1232 lines
33 KiB
PHP
1232 lines
33 KiB
PHP
<?php
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/**
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* This class provides functions for converting CSS styles into inline style attributes in your HTML code.
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*
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* For more information, please see the README.md file.
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*
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* @version 1.0.0
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*
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* @author Cameron Brooks
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* @author Jaime Prado
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* @author Oliver Klee <typo3-coding@oliverklee.de>
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* @author Roman Ožana <ozana@omdesign.cz>
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*/
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// @codingStandardsIgnoreFile
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class Emogrifier
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{
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/**
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* @var int
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*/
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const CACHE_KEY_CSS = 0;
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/**
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* @var int
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*/
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const CACHE_KEY_SELECTOR = 1;
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/**
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* @var int
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*/
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const CACHE_KEY_XPATH = 2;
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/**
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* @var int
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*/
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const CACHE_KEY_CSS_DECLARATIONS_BLOCK = 3;
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/**
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* @var int
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*/
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const CACHE_KEY_COMBINED_STYLES = 4;
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/**
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* for calculating nth-of-type and nth-child selectors
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*
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* @var int
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*/
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const INDEX = 0;
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/**
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* for calculating nth-of-type and nth-child selectors
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*
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* @var int
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*/
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const MULTIPLIER = 1;
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/**
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* @var string
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*/
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const ID_ATTRIBUTE_MATCHER = '/(\\w+)?\\#([\\w\\-]+)/';
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/**
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* @var string
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*/
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const CLASS_ATTRIBUTE_MATCHER = '/(\\w+|[\\*\\]])?((\\.[\\w\\-]+)+)/';
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/**
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* @var string
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*/
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const CONTENT_TYPE_META_TAG = '<meta http-equiv="Content-Type" content="text/html; charset=utf-8">';
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/**
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* @var string
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*/
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const DEFAULT_DOCUMENT_TYPE = '<!DOCTYPE html>';
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/**
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* @var string
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*/
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private $html = '';
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/**
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* @var string
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*/
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private $css = '';
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/**
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* @var bool[]
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*/
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private $excludedSelectors = array();
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/**
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* @var string[]
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*/
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private $unprocessableHtmlTags = array( 'wbr' );
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/**
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* @var bool[]
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*/
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private $allowedMediaTypes = array( 'all' => true, 'screen' => true, 'print' => true );
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/**
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* @var array[]
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*/
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private $caches = array(
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self::CACHE_KEY_CSS => array(),
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self::CACHE_KEY_SELECTOR => array(),
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self::CACHE_KEY_XPATH => array(),
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self::CACHE_KEY_CSS_DECLARATIONS_BLOCK => array(),
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self::CACHE_KEY_COMBINED_STYLES => array(),
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);
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/**
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* the visited nodes with the XPath paths as array keys
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*
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* @var DoMElement[]
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*/
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private $visitedNodes = array();
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/**
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* the styles to apply to the nodes with the XPath paths as array keys for the outer array
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* and the attribute names/values as key/value pairs for the inner array
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*
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* @var array[]
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*/
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private $styleAttributesForNodes = array();
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/**
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* Determines whether the "style" attributes of tags in the the HTML passed to this class should be preserved.
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* If set to false, the value of the style attributes will be discarded.
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*
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* @var bool
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*/
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private $isInlineStyleAttributesParsingEnabled = true;
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/**
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* Determines whether the <style> blocks in the HTML passed to this class should be parsed.
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*
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* If set to true, the <style> blocks will be removed from the HTML and their contents will be applied to the HTML
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* via inline styles.
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*
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* If set to false, the <style> blocks will be left as they are in the HTML.
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*
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* @var bool
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*/
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private $isStyleBlocksParsingEnabled = true;
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/**
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* Determines whether elements with the `display: none` property are
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* removed from the DOM.
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*
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* @var bool
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*/
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private $shouldKeepInvisibleNodes = true;
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public static $_media = '';
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/**
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* The constructor.
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*
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* @param string $html the HTML to emogrify, must be UTF-8-encoded
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* @param string $css the CSS to merge, must be UTF-8-encoded
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*/
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public function __construct( $html = '', $css = '' ) {
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$this->setHtml($html);
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$this->setCss($css);
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}
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/**
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* The destructor.
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*/
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public function __destruct() {
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$this->purgeVisitedNodes();
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}
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/**
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* Sets the HTML to emogrify.
