mirror of
https://github.com/the-djmaze/snappymail.git
synced 2025-01-11 01:07:39 +08:00
981 lines
30 KiB
PHP
981 lines
30 KiB
PHP
<?php
|
|
namespace Pelago;
|
|
|
|
/**
|
|
* This class provides functions for converting CSS styles into inline style attributes in your HTML code.
|
|
*
|
|
* For more information, please see the README.md file.
|
|
*
|
|
* @author Cameron Brooks
|
|
* @author Jaime Prado
|
|
* @author Roman Ožana <ozana@omdesign.cz>
|
|
*/
|
|
class Emogrifier
|
|
{
|
|
/**
|
|
* @var string
|
|
*/
|
|
const ENCODING = 'UTF-8';
|
|
|
|
/**
|
|
* @var int
|
|
*/
|
|
const CACHE_KEY_CSS = 0;
|
|
|
|
/**
|
|
* @var int
|
|
*/
|
|
const CACHE_KEY_SELECTOR = 1;
|
|
|
|
/**
|
|
* @var int
|
|
*/
|
|
const CACHE_KEY_XPATH = 2;
|
|
|
|
/**
|
|
* @var int
|
|
*/
|
|
const CACHE_KEY_CSS_DECLARATION_BLOCK = 3;
|
|
|
|
/**
|
|
* for calculating nth-of-type and nth-child selectors
|
|
*
|
|
* @var int
|
|
*/
|
|
const INDEX = 0;
|
|
|
|
/**
|
|
* for calculating nth-of-type and nth-child selectors
|
|
*
|
|
* @var int
|
|
*/
|
|
const MULTIPLIER = 1;
|
|
|
|
/**
|
|
* @var string
|
|
*/
|
|
const ID_ATTRIBUTE_MATCHER = '/(\\w+)?\\#([\\w\\-]+)/';
|
|
|
|
/**
|
|
* @var string
|
|
*/
|
|
const CLASS_ATTRIBUTE_MATCHER = '/(\\w+|[\\*\\]])?((\\.[\\w\\-]+)+)/';
|
|
|
|
/**
|
|
* @var string
|
|
*/
|
|
private $html = '';
|
|
|
|
/**
|
|
* @var string
|
|
*/
|
|
private $css = '';
|
|
|
|
/**
|
|
* @var string[]
|
|
*/
|
|
private $unprocessableHtmlTags = array('wbr');
|
|
|
|
/**
|
|
* @var array[]
|
|
*/
|
|
private $caches = array(
|
|
self::CACHE_KEY_CSS => array(),
|
|
self::CACHE_KEY_SELECTOR => array(),
|
|
self::CACHE_KEY_XPATH => array(),
|
|
self::CACHE_KEY_CSS_DECLARATION_BLOCK => array(),
|
|
);
|
|
|
|
/**
|
|
* the visited nodes with the XPath paths as array keys
|
|
*
|
|
* @var \DOMNode[]
|
|
*/
|
|
private $visitedNodes = array();
|
|
|
|
/**
|
|
* the styles to apply to the nodes with the XPath paths as array keys for the outer array
|
|
* and the attribute names/values as key/value pairs for the inner array
|
|
*
|
|
* @var array[]
|
|
*/
|
|
private $styleAttributesForNodes = array();
|
|
|
|
/**
|
|
* Determines whether the "style" attributes of tags in the the HTML passed to this class should be preserved.
|
|
* If set to false, the value of the style attributes will be discarded.
|
|
*
|
|
* @var bool
|
|
*/
|
|
private $isInlineStyleAttributesParsingEnabled = true;
|
|
|
|
/**
|
|
* Determines whether the <style> blocks in the HTML passed to this class should be parsed.
|
|
*
|
|
* If set to true, the <style> blocks will be removed from the HTML and their contents will be applied to the HTML
|
|
* via inline styles.
|
|
*
|
|
* If set to false, the <style> blocks will be left as they are in the HTML.
|
|
*
|
|
* @var bool
|
|
*/
|
|
private $isStyleBlocksParsingEnabled = true;
|
|
|
|
/**
|
|
* This attribute applies to the case where you want to preserve your original text encoding.
|
|
*
|
|
* By default, emogrifier translates your text into HTML entities for two reasons:
|
|
*
|
|
* 1. Because of client incompatibilities, it is better practice to send out HTML entities
|
|
* rather than unicode over email.
|
|
*
|
|
* 2. It translates any illegal XML characters that DOMDocument cannot work with.
|
|
*
|
|
* If you would like to preserve your original encoding, set this attribute to true.
