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      * @type HTMLPurifier_AttrDef[]
  13      * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
  14      */
  15     protected $info;
  16
  17     /**
  18      * @param HTMLPurifier_Config $config
  19      */
  20     public function __construct($config)
  21     {
  22         $def = $config->getCSSDefinition();
  23         $this->info['background-color'] = $def->info['background-color'];
  24         $this->info['background-image'] = $def->info['background-image'];
  25         $this->info['background-repeat'] = $def->info['background-repeat'];
  26         $this->info['background-attachment'] = $def->info['background-attachment'];
  27         $this->info['background-position'] = $def->info['background-position'];
  28     }
  29
  30     /**
  31      * @param string $string
  32      * @param HTMLPurifier_Config $config
  33      * @param HTMLPurifier_Context $context
  34      * @return bool|string
  35      */
  36     public function validate($string, $config, $context)
  37     {
  38         // regular pre-processing
  39         $string = $this->parseCDATA($string);
  40         if ($string === '') {
  41             return false;
  42         }
  43
  44         // munge rgb() decl if necessary
  45         $string = $this->mungeRgb($string);
  46
  47         // assumes URI doesn't have spaces in it
  48         $bits = explode(' ', $string); // bits to process
  49
  50         $caught = array();
  51         $caught['color'] = false;
  52         $caught['image'] = false;
  53         $caught['repeat'] = false;
  54         $caught['attachment'] = false;
  55         $caught['position'] = false;
  56
  57         $i = 0; // number of catches
  58
  59         foreach ($bits as $bit) {
  60             if ($bit === '') {
  61                 continue;
  62             }
  63             foreach ($caught as $key => $status) {
  64                 if ($key != 'position') {
  65                     if ($status !== false) {
  66                         continue;
  67                     }
  68                     $r = $this->info['background-' . $key]->validate($bit, $config, $context);
  69                 } else {
  70                     $r = $bit;
  71                 }
  72                 if ($r === false) {
  73                     continue;
  74                 }
  75                 if ($key == 'position') {
  76                     if ($caught[$key] === false) {
  77                         $caught[$key] = '';
  78                     }
  79                     $caught[$key] .= $r . ' ';
  80                 } else {
  81                     $caught[$key] = $r;
  82                 }
  83                 $i++;
  84                 break;
  85             }
  86         }
  87
  88         if (!$i) {
  89             return false;
  90         }
  91         if ($caught['position'] !== false) {
  92             $caught['position'] = $this->info['background-position']->
  93                 validate($caught['position'], $config, $context);
  94         }
  95
  96         $ret = array();
  97         foreach ($caught as $value) {
  98             if ($value === false) {
  99                 continue;
 100             }
 101             $ret[] = $value;
 102         }
 103
 104         if (empty($ret)) {
 105             return false;
 106         }
 107         return implode(' ', $ret);
 108     }
 109 }
 110
 111 // vim: et sw=4 sts=4