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*
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* @param string $html the HTML to emogrify, must be UTF-8-encoded
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*
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* @return void
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*/
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public function setHtml( $html ) {
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$this->html = $html;
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}
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/**
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* Sets the CSS to merge with the HTML.
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*
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* @param string $css the CSS to merge, must be UTF-8-encoded
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*
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* @return void
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*/
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public function setCss( $css ) {
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$this->css = $css;
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}
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/**
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* Applies $this->css to $this->html and returns the HTML with the CSS
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* applied.
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*
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* This method places the CSS inline.
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*
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* @return string
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*
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* @throws BadMethodCallException
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*/
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public function emogrify() {
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if ( $this->html === '' ) {
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throw new BadMethodCallException('Please set some HTML first before calling emogrify.', 1390393096);
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}
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self::$_media = ''; // reset
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$xmlDocument = $this->createXmlDocument();
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$this->process($xmlDocument);
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return $xmlDocument->saveHTML();
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}
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/**
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* Applies $this->css to $this->html and returns only the HTML content
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* within the <body> tag.
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*
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* This method places the CSS inline.
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*
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* @return string
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*
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* @throws BadMethodCallException
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*/
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public function emogrifyBodyContent() {
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if ( $this->html === '' ) {
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throw new BadMethodCallException('Please set some HTML first before calling emogrify.', 1390393096);
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}
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$xmlDocument = $this->createXmlDocument();
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$this->process($xmlDocument);
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$innerDocument = new DoMDocument();
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foreach ( $xmlDocument->documentElement->getElementsByTagName('body')->item(0)->childNodes as $childNode ) {
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$innerDocument->appendChild($innerDocument->importNode($childNode, true));
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}
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return $innerDocument->saveHTML();
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}
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/**
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* Applies $this->css to $xmlDocument.
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*
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* This method places the CSS inline.
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*
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* @param DoMDocument $xmlDocument
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*
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* @return void
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*/
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protected function process( DoMDocument $xmlDocument ) {
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$xpath = new DoMXPath($xmlDocument);
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$this->clearAllCaches();
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// Before be begin processing the CSS file, parse the document and normalize all existing CSS attributes.
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// This changes 'DISPLAY: none' to 'display: none'.
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// We wouldn't have to do this if DOMXPath supported XPath 2.0.
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// Also store a reference of nodes with existing inline styles so we don't overwrite them.
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$this->purgeVisitedNodes();
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$nodesWithStyleAttributes = $xpath->query('//*[@style]');
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if ( $nodesWithStyleAttributes !== false ) {
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/** @var DoMElement $node */
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foreach ( $nodesWithStyleAttributes as $node ) {
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if ( $this->isInlineStyleAttributesParsingEnabled ) {
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$this->normalizeStyleAttributes($node);
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} else {
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$node->removeAttribute('style');
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}
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}
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}
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// grab any existing style blocks from the html and append them to the existing CSS
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// (these blocks should be appended so as to have precedence over conflicting styles in the existing CSS)
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$allCss = $this->css;
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if ( $this->isStyleBlocksParsingEnabled ) {
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$allCss .= $this->getCssFromAllStyleNodes($xpath);
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}
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$cssParts = $this->splitCssAndMediaQuery($allCss);
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$excludedNodes = $this->getNodesToExclude($xpath);
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$cssRules = $this->parseCssRules($cssParts['css']);
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foreach ( $cssRules as $cssRule ) {
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// query the body for the xpath selector
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$nodesMatchingCssSelectors = $xpath->query($this->translateCssToXpath($cssRule['selector']));
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// ignore invalid selectors
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if ( $nodesMatchingCssSelectors === false ) {
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continue;
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}
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/** @var DoMElement $node */
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foreach ( $nodesMatchingCssSelectors as $node ) {
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if ( in_array($node, $excludedNodes, true) ) {
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continue;
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}
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// if it has a style attribute, get it, process it, and append (overwrite) new stuff
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if ( $node->hasAttribute('style') ) {
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// break it up into an associative array
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$oldStyleDeclarations = $this->parseCssDeclarationsBlock($node->getAttribute('style'));
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} else {
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$oldStyleDeclarations = array();
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}
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$newStyleDeclarations = $this->parseCssDeclarationsBlock($cssRule['declarationsBlock']);
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$node->setAttribute(
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'style',
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$this->generateStyleStringFromDeclarationsArrays($oldStyleDeclarations, $newStyleDeclarations)
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);
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}
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}
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if ( $this->isInlineStyleAttributesParsingEnabled ) {
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$this->fillStyleAttributesWithMergedStyles();
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}
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if ( $this->shouldKeepInvisibleNodes ) {
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$this->removeInvisibleNodes($xpath);
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}
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$this->copyCssWithMediaToStyleNode($xmlDocument, $xpath, $cssParts['media']);
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}
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/**
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* Extracts and parses the individual rules from a CSS string.
