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Edit File: class-emogrifier.php

<?php
/**
 * This class provides functions for converting CSS styles into inline style attributes in your HTML code.
 *
 * For more information, please see the README.md file.
 *
 * @author Cameron Brooks
 * @author Jaime Prado
 * @author Roman O�ana <ozana@omdesign.cz>
 */
if(!class_exists('Emogrifier')) {
	class Emogrifier {
		/**
		 * @var string
		 */
		const ENCODING = 'UTF-8';

/**
		 * @var integer
		 */
		const CACHE_KEY_CSS = 0;

/**
		 * @var integer
		 */
		const CACHE_KEY_SELECTOR = 1;

/**
		 * @var integer
		 */
		const CACHE_KEY_XPATH = 2;

/**
		 * @var integer
		 */
		const CACHE_KEY_CSS_DECLARATION_BLOCK = 3;

/**
		 * for calculating nth-of-type and nth-child selectors
		 *
		 * @var integer
		 */
		const INDEX = 0;

/**
		 * for calculating nth-of-type and nth-child selectors
		 *
		 * @var integer
		 */
		const MULTIPLIER = 1;

/**
		 * @var string
		 */
		const ID_ATTRIBUTE_MATCHER = '/(\\w+)?\\#([\\w\\-]+)/';

/**
		 * @var string
		 */
		const CLASS_ATTRIBUTE_MATCHER = '/(\\w+|[\\*\\]])?((\\.[\\w\\-]+)+)/';

/**
		 * @var string
		 */
		private $html = '';

/**
		 * @var string
		 */
		private $css = '';

/**
		 * @var array<string>
		 */
		private $unprocessableHtmlTags = array( 'wbr' );

/**
		 * @var array<array>
		 */
		private $caches = array(
			self::CACHE_KEY_CSS                   => array(),
			self::CACHE_KEY_SELECTOR              => array(),
			self::CACHE_KEY_XPATH                 => array(),
			self::CACHE_KEY_CSS_DECLARATION_BLOCK => array(),
		);

/**
		 * the visited nodes with the XPath paths as array keys
		 *
		 * @var array<\DOMNode>
		 */
		private $visitedNodes = array();

/**
		 * the styles to apply to the nodes with the XPath paths as array keys for the outer array and the attribute names/values
		 * as key/value pairs for the inner array
		 *
		 * @var array<array><string>
		 */
		private $styleAttributesForNodes = array();

/**
		 * This attribute applies to the case where you want to preserve your original text encoding.
		 *
		 * By default, emogrifier translates your text into HTML entities for two reasons:
		 *
		 * 1. Because of client incompatibilities, it is better practice to send out HTML entities rather than unicode over email.
		 *
		 * 2. It translates any illegal XML characters that DOMDocument cannot work with.
		 *
		 * If you would like to preserve your original encoding, set this attribute to TRUE.
		 *
		 * @var boolean
		 */
		public $preserveEncoding = false;

public static $_media = '';

/**
		 * The constructor.
		 *
		 * @param string $html the HTML to emogrify, must be UTF-8-encoded
		 * @param string $css  the CSS to merge, must be UTF-8-encoded
		 */
		public function __construct( $html = '', $css = '' ) {
			$this->setHtml( $html );
			$this->setCss( $css );
		}

/**
		 * The destructor.
		 */
		public function __destruct() {
			$this->purgeVisitedNodes();
		}

/**
		 * Sets the HTML to emogrify.
		 *
		 * @param string $html the HTML to emogrify, must be UTF-8-encoded
		 */
		public function setHtml( $html = '' ) {
			$this->html = $html;
		}

/**
		 * Sets the CSS to merge with the HTML.
		 *
		 * @param string $css the CSS to merge, must be UTF-8-encoded
		 */
		public function setCss( $css = '' ) {
			$this->css = $css;
		}

/**
		 * Clears all caches.
		 */
		private function clearAllCaches() {
			$this->clearCache( self::CACHE_KEY_CSS );
			$this->clearCache( self::CACHE_KEY_SELECTOR );
			$this->clearCache( self::CACHE_KEY_XPATH );
			$this->clearCache( self::CACHE_KEY_CSS_DECLARATION_BLOCK );
		}

