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 <?php
 
 /**
  * Represents an XHTML 1.1 module, with information on elements, tags
  * and attributes.
  * @note Even though this is technically XHTML 1.1, it is also used for
  *       regular HTML parsing. We are using modulization as a convenient
  *       way to represent the internals of HTMLDefinition, and our
  *       implementation is by no means conforming and does not directly
  *       use the normative DTDs or XML schemas.
  * @note The public variables in a module should almost directly
  *       correspond to the variables in HTMLPurifier_HTMLDefinition.
  *       However, the prefix info carries no special meaning in these
  *       objects (include it anyway if that's the correspondence though).
  * @todo Consider making some member functions protected
  */
 
 class HTMLPurifier_HTMLModule
 {
 
     // -- Overloadable ----------------------------------------------------
 
     /**
      * Short unique string identifier of the module.
      * @type string
      */
     public $name;
 
     /**
      * Informally, a list of elements this module changes.
      * Not used in any significant way.
      * @type array
      */
     public $elements = array();
 
     /**
      * Associative array of element names to element definitions.
      * Some definitions may be incomplete, to be merged in later
      * with the full definition.
      * @type array
      */
     public $info = array();
 
     /**
      * Associative array of content set names to content set additions.
      * This is commonly used to, say, add an A element to the Inline
      * content set. This corresponds to an internal variable $content_sets
      * and NOT info_content_sets member variable of HTMLDefinition.
      * @type array
      */
     public $content_sets = array();
 
     /**
      * Associative array of attribute collection names to attribute
      * collection additions. More rarely used for adding attributes to
      * the global collections. Example is the StyleAttribute module adding
      * the style attribute to the Core. Corresponds to HTMLDefinition's
      * attr_collections->info, since the object's data is only info,
      * with extra behavior associated with it.
      * @type array
      */
     public $attr_collections = array();
 
     /**
      * Associative array of deprecated tag name to HTMLPurifier_TagTransform.
      * @type array
      */
     public $info_tag_transform = array();
 
     /**
      * List of HTMLPurifier_AttrTransform to be performed before validation.
      * @type array
      */
     public $info_attr_transform_pre = array();
 
     /**
      * List of HTMLPurifier_AttrTransform to be performed after validation.
      * @type array
      */
     public $info_attr_transform_post = array();
 
     /**
      * List of HTMLPurifier_Injector to be performed during well-formedness fixing.
      * An injector will only be invoked if all of it's pre-requisites are met;
      * if an injector fails setup, there will be no error; it will simply be
      * silently disabled.
      * @type array
      */
     public $info_injector = array();
 
     /**
      * Boolean flag that indicates whether or not getChildDef is implemented.
      * For optimization reasons: may save a call to a function. Be sure
      * to set it if you do implement getChildDef(), otherwise it will have
      * no effect!
      * @type bool
      */
     public $defines_child_def = false;
 
     /**
      * Boolean flag whether or not this module is safe. If it is not safe, all
      * of its members are unsafe. Modules are safe by default (this might be
      * slightly dangerous, but it doesn't make much sense to force HTML Purifier,
      * which is based off of safe HTML, to explicitly say, "This is safe," even
      * though there are modules which are "unsafe")
      *
      * @type bool
      * @note Previously, safety could be applied at an element level granularity.
      *       We've removed this ability, so in order to add "unsafe" elements
      *       or attributes, a dedicated module with this property set to false
      *       must be used.
      */
     public $safe = true;
 
     /**
      * Retrieves a proper HTMLPurifier_ChildDef subclass based on
      * content_model and content_model_type member variables of
      * the HTMLPurifier_ElementDef class. There is a similar function
      * in HTMLPurifier_HTMLDefinition.
      * @param HTMLPurifier_ElementDef $def
      * @return HTMLPurifier_ChildDef subclass
      */
     public function getChildDef($def)
     {
         return false;
     }
 
