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<?php
namespace Bitrix\Main\Web\DOM;
class CssParser
{
public static function parseDocument(Document $document, $sort = false)
{
$css = static::findDocumentCss($document);
return static::parse($css, $sort);
}
public static function parse($css, $sort = false)
{
$result = static::parseCss($css);
if($sort)
{
return static::sortSelectors($result);
}
else
{
return $result;
}
}
public static function parseCss($css)
{
$result = array();
// remove comments
$css = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!','', $css);
// remove keyframes rules
$css = preg_replace('/@[-|keyframes].*?\{.*?\}[ \r\n]*?/s', '', $css);
$css = trim($css);
foreach(explode("}", $css) as $declarationBlock)
{
$declarationBlock = trim($declarationBlock);
if(!$declarationBlock)
{
continue;
}
$declarationBlockExploded = explode("{", $declarationBlock);
$selectorList = $declarationBlockExploded[0];
$declaration = $declarationBlockExploded[1];
$declaration = trim(trim($declaration), ";");
foreach(explode(',', $selectorList) as $selector)
{
$selector = trim($selector);
$result[] = array(
'SELECTOR' => $selector,
'STYLE' => static::getDeclarationArray($declaration),
);
}
}
return $result;
}
/**
* @param Document $document
* @return string
*/
public static function findDocumentCss(Document $document)
{
if(!$document->getHead())
{
return '';
}
if(!$document->getHead()->hasChildNodes())
{
return '';
}
$cssList = array();
foreach($document->getHead()->getChildNodes() as $child)
{
/** @var $child Element */
if($child->getNodeName() === "STYLE" && $child->getAttribute('media') !== 'print')
{
$cssList[] = $child->getTextContent();
//$child->getParentNode()->removeChild($child);
}
}
return implode("\n", $cssList);
}
public static function getDeclarationArray($declarationBlock, $singleStyle = true)
{
$styleList = array();
$declarationBlock = trim($declarationBlock);
if($declarationBlock)
{
// fix image urls in data:URL format with base64 encoding
$declarationBlock = str_replace(';base64', '__base64', $declarationBlock);
foreach(explode(";", $declarationBlock) as $declaration)
{
$declaration = str_replace('__base64', ';base64', $declaration);
$declaration = trim($declaration);
if(!$declaration)
{
continue;
}
// check declaration
if (!preg_match('#^([-a-z0-9\*]+):(.*)$#i', $declaration, $matches))
{
continue;
}
if(!isset($matches[0], $matches[1], $matches[2]))
{
continue;
}
$matches[1] = trim($matches[1]);
if ($singleStyle)
{
$styleList[$matches[1]] = trim($matches[2]);
}
else
{
if (!isset($styleList[$matches[1]]))
{
$styleList[$matches[1]] = [];
}
$styleList[$matches[1]][] = trim($matches[2]);
}
}
}
return $styleList;
}
public static function getDeclarationString($declarationList)
{
$result = '';
foreach($declarationList as $property => $value)
{
if (is_array($value))
{
foreach ($value as $valueChunk)
{
$result .= trim($property) . ': ' . trim($valueChunk) . ';';
}
}
else
{
$result .= trim($property) . ': ' . trim($value) . ';';
}
}
return $result;
}
public static function sortSelectors($styleList)
{
foreach($styleList as $k => $v)
{
$styleList[$k]['SORT'] = static::getSelectorSort($v['SELECTOR']);
$styleList[$k]['SORT'][] = $k;
}
usort($styleList, function ($first, $second)
{
$a = $first['SORT'];
$b = $second['SORT'];
for($i = 0; $i < 4; $i++)
{
if($a[$i] !== $b[$i])
{
return $a[$i] < $b[$i] ? -1 : 1;
}
}
return -1; // last class have more priority
});
foreach($styleList as $k => $v)
{
unset($styleList[$k]['SORT']);
}
return array_reverse($styleList);
}
public static function getSelectorSort($selector)
{
return array(
preg_match_all('/#\w/i', $selector, $result),
preg_match_all('/\.\w/i', $selector, $result),
preg_match_all('/^\w|\ \w|\(\w|\:[^not]/i', $selector, $result)
);
}
}