mirror of
https://github.com/the-djmaze/snappymail.git
synced 2024-11-10 09:02:45 +08:00
Added turndown.js for #1604
This commit is contained in:
the-djmaze
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commit
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1 changed files with 861 additions and 0 deletions
861
vendors/turndown/turndown.js
vendored
Normal file
861
vendors/turndown/turndown.js
vendored
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/**
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* https://github.com/mixmark-io/turndown
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* v7.2.0 modified by SnappyMail to be ES2020
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*/
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const TurndownService = (() => {
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'use strict';
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const repeat = (character, count) => Array(count + 1).join(character),
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trimLeadingNewlines = string => string.replace(/^\n*/, ''),
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trimTrailingNewlines = string => {
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// avoid match-at-end regexp bottleneck, see #370
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var indexEnd = string.length;
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while (indexEnd > 0 && string[indexEnd - 1] === '\n') indexEnd--;
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return string.substring(0, indexEnd)
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},
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blockElements = [
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'ADDRESS', 'ARTICLE', 'ASIDE', 'AUDIO', 'BLOCKQUOTE', 'BODY', 'CANVAS',
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'CENTER', 'DD', 'DIR', 'DIV', 'DL', 'DT', 'FIELDSET', 'FIGCAPTION', 'FIGURE',
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'FOOTER', 'FORM', 'FRAMESET', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'HEADER',
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'HGROUP', 'HR', 'HTML', 'ISINDEX', 'LI', 'MAIN', 'MENU', 'NAV', 'NOFRAMES',
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'NOSCRIPT', 'OL', 'OUTPUT', 'P', 'PRE', 'SECTION', 'TABLE', 'TBODY', 'TD',
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'TFOOT', 'TH', 'THEAD', 'TR', 'UL'
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],
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isBlock = node => is(node, blockElements),
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voidElements = [
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'AREA', 'BASE', 'BR', 'COL', 'COMMAND', 'EMBED', 'HR', 'IMG', 'INPUT',
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'KEYGEN', 'LINK', 'META', 'PARAM', 'SOURCE', 'TRACK', 'WBR'
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],
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isVoid = node => is(node, voidElements),
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hasVoid = node => has(node, voidElements),
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meaningfulWhenBlankElements = [
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'A', 'TABLE', 'THEAD', 'TBODY', 'TFOOT', 'TH', 'TD', 'IFRAME', 'SCRIPT',
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'AUDIO', 'VIDEO'
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],
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isMeaningfulWhenBlank = node => is(node, meaningfulWhenBlankElements),
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hasMeaningfulWhenBlank = node => has(node, meaningfulWhenBlankElements),
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is = (node, tagNames) => tagNames.indexOf(node.nodeName) >= 0,
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has = (node, tagNames) =>
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(
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node.getElementsByTagName &&
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tagNames.some(tagName => node.getElementsByTagName(tagName).length)
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),
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rules = {
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paragraph: {
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filter: 'p',
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replacement: content => '\n\n' + content + '\n\n'
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},
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lineBreak: {
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filter: 'br',
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replacement: (content, node, options) => options.br + '\n'
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},
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heading: {
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filter: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'],
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replacement: (content, node, options) => {
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var hLevel = Number(node.nodeName.charAt(1));
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if (options.headingStyle === 'setext' && hLevel < 3) {
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var underline = repeat((hLevel === 1 ? '=' : '-'), content.length);
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return '\n\n' + content + '\n' + underline + '\n\n'
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}
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return '\n\n' + repeat('#', hLevel) + ' ' + content + '\n\n'
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}
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},
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blockquote: {
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filter: 'blockquote',
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replacement: (content) => {
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content = content.replace(/^\n+|\n+$/g, '');
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content = content.replace(/^/gm, '> ');
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return '\n\n' + content + '\n\n'
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}
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},
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list: {
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filter: ['ul', 'ol'],
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replacement: (content, node) => {
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var parent = node.parentNode;
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if (parent.nodeName === 'LI' && parent.lastElementChild === node) {
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return '\n' + content
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}
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return '\n\n' + content + '\n\n'
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}
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},
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listItem: {
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filter: 'li',
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replacement: (content, node, options) => {
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content = content
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.replace(/^\n+/, '') // remove leading newlines
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.replace(/\n+$/, '\n') // replace trailing newlines with just a single one
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.replace(/\n/gm, '\n '); // indent
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var prefix = options.bulletListMarker + ' ';
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var parent = node.parentNode;
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if (parent.nodeName === 'OL') {
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var start = parent.getAttribute('start');
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var index = Array.prototype.indexOf.call(parent.children, node);
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prefix = (start ? Number(start) + index : index + 1) + '. ';
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}
