library/ezyang/htmlpurifier/library/HTMLPurifier/Injector/RemoveEmpty.php

   1 <?php
   2
   3 class HTMLPurifier_Injector_RemoveEmpty extends HTMLPurifier_Injector
   4 {
   5     /**
   6      * @type HTMLPurifier_Context
   7      */
   8     private $context;
   9
  10     /**
  11      * @type HTMLPurifier_Config
  12      */
  13     private $config;
  14
  15     /**
  16      * @type HTMLPurifier_AttrValidator
  17      */
  18     private $attrValidator;
  19
  20     /**
  21      * @type bool
  22      */
  23     private $removeNbsp;
  24
  25     /**
  26      * @type bool
  27      */
  28     private $removeNbspExceptions;
  29
  30     /**
  31      * Cached contents of %AutoFormat.RemoveEmpty.Predicate
  32      * @type array
  33      */
  34     private $exclude;
  35
  36     /**
  37      * @param HTMLPurifier_Config $config
  38      * @param HTMLPurifier_Context $context
  39      * @return void
  40      */
  41     public function prepare($config, $context)
  42     {
  43         parent::prepare($config, $context);
  44         $this->config = $config;
  45         $this->context = $context;
  46         $this->removeNbsp = $config->get('AutoFormat.RemoveEmpty.RemoveNbsp');
  47         $this->removeNbspExceptions = $config->get('AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions');
  48         $this->exclude = $config->get('AutoFormat.RemoveEmpty.Predicate');
  49         $this->attrValidator = new HTMLPurifier_AttrValidator();
  50     }
  51
  52     /**
  53      * @param HTMLPurifier_Token $token
  54      */
  55     public function handleElement(&$token)
  56     {
  57         if (!$token instanceof HTMLPurifier_Token_Start) {
  58             return;
  59         }
  60         $next = false;
  61         $deleted = 1; // the current tag
  62         for ($i = count($this->inputZipper->back) - 1; $i >= 0; $i--, $deleted++) {
  63             $next = $this->inputZipper->back[$i];
  64             if ($next instanceof HTMLPurifier_Token_Text) {
  65                 if ($next->is_whitespace) {
  66                     continue;
  67                 }
  68                 if ($this->removeNbsp && !isset($this->removeNbspExceptions[$token->name])) {
  69                     $plain = str_replace("\xC2\xA0", "", $next->data);
  70                     $isWsOrNbsp = $plain === '' || ctype_space($plain);
  71                     if ($isWsOrNbsp) {
  72                         continue;
  73                     }
  74                 }
  75             }
  76             break;
  77         }
  78         if (!$next || ($next instanceof HTMLPurifier_Token_End && $next->name == $token->name)) {
  79             $this->attrValidator->validateToken($token, $this->config, $this->context);
  80             $token->armor['ValidateAttributes'] = true;
  81             if (isset($this->exclude[$token->name])) {
  82                 $r = true;
  83                 foreach ($this->exclude[$token->name] as $elem) {
  84                     if (!isset($token->attr[$elem])) $r = false;
  85                 }
  86                 if ($r) return;
  87             }
  88             if (isset($token->attr['id']) || isset($token->attr['name'])) {
  89                 return;
  90             }
  91             $token = $deleted + 1;
  92             for ($b = 0, $c = count($this->inputZipper->front); $b < $c; $b++) {
  93                 $prev = $this->inputZipper->front[$b];
  94                 if ($prev instanceof HTMLPurifier_Token_Text && $prev->is_whitespace) {
  95                     continue;
  96                 }
  97                 break;
  98             }
  99             // This is safe because we removed the token that triggered this.
 100             $this->rewindOffset($b+$deleted);
 101             return;
 102         }
 103     }
 104 }
 105
 106 // vim: et sw=4 sts=4