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*
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* @param string $css a string of raw CSS code
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*
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* @return string[][] an array of string sub-arrays with the keys
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* "selector" (the CSS selector(s), e.g., "*" or "h1"),
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* "declarationsBLock" (the semicolon-separated CSS declarations for that selector(s),
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* e.g., "color: red; height: 4px;"),
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* and "line" (the line number e.g. 42)
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*/
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private function parseCssRules( $css ) {
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$cssKey = md5($css);
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if ( ! isset($this->caches[ self::CACHE_KEY_CSS ][ $cssKey ]) ) {
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// process the CSS file for selectors and definitions
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preg_match_all('/(?:^|[\\s^{}]*)([^{]+){([^}]*)}/mis', $css, $matches, PREG_SET_ORDER);
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$cssRules = array();
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/** @var string[] $cssRule */
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foreach ( $matches as $key => $cssRule ) {
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$cssDeclaration = trim($cssRule[2]);
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if ( $cssDeclaration === '' ) {
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continue;
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}
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$selectors = explode(',', $cssRule[1]);
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foreach ( $selectors as $selector ) {
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// don't process pseudo-elements and behavioral (dynamic) pseudo-classes;
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// only allow structural pseudo-classes
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if ( strpos($selector, ':') !== false && ! preg_match('/:\\S+\\-(child|type\\()/i', $selector) ) {
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continue;
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}
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$cssRules[] = array(
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'selector' => trim($selector),
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'declarationsBlock' => $cssDeclaration,
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// keep track of where it appears in the file, since order is important
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'line' => $key,
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);
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}
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}
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usort($cssRules, array( $this, 'sortBySelectorPrecedence' ) );
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$this->caches[ self::CACHE_KEY_CSS ][ $cssKey ] = $cssRules;
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}
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return $this->caches[ self::CACHE_KEY_CSS ][ $cssKey ];
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}
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/**
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* Disables the parsing of inline styles.
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*
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* @return void
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*/
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public function disableInlineStyleAttributesParsing() {
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$this->isInlineStyleAttributesParsingEnabled = false;
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}
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/**
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* Disables the parsing of <style> blocks.
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*
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* @return void
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*/
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public function disableStyleBlocksParsing() {
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$this->isStyleBlocksParsingEnabled = false;
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}
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/**
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* Disables the removal of elements with `display: none` properties.
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*
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* @return void
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*/
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public function disableInvisibleNodeRemoval() {
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$this->shouldKeepInvisibleNodes = false;
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}
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/**
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* Clears all caches.
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*
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* @return void
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*/
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private function clearAllCaches() {
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$this->clearCache(self::CACHE_KEY_CSS);
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$this->clearCache(self::CACHE_KEY_SELECTOR);
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$this->clearCache(self::CACHE_KEY_XPATH);
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$this->clearCache(self::CACHE_KEY_CSS_DECLARATIONS_BLOCK);
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$this->clearCache(self::CACHE_KEY_COMBINED_STYLES);
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}
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/**
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* Clears a single cache by key.
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*
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* @param int $key the cache key, must be CACHE_KEY_CSS, CACHE_KEY_SELECTOR, CACHE_KEY_XPATH
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* or CACHE_KEY_CSS_DECLARATION_BLOCK
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*
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* @return void
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*
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* @throws \InvalidArgumentException
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*/
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private function clearCache( $key ) {
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$allowedCacheKeys = array(
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self::CACHE_KEY_CSS,
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self::CACHE_KEY_SELECTOR,
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self::CACHE_KEY_XPATH,
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self::CACHE_KEY_CSS_DECLARATIONS_BLOCK,
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self::CACHE_KEY_COMBINED_STYLES,
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);
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if ( ! in_array($key, $allowedCacheKeys, true) ) {
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throw new InvalidArgumentException('Invalid cache key: ' . $key, 1391822035);
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}
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$this->caches[ $key ] = array();
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}
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/**
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* Purges the visited nodes.
