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ElementDef.php
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<?php /** * Structure that stores an HTML element definition. Used by * HTMLPurifier_HTMLDefinition and HTMLPurifier_HTMLModule. * @note This class is inspected by HTMLPurifier_Printer_HTMLDefinition. * Please update that class too. * @warning If you add new properties to this class, you MUST update * the mergeIn() method. */ class HTMLPurifier_ElementDef { /** * Does the definition work by itself, or is it created solely * for the purpose of merging into another definition? * @type bool */ public $standalone = true; /** * Associative array of attribute name to HTMLPurifier_AttrDef. * @type array * @note Before being processed by HTMLPurifier_AttrCollections * when modules are finalized during * HTMLPurifier_HTMLDefinition->setup(), this array may also * contain an array at index 0 that indicates which attribute * collections to load into the full array. It may also * contain string indentifiers in lieu of HTMLPurifier_AttrDef, * see HTMLPurifier_AttrTypes on how they are expanded during * HTMLPurifier_HTMLDefinition->setup() processing. */ public $attr = array(); // XXX: Design note: currently, it's not possible to override // previously defined AttrTransforms without messing around with // the final generated config. This is by design; a previous version // used an associated list of attr_transform, but it was extremely // easy to accidentally override other attribute transforms by // forgetting to specify an index (and just using 0.) While we // could check this by checking the index number and complaining, // there is a second problem which is that it is not at all easy to // tell when something is getting overridden. Combine this with a // codebase where this isn't really being used, and it's perfect for // nuking. /** * List of tags HTMLPurifier_AttrTransform to be done before validation. * @type array */ public $attr_transform_pre = array(); /** * List of tags HTMLPurifier_AttrTransform to be done after validation. * @type array */ public $attr_transform_post = array(); /** * HTMLPurifier_ChildDef of this tag. * @type HTMLPurifier_ChildDef */ public $child; /** * Abstract string representation of internal ChildDef rules. * @see HTMLPurifier_ContentSets for how this is parsed and then transformed * into an HTMLPurifier_ChildDef. * @warning This is a temporary variable that is not available after * being processed by HTMLDefinition * @type string */ public $content_model; /** * Value of $child->type, used to determine which ChildDef to use, * used in combination with $content_model. * @warning This must be lowercase * @warning This is a temporary variable that is not available after * being processed by HTMLDefinition * @type string */ public $content_model_type; /** * Does the element have a content model (#PCDATA | Inline)*? This * is important for chameleon ins and del processing in * HTMLPurifier_ChildDef_Chameleon. Dynamically set: modules don't * have to worry about this one. * @type bool */ public $descendants_are_inline = false; /** * List of the names of required attributes this element has. * Dynamically populated by HTMLPurifier_HTMLDefinition::getElement() * @type array */ public $required_attr = array(); /** * Lookup table of tags excluded from all descendants of this tag. * @type array * @note SGML permits exclusions for all descendants, but this is * not possible with DTDs or XML Schemas. W3C has elected to * use complicated compositions of content_models to simulate * exclusion for children, but we go the simpler, SGML-style * route of flat-out exclusions, which correctly apply to * all descendants and not just children. Note that the XHTML * Modularization Abstract Modules are blithely unaware of such * distinctions. */ public $excludes = array(); /** * This tag is explicitly auto-closed by the following tags. * @type array */ public $autoclose = array(); /** * If a foreign element is found in this element, test if it is * allowed by this sub-element; if it is, instead of closing the * current element, place it inside this element. * @type string */ public $wrap; /** * Whether or not this is a formatting element affected by the * "Active Formatting Elements" algorithm. * @type bool */ public $formatting; /** * Low-level factory constructor for creating new standalone element defs */ public static function create($content_model, $content_model_type, $attr) { $def = new HTMLPurifier_ElementDef(); $def->content_model = $content_model; $def->content_model_type = $content_model_type; $def->attr = $attr; return $def; } /** * Merges the values of another element definition into this one. * Values from the new element def take precedence if a value is * not mergeable. * @param HTMLPurifier_ElementDef $def */ public function mergeIn($def) { // later keys takes precedence foreach ($def->attr as $k => $v) { if ($k === 0) { // merge in the includes // sorry, no way to override an include foreach ($v as $v2) { $this->attr[0][] = $v2; } continue; } if ($v === false) { if (isset($this->attr[$k])) { unset($this->attr[$k]); } continue; } $this->attr[$k] = $v; } $this->_mergeAssocArray($this->excludes, $def->excludes); $this->attr_transform_pre = array_merge($this->attr_transform_pre, $def->attr_transform_pre); $this->attr_transform_post = array_merge($this->attr_transform_post, $def->attr_transform_post); if (!empty($def->content_model)) { $this->content_model = str_replace("#SUPER", $this->content_model, $def->content_model); $this->child = false; } if (!empty($def->content_model_type)) { $this->content_model_type = $def->content_model_type; $this->child = false; } if (!is_null($def->child)) { $this->child = $def->child; } if (!is_null($def->formatting)) { $this->formatting = $def->formatting; } if ($def->descendants_are_inline) { $this->descendants_are_inline = $def->descendants_are_inline; } } /** * Merges one array into another, removes values which equal false * @param $a1 Array by reference that is merged into * @param $a2 Array that merges into $a1 */ private function _mergeAssocArray(&$a1, $a2) { foreach ($a2 as $k => $v) { if ($v === false) { if (isset($a1[$k])) { unset($a1[$k]); } continue; } $a1[$k] = $v; } } } // vim: et sw=4 sts=4
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