|
|
*
|
|
* @var bool
|
|
*/
|
|
public $preserveEncoding = false;
|
|
|
|
/**
|
|
* The constructor.
|
|
*
|
|
* @param string $html the HTML to emogrify, must be UTF-8-encoded
|
|
* @param string $css the CSS to merge, must be UTF-8-encoded
|
|
*/
|
|
public function __construct($html = '', $css = '')
|
|
{
|
|
$this->setHtml($html);
|
|
$this->setCss($css);
|
|
}
|
|
|
|
/**
|
|
* The destructor.
|
|
*/
|
|
public function __destruct()
|
|
{
|
|
$this->purgeVisitedNodes();
|
|
}
|
|
|
|
/**
|
|
* Sets the HTML to emogrify.
|
|
*
|
|
* @param string $html the HTML to emogrify, must be UTF-8-encoded
|
|
*
|
|
* @return void
|
|
*/
|
|
public function setHtml($html)
|
|
{
|
|
$this->html = $html;
|
|
}
|
|
|
|
/**
|
|
* Sets the CSS to merge with the HTML.
|
|
*
|
|
* @param string $css the CSS to merge, must be UTF-8-encoded
|
|
*
|
|
* @return void
|
|
*/
|
|
public function setCss($css)
|
|
{
|
|
$this->css = $css;
|
|
}
|
|
|
|
/**
|
|
* Applies the CSS you submit to the HTML you submit.
|
|
*
|
|
* This method places the CSS inline.
|
|
*
|
|
* @param \DOMDocument $dom = null
|
|
*
|
|
* @return string|\DOMDocument
|
|
*
|
|
* @throws \BadMethodCallException
|
|
*/
|
|
public function emogrify($dom = null)
|
|
{
|
|
if ($this->html === '' && !$dom) {
|
|
throw new \BadMethodCallException('Please set some HTML first before calling emogrify.', 1390393096);
|
|
}
|
|
|
|
$xmlDocument = $dom ? $dom : $this->createXmlDocument();
|
|
$xpath = new \DOMXPath($xmlDocument);
|
|
$this->clearAllCaches();
|
|
|
|
// Before be begin processing the CSS file, parse the document and normalize all existing CSS attributes.
|
|
// This changes 'DISPLAY: none' to 'display: none'.
|
|
// We wouldn't have to do this if DOMXPath supported XPath 2.0.
|
|
// Also store a reference of nodes with existing inline styles so we don't overwrite them.
|
|
$this->purgeVisitedNodes();
|
|
|
|
$nodesWithStyleAttributes = @$xpath->query('//*[@style]');
|
|
if ($nodesWithStyleAttributes) {
|
|
/** @var \DOMElement $node */
|
|
foreach ($nodesWithStyleAttributes as $node) {
|
|
if ($this->isInlineStyleAttributesParsingEnabled) {
|
|
$this->normalizeStyleAttributes($node);
|
|
} else {
|
|
$node->removeAttribute('style');
|
|
}
|
|
}
|
|
}
|
|
|
|
// grab any existing style blocks from the html and append them to the existing CSS
|
|
// (these blocks should be appended so as to have precedence over conflicting styles in the existing CSS)
|
|
$allCss = $this->css;
|
|
|
|
if ($this->isStyleBlocksParsingEnabled) {
|
|
$allCss .= $this->getCssFromAllStyleNodes($xpath);
|
|
}
|
|
|
|
$cssParts = $this->splitCssAndMediaQuery($allCss);
|
|
|
|
$cssKey = md5($cssParts['css']);
|
|
if (!isset($this->caches[self::CACHE_KEY_CSS][$cssKey])) {
|
|
// process the CSS file for selectors and definitions
|
|
preg_match_all('/(?:^|[\\s^{}]*)([^{]+){([^}]*)}/mis', $cssParts['css'], $matches, PREG_SET_ORDER);
|
|
|
|
$allSelectors = array();
|
|
foreach ($matches as $key => $selectorString) {
|
|
// if there is a blank definition, skip
|
|
if (!strlen(trim($selectorString[2]))) {
|
|
continue;
|
|
}
|
|
|
|
// else split by commas and duplicate attributes so we can sort by selector precedence
|
|
$selectors = explode(',', $selectorString[1]);
|
|
foreach ($selectors as $selector) {
|
|
// don't process pseudo-elements and behavioral (dynamic) pseudo-classes;
|
|
// only allow structural pseudo-classes
|
|
if (strpos($selector, ':') !== false && !preg_match('/:\\S+\\-(child|type)\\(/i', $selector)
|
|
) {
|
|
continue;
|
|
}
|
|
|
|
$allSelectors[] = array('selector' => trim($selector),
