * within one `insert`/`delete` action group, for example:\n\t *\n\t * \t\tActual DOM:\t\tFoo BarBaz Bax
\n\t * \t\tExpected DOM:\tBar123 Baz 456
\n\t * \t\tInput actions:\t[ insert, insert, delete, delete, equal, insert, delete ]\n\t * \t\tOutput actions:\t[ insert, replace, delete, equal, replace ]\n\t *\n\t * @private\n\t * @param {Array.} actions Actions array which is a result of the {@link module:utils/diff~diff} function.\n\t * @param {Array.|NodeList} actualDom Actual DOM children\n\t * @param {Array.} expectedDom Expected DOM children.\n\t * @returns {Array.} Actions array modified with the `replace` actions.\n\t */\n\t_findReplaceActions( actions, actualDom, expectedDom ) {\n\t\t// If there is no both 'insert' and 'delete' actions, no need to check for replaced elements.\n\t\tif ( actions.indexOf( 'insert' ) === -1 || actions.indexOf( 'delete' ) === -1 ) {\n\t\t\treturn actions;\n\t\t}\n\n\t\tlet newActions = [];\n\t\tlet actualSlice = [];\n\t\tlet expectedSlice = [];\n\n\t\tconst counter = { equal: 0, insert: 0, delete: 0 };\n\n\t\tfor ( const action of actions ) {\n\t\t\tif ( action === 'insert' ) {\n\t\t\t\texpectedSlice.push( expectedDom[ counter.equal + counter.insert ] );\n\t\t\t} else if ( action === 'delete' ) {\n\t\t\t\tactualSlice.push( actualDom[ counter.equal + counter.delete ] );\n\t\t\t} else { // equal\n\t\t\t\tnewActions = newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );\n\t\t\t\tnewActions.push( 'equal' );\n\t\t\t\t// Reset stored elements on 'equal'.\n\t\t\t\tactualSlice = [];\n\t\t\t\texpectedSlice = [];\n\t\t\t}\n\t\t\tcounter[ action ]++;\n\t\t}\n\n\t\treturn newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );\n\t}\n\n\t/**\n\t * Marks text nodes to be synchronized.\n\t *\n\t * If a text node is passed, it will be marked. If an element is passed, all descendant text nodes inside it will be marked.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewNode View node to sync.\n\t */\n\t_markDescendantTextToSync( viewNode ) {\n\t\tif ( !viewNode ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( viewNode.is( '$text' ) ) {\n\t\t\tthis.markedTexts.add( viewNode );\n\t\t} else if ( viewNode.is( 'element' ) ) {\n\t\t\tfor ( const child of viewNode.getChildren() ) {\n\t\t\t\tthis._markDescendantTextToSync( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if the selection needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t */\n\t_updateSelection() {\n\t\t// If there is no selection - remove DOM and fake selections.\n\t\tif ( this.selection.rangeCount === 0 ) {\n\t\t\tthis._removeDomSelection();\n\t\t\tthis._removeFakeSelection();\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst domRoot = this.domConverter.mapViewToDom( this.selection.editableElement );\n\n\t\t// Do nothing if there is no focus, or there is no DOM element corresponding to selection's editable element.\n\t\tif ( !this.isFocused || !domRoot ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Render selection.\n\t\tif ( this.selection.isFake ) {\n\t\t\tthis._updateFakeSelection( domRoot );\n\t\t} else {\n\t\t\tthis._removeFakeSelection();\n\t\t\tthis._updateDomSelection( domRoot );\n\t\t}\n\t}\n\n\t/**\n\t * Updates the fake selection.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where the fake selection container should be added.\n\t */\n\t_updateFakeSelection( domRoot ) {\n\t\tconst domDocument = domRoot.ownerDocument;\n\n\t\tif ( !this._fakeSelectionContainer ) {\n\t\t\tthis._fakeSelectionContainer = createFakeSelectionContainer( domDocument );\n\t\t}\n\n\t\tconst container = this._fakeSelectionContainer;\n\n\t\t// Bind fake selection container with the current selection *position*.\n\t\tthis.domConverter.bindFakeSelection( container, this.selection );\n\n\t\tif ( !this._fakeSelectionNeedsUpdate( domRoot ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !container.parentElement || container.parentElement != domRoot ) {\n\t\t\tdomRoot.appendChild( container );\n\t\t}\n\n\t\tcontainer.textContent = this.selection.fakeSelectionLabel || '\\u00A0';\n\n\t\tconst domSelection = domDocument.getSelection();\n\t\tconst domRange = domDocument.createRange();\n\n\t\tdomSelection.removeAllRanges();\n\t\tdomRange.selectNodeContents( container );\n\t\tdomSelection.addRange( domRange );\n\t}\n\n\t/**\n\t * Updates the DOM selection.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where the DOM selection should be rendered.\n\t */\n\t_updateDomSelection( domRoot ) {\n\t\tconst domSelection = domRoot.ownerDocument.defaultView.getSelection();\n\n\t\t// Let's check whether DOM selection needs updating at all.\n\t\tif ( !this._domSelectionNeedsUpdate( domSelection ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Multi-range selection is not available in most browsers, and, at least in Chrome, trying to\n\t\t// set such selection, that is not continuous, throws an error. Because of that, we will just use anchor\n\t\t// and focus of view selection.\n\t\t// Since we are not supporting multi-range selection, we also do not need to check if proper editable is\n\t\t// selected. If there is any editable selected, it is okay (editable is taken from selection anchor).\n\t\tconst anchor = this.domConverter.viewPositionToDom( this.selection.anchor );\n\t\tconst focus = this.domConverter.viewPositionToDom( this.selection.focus );\n\n\t\t// Focus the new editing host.\n\t\t// Otherwise, FF may throw an error (https://github.com/ckeditor/ckeditor5/issues/721).\n\t\tdomRoot.focus();\n\n\t\tdomSelection.collapse( anchor.parent, anchor.offset );\n\t\tdomSelection.extend( focus.parent, focus.offset );\n\n\t\t// Firefox–specific hack (https://github.com/ckeditor/ckeditor5-engine/issues/1439).\n\t\tif ( env.isGecko ) {\n\t\t\tfixGeckoSelectionAfterBr( focus, domSelection );\n\t\t}\n\t}\n\n\t/**\n\t * Checks whether a given DOM selection needs to be updated.\n\t *\n\t * @private\n\t * @param {Selection} domSelection The DOM selection to check.\n\t * @returns {Boolean}\n\t */\n\t_domSelectionNeedsUpdate( domSelection ) {\n\t\tif ( !this.domConverter.isDomSelectionCorrect( domSelection ) ) {\n\t\t\t// Current DOM selection is in incorrect position. We need to update it.\n\t\t\treturn true;\n\t\t}\n\n\t\tconst oldViewSelection = domSelection && this.domConverter.domSelectionToView( domSelection );\n\n\t\tif ( oldViewSelection && this.selection.isEqual( oldViewSelection ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If selection is not collapsed, it does not need to be updated if it is similar.\n\t\tif ( !this.selection.isCollapsed && this.selection.isSimilar( oldViewSelection ) ) {\n\t\t\t// Selection did not changed and is correct, do not update.\n\t\t\treturn false;\n\t\t}\n\n\t\t// Selections are not similar.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether the fake selection needs to be updated.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where a new fake selection container should be added.\n\t * @returns {Boolean}\n\t */\n\t_fakeSelectionNeedsUpdate( domRoot ) {\n\t\tconst container = this._fakeSelectionContainer;\n\t\tconst domSelection = domRoot.ownerDocument.getSelection();\n\n\t\t// Fake selection needs to be updated if there's no fake selection container, or the container currently sits\n\t\t// in a different root.\n\t\tif ( !container || container.parentElement !== domRoot ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Make sure that the selection actually is within the fake selection.\n\t\tif ( domSelection.anchorNode !== container && !container.contains( domSelection.anchorNode ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn container.textContent !== this.selection.fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Removes the DOM selection.\n\t *\n\t * @private\n\t */\n\t_removeDomSelection() {\n\t\tfor ( const doc of this.domDocuments ) {\n\t\t\tconst domSelection = doc.getSelection();\n\n\t\t\tif ( domSelection.rangeCount ) {\n\t\t\t\tconst activeDomElement = doc.activeElement;\n\t\t\t\tconst viewElement = this.domConverter.mapDomToView( activeDomElement );\n\n\t\t\t\tif ( activeDomElement && viewElement ) {\n\t\t\t\t\tdoc.getSelection().removeAllRanges();\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Removes the fake selection.\n\t *\n\t * @private\n\t */\n\t_removeFakeSelection() {\n\t\tconst container = this._fakeSelectionContainer;\n\n\t\tif ( container ) {\n\t\t\tcontainer.remove();\n\t\t}\n\t}\n\n\t/**\n\t * Checks if focus needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t */\n\t_updateFocus() {\n\t\tif ( this.isFocused ) {\n\t\t\tconst editable = this.selection.editableElement;\n\n\t\t\tif ( editable ) {\n\t\t\t\tthis.domConverter.focus( editable );\n\t\t\t}\n\t\t}\n\t}\n}\n\nmix( Renderer, ObservableMixin );\n\n// Checks if provided element is editable.\n//\n// @private\n// @param {module:engine/view/element~Element} element\n// @returns {Boolean}\nfunction isEditable( element ) {\n\tif ( element.getAttribute( 'contenteditable' ) == 'false' ) {\n\t\treturn false;\n\t}\n\n\tconst parent = element.findAncestor( element => element.hasAttribute( 'contenteditable' ) );\n\n\treturn !parent || parent.getAttribute( 'contenteditable' ) == 'true';\n}\n\n// Adds inline filler at a given position.\n//\n// The position can be given as an array of DOM nodes and an offset in that array,\n// or a DOM parent element and an offset in that element.\n//\n// @private\n// @param {Document} domDocument\n// @param {Element|Array.} domParentOrArray\n// @param {Number} offset\n// @returns {Text} The DOM text node that contains an inline filler.\nfunction addInlineFiller( domDocument, domParentOrArray, offset ) {\n\tconst childNodes = domParentOrArray instanceof Array ? domParentOrArray : domParentOrArray.childNodes;\n\tconst nodeAfterFiller = childNodes[ offset ];\n\n\tif ( isText( nodeAfterFiller ) ) {\n\t\tnodeAfterFiller.data = INLINE_FILLER + nodeAfterFiller.data;\n\n\t\treturn nodeAfterFiller;\n\t} else {\n\t\tconst fillerNode = domDocument.createTextNode( INLINE_FILLER );\n\n\t\tif ( Array.isArray( domParentOrArray ) ) {\n\t\t\tchildNodes.splice( offset, 0, fillerNode );\n\t\t} else {\n\t\t\tinsertAt( domParentOrArray, offset, fillerNode );\n\t\t}\n\n\t\treturn fillerNode;\n\t}\n}\n\n// Whether two DOM nodes should be considered as similar.\n// Nodes are considered similar if they have the same tag name.\n//\n// @private\n// @param {Node} node1\n// @param {Node} node2\n// @returns {Boolean}\nfunction areSimilar( node1, node2 ) {\n\treturn isNode( node1 ) && isNode( node2 ) &&\n\t\t!isText( node1 ) && !isText( node2 ) &&\n\t\tnode1.nodeType !== Node.COMMENT_NODE && node2.nodeType !== Node.COMMENT_NODE &&\n\t\tnode1.tagName.toLowerCase() === node2.tagName.toLowerCase();\n}\n\n// Whether two dom nodes should be considered as the same.\n// Two nodes which are considered the same are:\n//\n//\t\t* Text nodes with the same text.\n//\t\t* Element nodes represented by the same object.\n//\t\t* Two block filler elements.\n//\n// @private\n// @param {String} blockFillerMode Block filler mode, see {@link module:engine/view/domconverter~DomConverter#blockFillerMode}.\n// @param {Node} node1\n// @param {Node} node2\n// @returns {Boolean}\nfunction sameNodes( domConverter, actualDomChild, expectedDomChild ) {\n\t// Elements.\n\tif ( actualDomChild === expectedDomChild ) {\n\t\treturn true;\n\t}\n\t// Texts.\n\telse if ( isText( actualDomChild ) && isText( expectedDomChild ) ) {\n\t\treturn actualDomChild.data === expectedDomChild.data;\n\t}\n\t// Block fillers.\n\telse if ( domConverter.isBlockFiller( actualDomChild ) &&\n\t\tdomConverter.isBlockFiller( expectedDomChild ) ) {\n\t\treturn true;\n\t}\n\n\t// Not matching types.\n\treturn false;\n}\n\n// The following is a Firefox–specific hack (https://github.com/ckeditor/ckeditor5-engine/issues/1439).\n// When the native DOM selection is at the end of the block and preceded by e.g.\n//\n//\t\tfoo []
\n//\n// which happens a lot when using the soft line break, the browser fails to (visually) move the\n// caret to the new line. A quick fix is as simple as force–refreshing the selection with the same range.\nfunction fixGeckoSelectionAfterBr( focus, domSelection ) {\n\tconst parent = focus.parent;\n\n\t// This fix works only when the focus point is at the very end of an element.\n\t// There is no point in running it in cases unrelated to the browser bug.\n\tif ( parent.nodeType != Node.ELEMENT_NODE || focus.offset != parent.childNodes.length - 1 ) {\n\t\treturn;\n\t}\n\n\tconst childAtOffset = parent.childNodes[ focus.offset ];\n\n\t// To stay on the safe side, the fix being as specific as possible, it targets only the\n\t// selection which is at the very end of the element and preceded by .\n\tif ( childAtOffset && childAtOffset.tagName == 'BR' ) {\n\t\tdomSelection.addRange( domSelection.getRangeAt( 0 ) );\n\t}\n}\n\nfunction filterOutFakeSelectionContainer( domChildList, fakeSelectionContainer ) {\n\tconst childList = Array.from( domChildList );\n\n\tif ( childList.length == 0 || !fakeSelectionContainer ) {\n\t\treturn childList;\n\t}\n\n\tconst last = childList[ childList.length - 1 ];\n\n\tif ( last == fakeSelectionContainer ) {\n\t\tchildList.pop();\n\t}\n\n\treturn childList;\n}\n\n// Creates a fake selection container for a given document.\n//\n// @private\n// @param {Document} domDocument\n// @returns {HTMLElement}\nfunction createFakeSelectionContainer( domDocument ) {\n\tconst container = domDocument.createElement( 'div' );\n\n\tObject.assign( container.style, {\n\t\tposition: 'fixed',\n\t\ttop: 0,\n\t\tleft: '-9999px',\n\t\t// See https://github.com/ckeditor/ckeditor5/issues/752.\n\t\twidth: '42px'\n\t} );\n\n\t// Fill it with a text node so we can update it later.\n\tcontainer.textContent = '\\u00A0';\n\n\treturn container;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals window, document */\n\n/**\n * @module utils/dom/global\n */\n\n/**\n * A helper (module) giving an access to the global DOM objects such as `window` and\n * `document`. Accessing these objects using this helper allows easy and bulletproof\n * testing, i.e. stubbing native properties:\n *\n *\t\timport global from 'ckeditor5/utils/dom/global.js';\n *\n *\t\t// This stub will work for any code using global module.\n *\t\ttestUtils.sinon.stub( global, 'window', {\n *\t\t\tinnerWidth: 10000\n *\t\t} );\n *\n *\t\tconsole.log( global.window.innerWidth );\n */\nexport default { window, document };\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/indexof\n */\n\n/**\n * Returns index of the node in the parent element.\n *\n * @param {Node} node Node which index is tested.\n * @returns {Number} Index of the node in the parent element. Returns 0 if node has no parent.\n */\nexport default function indexOf( node ) {\n\tlet index = 0;\n\n\twhile ( node.previousSibling ) {\n\t\tnode = node.previousSibling;\n\t\tindex++;\n\t}\n\n\treturn index;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals Node */\n\n/**\n * @module utils/dom/getancestors\n */\n\n/**\n * Returns all ancestors of given DOM node, starting from the top-most (root). Includes the given node itself. If the\n * node is a part of `DocumentFragment` that `DocumentFragment` will be returned. In contrary, if the node is\n * appended to a `Document`, that `Document` will not be returned (algorithms operating on DOM tree care for `Document#documentElement`\n * at most, which will be returned).\n *\n * @param {Node} node DOM node.\n * @returns {Array.} Array of given `node` parents.\n */\nexport default function getAncestors( node ) {\n\tconst nodes = [];\n\n\t// We are interested in `Node`s `DocumentFragment`s only.\n\twhile ( node && node.nodeType != Node.DOCUMENT_NODE ) {\n\t\tnodes.unshift( node );\n\t\tnode = node.parentNode;\n\t}\n\n\treturn nodes;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/domconverter\n */\n\n/* globals document, Node, NodeFilter, Text */\n\nimport ViewText from './text';\nimport ViewElement from './element';\nimport ViewPosition from './position';\nimport ViewRange from './range';\nimport ViewSelection from './selection';\nimport ViewDocumentFragment from './documentfragment';\nimport ViewTreeWalker from './treewalker';\nimport { BR_FILLER, getDataWithoutFiller, INLINE_FILLER_LENGTH, isInlineFiller, NBSP_FILLER, startsWithFiller } from './filler';\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\nimport indexOf from '@ckeditor/ckeditor5-utils/src/dom/indexof';\nimport getAncestors from '@ckeditor/ckeditor5-utils/src/dom/getancestors';\nimport getCommonAncestor from '@ckeditor/ckeditor5-utils/src/dom/getcommonancestor';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\nimport { isElement } from 'lodash-es';\n\n// eslint-disable-next-line new-cap\nconst BR_FILLER_REF = BR_FILLER( document );\n\n/**\n * `DomConverter` is a set of tools to do transformations between DOM nodes and view nodes. It also handles\n * {@link module:engine/view/domconverter~DomConverter#bindElements bindings} between these nodes.\n *\n * An instance of the DOM converter is available under\n * {@link module:engine/view/view~View#domConverter `editor.editing.view.domConverter`}.\n *\n * The DOM converter does not check which nodes should be rendered (use {@link module:engine/view/renderer~Renderer}), does not keep the\n * state of a tree nor keeps the synchronization between the tree view and the DOM tree (use {@link module:engine/view/document~Document}).\n *\n * The DOM converter keeps DOM elements to view element bindings, so when the converter gets destroyed, the bindings are lost.\n * Two converters will keep separate binding maps, so one tree view can be bound with two DOM trees.\n */\nexport default class DomConverter {\n\t/**\n\t * Creates a DOM converter.\n\t *\n\t * @param {module:engine/view/document~Document} document The view document instance.\n\t * @param {Object} options An object with configuration options.\n\t * @param {module:engine/view/filler~BlockFillerMode} [options.blockFillerMode='br'] The type of the block filler to use.\n\t */\n\tconstructor( document, options = {} ) {\n\t\t/**\n\t\t * @readonly\n\t\t * @type {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = document;\n\n\t\t/**\n\t\t * The mode of a block filler used by the DOM converter.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'br'|'nbsp'} module:engine/view/domconverter~DomConverter#blockFillerMode\n\t\t */\n\t\tthis.blockFillerMode = options.blockFillerMode || 'br';\n\n\t\t/**\n\t\t * Elements which are considered pre-formatted elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.} module:engine/view/domconverter~DomConverter#preElements\n\t\t */\n\t\tthis.preElements = [ 'pre' ];\n\n\t\t/**\n\t\t * Elements which are considered block elements (and hence should be filled with a\n\t\t * {@link #isBlockFiller block filler}).