682 lines
24 KiB
PHP
682 lines
24 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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* @author Cameron Brooks
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* @author Jaime Prado
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*/
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class Emogrifier {
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/**
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* @var string
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*/
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const ENCODING = 'UTF-8';
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/**
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* @var integer
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*/
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const CACHE_KEY_CSS = 0;
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/**
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* @var integer
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*/
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const CACHE_KEY_SELECTOR = 1;
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/**
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* @var integer
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*/
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const CACHE_KEY_XPATH = 2;
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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 integer
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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 integer
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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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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 array<string>
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*/
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private $unprocessableHtmlTags = array('wbr');
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/**
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* @var array<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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);
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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 array<\DOMNode>
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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 and the attribute names/values
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* as key/value pairs for the inner array
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*
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* @var array<array><string>
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*/
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private $styleAttributesForNodes = array();
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/**
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* This attribute applies to the case where you want to preserve your original text encoding.
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*
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* By default, emogrifier translates your text into HTML entities for two reasons:
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*
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* 1. Because of client incompatibilities, it is better practice to send out HTML entities rather than unicode over email.
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*
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* 2. It translates any illegal XML characters that DOMDocument cannot work with.
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*
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* If you would like to preserve your original encoding, set this attribute to TRUE.
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*
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* @var boolean
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*/
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public $preserveEncoding = FALSE;
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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 = $css;
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}
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/**
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* Clears all caches.
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*
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* @return void
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*/
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private function clearAllCaches() {
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$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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}
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/**
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* Clears a single cache by key.
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*
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* @param integer $key the cache key, must be CACHE_KEY_CSS, CACHE_KEY_SELECTOR or CACHE_KEY_XPATH
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*
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* @return void
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*
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* @throws \InvalidArgumentException
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*/
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private function clearCache($key) {
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$allowedCacheKeys = array(self::CACHE_KEY_CSS, self::CACHE_KEY_SELECTOR, self::CACHE_KEY_XPATH);
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if (!in_array($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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* Applies the CSS you submit to the HTML you submit.
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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 ($this->html === '') {
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throw new BadMethodCallException('Please set some HTML first before calling emogrify.', 1390393096);
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}
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$xmlDocument = $this->createXmlDocument();
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$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 (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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$callback = create_function('$m', 'return strtolower($m[0]);');
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/** @var $nodeWithStyleAttribute \DOMNode */
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foreach ($nodesWithStyleAttributes as $node) {
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$normalizedOriginalStyle = preg_replace_callback(
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'/[A-z\\-]+(?=\\:)/S',
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$callback,
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$node->getAttribute('style')
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);
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// in order to not overwrite existing style attributes in the HTML, we have to save the original HTML styles
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$nodePath = $node->getNodePath();
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if (!isset($this->styleAttributesForNodes[$nodePath])) {
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$this->styleAttributesForNodes[$nodePath] = $this->parseCssDeclarationBlock($normalizedOriginalStyle);
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$this->visitedNodes[$nodePath] = $node;
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}
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$node->setAttribute('style', $normalizedOriginalStyle);
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}
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}
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// grab any existing style blocks from the html and append them to the existing CSS
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// (these blocks should be appended so as to have precedence over conflicting styles in the existing CSS)
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$css = $this->css;
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$styleNodes = $xpath->query('//style');
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if ($styleNodes !== FALSE) {
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/** @var $styleNode \DOMNode */
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foreach ($styleNodes as $styleNode) {
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// append the css
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$css .= "\n\n" . $styleNode->nodeValue;
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// remove the <style> node
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$styleNode->parentNode->removeChild($styleNode);
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}
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}
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// filter the CSS
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$search = array(
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// get rid of css comment code
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'/\\/\\*.*\\*\\//sU',
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// strip out any import directives
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'/^\\s*@import\\s[^;]+;/misU',
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// strip any empty media enclosures
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'/^\\s*@media\\s[^{]+{\\s*}/misU',
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// strip out all media rules that are not 'screen' or 'all' (these don't apply to email)
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'/^\\s*@media\\s+((aural|braille|embossed|handheld|print|projection|speech|tty|tv)\\s*,*\\s*)+{.*}\\s*}/misU',
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// get rid of remaining media type rules
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'/^\\s*@media\\s[^{]+{(.*})\\s*}/misU',
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);
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$replace = array(
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'',
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'',
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'',
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'',
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'\\1',
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);
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$css = preg_replace($search, $replace, $css);
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$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, $matches, PREG_SET_ORDER);
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$allSelectors = array();
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foreach ($matches as $key => $selectorString) {