|
|
'attributes' => trim($selectorString[2]),
|
|
// keep track of where it appears in the file, since order is important
|
|
'line' => $key,
|
|
);
|
|
}
|
|
}
|
|
|
|
// now sort the selectors by precedence
|
|
usort($allSelectors, array($this,'sortBySelectorPrecedence'));
|
|
|
|
$this->caches[self::CACHE_KEY_CSS][$cssKey] = $allSelectors;
|
|
}
|
|
|
|
foreach ($this->caches[self::CACHE_KEY_CSS][$cssKey] as $value) {
|
|
// query the body for the xpath selector
|
|
$nodesMatchingCssSelectors = @$xpath->query($this->translateCssToXpath($value['selector']));
|
|
if (!$nodesMatchingCssSelectors)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
/** @var \DOMElement $node */
|
|
foreach ($nodesMatchingCssSelectors as $node) {
|
|
// if it has a style attribute, get it, process it, and append (overwrite) new stuff
|
|
if ($node->hasAttribute('style')) {
|
|
// break it up into an associative array
|
|
$oldStyleDeclarations = $this->parseCssDeclarationBlock($node->getAttribute('style'));
|
|
} else {
|
|
$oldStyleDeclarations = array();
|
|
}
|
|
$newStyleDeclarations = $this->parseCssDeclarationBlock($value['attributes']);
|
|
$node->setAttribute(
|
|
'style',
|
|
$this->generateStyleStringFromDeclarationsArrays($oldStyleDeclarations, $newStyleDeclarations)
|
|
);
|
|
}
|
|
}
|
|
|
|
if ($this->isInlineStyleAttributesParsingEnabled) {
|
|
$this->fillStyleAttributesWithMergedStyles();
|
|
}
|
|
|
|
// This removes styles from your email that contain display:none.
|
|
// We need to look for display:none, but we need to do a case-insensitive search. Since DOMDocument only
|
|
// supports XPath 1.0, lower-case() isn't available to us. We've thus far only set attributes to lowercase,
|
|
// not attribute values. Consequently, we need to translate() the letters that would be in 'NONE' ("NOE")
|
|
// to lowercase.
|
|
$nodesWithStyleDisplayNone = @$xpath->query(
|
|
'//*[contains(translate(translate(@style," ",""),"NOE","noe"),"display:none")]'
|
|
);
|
|
// The checks on parentNode and is_callable below ensure that if we've deleted the parent node,
|
|
// we don't try to call removeChild on a nonexistent child node
|
|
if ($nodesWithStyleDisplayNone && $nodesWithStyleDisplayNone->length > 0) {
|
|
/** @var \DOMNode $node */
|
|
foreach ($nodesWithStyleDisplayNone as $node) {
|
|
if ($node->parentNode && is_callable(array($node->parentNode,'removeChild'))) {
|
|
$node->parentNode->removeChild($node);
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->copyCssWithMediaToStyleNode($cssParts, $xmlDocument);
|
|
|
|
if ($dom)
|
|
{
|
|
return $xmlDocument;
|
|
}
|
|
|
|
if ($this->preserveEncoding) {
|
|
return mb_convert_encoding($xmlDocument->saveHTML(), self::ENCODING, 'HTML-ENTITIES');
|
|
} else {
|
|
return $xmlDocument->saveHTML();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Disables the parsing of inline styles.
|
|
*
|
|
* @return void
|
|
*/
|
|
public function disableInlineStyleAttributesParsing()
|
|
{
|
|
$this->isInlineStyleAttributesParsingEnabled = false;
|
|
}
|
|
|
|
/**
|
|
* Disables the parsing of <style> blocks.
|
|
*
|
|
* @return void
|
|
*/
|
|
public function disableStyleBlocksParsing()
|
|
{
|
|
$this->isStyleBlocksParsingEnabled = false;
|
|
}
|
|
|
|
/**
|
|
* Clears all caches.
|
|
*
|
|
* @return void
|
|
*/
|
|
private function clearAllCaches()
|
|
{
|
|
$this->clearCache(self::CACHE_KEY_CSS);
|
|
$this->clearCache(self::CACHE_KEY_SELECTOR);
|
|
$this->clearCache(self::CACHE_KEY_XPATH);
|
|
$this->clearCache(self::CACHE_KEY_CSS_DECLARATION_BLOCK);
|
|
}
|
|
|
|
/**
|
|
* Clears a single cache by key.