\n\t\t *\n\t\t * Whether an element is considered a block element also affects handling of trailing whitespaces.\n\t\t *\n\t\t * You can extend this array if you introduce support for block elements which are not yet recognized here.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.} module:engine/view/domconverter~DomConverter#blockElements\n\t\t */\n\t\tthis.blockElements = [ 'p', 'div', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'li', 'dd', 'dt', 'figcaption', 'td', 'th' ];\n\n\t\t/**\n\t\t * Block {@link module:engine/view/filler filler} creator, which is used to create all block fillers during the\n\t\t * view-to-DOM conversion and to recognize block fillers during the DOM-to-view conversion.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {Function} module:engine/view/domconverter~DomConverter#_blockFiller\n\t\t */\n\t\tthis._blockFiller = this.blockFillerMode == 'br' ? BR_FILLER : NBSP_FILLER;\n\n\t\t/**\n\t\t * The DOM-to-view mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_domToViewMapping\n\t\t */\n\t\tthis._domToViewMapping = new WeakMap();\n\n\t\t/**\n\t\t * The view-to-DOM mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_viewToDomMapping\n\t\t */\n\t\tthis._viewToDomMapping = new WeakMap();\n\n\t\t/**\n\t\t * Holds the mapping between fake selection containers and corresponding view selections.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_fakeSelectionMapping\n\t\t */\n\t\tthis._fakeSelectionMapping = new WeakMap();\n\t}\n\n\t/**\n\t * Binds given DOM element that represents fake selection to a **position** of a\n\t * {@link module:engine/view/documentselection~DocumentSelection document selection}.\n\t * Document selection copy is stored and can be retrieved by\n\t * {@link module:engine/view/domconverter~DomConverter#fakeSelectionToView} method.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @param {module:engine/view/documentselection~DocumentSelection} viewDocumentSelection\n\t */\n\tbindFakeSelection( domElement, viewDocumentSelection ) {\n\t\tthis._fakeSelectionMapping.set( domElement, new ViewSelection( viewDocumentSelection ) );\n\t}\n\n\t/**\n\t * Returns {@link module:engine/view/selection~Selection view selection} instance corresponding to\n\t * given DOM element that represents fake selection. Returns `undefined` if binding to given DOM element does not exists.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @returns {module:engine/view/selection~Selection|undefined}\n\t */\n\tfakeSelectionToView( domElement ) {\n\t\treturn this._fakeSelectionMapping.get( domElement );\n\t}\n\n\t/**\n\t * Binds DOM and View elements, so it will be possible to get corresponding elements using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {HTMLElement} domElement DOM element to bind.\n\t * @param {module:engine/view/element~Element} viewElement View element to bind.\n\t */\n\tbindElements( domElement, viewElement ) {\n\t\tthis._domToViewMapping.set( domElement, viewElement );\n\t\tthis._viewToDomMapping.set( viewElement, domElement );\n\t}\n\n\t/**\n\t * Unbinds given `domElement` from the view element it was bound to. Unbinding is deep, meaning that all children of\n\t * `domElement` will be unbound too.\n\t *\n\t * @param {HTMLElement} domElement DOM element to unbind.\n\t */\n\tunbindDomElement( domElement ) {\n\t\tconst viewElement = this._domToViewMapping.get( domElement );\n\n\t\tif ( viewElement ) {\n\t\t\tthis._domToViewMapping.delete( domElement );\n\t\t\tthis._viewToDomMapping.delete( viewElement );\n\n\t\t\tfor ( const child of domElement.childNodes ) {\n\t\t\t\tthis.unbindDomElement( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Binds DOM and View document fragments, so it will be possible to get corresponding document fragments using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {DocumentFragment} domFragment DOM document fragment to bind.\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment View document fragment to bind.\n\t */\n\tbindDocumentFragments( domFragment, viewFragment ) {\n\t\tthis._domToViewMapping.set( domFragment, viewFragment );\n\t\tthis._viewToDomMapping.set( viewFragment, domFragment );\n\t}\n\n\t/**\n\t * Converts view to DOM. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View node or document fragment to transform.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @returns {Node|DocumentFragment} Converted node or DocumentFragment.\n\t */\n\tviewToDom( viewNode, domDocument, options = {} ) {\n\t\tif ( viewNode.is( '$text' ) ) {\n\t\t\tconst textData = this._processDataFromViewText( viewNode );\n\n\t\t\treturn domDocument.createTextNode( textData );\n\t\t} else {\n\t\t\tif ( this.mapViewToDom( viewNode ) ) {\n\t\t\t\treturn this.mapViewToDom( viewNode );\n\t\t\t}\n\n\t\t\tlet domElement;\n\n\t\t\tif ( viewNode.is( 'documentFragment' ) ) {\n\t\t\t\t// Create DOM document fragment.\n\t\t\t\tdomElement = domDocument.createDocumentFragment();\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domElement, viewNode );\n\t\t\t\t}\n\t\t\t} else if ( viewNode.is( 'uiElement' ) ) {\n\t\t\t\t// UIElement has its own render() method (see #799).\n\t\t\t\tdomElement = viewNode.render( domDocument );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\treturn domElement;\n\t\t\t} else {\n\t\t\t\t// Create DOM element.\n\t\t\t\tif ( viewNode.hasAttribute( 'xmlns' ) ) {\n\t\t\t\t\tdomElement = domDocument.createElementNS( viewNode.getAttribute( 'xmlns' ), viewNode.name );\n\t\t\t\t} else {\n\t\t\t\t\tdomElement = domDocument.createElement( viewNode.name );\n\t\t\t\t}\n\n\t\t\t\t// RawElement take care of their children in RawElement#render() method which can be customized\n\t\t\t\t// (see https://github.com/ckeditor/ckeditor5/issues/4469).\n\t\t\t\tif ( viewNode.is( 'rawElement' ) ) {\n\t\t\t\t\tviewNode.render( domElement );\n\t\t\t\t}\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tfor ( const key of viewNode.getAttributeKeys() ) {\n\t\t\t\t\tdomElement.setAttribute( key, viewNode.getAttribute( key ) );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren || options.withChildren === undefined ) {\n\t\t\t\tfor ( const child of this.viewChildrenToDom( viewNode, domDocument, options ) ) {\n\t\t\t\t\tdomElement.appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn domElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the view element to DOM using the\n\t * {@link module:engine/view/domconverter~DomConverter#viewToDom} method.\n\t * Additionally, this method adds block {@link module:engine/view/filler filler} to the list of children, if needed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewElement Parent view element.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#viewToDom} options parameter.\n\t * @returns {Iterable.} DOM nodes.\n\t */\n\t* viewChildrenToDom( viewElement, domDocument, options = {} ) {\n\t\tconst fillerPositionOffset = viewElement.getFillerOffset && viewElement.getFillerOffset();\n\t\tlet offset = 0;\n\n\t\tfor ( const childView of viewElement.getChildren() ) {\n\t\t\tif ( fillerPositionOffset === offset ) {\n\t\t\t\tyield this._blockFiller( domDocument );\n\t\t\t}\n\n\t\t\tyield this.viewToDom( childView, domDocument, options );\n\n\t\t\toffset++;\n\t\t}\n\n\t\tif ( fillerPositionOffset === offset ) {\n\t\t\tyield this._blockFiller( domDocument );\n\t\t}\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/range~Range} to DOM range.\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t *\n\t * @param {module:engine/view/range~Range} viewRange View range.\n\t * @returns {Range} DOM range.\n\t */\n\tviewRangeToDom( viewRange ) {\n\t\tconst domStart = this.viewPositionToDom( viewRange.start );\n\t\tconst domEnd = this.viewPositionToDom( viewRange.end );\n\n\t\tconst domRange = document.createRange();\n\t\tdomRange.setStart( domStart.parent, domStart.offset );\n\t\tdomRange.setEnd( domEnd.parent, domEnd.offset );\n\n\t\treturn domRange;\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/position~Position} to DOM parent and offset.\n\t *\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t * If the converted position is directly before inline filler it is moved inside the filler.\n\t *\n\t * @param {module:engine/view/position~Position} viewPosition View position.\n\t * @returns {Object|null} position DOM position or `null` if view position could not be converted to DOM.\n\t * @returns {Node} position.parent DOM position parent.\n\t * @returns {Number} position.offset DOM position offset.\n\t */\n\tviewPositionToDom( viewPosition ) {\n\t\tconst viewParent = viewPosition.parent;\n\n\t\tif ( viewParent.is( '$text' ) ) {\n\t\t\tconst domParent = this.findCorrespondingDomText( viewParent );\n\n\t\t\tif ( !domParent ) {\n\t\t\t\t// Position is in a view text node that has not been rendered to DOM yet.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tlet offset = viewPosition.offset;\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset += INLINE_FILLER_LENGTH;\n\t\t\t}\n\n\t\t\treturn { parent: domParent, offset };\n\t\t} else {\n\t\t\t// viewParent is instance of ViewElement.\n\t\t\tlet domParent, domBefore, domAfter;\n\n\t\t\tif ( viewPosition.offset === 0 ) {\n\t\t\t\tdomParent = this.mapViewToDom( viewParent );\n\n\t\t\t\tif ( !domParent ) {\n\t\t\t\t\t// Position is in a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomAfter = domParent.childNodes[ 0 ];\n\t\t\t} else {\n\t\t\t\tconst nodeBefore = viewPosition.nodeBefore;\n\n\t\t\t\tdomBefore = nodeBefore.is( '$text' ) ?\n\t\t\t\t\tthis.findCorrespondingDomText( nodeBefore ) :\n\t\t\t\t\tthis.mapViewToDom( viewPosition.nodeBefore );\n\n\t\t\t\tif ( !domBefore ) {\n\t\t\t\t\t// Position is after a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomParent = domBefore.parentNode;\n\t\t\t\tdomAfter = domBefore.nextSibling;\n\t\t\t}\n\n\t\t\t// If there is an inline filler at position return position inside the filler. We should never return\n\t\t\t// the position before the inline filler.\n\t\t\tif ( isText( domAfter ) && startsWithFiller( domAfter ) ) {\n\t\t\t\treturn { parent: domAfter, offset: INLINE_FILLER_LENGTH };\n\t\t\t}\n\n\t\t\tconst offset = domBefore ? indexOf( domBefore ) + 1 : 0;\n\n\t\t\treturn { parent: domParent, offset };\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM to view. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items. For\n\t * {@link module:engine/view/filler fillers} `null` will be returned.\n\t * For all DOM elements rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * @param {Node|DocumentFragment} domNode DOM node or document fragment to transform.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @param {Boolean} [options.keepOriginalCase=false] If `false`, node's tag name will be converter to lower case.\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null} Converted node or document fragment\n\t * or `null` if DOM node is a {@link module:engine/view/filler filler} or the given node is an empty text node.\n\t */\n\tdomToView( domNode, options = {} ) {\n\t\tif ( this.isBlockFiller( domNode, this.blockFillerMode ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// When node is inside a UIElement or a RawElement return that parent as it's view representation.\n\t\tconst hostElement = this.getHostViewElement( domNode, this._domToViewMapping );\n\n\t\tif ( hostElement ) {\n\t\t\treturn hostElement;\n\t\t}\n\n\t\tif ( isText( domNode ) ) {\n\t\t\tif ( isInlineFiller( domNode ) ) {\n\t\t\t\treturn null;\n\t\t\t} else {\n\t\t\t\tconst textData = this._processDataFromDomText( domNode );\n\n\t\t\t\treturn textData === '' ? null : new ViewText( this.document, textData );\n\t\t\t}\n\t\t} else if ( this.isComment( domNode ) ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\tif ( this.mapDomToView( domNode ) ) {\n\t\t\t\treturn this.mapDomToView( domNode );\n\t\t\t}\n\n\t\t\tlet viewElement;\n\n\t\t\tif ( this.isDocumentFragment( domNode ) ) {\n\t\t\t\t// Create view document fragment.\n\t\t\t\tviewElement = new ViewDocumentFragment( this.document );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domNode, viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Create view element.\n\t\t\t\tconst viewName = options.keepOriginalCase ? domNode.tagName : domNode.tagName.toLowerCase();\n\t\t\t\tviewElement = new ViewElement( this.document, viewName );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domNode, viewElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tconst attrs = domNode.attributes;\n\n\t\t\t\tfor ( let i = attrs.length - 1; i >= 0; i-- ) {\n\t\t\t\t\tviewElement._setAttribute( attrs[ i ].name, attrs[ i ].value );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren || options.withChildren === undefined ) {\n\t\t\t\tfor ( const child of this.domChildrenToView( domNode, options ) ) {\n\t\t\t\t\tviewElement._appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn viewElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the DOM element to view nodes using\n\t * the {@link module:engine/view/domconverter~DomConverter#domToView} method.\n\t * Additionally this method omits block {@link module:engine/view/filler filler}, if it exists in the DOM parent.\n\t *\n\t * @param {HTMLElement} domElement Parent DOM element.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#domToView} options parameter.\n\t * @returns {Iterable.} View nodes.\n\t */\n\t* domChildrenToView( domElement, options = {} ) {\n\t\tfor ( let i = 0; i < domElement.childNodes.length; i++ ) {\n\t\t\tconst domChild = domElement.childNodes[ i ];\n\t\t\tconst viewChild = this.domToView( domChild, options );\n\n\t\t\tif ( viewChild !== null ) {\n\t\t\t\tyield viewChild;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM selection to view {@link module:engine/view/selection~Selection}.\n\t * Ranges which cannot be converted will be omitted.\n\t *\n\t * @param {Selection} domSelection DOM selection.\n\t * @returns {module:engine/view/selection~Selection} View selection.\n\t */\n\tdomSelectionToView( domSelection ) {\n\t\t// DOM selection might be placed in fake selection container.\n\t\t// If container contains fake selection - return corresponding view selection.\n\t\tif ( domSelection.rangeCount === 1 ) {\n\t\t\tlet container = domSelection.getRangeAt( 0 ).startContainer;\n\n\t\t\t// The DOM selection might be moved to the text node inside the fake selection container.\n\t\t\tif ( isText( container ) ) {\n\t\t\t\tcontainer = container.parentNode;\n\t\t\t}\n\n\t\t\tconst viewSelection = this.fakeSelectionToView( container );\n\n\t\t\tif ( viewSelection ) {\n\t\t\t\treturn viewSelection;\n\t\t\t}\n\t\t}\n\n\t\tconst isBackward = this.isDomSelectionBackward( domSelection );\n\n\t\tconst viewRanges = [];\n\n\t\tfor ( let i = 0; i < domSelection.rangeCount; i++ ) {\n\t\t\t// DOM Range have correct start and end, no matter what is the DOM Selection direction. So we don't have to fix anything.\n\t\t\tconst domRange = domSelection.getRangeAt( i );\n\t\t\tconst viewRange = this.domRangeToView( domRange );\n\n\t\t\tif ( viewRange ) {\n\t\t\t\tviewRanges.push( viewRange );\n\t\t\t}\n\t\t}\n\n\t\treturn new ViewSelection( viewRanges, { backward: isBackward } );\n\t}\n\n\t/**\n\t * Converts DOM Range to view {@link module:engine/view/range~Range}.\n\t * If the start or end position can not be converted `null` is returned.\n\t *\n\t * @param {Range} domRange DOM range.\n\t * @returns {module:engine/view/range~Range|null} View range.\n\t */\n\tdomRangeToView( domRange ) {\n\t\tconst viewStart = this.domPositionToView( domRange.startContainer, domRange.startOffset );\n\t\tconst viewEnd = this.domPositionToView( domRange.endContainer, domRange.endOffset );\n\n\t\tif ( viewStart && viewEnd ) {\n\t\t\treturn new ViewRange( viewStart, viewEnd );\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Converts DOM parent and offset to view {@link module:engine/view/position~Position}.\n\t *\n\t * If the position is inside a {@link module:engine/view/filler filler} which has no corresponding view node,\n\t * position of the filler will be converted and returned.\n\t *\n\t * If the position is inside DOM element rendered by {@link module:engine/view/uielement~UIElement}\n\t * that position will be converted to view position before that UIElement.\n\t *\n\t * If structures are too different and it is not possible to find corresponding position then `null` will be returned.\n\t *\n\t * @param {Node} domParent DOM position parent.\n\t * @param {Number} domOffset DOM position offset.\n\t * @returns {module:engine/view/position~Position} viewPosition View position.\n\t */\n\tdomPositionToView( domParent, domOffset ) {\n\t\tif ( this.isBlockFiller( domParent, this.blockFillerMode ) ) {\n\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t}\n\n\t\t// If position is somewhere inside UIElement or a RawElement - return position before that element.\n\t\tconst viewElement = this.mapDomToView( domParent );\n\n\t\tif ( viewElement && ( viewElement.is( 'uiElement' ) || viewElement.is( 'rawElement' ) ) ) {\n\t\t\treturn ViewPosition._createBefore( viewElement );\n\t\t}\n\n\t\tif ( isText( domParent ) ) {\n\t\t\tif ( isInlineFiller( domParent ) ) {\n\t\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t\t}\n\n\t\t\tconst viewParent = this.findCorrespondingViewText( domParent );\n\t\t\tlet offset = domOffset;\n\n\t\t\tif ( !viewParent ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset -= INLINE_FILLER_LENGTH;\n\t\t\t\toffset = offset < 0 ? 0 : offset;\n\t\t\t}\n\n\t\t\treturn new ViewPosition( viewParent, offset );\n\t\t}\n\t\t// domParent instanceof HTMLElement.\n\t\telse {\n\t\t\tif ( domOffset === 0 ) {\n\t\t\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t\t\tif ( viewParent ) {\n\t\t\t\t\treturn new ViewPosition( viewParent, 0 );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tconst domBefore = domParent.childNodes[ domOffset - 1 ];\n\t\t\t\tconst viewBefore = isText( domBefore ) ?\n\t\t\t\t\tthis.findCorrespondingViewText( domBefore ) :\n\t\t\t\t\tthis.mapDomToView( domBefore );\n\n\t\t\t\t// TODO #663\n\t\t\t\tif ( viewBefore && viewBefore.parent ) {\n\t\t\t\t\treturn new ViewPosition( viewBefore.parent, viewBefore.index + 1 );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t/**\n\t * Returns corresponding view {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment} for provided DOM element or\n\t * document fragment. If there is no view item {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * to the given DOM - `undefined` is returned.\n\t *\n\t * For all DOM elements rendered by a {@link module:engine/view/uielement~UIElement} or\n\t * a {@link module:engine/view/rawelement~RawElement}, the parent `UIElement` or `RawElement` will be returned.