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return (
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prefix + content + (node.nextSibling && !/\n$/.test(content) ? '\n' : '')
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)
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}
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},
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indentedCodeBlock: {
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filter: (node, options) =>
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(
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options.codeBlockStyle === 'indented' &&
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node.nodeName === 'PRE' &&
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node.firstChild &&
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node.firstChild.nodeName === 'CODE'
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)
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,
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replacement: (content, node) =>
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(
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'\n\n ' +
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node.firstChild.textContent.replace(/\n/g, '\n ') +
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'\n\n'
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)
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},
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fencedCodeBlock: {
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filter: (node, options) =>
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(
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options.codeBlockStyle === 'fenced' &&
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node.nodeName === 'PRE' &&
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node.firstChild &&
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node.firstChild.nodeName === 'CODE'
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)
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,
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replacement: (content, node, options) => {
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var className = node.firstChild.getAttribute('class') || '';
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var language = (className.match(/language-(\S+)/) || [null, ''])[1];
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var code = node.firstChild.textContent;
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var fenceChar = options.fence.charAt(0);
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var fenceSize = 3;
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var fenceInCodeRegex = new RegExp('^' + fenceChar + '{3,}', 'gm');
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var match;
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while ((match = fenceInCodeRegex.exec(code))) {
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if (match[0].length >= fenceSize) {
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fenceSize = match[0].length + 1;
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}
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}
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var fence = repeat(fenceChar, fenceSize);
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return (
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'\n\n' + fence + language + '\n' +
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code.replace(/\n$/, '') +
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'\n' + fence + '\n\n'
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)
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}
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},
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horizontalRule: {
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filter: 'hr',
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replacement: (content, node, options) => '\n\n' + options.hr + '\n\n'
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},
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inlineLink: {
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filter: (node, options) =>
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(
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options.linkStyle === 'inlined' &&
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node.nodeName === 'A' &&
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node.getAttribute('href')
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)
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,
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replacement: (content, node) => {
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var href = node.getAttribute('href');
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if (href) href = href.replace(/([()])/g, '\\$1');
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var title = cleanAttribute(node.getAttribute('title'));
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if (title) title = ' "' + title.replace(/"/g, '\\"') + '"';
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return '[' + content + '](' + href + title + ')'
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}
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},
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referenceLink: {
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filter: (node, options) =>
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(
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options.linkStyle === 'referenced' &&
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node.nodeName === 'A' &&
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node.getAttribute('href')
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)
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,
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replacement: function (content, node, options) {
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var href = node.getAttribute('href');
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var title = cleanAttribute(node.getAttribute('title'));
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if (title) title = ' "' + title + '"';
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var replacement;
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var reference;
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switch (options.linkReferenceStyle) {
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case 'collapsed':
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replacement = '[' + content + '][]';
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reference = '[' + content + ']: ' + href + title;
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break
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case 'shortcut':
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replacement = '[' + content + ']';
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reference = '[' + content + ']: ' + href + title;
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break
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default:
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var id = this.references.length + 1;
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replacement = '[' + content + '][' + id + ']';
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reference = '[' + id + ']: ' + href + title;
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}
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this.references.push(reference);
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return replacement
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},
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references: [],
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append: function () {
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var references = '';
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if (this.references.length) {
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references = '\n\n' + this.references.join('\n') + '\n\n';
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this.references = []; // Reset references
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}
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return references
