cssparser.php

<?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;
    }
 
    public static function findDocumentCss(Document $document)
    {
        if(!$document->getHead())
        {
            return '';
        }
 
        if(!$document->getHead()->hasChildNodes())
        {
            return '';
        }
 
        $cssList = array();
        foreach($document->getHead()->getChildNodes() as $child)
        {
            if($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)
        );
    }
}