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@@ -0,0 +1,1020 @@
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+<?php
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+namespace Pelago;
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+
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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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+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(self::CACHE_KEY_CSS => array(), self::CACHE_KEY_SELECTOR => array(), self::CACHE_KEY_XPATH => array(), self::CACHE_KEY_CSS_DECLARATIONS_BLOCK => array(), self::CACHE_KEY_COMBINED_STYLES => array());
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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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+ /**
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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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+ {
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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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+ {
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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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+ {
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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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+ {
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+ $this->css = $css;
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+ }
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+ /**
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+ * Applies $this->css to $this->html and returns the HTML with the CSS
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+ * applied.
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+ *
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+ * This method places the CSS inline.
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+ *
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+ * @return string
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+ *
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+ * @throws \BadMethodCallException
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+ */
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+ public function emogrify()
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+ {
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+ if ($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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+ return $xmlDocument->saveHTML();
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+ }
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+ /**
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+ * Applies $this->css to $this->html and returns only the HTML content
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+ * within the <body> tag.
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+ *
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+ * This method places the CSS inline.
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+ *
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+ * @return string
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+ *
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+ * @throws \BadMethodCallException
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+ */
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+ public function emogrifyBodyContent()
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+ {
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+ if ($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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+ {
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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('style', $this->generateStyleStringFromDeclarationsArrays($oldStyleDeclarations, $newStyleDeclarations));
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+ }
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+ }
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+ if ($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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+ {
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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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+ $cssRules[] = array('selector' => trim($selector), 'declarationsBlock' => $cssDeclaration, 'line' => $key);
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+ }
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+ }
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+ usort($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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+ {
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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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+ {
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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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+ {
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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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+ {
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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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+ {
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+ $allowedCacheKeys = array(self::CACHE_KEY_CSS, self::CACHE_KEY_SELECTOR, self::CACHE_KEY_XPATH, self::CACHE_KEY_CSS_DECLARATIONS_BLOCK, self::CACHE_KEY_COMBINED_STYLES);
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+ if (!in_array($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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+ {
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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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+ {
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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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+ {
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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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|
|
+ *
|
|
|
+ * @param string $mediaName the media type name, e.g., "braille"
|
|
|
+ *
|
|
|
+ * @return void
|
|
|
+ */
|
|
|
+ public function addAllowedMediaType($mediaName)
|
|
|
+ {
|
|
|
+ $this->allowedMediaTypes[$mediaName] = true;
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * Drops a media query type from the allowed list.
|
|
|
+ *
|
|
|
+ * @param string $mediaName the tag name, e.g., "braille"
|
|
|
+ *
|
|
|
+ * @return void
|
|
|
+ */
|
|
|
+ public function removeAllowedMediaType($mediaName)
|
|
|
+ {
|
|
|
+ if (isset($this->allowedMediaTypes[$mediaName])) {
|
|
|
+ unset($this->allowedMediaTypes[$mediaName]);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * Adds a selector to exclude nodes from emogrification.
|
|
|
+ *
|
|
|
+ * Any nodes that match the selector will not have their style altered.
|
|
|
+ *
|
|
|
+ * @param string $selector the selector to exclude, e.g., ".editor"
|
|
|
+ *
|
|
|
+ * @return void
|
|
|
+ */
|
|
|
+ public function addExcludedSelector($selector)
|
|
|
+ {
|
|
|
+ $this->excludedSelectors[$selector] = true;
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * No longer excludes the nodes matching this selector from emogrification.
|
|
|
+ *
|
|
|
+ * @param string $selector the selector to no longer exclude, e.g., ".editor"
|
|
|
+ *
|
|
|
+ * @return void
|
|
|
+ */
|
|
|
+ public function removeExcludedSelector($selector)
|
|
|
+ {
|
|
|
+ if (isset($this->excludedSelectors[$selector])) {
|
|
|
+ unset($this->excludedSelectors[$selector]);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * This removes styles from your email that contain display:none.
|
|
|
+ * We need to look for display:none, but we need to do a case-insensitive search. Since DOMDocument only
|
|
|
+ * supports XPath 1.0, lower-case() isn't available to us. We've thus far only set attributes to lowercase,
|
|
|
+ * not attribute values. Consequently, we need to translate() the letters that would be in 'NONE' ("NOE")
|
|
|
+ * to lowercase.
|
|
|
+ *
|
|
|
+ * @param \DOMXPath $xpath
|
|
|
+ *
|
|
|
+ * @return void
|
|
|
+ */
|
|
|
+ private function removeInvisibleNodes(\DOMXPath $xpath)
|
|
|
+ {
|
|
|
+ $nodesWithStyleDisplayNone = $xpath->query('//*[contains(translate(translate(@style," ",""),"NOE","noe"),"display:none")]');
|
|
|
+ if ($nodesWithStyleDisplayNone->length === 0) {
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ // 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);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * Normalizes the value of the "style" attribute and saves it.