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}
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},
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emphasis: {
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filter: ['em', 'i'],
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replacement: (content, node, options) => {
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if (!content.trim()) return ''
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return options.emDelimiter + content + options.emDelimiter
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}
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},
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strong: {
|
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filter: ['strong', 'b'],
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replacement: (content, node, options) => {
|
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if (!content.trim()) return ''
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return options.strongDelimiter + content + options.strongDelimiter
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}
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},
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code: {
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filter: (node) => {
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var hasSiblings = node.previousSibling || node.nextSibling;
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var isCodeBlock = node.parentNode.nodeName === 'PRE' && !hasSiblings;
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return node.nodeName === 'CODE' && !isCodeBlock
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},
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replacement: (content) => {
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if (!content) return ''
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content = content.replace(/\r?\n|\r/g, ' ');
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var extraSpace = /^`|^ .*?[^ ].* $|`$/.test(content) ? ' ' : '';
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var delimiter = '`';
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var matches = content.match(/`+/gm) || [];
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while (matches.indexOf(delimiter) !== -1) delimiter = delimiter + '`';
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return delimiter + extraSpace + content + extraSpace + delimiter
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}
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},
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image: {
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filter: 'img',
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replacement: (content, node) => {
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var alt = cleanAttribute(node.getAttribute('alt'));
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var src = node.getAttribute('src') || '';
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var title = cleanAttribute(node.getAttribute('title'));
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var titlePart = title ? ' "' + title + '"' : '';
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return src ? '![' + alt + ']' + '(' + src + titlePart + ')' : ''
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}
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}
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},
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cleanAttribute = (attribute) => attribute ? attribute.replace(/(\n+\s*)+/g, '\n') : '';
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/**
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* Manages a collection of rules used to convert HTML to Markdown
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*/
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class Rules
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{
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constructor(options) {
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this.options = options;
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this._keep = [];
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this._remove = [];
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this.blankRule = {
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replacement: options.blankReplacement
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};
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this.keepReplacement = options.keepReplacement;
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this.defaultRule = {
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replacement: options.defaultReplacement
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};
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this.array = [];
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for (var key in options.rules) this.array.push(options.rules[key]);
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}
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add(key, rule) {
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this.array.unshift(rule);
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}
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keep(filter) {
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this._keep.unshift({
|
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filter: filter,
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replacement: this.keepReplacement
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});
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}
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remove(filter) {
|
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this._remove.unshift({
|
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filter: filter,
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replacement: () => ''
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});
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}
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forNode(node) {
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if (node.isBlank) return this.blankRule
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return findRule(this.array, node, this.options)
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|| findRule(this._keep, node, this.options)
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|| findRule(this._remove, node, this.options)
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|| this.defaultRule
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}
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forEach(fn) {
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for (var i = 0; i < this.array.length; i++) fn(this.array[i], i);
|
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}
|
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}
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const findRule = (rules, node, options) => {
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for (var i = 0; i < rules.length; i++) {
|
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var rule = rules[i];
|
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if (filterValue(rule, node, options)) return rule
|
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}
|
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return void 0
|
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},
|
||||
|
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filterValue = (rule, node, options) => {
|
||||
var filter = rule.filter;
|
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if (typeof filter === 'string') {
|
||||
return (filter === node.nodeName.toLowerCase())
|
||||
} else if (Array.isArray(filter)) {
|
||||
return (filter.indexOf(node.nodeName.toLowerCase()) > -1)
|
||||
} else if (typeof filter === 'function') {
|
||||
return !!filter.call(rule, node, options)
|
||||
}
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throw new TypeError('`filter` needs to be a string, array, or function')
|
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},
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/**
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* The collapseWhitespace function is adapted from collapse-whitespace
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* by Luc Thevenard.