/**
		 * Clears a single cache by key.
		 *
		 * @param integer $key the cache key, must be CACHE_KEY_CSS, CACHE_KEY_SELECTOR, CACHE_KEY_XPATH or CACHE_KEY_CSS_DECLARATION_BLOCK
		 *
		 * @throws InvalidArgumentException
		 */
		private function clearCache( $key ) {
			$allowedCacheKeys = array( self::CACHE_KEY_CSS, self::CACHE_KEY_SELECTOR, self::CACHE_KEY_XPATH, self::CACHE_KEY_CSS_DECLARATION_BLOCK );
			if ( !in_array( $key, $allowedCacheKeys, true ) ) {
				throw new InvalidArgumentException( 'Invalid cache key: ' . $key, 1391822035 );
			}

$this->caches[$key] = array();
		}

/**
		 * Purges the visited nodes.
		 */
		private function purgeVisitedNodes() {
			$this->visitedNodes            = array();
			$this->styleAttributesForNodes = array();
		}

/**
		 * Marks a tag for removal.
		 *
		 * There are some HTML tags that DOMDocument cannot process, and it will throw an error if it encounters them.
		 * In particular, DOMDocument will complain if you try to use HTML5 tags in an XHTML document.
		 *
		 * Note: The tags will not be removed if they have any content.
		 *
		 * @param string $tagName the tag name, e.g., "p"
		 */
		public function addUnprocessableHtmlTag( $tagName ) {
			$this->unprocessableHtmlTags[] = $tagName;
		}

/**
		 * Drops a tag from the removal list.
		 *
		 * @param string $tagName the tag name, e.g., "p"
		 */
		public function removeUnprocessableHtmlTag( $tagName ) {
			$key = array_search( $tagName, $this->unprocessableHtmlTags, true );
			if ( $key !== false ) {
				unset( $this->unprocessableHtmlTags[$key] );
			}
		}

/**
		 * Applies the CSS you submit to the HTML you submit.
		 *
		 * This method places the CSS inline.
		 *
		 * @return string
		 *
		 * @throws BadMethodCallException
		 */
		public function emogrify() {
			if ( $this->html === '' ) {
				throw new BadMethodCallException( 'Please set some HTML first before calling emogrify.', 1390393096 );
			}

$xmlDocument = $this->createXmlDocument();
			$xpath       = new DOMXPath( $xmlDocument );
			$this->clearAllCaches();

// before be begin processing the CSS file, parse the document and normalize all existing CSS attributes (changes 'DISPLAY: none' to 'display: none');
			// we wouldn't have to do this if DOMXPath supported XPath 2.0.
			// also store a reference of nodes with existing inline styles so we don't overwrite them
			$this->purgeVisitedNodes();

$nodesWithStyleAttributes = $xpath->query( '//*[@style]' );
			if ( $nodesWithStyleAttributes !== false ) {
				/** @var $nodeWithStyleAttribute DOMNode */
				foreach ( $nodesWithStyleAttributes as $node ) {
					$normalizedOriginalStyle = preg_replace_callback( '/[A-z\\-]+(?=\\:)/S', array( $this, 'strtolower' ), $node->getAttribute( 'style' ) );

// in order to not overwrite existing style attributes in the HTML, we have to save the original HTML styles
					$nodePath = $node->getNodePath();
					if ( !isset( $this->styleAttributesForNodes[$nodePath] ) ) {
						$this->styleAttributesForNodes[$nodePath] = $this->parseCssDeclarationBlock( $normalizedOriginalStyle );
						$this->visitedNodes[$nodePath]            = $node;
					}

$node->setAttribute( 'style', $normalizedOriginalStyle );
				}
			}

// grab any existing style blocks from the html and append them to the existing CSS
			// (these blocks should be appended so as to have precedence over conflicting styles in the existing CSS)
			$allCss = $this->css;

$allCss .= $this->getCssFromAllStyleNodes( $xpath );

$cssParts     = $this->splitCssAndMediaQuery( $allCss );
			self::$_media = ''; // reset

$cssKey = md5( $cssParts['css'] );
			if ( !isset( $this->caches[self::CACHE_KEY_CSS][$cssKey] ) ) {
				// process the CSS file for selectors and definitions
				preg_match_all( '/(?:^|[\\s^{}]*)([^{]+){([^}]*)}/mis', $cssParts['css'], $matches, PREG_SET_ORDER );

$allSelectors = array();
				foreach ( $matches as $key => $selectorString ) {
					// if there is a blank definition, skip
					if ( !strlen( trim( $selectorString[2] ) ) ) {
						continue;
					}

// else split by commas and duplicate attributes so we can sort by selector precedence
					$selectors = explode( ',', $selectorString[1] );
					foreach ( $selectors as $selector ) {
						// don't process pseudo-elements and behavioral (dynamic) pseudo-classes; ONLY allow structural pseudo-classes
						if ( strpos( $selector, ':' ) !== false && !preg_match( '/:\\S+\\-(child|type)\\(/i', $selector ) ) {
							continue;
						}