|
|
*
|
|
* @param int $key the cache key, must be CACHE_KEY_CSS, CACHE_KEY_SELECTOR, CACHE_KEY_XPATH
|
|
* or CACHE_KEY_CSS_DECLARATION_BLOCK
|
|
*
|
|
* @return void
|
|
*
|
|
* @throws \InvalidArgumentException
|
|
*/
|
|
private function clearCache($key)
|
|
{
|
|
$allowedCacheKeys = array(
|
|
self::CACHE_KEY_CSS,
|
|
self::CACHE_KEY_SELECTOR,
|
|
self::CACHE_KEY_XPATH,
|
|
self::CACHE_KEY_CSS_DECLARATION_BLOCK,
|
|
);
|
|
if (!in_array($key, $allowedCacheKeys, true)) {
|
|
throw new \InvalidArgumentException('Invalid cache key: ' . $key, 1391822035);
|
|
}
|
|
|
|
$this->caches[$key] = array();
|
|
}
|
|
|
|
/**
|
|
* Purges the visited nodes.
|
|
*
|
|
* @return void
|
|
*/
|
|
private function purgeVisitedNodes()
|
|
{
|
|
$this->visitedNodes = array();
|
|
$this->styleAttributesForNodes = array();
|
|
}
|
|
|
|
/**
|
|
* Marks a tag for removal.
|
|
*
|
|
* There are some HTML tags that DOMDocument cannot process, and it will throw an error if it encounters them.
|
|
* In particular, DOMDocument will complain if you try to use HTML5 tags in an XHTML document.
|
|
*
|
|
* Note: The tags will not be removed if they have any content.
|
|
*
|
|
* @param string $tagName the tag name, e.g., "p"
|
|
*
|
|
* @return void
|
|
*/
|
|
public function addUnprocessableHtmlTag($tagName)
|
|
{
|
|
$this->unprocessableHtmlTags[] = $tagName;
|
|
}
|
|
|
|
/**
|
|
* Drops a tag from the removal list.
|
|
*
|
|
* @param string $tagName the tag name, e.g., "p"
|
|
*
|
|
* @return void
|
|
*/
|
|
public function removeUnprocessableHtmlTag($tagName)
|
|
{
|
|
$key = array_search($tagName, $this->unprocessableHtmlTags, true);
|
|
if ($key !== false) {
|
|
unset($this->unprocessableHtmlTags[$key]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Normalizes the value of the "style" attribute and saves it.
|
|
*
|
|
* @param \DOMElement $node
|
|
*
|
|
* @return void
|
|
*/
|
|
private function normalizeStyleAttributes(\DOMElement $node)
|
|
{
|
|
$normalizedOriginalStyle = preg_replace_callback(
|
|
'/[A-z\\-]+(?=\\:)/S',
|
|
function (array $m) {
|
|
return strtolower($m[0]);
|
|
},
|
|
$node->getAttribute('style')
|
|
);
|
|
|
|
// in order to not overwrite existing style attributes in the HTML, we
|
|
// have to save the original HTML styles
|
|
$nodePath = $node->getNodePath();
|
|
if (!isset($this->styleAttributesForNodes[$nodePath])) {
|
|
$this->styleAttributesForNodes[$nodePath] = $this->parseCssDeclarationBlock($normalizedOriginalStyle);
|
|
$this->visitedNodes[$nodePath] = $node;
|
|
}
|
|
|
|
$node->setAttribute('style', $normalizedOriginalStyle);
|
|
}
|
|
|
|
/**
|
|
* Merges styles from styles attributes and style nodes and applies them to the attribute nodes
|
|
*
|
|
* return @void
|
|
*/
|
|
private function fillStyleAttributesWithMergedStyles()
|
|
{
|
|
foreach ($this->styleAttributesForNodes as $nodePath => $styleAttributesForNode) {
|
|
$node = $this->visitedNodes[$nodePath];
|
|
$currentStyleAttributes = $this->parseCssDeclarationBlock($node->getAttribute('style'));
|
|
$node->setAttribute(
|
|
'style',
|
|
$this->generateStyleStringFromDeclarationsArrays(
|
|
$currentStyleAttributes,
|
|
$styleAttributesForNode
|
|
)
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This method merges old or existing name/value array with new name/value array
|
|
* and then generates a string of the combined style suitable for placing inline.
|
|
* This becomes the single point for CSS string generation allowing for consistent
|
|
* CSS output no matter where the CSS originally came from.