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// if there is a blank definition, skip
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if (!strlen(trim($selectorString[2]))) {
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continue;
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}
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// else split by commas and duplicate attributes so we can sort by selector precedence
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$selectors = explode(',', $selectorString[1]);
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foreach ($selectors as $selector) {
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// don't process pseudo-elements and behavioral (dynamic) pseudo-classes; ONLY allow structural pseudo-classes
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if (strpos($selector, ':') !== FALSE && !preg_match('/:\\S+\\-(child|type)\\(/i', $selector)) {
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continue;
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}
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$allSelectors[] = array('selector' => trim($selector),
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'attributes' => trim($selectorString[2]),
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// keep track of where it appears in the file, since order is important
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'line' => $key,
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);
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}
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}
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// now sort the selectors by precedence
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usort($allSelectors, array($this,'sortBySelectorPrecedence'));
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$this->caches[self::CACHE_KEY_CSS][$cssKey] = $allSelectors;
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}
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foreach ($this->caches[self::CACHE_KEY_CSS][$cssKey] as $value) {
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// query the body for the xpath selector
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$nodesMatchingCssSelectors = $xpath->query($this->translateCssToXpath(trim($value['selector'])));
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/** @var $node \DOMNode */
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foreach ($nodesMatchingCssSelectors as $node) {
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// if it has a style attribute, get it, process it, and append (overwrite) new stuff
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if ($node->hasAttribute('style')) {
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// break it up into an associative array
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$oldStyleDeclarations = $this->parseCssDeclarationBlock($node->getAttribute('style'));
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$newStyleDeclarations = $this->parseCssDeclarationBlock($value['attributes']);
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// new styles overwrite the old styles (not technically accurate, but close enough)
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$combinedArray = array_merge($oldStyleDeclarations, $newStyleDeclarations);
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$style = '';
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foreach ($combinedArray as $attributeName => $attributeValue) {
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$style .= (strtolower($attributeName) . ':' . $attributeValue . ';');
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}
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} else {
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// otherwise create a new style
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$style = trim($value['attributes']);
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}
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$node->setAttribute('style', $style);
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}
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}
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// now iterate through the nodes that contained inline styles in the original HTML
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foreach ($this->styleAttributesForNodes as $nodePath => $styleAttributesForNode) {
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$node = $this->visitedNodes[$nodePath];
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$currentStyleAttributes = $this->parseCssDeclarationBlock($node->getAttribute('style'));
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$combinedArray = array_merge($currentStyleAttributes, $styleAttributesForNode);
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$style = '';
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foreach ($combinedArray as $attributeName => $attributeValue) {
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$style .= (strtolower($attributeName) . ':' . $attributeValue . ';');
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}
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$node->setAttribute('style', $style);
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}
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// This removes styles from your email that contain display:none.
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// We need to look for display:none, but we need to do a case-insensitive search. Since DOMDocument only supports XPath 1.0,
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// lower-case() isn't available to us. We've thus far only set attributes to lowercase, not attribute values. Consequently, we need
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// to translate() the letters that would be in 'NONE' ("NOE") to lowercase.
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$nodesWithStyleDisplayNone = $xpath->query('//*[contains(translate(translate(@style," ",""),"NOE","noe"),"display:none")]');
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// The checks on parentNode and is_callable below ensure that if we've deleted the parent node,
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// we don't try to call removeChild on a nonexistent child node
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if ($nodesWithStyleDisplayNone->length > 0) {
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/** @var $node \DOMNode */
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foreach ($nodesWithStyleDisplayNone as $node) {
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if ($node->parentNode && is_callable(array($node->parentNode,'removeChild'))) {
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$node->parentNode->removeChild($node);
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}
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}
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}
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if ($this->preserveEncoding) {
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return mb_convert_encoding($xmlDocument->saveHTML(), self::ENCODING, 'HTML-ENTITIES');
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} else {
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return $xmlDocument->saveHTML();
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}
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}
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/**
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* Creates a DOMDocument instance with the current HTML.
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*
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* @return \DOMDocument
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*/
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private function createXmlDocument() {
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$xmlDocument = new DOMDocument;
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$xmlDocument->encoding = self::ENCODING;
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$xmlDocument->strictErrorChecking = FALSE;
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$xmlDocument->formatOutput = TRUE;
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$libxmlState = libxml_use_internal_errors(TRUE);
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$xmlDocument->loadHTML($this->getUnifiedHtml());
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libxml_clear_errors();
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libxml_use_internal_errors($libxmlState);
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$xmlDocument->normalizeDocument();
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return $xmlDocument;
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}
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/**
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* Returns the HTML with the non-ASCII characters converts into HTML entities and the unprocessable HTML tags removed.
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*
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* @return string the unified HTML
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*
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* @throws \BadMethodCallException
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*/
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private function getUnifiedHtml() {
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if (!empty($this->unprocessableHtmlTags)) {
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$unprocessableHtmlTags = implode('|', $this->unprocessableHtmlTags);
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$bodyWithoutUnprocessableTags = preg_replace('/<\\/?(' . $unprocessableHtmlTags . ')[^>]*>/i', '', $this->html);
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} else {
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$bodyWithoutUnprocessableTags = $this->html;
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}
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return mb_convert_encoding($bodyWithoutUnprocessableTags, 'HTML-ENTITIES', self::ENCODING);
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}
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/**
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* @param array $a
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* @param array $b
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*
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* @return integer
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*/
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private function sortBySelectorPrecedence(array $a, array $b) {
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$precedenceA = $this->getCssSelectorPrecedence($a['selector']);
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$precedenceB = $this->getCssSelectorPrecedence($b['selector']);
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// We want these sorted in ascending order so selectors with lesser precedence get processed first and
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// selectors with greater precedence get sorted last.