$allSelectors[] = array( 'selector'   => trim( $selector ),
												 'attributes' => trim( $selectorString[2] ),
							// keep track of where it appears in the file, since order is important
												 'line'       => $key,
						);
					}
				}

// now sort the selectors by precedence
				usort( $allSelectors, array( $this, 'sortBySelectorPrecedence' ) );

$this->caches[self::CACHE_KEY_CSS][$cssKey] = $allSelectors;
			}

foreach ( $this->caches[self::CACHE_KEY_CSS][$cssKey] as $value ) {
				// query the body for the xpath selector
				$nodesMatchingCssSelectors = $xpath->query( $this->translateCssToXpath( $value['selector'] ) );

/** @var $node \DOMNode */
				foreach ( $nodesMatchingCssSelectors as $node ) {
					// if it has a style attribute, get it, process it, and append (overwrite) new stuff
					if ( $node->hasAttribute( 'style' ) ) {
						// break it up into an associative array
						$oldStyleDeclarations = $this->parseCssDeclarationBlock( $node->getAttribute( 'style' ) );
					} else {
						$oldStyleDeclarations = array();
					}
					$newStyleDeclarations = $this->parseCssDeclarationBlock( $value['attributes'] );
					$node->setAttribute( 'style', $this->generateStyleStringFromDeclarationsArrays( $oldStyleDeclarations, $newStyleDeclarations ) );
				}
			}

// now iterate through the nodes that contained inline styles in the original HTML
			foreach ( $this->styleAttributesForNodes as $nodePath => $styleAttributesForNode ) {
				$node                   = $this->visitedNodes[$nodePath];
				$currentStyleAttributes = $this->parseCssDeclarationBlock( $node->getAttribute( 'style' ) );
				$node->setAttribute( 'style', $this->generateStyleStringFromDeclarationsArrays( $currentStyleAttributes, $styleAttributesForNode ) );
			}

// This removes styles from your email that contain display:none.
			// We need to look for display:none, but we need to do a case-insensitive search. Since DOMDocument only supports XPath 1.0,
			// lower-case() isn't available to us. We've thus far only set attributes to lowercase, not attribute values. Consequently, we need
			// to translate() the letters that would be in 'NONE' ("NOE") to lowercase.
			$nodesWithStyleDisplayNone = $xpath->query( '//*[contains(translate(translate(@style," ",""),"NOE","noe"),"display:none")]' );
			// The checks on parentNode and is_callable below ensure that if we've deleted the parent node,
			// we don't try to call removeChild on a nonexistent child node
			if ( $nodesWithStyleDisplayNone->length > 0 ) {
				/** @var $node \DOMNode */
				foreach ( $nodesWithStyleDisplayNone as $node ) {
					if ( $node->parentNode && is_callable( array( $node->parentNode, 'removeChild' ) ) ) {
						$node->parentNode->removeChild( $node );
					}
				}
			}

$this->copyCssWithMediaToStyleNode( $cssParts, $xmlDocument );

if ( $this->preserveEncoding ) {
				if ( function_exists( 'mb_convert_encoding' ) ) {
					return mb_convert_encoding( $xmlDocument->saveHTML(), self::ENCODING, 'HTML-ENTITIES' );
				} else {
					return htmlspecialchars_decode( utf8_encode( html_entity_decode( $xmlDocument->saveHTML(), ENT_COMPAT, self::ENCODING ) ) );
				}
			} else {
				return $xmlDocument->saveHTML();
			}
		}

public function strtolower( array $m ) {
			return strtolower( $m[0] );
		}

/**
		 * 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 array $oldStyles
		 * @param array $newStyles
		 *
		 * @return string
		 */
		private function generateStyleStringFromDeclarationsArrays( array $oldStyles, array $newStyles ) {
			$combinedStyles = array_merge( $oldStyles, $newStyles );
			$style          = '';
			foreach ( $combinedStyles as $attributeName => $attributeValue ) {
				$style .= ( strtolower( trim( $attributeName ) ) . ': ' . trim( $attributeValue ) . '; ' );
			}
			return trim( $style );
		}

/**
		 * Copies the media part from CSS array parts to $xmlDocument.
		 *
		 * @param array       $cssParts
		 * @param DOMDocument $xmlDocument
		 */
		public function copyCssWithMediaToStyleNode( array $cssParts, DOMDocument $xmlDocument ) {
			if ( isset( $cssParts['media'] ) && $cssParts['media'] !== '' ) {
				$this->addStyleElementToDocument( $xmlDocument, $cssParts['media'] );
			}
		}