|
|
*
|
|
* @param string[] $oldStyles
|
|
* @param string[] $newStyles
|
|
*
|
|
* @return string
|
|
*/
|
|
private function generateStyleStringFromDeclarationsArrays(array $oldStyles, array $newStyles)
|
|
{
|
|
$combinedStyles = array_merge($oldStyles, $newStyles);
|
|
$style = '';
|
|
foreach ($combinedStyles as $attributeName => $attributeValue) {
|
|
$style .= (strtolower(trim($attributeName)) . ': ' . trim($attributeValue) . '; ');
|
|
}
|
|
return trim($style);
|
|
}
|
|
|
|
|
|
/**
|
|
* Copies the media part from CSS array parts to $xmlDocument.
|
|
*
|
|
* @param string[] $cssParts
|
|
* @param \DOMDocument $xmlDocument
|
|
*
|
|
* @return void
|
|
*/
|
|
public function copyCssWithMediaToStyleNode(array $cssParts, \DOMDocument $xmlDocument)
|
|
{
|
|
if (isset($cssParts['media']) && $cssParts['media'] !== '') {
|
|
$this->addStyleElementToDocument($xmlDocument, $cssParts['media']);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns CSS content.
|
|
*
|
|
* @param \DOMXPath $xpath
|
|
*
|
|
* @return string
|
|
*/
|
|
private function getCssFromAllStyleNodes(\DOMXPath $xpath)
|
|
{
|
|
$styleNodes = @$xpath->query('//style');
|
|
|
|
if (!$styleNodes) {
|
|
return '';
|
|
}
|
|
|
|
$css = '';
|
|
/** @var \DOMNode $styleNode */
|
|
foreach ($styleNodes as $styleNode) {
|
|
$css .= "\n\n" . $styleNode->nodeValue;
|
|
$styleNode->parentNode->removeChild($styleNode);
|
|
}
|
|
|
|
return $css;
|
|
}
|
|
|
|
/**
|
|
* Adds a style element with $css to $document.
|
|
*
|
|
* This method is protected to allow overriding.
|
|
*
|
|
* @see https://github.com/jjriv/emogrifier/issues/103
|
|
*
|
|
* @param \DOMDocument $document
|
|
* @param string $css
|
|
*
|
|
* @return void
|
|
*/
|
|
protected function addStyleElementToDocument(\DOMDocument $document, $css)
|
|
{
|
|
$styleElement = $document->createElement('style', $css);
|
|
$styleAttribute = $document->createAttribute('type');
|
|
$styleAttribute->value = 'text/css';
|
|
$styleElement->appendChild($styleAttribute);
|
|
|
|
$head = $this->getOrCreateHeadElement($document);
|
|
$head->appendChild($styleElement);
|
|
}
|
|
|
|
/**
|
|
* Returns the existing or creates a new head element in $document.
|
|
*
|
|
* @param \DOMDocument $document
|
|
*
|
|
* @return \DOMNode the head element
|
|
*/
|
|
private function getOrCreateHeadElement(\DOMDocument $document)
|
|
{
|
|
$head = $document->getElementsByTagName('head')->item(0);
|
|
|
|
if ($head === null) {
|
|
$head = $document->createElement('head');
|
|
$html = $document->getElementsByTagName('html')->item(0);
|
|
$html->insertBefore($head, $document->getElementsByTagName('body')->item(0));
|
|
}
|
|
|
|
return $head;
|
|
}
|
|
|
|
/**
|
|
* Splits input CSS code to an array where:
|
|
*
|
|
* - key "css" will be contains clean CSS code
|
|
* - key "media" will be contains all valuable media queries
|
|
*
|
|
* Example:
|
|
*
|
|
* The CSS code
|
|
*
|
|
* "@import "file.css"; h1 { color:red; } @media { h1 {}} @media tv { h1 {}}"
|
|
*
|
|
* will be parsed into the following array:
|
|
*
|
|
* "css" => "h1 { color:red; }"
|
|
* "media" => "@media { h1 {}}"
|
|
*
|
|
* @param string $css
|
|
*
|
|
* @return string[]
|
|
*/
|
|
private function splitCssAndMediaQuery($css)
|
|
{
|
|
$media = '';
|
|
|
|
$css = preg_replace_callback(
|
|
'#@media\\s+(?:only\\s)?(?:[\\s{\\(]|screen|all)\\s?[^{]+{.*}\\s*}\\s*#misU',
|
|
function ($matches) use (&$media) {
|
|
$media .= $matches[0];
|
|
},
|
|
$css
|
|
);
|
|
|
|
// filter the CSS
|
|
$search = array(
|
|
// get rid of css comment code
|
|
'/\\/\\*.*\\*\\//sU',
|
|
// strip out any import directives
|
|
'/^\\s*@import\\s[^;]+;/misU',
|
|
// strip remains media enclosures
|
|
'/^\\s*@media\\s[^{]+{(.*)}\\s*}\\s/misU',
|
|
);
|
|
|
|
$replace = array(
|
|
'',
|
|
'',
|
|
'',
|
|
);
|
|
|
|
// clean CSS before output
|
|
$css = preg_replace($search, $replace, $css);
|
|
|
|
return array('css' => $css, 'media' => $media);
|
|
}
|
|
|
|
/**
|
|
* Creates a DOMDocument instance with the current HTML.