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*
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* @return void
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*/
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private function purgeVisitedNodes() {
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$this->visitedNodes = array();
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$this->styleAttributesForNodes = array();
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}
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/**
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* Marks a tag for removal.
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*
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* There are some HTML tags that DOMDocument cannot process, and it will throw an error if it encounters them.
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* In particular, DOMDocument will complain if you try to use HTML5 tags in an XHTML document.
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*
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* Note: The tags will not be removed if they have any content.
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*
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* @param string $tagName the tag name, e.g., "p"
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*
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* @return void
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*/
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public function addUnprocessableHtmlTag( $tagName ) {
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$this->unprocessableHtmlTags[] = $tagName;
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}
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/**
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* Drops a tag from the removal list.
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*
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* @param string $tagName the tag name, e.g., "p"
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*
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* @return void
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*/
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public function removeUnprocessableHtmlTag( $tagName ) {
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$key = array_search($tagName, $this->unprocessableHtmlTags, true);
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if ( $key !== false ) {
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unset($this->unprocessableHtmlTags[ $key ]);
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}
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}
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/**
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* Marks a media query type to keep.
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*
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* @param string $mediaName the media type name, e.g., "braille"
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*
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* @return void
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*/
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public function addAllowedMediaType( $mediaName ) {
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$this->allowedMediaTypes[ $mediaName ] = true;
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}
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/**
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* Drops a media query type from the allowed list.
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*
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* @param string $mediaName the tag name, e.g., "braille"
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*
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* @return void
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*/
|
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public function removeAllowedMediaType( $mediaName ) {
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if ( isset($this->allowedMediaTypes[ $mediaName ]) ) {
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unset($this->allowedMediaTypes[ $mediaName ]);
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}
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}
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|
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/**
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* Adds a selector to exclude nodes from emogrification.
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*
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* Any nodes that match the selector will not have their style altered.
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*
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* @param string $selector the selector to exclude, e.g., ".editor"
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*
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* @return void
|
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*/
|
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public function addExcludedSelector( $selector ) {
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$this->excludedSelectors[ $selector ] = true;
|
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}
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|
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/**
|
|
* No longer excludes the nodes matching this selector from emogrification.
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*
|
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* @param string $selector the selector to no longer exclude, e.g., ".editor"
|
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*
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* @return void
|
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*/
|
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public function removeExcludedSelector( $selector ) {
|
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if ( isset($this->excludedSelectors[ $selector ]) ) {
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unset($this->excludedSelectors[ $selector ]);
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}
|
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}
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|
|
/**
|
|
* This removes styles from your email that contain display:none.
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|
* We need to look for display:none, but we need to do a case-insensitive search. Since DOMDocument only
|
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* supports XPath 1.0, lower-case() isn't available to us. We've thus far only set attributes to lowercase,
|
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* not attribute values. Consequently, we need to translate() the letters that would be in 'NONE' ("NOE")
|
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* to lowercase.
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*
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* @param DoMXPath $xpath
|
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*
|
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* @return void
|
|
*/
|
|
private function removeInvisibleNodes( DoMXPath $xpath ) {
|
|
$nodesWithStyleDisplayNone = $xpath->query(
|
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'//*[contains(translate(translate(@style," ",""),"NOE","noe"),"display:none")]'
|
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);
|
|
if ( $nodesWithStyleDisplayNone->length === 0 ) {
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return;
|
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}
|
|
|
|
// 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
|
|
/** @var DoMNode $node */
|
|
foreach ( $nodesWithStyleDisplayNone as $node ) {
|
|
if ( $node->parentNode && is_callable( array( $node->parentNode, 'removeChild' ) ) ) {
|
|
$node->parentNode->removeChild($node);
|
|
}
|
|
}
|
|
}
|
|
|
|
private function normalizeStyleAttributes_callback( $m ) {
|
|
return strtolower( $m[0] );
|
|
}
|
|
|
|
/**
|
|
* 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',
|
|
array( $this, 'normalizeStyleAttributes_callback' ),
|
|
$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 ] = $this->parseCssDeclarationsBlock($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 = $this->parseCssDeclarationsBlock($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);
|
|
$cacheKey = serialize( $combinedStyles );
|
|
if ( isset($this->caches[ self::CACHE_KEY_COMBINED_STYLES ][ $cacheKey ]) ) {
|
|
return $this->caches[ self::CACHE_KEY_COMBINED_STYLES ][ $cacheKey ];
|
|
}
|
|
|
|
foreach ( $oldStyles as $attributeName => $attributeValue ) {
|
|
if ( isset($newStyles[ $attributeName ]) && strtolower(substr($attributeValue, -10)) === '!important' ) {
|
|
$combinedStyles[ $attributeName ] = $attributeValue;
|
|
}
|
|
}
|
|
|
|
$style = '';
|
|
foreach ( $combinedStyles as $attributeName => $attributeValue ) {
|
|
$style .= strtolower(trim($attributeName)) . ': ' . trim($attributeValue) . '; ';
|
|
}
|
|
$trimmedStyle = rtrim($style);
|
|
|
|
$this->caches[ self::CACHE_KEY_COMBINED_STYLES ][ $cacheKey ] = $trimmedStyle;
|
|
|
|
return $trimmedStyle;
|
|
}
|
|
|
|
/**
|
|
* Applies $css to $xmlDocument, limited to the media queries that actually apply to the document.
