library/HTMLPurifier/AttrDef/CSS/Multiple.php

   1 <?php
   2
   3 /**
   4  * Framework class for strings that involve multiple values.
   5  *
   6  * Certain CSS properties such as border-width and margin allow multiple
   7  * lengths to be specified.  This class can take a vanilla border-width
   8  * definition and multiply it, usually into a max of four.
   9  *
  10  * @note Even though the CSS specification isn't clear about it, inherit
  11  *       can only be used alone: it will never manifest as part of a multi
  12  *       shorthand declaration.  Thus, this class does not allow inherit.
  13  */
  14 class HTMLPurifier_AttrDef_CSS_Multiple extends HTMLPurifier_AttrDef
  15 {
  16
  17     /**
  18      * Instance of component definition to defer validation to.
  19      * @todo Make protected
  20      */
  21     public $single;
  22
  23     /**
  24      * Max number of values allowed.
  25      * @todo Make protected
  26      */
  27     public $max;
  28
  29     /**
  30      * @param $single HTMLPurifier_AttrDef to multiply
  31      * @param $max Max number of values allowed (usually four)
  32      */
  33     public function __construct($single, $max = 4) {
  34         $this->single = $single;
  35         $this->max = $max;
  36     }
  37
  38     public function validate($string, $config, $context) {
  39         $string = $this->parseCDATA($string);
  40         if ($string === '') return false;
  41         $parts = explode(' ', $string); // parseCDATA replaced \r, \t and \n
  42         $length = count($parts);
  43         $final = '';
  44         for ($i = 0, $num = 0; $i < $length && $num < $this->max; $i++) {
  45             if (ctype_space($parts[$i])) continue;
  46             $result = $this->single->validate($parts[$i], $config, $context);
  47             if ($result !== false) {
  48                 $final .= $result . ' ';
  49                 $num++;
  50             }
  51         }
  52         if ($final === '') return false;
  53         return rtrim($final);
  54     }
  55
  56 }
  57
  58 // vim: et sw=4 sts=4