/**
		 * Returns CSS content.
		 *
		 * @param DOMXPath $xpath
		 *
		 * @return string
		 */
		private function getCssFromAllStyleNodes( DOMXPath $xpath ) {
			$styleNodes = $xpath->query( '//style' );

if ( $styleNodes === false ) {
				return '';
			}

$css = '';
			/** @var $styleNode DOMNode */
			foreach ( $styleNodes as $styleNode ) {
				$css .= "\n\n" . $styleNode->nodeValue;
				$styleNode->parentNode->removeChild( $styleNode );
			}

return $css;
		}

/**
		 * Adds a style element with $css to $document.
		 *
		 * @param DOMDocument $document
		 * @param string      $css
		 */
		private 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 array
		 */
		private function splitCssAndMediaQuery( $css ) {
			$css = preg_replace_callback( '#@media\\s+(?:only\\s)?(?:[\\s{\(]|screen|all)\\s?[^{]+{.*}\\s*}\\s*#misU', array( $this, '_media_concat' ), $css );

// filter the CSS
			$search = array(
				// get rid of css comment code
				'/\\/\\*.*\\*\\//sU',
				// strip out any import directives
				'/^\\s*@import\\s[^;]+;/misU',
				// strip remains media enclosures
				'/^\\s*@media\\s[^{]+{(.*)}\\s*}\\s/misU',
			);

$replace = array(
				'',
				'',
				'',
			);

// clean CSS before output
			$css = preg_replace( $search, $replace, $css );

return array( 'css' => $css, 'media' => self::$_media );
		}

private function _media_concat( $matches ) {
			self::$_media .= $matches[0];
		}

/**
		 * Creates a DOMDocument instance with the current HTML.
		 *
		 * @return DOMDocument
		 */
		private function createXmlDocument() {
			$xmlDocument                      = new DOMDocument;
			$xmlDocument->encoding            = self::ENCODING;
			$xmlDocument->strictErrorChecking = false;
			$xmlDocument->formatOutput        = true;
			$libXmlState                      = libxml_use_internal_errors( true );
			$xmlDocument->loadHTML( $this->getUnifiedHtml() );
			libxml_clear_errors();
			libxml_use_internal_errors( $libXmlState );
			$xmlDocument->normalizeDocument();

return $xmlDocument;
		}

/**
		 * Returns the HTML with the non-ASCII characters converts into HTML entities and the unprocessable HTML tags removed.
		 *
		 * @return string the unified HTML
		 *
		 * @throws BadMethodCallException
		 */
		private function getUnifiedHtml() {
			if ( !empty( $this->unprocessableHtmlTags ) ) {
				$unprocessableHtmlTags        = implode( '|', $this->unprocessableHtmlTags );
				$bodyWithoutUnprocessableTags = preg_replace( '/<\\/?(' . $unprocessableHtmlTags . ')[^>]*>/i', '', $this->html );
			} else {
				$bodyWithoutUnprocessableTags = $this->html;
			}

if ( function_exists( 'mb_convert_encoding' ) ) {
				return mb_convert_encoding( $bodyWithoutUnprocessableTags, 'HTML-ENTITIES', self::ENCODING );
			} else {
				return htmlspecialchars_decode( utf8_decode( htmlentities( $bodyWithoutUnprocessableTags, ENT_COMPAT, self::ENCODING, false ) ) );
			}
		}

/**
		 * @param array $a
		 * @param array $b
		 *
		 * @return integer
		 */
		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.
			// The parenthesis around the -1 are necessary to avoid a PHP_CodeSniffer warning about missing spaces around
			// arithmetic operators.
			// @see http://forge.typo3.org/issues/55605
			$precedenceForEquals    = ( $a['line'] < $b['line'] ? ( - 1 ) : 1 );
			$precedenceForNotEquals = ( $precedenceA < $precedenceB ? ( - 1 ) : 1 );
			return ( $precedenceA === $precedenceB ) ? $precedenceForEquals : $precedenceForNotEquals;
		}