|
|
*
|
|
* @param DoMDocument $xmlDocument the document to match against
|
|
* @param DoMXPath $xpath
|
|
* @param string $css a string of CSS
|
|
*
|
|
* @return void
|
|
*/
|
|
private function copyCssWithMediaToStyleNode( DoMDocument $xmlDocument, DoMXPath $xpath, $css ) {
|
|
if ( $css === '' ) {
|
|
return;
|
|
}
|
|
|
|
$mediaQueriesRelevantForDocument = array();
|
|
|
|
foreach ( $this->extractMediaQueriesFromCss($css) as $mediaQuery ) {
|
|
foreach ( $this->parseCssRules($mediaQuery['css']) as $selector ) {
|
|
if ( $this->existsMatchForCssSelector($xpath, $selector['selector']) ) {
|
|
$mediaQueriesRelevantForDocument[] = $mediaQuery['query'];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->addStyleElementToDocument($xmlDocument, implode($mediaQueriesRelevantForDocument));
|
|
}
|
|
|
|
/**
|
|
* Extracts the media queries from $css.
|
|
*
|
|
* @param string $css
|
|
*
|
|
* @return string[][] numeric array with string sub-arrays with the keys "css" and "query"
|
|
*/
|
|
private function extractMediaQueriesFromCss( $css ) {
|
|
preg_match_all('#(?<query>@media[^{]*\\{(?<css>(.*?)\\})(\\s*)\\})#s', $css, $mediaQueries);
|
|
$result = array();
|
|
foreach ( array_keys($mediaQueries['css']) as $key ) {
|
|
$result[] = array(
|
|
'css' => $mediaQueries['css'][ $key ],
|
|
'query' => $mediaQueries['query'][ $key ],
|
|
);
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Checks whether there is at least one matching element for $cssSelector.
|
|
*
|
|
* @param DoMXPath $xpath
|
|
* @param string $cssSelector
|
|
*
|
|
* @return bool
|
|
*/
|
|
private function existsMatchForCssSelector( DoMXPath $xpath, $cssSelector ) {
|
|
$nodesMatchingSelector = $xpath->query($this->translateCssToXpath($cssSelector));
|
|
|
|
return $nodesMatchingSelector !== false && $nodesMatchingSelector->length !== 0;
|
|
}
|
|
|
|
/**
|
|
* Returns CSS content.
|
|
*
|
|
* @param DoMXPath $xpath
|
|
*
|
|
* @return string
|
|
*/
|
|
private function getCssFromAllStyleNodes( DoMXPath $xpath ) {
|
|
$styleNodes = $xpath->query('//style');
|
|
|
|
if ( $styleNodes === false ) {
|
|
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;
|
|
}
|
|
|
|
private function splitCssAndMediaQuery_callback() {
|
|
|
|
}
|
|
|
|
/**
|
|
* 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 array
|
|
*/
|
|
private function splitCssAndMediaQuery( $css ) {
|
|
$css = preg_replace_callback( '#@media\\s+(?:only\\s)?(?:[\\s{\(]|screen|all)\\s?[^{]+{.*}\\s*}\\s*#misU', array( $this, '_media_concat' ), $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' => $css, 'media' => self::$_media );
|
|
}
|
|
|
|
private function _media_concat( $matches ) {
|
|
self::$_media .= $matches[0];
|
|
}
|
|
|
|
/**
|
|
* Creates a DOMDocument instance with the current HTML.
|
|
*
|
|
* @return DoMDocument
|
|
*/
|
|
private function createXmlDocument() {
|
|
$xmlDocument = new DoMDocument;
|
|
$xmlDocument->encoding = 'UTF-8';
|
|
$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 unprocessable HTML tags removed and
|
|
* with added document type and Content-Type meta tag if needed.