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// The parenthesis around the -1 are necessary to avoid a PHP_CodeSniffer warning about missing spaces around
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// arithmetic operators.
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// @see http://forge.typo3.org/issues/55605
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$precedenceForEquals = ($a['line'] < $b['line'] ? (-1) : 1);
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$precedenceForNotEquals = ($precedenceA < $precedenceB ? (-1) : 1);
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return ($precedenceA === $precedenceB) ? $precedenceForEquals : $precedenceForNotEquals;
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}
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/**
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* @param string $selector
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*
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* @return integer
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*/
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private function getCssSelectorPrecedence($selector) {
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$selectorKey = md5($selector);
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if (!isset($this->caches[self::CACHE_KEY_SELECTOR][$selectorKey])) {
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$precedence = 0;
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$value = 100;
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// ids: worth 100, classes: worth 10, elements: worth 1
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$search = array('\\#','\\.','');
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foreach ($search as $s) {
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if (trim($selector == '')) {
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break;
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}
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$number = 0;
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$selector = preg_replace('/' . $s . '\\w+/', '', $selector, -1, $number);
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$precedence += ($value * $number);
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$value /= 10;
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}
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$this->caches[self::CACHE_KEY_SELECTOR][$selectorKey] = $precedence;
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}
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return $this->caches[self::CACHE_KEY_SELECTOR][$selectorKey];
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}
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/**
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* Right now, we support all CSS 1 selectors and most CSS2/3 selectors.
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*
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* @see http://plasmasturm.org/log/444/
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*
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* @param string $cssSelector
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*
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* @return string
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*/
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private function translateCssToXpath($cssSelector) {
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$cssSelector = trim($cssSelector);
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$xpathKey = md5($cssSelector);
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if (!isset($this->caches[self::CACHE_KEY_XPATH][$xpathKey])) {
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// returns an Xpath selector
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$search = array(
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// Matches any element that is a child of parent.
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'/\\s+>\\s+/',
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// Matches any element that is an adjacent sibling.
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'/\\s+\\+\\s+/',
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// Matches any element that is a descendant of an parent element element.
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'/\\s+/',
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// first-child pseudo-selector
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'/([^\\/]+):first-child/i',
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// last-child pseudo-selector
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'/([^\\/]+):last-child/i',
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// Matches element with attribute
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'/(\\w)\\[(\\w+)\\]/',
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// Matches element with EXACT attribute
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'/(\\w)\\[(\\w+)\\=[\'"]?(\\w+)[\'"]?\\]/',
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);
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$replace = array(
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'/',
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'/following-sibling::*[1]/self::',
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'//',
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'*[1]/self::\\1',
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'*[last()]/self::\\1',
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'\\1[@\\2]',
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'\\1[@\\2="\\3"]',
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);
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$cssSelector = '//' . preg_replace($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 array $match
|
|
*
|
|
* @return string
|
|
*/
|
|
private function matchIdAttributes(array $match) {
|
|
return (strlen($match[1]) ? $match[1] : '*') . '[@id="' . $match[2] . '"]';
|
|
}
|
|
|
|
/**
|
|
* @param array $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 array $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 array $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 array $match
|
|
*
|
|
* @return array
|
|
*/
|
|
private function parseNth(array $match) {
|
|
if (in_array(strtolower($match[2]), array('even','odd'))) {
|
|
$index = strtolower($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 = intval(str_replace(' ', '', $match[2]));
|
|
return array(self::INDEX => $index);
|
|
} else {
|
|
if (isset($match[3])) {
|
|
$multipleTerm = str_replace($match[3], '', $match[2]);
|
|
$index = intval(str_replace(' ', '', $match[3]));
|
|
} else {
|
|
$multipleTerm = $match[2];
|
|
$index = 0;
|
|
}
|
|
|
|
$multiplier = str_ireplace('n', '', $multipleTerm);
|
|
|
|
if (!strlen($multiplier)) {
|
|
$multiplier = 1;
|
|
} elseif ($multiplier == 0) {
|
|
return array(self::INDEX => $index);
|
|
} else {
|
|
$multiplier = intval($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 $cssDeclarationBlock the CSS declaration block without the curly braces, may be empty
|
|
*
|
|
* @return array the CSS declarations with the property names as array keys and the property values as array values
|
|
*/
|
|
private function parseCssDeclarationBlock($cssDeclarationBlock) {
|
|
$properties = array();
|
|
|
|
$declarations = explode(';', $cssDeclarationBlock);
|
|
foreach ($declarations as $declaration) {
|
|
$matches = array();
|
|
if (!preg_match('/ *([a-z\-]+) *: *([^;]+) */', $declaration, $matches)) {
|
|
continue;
|
|
}
|
|
$propertyName = $matches[1];
|
|
$propertyValue = $matches[2];
|
|
$properties[$propertyName] = $propertyValue;
|
|
}
|
|
|
|
return $properties;
|
|
}
|
|
}
|