     // -- Convenience -----------------------------------------------------
 
     /**
      * Convenience function that sets up a new element
      * @param string $element Name of element to add
      * @param string|bool $type What content set should element be registered to?
      *              Set as false to skip this step.
      * @param string $contents Allowed children in form of:
      *              "$content_model_type: $content_model"
      * @param array $attr_includes What attribute collections to register to
      *              element?
      * @param array $attr What unique attributes does the element define?
      * @see HTMLPurifier_ElementDef:: for in-depth descriptions of these parameters.
      * @return HTMLPurifier_ElementDef Created element definition object, so you
      *         can set advanced parameters
      */
     public function addElement($element, $type, $contents, $attr_includes = array(), $attr = array())
     {
         $this->elements[] = $element;
         // parse content_model
         list($content_model_type, $content_model) = $this->parseContents($contents);
         // merge in attribute inclusions
         $this->mergeInAttrIncludes($attr, $attr_includes);
         // add element to content sets
         if ($type) {
             $this->addElementToContentSet($element, $type);
         }
         // create element
         $this->info[$element] = HTMLPurifier_ElementDef::create(
             $content_model,
             $content_model_type,
             $attr
         );
         // literal object $contents means direct child manipulation
         if (!is_string($contents)) {
             $this->info[$element]->child = $contents;
         }
         return $this->info[$element];
     }
 
     /**
      * Convenience function that creates a totally blank, non-standalone
      * element.
      * @param string $element Name of element to create
      * @return HTMLPurifier_ElementDef Created element
      */
     public function addBlankElement($element)
     {
         if (!isset($this->info[$element])) {
             $this->elements[] = $element;
             $this->info[$element] = new HTMLPurifier_ElementDef();
             $this->info[$element]->standalone = false;
         } else {
             trigger_error("Definition for $element already exists in module, cannot redefine");
         }
         return $this->info[$element];
     }
 
     /**
      * Convenience function that registers an element to a content set
      * @param string $element Element to register
      * @param string $type Name content set (warning: case sensitive, usually upper-case
      *        first letter)
      */
     public function addElementToContentSet($element, $type)
     {
         if (!isset($this->content_sets[$type])) {
             $this->content_sets[$type] = '';
         } else {
             $this->content_sets[$type] .= ' | ';
         }
         $this->content_sets[$type] .= $element;
     }
 
     /**
      * Convenience function that transforms single-string contents
      * into separate content model and content model type
      * @param string $contents Allowed children in form of:
      *                  "$content_model_type: $content_model"
      * @return array
      * @note If contents is an object, an array of two nulls will be
      *       returned, and the callee needs to take the original $contents
      *       and use it directly.
      */
     public function parseContents($contents)
     {
         if (!is_string($contents)) {
             return array(null, null);
         } // defer
         switch ($contents) {
             // check for shorthand content model forms
             case 'Empty':
                 return array('empty', '');
             case 'Inline':
                 return array('optional', 'Inline | #PCDATA');
             case 'Flow':
                 return array('optional', 'Flow | #PCDATA');
         }
         list($content_model_type, $content_model) = explode(':', $contents);
         $content_model_type = strtolower(trim($content_model_type));
         $content_model = trim($content_model);
         return array($content_model_type, $content_model);
     }
 
     /**
      * Convenience function that merges a list of attribute includes into
      * an attribute array.
      * @param array $attr Reference to attr array to modify
      * @param array $attr_includes Array of includes / string include to merge in
      */
     public function mergeInAttrIncludes(&$attr, $attr_includes)
     {
         if (!is_array($attr_includes)) {
             if (empty($attr_includes)) {
                 $attr_includes = array();
             } else {
                 $attr_includes = array($attr_includes);
             }
         }
         $attr[0] = $attr_includes;
     }
 
     /**
      * Convenience function that generates a lookup table with boolean
      * true as value.
      * @param string $list List of values to turn into a lookup
      * @note You can also pass an arbitrary number of arguments in
      *       place of the regular argument
      * @return array array equivalent of list
      */
     public function makeLookup($list)
     {
         if (is_string($list)) {
             $list = func_get_args();
         }
         $ret = array();
         foreach ($list as $value) {
             if (is_null($value)) {
                 continue;
             }
             $ret[$value] = true;
         }
         return $ret;
     }
 
     /**
      * Lazy load construction of the module after determining whether
      * or not it's needed, and also when a finalized configuration object
      * is available.
      * @param HTMLPurifier_Config $config
      */
     public function setup($config)
     {
     }
 }
 
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