|
|
*
|
|
* @return string the unified HTML
|
|
*
|
|
* @throws BadMethodCallException
|
|
*/
|
|
private function getUnifiedHtml() {
|
|
$htmlWithoutUnprocessableTags = $this->removeUnprocessableTags($this->html);
|
|
$htmlWithDocumentType = $this->ensureDocumentType($htmlWithoutUnprocessableTags);
|
|
|
|
return $this->addContentTypeMetaTag($htmlWithDocumentType);
|
|
}
|
|
|
|
/**
|
|
* Removes the unprocessable tags from $html (if this feature is enabled).
|
|
*
|
|
* @param string $html
|
|
*
|
|
* @return string the reworked HTML with the unprocessable tags removed
|
|
*/
|
|
private function removeUnprocessableTags( $html ) {
|
|
if ( empty($this->unprocessableHtmlTags) ) {
|
|
return $html;
|
|
}
|
|
|
|
$unprocessableHtmlTags = implode('|', $this->unprocessableHtmlTags);
|
|
|
|
return preg_replace(
|
|
'/<\\/?(' . $unprocessableHtmlTags . ')[^>]*>/i',
|
|
'',
|
|
$html
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Makes sure that the passed HTML has a document type.
|
|
*
|
|
* @param string $html
|
|
*
|
|
* @return string HTML with document type
|
|
*/
|
|
private function ensureDocumentType( $html ) {
|
|
$hasDocumentType = stripos($html, '<!DOCTYPE') !== false;
|
|
if ( $hasDocumentType ) {
|
|
return $html;
|
|
}
|
|
|
|
return self::DEFAULT_DOCUMENT_TYPE . $html;
|
|
}
|
|
|
|
/**
|
|
* Adds a Content-Type meta tag for the charset.
|
|
*
|
|
* @param string $html
|
|
*
|
|
* @return string the HTML with the meta tag added
|
|
*/
|
|
private function addContentTypeMetaTag( $html ) {
|
|
$hasContentTypeMetaTag = stristr($html, 'Content-Type') !== false;
|
|
if ( $hasContentTypeMetaTag ) {
|
|
return $html;
|
|
|
|
}
|
|
|
|
// We are trying to insert the meta tag to the right spot in the DOM.
|
|
// If we just prepended it to the HTML, we would lose attributes set to the HTML tag.
|
|
$hasHeadTag = stripos($html, '<head') !== false;
|
|
$hasHtmlTag = stripos($html, '<html') !== false;
|
|
|
|
if ( $hasHeadTag ) {
|
|
$reworkedHtml = preg_replace('/<head(.*?)>/i', '<head$1>' . self::CONTENT_TYPE_META_TAG, $html);
|
|
} elseif ( $hasHtmlTag ) {
|
|
$reworkedHtml = preg_replace(
|
|
'/<html(.*?)>/i',
|
|
'<html$1><head>' . self::CONTENT_TYPE_META_TAG . '</head>',
|
|
$html
|
|
);
|
|
} else {
|
|
$reworkedHtml = self::CONTENT_TYPE_META_TAG . $html;
|
|
}
|
|
|
|
return $reworkedHtml;
|
|
}
|
|
|
|
/**
|
|
* @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 ];
|
|
}
|
|
|
|
private function translateCssToXpath_callback( $matches ) {
|
|
return strtolower($matches[0]);
|
|
}
|
|
|
|
/**
|
|
* Maps a CSS selector to an XPath query string.