\n\t *\n\t * @param {DocumentFragment|Element} domElementOrDocumentFragment DOM element or document fragment.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|undefined}\n\t * Corresponding view element, document fragment or `undefined` if no element was bound.\n\t */\n\tmapDomToView( domElementOrDocumentFragment ) {\n\t\tconst hostElement = this.getHostViewElement( domElementOrDocumentFragment );\n\n\t\treturn hostElement || this._domToViewMapping.get( domElementOrDocumentFragment );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * For all text nodes rendered by a {@link module:engine/view/uielement~UIElement} or\n\t * a {@link module:engine/view/rawelement~RawElement}, the parent `UIElement` or `RawElement` will be returned.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * Note that for the block or inline {@link module:engine/view/filler filler} this method returns `null`.\n\t *\n\t * @param {Text} domText DOM text node.\n\t * @returns {module:engine/view/text~Text|null} Corresponding view text node or `null`, if it was not possible to find a\n\t * corresponding node.\n\t */\n\tfindCorrespondingViewText( domText ) {\n\t\tif ( isInlineFiller( domText ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// If DOM text was rendered by a UIElement or a RawElement - return this parent element.\n\t\tconst hostElement = this.getHostViewElement( domText );\n\n\t\tif ( hostElement ) {\n\t\t\treturn hostElement;\n\t\t}\n\n\t\tconst previousSibling = domText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling ) {\n\t\t\tif ( !( this.isElement( previousSibling ) ) ) {\n\t\t\t\t// The previous is text or comment.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tconst viewElement = this.mapDomToView( previousSibling );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst nextSibling = viewElement.nextSibling;\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( nextSibling instanceof ViewText ) {\n\t\t\t\t\treturn viewElement.nextSibling;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t// Try to use parent to find the corresponding text node.\n\t\telse {\n\t\t\tconst viewElement = this.mapDomToView( domText.parentNode );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst firstChild = viewElement.getChild( 0 );\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( firstChild instanceof ViewText ) {\n\t\t\t\t\treturn firstChild;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns corresponding DOM item for provided {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment}.\n\t * To find a corresponding text for {@link module:engine/view/text~Text view Text instance}\n\t * use {@link #findCorrespondingDomText}.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View element or document fragment.\n\t * @returns {Node|DocumentFragment|undefined} Corresponding DOM node or document fragment.\n\t */\n\tmapViewToDom( documentFragmentOrElement ) {\n\t\treturn this._viewToDomMapping.get( documentFragmentOrElement );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} viewText View text node.\n\t * @returns {Text|null} Corresponding DOM text node or `null`, if it was not possible to find a corresponding node.\n\t */\n\tfindCorrespondingDomText( viewText ) {\n\t\tconst previousSibling = viewText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling && this.mapViewToDom( previousSibling ) ) {\n\t\t\treturn this.mapViewToDom( previousSibling ).nextSibling;\n\t\t}\n\n\t\t// If this is a first node, try to use parent to find the corresponding text node.\n\t\tif ( !previousSibling && viewText.parent && this.mapViewToDom( viewText.parent ) ) {\n\t\t\treturn this.mapViewToDom( viewText.parent ).childNodes[ 0 ];\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Focuses DOM editable that is corresponding to provided {@link module:engine/view/editableelement~EditableElement}.\n\t *\n\t * @param {module:engine/view/editableelement~EditableElement} viewEditable\n\t */\n\tfocus( viewEditable ) {\n\t\tconst domEditable = this.mapViewToDom( viewEditable );\n\n\t\tif ( domEditable && domEditable.ownerDocument.activeElement !== domEditable ) {\n\t\t\t// Save the scrollX and scrollY positions before the focus.\n\t\t\tconst { scrollX, scrollY } = global.window;\n\t\t\tconst scrollPositions = [];\n\n\t\t\t// Save all scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst { scrollLeft, scrollTop } = node;\n\n\t\t\t\tscrollPositions.push( [ scrollLeft, scrollTop ] );\n\t\t\t} );\n\n\t\t\tdomEditable.focus();\n\n\t\t\t// Restore scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/957\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst [ scrollLeft, scrollTop ] = scrollPositions.shift();\n\n\t\t\t\tnode.scrollLeft = scrollLeft;\n\t\t\t\tnode.scrollTop = scrollTop;\n\t\t\t} );\n\n\t\t\t// Restore the scrollX and scrollY positions after the focus.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\tglobal.window.scrollTo( scrollX, scrollY );\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.ELEMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisElement( node ) {\n\t\treturn node && node.nodeType == Node.ELEMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.DOCUMENT_FRAGMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisDocumentFragment( node ) {\n\t\treturn node && node.nodeType == Node.DOCUMENT_FRAGMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.COMMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisComment( node ) {\n\t\treturn node && node.nodeType == Node.COMMENT_NODE;\n\t}\n\n\t/**\n\t * Checks if the node is an instance of the block filler for this DOM converter.\n\t *\n\t *\t\tconst converter = new DomConverter( viewDocument, { blockFillerMode: 'br' } );\n\t *\n\t *\t\tconverter.isBlockFiller( BR_FILLER( document ) ); // true\n\t *\t\tconverter.isBlockFiller( NBSP_FILLER( document ) ); // false\n\t *\n\t * **Note:**: For the `'nbsp'` mode the method also checks context of a node so it cannot be a detached node.\n\t *\n\t * **Note:** A special case in the `'nbsp'` mode exists where the ` ` in `
` is treated as a block filler.\n\t *\n\t * @param {Node} domNode DOM node to check.\n\t * @returns {Boolean} True if a node is considered a block filler for given mode.\n\t */\n\tisBlockFiller( domNode ) {\n\t\tif ( this.blockFillerMode == 'br' ) {\n\t\t\treturn domNode.isEqualNode( BR_FILLER_REF );\n\t\t}\n\n\t\t// Special case for
in which case the should be treated as filler even\n\t\t// when we're in the 'nbsp' mode. See ckeditor5#5564.\n\t\tif ( domNode.tagName === 'BR' && hasBlockParent( domNode, this.blockElements ) && domNode.parentNode.childNodes.length === 1 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn isNbspBlockFiller( domNode, this.blockElements );\n\t}\n\n\t/**\n\t * Returns `true` if given selection is a backward selection, that is, if it's `focus` is before `anchor`.\n\t *\n\t * @param {Selection} DOM Selection instance to check.\n\t * @returns {Boolean}\n\t */\n\tisDomSelectionBackward( selection ) {\n\t\tif ( selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Since it takes multiple lines of code to check whether a \"DOM Position\" is before/after another \"DOM Position\",\n\t\t// we will use the fact that range will collapse if it's end is before it's start.\n\t\tconst range = document.createRange();\n\n\t\trange.setStart( selection.anchorNode, selection.anchorOffset );\n\t\trange.setEnd( selection.focusNode, selection.focusOffset );\n\n\t\tconst backward = range.collapsed;\n\n\t\trange.detach();\n\n\t\treturn backward;\n\t}\n\n\t/**\n\t * Returns a parent {@link module:engine/view/uielement~UIElement} or {@link module:engine/view/rawelement~RawElement}\n\t * that hosts the provided DOM node. Returns `null` if there is no such parent.\n\t *\n\t * @param {Node} domNode\n\t * @returns {module:engine/view/uielement~UIElement|module:engine/view/rawelement~RawElement|null}\n\t */\n\tgetHostViewElement( domNode ) {\n\t\tconst ancestors = getAncestors( domNode );\n\n\t\t// Remove domNode from the list.\n\t\tancestors.pop();\n\n\t\twhile ( ancestors.length ) {\n\t\t\tconst domNode = ancestors.pop();\n\t\t\tconst viewNode = this._domToViewMapping.get( domNode );\n\n\t\t\tif ( viewNode && ( viewNode.is( 'uiElement' ) || viewNode.is( 'rawElement' ) ) ) {\n\t\t\t\treturn viewNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks if the given selection's boundaries are at correct places.\n\t *\n\t * The following places are considered as incorrect for selection boundaries:\n\t *\n\t * * before or in the middle of an inline filler sequence,\n\t * * inside a DOM element which represents {@link module:engine/view/uielement~UIElement a view UI element},\n\t * * inside a DOM element which represents {@link module:engine/view/rawelement~RawElement a view raw element}.\n\t *\n\t * @param {Selection} domSelection The DOM selection object to be checked.\n\t * @returns {Boolean} `true` if the given selection is at a correct place, `false` otherwise.\n\t */\n\tisDomSelectionCorrect( domSelection ) {\n\t\treturn this._isDomSelectionPositionCorrect( domSelection.anchorNode, domSelection.anchorOffset ) &&\n\t\t\tthis._isDomSelectionPositionCorrect( domSelection.focusNode, domSelection.focusOffset );\n\t}\n\n\t/**\n\t * Checks if the given DOM position is a correct place for selection boundary. See {@link #isDomSelectionCorrect}.\n\t *\n\t * @private\n\t * @param {Element} domParent Position parent.\n\t * @param {Number} offset Position offset.\n\t * @returns {Boolean} `true` if given position is at a correct place for selection boundary, `false` otherwise.\n\t */\n\t_isDomSelectionPositionCorrect( domParent, offset ) {\n\t\t// If selection is before or in the middle of inline filler string, it is incorrect.\n\t\tif ( isText( domParent ) && startsWithFiller( domParent ) && offset < INLINE_FILLER_LENGTH ) {\n\t\t\t// Selection in a text node, at wrong position (before or in the middle of filler).\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isElement( domParent ) && startsWithFiller( domParent.childNodes[ offset ] ) ) {\n\t\t\t// Selection in an element node, before filler text node.\n\t\t\treturn false;\n\t\t}\n\n\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t// The position is incorrect when anchored inside a UIElement or a RawElement.\n\t\t// Note: In case of UIElement and RawElement, mapDomToView() returns a parent element for any DOM child\n\t\t// so there's no need to perform any additional checks.\n\t\tif ( viewParent && ( viewParent.is( 'uiElement' ) || viewParent.is( 'rawElement' ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Takes text data from a given {@link module:engine/view/text~Text#data} and processes it so\n\t * it is correctly displayed in the DOM.\n\t *\n\t * Following changes are done:\n\t *\n\t * * a space at the beginning is changed to ` ` if this is the first text node in its container\n\t * element or if a previous text node ends with a space character,\n\t * * space at the end of the text node is changed to ` ` if there are two spaces at the end of a node or if next node\n\t * starts with a space or if it is the last text node in its container,\n\t * * remaining spaces are replaced to a chain of spaces and ` ` (e.g. `'x x'` becomes `'x x'`).\n\t *\n\t * Content of {@link #preElements} is not processed.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node View text node to process.\n\t * @returns {String} Processed text data.\n\t */\n\t_processDataFromViewText( node ) {\n\t\tlet data = node.data;\n\n\t\t// If any of node ancestors has a name which is in `preElements` array, then currently processed\n\t\t// view text node is (will be) in preformatted element. We should not change whitespaces then.\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn data;\n\t\t}\n\n\t\t// 1. Replace the first space with a nbsp if the previous node ends with a space or there is no previous node\n\t\t// (container element boundary).\n\t\tif ( data.charAt( 0 ) == ' ' ) {\n\t\t\tconst prevNode = this._getTouchingViewTextNode( node, false );\n\t\t\tconst prevEndsWithSpace = prevNode && this._nodeEndsWithSpace( prevNode );\n\n\t\t\tif ( prevEndsWithSpace || !prevNode ) {\n\t\t\t\tdata = '\\u00A0' + data.substr( 1 );\n\t\t\t}\n\t\t}\n\n\t\t// 2. Replace the last space with nbsp if there are two spaces at the end or if the next node starts with space or there is no\n\t\t// next node (container element boundary).\n\t\t//\n\t\t// Keep in mind that Firefox prefers $nbsp; before tag, not inside it:\n\t\t//\n\t\t// Foo bar <-- bad.\n\t\t// Foo bar <-- good.\n\t\t//\n\t\t// More here: https://github.com/ckeditor/ckeditor5-engine/issues/1747.\n\t\tif ( data.charAt( data.length - 1 ) == ' ' ) {\n\t\t\tconst nextNode = this._getTouchingViewTextNode( node, true );\n\n\t\t\tif ( data.charAt( data.length - 2 ) == ' ' || !nextNode || nextNode.data.charAt( 0 ) == ' ' ) {\n\t\t\t\tdata = data.substr( 0, data.length - 1 ) + '\\u00A0';\n\t\t\t}\n\t\t}\n\n\t\t// 3. Create space+nbsp pairs.\n\t\treturn data.replace( / {2}/g, ' \\u00A0' );\n\t}\n\n\t/**\n\t * Checks whether given node ends with a space character after changing appropriate space characters to ` `s.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node Node to check.\n\t * @returns {Boolean} `true` if given `node` ends with space, `false` otherwise.\n\t */\n\t_nodeEndsWithSpace( node ) {\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst data = this._processDataFromViewText( node );\n\n\t\treturn data.charAt( data.length - 1 ) == ' ';\n\t}\n\n\t/**\n\t * Takes text data from native `Text` node and processes it to a correct {@link module:engine/view/text~Text view text node} data.\n\t *\n\t * Following changes are done:\n\t *\n\t * * multiple whitespaces are replaced to a single space,\n\t * * space at the beginning of a text node is removed if it is the first text node in its container\n\t * element or if the previous text node ends with a space character,\n\t * * space at the end of the text node is removed if there are two spaces at the end of a node or if next node\n\t * starts with a space or if it is the last text node in its container\n\t * * nbsps are converted to spaces.\n\t *\n\t * @param {Node} node DOM text node to process.\n\t * @returns {String} Processed data.\n\t * @private\n\t */\n\t_processDataFromDomText( node ) {\n\t\tlet data = node.data;\n\n\t\tif ( _hasDomParentOfType( node, this.preElements ) ) {\n\t\t\treturn getDataWithoutFiller( node );\n\t\t}\n\n\t\t// Change all consecutive whitespace characters (from the [ \\n\\t\\r] set –\n\t\t// see https://github.com/ckeditor/ckeditor5-engine/issues/822#issuecomment-311670249) to a single space character.\n\t\t// That's how multiple whitespaces are treated when rendered, so we normalize those whitespaces.\n\t\t// We're replacing 1+ (and not 2+) to also normalize singular \\n\\t\\r characters (#822).\n\t\tdata = data.replace( /[ \\n\\t\\r]{1,}/g, ' ' );\n\n\t\tconst prevNode = this._getTouchingInlineDomNode( node, false );\n\t\tconst nextNode = this._getTouchingInlineDomNode( node, true );\n\n\t\tconst shouldLeftTrim = this._checkShouldLeftTrimDomText( prevNode );\n\t\tconst shouldRightTrim = this._checkShouldRightTrimDomText( node, nextNode );\n\n\t\t// If the previous dom text node does not exist or it ends by whitespace character, remove space character from the beginning\n\t\t// of this text node. Such space character is treated as a whitespace.\n\t\tif ( shouldLeftTrim ) {\n\t\t\tdata = data.replace( /^ /, '' );\n\t\t}\n\n\t\t// If the next text node does not exist remove space character from the end of this text node.\n\t\tif ( shouldRightTrim ) {\n\t\t\tdata = data.replace( / $/, '' );\n\t\t}\n\n\t\t// At the beginning and end of a block element, Firefox inserts normal space + instead of non-breaking space.\n\t\t// This means that the text node starts/end with normal space instead of non-breaking space.\n\t\t// This causes a problem because the normal space would be removed in `.replace` calls above. To prevent that,\n\t\t// the inline filler is removed only after the data is initially processed (by the `.replace` above). See ckeditor5#692.\n\t\tdata = getDataWithoutFiller( new Text( data ) );\n\n\t\t// At this point we should have removed all whitespaces from DOM text data.\n\t\t//\n\t\t// Now, We will reverse the process that happens in `_processDataFromViewText`.\n\t\t//\n\t\t// We have to change chars, that were in DOM text data because of rendering reasons, to spaces.\n\t\t// First, change all ` \\u00A0` pairs (space + ) to two spaces. DOM converter changes two spaces from model/view to\n\t\t// ` \\u00A0` to ensure proper rendering. Since here we convert back, we recognize those pairs and change them back to ` `.\n\t\tdata = data.replace( / \\u00A0/g, ' ' );\n\n\t\t// Then, let's change the last nbsp to a space.\n\t\tif ( /( |\\u00A0)\\u00A0$/.test( data ) || !nextNode || ( nextNode.data && nextNode.data.charAt( 0 ) == ' ' ) ) {\n\t\t\tdata = data.replace( /\\u00A0$/, ' ' );\n\t\t}\n\n\t\t// Then, change character that is at the beginning of the text node to space character.\n\t\t// We do that replacement only if this is the first node or the previous node ends on whitespace character.\n\t\tif ( shouldLeftTrim ) {\n\t\t\tdata = data.replace( /^\\u00A0/, ' ' );\n\t\t}\n\n\t\t// At this point, all whitespaces should be removed and all created for rendering reasons should be\n\t\t// changed to normal space. All left are inserted intentionally.\n\t\treturn data;\n\t}\n\n\t/**\n\t * Helper function which checks if a DOM text node, preceded by the given `prevNode` should\n\t * be trimmed from the left side.\n\t *\n\t * @param {Node} prevNode\n\t */\n\t_checkShouldLeftTrimDomText( prevNode ) {\n\t\tif ( !prevNode ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( isElement( prevNode ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn /[^\\S\\u00A0]/.test( prevNode.data.charAt( prevNode.data.length - 1 ) );\n\t}\n\n\t/**\n\t * Helper function which checks if a DOM text node, succeeded by the given `nextNode` should\n\t * be trimmed from the right side.\n\t *\n\t * @param {Node} node\n\t * @param {Node} nextNode\n\t */\n\t_checkShouldRightTrimDomText( node, nextNode ) {\n\t\tif ( nextNode ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn !startsWithFiller( node );\n\t}\n\n\t/**\n\t * Helper function. For given {@link module:engine/view/text~Text view text node}, it finds previous or next sibling\n\t * that is contained in the same container element. If there is no such sibling, `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} node Reference node.\n\t * @param {Boolean} getNext\n\t * @returns {module:engine/view/text~Text|null} Touching text node or `null` if there is no next or previous touching text node.\n\t */\n\t_getTouchingViewTextNode( node, getNext ) {\n\t\tconst treeWalker = new ViewTreeWalker( {\n\t\t\tstartPosition: getNext ? ViewPosition._createAfter( node ) : ViewPosition._createBefore( node ),\n\t\t\tdirection: getNext ? 'forward' : 'backward'\n\t\t} );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\t// ViewContainerElement is found on a way to next ViewText node, so given `node` was first/last\n\t\t\t// text node in its container element.\n\t\t\tif ( value.item.is( 'containerElement' ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\t// found – it works like a block boundary, so do not scan further.\n\t\t\telse if ( value.item.is( 'element', 'br' ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\t// Found a text node in the same container element.\n\t\t\telse if ( value.item.is( '$textProxy' ) ) {\n\t\t\t\treturn value.item;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Helper function. For the given text node, it finds the closest touching node which is either\n\t * a text node or a ` `. The search is terminated at block element boundaries and if a matching node\n\t * wasn't found so far, `null` is returned.\n\t *\n\t * In the following DOM structure:\n\t *\n\t *\t\tfoobar bom