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014 Luc Thevenard <lucthevenard@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
/**
|
||||
* collapseWhitespace(options) removes extraneous whitespace from an the given element.
|
||||
*
|
||||
* @param {Object} options
|
||||
*/
|
||||
collapseWhitespace = (options) => {
|
||||
var element = options.element;
|
||||
var isBlock = options.isBlock;
|
||||
var isVoid = options.isVoid;
|
||||
var isPre = options.isPre || ((node) => node.nodeName === 'PRE');
|
||||
|
||||
if (!element.firstChild || isPre(element)) return
|
||||
|
||||
var prevText = null;
|
||||
var keepLeadingWs = false;
|
||||
|
||||
var prev = null;
|
||||
var node = next(prev, element, isPre);
|
||||
|
||||
while (node !== element) {
|
||||
if (node.nodeType === 3 || node.nodeType === 4) { // Node.TEXT_NODE or Node.CDATA_SECTION_NODE
|
||||
var text = node.data.replace(/[ \r\n\t]+/g, ' ');
|
||||
|
||||
if ((!prevText || / $/.test(prevText.data)) &&
|
||||
!keepLeadingWs && text[0] === ' ') {
|
||||
text = text.substr(1);
|
||||
}
|
||||
|
||||
// `text` might be empty at this point.
|
||||
if (!text) {
|
||||
node = remove(node);
|
||||
continue
|
||||
}
|
||||
|
||||
node.data = text;
|
||||
|
||||
prevText = node;
|
||||
} else if (node.nodeType === 1) { // Node.ELEMENT_NODE
|
||||
if (isBlock(node) || node.nodeName === 'BR') {
|
||||
if (prevText) {
|
||||
prevText.data = prevText.data.replace(/ $/, '');
|
||||
}
|
||||
|
||||
prevText = null;
|
||||
keepLeadingWs = false;
|
||||
} else if (isVoid(node) || isPre(node)) {
|
||||
// Avoid trimming space around non-block, non-BR void elements and inline PRE.
|
||||
prevText = null;
|
||||
keepLeadingWs = true;
|
||||
} else if (prevText) {
|
||||
// Drop protection if set previously.
|
||||
keepLeadingWs = false;
|
||||
}
|
||||
} else {
|
||||
node = remove(node);
|
||||
continue
|
||||
}
|
||||
|
||||
var nextNode = next(prev, node, isPre);
|
||||
prev = node;
|
||||
node = nextNode;
|
||||
}
|
||||
|
||||
if (prevText) {
|
||||
prevText.data = prevText.data.replace(/ $/, '');
|
||||
if (!prevText.data) {
|
||||
remove(prevText);
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
/**
|
||||
* remove(node) removes the given node from the DOM and returns the
|
||||
* next node in the sequence.
|
||||
*
|
||||
* @param {Node} node
|
||||
* @return {Node} node
|
||||
*/
|
||||
remove = (node) => {
|
||||
var next = node.nextSibling || node.parentNode;
|
||||
|
||||
node.parentNode.removeChild(node);
|
||||
|
||||
return next
|
||||
},
|
||||
|
||||
/**
|
||||
* next(prev, current, isPre) returns the next node in the sequence, given the
|
||||
* current and previous nodes.
|
||||
*
|
||||
* @param {Node} prev
|
||||
* @param {Node} current
|
||||
* @param {Function} isPre
|
||||
* @return {Node}
|
||||
*/
|
||||
next = (prev, current, isPre) => {
|
||||
if ((prev && prev.parentNode === current) || isPre(current)) {
|
||||
return current.nextSibling || current.parentNode
|
||||
}
|
||||
|
||||
return current.firstChild || current.nextSibling || current.parentNode
|
||||
},
|
||||
|
||||
/*
|
||||
* Parsing HTML strings
|
||||
*/
|
||||
|
||||
RootNode = (input, options) => {
|
||||
var root;
|
||||
if (typeof input === 'string') {
|
||||
var doc = htmlParser().parseFromString(
|
||||
// DOM parsers arrange elements in the <head> and <body>.
|
||||
// Wrapping in a custom element ensures elements are reliably arranged in
|
||||
// a single element.