|
|
*
|
|
* @see http://plasmasturm.org/log/444/
|
|
*
|
|
* @param string $cssSelector a CSS selector
|
|
*
|
|
* @return string the corresponding XPath selector
|
|
*/
|
|
private function translateCssToXpath( $cssSelector ) {
|
|
$paddedSelector = ' ' . $cssSelector . ' ';
|
|
$lowercasePaddedSelector = preg_replace_callback(
|
|
'/\\s+\\w+\\s+/',
|
|
array( $this, 'translateCssToXpath_callback' ),
|
|
$paddedSelector
|
|
);
|
|
$trimmedLowercaseSelector = trim($lowercasePaddedSelector);
|
|
$xpathKey = md5($trimmedLowercaseSelector);
|
|
if ( ! isset($this->caches[ self::CACHE_KEY_XPATH ][ $xpathKey ]) ) {
|
|
$cssSelectorMatches = array(
|
|
'child' => '/\\s+>\\s+/',
|
|
'adjacent sibling' => '/\\s+\\+\\s+/',
|
|
'descendant' => '/\\s+/',
|
|
':first-child' => '/([^\\/]+):first-child/i',
|
|
':last-child' => '/([^\\/]+):last-child/i',
|
|
'attribute only' => '/^\\[(\\w+|\\w+\\=[\'"]?\\w+[\'"]?)\\]/',
|
|
'attribute' => '/(\\w)\\[(\\w+)\\]/',
|
|
'exact attribute' => '/(\\w)\\[(\\w+)\\=[\'"]?(\\w+)[\'"]?\\]/',
|
|
);
|
|
$xPathReplacements = array(
|
|
'child' => '/',
|
|
'adjacent sibling' => '/following-sibling::*[1]/self::',
|
|
'descendant' => '//',
|
|
':first-child' => '\\1/*[1]',
|
|
':last-child' => '\\1/*[last()]',
|
|
'attribute only' => '*[@\\1]',
|
|
'attribute' => '\\1[@\\2]',
|
|
'exact attribute' => '\\1[@\\2="\\3"]',
|
|
);
|
|
|
|
$roughXpath = '//' . preg_replace($cssSelectorMatches, $xPathReplacements, $trimmedLowercaseSelector);
|
|
|
|
$xpathWithIdAttributeMatchers = preg_replace_callback(
|
|
self::ID_ATTRIBUTE_MATCHER,
|
|
array( $this, 'matchIdAttributes' ),
|
|
$roughXpath
|
|
);
|
|
$xpathWithIdAttributeAndClassMatchers = preg_replace_callback(
|
|
self::CLASS_ATTRIBUTE_MATCHER,
|
|
array( $this, 'matchClassAttributes' ),
|
|
$xpathWithIdAttributeMatchers
|
|
);
|
|
|
|
// Advanced selectors are going to require a bit more advanced emogrification.
|
|
// When we required PHP 5.3, we could do this with closures.
|
|
$xpathWithIdAttributeAndClassMatchers = preg_replace_callback(
|
|
'/([^\\/]+):nth-child\\(\\s*(odd|even|[+\\-]?\\d|[+\\-]?\\d?n(\\s*[+\\-]\\s*\\d)?)\\s*\\)/i',
|
|
array( $this, 'translateNthChild' ),
|
|
$xpathWithIdAttributeAndClassMatchers
|
|
);
|
|
$finalXpath = preg_replace_callback(
|
|
'/([^\\/]+):nth-of-type\\(\s*(odd|even|[+\\-]?\\d|[+\\-]?\\d?n(\\s*[+\\-]\\s*\\d)?)\\s*\\)/i',
|
|
array( $this, 'translateNthOfType' ),
|
|
$xpathWithIdAttributeAndClassMatchers
|
|
);
|
|
|
|
$this->caches[ self::CACHE_KEY_SELECTOR ][ $xpathKey ] = $finalXpath;
|
|
}
|
|
return $this->caches[ self::CACHE_KEY_SELECTOR ][ $xpathKey ];
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return string
|
|
*/
|
|
private function matchIdAttributes( array $match ) {
|
|
return ($match[1] !== '' ? $match[1] : '*') . '[@id="' . $match[2] . '"]';
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return string
|
|
*/
|
|
private function matchClassAttributes( array $match ) {
|
|
return ($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 ) {
|
|
$parseResult = $this->parseNth($match);
|
|
|
|
if ( isset($parseResult[ self::MULTIPLIER ]) ) {
|
|
if ( $parseResult[ self::MULTIPLIER ] < 0 ) {
|
|
$parseResult[ self::MULTIPLIER ] = abs($parseResult[ self::MULTIPLIER ]);
|
|
$xPathExpression = sprintf(
|
|
'*[(last() - position()) mod %u = %u]/self::%s',
|
|
$parseResult[ self::MULTIPLIER ],
|
|
$parseResult[ self::INDEX ],
|
|
$match[1]
|
|
);
|
|
} else {
