library/HTMLPurifier/AttrDef/CSS/Background.php

   1 <?php
   2
   3 /**
   4  * Validates shorthand CSS property background.
   5  * @warning Does not support url tokens that have internal spaces.
   6  */
   7 class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
   8 {
   9
  10     /**
  11      * Local copy of component validators.
  12      * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
  13      */
  14     protected $info;
  15
  16     public function __construct($config) {
  17         $def = $config->getCSSDefinition();
  18         $this->info['background-color'] = $def->info['background-color'];
  19         $this->info['background-image'] = $def->info['background-image'];
  20         $this->info['background-repeat'] = $def->info['background-repeat'];
  21         $this->info['background-attachment'] = $def->info['background-attachment'];
  22         $this->info['background-position'] = $def->info['background-position'];
  23     }
  24
  25     public function validate($string, $config, $context) {
  26
  27         // regular pre-processing
  28         $string = $this->parseCDATA($string);
  29         if ($string === '') return false;
  30
  31         // munge rgb() decl if necessary
  32         $string = $this->mungeRgb($string);
  33
  34         // assumes URI doesn't have spaces in it
  35         $bits = explode(' ', $string); // bits to process
  36
  37         $caught = array();
  38         $caught['color']    = false;
  39         $caught['image']    = false;
  40         $caught['repeat']   = false;
  41         $caught['attachment'] = false;
  42         $caught['position'] = false;
  43
  44         $i = 0; // number of catches
  45         $none = false;
  46
  47         foreach ($bits as $bit) {
  48             if ($bit === '') continue;
  49             foreach ($caught as $key => $status) {
  50                 if ($key != 'position') {
  51                     if ($status !== false) continue;
  52                     $r = $this->info['background-' . $key]->validate($bit, $config, $context);
  53                 } else {
  54                     $r = $bit;
  55                 }
  56                 if ($r === false) continue;
  57                 if ($key == 'position') {
  58                     if ($caught[$key] === false) $caught[$key] = '';
  59                     $caught[$key] .= $r . ' ';
  60                 } else {
  61                     $caught[$key] = $r;
  62                 }
  63                 $i++;
  64                 break;
  65             }
  66         }
  67
  68         if (!$i) return false;
  69         if ($caught['position'] !== false) {
  70             $caught['position'] = $this->info['background-position']->
  71                 validate($caught['position'], $config, $context);
  72         }
  73
  74         $ret = array();
  75         foreach ($caught as $value) {
  76             if ($value === false) continue;
  77             $ret[] = $value;
  78         }
  79
  80         if (empty($ret)) return false;
  81         return implode(' ', $ret);
  82
  83     }
  84
  85 }
  86
  87 // vim: et sw=4 sts=4