|
||||
'<x-turndown id="turndown-root">' + input + '</x-turndown>',
|
||||
'text/html'
|
||||
);
|
||||
root = doc.getElementById('turndown-root');
|
||||
} else {
|
||||
root = input.cloneNode(true);
|
||||
}
|
||||
collapseWhitespace({
|
||||
element: root,
|
||||
isBlock: isBlock,
|
||||
isVoid: isVoid,
|
||||
isPre: options.preformattedCode ? isPreOrCode : null
|
||||
});
|
||||
|
||||
return root
|
||||
};
|
||||
|
||||
var _htmlParser;
|
||||
const htmlParser = () => {
|
||||
_htmlParser = _htmlParser || new DOMParser();
|
||||
return _htmlParser
|
||||
},
|
||||
|
||||
isPreOrCode = (node) => node.nodeName === 'PRE' || node.nodeName === 'CODE',
|
||||
|
||||
Node = (node, options) => {
|
||||
node.isBlock = isBlock(node);
|
||||
node.isCode = node.nodeName === 'CODE' || node.parentNode.isCode;
|
||||
node.isBlank = isBlank(node);
|
||||
node.flankingWhitespace = flankingWhitespace(node, options);
|
||||
return node
|
||||
},
|
||||
|
||||
isBlank = (node) =>
|
||||
(
|
||||
!isVoid(node) &&
|
||||
!isMeaningfulWhenBlank(node) &&
|
||||
/^\s*$/i.test(node.textContent) &&
|
||||
!hasVoid(node) &&
|
||||
!hasMeaningfulWhenBlank(node)
|
||||
)
|
||||
,
|
||||
|
||||
flankingWhitespace = (node, options) => {
|
||||
if (node.isBlock || (options.preformattedCode && node.isCode)) {
|
||||
return { leading: '', trailing: '' }
|
||||
}
|
||||
|
||||
var edges = edgeWhitespace(node.textContent);
|
||||
|
||||
// abandon leading ASCII WS if left-flanked by ASCII WS
|
||||
if (edges.leadingAscii && isFlankedByWhitespace('left', node, options)) {
|
||||
edges.leading = edges.leadingNonAscii;
|
||||
}
|
||||
|
||||
// abandon trailing ASCII WS if right-flanked by ASCII WS
|
||||
if (edges.trailingAscii && isFlankedByWhitespace('right', node, options)) {
|
||||
edges.trailing = edges.trailingNonAscii;
|
||||
}
|
||||
|
||||
return { leading: edges.leading, trailing: edges.trailing }
|
||||
},
|
||||
|
||||
edgeWhitespace = (string) => {
|
||||
var m = string.match(/^(([ \t\r\n]*)(\s*))(?:(?=\S)[\s\S]*\S)?((\s*?)([ \t\r\n]*))$/);
|
||||
return {
|
||||
leading: m[1], // whole string for whitespace-only strings
|
||||
leadingAscii: m[2],
|
||||
leadingNonAscii: m[3],
|
||||
trailing: m[4], // empty for whitespace-only strings
|
||||
trailingNonAscii: m[5],
|
||||
trailingAscii: m[6]
|
||||
}
|
||||
},
|
||||
|
||||
isFlankedByWhitespace = (side, node, options) => {
|
||||
var sibling;
|
||||
var regExp;
|
||||
var isFlanked;
|
||||
|
||||
if (side === 'left') {
|
||||
sibling = node.previousSibling;
|
||||
regExp = / $/;
|
||||
} else {
|
||||
sibling = node.nextSibling;
|
||||
regExp = /^ /;
|
||||
}
|
||||
|
||||
if (sibling) {
|
||||
if (sibling.nodeType === 3) {
|
||||
isFlanked = regExp.test(sibling.nodeValue);
|
||||
} else if (options.preformattedCode && sibling.nodeName === 'CODE') {
|
||||
isFlanked = false;
|
||||
} else if (sibling.nodeType === 1 && !isBlock(sibling)) {
|
||||
isFlanked = regExp.test(sibling.textContent);
|
||||
}
|
||||
}
|
||||
return isFlanked
|
||||
},
|
||||
|
||||
reduce = Array.prototype.reduce,
|
||||
escapes = [
|
||||
[/\\/g, '\\\\'],
|
||||
[/\*/g, '\\*'],
|
||||
[/^-/g, '\\-'],
|
||||
[/^\+ /g, '\\+ '],
|
||||
[/^(=+)/g, '\\$1'],
|
||||
[/^(#{1,6}) /g, '\\$1 '],
|
||||
[/`/g, '\\`'],
|
||||
[/^~~~/g, '\\~~~'],
|
||||
[/\[/g, '\\['],
|
||||
[/\]/g, '\\]'],
|
||||
[/^>/g, '\\>'],
|
||||
[/_/g, '\\_'],
