library/HTMLPurifier/AttrTransform/EnumToCSS.php

   1 <?php
   2
   3 /**
   4  * Generic pre-transform that converts an attribute with a fixed number of
   5  * values (enumerated) to CSS.
   6  */
   7 class HTMLPurifier_AttrTransform_EnumToCSS extends HTMLPurifier_AttrTransform
   8 {
   9     /**
  10      * Name of attribute to transform from.
  11      * @type string
  12      */
  13     protected $attr;
  14
  15     /**
  16      * Lookup array of attribute values to CSS.
  17      * @type array
  18      */
  19     protected $enumToCSS = array();
  20
  21     /**
  22      * Case sensitivity of the matching.
  23      * @type bool
  24      * @warning Currently can only be guaranteed to work with ASCII
  25      *          values.
  26      */
  27     protected $caseSensitive = false;
  28
  29     /**
  30      * @param string $attr Attribute name to transform from
  31      * @param array $enum_to_css Lookup array of attribute values to CSS
  32      * @param bool $case_sensitive Case sensitivity indicator, default false
  33      */
  34     public function __construct($attr, $enum_to_css, $case_sensitive = false)
  35     {
  36         $this->attr = $attr;
  37         $this->enumToCSS = $enum_to_css;
  38         $this->caseSensitive = (bool)$case_sensitive;
  39     }
  40
  41     /**
  42      * @param array $attr
  43      * @param HTMLPurifier_Config $config
  44      * @param HTMLPurifier_Context $context
  45      * @return array
  46      */
  47     public function transform($attr, $config, $context)
  48     {
  49         if (!isset($attr[$this->attr])) {
  50             return $attr;
  51         }
  52
  53         $value = trim($attr[$this->attr]);
  54         unset($attr[$this->attr]);
  55
  56         if (!$this->caseSensitive) {
  57             $value = strtolower($value);
  58         }
  59
  60         if (!isset($this->enumToCSS[$value])) {
  61             return $attr;
  62         }
  63         $this->prependCSS($attr, $this->enumToCSS[$value]);
  64         return $attr;
  65     }
  66 }
  67
  68 // vim: et sw=4 sts=4