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<?php

class CSSParser {
  protected static $cssCounter = 0;
  protected static $propCounter = 0;
  protected $cssData;

  function __construct() {
    $this->cssData = array();
  }
 
  public function ParseCSS($css) {
    $index = ++self::$cssCounter;
    $this->cssData[$index] = array('all'=>array(),'screen'=>array(),'print'=>array());
    return $this->ParseCode($index, $css);
  }
 
  public function ParseCSSAppend($index, $css) {
    if(isset($this->cssData[$index])) {
      return $this->ParseCode($index, $css);
    } else {
      return $this->ParseCSS($css);
    }
  }
 
  public function ParseCSSMediaAppend($index, $css, $media) {
    $css = '@'.$media.' {'.PHP_EOL.$css.PHP_EOL.'}'.PHP_EOL;
    if(isset($this->cssData[$index])) {
      return $this->ParseCode($index, $css);
    }
    $index = ++self::$cssCounter;
    $this->cssData[$index] = array('all'=>array(),'screen'=>array(),'print'=>array());
    return $this->ParseCode($index, $css);
  }
 
  protected function ParseCode($index, $css) {
    $currentMedia = 'all';
    $mediaList = array();
    $section = false;
    $css = trim($css);
    if(strlen($css) == 0) {
      return $index;
    }
    $css = preg_replace('/\/\*.*\*\//Us', '', $css);
    while(preg_match('/^\s*(\@(media|import|local)([^\{\}]+)(\{)|([^\{\}]+)(\{)|([^\{\}]*)(\}))/Usi', $css, $match)) {
      if(isset($match[8]) && ($match[8] == '}')) {
        if($section !== false) {
          $code = trim($match[7]);
          $idx = 0;
          $inQuote = false;
          $property = false;
          $codeLen = strlen($code);
          $parenthesis = array();
          while($idx < $codeLen && isset($code{$idx})) {
            $c = $code{$idx};
            $idx++;
            if($inQuote !== false) {
              if($inQuote === $c) {
                $inQuote = false;
              }
            } elseif(($inQuote === false) && ($c == '(')) {
              array_push($parenthesis, '(');
            } elseif(($inQuote === false) && ($c == ')')) {
              array_pop($parenthesis);
            } elseif(($c == '\'') || ($c == '"')) {
              $inQuote = $c;
            } elseif(($property === false) && ($c == ':')) {
              $property = trim(substr($code, 0, $idx - 1));
              if(preg_match('/^(.*)\[([0-9]*)\]$/Us', $property, $propMatch)) {
                $property = $propMatch[1].'['.static::$propCounter.']';
                static::$propCounter += 1;
              }
              $code = substr($code, $idx);
              $idx = 0;
            } elseif((count($parenthesis) == 0) && ($c == ';')) {
              $value = trim(substr($code, 0, $idx - 1));
              $code = substr($code, $idx);
              $idx = 0;
              $this->AddProperty($index, $currentMedia, $section, $property, $value);
              $property = false;
            }
          }
          if(($idx > 0) && ($property !== false)) {
            $value = trim($code);
            $this->AddProperty($index, $currentMedia, $section, $property, $value);
          }
          $section = false;
        } elseif(count($mediaList) > 0) {
          array_pop($mediaList);
          if(count($mediaList) > 0) {
            $currentMedia = end($mediaList);
          } else {
            $currentMedia = 'all';
          }
        } else {
          // Superfluous }
        }
      } elseif(isset($match[6]) && ($match[6] == '{')) {
        // Section
        $section = trim($match[5]);
        if(!isset($this->cssData[$index][$currentMedia][$section])) {
          $this->cssData[$index][$currentMedia][$section] = array();
        }
      } elseif(isset($match[4]) && ($match[4] == '{')) {
        if($match[2] == 'media') {
          // New media
          $media = trim($match[3]);
          $mediaList[] = $media;
          $currentMedia = $media;
          if(!isset($this->cssData[$index][$currentMedia])) {
            $this->cssData[$index][$currentMedia] = array();
          }
        } elseif($match[2] == 'import') {
          // Can't support import (yet!)
        } elseif($match[2] == 'local') {
          // Can't support local import (yet!)
        }
      } else {
        // Shouldn't get here
      }
      $stripCount = strlen($match[0]);
      $css = trim(substr($css, $stripCount));
    }
    $css = trim($css);
    if(strlen($css) > 0) {
      echo "Potential error in stylesheet\n".$css;
    }
    return $index;
  }
 