|
||||
[/^(\d+)\. /g, '$1\\. ']
|
||||
];
|
||||
|
||||
class TurndownService
|
||||
{
|
||||
constructor(options) {
|
||||
if (!(this instanceof TurndownService)) return new TurndownService(options)
|
||||
|
||||
this.options = Object.assign({
|
||||
rules: rules,
|
||||
headingStyle: 'setext',
|
||||
hr: '* * *',
|
||||
bulletListMarker: '*',
|
||||
codeBlockStyle: 'indented',
|
||||
fence: '```',
|
||||
emDelimiter: '_',
|
||||
strongDelimiter: '**',
|
||||
linkStyle: 'inlined',
|
||||
linkReferenceStyle: 'full',
|
||||
br: ' ',
|
||||
preformattedCode: false,
|
||||
blankReplacement: (content, node) => node.isBlock ? '\n\n' : '',
|
||||
keepReplacement: (content, node) => node.isBlock ? '\n\n' + node.outerHTML + '\n\n' : node.outerHTML,
|
||||
defaultReplacement: (content, node) => node.isBlock ? '\n\n' + content + '\n\n' : content
|
||||
}, options);
|
||||
this.rules = new Rules(this.options);
|
||||
}
|
||||
|
||||
/**
|
||||
* The entry point for converting a string or DOM node to Markdown
|
||||
* @public
|
||||
* @param {String|HTMLElement} input The string or DOM node to convert
|
||||
* @returns A Markdown representation of the input
|
||||
* @type String
|
||||
*/
|
||||
|
||||
turndown(input) {
|
||||
if (!canConvert(input)) {
|
||||
throw new TypeError(
|
||||
input + ' is not a string, or an element/document/fragment node.'
|
||||
)
|
||||
}
|
||||
|
||||
if (input === '') return ''
|
||||
|
||||
var output = process.call(this, new RootNode(input, this.options));
|
||||
return postProcess.call(this, output)
|
||||
}
|
||||
|
||||
/**
|
||||
* Add one or more plugins
|
||||
* @public
|
||||
* @param {Function|Array} plugin The plugin or array of plugins to add
|
||||
* @returns The Turndown instance for chaining
|
||||
* @type Object
|
||||
*/
|
||||
|
||||
use(plugin) {
|
||||
if (Array.isArray(plugin)) {
|
||||
for (var i = 0; i < plugin.length; i++) this.use(plugin[i]);
|
||||
} else if (typeof plugin === 'function') {
|
||||
plugin(this);
|
||||
} else {
|
||||
throw new TypeError('plugin must be a Function or an Array of Functions')
|
||||
}
|
||||
return this
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds a rule
|
||||
* @public
|
||||
* @param {String} key The unique key of the rule
|
||||
* @param {Object} rule The rule
|
||||
* @returns The Turndown instance for chaining
|
||||
* @type Object
|
||||
*/
|
||||
|
||||
addRule(key, rule) {
|
||||
this.rules.add(key, rule);
|
||||
return this
|
||||
}
|
||||
|
||||
/**
|
||||
* Keep a node (as HTML) that matches the filter
|
||||
* @public
|
||||
* @param {String|Array|Function} filter The unique key of the rule
|
||||
* @returns The Turndown instance for chaining
|
||||
* @type Object
|
||||
*/
|
||||
|
||||
keep(filter) {
|
||||
this.rules.keep(filter);
|
||||
return this
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove a node that matches the filter
|
||||
* @public
|
||||
* @param {String|Array|Function} filter The unique key of the rule
|
||||
* @returns The Turndown instance for chaining
|
||||
* @type Object
|
||||
*/
|
||||
|
||||
remove(filter) {
|
||||
this.rules.remove(filter);
|
||||
return this
|
||||
}
|
||||
|
||||
/**
|
||||
* Escapes Markdown syntax
|
||||
* @public
|
||||
* @param {String} string The string to escape
|
||||
* @returns A string with Markdown syntax escaped
|
||||
* @type String
|
||||
*/
|
||||
|
||||