\n\t *\n\t * * `foo` doesn't have its previous touching inline node (`null` is returned),\n\t * * `foo`'s next touching inline node is `bar`\n\t * * `bar`'s next touching inline node is ` `\n\t *\n\t * This method returns text nodes and ` ` elements because these types of nodes affect how\n\t * spaces in the given text node need to be converted.\n\t *\n\t * @private\n\t * @param {Text} node\n\t * @param {Boolean} getNext\n\t * @returns {Text|Element|null}\n\t */\n\t_getTouchingInlineDomNode( node, getNext ) {\n\t\tif ( !node.parentNode ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst direction = getNext ? 'nextNode' : 'previousNode';\n\t\tconst document = node.ownerDocument;\n\t\tconst topmostParent = getAncestors( node )[ 0 ];\n\n\t\tconst treeWalker = document.createTreeWalker( topmostParent, NodeFilter.SHOW_TEXT | NodeFilter.SHOW_ELEMENT, {\n\t\t\tacceptNode( node ) {\n\t\t\t\tif ( isText( node ) ) {\n\t\t\t\t\treturn NodeFilter.FILTER_ACCEPT;\n\t\t\t\t}\n\n\t\t\t\tif ( node.tagName == 'BR' ) {\n\t\t\t\t\treturn NodeFilter.FILTER_ACCEPT;\n\t\t\t\t}\n\n\t\t\t\treturn NodeFilter.FILTER_SKIP;\n\t\t\t}\n\t\t} );\n\n\t\ttreeWalker.currentNode = node;\n\n\t\tconst touchingNode = treeWalker[ direction ]();\n\n\t\tif ( touchingNode !== null ) {\n\t\t\tconst lca = getCommonAncestor( node, touchingNode );\n\n\t\t\t// If there is common ancestor between the text node and next/prev text node,\n\t\t\t// and there are no block elements on a way from the text node to that ancestor,\n\t\t\t// and there are no block elements on a way from next/prev text node to that ancestor...\n\t\t\tif (\n\t\t\t\tlca &&\n\t\t\t\t!_hasDomParentOfType( node, this.blockElements, lca ) &&\n\t\t\t\t!_hasDomParentOfType( touchingNode, this.blockElements, lca )\n\t\t\t) {\n\t\t\t\t// Then they are in the same container element.\n\t\t\t\treturn touchingNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n}\n\n// Helper function.\n// Used to check if given native `Element` or `Text` node has parent with tag name from `types` array.\n//\n// @param {Node} node\n// @param {Array.} types\n// @param {Boolean} [boundaryParent] Can be given if parents should be checked up to a given element (excluding that element).\n// @returns {Boolean} `true` if such parent exists or `false` if it does not.\nfunction _hasDomParentOfType( node, types, boundaryParent ) {\n\tlet parents = getAncestors( node );\n\n\tif ( boundaryParent ) {\n\t\tparents = parents.slice( parents.indexOf( boundaryParent ) + 1 );\n\t}\n\n\treturn parents.some( parent => parent.tagName && types.includes( parent.tagName.toLowerCase() ) );\n}\n\n// A helper that executes given callback for each DOM node's ancestor, starting from the given node\n// and ending in document#documentElement.\n//\n// @param {Node} node\n// @param {Function} callback A callback to be executed for each ancestor.\nfunction forEachDomNodeAncestor( node, callback ) {\n\twhile ( node && node != global.document ) {\n\t\tcallback( node );\n\t\tnode = node.parentNode;\n\t}\n}\n\n// Checks if given node is a nbsp block filler.\n//\n// A is a block filler only if it is a single child of a block element.\n//\n// @param {Node} domNode DOM node.\n// @returns {Boolean}\nfunction isNbspBlockFiller( domNode, blockElements ) {\n\tconst isNBSP = isText( domNode ) && domNode.data == '\\u00A0';\n\n\treturn isNBSP && hasBlockParent( domNode, blockElements ) && domNode.parentNode.childNodes.length === 1;\n}\n\n// Checks if domNode has block parent.\n//\n// @param {Node} domNode DOM node.\n// @returns {Boolean}\nfunction hasBlockParent( domNode, blockElements ) {\n\tconst parent = domNode.parentNode;\n\n\treturn parent && parent.tagName && blockElements.includes( parent.tagName.toLowerCase() );\n}\n\n/**\n * Enum representing type of the block filler.\n *\n * Possible values:\n *\n * * `br` - for ` ` block filler used in editing view,\n * * `nbsp` - for ` ` block fillers used in the data.\n *\n * @typedef {String} module:engine/view/filler~BlockFillerMode\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/getcommonancestor\n */\n\nimport getAncestors from './getancestors';\n\n/**\n * Searches and returns the lowest common ancestor of two given nodes.\n *\n * @param {Node} nodeA First node.\n * @param {Node} nodeB Second node.\n * @returns {Node|DocumentFragment|Document|null} Lowest common ancestor of both nodes or `null` if nodes do not have a common ancestor.\n */\nexport default function getCommonAncestor( nodeA, nodeB ) {\n\tconst ancestorsA = getAncestors( nodeA );\n\tconst ancestorsB = getAncestors( nodeB );\n\n\tlet i = 0;\n\n\t// It does not matter which array is shorter.\n\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\ti++;\n\t}\n\n\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/iswindow\n */\n\n/**\n * Checks if the object is a native DOM Window.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isWindow( obj ) {\n\tconst stringifiedObject = Object.prototype.toString.apply( obj );\n\n\t// Returns `true` for the `window` object in browser environments.\n\tif ( stringifiedObject == '[object Window]' ) {\n\t\treturn true;\n\t}\n\n\t// Returns `true` for the `window` object in the Electron environment.\n\tif ( stringifiedObject == '[object global]' ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/emittermixin\n */\n\nimport { default as EmitterMixin, _getEmitterListenedTo, _setEmitterId } from '../emittermixin';\nimport uid from '../uid';\nimport isNode from './isnode';\nimport isWindow from './iswindow';\nimport { extend } from 'lodash-es';\n\n/**\n * Mixin that injects the DOM events API into its host. It provides the API\n * compatible with {@link module:utils/emittermixin~EmitterMixin}.\n *\n * DOM emitter mixin is by default available in the {@link module:ui/view~View} class,\n * but it can also be mixed into any other class:\n *\n *\t\timport mix from '../utils/mix.js';\n *\t\timport DomEmitterMixin from '../utils/dom/emittermixin.js';\n *\n *\t\tclass SomeView {}\n *\t\tmix( SomeView, DomEmitterMixin );\n *\n *\t\tconst view = new SomeView();\n *\t\tview.listenTo( domElement, ( evt, domEvt ) => {\n *\t\t\tconsole.log( evt, domEvt );\n *\t\t} );\n *\n * @mixin EmitterMixin\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/dom/emittermixin~Emitter\n */\nconst DomEmitterMixin = extend( {}, EmitterMixin, {\n\t/**\n\t * Registers a callback function to be executed when an event is fired in a specific Emitter or DOM Node.\n\t * It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#listenTo}.\n\t *\n\t * @param {module:utils/emittermixin~Emitter|Node} emitter The object that fires the event.\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n\t * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n\t * order they were added.\n\t * @param {Boolean} [options.useCapture=false] Indicates that events of this type will be dispatched to the registered\n\t * listener before being dispatched to any EventTarget beneath it in the DOM tree.\n\t * @param {Boolean} [options.usePassive=false] Indicates that the function specified by listener will never call preventDefault()\n\t * and prevents blocking browser's main thread by this event handler.\n\t */\n\tlistenTo( emitter, ...rest ) {\n\t\t// Check if emitter is an instance of DOM Node. If so, replace the argument with\n\t\t// corresponding ProxyEmitter (or create one if not existing).\n\t\tif ( isNode( emitter ) || isWindow( emitter ) ) {\n\t\t\tconst proxy = this._getProxyEmitter( emitter ) || new ProxyEmitter( emitter );\n\n\t\t\tproxy.attach( ...rest );\n\n\t\t\temitter = proxy;\n\t\t}\n\n\t\t// Execute parent class method with Emitter (or ProxyEmitter) instance.\n\t\tEmitterMixin.listenTo.call( this, emitter, ...rest );\n\t},\n\n\t/**\n\t * Stops listening for events. It can be used at different levels:\n\t * It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#listenTo}.\n\t *\n\t * * To stop listening to a specific callback.\n\t * * To stop listening to a specific event.\n\t * * To stop listening to all events fired by a specific object.\n\t * * To stop listening to all events fired by all object.\n\t *\n\t * @param {module:utils/emittermixin~Emitter|Node} [emitter] The object to stop listening to. If omitted, stops it for all objects.\n\t * @param {String} [event] (Requires the `emitter`) The name of the event to stop listening to. If omitted, stops it\n\t * for all events from `emitter`.\n\t * @param {Function} [callback] (Requires the `event`) The function to be removed from the call list for the given\n\t * `event`.\n\t */\n\tstopListening( emitter, event, callback ) {\n\t\t// Check if emitter is an instance of DOM Node. If so, replace the argument with corresponding ProxyEmitter.\n\t\tif ( isNode( emitter ) || isWindow( emitter ) ) {\n\t\t\tconst proxy = this._getProxyEmitter( emitter );\n\n\t\t\t// Element has no listeners.\n\t\t\tif ( !proxy ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\temitter = proxy;\n\t\t}\n\n\t\t// Execute parent class method with Emitter (or ProxyEmitter) instance.\n\t\tEmitterMixin.stopListening.call( this, emitter, event, callback );\n\n\t\tif ( emitter instanceof ProxyEmitter ) {\n\t\t\temitter.detach( event );\n\t\t}\n\t},\n\n\t/**\n\t * Retrieves ProxyEmitter instance for given DOM Node residing in this Host.\n\t *\n\t * @private\n\t * @param {Node} node DOM Node of the ProxyEmitter.\n\t * @returns {module:utils/dom/emittermixin~ProxyEmitter} ProxyEmitter instance or null.\n\t */\n\t_getProxyEmitter( node ) {\n\t\treturn _getEmitterListenedTo( this, getNodeUID( node ) );\n\t}\n} );\n\nexport default DomEmitterMixin;\n\n/**\n * Creates a ProxyEmitter instance. Such an instance is a bridge between a DOM Node firing events\n * and any Host listening to them. It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#on}.\n *\n * listenTo( click, ... )\n * +-----------------------------------------+\n * | stopListening( ... ) |\n * +----------------------------+ | addEventListener( click, ... )\n * | Host | | +---------------------------------------------+\n * +----------------------------+ | | removeEventListener( click, ... ) |\n * | _listeningTo: { | +----------v-------------+ |\n * | UID: { | | ProxyEmitter | |\n * | emitter: ProxyEmitter, | +------------------------+ +------------v----------+\n * | callbacks: { | | events: { | | Node (HTMLElement) |\n * | click: [ callbacks ] | | click: [ callbacks ] | +-----------------------+\n * | } | | }, | | data-ck-expando: UID |\n * | } | | _domNode: Node, | +-----------------------+\n * | } | | _domListeners: {}, | |\n * | +------------------------+ | | _emitterId: UID | |\n * | | DomEmitterMixin | | +--------------^---------+ |\n * | +------------------------+ | | | |\n * +--------------^-------------+ | +---------------------------------------------+\n * | | click (DOM Event)\n * +-----------------------------------------+\n * fire( click, DOM Event )\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/dom/emittermixin~Emitter\n * @private\n */\nclass ProxyEmitter {\n\t/**\n\t * @param {Node} node DOM Node that fires events.\n\t * @returns {Object} ProxyEmitter instance bound to the DOM Node.\n\t */\n\tconstructor( node ) {\n\t\t// Set emitter ID to match DOM Node \"expando\" property.\n\t\t_setEmitterId( this, getNodeUID( node ) );\n\n\t\t// Remember the DOM Node this ProxyEmitter is bound to.\n\t\tthis._domNode = node;\n\t}\n}\n\nextend( ProxyEmitter.prototype, EmitterMixin, {\n\t/**\n\t * Collection of native DOM listeners.\n\t *\n\t * @private\n\t * @member {Object} module:utils/dom/emittermixin~ProxyEmitter#_domListeners\n\t */\n\n\t/**\n\t * Registers a callback function to be executed when an event is fired.\n\t *\n\t * It attaches a native DOM listener to the DOM Node. When fired,\n\t * a corresponding Emitter event will also fire with DOM Event object as an argument.\n\t *\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#attach\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {Boolean} [options.useCapture=false] Indicates that events of this type will be dispatched to the registered\n\t * listener before being dispatched to any EventTarget beneath it in the DOM tree.\n\t * @param {Boolean} [options.usePassive=false] Indicates that the function specified by listener will never call preventDefault()\n\t * and prevents blocking browser's main thread by this event handler.\n\t */\n\tattach( event, callback, options = {} ) {\n\t\t// If the DOM Listener for given event already exist it is pointless\n\t\t// to attach another one.\n\t\tif ( this._domListeners && this._domListeners[ event ] ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst listenerOptions = {\n\t\t\tcapture: !!options.useCapture,\n\t\t\tpassive: !!options.usePassive\n\t\t};\n\n\t\tconst domListener = this._createDomListener( event, listenerOptions );\n\n\t\t// Attach the native DOM listener to DOM Node.\n\t\tthis._domNode.addEventListener( event, domListener, listenerOptions );\n\n\t\tif ( !this._domListeners ) {\n\t\t\tthis._domListeners = {};\n\t\t}\n\n\t\t// Store the native DOM listener in this ProxyEmitter. It will be helpful\n\t\t// when stopping listening to the event.\n\t\tthis._domListeners[ event ] = domListener;\n\t},\n\n\t/**\n\t * Stops executing the callback on the given event.\n\t *\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#detach\n\t * @param {String} event The name of the event.\n\t */\n\tdetach( event ) {\n\t\tlet events;\n\n\t\t// Remove native DOM listeners which are orphans. If no callbacks\n\t\t// are awaiting given event, detach native DOM listener from DOM Node.\n\t\t// See: {@link attach}.\n\n\t\tif ( this._domListeners[ event ] && ( !( events = this._events[ event ] ) || !events.callbacks.length ) ) {\n\t\t\tthis._domListeners[ event ].removeListener();\n\t\t}\n\t},\n\n\t/**\n\t * Creates a native DOM listener callback. When the native DOM event\n\t * is fired it will fire corresponding event on this ProxyEmitter.\n\t * Note: A native DOM Event is passed as an argument.\n\t *\n\t * @private\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#_createDomListener\n\t * @param {String} event The name of the event.\n\t * @param {Object} [options] Additional options.\n\t * @param {Boolean} [options.capture=false] Indicates whether the listener was created for capturing event.\n\t * @param {Boolean} [options.passive=false] Indicates that the function specified by listener will never call preventDefault()\n\t * and prevents blocking browser's main thread by this event handler.\n\t * @returns {Function} The DOM listener callback.\n\t */\n\t_createDomListener( event, options ) {\n\t\tconst domListener = domEvt => {\n\t\t\tthis.fire( event, domEvt );\n\t\t};\n\n\t\t// Supply the DOM listener callback with a function that will help\n\t\t// detach it from the DOM Node, when it is no longer necessary.\n\t\t// See: {@link detach}.\n\t\tdomListener.removeListener = () => {\n\t\t\tthis._domNode.removeEventListener( event, domListener, options );\n\t\t\tdelete this._domListeners[ event ];\n\t\t};\n\n\t\treturn domListener;\n\t}\n} );\n\n// Gets an unique DOM Node identifier. The identifier will be set if not defined.\n//\n// @private\n// @param {Node} node\n// @returns {String} UID for given DOM Node.\nfunction getNodeUID( node ) {\n\treturn node[ 'data-ck-expando' ] || ( node[ 'data-ck-expando' ] = uid() );\n}\n\n/**\n * Interface representing classes which mix in {@link module:utils/dom/emittermixin~EmitterMixin}.\n *\n * @interface Emitter\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/observer\n */\n\nimport DomEmitterMixin from '@ckeditor/ckeditor5-utils/src/dom/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Abstract base observer class. Observers are classes which listen to DOM events, do the preliminary\n * processing and fire events on the {@link module:engine/view/document~Document} objects.\n * Observers can also add features to the view, for instance by updating its status or marking elements\n * which need refresh on DOM events.\n *\n * @abstract\n */\nexport default class Observer {\n\t/**\n\t * Creates an instance of the observer.\n\t *\n\t * @param {module:engine/view/view~View} view\n\t */\n\tconstructor( view ) {\n\t\t/**\n\t\t * Instance of the view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View}\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/document~Document} object.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = view.document;\n\n\t\t/**\n\t\t * State of the observer. If it is disabled events will not be fired.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.isEnabled = false;\n\t}\n\n\t/**\n\t * Enables the observer. This method is called when the observer is registered to the\n\t * {@link module:engine/view/view~View} and after {@link module:engine/view/view~View#forceRender rendering}\n\t * (all observers are {@link #disable disabled} before rendering).\n\t *\n\t * A typical use case for disabling observers is that mutation observers need to be disabled for the rendering.\n\t * However, a child class may not need to be disabled, so it can implement an empty method.\n\t *\n\t * @see module:engine/view/observer/observer~Observer#disable\n\t */\n\tenable() {\n\t\tthis.isEnabled = true;\n\t}\n\n\t/**\n\t * Disables the observer. This method is called before\n\t * {@link module:engine/view/view~View#forceRender rendering} to prevent firing events during rendering.\n\t *\n\t * @see module:engine/view/observer/observer~Observer#enable\n\t */\n\tdisable() {\n\t\tthis.isEnabled = false;\n\t}\n\n\t/**\n\t * Disables and destroys the observer, among others removes event listeners created by the observer.