  public function AddProperty($index, $media, $section, $property, $value) {
    if(!isset($this->cssData[$index])) {
      $this->cssData[$index] = array('all'=>array(),'screen'=>array(),'print'=>array());
    }
    $media = trim($media);
    if($media == '') {
      $media = 'all';
    }
    $section = trim($section);
    $property = trim($property);
    if(strlen($property) > 0) {
      $value = trim($value);
      if($media == 'all') {
        $this->cssData[$index][$media][$section][$property] = $value;
        $keys = array_keys($this->cssData[$index]);
        foreach($keys as $key) {
          if(!isset($this->cssData[$index][$key][$section])) {
            $this->cssData[$index][$key][$section] = array();
          }
          $this->cssData[$index][$key][$section][$property] = $value;
        }
      } else {
        if(!isset($this->cssData[$index][$media])) {
          $this->cssData[$index][$media] = $this->cssData[$index]['all'];
        }
        if(!isset($this->cssData[$index][$media][$section])) {
          $this->cssData[$index][$media][$section] = array();
        }
        $this->cssData[$index][$media][$section][$property] = $value;
      }
    }
  }
 
  public function GetMediaList($index) {
    if(isset($this->cssData[$index])) {
      return array_keys($this->cssData[$index]);
    }
    return array();
  }
 
  public function ExportKeyValues($index, $media, $keys) {
    $result = array();
    if(is_string($keys)) {
      $keys = array($keys);
    }
    if(!is_array($keys)) {
      return $result;
    }
    if(isset($this->cssData[$index]) && isset($this->cssData[$index][$media])) {
      foreach($this->cssData[$index][$media] as $section => $sectionValues) {
        foreach($sectionValues as $property => $value) {
          if(in_array($property, $keys)) {
            $result[] = $value;
          }
        }
      }
    }
    return $result;
  }
  
  public function ExportMedia($index, $media, $block = false) {
    $result = '';
    if(isset($this->cssData[$index]) && isset($this->cssData[$index][$media])) {
      foreach($this->cssData[$index][$media] as $section => $sectionValues) {
        $result .= "$section {\n";
        foreach($sectionValues as $property => $value) {
          $property = preg_replace('/(\[[0-9]*\])$/Usi', '', $property);
          if(is_array($block) && isset($block[$property])) {
            if(preg_match('/^'.static::ConvertWildcards($block[$property]).'$/Usi', $value) == 0) {
              $result .= $indent."  $property: $value;\n";
            }
          } else {
            $result .= "  $property: $value;\n";
          }
        }
        $result .= "}\n\n";
      }
    }
    return $result;
  }
  
  public function ExportStyle($index, $block = false) {
    $result = '';
    if(isset($this->cssData[$index])) {
      foreach($this->cssData[$index] as $media => $mediaValues) {
        if($media != 'all') {
          $result .= "@media $media {\n";
          $indent = '  ';
        } else {
          $indent = '';
        }
        foreach($mediaValues as $section => $sectionValues) {
          $result .= $indent."$section {\n";
          foreach($sectionValues as $property => $value) {
            $property = preg_replace('/(\[[0-9]*\])$/Usi', '', $property);
            if(is_array($block) && isset($block[$property])) {
              if(preg_match('/^'.static::ConvertWildcards($block[$property]).'$/Usi', $value) == 0) {
                $result .= $indent."  $property: $value;\n";
              }
            } else {
              $result .= $indent."  $property: $value;\n";
            }
          }
          $result .= $indent."}\n\n";
        }
        if($media != 'all') {
          $result .= "}\n\n";
        }
      }
    }
    return $result;
  }