escape(string) {
|
||||
return escapes.reduce((accumulator, escape) => accumulator.replace(escape[0], escape[1]), string)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Reduces a DOM node down to its Markdown string equivalent
|
||||
* @private
|
||||
* @param {HTMLElement} parentNode The node to convert
|
||||
* @returns A Markdown representation of the node
|
||||
* @type String
|
||||
*/
|
||||
|
||||
const process = (parentNode) => {
|
||||
var self = this;
|
||||
return reduce.call(parentNode.childNodes, (output, node) => {
|
||||
node = new Node(node, self.options);
|
||||
|
||||
var replacement = '';
|
||||
if (node.nodeType === 3) {
|
||||
replacement = node.isCode ? node.nodeValue : self.escape(node.nodeValue);
|
||||
} else if (node.nodeType === 1) {
|
||||
replacement = replacementForNode.call(self, node);
|
||||
}
|
||||
|
||||
return join(output, replacement)
|
||||
}, '')
|
||||
},
|
||||
|
||||
/**
|
||||
* Appends strings as each rule requires and trims the output
|
||||
* @private
|
||||
* @param {String} output The conversion output
|
||||
* @returns A trimmed version of the ouput
|
||||
* @type String
|
||||
*/
|
||||
|
||||
postProcess = (output) => {
|
||||
var self = this;
|
||||
this.rules.forEach((rule) => {
|
||||
if (typeof rule.append === 'function') {
|
||||
output = join(output, rule.append(self.options));
|
||||
}
|
||||
});
|
||||
|
||||
return output.replace(/^[\t\r\n]+/, '').replace(/[\t\r\n\s]+$/, '')
|
||||
},
|
||||
|
||||
/**
|
||||
* Converts an element node to its Markdown equivalent
|
||||
* @private
|
||||
* @param {HTMLElement} node The node to convert
|
||||
* @returns A Markdown representation of the node
|
||||
* @type String
|
||||
*/
|
||||
|
||||
replacementForNode = (node) => {
|
||||
var rule = this.rules.forNode(node);
|
||||
var content = process.call(this, node);
|
||||
var whitespace = node.flankingWhitespace;
|
||||
if (whitespace.leading || whitespace.trailing) content = content.trim();
|
||||
return (
|
||||
whitespace.leading +
|
||||
rule.replacement(content, node, this.options) +
|
||||
whitespace.trailing
|
||||
)
|
||||
},
|
||||
|
||||
/**
|
||||
* Joins replacement to the current output with appropriate number of new lines
|
||||
* @private
|
||||
* @param {String} output The current conversion output
|
||||
* @param {String} replacement The string to append to the output
|
||||
* @returns Joined output
|
||||
* @type String
|
||||
*/
|
||||
|
||||
join = (output, replacement) => {
|
||||
var s1 = trimTrailingNewlines(output);
|
||||
var s2 = trimLeadingNewlines(replacement);
|
||||
var nls = Math.max(output.length - s1.length, replacement.length - s2.length);
|
||||
var separator = '\n\n'.substring(0, nls);
|
||||
|
||||
return s1 + separator + s2
|
||||
},
|
||||
|
||||
/**
|
||||
* Determines whether an input can be converted
|
||||
* @private
|
||||
* @param {String|HTMLElement} input Describe this parameter
|
||||
* @returns Describe what it returns
|
||||
* @type String|Object|Array|Boolean|Number
|
||||
*/
|
||||
|
||||
canConvert = (input) =>
|
||||
(
|
||||
input != null && (
|
||||
typeof input === 'string' ||
|
||||
(input.nodeType && (
|
||||
input.nodeType === 1 || input.nodeType === 9 || input.nodeType === 11
|
||||
))
|
||||
)
|
||||
)
|
||||
;
|
||||
|
||||
return TurndownService;
|
||||
|
||||
})();
|
||||
Loading…
Reference in a new issue