\n\t */\n\tdestroy() {\n\t\tthis.disable();\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Starts observing the given root element.\n\t *\n\t * @method #observe\n\t * @param {HTMLElement} domElement\n\t * @param {String} name The name of the root element.\n\t */\n}\n\nmix( Observer, DomEmitterMixin );\n","/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Adds `value` to the array cache.\n *\n * @private\n * @name add\n * @memberOf SetCache\n * @alias push\n * @param {*} value The value to cache.\n * @returns {Object} Returns the cache instance.\n */\nfunction setCacheAdd(value) {\n this.__data__.set(value, HASH_UNDEFINED);\n return this;\n}\n\nexport default setCacheAdd;\n","/**\n * Checks if `value` is in the array cache.\n *\n * @private\n * @name has\n * @memberOf SetCache\n * @param {*} value The value to search for.\n * @returns {number} Returns `true` if `value` is found, else `false`.\n */\nfunction setCacheHas(value) {\n return this.__data__.has(value);\n}\n\nexport default setCacheHas;\n","import MapCache from './_MapCache.js';\nimport setCacheAdd from './_setCacheAdd.js';\nimport setCacheHas from './_setCacheHas.js';\n\n/**\n *\n * Creates an array cache object to store unique values.\n *\n * @private\n * @constructor\n * @param {Array} [values] The values to cache.\n */\nfunction SetCache(values) {\n var index = -1,\n length = values == null ? 0 : values.length;\n\n this.__data__ = new MapCache;\n while (++index < length) {\n this.add(values[index]);\n }\n}\n\n// Add methods to `SetCache`.\nSetCache.prototype.add = SetCache.prototype.push = setCacheAdd;\nSetCache.prototype.has = setCacheHas;\n\nexport default SetCache;\n","/**\n * A specialized version of `_.some` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {boolean} Returns `true` if any element passes the predicate check,\n * else `false`.\n */\nfunction arraySome(array, predicate) {\n var index = -1,\n length = array == null ? 0 : array.length;\n\n while (++index < length) {\n if (predicate(array[index], index, array)) {\n return true;\n }\n }\n return false;\n}\n\nexport default arraySome;\n","/**\n * Checks if a `cache` value for `key` exists.\n *\n * @private\n * @param {Object} cache The cache to query.\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction cacheHas(cache, key) {\n return cache.has(key);\n}\n\nexport default cacheHas;\n","import SetCache from './_SetCache.js';\nimport arraySome from './_arraySome.js';\nimport cacheHas from './_cacheHas.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1,\n COMPARE_UNORDERED_FLAG = 2;\n\n/**\n * A specialized version of `baseIsEqualDeep` for arrays with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Array} array The array to compare.\n * @param {Array} other The other array to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `array` and `other` objects.\n * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.\n */\nfunction equalArrays(array, other, bitmask, customizer, equalFunc, stack) {\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG,\n arrLength = array.length,\n othLength = other.length;\n\n if (arrLength != othLength && !(isPartial && othLength > arrLength)) {\n return false;\n }\n // Assume cyclic values are equal.\n var stacked = stack.get(array);\n if (stacked && stack.get(other)) {\n return stacked == other;\n }\n var index = -1,\n result = true,\n seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;\n\n stack.set(array, other);\n stack.set(other, array);\n\n // Ignore non-index properties.\n while (++index < arrLength) {\n var arrValue = array[index],\n othValue = other[index];\n\n if (customizer) {\n var compared = isPartial\n ? customizer(othValue, arrValue, index, other, array, stack)\n : customizer(arrValue, othValue, index, array, other, stack);\n }\n if (compared !== undefined) {\n if (compared) {\n continue;\n }\n result = false;\n break;\n }\n // Recursively compare arrays (susceptible to call stack limits).\n if (seen) {\n if (!arraySome(other, function(othValue, othIndex) {\n if (!cacheHas(seen, othIndex) &&\n (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {\n return seen.push(othIndex);\n }\n })) {\n result = false;\n break;\n }\n } else if (!(\n arrValue === othValue ||\n equalFunc(arrValue, othValue, bitmask, customizer, stack)\n )) {\n result = false;\n break;\n }\n }\n stack['delete'](array);\n stack['delete'](other);\n return result;\n}\n\nexport default equalArrays;\n","/**\n * Converts `map` to its key-value pairs.\n *\n * @private\n * @param {Object} map The map to convert.\n * @returns {Array} Returns the key-value pairs.\n */\nfunction mapToArray(map) {\n var index = -1,\n result = Array(map.size);\n\n map.forEach(function(value, key) {\n result[++index] = [key, value];\n });\n return result;\n}\n\nexport default mapToArray;\n","/**\n * Converts `set` to an array of its values.\n *\n * @private\n * @param {Object} set The set to convert.\n * @returns {Array} Returns the values.\n */\nfunction setToArray(set) {\n var index = -1,\n result = Array(set.size);\n\n set.forEach(function(value) {\n result[++index] = value;\n });\n return result;\n}\n\nexport default setToArray;\n","import Symbol from './_Symbol.js';\nimport Uint8Array from './_Uint8Array.js';\nimport eq from './eq.js';\nimport equalArrays from './_equalArrays.js';\nimport mapToArray from './_mapToArray.js';\nimport setToArray from './_setToArray.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1,\n COMPARE_UNORDERED_FLAG = 2;\n\n/** `Object#toString` result references. */\nvar boolTag = '[object Boolean]',\n dateTag = '[object Date]',\n errorTag = '[object Error]',\n mapTag = '[object Map]',\n numberTag = '[object Number]',\n regexpTag = '[object RegExp]',\n setTag = '[object Set]',\n stringTag = '[object String]',\n symbolTag = '[object Symbol]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n dataViewTag = '[object DataView]';\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;\n\n/**\n * A specialized version of `baseIsEqualDeep` for comparing objects of\n * the same `toStringTag`.\n *\n * **Note:** This function only supports comparing values with tags of\n * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {string} tag The `toStringTag` of the objects to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {\n switch (tag) {\n case dataViewTag:\n if ((object.byteLength != other.byteLength) ||\n (object.byteOffset != other.byteOffset)) {\n return false;\n }\n object = object.buffer;\n other = other.buffer;\n\n case arrayBufferTag:\n if ((object.byteLength != other.byteLength) ||\n !equalFunc(new Uint8Array(object), new Uint8Array(other))) {\n return false;\n }\n return true;\n\n case boolTag:\n case dateTag:\n case numberTag:\n // Coerce booleans to `1` or `0` and dates to milliseconds.\n // Invalid dates are coerced to `NaN`.\n return eq(+object, +other);\n\n case errorTag:\n return object.name == other.name && object.message == other.message;\n\n case regexpTag:\n case stringTag:\n // Coerce regexes to strings and treat strings, primitives and objects,\n // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring\n // for more details.\n return object == (other + '');\n\n case mapTag:\n var convert = mapToArray;\n\n case setTag:\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG;\n convert || (convert = setToArray);\n\n if (object.size != other.size && !isPartial) {\n return false;\n }\n // Assume cyclic values are equal.\n var stacked = stack.get(object);\n if (stacked) {\n return stacked == other;\n }\n bitmask |= COMPARE_UNORDERED_FLAG;\n\n // Recursively compare objects (susceptible to call stack limits).\n stack.set(object, other);\n var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);\n stack['delete'](object);\n return result;\n\n case symbolTag:\n if (symbolValueOf) {\n return symbolValueOf.call(object) == symbolValueOf.call(other);\n }\n }\n return false;\n}\n\nexport default equalByTag;\n","import getAllKeys from './_getAllKeys.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1;\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * A specialized version of `baseIsEqualDeep` for objects with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction equalObjects(object, other, bitmask, customizer, equalFunc, stack) {\n var isPartial = bitmask & COMPARE_PARTIAL_FLAG,\n objProps = getAllKeys(object),\n objLength = objProps.length,\n othProps = getAllKeys(other),\n othLength = othProps.length;\n\n if (objLength != othLength && !isPartial) {\n return false;\n }\n var index = objLength;\n while (index--) {\n var key = objProps[index];\n if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {\n return false;\n }\n }\n // Assume cyclic values are equal.\n var stacked = stack.get(object);\n if (stacked && stack.get(other)) {\n return stacked == other;\n }\n var result = true;\n stack.set(object, other);\n stack.set(other, object);\n\n var skipCtor = isPartial;\n while (++index < objLength) {\n key = objProps[index];\n var objValue = object[key],\n othValue = other[key];\n\n if (customizer) {\n var compared = isPartial\n ? customizer(othValue, objValue, key, other, object, stack)\n : customizer(objValue, othValue, key, object, other, stack);\n }\n // Recursively compare objects (susceptible to call stack limits).\n if (!(compared === undefined\n ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))\n : compared\n )) {\n result = false;\n break;\n }\n skipCtor || (skipCtor = key == 'constructor');\n }\n if (result && !skipCtor) {\n var objCtor = object.constructor,\n othCtor = other.constructor;\n\n // Non `Object` object instances with different constructors are not equal.\n if (objCtor != othCtor &&\n ('constructor' in object && 'constructor' in other) &&\n !(typeof objCtor == 'function' && objCtor instanceof objCtor &&\n typeof othCtor == 'function' && othCtor instanceof othCtor)) {\n result = false;\n }\n }\n stack['delete'](object);\n stack['delete'](other);\n return result;\n}\n\nexport default equalObjects;\n","import Stack from './_Stack.js';\nimport equalArrays from './_equalArrays.js';\nimport equalByTag from './_equalByTag.js';\nimport equalObjects from './_equalObjects.js';\nimport getTag from './_getTag.js';\nimport isArray from './isArray.js';\nimport isBuffer from './isBuffer.js';\nimport isTypedArray from './isTypedArray.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1;\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n arrayTag = '[object Array]',\n objectTag = '[object Object]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * A specialized version of `baseIsEqual` for arrays and objects which performs\n * deep comparisons and tracks traversed objects enabling objects with circular\n * references to be compared.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} [stack] Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {\n var objIsArr = isArray(object),\n othIsArr = isArray(other),\n objTag = objIsArr ? arrayTag : getTag(object),\n othTag = othIsArr ? arrayTag : getTag(other);\n\n objTag = objTag == argsTag ? objectTag : objTag;\n othTag = othTag == argsTag ? objectTag : othTag;\n\n var objIsObj = objTag == objectTag,\n othIsObj = othTag == objectTag,\n isSameTag = objTag == othTag;\n\n if (isSameTag && isBuffer(object)) {\n if (!isBuffer(other)) {\n return false;\n }\n objIsArr = true;\n objIsObj = false;\n }\n if (isSameTag && !objIsObj) {\n stack || (stack = new Stack);\n return (objIsArr || isTypedArray(object))\n ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)\n : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);\n }\n if (!(bitmask & COMPARE_PARTIAL_FLAG)) {\n var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),\n othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');\n\n if (objIsWrapped || othIsWrapped) {\n var objUnwrapped = objIsWrapped ? object.value() : object,\n othUnwrapped = othIsWrapped ? other.value() : other;\n\n stack || (stack = new Stack);\n return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);\n }\n }\n if (!isSameTag) {\n return false;\n }\n stack || (stack = new Stack);\n return equalObjects(object, other, bitmask, customizer, equalFunc, stack);\n}\n\nexport default baseIsEqualDeep;\n","import baseIsEqualDeep from './_baseIsEqualDeep.js';\nimport isObjectLike from './isObjectLike.js';\n\n/**\n * The base implementation of `_.isEqual` which supports partial comparisons\n * and tracks traversed objects.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {boolean} bitmask The bitmask flags.\n * 1 - Unordered comparison\n * 2 - Partial comparison\n * @param {Function} [customizer] The function to customize comparisons.\n * @param {Object} [stack] Tracks traversed `value` and `other` objects.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n */\nfunction baseIsEqual(value, other, bitmask, customizer, stack) {\n if (value === other) {\n return true;\n }\n if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {\n return value !== value && other !== other;\n }\n return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);\n}\n\nexport default baseIsEqual;\n","import baseIsEqual from './_baseIsEqual.js';\n\n/**\n * This method is like `_.isEqual` except that it accepts `customizer` which\n * is invoked to compare values. If `customizer` returns `undefined`, comparisons\n * are handled by the method instead. The `customizer` is invoked with up to\n * six arguments: (objValue, othValue [, index|key, object, other, stack]).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * function isGreeting(value) {\n * return /^h(?:i|ello)$/.test(value);\n * }\n *\n * function customizer(objValue, othValue) {\n * if (isGreeting(objValue) && isGreeting(othValue)) {\n * return true;\n * }\n * }\n *\n * var array = ['hello', 'goodbye'];\n * var other = ['hi', 'goodbye'];\n *\n * _.isEqualWith(array, other, customizer);\n * // => true\n */\nfunction isEqualWith(value, other, customizer) {\n customizer = typeof customizer == 'function' ? customizer : undefined;\n var result = customizer ? customizer(value, other) : undefined;\n return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;\n}\n\nexport default isEqualWith;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/mutationobserver\n */\n\n/* globals window */\n\nimport Observer from './observer';\nimport ViewSelection from '../selection';\nimport { startsWithFiller, getDataWithoutFiller } from '../filler';\nimport { isEqualWith } from 'lodash-es';\n\n/**\n * Mutation observer class observes changes in the DOM, fires {@link module:engine/view/document~Document#event:mutations} event, mark view\n * elements as changed and call {@link module:engine/view/renderer~Renderer#render}.\n * Because all mutated nodes are marked as \"to be rendered\" and the\n * {@link module:engine/view/renderer~Renderer#render} is called, all changes will be reverted, unless the mutation will be handled by the\n * {@link module:engine/view/document~Document#event:mutations} event listener. It means user will see only handled changes, and the editor\n * will block all changes which are not handled.\n *\n * Mutation Observer also take care of reducing number of mutations which are fired. It removes duplicates and\n * mutations on elements which do not have corresponding view elements. Also\n * {@link module:engine/view/observer/mutationobserver~MutatedText text mutation} is fired only if parent element do not change child list.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class MutationObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Native mutation observer config.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._config = {\n\t\t\tchildList: true,\n\t\t\tcharacterData: true,\n\t\t\tcharacterDataOldValue: true,\n\t\t\tsubtree: true\n\t\t};\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#domConverter}.\n\t\t *\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = view.domConverter;\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#_renderer}.\n\t\t *\n\t\t * @member {module:engine/view/renderer~Renderer}\n\t\t */\n\t\tthis.renderer = view._renderer;\n\n\t\t/**\n\t\t * Observed DOM elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Array.}\n\t\t */\n\t\tthis._domElements = [];\n\n\t\t/**\n\t\t * Native mutation observer.\n\t\t *\n\t\t * @private\n\t\t * @member {MutationObserver}\n\t\t */\n\t\tthis._mutationObserver = new window.MutationObserver( this._onMutations.bind( this ) );\n\t}\n\n\t/**\n\t * Synchronously fires {@link module:engine/view/document~Document#event:mutations} event with all mutations in record queue.\n\t * At the same time empties the queue so mutations will not be fired twice.\n\t */\n\tflush() {\n\t\tthis._onMutations( this._mutationObserver.takeRecords() );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tthis._domElements.push( domElement );\n\n\t\tif ( this.isEnabled ) {\n\t\t\tthis._mutationObserver.observe( domElement, this._config );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tenable() {\n\t\tsuper.enable();\n\n\t\tfor ( const domElement of this._domElements ) {\n\t\t\tthis._mutationObserver.observe( domElement, this._config );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdisable() {\n\t\tsuper.disable();\n\n\t\tthis._mutationObserver.disconnect();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._mutationObserver.disconnect();\n\t}\n\n\t/**\n\t * Handles mutations. Deduplicates, mark view elements to sync, fire event and call render.\n\t *\n\t * @private\n\t * @param {Array.} domMutations Array of native mutations.\n\t */\n\t_onMutations( domMutations ) {\n\t\t// As a result of this.flush() we can have an empty collection.\n\t\tif ( domMutations.length === 0 ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domConverter = this.domConverter;\n\n\t\t// Use map and set for deduplication.\n\t\tconst mutatedTexts = new Map();\n\t\tconst mutatedElements = new Set();\n\n\t\t// Handle `childList` mutations first, so we will be able to check if the `characterData` mutation is in the\n\t\t// element with changed structure anyway.\n\t\tfor ( const mutation of domMutations ) {\n\t\t\tif ( mutation.type === 'childList' ) {\n\t\t\t\tconst element = domConverter.mapDomToView( mutation.target );\n\n\t\t\t\t// Do not collect mutations from UIElements and RawElements.\n\t\t\t\tif ( element && ( element.is( 'uiElement' ) || element.is( 'rawElement' ) ) ) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif ( element && !this._isBogusBrMutation( mutation ) ) {\n\t\t\t\t\tmutatedElements.add( element );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Handle `characterData` mutations later, when we have the full list of nodes which changed structure.