  public function GetSections($index, $media = 'screen') {
    if(isset($this->cssData[$index])) {
      if(isset($this->cssData[$index][$media])) {
        return array_keys($this->cssData[$index][$media]);
      }
      if(isset($this->cssData[$index]['all'])) {
        return array_keys($this->cssData[$index]['all']);
      }
    }
    return false;
  }

  public function GetSectionsFiltered($index, $matchKey, $matchValue, $media = 'screen') {
    if(isset($this->cssData[$index])) {
      if(!isset($this->cssData[$index][$media])) {
        $media = 'all';
        if(!isset($this->cssData[$index][$media])) {
          return false;
        }
      }
      if(is_array($this->cssData[$index][$media])) {
        $result = array();
        foreach($this->cssData[$index][$media] as $section => $values) {
          if(isset($values[$matchKey])) {
            if($values[$matchKey] == $matchValue) {
              $result[] = $section;
            }
          }
        }
        return $result;
      }
    }
    return false;
  }

  public function GetEditorCSS($index) {
    $forbiddenKeys = array();
    $forbiddenKeys[] = '^filter$';
    return $this->GetCSS($index, 'screen', $forbiddenKeys);
  }
  
  public function GetCSS($index, $media = 'screen', $forbiddenKeys = array()) {
    if(isset($this->cssData[$index])) {
      if(!isset($this->cssData[$index][$media])) {
        $media = 'all';
        if(!isset($this->cssData[$index][$media])) {
          return false;
        }
      }
      if(is_array($this->cssData[$index][$media])) {
        $result = '';
        foreach($this->cssData[$index][$media] as $section => $values) {
          $result .= $section.' {';
          $result .= "\n";
          if(is_array($values)) {
            foreach($values as $key => $value) {
              $skipThis = false;
              foreach($forbiddenKeys as $fKey) {
                if(preg_match('/'.$fKey.'/Usi', $key)) {
                  $skipThis = true;
                  break;
                }
              }
              if($skipThis) {
                continue;
              }
              $result .= '  ';
              $key = preg_replace('/(\[[0-9]*\])$/Usi', '', $key);
              $result .= $key.': '.$value.';';
              $result .= "\n";
            }
          }
          $result .= '}';
          $result .= "\n";
        }
        return $result;
      }
    }
    return false;
  }

  public function GetCSSFiltered($index, $matchKey, $matchValue, $media = 'screen') {
    if(!isset($this->cssData[$index])) {
      if(!isset($this->cssData[$index][$media])) {
        $media = 'all';
        if(!isset($this->cssData[$index][$media])) {
          return false;
        }
      }
    }
    $sections = $this->GetSectionsFiltered($index, $matchKey, $matchValue, $media);
    if($sections !== false) {
      if(is_array($sections)) {
        $result = '';
        foreach($sections as $section) {
          $result .= $section.' {';
          $temp = $this->cssData[$index][$media];
          if(is_array($temp)) {
            foreach($temp as $key => $value) {
              $key = preg_replace('/(\[[0-9]*\])$/Usi', '', $key);
              $result .= $key.': '.$value.';';
            }
          }
          $result .= $section.' }';
        }
        return $result;
      }
    }
    return false;
  }

  public function GetCSSArray($index, $media = 'screen') {
    if(isset($this->cssData[$index])) {
      if(isset($this->cssData[$index][$media])) {
        return $this->cssData[$index][$media];
      } elseif(isset($this->cssData[$index]['all'])) {
        return $this->cssData[$index][$media];
      }
    }
    return false;
  }
  
  public static function ConvertWildcards($text) {
    $text = str_replace('.', '\.', $text);
    $text = str_replace('*', '.*', $text);
    $text = str_replace('?', '.', $text);
    return $text;
  }
}