|
|
|
+ *
|
|
|
+ * @param \DOMElement $node
|
|
|
+ *
|
|
|
+ * @return void
|
|
|
+ */
|
|
|
+ private function normalizeStyleAttributes(\DOMElement $node)
|
|
|
+ {
|
|
|
+ $normalizedOriginalStyle = preg_replace_callback('/[A-z\\-]+(?=\\:)/S', function (array $m) {
|
|
|
+ return strtolower($m[0]);
|
|
|
+ }, $node->getAttribute('style'));
|
|
|
+ // in order to not overwrite existing style attributes in the HTML, we
|
|
|
+ // have to save the original HTML styles
|
|
|
+ $nodePath = $node->getNodePath();
|
|
|
+ if (!isset($this->styleAttributesForNodes[$nodePath])) {
|
|
|
+ $this->styleAttributesForNodes[$nodePath] = $this->parseCssDeclarationsBlock($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 .= '
|
|
|
+
|
|
|
+' . $styleNode->nodeValue;
|
|
|
+ $styleNode->parentNode->removeChild($styleNode);
|
|
|
+ }
|
|
|
+ return $css;
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * Adds a style element with $css to $document.
|
|
|
+ *
|
|
|
+ * This method is protected to allow overriding.
|
|
|
+ *
|
|
|
+ * @see https://github.com/jjriv/emogrifier/issues/103
|
|
|
+ *
|
|
|
+ * @param \DOMDocument $document
|
|
|
+ * @param string $css
|
|
|
+ *
|
|
|
+ * @return void
|
|
|
+ */
|
|
|
+ protected function addStyleElementToDocument(\DOMDocument $document, $css)
|
|
|
+ {
|
|
|
+ $styleElement = $document->createElement('style', $css);
|
|
|
+ $styleAttribute = $document->createAttribute('type');
|
|
|
+ $styleAttribute->value = 'text/css';
|
|
|
+ $styleElement->appendChild($styleAttribute);
|
|
|
+ $head = $this->getOrCreateHeadElement($document);
|
|
|
+ $head->appendChild($styleElement);
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * Returns the existing or creates a new head element in $document.
|
|
|
+ *
|
|
|
+ * @param \DOMDocument $document
|
|
|
+ *
|
|
|
+ * @return \DOMNode the head element
|
|
|
+ */
|
|
|
+ private function getOrCreateHeadElement(\DOMDocument $document)
|
|
|
+ {
|
|
|
+ $head = $document->getElementsByTagName('head')->item(0);
|
|
|
+ if ($head === null) {
|
|
|
+ $head = $document->createElement('head');
|
|
|
+ $html = $document->getElementsByTagName('html')->item(0);
|
|
|
+ $html->insertBefore($head, $document->getElementsByTagName('body')->item(0));
|
|
|
+ }
|
|
|
+ return $head;
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * Splits input CSS code to an array where:
|
|
|
+ *
|
|
|
+ * - key "css" will be contains clean CSS code
|
|
|
+ * - key "media" will be contains all valuable media queries
|
|
|
+ *
|
|
|
+ * Example:
|
|
|
+ *
|
|
|
+ * The CSS code
|
|
|
+ *
|
|
|
+ * "@import "file.css"; h1 { color:red; } @media { h1 {}} @media tv { h1 {}}"
|
|
|
+ *
|
|
|
+ * will be parsed into the following array:
|
|
|
+ *
|
|
|
+ * "css" => "h1 { color:red; }"
|
|
|
+ * "media" => "@media { h1 {}}"
|
|
|
+ *
|
|
|
+ * @param string $css
|
|
|
+ *
|
|
|
+ * @return string[]
|
|
|
+ */
|
|
|
+ private function splitCssAndMediaQuery($css)
|
|
|
+ {
|
|
|
+ $cssWithoutComments = preg_replace('/\\/\\*.*\\*\\//sU', '', $css);
|
|
|
+ $mediaTypesExpression = '';
|
|
|
+ if (!empty($this->allowedMediaTypes)) {
|
|
|
+ $mediaTypesExpression = '|' . implode('|', array_keys($this->allowedMediaTypes));
|
|
|
+ }
|
|
|
+ $media = '';
|
|
|
+ $cssForAllowedMediaTypes = preg_replace_callback('#@media\\s+(?:only\\s)?(?:[\\s{\\(]' . $mediaTypesExpression . ')\\s?[^{]+{.*}\\s*}\\s*#misU', function ($matches) use(&$media) {
|
|
|
+ $media .= $matches[0];
|
|
|
+ }, $cssWithoutComments);
|
|
|
+ // filter the CSS
|
|
|
+ $search = array('import directives' => '/^\\s*@import\\s[^;]+;/misU', 'remaining media enclosures' => '/^\\s*@media\\s[^{]+{(.*)}\\s*}\\s/misU');
|
|
|
+ $cleanedCss = preg_replace($search, '', $cssForAllowedMediaTypes);
|
|
|
+ return array('css' => $cleanedCss, 'media' => $media);
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * 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];
|
|
|
+ }
|
|
|
+ /**
|
|
|
+ * 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+/', function (array $matches) {
|
|
|
+ return strtolower($matches[0]);
|
|
|
+ }, $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;
|
|
|
+ }
|
|
|
+}
|
romainq