csscomb::preprocess PHP Method

    function preprocess()
    {
        // 1. экранирование хаков, которые мешают парсить
        if (strpos($this->code['edited'], '"\\"}\\""')) {
            // разбираемся со страшным хаком "\"}\""
            $i = 0;
            $this->code['hacks'] = array();
            while (strpos($this->code['edited'], '"\\"}\\""')) {
                $this->code['hacks'][] = '"\\"}\\""';
                $this->code['edited'] = str_replace('"\\"}\\""', 'hack' . $i++ . '__', $this->code['edited']);
            }
        }
        // 2. expressions
        if (strpos($this->code['edited'], 'expression(')) {
            // разбираемся с expression если они присутствуют
            $i = 0;
            $this->code['expressions'] = array();
            while (strpos($this->code['edited'], 'expression(')) {
                // вылавливаем expression
                preg_match_all('@(.*)expression\\((.*?)\\)@ism', $this->code['edited'], $match, PREG_SET_ORDER);
                $this->code['expressions'][] = $match[0][2];
                // собираем значения expression(...)
                $this->code['edited'] = str_replace('expression(' . $match[0][2] . ')', 'exp' . $i++ . '__', $this->code['edited']);
            }
        }
        // 3. data uri
        if (strpos($this->code['edited'], ';base64,')) {
            $i = 0;
            $this->code['datauri'] = array();
            while (strpos($this->code['edited'], ';base64,')) {
                // вылавливаем data uri
                preg_match_all('@(url\\(["\']?data:.[^\\)]*["\']?\\))@ism', $this->code['edited'], $match, PREG_SET_ORDER);
                $this->code['datauri'][] = $match[0][1];
                // собираем значения
                $this->code['edited'] = str_replace($match[0][1], 'datauri' . $i++ . '__', $this->code['edited']);
            }
        }
        // 4. Interpolated variables
        preg_match_all('@(\\#|\\@){.*?}@ismx', $this->code['edited'], $this->code['interpolations'], PREG_SET_ORDER);
        foreach ($this->code['interpolations'] as $key => $value) {
            $this->code['edited'] = str_replace($value[0], 'interpolation' . $key . '__', $this->code['edited']);
        }
        // X. Temporally remove comments
        // Magic comment
        preg_match_all('@
            (\\s*\\/\\*\\s*csscomb:\\s*false\\s*\\*\\/.*?\\/\\*\\s*csscomb:\\s*true\\s*\\*\\/)
            |
            (\\s*\\/\\/\\s*csscomb:\\s*false[\\n\\r].*?\\/\\/\\s*csscomb:\\s*true[^\\n\\S\\r]*)
            @ismx', $this->code['edited'], $this->code['magicComments'], PREG_SET_ORDER);
        foreach ($this->code['magicComments'] as $key => $value) {
            $this->code['edited'] = str_replace($value[0], "\nmagic: comment" . $key . '__;', $this->code['edited']);
        }
        // Comments
        preg_match_all('@
            ([\\n\\r]\\s*/\\*.*?\\*/)+
            |
            (^\\s*/\\*.*?\\*/)+
            |
            ([\\n\\r]\\s*//[^\\n\\r]*)+
            |
            (^\\s*//[^\\n\\r]*)+
            @ismx', $this->code['edited'], $this->code['comments'], PREG_SET_ORDER);
        foreach ($this->code['comments'] as $key => $value) {
            $this->code['edited'] = str_replace($value[0], 'comment' . $key . '__', $this->code['edited']);
        }
        // Inline comments
        preg_match_all('@
            [^\\S\\n\\r]*/\\*.*?\\*/([^\\n\\S\\r]*/\\*.*?\\*/)*
            |
            (?<!:)[^\\S\\n\\r]*//[^\\n\\r]*
            @ismx', $this->code['edited'], $this->code['inlinecomments'], PREG_SET_ORDER);
        foreach ($this->code['inlinecomments'] as $key => $value) {
            $this->code['edited'] = str_replace($value[0], 'inlinecomment' . $key . '__', $this->code['edited']);
        }
        // 5. Закрываем сложности парсинга {}
        $this->code['edited'] = str_replace('{}', '{ }', $this->code['edited']);
        // 6. Закрываем сложности с отсутствующей последней ; перед }
        $this->code['edited'] = preg_replace('@(.*?[^\\s;\\{\\}\\/\\*_])(\\s*?})@', '$1;$2', $this->code['edited']);
        // Убираем ; у последнего инлайнового комментария
        // Инлайновый комментарий может идти только после фигурной скобки или ;
        $this->code['edited'] = preg_replace('@([;\\{\\}]+\\s*?//.*?);(\\s*?})@', '$1$2', $this->code['edited']);
        // Убираем ; у интерполированных переменных
        $this->code['edited'] = preg_replace('/((#\\{\\$|\\@\\{).*?)[;](\\s*?\\})/', '$1$3', $this->code['edited']);
        // 8. Entities
        if (preg_match_all('@
            \\&
            \\#?
            [\\d\\w]*?[^;]
            \\;
            @ismx', $this->code['edited'], $entities)) {
            $this->code['entities'] = array();
            foreach ($entities[0] as $key => $val) {
                $this->code['entities'][$key] = $val;
                $this->code['edited'] = str_replace($val, 'entity__' . $key, $this->code['edited']);
            }
        }
    }