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 <?php
 
 /**
  * Validates the attributes of a token. Doesn't manage required attributes
  * very well. The only reason we factored this out was because RemoveForeignElements
  * also needed it besides ValidateAttributes.
  */
 class HTMLPurifier_AttrValidator
 {
 
     /**
      * Validates the attributes of a token, mutating it as necessary.
      * that has valid tokens
      * @param HTMLPurifier_Token $token Token to validate.
      * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
      * @param HTMLPurifier_Context $context Instance of HTMLPurifier_Context
      */
     public function validateToken($token, $config, $context)
     {
         $definition = $config->getHTMLDefinition();
         $e =& $context->get('ErrorCollector', true);
 
         // initialize IDAccumulator if necessary
         $ok =& $context->get('IDAccumulator', true);
         if (!$ok) {
             $id_accumulator = HTMLPurifier_IDAccumulator::build($config, $context);
             $context->register('IDAccumulator', $id_accumulator);
         }
 
         // initialize CurrentToken if necessary
         $current_token =& $context->get('CurrentToken', true);
         if (!$current_token) {
             $context->register('CurrentToken', $token);
         }
 
         if (!$token instanceof HTMLPurifier_Token_Start &&
             !$token instanceof HTMLPurifier_Token_Empty
         ) {
             return;
         }
 
         // create alias to global definition array, see also $defs
         // DEFINITION CALL
         $d_defs = $definition->info_global_attr;
 
         // don't update token until the very end, to ensure an atomic update
         $attr = $token->attr;
 
         // do global transformations (pre)
         // nothing currently utilizes this
         foreach ($definition->info_attr_transform_pre as $transform) {
             $attr = $transform->transform($o = $attr, $config, $context);
             if ($e) {
                 if ($attr != $o) {
                     $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
                 }
             }
         }
 
         // do local transformations only applicable to this element (pre)
         // ex. <p align="right"> to <p style="text-align:right;">
         foreach ($definition->info[$token->name]->attr_transform_pre as $transform) {
             $attr = $transform->transform($o = $attr, $config, $context);
             if ($e) {
                 if ($attr != $o) {
                     $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
                 }
             }
         }
 
         // create alias to this element's attribute definition array, see
         // also $d_defs (global attribute definition array)
         // DEFINITION CALL
         $defs = $definition->info[$token->name]->attr;
 
         $attr_key = false;
         $context->register('CurrentAttr', $attr_key);
 
         // iterate through all the attribute keypairs
         // Watch out for name collisions: $key has previously been used
         foreach ($attr as $attr_key => $value) {
 
             // call the definition
             if (isset($defs[$attr_key])) {
                 // there is a local definition defined
                 if ($defs[$attr_key] === false) {
                     // We've explicitly been told not to allow this element.
                     // This is usually when there's a global definition
                     // that must be overridden.
                     // Theoretically speaking, we could have a
                     // AttrDef_DenyAll, but this is faster!
                     $result = false;
                 } else {
                     // validate according to the element's definition
                     $result = $defs[$attr_key]->validate(
                         $value,
                         $config,
                         $context
                     );
                 }
             } elseif (isset($d_defs[$attr_key])) {
                 // there is a global definition defined, validate according
                 // to the global definition
                 $result = $d_defs[$attr_key]->validate(
                     $value,
                     $config,
                     $context
                 );
             } else {
                 // system never heard of the attribute? DELETE!
                 $result = false;
             }
 
             // put the results into effect
             if ($result === false || $result === null) {
                 // this is a generic error message that should replaced
                 // with more specific ones when possible
                 if ($e) {
                     $e->send(E_ERROR, 'AttrValidator: Attribute removed');
                 }
 
                 // remove the attribute
                 unset($attr[$attr_key]);
             } elseif (is_string($result)) {
                 // generally, if a substitution is happening, there
                 // was some sort of implicit correction going on. We'll
                 // delegate it to the attribute classes to say exactly what.
 
                 // simple substitution
                 $attr[$attr_key] = $result;
             } else {
                 // nothing happens
             }
 
             // we'd also want slightly more complicated substitution
             // involving an array as the return value,
             // although we're not sure how colliding attributes would
             // resolve (certain ones would be completely overriden,
             // others would prepend themselves).
         }
 
         $context->destroy('CurrentAttr');
 
         // post transforms
 
         // global (error reporting untested)
         foreach ($definition->info_attr_transform_post as $transform) {
             $attr = $transform->transform($o = $attr, $config, $context);
             if ($e) {
                 if ($attr != $o) {
                     $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
                 }
             }
         }
 
         // local (error reporting untested)
         foreach ($definition->info[$token->name]->attr_transform_post as $transform) {
             $attr = $transform->transform($o = $attr, $config, $context);
             if ($e) {
                 if ($attr != $o) {
                     $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
                 }
             }
         }
 
         $token->attr = $attr;
 
         // destroy CurrentToken if we made it ourselves
         if (!$current_token) {
             $context->destroy('CurrentToken');
         }
 
     }
 
 
 }
 
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