* @author Roman Ožana
* @author Sander Kruger
* @author Zoli Szabó
*/
class Emogrifier
{
/**
* @var int
*/
const CACHE_KEY_CSS = 0;
/**
* @var int
*/
const CACHE_KEY_SELECTOR = 1;
/**
* @var int
*/
const CACHE_KEY_XPATH = 2;
/**
* @var int
*/
const CACHE_KEY_CSS_DECLARATIONS_BLOCK = 3;
/**
* @var int
*/
const CACHE_KEY_COMBINED_STYLES = 4;
/**
* for calculating nth-of-type and nth-child selectors
*
* @var int
*/
const INDEX = 0;
/**
* for calculating nth-of-type and nth-child selectors
*
* @var int
*/
const MULTIPLIER = 1;
/**
* @var string
*/
const ID_ATTRIBUTE_MATCHER = '/(\\w+)?\\#([\\w\\-]+)/';
/**
* @var string
*/
const CLASS_ATTRIBUTE_MATCHER = '/(\\w+|[\\*\\]])?((\\.[\\w\\-]+)+)/';
/**
* Regular expression component matching a static pseudo class in a selector, without the preceding ":",
* for which the applicable elements can be determined (by converting the selector to an XPath expression).
* (Contains alternation without a group and is intended to be placed within a capturing, non-capturing or lookahead
* group, as appropriate for the usage context.)
*
* @var string
*/
const PSEUDO_CLASS_MATCHER = '(?:first|last|nth)-child|nth-of-type|not\\([[:ascii:]]*\\)';
/**
* @var string
*/
const CONTENT_TYPE_META_TAG = '';
/**
* @var string
*/
const DEFAULT_DOCUMENT_TYPE = '';
/**
* @var string Regular expression part to match tag names that PHP's DOMDocument implementation is not aware are
* self-closing. These are mostly HTML5 elements, but for completeness (obsolete) and
* (deprecated) are also included.
*
* @see https://bugs.php.net/bug.php?id=73175
*/
const PHP_UNRECOGNIZED_VOID_TAGNAME_MATCHER = '(?:command|embed|keygen|source|track|wbr)';
/**
* @var \DOMDocument
*/
protected $domDocument = null;
/**
* @var \DOMXPath
*/
protected $xPath = null;
/**
* @var string
*/
private $css = '';
/**
* @var bool[]
*/
private $excludedSelectors = [];
/**
* @var string[]
*/
private $unprocessableHtmlTags = ['wbr'];
/**
* @var bool[]
*/
private $allowedMediaTypes = ['all' => true, 'screen' => true, 'print' => true];
/**
* @var mixed[]
*/
private $caches = [
self::CACHE_KEY_CSS => [],
self::CACHE_KEY_SELECTOR => [],
self::CACHE_KEY_XPATH => [],
self::CACHE_KEY_CSS_DECLARATIONS_BLOCK => [],
self::CACHE_KEY_COMBINED_STYLES => [],
];
/**
* the visited nodes with the XPath paths as array keys
*
* @var \DOMElement[]
*/
private $visitedNodes = [];
/**
* the styles to apply to the nodes with the XPath paths as array keys for the outer array
* and the attribute names/values as key/value pairs for the inner array
*
* @var string[][]
*/
private $styleAttributesForNodes = [];
/**
* Determines whether the "style" attributes of tags in the the HTML passed to this class should be preserved.
* If set to false, the value of the style attributes will be discarded.
*
* @var bool
*/
private $isInlineStyleAttributesParsingEnabled = true;
/**
* Determines whether the