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Diffstat (limited to 'library/HTMLPurifier/HTMLModule.php')
| -rw-r--r-- | library/HTMLPurifier/HTMLModule.php | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/library/HTMLPurifier/HTMLModule.php b/library/HTMLPurifier/HTMLModule.php new file mode 100644 index 000000000..072cf6808 --- /dev/null +++ b/library/HTMLPurifier/HTMLModule.php @@ -0,0 +1,244 @@ +<?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 + */ + public $name; + + /** + * Informally, a list of elements this module changes. Not used in + * any significant way. + */ + 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. + */ + 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. + */ + 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. + */ + public $attr_collections = array(); + + /** + * Associative array of deprecated tag name to HTMLPurifier_TagTransform + */ + public $info_tag_transform = array(); + + /** + * List of HTMLPurifier_AttrTransform to be performed before validation. + */ + public $info_attr_transform_pre = array(); + + /** + * List of HTMLPurifier_AttrTransform to be performed after validation. + */ + 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. + */ + 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! + */ + 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") + * + * @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 $def HTMLPurifier_ElementDef instance + * @return HTMLPurifier_ChildDef subclass + */ + public function getChildDef($def) {return false;} + + // -- Convenience ----------------------------------------------------- + + /** + * Convenience function that sets up a new element + * @param $element Name of element to add + * @param $type What content set should element be registered to? + * Set as false to skip this step. + * @param $contents Allowed children in form of: + * "$content_model_type: $content_model" + * @param $attr_includes What attribute collections to register to + * element? + * @param $attr What unique attributes does the element define? + * @note See ElementDef for in-depth descriptions of these parameters. + * @return Created element definition object, so you + * can set advanced parameters + */ + public function addElement($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 $element Name of element to create + * @return Created element + */ + public function addBlankElement($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 Element to register + * @param 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 $contents Allowed children in form of: + * "$content_model_type: $content_model" + * @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 $attr Reference to attr array to modify + * @param $attr_includes Array of includes / string include to merge in + */ + public function mergeInAttrIncludes(&$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 $list List of values to turn into a lookup + * @note You can also pass an arbitrary number of arguments in + * place of the regular argument + * @return Lookup array equivalent of list + */ + public function makeLookup($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 $config Instance of HTMLPurifier_Config + */ + public function setup($config) {} + +} + +// vim: et sw=4 sts=4 |