|
|
*
|
|
* @return \DOMDocument
|
|
*/
|
|
private function createXmlDocument()
|
|
{
|
|
$xmlDocument = new \DOMDocument;
|
|
$xmlDocument->encoding = self::ENCODING;
|
|
$xmlDocument->strictErrorChecking = false;
|
|
$xmlDocument->formatOutput = true;
|
|
$libXmlState = libxml_use_internal_errors(true);
|
|
@$xmlDocument->loadHTML($this->getUnifiedHtml());
|
|
libxml_clear_errors();
|
|
libxml_use_internal_errors($libXmlState);
|
|
$xmlDocument->normalizeDocument();
|
|
|
|
return $xmlDocument;
|
|
}
|
|
|
|
/**
|
|
* Returns the HTML with the non-ASCII characters converts into HTML entities and the unprocessable
|
|
* HTML tags removed.
|
|
*
|
|
* @return string the unified HTML
|
|
*
|
|
* @throws \BadMethodCallException
|
|
*/
|
|
private function getUnifiedHtml()
|
|
{
|
|
if (!empty($this->unprocessableHtmlTags)) {
|
|
$unprocessableHtmlTags = implode('|', $this->unprocessableHtmlTags);
|
|
$bodyWithoutUnprocessableTags = preg_replace(
|
|
'/<\\/?(' . $unprocessableHtmlTags . ')[^>]*>/i',
|
|
'',
|
|
$this->html
|
|
);
|
|
} else {
|
|
$bodyWithoutUnprocessableTags = $this->html;
|
|
}
|
|
|
|
return mb_convert_encoding($bodyWithoutUnprocessableTags, 'HTML-ENTITIES', self::ENCODING);
|
|
}
|
|
|
|
/**
|
|
* @param string[] $a
|
|
* @param string[] $b
|
|
*
|
|
* @return int
|
|
*/
|
|
private function sortBySelectorPrecedence(array $a, array $b)
|
|
{
|
|
$precedenceA = $this->getCssSelectorPrecedence($a['selector']);
|
|
$precedenceB = $this->getCssSelectorPrecedence($b['selector']);
|
|
|
|
// We want these sorted in ascending order so selectors with lesser precedence get processed first and
|
|
// selectors with greater precedence get sorted last.
|
|
$precedenceForEquals = ($a['line'] < $b['line'] ? -1 : 1);
|
|
$precedenceForNotEquals = ($precedenceA < $precedenceB ? -1 : 1);
|
|
return ($precedenceA === $precedenceB) ? $precedenceForEquals : $precedenceForNotEquals;
|
|
}
|
|
|
|
/**
|
|
* @param string $selector
|
|
*
|
|
* @return int
|
|
*/
|
|
private function getCssSelectorPrecedence($selector)
|
|
{
|
|
$selectorKey = md5($selector);
|
|
if (!isset($this->caches[self::CACHE_KEY_SELECTOR][$selectorKey])) {
|
|
$precedence = 0;
|
|
$value = 100;
|
|
// ids: worth 100, classes: worth 10, elements: worth 1
|
|
$search = array('\\#','\\.','');
|
|
|
|
foreach ($search as $s) {
|
|
if (trim($selector) === '') {
|
|
break;
|
|
}
|
|
$number = 0;
|
|
$selector = preg_replace('/' . $s . '\\w+/', '', $selector, -1, $number);
|
|
$precedence += ($value * $number);
|
|
$value /= 10;
|
|
}
|
|
$this->caches[self::CACHE_KEY_SELECTOR][$selectorKey] = $precedence;
|
|
}
|
|
|
|
return $this->caches[self::CACHE_KEY_SELECTOR][$selectorKey];
|
|
}
|
|
|
|
/**
|
|
* Right now, we support all CSS 1 selectors and most CSS2/3 selectors.