\n\t\tfor ( const mutation of domMutations ) {\n\t\t\tconst element = domConverter.mapDomToView( mutation.target );\n\n\t\t\t// Do not collect mutations from UIElements and RawElements.\n\t\t\tif ( element && ( element.is( 'uiElement' ) || element.is( 'rawElement' ) ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tif ( mutation.type === 'characterData' ) {\n\t\t\t\tconst text = domConverter.findCorrespondingViewText( mutation.target );\n\n\t\t\t\tif ( text && !mutatedElements.has( text.parent ) ) {\n\t\t\t\t\t// Use text as a key, for deduplication. If there will be another mutation on the same text element\n\t\t\t\t\t// we will have only one in the map.\n\t\t\t\t\tmutatedTexts.set( text, {\n\t\t\t\t\t\ttype: 'text',\n\t\t\t\t\t\toldText: text.data,\n\t\t\t\t\t\tnewText: getDataWithoutFiller( mutation.target ),\n\t\t\t\t\t\tnode: text\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t\t// When we added first letter to the text node which had only inline filler, for the DOM it is mutation\n\t\t\t\t// on text, but for the view, where filler text node did not existed, new text node was created, so we\n\t\t\t\t// need to fire 'children' mutation instead of 'text'.\n\t\t\t\telse if ( !text && startsWithFiller( mutation.target ) ) {\n\t\t\t\t\tmutatedElements.add( domConverter.mapDomToView( mutation.target.parentNode ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Now we build the list of mutations to fire and mark elements. We did not do it earlier to avoid marking the\n\t\t// same node multiple times in case of duplication.\n\n\t\t// List of mutations we will fire.\n\t\tconst viewMutations = [];\n\n\t\tfor ( const mutatedText of mutatedTexts.values() ) {\n\t\t\tthis.renderer.markToSync( 'text', mutatedText.node );\n\t\t\tviewMutations.push( mutatedText );\n\t\t}\n\n\t\tfor ( const viewElement of mutatedElements ) {\n\t\t\tconst domElement = domConverter.mapViewToDom( viewElement );\n\t\t\tconst viewChildren = Array.from( viewElement.getChildren() );\n\t\t\tconst newViewChildren = Array.from( domConverter.domChildrenToView( domElement, { withChildren: false } ) );\n\n\t\t\t// It may happen that as a result of many changes (sth was inserted and then removed),\n\t\t\t// both elements haven't really changed. #1031\n\t\t\tif ( !isEqualWith( viewChildren, newViewChildren, sameNodes ) ) {\n\t\t\t\tthis.renderer.markToSync( 'children', viewElement );\n\n\t\t\t\tviewMutations.push( {\n\t\t\t\t\ttype: 'children',\n\t\t\t\t\toldChildren: viewChildren,\n\t\t\t\t\tnewChildren: newViewChildren,\n\t\t\t\t\tnode: viewElement\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\t// Retrieve `domSelection` using `ownerDocument` of one of mutated nodes.\n\t\t// There should not be simultaneous mutation in multiple documents, so it's fine.\n\t\tconst domSelection = domMutations[ 0 ].target.ownerDocument.getSelection();\n\n\t\tlet viewSelection = null;\n\n\t\tif ( domSelection && domSelection.anchorNode ) {\n\t\t\t// If `domSelection` is inside a dom node that is already bound to a view node from view tree, get\n\t\t\t// corresponding selection in the view and pass it together with `viewMutations`. The `viewSelection` may\n\t\t\t// be used by features handling mutations.\n\t\t\t// Only one range is supported.\n\n\t\t\tconst viewSelectionAnchor = domConverter.domPositionToView( domSelection.anchorNode, domSelection.anchorOffset );\n\t\t\tconst viewSelectionFocus = domConverter.domPositionToView( domSelection.focusNode, domSelection.focusOffset );\n\n\t\t\t// Anchor and focus has to be properly mapped to view.\n\t\t\tif ( viewSelectionAnchor && viewSelectionFocus ) {\n\t\t\t\tviewSelection = new ViewSelection( viewSelectionAnchor );\n\t\t\t\tviewSelection.setFocus( viewSelectionFocus );\n\t\t\t}\n\t\t}\n\n\t\t// In case only non-relevant mutations were recorded it skips the event and force render (#5600).\n\t\tif ( viewMutations.length ) {\n\t\t\tthis.document.fire( 'mutations', viewMutations, viewSelection );\n\n\t\t\t// If nothing changes on `mutations` event, at this point we have \"dirty DOM\" (changed) and de-synched\n\t\t\t// view (which has not been changed). In order to \"reset DOM\" we render the view again.\n\t\t\tthis.view.forceRender();\n\t\t}\n\n\t\tfunction sameNodes( child1, child2 ) {\n\t\t\t// First level of comparison (array of children vs array of children) – use the Lodash's default behavior.\n\t\t\tif ( Array.isArray( child1 ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Elements.\n\t\t\tif ( child1 === child2 ) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t\t// Texts.\n\t\t\telse if ( child1.is( '$text' ) && child2.is( '$text' ) ) {\n\t\t\t\treturn child1.data === child2.data;\n\t\t\t}\n\n\t\t\t// Not matching types.\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Checks if mutation was generated by the browser inserting bogus br on the end of the block element.\n\t * Such mutations are generated while pressing space or performing native spellchecker correction\n\t * on the end of the block element in Firefox browser.\n\t *\n\t * @private\n\t * @param {Object} mutation Native mutation object.\n\t * @returns {Boolean}\n\t */\n\t_isBogusBrMutation( mutation ) {\n\t\tlet addedNode = null;\n\n\t\t// Check if mutation added only one node on the end of its parent.\n\t\tif ( mutation.nextSibling === null && mutation.removedNodes.length === 0 && mutation.addedNodes.length == 1 ) {\n\t\t\taddedNode = this.domConverter.domToView( mutation.addedNodes[ 0 ], {\n\t\t\t\twithChildren: false\n\t\t\t} );\n\t\t}\n\n\t\treturn addedNode && addedNode.is( 'element', 'br' );\n\t}\n}\n\n/**\n * Fired when mutation occurred. If tree view is not changed on this event, DOM will be reverted to the state before\n * mutation, so all changes which should be applied, should be handled on this event.\n *\n * Introduced by {@link module:engine/view/observer/mutationobserver~MutationObserver}.\n *\n * Note that because {@link module:engine/view/observer/mutationobserver~MutationObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/mutationobserver~MutationObserver\n * @event module:engine/view/document~Document#event:mutations\n * @param {Array.}\n * viewMutations Array of mutations.\n * For mutated texts it will be {@link module:engine/view/observer/mutationobserver~MutatedText} and for mutated elements it will be\n * {@link module:engine/view/observer/mutationobserver~MutatedChildren}. You can recognize the type based on the `type` property.\n * @param {module:engine/view/selection~Selection|null} viewSelection View selection that is a result of converting DOM selection to view.\n * Keep in\n * mind that the DOM selection is already \"updated\", meaning that it already acknowledges changes done in mutation.\n */\n\n/**\n * Mutation item for text.\n *\n * @see module:engine/view/document~Document#event:mutations\n * @see module:engine/view/observer/mutationobserver~MutatedChildren\n *\n * @typedef {Object} module:engine/view/observer/mutationobserver~MutatedText\n *\n * @property {String} type For text mutations it is always 'text'.\n * @property {module:engine/view/text~Text} node Mutated text node.\n * @property {String} oldText Old text.\n * @property {String} newText New text.\n */\n\n/**\n * Mutation item for child nodes.\n *\n * @see module:engine/view/document~Document#event:mutations\n * @see module:engine/view/observer/mutationobserver~MutatedText\n *\n * @typedef {Object} module:engine/view/observer/mutationobserver~MutatedChildren\n *\n * @property {String} type For child nodes mutations it is always 'children'.\n * @property {module:engine/view/element~Element} node Parent of the mutated children.\n * @property {Array.} oldChildren Old child nodes.\n * @property {Array.} newChildren New child nodes.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/domeventdata\n */\n\nimport { extend } from 'lodash-es';\n\n/**\n * Information about a DOM event in context of the {@link module:engine/view/document~Document}.\n * It wraps the native event, which usually should not be used as the wrapper contains\n * additional data (like key code for keyboard events).\n */\nexport default class DomEventData {\n\t/**\n\t * @param {module:engine/view/view~View} view The instance of the view controller.\n\t * @param {Event} domEvent The DOM event.\n\t * @param {Object} [additionalData] Additional properties that the instance should contain.\n\t */\n\tconstructor( view, domEvent, additionalData ) {\n\t\t/**\n\t\t * Instance of the view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View} module:engine/view/observer/observer~Observer.DomEvent#view\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * The instance of the document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document} module:engine/view/observer/observer~Observer.DomEvent#document\n\t\t */\n\t\tthis.document = view.document;\n\n\t\t/**\n\t\t * The DOM event.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Event} module:engine/view/observer/observer~Observer.DomEvent#domEvent\n\t\t */\n\t\tthis.domEvent = domEvent;\n\n\t\t/**\n\t\t * The DOM target.\n\t\t *\n\t\t * @readonly\n\t\t * @member {HTMLElement} module:engine/view/observer/observer~Observer.DomEvent#target\n\t\t */\n\t\tthis.domTarget = domEvent.target;\n\n\t\textend( this, additionalData );\n\t}\n\n\t/**\n\t * The tree view element representing the target.\n\t *\n\t * @readonly\n\t * @type module:engine/view/element~Element\n\t */\n\tget target() {\n\t\treturn this.view.domConverter.mapDomToView( this.domTarget );\n\t}\n\n\t/**\n\t * Prevents the native's event default action.\n\t */\n\tpreventDefault() {\n\t\tthis.domEvent.preventDefault();\n\t}\n\n\t/**\n\t * Stops native event propagation.\n\t */\n\tstopPropagation() {\n\t\tthis.domEvent.stopPropagation();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/domeventobserver\n */\n\nimport Observer from './observer';\nimport DomEventData from './domeventdata';\n\n/**\n * Base class for DOM event observers. This class handles\n * {@link module:engine/view/observer/observer~Observer#observe adding} listeners to DOM elements,\n * {@link module:engine/view/observer/observer~Observer#disable disabling} and\n * {@link module:engine/view/observer/observer~Observer#enable re-enabling} events.\n * Child class needs to define\n * {@link module:engine/view/observer/domeventobserver~DomEventObserver#domEventType DOM event type} and\n * {@link module:engine/view/observer/domeventobserver~DomEventObserver#onDomEvent callback}.\n *\n * For instance:\n *\n *\t\tclass ClickObserver extends DomEventObserver {\n *\t\t\t// It can also be defined as a normal property in the constructor.\n *\t\t\tget domEventType() {\n *\t\t\t\treturn 'click';\n *\t\t\t}\n *\n *\t\t\tonDomEvent( domEvent ) {\n *\t\t\t\tthis.fire( 'click', domEvent );\n *\t\t\t}\n *\t\t}\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class DomEventObserver extends Observer {\n\t/**\n\t * Type of the DOM event the observer should listen on. Array of types can be defined\n\t * if the obsever should listen to multiple DOM events.\n\t *\n\t * @readonly\n\t * @member {String|Array.} #domEventType\n\t */\n\n\t/**\n\t * Callback which should be called when the DOM event occurred. Note that the callback will not be called if\n\t * observer {@link #isEnabled is not enabled}.\n\t *\n\t * @see #domEventType\n\t * @abstract\n\t * @method #onDomEvent\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * If set to `true` DOM events will be listened on the capturing phase.\n\t\t * Default value is `false`.\n\t\t *\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.useCapture = false;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tconst types = typeof this.domEventType == 'string' ? [ this.domEventType ] : this.domEventType;\n\n\t\ttypes.forEach( type => {\n\t\t\tthis.listenTo( domElement, type, ( eventInfo, domEvent ) => {\n\t\t\t\tif ( this.isEnabled ) {\n\t\t\t\t\tthis.onDomEvent( domEvent );\n\t\t\t\t}\n\t\t\t}, { useCapture: this.useCapture } );\n\t\t} );\n\t}\n\n\t/**\n\t * Calls `Document#fire()` if observer {@link #isEnabled is enabled}.\n\t *\n\t * @see module:utils/emittermixin~EmitterMixin#fire\n\t * @param {String} eventType The event type (name).\n\t * @param {Event} domEvent The DOM event.\n\t * @param {Object} [additionalData] The additional data which should extend the\n\t * {@link module:engine/view/observer/domeventdata~DomEventData event data} object.\n\t */\n\tfire( eventType, domEvent, additionalData ) {\n\t\tif ( this.isEnabled ) {\n\t\t\tthis.document.fire( eventType, new DomEventData( this.view, domEvent, additionalData ) );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/keyobserver\n */\n\nimport DomEventObserver from './domeventobserver';\nimport { getCode } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * Observer for events connected with pressing keyboard keys.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class KeyObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'keydown', 'keyup' ];\n\t}\n\n\tonDomEvent( domEvt ) {\n\t\tthis.fire( domEvt.type, domEvt, {\n\t\t\tkeyCode: domEvt.keyCode,\n\n\t\t\taltKey: domEvt.altKey,\n\t\t\tctrlKey: domEvt.ctrlKey || domEvt.metaKey,\n\t\t\tshiftKey: domEvt.shiftKey,\n\n\t\t\tget keystroke() {\n\t\t\t\treturn getCode( this );\n\t\t\t}\n\t\t} );\n\t}\n}\n\n/**\n * Fired when a key has been pressed.\n *\n * Introduced by {@link module:engine/view/observer/keyobserver~KeyObserver}.\n *\n * Note that because {@link module:engine/view/observer/keyobserver~KeyObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/keyobserver~KeyObserver\n * @event module:engine/view/document~Document#event:keydown\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEventData\n */\n\n/**\n * Fired when a key has been released.\n *\n * Introduced by {@link module:engine/view/observer/keyobserver~KeyObserver}.\n *\n * Note that because {@link module:engine/view/observer/keyobserver~KeyObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/keyobserver~KeyObserver\n * @event module:engine/view/document~Document#event:keyup\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEventData\n */\n\n/**\n * The value of both events - {@link module:engine/view/document~Document#event:keydown} and\n * {@link module:engine/view/document~Document#event:keyup}.\n *\n * @class module:engine/view/observer/keyobserver~KeyEventData\n * @extends module:engine/view/observer/domeventdata~DomEventData\n * @implements module:utils/keyboard~KeystrokeInfo\n */\n\n/**\n * Code of the whole keystroke. See {@link module:utils/keyboard~getCode}.\n *\n * @readonly\n * @member {Number} module:engine/view/observer/keyobserver~KeyEventData#keystroke\n */\n","import root from './_root.js';\n\n/**\n * Gets the timestamp of the number of milliseconds that have elapsed since\n * the Unix epoch (1 January 1970 00:00:00 UTC).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Date\n * @returns {number} Returns the timestamp.\n * @example\n *\n * _.defer(function(stamp) {\n * console.log(_.now() - stamp);\n * }, _.now());\n * // => Logs the number of milliseconds it took for the deferred invocation.\n */\nvar now = function() {\n return root.Date.now();\n};\n\nexport default now;\n","import isObject from './isObject.js';\nimport isSymbol from './isSymbol.js';\n\n/** Used as references for various `Number` constants. */\nvar NAN = 0 / 0;\n\n/** Used to match leading and trailing whitespace. */\nvar reTrim = /^\\s+|\\s+$/g;\n\n/** Used to detect bad signed hexadecimal string values. */\nvar reIsBadHex = /^[-+]0x[0-9a-f]+$/i;\n\n/** Used to detect binary string values. */\nvar reIsBinary = /^0b[01]+$/i;\n\n/** Used to detect octal string values. */\nvar reIsOctal = /^0o[0-7]+$/i;\n\n/** Built-in method references without a dependency on `root`. */\nvar freeParseInt = parseInt;\n\n/**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\nfunction toNumber(value) {\n if (typeof value == 'number') {\n return value;\n }\n if (isSymbol(value)) {\n return NAN;\n }\n if (isObject(value)) {\n var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n value = isObject(other) ? (other + '') : other;\n }\n if (typeof value != 'string') {\n return value === 0 ? value : +value;\n }\n value = value.replace(reTrim, '');\n var isBinary = reIsBinary.test(value);\n return (isBinary || reIsOctal.test(value))\n ? freeParseInt(value.slice(2), isBinary ? 2 : 8)\n : (reIsBadHex.test(value) ? NAN : +value);\n}\n\nexport default toNumber;\n","import isObject from './isObject.js';\nimport now from './now.js';\nimport toNumber from './toNumber.js';\n\n/** Error message constants. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max,\n nativeMin = Math.min;\n\n/**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide `options` to indicate whether `func` should be invoked on the\n * leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent\n * calls to the debounced function return the result of the last `func`\n * invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the debounced function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until to the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.debounce` and `_.throttle`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n * Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n * The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n * Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new debounced function.\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', _.debounce(calculateLayout, 150));\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', _.debounce(sendMail, 300, {\n * 'leading': true,\n * 'trailing': false\n * }));\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });\n * var source = new EventSource('/stream');\n * jQuery(source).on('message', debounced);\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel);\n */\nfunction debounce(func, wait, options) {\n var lastArgs,\n lastThis,\n maxWait,\n result,\n timerId,\n lastCallTime,\n lastInvokeTime = 0,\n leading = false,\n maxing = false,\n trailing = true;\n\n if (typeof func != 'function') {\n throw new TypeError(FUNC_ERROR_TEXT);\n }\n wait = toNumber(wait) || 0;\n if (isObject(options)) {\n leading = !!options.leading;\n maxing = 'maxWait' in options;\n maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;\n trailing = 'trailing' in options ? !!options.trailing : trailing;\n }\n\n function invokeFunc(time) {\n var args = lastArgs,\n thisArg = lastThis;\n\n lastArgs = lastThis = undefined;\n lastInvokeTime = time;\n result = func.apply(thisArg, args);\n return result;\n }\n\n function leadingEdge(time) {\n // Reset any `maxWait` timer.\n lastInvokeTime = time;\n // Start the timer for the trailing edge.\n timerId = setTimeout(timerExpired, wait);\n // Invoke the leading edge.