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170 lines
5.7 KiB
PHP
170 lines
5.7 KiB
PHP
<?php
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/**
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* @todo Unit test
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*/
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class HTMLPurifier_ContentSets
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{
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/**
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* List of content set strings (pipe separators) indexed by name.
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* @type array
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*/
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public $info = array();
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/**
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* List of content set lookups (element => true) indexed by name.
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* @type array
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* @note This is in HTMLPurifier_HTMLDefinition->info_content_sets
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*/
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public $lookup = array();
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/**
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* Synchronized list of defined content sets (keys of info).
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* @type array
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*/
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protected $keys = array();
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/**
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* Synchronized list of defined content values (values of info).
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* @type array
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*/
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protected $values = array();
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/**
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* Merges in module's content sets, expands identifiers in the content
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* sets and populates the keys, values and lookup member variables.
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* @param HTMLPurifier_HTMLModule[] $modules List of HTMLPurifier_HTMLModule
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*/
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public function __construct($modules)
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{
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if (!is_array($modules)) {
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$modules = array($modules);
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}
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// populate content_sets based on module hints
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// sorry, no way of overloading
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foreach ($modules as $module) {
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foreach ($module->content_sets as $key => $value) {
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$temp = $this->convertToLookup($value);
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if (isset($this->lookup[$key])) {
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// add it into the existing content set
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$this->lookup[$key] = array_merge($this->lookup[$key], $temp);
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} else {
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$this->lookup[$key] = $temp;
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}
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}
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}
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$old_lookup = false;
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while ($old_lookup !== $this->lookup) {
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$old_lookup = $this->lookup;
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foreach ($this->lookup as $i => $set) {
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$add = array();
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foreach ($set as $element => $x) {
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if (isset($this->lookup[$element])) {
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$add += $this->lookup[$element];
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unset($this->lookup[$i][$element]);
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}
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}
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$this->lookup[$i] += $add;
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}
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}
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foreach ($this->lookup as $key => $lookup) {
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$this->info[$key] = implode(' | ', array_keys($lookup));
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}
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$this->keys = array_keys($this->info);
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$this->values = array_values($this->info);
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}
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/**
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* Accepts a definition; generates and assigns a ChildDef for it
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* @param HTMLPurifier_ElementDef $def HTMLPurifier_ElementDef reference
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* @param HTMLPurifier_HTMLModule $module Module that defined the ElementDef
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*/
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public function generateChildDef(&$def, $module)
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{
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if (!empty($def->child)) { // already done!
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return;
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}
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$content_model = $def->content_model;
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if (is_string($content_model)) {
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// Assume that $this->keys is alphanumeric
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$def->content_model = preg_replace_callback(
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'/\b(' . implode('|', $this->keys) . ')\b/',
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array($this, 'generateChildDefCallback'),
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$content_model
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);
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//$def->content_model = str_replace(
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// $this->keys, $this->values, $content_model);
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}
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$def->child = $this->getChildDef($def, $module);
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}
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public function generateChildDefCallback($matches)
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{
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return $this->info[$matches[0]];
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}
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/**
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* Instantiates a ChildDef based on content_model and content_model_type
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* member variables in HTMLPurifier_ElementDef
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* @note This will also defer to modules for custom HTMLPurifier_ChildDef
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* subclasses that need content set expansion
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* @param HTMLPurifier_ElementDef $def HTMLPurifier_ElementDef to have ChildDef extracted
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* @param HTMLPurifier_HTMLModule $module Module that defined the ElementDef
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* @return HTMLPurifier_ChildDef corresponding to ElementDef
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*/
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public function getChildDef($def, $module)
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{
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$value = $def->content_model;
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if (is_object($value)) {
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trigger_error(
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'Literal object child definitions should be stored in '.
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'ElementDef->child not ElementDef->content_model',
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E_USER_NOTICE
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);
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return $value;
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}
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switch ($def->content_model_type) {
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case 'required':
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return new HTMLPurifier_ChildDef_Required($value);
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case 'optional':
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return new HTMLPurifier_ChildDef_Optional($value);
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case 'empty':
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return new HTMLPurifier_ChildDef_Empty();
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case 'custom':
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return new HTMLPurifier_ChildDef_Custom($value);
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}
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// defer to its module
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$return = false;
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if ($module->defines_child_def) { // save a func call
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$return = $module->getChildDef($def);
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}
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if ($return !== false) {
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return $return;
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}
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// error-out
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trigger_error(
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'Could not determine which ChildDef class to instantiate',
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E_USER_ERROR
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);
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return false;
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}
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/**
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* Converts a string list of elements separated by pipes into
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* a lookup array.
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* @param string $string List of elements
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* @return array Lookup array of elements
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*/
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protected function convertToLookup($string)
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{
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$array = explode('|', str_replace(' ', '', $string));
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$ret = array();
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foreach ($array as $k) {
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$ret[$k] = true;
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}
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return $ret;
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}
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}
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// vim: et sw=4 sts=4
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