|
|
$xPathExpression = sprintf(
|
|
'*[position() mod %u = %u]/self::%s',
|
|
$parseResult[ self::MULTIPLIER ],
|
|
$parseResult[ self::INDEX ],
|
|
$match[1]
|
|
);
|
|
}
|
|
} else {
|
|
$xPathExpression = sprintf('*[%u]/self::%s', $parseResult[ self::INDEX ], $match[1]);
|
|
}
|
|
|
|
return $xPathExpression;
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return string
|
|
*/
|
|
private function translateNthOfType( array $match ) {
|
|
$parseResult = $this->parseNth($match);
|
|
|
|
if ( isset($parseResult[ self::MULTIPLIER ]) ) {
|
|
if ( $parseResult[ self::MULTIPLIER ] < 0 ) {
|
|
$parseResult[ self::MULTIPLIER ] = abs($parseResult[ self::MULTIPLIER ]);
|
|
$xPathExpression = sprintf(
|
|
'%s[(last() - position()) mod %u = %u]',
|
|
$match[1],
|
|
$parseResult[ self::MULTIPLIER ],
|
|
$parseResult[ self::INDEX ]
|
|
);
|
|
} else {
|
|
$xPathExpression = sprintf(
|
|
'%s[position() mod %u = %u]',
|
|
$match[1],
|
|
$parseResult[ self::MULTIPLIER ],
|
|
$parseResult[ self::INDEX ]
|
|
);
|
|
}
|
|
} else {
|
|
$xPathExpression = sprintf('%s[%u]', $match[1], $parseResult[ self::INDEX ]);
|
|
}
|
|
|
|
return $xPathExpression;
|
|
}
|
|
|
|
/**
|
|
* @param string[] $match
|
|
*
|
|
* @return int[]
|
|
*/
|
|
private function parseNth( array $match ) {
|
|
if ( in_array(strtolower($match[2]), array( 'even', 'odd' ), true) ) {
|
|
// we have "even" or "odd"
|
|
$index = strtolower($match[2]) === 'even' ? 0 : 1;
|
|
return array( self::MULTIPLIER => 2, self::INDEX => $index );
|
|
}
|
|
if ( stripos($match[2], 'n') === false ) {
|
|
// if there is a multiplier
|
|
$index = (int) str_replace(' ', '', $match[2]);
|
|
return array( self::INDEX => $index );
|
|
}
|
|
|
|
if ( isset($match[3]) ) {
|
|
$multipleTerm = str_replace($match[3], '', $match[2]);
|
|
$index = (int) str_replace(' ', '', $match[3]);
|
|
} else {
|
|
$multipleTerm = $match[2];
|
|
$index = 0;
|
|
}
|
|
|
|
$multiplier = str_ireplace('n', '', $multipleTerm);
|
|
|
|
if ( $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 $cssDeclarationsBlock the CSS declarations 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 parseCssDeclarationsBlock( $cssDeclarationsBlock ) {
|
|
if ( isset($this->caches[ self::CACHE_KEY_CSS_DECLARATIONS_BLOCK ][ $cssDeclarationsBlock ]) ) {
|
|
return $this->caches[ self::CACHE_KEY_CSS_DECLARATIONS_BLOCK ][ $cssDeclarationsBlock ];
|
|
}
|
|
|
|
$properties = array();
|
|
$declarations = preg_split('/;(?!base64|charset)/', $cssDeclarationsBlock);
|
|
|
|
foreach ( $declarations as $declaration ) {
|
|
$matches = array();
|
|
if ( ! preg_match('/^([A-Za-z\\-]+)\\s*:\\s*(.+)$/', trim($declaration), $matches) ) {
|
|
continue;
|
|
}
|
|
|
|
$propertyName = strtolower($matches[1]);
|
|
$propertyValue = $matches[2];
|
|
$properties[ $propertyName ] = $propertyValue;
|
|
}
|
|
$this->caches[ self::CACHE_KEY_CSS_DECLARATIONS_BLOCK ][ $cssDeclarationsBlock ] = $properties;
|
|
|
|
return $properties;
|
|
}
|
|
|
|
/**
|
|
* Find the nodes that are not to be emogrified.
|
|
*
|
|
* @param DoMXPath $xpath
|
|
*
|
|
* @return DoMElement[]
|
|
*/
|
|
private function getNodesToExclude( DoMXPath $xpath ) {
|
|
$excludedNodes = array();
|
|
foreach ( array_keys($this->excludedSelectors) as $selectorToExclude ) {
|
|
foreach ( $xpath->query($this->translateCssToXpath($selectorToExclude)) as $node ) {
|
|
$excludedNodes[] = $node;
|
|
}
|
|
}
|
|
|
|
return $excludedNodes;
|
|
}
|
|
}
|