mirror of https://github.com/friendica/friendica
91 lines
2.7 KiB
PHP
91 lines
2.7 KiB
PHP
<?php
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/**
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* Custom validation class, accepts DTD child definitions
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*
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* @warning Currently this class is an all or nothing proposition, that is,
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* it will only give a bool return value.
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*/
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class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
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{
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public $type = 'custom';
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public $allow_empty = false;
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/**
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* Allowed child pattern as defined by the DTD
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*/
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public $dtd_regex;
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/**
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* PCRE regex derived from $dtd_regex
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* @private
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*/
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private $_pcre_regex;
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/**
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* @param $dtd_regex Allowed child pattern from the DTD
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*/
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public function __construct($dtd_regex) {
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$this->dtd_regex = $dtd_regex;
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$this->_compileRegex();
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}
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/**
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* Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
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*/
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protected function _compileRegex() {
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$raw = str_replace(' ', '', $this->dtd_regex);
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if ($raw{0} != '(') {
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$raw = "($raw)";
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}
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$el = '[#a-zA-Z0-9_.-]+';
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$reg = $raw;
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// COMPLICATED! AND MIGHT BE BUGGY! I HAVE NO CLUE WHAT I'M
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// DOING! Seriously: if there's problems, please report them.
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// collect all elements into the $elements array
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preg_match_all("/$el/", $reg, $matches);
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foreach ($matches[0] as $match) {
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$this->elements[$match] = true;
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}
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// setup all elements as parentheticals with leading commas
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$reg = preg_replace("/$el/", '(,\\0)', $reg);
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// remove commas when they were not solicited
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$reg = preg_replace("/([^,(|]\(+),/", '\\1', $reg);
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// remove all non-paranthetical commas: they are handled by first regex
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$reg = preg_replace("/,\(/", '(', $reg);
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$this->_pcre_regex = $reg;
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}
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public function validateChildren($tokens_of_children, $config, $context) {
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$list_of_children = '';
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$nesting = 0; // depth into the nest
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foreach ($tokens_of_children as $token) {
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if (!empty($token->is_whitespace)) continue;
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$is_child = ($nesting == 0); // direct
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if ($token instanceof HTMLPurifier_Token_Start) {
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$nesting++;
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} elseif ($token instanceof HTMLPurifier_Token_End) {
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$nesting--;
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}
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if ($is_child) {
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$list_of_children .= $token->name . ',';
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}
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}
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// add leading comma to deal with stray comma declarations
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$list_of_children = ',' . rtrim($list_of_children, ',');
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$okay =
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preg_match(
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'/^,?'.$this->_pcre_regex.'$/',
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$list_of_children
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);
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return (bool) $okay;
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}
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}
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// vim: et sw=4 sts=4
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