\n return leading ? invokeFunc(time) : result;\n }\n\n function remainingWait(time) {\n var timeSinceLastCall = time - lastCallTime,\n timeSinceLastInvoke = time - lastInvokeTime,\n timeWaiting = wait - timeSinceLastCall;\n\n return maxing\n ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)\n : timeWaiting;\n }\n\n function shouldInvoke(time) {\n var timeSinceLastCall = time - lastCallTime,\n timeSinceLastInvoke = time - lastInvokeTime;\n\n // Either this is the first call, activity has stopped and we're at the\n // trailing edge, the system time has gone backwards and we're treating\n // it as the trailing edge, or we've hit the `maxWait` limit.\n return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||\n (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));\n }\n\n function timerExpired() {\n var time = now();\n if (shouldInvoke(time)) {\n return trailingEdge(time);\n }\n // Restart the timer.\n timerId = setTimeout(timerExpired, remainingWait(time));\n }\n\n function trailingEdge(time) {\n timerId = undefined;\n\n // Only invoke if we have `lastArgs` which means `func` has been\n // debounced at least once.\n if (trailing && lastArgs) {\n return invokeFunc(time);\n }\n lastArgs = lastThis = undefined;\n return result;\n }\n\n function cancel() {\n if (timerId !== undefined) {\n clearTimeout(timerId);\n }\n lastInvokeTime = 0;\n lastArgs = lastCallTime = lastThis = timerId = undefined;\n }\n\n function flush() {\n return timerId === undefined ? result : trailingEdge(now());\n }\n\n function debounced() {\n var time = now(),\n isInvoking = shouldInvoke(time);\n\n lastArgs = arguments;\n lastThis = this;\n lastCallTime = time;\n\n if (isInvoking) {\n if (timerId === undefined) {\n return leadingEdge(lastCallTime);\n }\n if (maxing) {\n // Handle invocations in a tight loop.\n clearTimeout(timerId);\n timerId = setTimeout(timerExpired, wait);\n return invokeFunc(lastCallTime);\n }\n }\n if (timerId === undefined) {\n timerId = setTimeout(timerExpired, wait);\n }\n return result;\n }\n debounced.cancel = cancel;\n debounced.flush = flush;\n return debounced;\n}\n\nexport default debounce;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/fakeselectionobserver\n */\n\nimport Observer from './observer';\nimport ViewSelection from '../selection';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport { debounce } from 'lodash-es';\n\n/**\n * Fake selection observer class. If view selection is fake it is placed in dummy DOM container. This observer listens\n * on {@link module:engine/view/document~Document#event:keydown keydown} events and handles moving fake view selection to the correct place\n * if arrow keys are pressed.\n * Fires {@link module:engine/view/document~Document#event:selectionChange selectionChange event} simulating natural behaviour of\n * {@link module:engine/view/observer/selectionobserver~SelectionObserver SelectionObserver}.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class FakeSelectionObserver extends Observer {\n\t/**\n\t * Creates new FakeSelectionObserver instance.\n\t *\n\t * @param {module:engine/view/view~View} view\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Fires debounced event `selectionChangeDone`. It uses `lodash#debounce` method to delay function call.\n\t\t *\n\t\t * @private\n\t\t * @param {Object} data Selection change data.\n\t\t * @method #_fireSelectionChangeDoneDebounced\n\t\t */\n\t\tthis._fireSelectionChangeDoneDebounced = debounce( data => this.document.fire( 'selectionChangeDone', data ), 200 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'keydown', ( eventInfo, data ) => {\n\t\t\tconst selection = document.selection;\n\n\t\t\tif ( selection.isFake && _isArrowKeyCode( data.keyCode ) && this.isEnabled ) {\n\t\t\t\t// Prevents default key down handling - no selection change will occur.\n\t\t\t\tdata.preventDefault();\n\n\t\t\t\tthis._handleSelectionMove( data.keyCode );\n\t\t\t}\n\t\t}, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._fireSelectionChangeDoneDebounced.cancel();\n\t}\n\n\t/**\n\t * Handles collapsing view selection according to given key code. If left or up key is provided - new selection will be\n\t * collapsed to left. If right or down key is pressed - new selection will be collapsed to right.\n\t *\n\t * This method fires {@link module:engine/view/document~Document#event:selectionChange} and\n\t * {@link module:engine/view/document~Document#event:selectionChangeDone} events imitating behaviour of\n\t * {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n\t *\n\t * @private\n\t * @param {Number} keyCode\n\t * @fires module:engine/view/document~Document#event:selectionChange\n\t * @fires module:engine/view/document~Document#event:selectionChangeDone\n\t */\n\t_handleSelectionMove( keyCode ) {\n\t\tconst selection = this.document.selection;\n\t\tconst newSelection = new ViewSelection( selection.getRanges(), { backward: selection.isBackward, fake: false } );\n\n\t\t// Left or up arrow pressed - move selection to start.\n\t\tif ( keyCode == keyCodes.arrowleft || keyCode == keyCodes.arrowup ) {\n\t\t\tnewSelection.setTo( newSelection.getFirstPosition() );\n\t\t}\n\n\t\t// Right or down arrow pressed - move selection to end.\n\t\tif ( keyCode == keyCodes.arrowright || keyCode == keyCodes.arrowdown ) {\n\t\t\tnewSelection.setTo( newSelection.getLastPosition() );\n\t\t}\n\n\t\tconst data = {\n\t\t\toldSelection: selection,\n\t\t\tnewSelection,\n\t\t\tdomSelection: null\n\t\t};\n\n\t\t// Fire dummy selection change event.\n\t\tthis.document.fire( 'selectionChange', data );\n\n\t\t// Call` #_fireSelectionChangeDoneDebounced` every time when `selectionChange` event is fired.\n\t\t// This function is debounced what means that `selectionChangeDone` event will be fired only when\n\t\t// defined int the function time will elapse since the last time the function was called.\n\t\t// So `selectionChangeDone` will be fired when selection will stop changing.\n\t\tthis._fireSelectionChangeDoneDebounced( data );\n\t}\n}\n\n// Checks if one of the arrow keys is pressed.\n//\n// @private\n// @param {Number} keyCode\n// @returns {Boolean}\nfunction _isArrowKeyCode( keyCode ) {\n\treturn keyCode == keyCodes.arrowright ||\n\t\tkeyCode == keyCodes.arrowleft ||\n\t\tkeyCode == keyCodes.arrowup ||\n\t\tkeyCode == keyCodes.arrowdown;\n}\n\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/selectionobserver\n */\n\n/* global setInterval, clearInterval */\n\nimport Observer from './observer';\nimport MutationObserver from './mutationobserver';\nimport { debounce } from 'lodash-es';\n\n/**\n * Selection observer class observes selection changes in the document. If selection changes on the document this\n * observer checks if there are any mutations and if DOM selection is different than the\n * {@link module:engine/view/document~Document#selection view selection}. Selection observer fires\n * {@link module:engine/view/document~Document#event:selectionChange} event only if selection change was the only change in the document\n * and DOM selection is different then the view selection.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @see module:engine/view/observer/mutationobserver~MutationObserver\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class SelectionObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Instance of the mutation observer. Selection observer calls\n\t\t * {@link module:engine/view/observer/mutationobserver~MutationObserver#flush} to ensure that the mutations will be handled\n\t\t * before the {@link module:engine/view/document~Document#event:selectionChange} event is fired.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/observer/mutationobserver~MutationObserver}\n\t\t * module:engine/view/observer/selectionobserver~SelectionObserver#mutationObserver\n\t\t */\n\t\tthis.mutationObserver = view.getObserver( MutationObserver );\n\n\t\t/**\n\t\t * Reference to the view {@link module:engine/view/documentselection~DocumentSelection} object used to compare\n\t\t * new selection with it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection}\n\t\t * module:engine/view/observer/selectionobserver~SelectionObserver#selection\n\t\t */\n\t\tthis.selection = this.document.selection;\n\n\t\t/* eslint-disable max-len */\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#domConverter}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter} module:engine/view/observer/selectionobserver~SelectionObserver#domConverter\n\t\t */\n\t\t/* eslint-enable max-len */\n\t\tthis.domConverter = view.domConverter;\n\n\t\t/**\n\t\t * Set of documents which have added \"selectionchange\" listener to avoid adding listener twice to the same\n\t\t * document.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakSet.} module:engine/view/observer/selectionobserver~SelectionObserver#_documents\n\t\t */\n\t\tthis._documents = new WeakSet();\n\n\t\t/**\n\t\t * Fires debounced event `selectionChangeDone`. It uses `lodash#debounce` method to delay function call.\n\t\t *\n\t\t * @private\n\t\t * @param {Object} data Selection change data.\n\t\t * @method #_fireSelectionChangeDoneDebounced\n\t\t */\n\t\tthis._fireSelectionChangeDoneDebounced = debounce( data => this.document.fire( 'selectionChangeDone', data ), 200 );\n\n\t\tthis._clearInfiniteLoopInterval = setInterval( () => this._clearInfiniteLoop(), 1000 );\n\n\t\t/**\n\t\t * Private property to check if the code does not enter infinite loop.\n\t\t *\n\t\t * @private\n\t\t * @member {Number} module:engine/view/observer/selectionobserver~SelectionObserver#_loopbackCounter\n\t\t */\n\t\tthis._loopbackCounter = 0;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tconst domDocument = domElement.ownerDocument;\n\n\t\t// Add listener once per each document.\n\t\tif ( this._documents.has( domDocument ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.listenTo( domDocument, 'selectionchange', () => {\n\t\t\tthis._handleSelectionChange( domDocument );\n\t\t} );\n\n\t\tthis._documents.add( domDocument );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tclearInterval( this._clearInfiniteLoopInterval );\n\t\tthis._fireSelectionChangeDoneDebounced.cancel();\n\t}\n\n\t/**\n\t * Selection change listener. {@link module:engine/view/observer/mutationobserver~MutationObserver#flush Flush} mutations, check if\n\t * selection changes and fires {@link module:engine/view/document~Document#event:selectionChange} event on every change\n\t * and {@link module:engine/view/document~Document#event:selectionChangeDone} when selection stop changing.\n\t *\n\t * @private\n\t * @param {Document} domDocument DOM document.\n\t */\n\t_handleSelectionChange( domDocument ) {\n\t\tif ( !this.isEnabled ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Ensure the mutation event will be before selection event on all browsers.\n\t\tthis.mutationObserver.flush();\n\n\t\t// If there were mutations then the view will be re-rendered by the mutation observer and selection\n\t\t// will be updated, so selections will equal and event will not be fired, as expected.\n\t\tconst domSelection = domDocument.defaultView.getSelection();\n\t\tconst newViewSelection = this.domConverter.domSelectionToView( domSelection );\n\n\t\t// Do not convert selection change if the new view selection has no ranges in it.\n\t\t//\n\t\t// It means that the DOM selection is in some way incorrect. Ranges that were in the DOM selection could not be\n\t\t// converted to the view. This happens when the DOM selection was moved outside of the editable element.\n\t\tif ( newViewSelection.rangeCount == 0 ) {\n\t\t\tthis.view.hasDomSelection = false;\n\n\t\t\treturn;\n\t\t}\n\n\t\tthis.view.hasDomSelection = true;\n\n\t\tif ( this.selection.isEqual( newViewSelection ) && this.domConverter.isDomSelectionCorrect( domSelection ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Ensure we are not in the infinite loop (#400).\n\t\t// This counter is reset each second. 60 selection changes in 1 second is enough high number\n\t\t// to be very difficult (impossible) to achieve using just keyboard keys (during normal editor use).\n\t\tif ( ++this._loopbackCounter > 60 ) {\n\t\t\t// Selection change observer detected an infinite rendering loop.\n\t\t\t// Most probably you try to put the selection in the position which is not allowed\n\t\t\t// by the browser and browser fixes it automatically what causes `selectionchange` event on\n\t\t\t// which a loopback through a model tries to re-render the wrong selection and again.\n\t\t\t//\n\t\t\t// @if CK_DEBUG // console.warn( 'Selection change observer detected an infinite rendering loop.' );\n\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this.selection.isSimilar( newViewSelection ) ) {\n\t\t\t// If selection was equal and we are at this point of algorithm, it means that it was incorrect.\n\t\t\t// Just re-render it, no need to fire any events, etc.\n\t\t\tthis.view.forceRender();\n\t\t} else {\n\t\t\tconst data = {\n\t\t\t\toldSelection: this.selection,\n\t\t\t\tnewSelection: newViewSelection,\n\t\t\t\tdomSelection\n\t\t\t};\n\n\t\t\t// Prepare data for new selection and fire appropriate events.\n\t\t\tthis.document.fire( 'selectionChange', data );\n\n\t\t\t// Call` #_fireSelectionChangeDoneDebounced` every time when `selectionChange` event is fired.\n\t\t\t// This function is debounced what means that `selectionChangeDone` event will be fired only when\n\t\t\t// defined int the function time will elapse since the last time the function was called.\n\t\t\t// So `selectionChangeDone` will be fired when selection will stop changing.\n\t\t\tthis._fireSelectionChangeDoneDebounced( data );\n\t\t}\n\t}\n\n\t/**\n\t * Clears `SelectionObserver` internal properties connected with preventing infinite loop.\n\t *\n\t * @protected\n\t */\n\t_clearInfiniteLoop() {\n\t\tthis._loopbackCounter = 0;\n\t}\n}\n\n/**\n * Fired when selection has changed. This event is fired only when the selection change was the only change that happened\n * in the document, and old selection is different then the new selection.\n *\n * Introduced by {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n *\n * Note that because {@link module:engine/view/observer/selectionobserver~SelectionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/selectionobserver~SelectionObserver\n * @event module:engine/view/document~Document#event:selectionChange\n * @param {Object} data\n * @param {module:engine/view/documentselection~DocumentSelection} data.oldSelection Old View selection which is\n * {@link module:engine/view/document~Document#selection}.\n * @param {module:engine/view/selection~Selection} data.newSelection New View selection which is converted DOM selection.\n * @param {Selection} data.domSelection Native DOM selection.\n */\n\n/**\n * Fired when selection stops changing.\n *\n * Introduced by {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n *\n * Note that because {@link module:engine/view/observer/selectionobserver~SelectionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/selectionobserver~SelectionObserver\n * @event module:engine/view/document~Document#event:selectionChangeDone\n * @param {Object} data\n * @param {module:engine/view/documentselection~DocumentSelection} data.oldSelection Old View selection which is\n * {@link module:engine/view/document~Document#selection}.\n * @param {module:engine/view/selection~Selection} data.newSelection New View selection which is converted DOM selection.\n * @param {Selection} data.domSelection Native DOM selection.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/focusobserver\n */\n\n/* globals setTimeout, clearTimeout */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:focus Focus}\n * and {@link module:engine/view/document~Document#event:blur blur} events observer.\n * Focus observer handle also {@link module:engine/view/rooteditableelement~RootEditableElement#isFocused isFocused} property of the\n * {@link module:engine/view/rooteditableelement~RootEditableElement root elements}.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class FocusObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'focus', 'blur' ];\n\t\tthis.useCapture = true;\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'focus', () => {\n\t\t\tdocument.isFocused = true;\n\n\t\t\t// Unfortunately native `selectionchange` event is fired asynchronously.\n\t\t\t// We need to wait until `SelectionObserver` handle the event and then render. Otherwise rendering will\n\t\t\t// overwrite new DOM selection with selection from the view.\n\t\t\t// See https://github.com/ckeditor/ckeditor5-engine/issues/795 for more details.\n\t\t\t// Long timeout is needed to solve #676 and https://github.com/ckeditor/ckeditor5-engine/issues/1157 issues.\n\t\t\tthis._renderTimeoutId = setTimeout( () => view.forceRender(), 50 );\n\t\t} );\n\n\t\tdocument.on( 'blur', ( evt, data ) => {\n\t\t\tconst selectedEditable = document.selection.editableElement;\n\n\t\t\tif ( selectedEditable === null || selectedEditable === data.target ) {\n\t\t\t\tdocument.isFocused = false;\n\n\t\t\t\t// Re-render the document to update view elements.\n\t\t\t\tview.forceRender();\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * Identifier of the timeout currently used by focus listener to delay rendering execution.\n\t\t *\n\t\t * @private\n\t\t * @member {Number} #_renderTimeoutId\n\t\t */\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tif ( this._renderTimeoutId ) {\n\t\t\tclearTimeout( this._renderTimeoutId );\n\t\t}\n\n\t\tsuper.destroy();\n\t}\n}\n\n/**\n * Fired when one of the editables gets focus.\n *\n * Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.\n *\n * Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/focusobserver~FocusObserver\n * @event module:engine/view/document~Document#event:focus\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when one of the editables loses focus.\n *\n * Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.\n *\n * Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/focusobserver~FocusObserver\n * @event module:engine/view/document~Document#event:blur\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/compositionobserver\n */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:compositionstart Compositionstart},\n * {@link module:engine/view/document~Document#event:compositionupdate compositionupdate} and\n * {@link module:engine/view/document~Document#event:compositionend compositionend} events observer.