|
|
*
|
|
* @see http://plasmasturm.org/log/444/
|
|
*
|
|
* @param string $paramCssSelector
|
|
*
|
|
* @return string
|
|
*/
|
|
private function translateCssToXpath($paramCssSelector)
|
|
{
|
|
$cssSelector = ' ' . $paramCssSelector . ' ';
|
|
$cssSelector = preg_replace_callback(
|
|
'/\\s+\\w+\\s+/',
|
|
function (array $matches) {
|
|
return strtolower($matches[0]);
|
|
},
|
|
$cssSelector
|
|
);
|
|
$cssSelector = trim($cssSelector);
|
|
$xpathKey = md5($cssSelector);
|
|
if (!isset($this->caches[self::CACHE_KEY_XPATH][$xpathKey])) {
|
|
// returns an Xpath selector
|
|
$search = array(
|
|
// Matches any element that is a child of parent.
|
|
'/\\s+>\\s+/',
|
|
// Matches any element that is an adjacent sibling.
|
|
'/\\s+\\+\\s+/',
|
|
// Matches any element that is a descendant of an parent element element.
|
|
'/\\s+/',
|
|
// first-child pseudo-selector
|
|
'/([^\\/]+):first-child/i',
|
|
// last-child pseudo-selector
|
|
'/([^\\/]+):last-child/i',
|
|
// Matches attribute only selector
|
|
'/^\\[(\\w+)\\]/',
|
|
// Matches element with attribute
|
|
'/(\\w)\\[(\\w+)\\]/',
|
|
// Matches element with EXACT attribute
|
|
'/(\\w)\\[(\\w+)\\=[\'"]?(\\w+)[\'"]?\\]/',
|
|
);
|
|
$replace = array(
|
|
'/',
|
|
'/following-sibling::*[1]/self::',
|
|
'//',
|
|
'*[1]/self::\\1',
|
|
'*[last()]/self::\\1',
|
|
'*[@\\1]',
|
|
'\\1[@\\2]',
|
|
'\\1[@\\2="\\3"]',
|
|
);
|
|
|
|
$cssSelector = '//' . preg_replace($search, $replace, $cssSelector);
|
|
|
|
$cssSelector = preg_replace_callback(
|
|
self::ID_ATTRIBUTE_MATCHER,
|
|
array($this, 'matchIdAttributes'),
|
|
$cssSelector
|
|
);
|
|
$cssSelector = preg_replace_callback(
|
|
self::CLASS_ATTRIBUTE_MATCHER,
|
|
array($this, 'matchClassAttributes'),
|
|
$cssSelector
|
|
);
|
|
|
|
// Advanced selectors are going to require a bit more advanced emogrification.
|
|
// When we required PHP 5.3, we could do this with closures.
|
|
$cssSelector = preg_replace_callback(
|
|
'/([^\\/]+):nth-child\\(\\s*(odd|even|[+\\-]?\\d|[+\\-]?\\d?n(\\s*[+\\-]\\s*\\d)?)\\s*\\)/i',
|
|
array($this, 'translateNthChild'),
|
|
$cssSelector
|
|
);
|
|
$cssSelector = preg_replace_callback(
|
|
'/([^\\/]+):nth-of-type\\(\s*(odd|even|[+\\-]?\\d|[+\\-]?\\d?n(\\s*[+\\-]\\s*\\d)?)\\s*\\)/i',
|
|
array($this, 'translateNthOfType'),
|
|
$cssSelector
|
|
);
|
|
|
|
$this->caches[self::CACHE_KEY_SELECTOR][$xpathKey] = $cssSelector;
|
|
}
|
|
return $this->caches[self::CACHE_KEY_SELECTOR][$xpathKey];
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return string
|
|
*/
|
|
private function matchIdAttributes(array $match)
|
|
{
|
|
return (strlen($match[1]) ? $match[1] : '*') . '[@id="' . $match[2] . '"]';
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return string
|
|
*/
|
|
private function matchClassAttributes(array $match)
|
|
{
|
|
return (strlen($match[1]) ? $match[1] : '*') . '[contains(concat(" ",@class," "),concat(" ","' .
