css parser

function jaw_css_to_array($css) {
    if (empty($css)) return array();
    $css_array = array();
    $css = preg_replace('#/\*.*\*/#U', '', str_replace(array("\n","\r"), array('',''), $css));
    preg_match_all("/([^{}]*)\{(([^{}]*|(?R))*)\}/",$css,$matches);
    foreach ($matches[2] as $key => $rules) {
        $rules = trim($rules,"; \t\n\r\0\x0B");
        if (strpos($rules,'{') !== false) {
            $css_array[trim($matches[1][$key])] = jaw_css_to_array($rules);
        } else {
            $selectors = explode(',',$matches[1][$key]);
            $rules = preg_replace_callback('/\([^\)]*\)/', function ($matches) { return str_replace(';', '[ENCLOSED_DELIMITER]', $matches[0]); }, $rules);
            $rules = explode(';',$rules);
            $rules_array = array();
            foreach ($rules as $rule) {
                if (!empty($rule)) {
                    $rule = explode(':', $rule, 2);
                    $rules_array[] = strtolower(trim($rule[0])) . ': ' . str_replace('[ENCLOSED_DELIMITER]',';', trim($rule[1]));
                }
            }
            foreach ($selectors as $selector) {
                $selector = trim($selector);
                $selector = preg_replace_callback('/(\:)([a-z0-9\-]+)(\(|>|#|\.|\:|\s|$)/i', function ($matches) { return strtolower($matches[0]); }, $selector);
                $selector = preg_replace_callback('/(^|\s|>)([a-z0-9\s>]+)(>|#|\.|\:|\s|$)/i', function ($matches) { return strtoupper($matches[0]); }, $selector);
                $css_array[$selector] = (is_array($css_array[$selector]) ? array_merge($css_array[$selector],$rules_array) : $rules_array);
            }
        }
    }
    return $css_array;
}

function jaw_css_array_depth($Array,$DepthCount=-1,$DepthArray=array()) {
  $DepthCount++;
  if (is_array($Array))
    foreach ($Array as $Key => $Value)
      $DepthArray[]=jaw_css_array_depth($Value,$DepthCount);
  else
    return $DepthCount;
  foreach($DepthArray as $Value)
    $Depth=$Value>$Depth?$Value:$Depth;
  return $Depth;
}


function jaw_css_group_selectors($css_array) {
    if (empty($css_array)) return array();
    $css_agrupado = array();
    $css_checked = array();
    foreach ($css_array as $selector => $rules) {
        if (jaw_css_array_depth($rules) > 1) {
            $css_array[$selector] = jaw_css_group_selectors($css_array[$selector]);
        } else {
            unset($css_same_rules, $maior_quantidade, $mesmas_regras);
            $css_checked[] = $selector;
            foreach ($css_array as $check_selector => $check_rules) {
                if (!in_array($check_selector,$css_checked)) {
                    $intersect = array_intersect($css_array[$selector], $check_rules);
                    $quantidade = sizeof($intersect);
                    $restante = sizeof($check_rules) - $quantidade;
                    $check_mesmas_regras = $intersect;
                    sort($check_mesmas_regras);
                    if (($quantidade > 0 && $quantidade >= $maior_quantidade) || (is_array($mesmas_regras) && $check_mesmas_regras == $mesmas_regras)) {
                        if ($quantidade <= 2 && $restante > 0) continue;
                        if ($check_mesmas_regras != $mesmas_regras) $css_same_rules = array();
                        $maior_quantidade = $quantidade;
                        $mesmas_regras = $intersect;
                        sort($mesmas_regras);
                        if (!@in_array($selector, $css_same_rules[$selector]['selectors'])) $css_same_rules[$selector]['selectors'][] = $selector;
                        $css_same_rules[$selector]['selectors'][] = $check_selector;
                        $css_same_rules[$selector]['rules'] = $intersect;
                    }
                }
            }
            if (!empty($css_same_rules)) foreach($css_same_rules as $primeiro_selector => $css_same_rule) {
                foreach($css_same_rule['selectors'] as $selector) {
                    $css_array[$selector] = array_diff($css_array[$selector], $css_same_rule['rules']);
                }
                $css_agrupado = array(implode(', ', $css_same_rule['selectors']) => $css_same_rule['rules']);
                $i=0;
                foreach ($css_array as $selector => $rules) {
                    if ($primeiro_selector == $selector) break;
                    $i++;
                }
                $css_array = array_slice($css_array, 0, $i) + $css_agrupado + array_slice($css_array, $i);
            }
        }
    }
    return array_filter($css_array);
}




function jaw_css_render($css_array,$min=false,$nivel=0) {
    $css = NULL;
    if ($nivel==0) $css_array = jaw_css_group_selectors($css_array);
    foreach ($css_array as $selector => $rules) {
        $rules_str = NULL;
        foreach($rules as $rule => $value) {
            if (jaw_css_array_depth($value) > 0) {
                $rules_str .= jaw_css_render(array($rule => $value),$min,$nivel+1);
            } else {
                $rules_str .= ($min ? '' : str_repeat("\t", $nivel+1)) . $value. ($min ? '; ' : ";\r\n");
            }
        }
        $css .= ($min ? '' : str_repeat("\t", $nivel)) . $selector . ($min ? ' { ' : " {\r\n") . $rules_str . ($min ? '' : str_repeat("\t", $nivel)) . "}\r\n";
    }
    return $css;
}