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class CompositionObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'compositionstart', 'compositionupdate', 'compositionend' ];\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'compositionstart', () => {\n\t\t\tdocument.isComposing = true;\n\t\t} );\n\n\t\tdocument.on( 'compositionend', () => {\n\t\t\tdocument.isComposing = false;\n\t\t} );\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n\n/**\n * Fired when composition starts inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionstart\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when composition is updated inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionupdate\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when composition ends inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionend\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/inputobserver\n */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * Observer for events connected with data input.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class InputObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'beforeinput' ];\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n\n/**\n * Fired before browser inputs (or deletes) some data.\n *\n * This event is available only on browsers which support DOM `beforeinput` event.\n *\n * Introduced by {@link module:engine/view/observer/inputobserver~InputObserver}.\n *\n * Note that because {@link module:engine/view/observer/inputobserver~InputObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/inputobserver~InputObserver\n * @event module:engine/view/document~Document#event:beforeinput\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/isrange\n */\n\n/**\n * Checks if the object is a native DOM Range.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isRange( obj ) {\n\treturn Object.prototype.toString.apply( obj ) == '[object Range]';\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/getborderwidths\n */\n\n/**\n * Returns an object containing CSS border widths of a specified HTML element.\n *\n * @param {HTMLElement} element An element which has CSS borders.\n * @returns {Object} An object containing `top`, `left`, `right` and `bottom` properties\n * with numerical values of the `border-[top,left,right,bottom]-width` CSS styles.\n */\nexport default function getBorderWidths( element ) {\n\t// Call getComputedStyle on the window the element document belongs to.\n\tconst style = element.ownerDocument.defaultView.getComputedStyle( element );\n\n\treturn {\n\t\ttop: parseInt( style.borderTopWidth, 10 ),\n\t\tright: parseInt( style.borderRightWidth, 10 ),\n\t\tbottom: parseInt( style.borderBottomWidth, 10 ),\n\t\tleft: parseInt( style.borderLeftWidth, 10 )\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/rect\n */\n\nimport isRange from './isrange';\nimport isWindow from './iswindow';\nimport getBorderWidths from './getborderwidths';\nimport isText from './istext';\nimport { isElement } from 'lodash-es';\n\nconst rectProperties = [ 'top', 'right', 'bottom', 'left', 'width', 'height' ];\n\n/**\n * A helper class representing a `ClientRect` object, e.g. value returned by\n * the native `object.getBoundingClientRect()` method. Provides a set of methods\n * to manipulate the rect and compare it against other rect instances.\n */\nexport default class Rect {\n\t/**\n\t * Creates an instance of rect.\n\t *\n\t *\t\t// Rect of an HTMLElement.\n\t *\t\tconst rectA = new Rect( document.body );\n\t *\n\t *\t\t// Rect of a DOM Range.\n\t *\t\tconst rectB = new Rect( document.getSelection().getRangeAt( 0 ) );\n\t *\n\t *\t\t// Rect of a window (web browser viewport).\n\t *\t\tconst rectC = new Rect( window );\n\t *\n\t *\t\t// Rect out of an object.\n\t *\t\tconst rectD = new Rect( { top: 0, right: 10, bottom: 10, left: 0, width: 10, height: 10 } );\n\t *\n\t *\t\t// Rect out of another Rect instance.\n\t *\t\tconst rectE = new Rect( rectD );\n\t *\n\t *\t\t// Rect out of a ClientRect.\n\t *\t\tconst rectF = new Rect( document.body.getClientRects().item( 0 ) );\n\t *\n\t * **Note**: By default a rect of an HTML element includes its CSS borders and scrollbars (if any)\n\t * ant the rect of a `window` includes scrollbars too. Use {@link #excludeScrollbarsAndBorders}\n\t * to get the inner part of the rect.\n\t *\n\t * @param {HTMLElement|Range|Window|ClientRect|module:utils/dom/rect~Rect|Object} source A source object to create the rect.\n\t */\n\tconstructor( source ) {\n\t\tconst isSourceRange = isRange( source );\n\n\t\t/**\n\t\t * The object this rect is for.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @member {HTMLElement|Range|ClientRect|module:utils/dom/rect~Rect|Object} #_source\n\t\t */\n\t\tObject.defineProperty( this, '_source', {\n\t\t\t// If the source is a Rect instance, copy it's #_source.\n\t\t\tvalue: source._source || source,\n\t\t\twritable: true,\n\t\t\tenumerable: false\n\t\t} );\n\n\t\tif ( isElement( source ) || isSourceRange ) {\n\t\t\t// The `Rect` class depends on `getBoundingClientRect` and `getClientRects` DOM methods. If the source\n\t\t\t// of a rect in an HTML element or a DOM range but it does not belong to any rendered DOM tree, these methods\n\t\t\t// will fail to obtain the geometry and the rect instance makes little sense to the features using it.\n\t\t\t// To get rid of this warning make sure the source passed to the constructor is a descendant of `window.document.body`.\n\t\t\t// @if CK_DEBUG // const sourceNode = isSourceRange ? source.startContainer : source;\n\t\t\t// @if CK_DEBUG // if ( !sourceNode.ownerDocument || !sourceNode.ownerDocument.body.contains( sourceNode ) ) {\n\t\t\t// @if CK_DEBUG // \tconsole.warn(\n\t\t\t// @if CK_DEBUG // \t\t'rect-source-not-in-dom: The source of this rect does not belong to any rendered DOM tree.',\n\t\t\t// @if CK_DEBUG // \t\t{ source } );\n\t\t\t// @if CK_DEBUG // }\n\n\t\t\tif ( isSourceRange ) {\n\t\t\t\tconst rangeRects = Rect.getDomRangeRects( source );\n\t\t\t\tcopyRectProperties( this, Rect.getBoundingRect( rangeRects ) );\n\t\t\t} else {\n\t\t\t\tcopyRectProperties( this, source.getBoundingClientRect() );\n\t\t\t}\n\t\t} else if ( isWindow( source ) ) {\n\t\t\tconst { innerWidth, innerHeight } = source;\n\n\t\t\tcopyRectProperties( this, {\n\t\t\t\ttop: 0,\n\t\t\t\tright: innerWidth,\n\t\t\t\tbottom: innerHeight,\n\t\t\t\tleft: 0,\n\t\t\t\twidth: innerWidth,\n\t\t\t\theight: innerHeight\n\t\t\t} );\n\t\t} else {\n\t\t\tcopyRectProperties( this, source );\n\t\t}\n\n\t\t/**\n\t\t * The \"top\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #top\n\t\t */\n\n\t\t/**\n\t\t * The \"right\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #right\n\t\t */\n\n\t\t/**\n\t\t * The \"bottom\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #bottom\n\t\t */\n\n\t\t/**\n\t\t * The \"left\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #left\n\t\t */\n\n\t\t/**\n\t\t * The \"width\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #width\n\t\t */\n\n\t\t/**\n\t\t * The \"height\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #height\n\t\t */\n\t}\n\n\t/**\n\t * Returns a clone of the rect.\n\t *\n\t * @returns {module:utils/dom/rect~Rect} A cloned rect.\n\t */\n\tclone() {\n\t\treturn new Rect( this );\n\t}\n\n\t/**\n\t * Moves the rect so that its upper–left corner lands in desired `[ x, y ]` location.\n\t *\n\t * @param {Number} x Desired horizontal location.\n\t * @param {Number} y Desired vertical location.\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been moved.\n\t */\n\tmoveTo( x, y ) {\n\t\tthis.top = y;\n\t\tthis.right = x + this.width;\n\t\tthis.bottom = y + this.height;\n\t\tthis.left = x;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves the rect in–place by a dedicated offset.\n\t *\n\t * @param {Number} x A horizontal offset.\n\t * @param {Number} y A vertical offset\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been moved.\n\t */\n\tmoveBy( x, y ) {\n\t\tthis.top += y;\n\t\tthis.right += x;\n\t\tthis.left += x;\n\t\tthis.bottom += y;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns a new rect a a result of intersection with another rect.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect\n\t * @returns {module:utils/dom/rect~Rect}\n\t */\n\tgetIntersection( anotherRect ) {\n\t\tconst rect = {\n\t\t\ttop: Math.max( this.top, anotherRect.top ),\n\t\t\tright: Math.min( this.right, anotherRect.right ),\n\t\t\tbottom: Math.min( this.bottom, anotherRect.bottom ),\n\t\t\tleft: Math.max( this.left, anotherRect.left )\n\t\t};\n\n\t\trect.width = rect.right - rect.left;\n\t\trect.height = rect.bottom - rect.top;\n\n\t\tif ( rect.width < 0 || rect.height < 0 ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\treturn new Rect( rect );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the area of intersection with another rect.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect [description]\n\t * @returns {Number} Area of intersection.\n\t */\n\tgetIntersectionArea( anotherRect ) {\n\t\tconst rect = this.getIntersection( anotherRect );\n\n\t\tif ( rect ) {\n\t\t\treturn rect.getArea();\n\t\t} else {\n\t\t\treturn 0;\n\t\t}\n\t}\n\n\t/**\n\t * Returns the area of the rect.\n\t *\n\t * @returns {Number}\n\t */\n\tgetArea() {\n\t\treturn this.width * this.height;\n\t}\n\n\t/**\n\t * Returns a new rect, a part of the original rect, which is actually visible to the user,\n\t * e.g. an original rect cropped by parent element rects which have `overflow` set in CSS\n\t * other than `\"visible\"`.\n\t *\n\t * If there's no such visible rect, which is when the rect is limited by one or many of\n\t * the ancestors, `null` is returned.\n\t *\n\t * @returns {module:utils/dom/rect~Rect|null} A visible rect instance or `null`, if there's none.\n\t */\n\tgetVisible() {\n\t\tconst source = this._source;\n\t\tlet visibleRect = this.clone();\n\n\t\t// There's no ancestor to crop with the overflow.\n\t\tif ( !isBody( source ) ) {\n\t\t\tlet parent = source.parentNode || source.commonAncestorContainer;\n\n\t\t\t// Check the ancestors all the way up to the .\n\t\t\twhile ( parent && !isBody( parent ) ) {\n\t\t\t\tconst parentRect = new Rect( parent );\n\t\t\t\tconst intersectionRect = visibleRect.getIntersection( parentRect );\n\n\t\t\t\tif ( intersectionRect ) {\n\t\t\t\t\tif ( intersectionRect.getArea() < visibleRect.getArea() ) {\n\t\t\t\t\t\t// Reduce the visible rect to the intersection.\n\t\t\t\t\t\tvisibleRect = intersectionRect;\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\t// There's no intersection, the rect is completely invisible.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tparent = parent.parentNode;\n\t\t\t}\n\t\t}\n\n\t\treturn visibleRect;\n\t}\n\n\t/**\n\t * Checks if all property values ({@link #top}, {@link #left}, {@link #right},\n\t * {@link #bottom}, {@link #width} and {@link #height}) are the equal in both rect\n\t * instances.\n\t *\n\t * @param {module:utils/dom/rect~Rect} rect A rect instance to compare with.\n\t * @returns {Boolean} `true` when Rects are equal. `false` otherwise.\n\t */\n\tisEqual( anotherRect ) {\n\t\tfor ( const prop of rectProperties ) {\n\t\t\tif ( this[ prop ] !== anotherRect[ prop ] ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether a rect fully contains another rect instance.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect\n\t * @returns {Boolean} `true` if contains, `false` otherwise.\n\t */\n\tcontains( anotherRect ) {\n\t\tconst intersectRect = this.getIntersection( anotherRect );\n\n\t\treturn !!( intersectRect && intersectRect.isEqual( anotherRect ) );\n\t}\n\n\t/**\n\t * Excludes scrollbars and CSS borders from the rect.\n\t *\n\t * * Borders are removed when {@link #_source} is an HTML element.\n\t * * Scrollbars are excluded from HTML elements and the `window`.\n\t *\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been updated.\n\t */\n\texcludeScrollbarsAndBorders() {\n\t\tconst source = this._source;\n\t\tlet scrollBarWidth, scrollBarHeight, direction;\n\n\t\tif ( isWindow( source ) ) {\n\t\t\tscrollBarWidth = source.innerWidth - source.document.documentElement.clientWidth;\n\t\t\tscrollBarHeight = source.innerHeight - source.document.documentElement.clientHeight;\n\t\t\tdirection = source.getComputedStyle( source.document.documentElement ).direction;\n\t\t} else {\n\t\t\tconst borderWidths = getBorderWidths( this._source );\n\n\t\t\tscrollBarWidth = source.offsetWidth - source.clientWidth - borderWidths.left - borderWidths.right;\n\t\t\tscrollBarHeight = source.offsetHeight - source.clientHeight - borderWidths.top - borderWidths.bottom;\n\t\t\tdirection = source.ownerDocument.defaultView.getComputedStyle( source ).direction;\n\n\t\t\tthis.left += borderWidths.left;\n\t\t\tthis.top += borderWidths.top;\n\t\t\tthis.right -= borderWidths.right;\n\t\t\tthis.bottom -= borderWidths.bottom;\n\t\t\tthis.width = this.right - this.left;\n\t\t\tthis.height = this.bottom - this.top;\n\t\t}\n\n\t\tthis.width -= scrollBarWidth;\n\n\t\tif ( direction === 'ltr' ) {\n\t\t\tthis.right -= scrollBarWidth;\n\t\t} else {\n\t\t\tthis.left += scrollBarWidth;\n\t\t}\n\n\t\tthis.height -= scrollBarHeight;\n\t\tthis.bottom -= scrollBarHeight;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of rects of the given native DOM Range.\n\t *\n\t * @param {Range} range A native DOM range.\n\t * @returns {Array.} DOM Range rects.\n\t */\n\tstatic getDomRangeRects( range ) {\n\t\tconst rects = [];\n\t\t// Safari does not iterate over ClientRectList using for...of loop.\n\t\tconst clientRects = Array.from( range.getClientRects() );\n\n\t\tif ( clientRects.length ) {\n\t\t\tfor ( const rect of clientRects ) {\n\t\t\t\trects.push( new Rect( rect ) );\n\t\t\t}\n\t\t}\n\t\t// If there's no client rects for the Range, use parent container's bounding rect\n\t\t// instead and adjust rect's width to simulate the actual geometry of such range.\n\t\t// https://github.com/ckeditor/ckeditor5-utils/issues/153\n\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/317\n\t\telse {\n\t\t\tlet startContainer = range.startContainer;\n\n\t\t\tif ( isText( startContainer ) ) {\n\t\t\t\tstartContainer = startContainer.parentNode;\n\t\t\t}\n\n\t\t\tconst rect = new Rect( startContainer.getBoundingClientRect() );\n\t\t\trect.right = rect.left;\n\t\t\trect.width = 0;\n\n\t\t\trects.push( rect );\n\t\t}\n\n\t\treturn rects;\n\t}\n\n\t/**\n\t * Returns a bounding rectangle that contains all the given `rects`.\n\t *\n\t * @param {Iterable.} rects A list of rectangles that should be contained in the result rectangle.\n\t * @returns {module:utils/dom/rect~Rect|null} Bounding rectangle or `null` if no `rects` were given.\n\t */\n\tstatic getBoundingRect( rects ) {\n\t\tconst boundingRectData = {\n\t\t\tleft: Number.POSITIVE_INFINITY,\n\t\t\ttop: Number.POSITIVE_INFINITY,\n\t\t\tright: Number.NEGATIVE_INFINITY,\n\t\t\tbottom: Number.NEGATIVE_INFINITY\n\t\t};\n\t\tlet rectangleCount = 0;\n\n\t\tfor ( const rect of rects ) {\n\t\t\trectangleCount++;\n\n\t\t\tboundingRectData.left = Math.min( boundingRectData.left, rect.left );\n\t\t\tboundingRectData.top = Math.min( boundingRectData.top, rect.top );\n\t\t\tboundingRectData.right = Math.max( boundingRectData.right, rect.right );\n\t\t\tboundingRectData.bottom = Math.max( boundingRectData.bottom, rect.bottom );\n\t\t}\n\n\t\tif ( rectangleCount == 0 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tboundingRectData.width = boundingRectData.right - boundingRectData.left;\n\t\tboundingRectData.height = boundingRectData.bottom - boundingRectData.top;\n\n\t\treturn new Rect( boundingRectData );\n\t}\n}\n\n// Acquires all the rect properties from the passed source.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} rect\n// @param {ClientRect|module:utils/dom/rect~Rect|Object} source\nfunction copyRectProperties( rect, source ) {\n\tfor ( const p of rectProperties ) {\n\t\trect[ p ] = source[ p ];\n\t}\n}\n\n// Checks if provided object is a HTML element.\n//\n// @private\n// @param {HTMLElement|Range} elementOrRange\n// @returns {Boolean}\nfunction isBody( elementOrRange ) {\n\tif ( !isElement( elementOrRange ) ) {\n\t\treturn false;\n\t}\n\n\treturn elementOrRange === elementOrRange.ownerDocument.body;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/scroll\n */\n\nimport isRange from './isrange';\nimport Rect from './rect';\nimport isText from './istext';\n\nconst utils = {};\n\n/**\n * Makes any page `HTMLElement` or `Range` (`target`) visible inside the browser viewport.\n * This helper will scroll all `target` ancestors and the web browser viewport to reveal the target to\n * the user. If the `target` is already visible, nothing will happen.\n *\n * @param {HTMLElement|Range} options.target A target, which supposed to become visible to the user.\n * @param {Number} [options.viewportOffset] An offset from the edge of the viewport (in pixels)\n * the `target` will be moved by when the viewport is scrolled. It enhances the user experience\n * by keeping the `target` some distance from the edge of the viewport and thus making it easier to\n * read or edit by the user.\n */\nexport function scrollViewportToShowTarget( { target, viewportOffset = 0 } ) {\n\tconst targetWindow = getWindow( target );\n\tlet currentWindow = targetWindow;\n\tlet currentFrame = null;\n\n\t// Iterate over all windows, starting from target's parent window up to window#top.\n\twhile ( currentWindow ) {\n\t\tlet firstAncestorToScroll;\n\n\t\t// Let's scroll target's ancestors first to reveal it. Then, once the ancestor scrolls\n\t\t// settled down, the algorithm can eventually scroll the viewport of the current window.\n\t\t//\n\t\t// Note: If the current window is target's **original** window (e.g. the first one),\n\t\t// start scrolling the closest parent of the target. If not, scroll the closest parent\n\t\t// of an iframe that resides in the current window.\n\t\tif ( currentWindow == targetWindow ) {\n\t\t\tfirstAncestorToScroll = getParentElement( target );\n\t\t} else {\n\t\t\tfirstAncestorToScroll = getParentElement( currentFrame );\n\t\t}\n\n\t\t// Scroll the target's ancestors first. Once done, scrolling the viewport is easy.\n\t\tscrollAncestorsToShowRect( firstAncestorToScroll, () => {\n\t\t\t// Note: If the target does not belong to the current window **directly**,\n\t\t\t// i.e. it resides in an iframe belonging to the window, obtain the target's rect\n\t\t\t// in the coordinates of the current window. By default, a Rect returns geometry\n\t\t\t// relative to the current window's viewport. To make it work in a parent window,\n\t\t\t// it must be shifted.\n\t\t\treturn getRectRelativeToWindow( target, currentWindow );\n\t\t} );\n\n\t\t// Obtain the rect of the target after it has been scrolled within its ancestors.\n\t\t// It's time to scroll the viewport.\n\t\tconst targetRect = getRectRelativeToWindow( target, currentWindow );\n\n\t\tscrollWindowToShowRect( currentWindow, targetRect, viewportOffset );\n\n\t\tif ( currentWindow.parent != currentWindow ) {\n\t\t\t// Keep the reference to the