|
|
implode(
|
|
'"," "))][contains(concat(" ",@class," "),concat(" ","',
|
|
explode('.', substr($match[2], 1))
|
|
) . '"," "))]';
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return string
|
|
*/
|
|
private function translateNthChild(array $match)
|
|
{
|
|
$result = $this->parseNth($match);
|
|
|
|
if (isset($result[self::MULTIPLIER])) {
|
|
if ($result[self::MULTIPLIER] < 0) {
|
|
$result[self::MULTIPLIER] = abs($result[self::MULTIPLIER]);
|
|
return sprintf(
|
|
'*[(last() - position()) mod %u = %u]/self::%s',
|
|
$result[self::MULTIPLIER],
|
|
$result[self::INDEX],
|
|
$match[1]
|
|
);
|
|
} else {
|
|
return sprintf(
|
|
'*[position() mod %u = %u]/self::%s',
|
|
$result[self::MULTIPLIER],
|
|
$result[self::INDEX],
|
|
$match[1]
|
|
);
|
|
}
|
|
} else {
|
|
return sprintf('*[%u]/self::%s', $result[self::INDEX], $match[1]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return string
|
|
*/
|
|
private function translateNthOfType(array $match)
|
|
{
|
|
$result = $this->parseNth($match);
|
|
|
|
if (isset($result[self::MULTIPLIER])) {
|
|
if ($result[self::MULTIPLIER] < 0) {
|
|
$result[self::MULTIPLIER] = abs($result[self::MULTIPLIER]);
|
|
return sprintf(
|
|
'%s[(last() - position()) mod %u = %u]',
|
|
$match[1],
|
|
$result[self::MULTIPLIER],
|
|
$result[self::INDEX]
|
|
);
|
|
} else {
|
|
return sprintf(
|
|
'%s[position() mod %u = %u]',
|
|
$match[1],
|
|
$result[self::MULTIPLIER],
|
|
$result[self::INDEX]
|
|
);
|
|
}
|
|
} else {
|
|
return sprintf('%s[%u]', $match[1], $result[self::INDEX]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return int[]
|
|
*/
|
|
private function parseNth(array $match)
|
|
{
|
|
if (in_array(strtolower($match[2]), array('even','odd'), true)) {
|
|
$index = strtolower($match[2]) === 'even' ? 0 : 1;
|
|
return array(self::MULTIPLIER => 2, self::INDEX => $index);
|
|
} elseif (stripos($match[2], 'n') === false) {
|
|
// if there is a multiplier
|
|
$index = (int) str_replace(' ', '', $match[2]);
|
|
return array(self::INDEX => $index);
|
|
} else {
|
|
if (isset($match[3])) {
|
|
$multipleTerm = str_replace($match[3], '', $match[2]);
|
|
$index = (int) str_replace(' ', '', $match[3]);
|
|
} else {
|
|
$multipleTerm = $match[2];
|
|
$index = 0;
|
|
}
|
|
|
|
$multiplier = (int) str_ireplace('n', '', $multipleTerm);
|
|
|
|
if (!strlen($multiplier)) {
|
|
$multiplier = 1;
|
|
} elseif ($multiplier === 0) {
|
|
return array(self::INDEX => $index);
|
|
} else {
|
|
$multiplier = (int) $multiplier;
|
|
}
|
|
|
|
while ($index < 0) {
|
|
$index += abs($multiplier);
|
|
}
|
|
|
|
return array(self::MULTIPLIER => $multiplier, self::INDEX => $index);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parses a CSS declaration block into property name/value pairs.
|
|
*
|
|
* Example:
|
|
*
|
|
* The declaration block
|
|
*
|
|
* "color: #000; font-weight: bold;"
|
|
*
|
|
* will be parsed into the following array:
|
|
*
|
|
* "color" => "#000"
|
|
* "font-weight" => "bold"
|
|
*
|
|
* @param string $cssDeclarationBlock the CSS declaration block without the curly braces, may be empty
|
|
*
|
|
* @return string[]
|
|
* the CSS declarations with the property names as array keys and the property values as array values
|
|
*/
|
|
private function parseCssDeclarationBlock($cssDeclarationBlock)
|
|
{
|
|
if (isset($this->caches[self::CACHE_KEY_CSS_DECLARATION_BLOCK][$cssDeclarationBlock])) {
|
|
return $this->caches[self::CACHE_KEY_CSS_DECLARATION_BLOCK][$cssDeclarationBlock];
|
|
}
|
|
|
|
$properties = array();
|
|
$declarations = explode(';', $cssDeclarationBlock);
|
|
foreach ($declarations as $declaration) {
|
|
$matches = array();
|
|
if (!preg_match('/ *([A-Za-z\\-]+) *: *([^;]+) */', $declaration, $matches)) {
|
|
continue;
|
|
}
|
|
$propertyName = strtolower($matches[1]);
|
|
$propertyValue = $matches[2];
|
|
$properties[$propertyName] = $propertyValue;
|
|
}
|
|
$this->caches[self::CACHE_KEY_CSS_DECLARATION_BLOCK][$cssDeclarationBlock] = $properties;
|
|
|
|
return $properties;
|
|
}
|
|
}
|