/**
		 * @param string $selector
		 *
		 * @return integer
		 */
		private function getCssSelectorPrecedence( $selector ) {
			$selectorKey = md5( $selector );
			if ( !isset( $this->caches[self::CACHE_KEY_SELECTOR][$selectorKey] ) ) {
				$precedence = 0;
				$value      = 100;
				// ids: worth 100, classes: worth 10, elements: worth 1
				$search = array( '\\#', '\\.', '' );

foreach ( $search as $s ) {
					if ( trim( $selector == '' ) ) {
						break;
					}
					$number   = 0;
					$selector = preg_replace( '/' . $s . '\\w+/', '', $selector, - 1, $number );
					$precedence += ( $value * $number );
					$value /= 10;
				}
				$this->caches[self::CACHE_KEY_SELECTOR][$selectorKey] = $precedence;
			}

return $this->caches[self::CACHE_KEY_SELECTOR][$selectorKey];
		}

/**
		 * Right now, we support all CSS 1 selectors and most CSS2/3 selectors.
		 *
		 * @see http://plasmasturm.org/log/444/
		 *
		 * @param string $paramCssSelector
		 *
		 * @return string
		 */
		private function translateCssToXpath( $paramCssSelector ) {
			$cssSelector = ' ' . $paramCssSelector . ' ';
			$cssSelector = preg_replace_callback( '/\s+\w+\s+/', array( $this, 'strtolower' ), $cssSelector );
			$cssSelector = trim( $cssSelector );
			$xpathKey    = md5( $cssSelector );
			if ( !isset( $this->caches[self::CACHE_KEY_XPATH][$xpathKey] ) ) {
				// returns an Xpath selector
				$search  = array(
					// Matches any element that is a child of parent.
					'/\\s+>\\s+/',
					// Matches any element that is an adjacent sibling.
					'/\\s+\\+\\s+/',
					// Matches any element that is a descendant of an parent element element.
					'/\\s+/',
					// first-child pseudo-selector
					'/([^\\/]+):first-child/i',
					// last-child pseudo-selector
					'/([^\\/]+):last-child/i',
					// Matches attribute only selector
					'/^\\[(\\w+)\\]/',
					// Matches element with attribute
					'/(\\w)\\[(\\w+)\\]/',
					// Matches element with EXACT attribute
					'/(\\w)\\[(\\w+)\\=[\'"]?(\\w+)[\'"]?\\]/',
				);
				$replace = array(
					'/',
					'/following-sibling::*[1]/self::',
					'//',
					'*[1]/self::\\1',
					'*[last()]/self::\\1',
					'*[@\\1]',
					'\\1[@\\2]',
					'\\1[@\\2="\\3"]',
				);

$cssSelector = '//' . preg_replace( $search, $replace, $cssSelector );

$cssSelector = preg_replace_callback( self::ID_ATTRIBUTE_MATCHER, array( $this, 'matchIdAttributes' ), $cssSelector );
				$cssSelector = preg_replace_callback( self::CLASS_ATTRIBUTE_MATCHER, array( $this, 'matchClassAttributes' ), $cssSelector );

// Advanced selectors are going to require a bit more advanced emogrification.
				// When we required PHP 5.3, we could do this with closures.
				$cssSelector = preg_replace_callback(
					'/([^\\/]+):nth-child\$\s*(odd|even|[+\-]?\\d|[+\\-]?\\d?n(\\s*[+\\-]\\s*\\d)?)\\s*\$/i',
					array( $this, 'translateNthChild' ), $cssSelector
				);
				$cssSelector = preg_replace_callback(
					'/([^\\/]+):nth-of-type\$\s*(odd|even|[+\-]?\\d|[+\\-]?\\d?n(\\s*[+\\-]\\s*\\d)?)\\s*\$/i',
					array( $this, 'translateNthOfType' ), $cssSelector
				);

$this->caches[self::CACHE_KEY_SELECTOR][$xpathKey] = $cssSelector;
			}
			return $this->caches[self::CACHE_KEY_SELECTOR][$xpathKey];
		}

/**
		 * @param 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 ) {
			if ( isset( $this->caches[self::CACHE_KEY_CSS_DECLARATION_BLOCK][$cssDeclarationBlock] ) ) {
				return $this->caches[self::CACHE_KEY_CSS_DECLARATION_BLOCK][$cssDeclarationBlock];
			}

$properties   = array();
			$declarations = explode( ';', $cssDeclarationBlock );
			foreach ( $declarations as $declaration ) {
				$matches = array();
				if ( !preg_match( '/ *([A-Za-z\\-]+) *: *([^;]+) */', $declaration, $matches ) ) {
					continue;
				}
				$propertyName              = strtolower( $matches[1] );
				$propertyValue             = $matches[2];
				$properties[$propertyName] = $propertyValue;
			}
			$this->caches[self::CACHE_KEY_CSS_DECLARATION_BLOCK][$cssDeclarationBlock] = $properties;

return $properties;
		}
	}
}