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118 lines
3.3 KiB
118 lines
3.3 KiB
<?php
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/**
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* Definition that allows a set of elements, but disallows empty children.
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*/
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class HTMLPurifier_ChildDef_Required extends HTMLPurifier_ChildDef
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{
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/**
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* Lookup table of allowed elements.
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* @type array
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*/
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public $elements = array();
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/**
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* Whether or not the last passed node was all whitespace.
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* @type bool
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*/
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protected $whitespace = false;
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/**
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* @param array|string $elements List of allowed element names (lowercase).
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*/
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public function __construct($elements)
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{
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if (is_string($elements)) {
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$elements = str_replace(' ', '', $elements);
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$elements = explode('|', $elements);
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}
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$keys = array_keys($elements);
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if ($keys == array_keys($keys)) {
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$elements = array_flip($elements);
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foreach ($elements as $i => $x) {
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$elements[$i] = true;
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if (empty($i)) {
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unset($elements[$i]);
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} // remove blank
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}
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}
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$this->elements = $elements;
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}
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/**
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* @type bool
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*/
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public $allow_empty = false;
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/**
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* @type string
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*/
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public $type = 'required';
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/**
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* @param array $children
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return array
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*/
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public function validateChildren($children, $config, $context)
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{
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// Flag for subclasses
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$this->whitespace = false;
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// if there are no tokens, delete parent node
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if (empty($children)) {
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return false;
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}
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// the new set of children
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$result = array();
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// whether or not parsed character data is allowed
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// this controls whether or not we silently drop a tag
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// or generate escaped HTML from it
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$pcdata_allowed = isset($this->elements['#PCDATA']);
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// a little sanity check to make sure it's not ALL whitespace
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$all_whitespace = true;
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$stack = array_reverse($children);
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while (!empty($stack)) {
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$node = array_pop($stack);
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if (!empty($node->is_whitespace)) {
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$result[] = $node;
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continue;
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}
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$all_whitespace = false; // phew, we're not talking about whitespace
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if (!isset($this->elements[$node->name])) {
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// special case text
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// XXX One of these ought to be redundant or something
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if ($pcdata_allowed && $node instanceof HTMLPurifier_Node_Text) {
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$result[] = $node;
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continue;
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}
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// spill the child contents in
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// ToDo: Make configurable
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if ($node instanceof HTMLPurifier_Node_Element) {
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for ($i = count($node->children) - 1; $i >= 0; $i--) {
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$stack[] = $node->children[$i];
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}
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continue;
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}
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continue;
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}
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$result[] = $node;
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}
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if (empty($result)) {
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return false;
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}
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if ($all_whitespace) {
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$this->whitespace = true;
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return false;
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}
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return $result;
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}
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}
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// vim: et sw=4 sts=4
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