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/plugins/vjCommentPlugin/lib/tools/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php

https://bitbucket.org/Kudlaty/360kdw
PHP | 90 lines | 51 code | 12 blank | 27 comment | 6 complexity | 13c44a1aaf1ab1b25744758cd1831b4f MD5 | raw file
 1<?php
 2
 3/**
 4 * Custom validation class, accepts DTD child definitions
 5 *
 6 * @warning Currently this class is an all or nothing proposition, that is,
 7 *          it will only give a bool return value.
 8 */
 9class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
10{
11    public $type = 'custom';
12    public $allow_empty = false;
13    /**
14     * Allowed child pattern as defined by the DTD
15     */
16    public $dtd_regex;
17    /**
18     * PCRE regex derived from $dtd_regex
19     * @private
20     */
21    private $_pcre_regex;
22    /**
23     * @param $dtd_regex Allowed child pattern from the DTD
24     */
25    public function __construct($dtd_regex) {
26        $this->dtd_regex = $dtd_regex;
27        $this->_compileRegex();
28    }
29    /**
30     * Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
31     */
32    protected function _compileRegex() {
33        $raw = str_replace(' ', '', $this->dtd_regex);
34        if ($raw{0} != '(') {
35            $raw = "($raw)";
36        }
37        $el = '[#a-zA-Z0-9_.-]+';
38        $reg = $raw;
39
40        // COMPLICATED! AND MIGHT BE BUGGY! I HAVE NO CLUE WHAT I'M
41        // DOING! Seriously: if there's problems, please report them.
42
43        // collect all elements into the $elements array
44        preg_match_all("/$el/", $reg, $matches);
45        foreach ($matches[0] as $match) {
46            $this->elements[$match] = true;
47        }
48
49        // setup all elements as parentheticals with leading commas
50        $reg = preg_replace("/$el/", '(,\\0)', $reg);
51
52        // remove commas when they were not solicited
53        $reg = preg_replace("/([^,(|]\(+),/", '\\1', $reg);
54
55        // remove all non-paranthetical commas: they are handled by first regex
56        $reg = preg_replace("/,\(/", '(', $reg);
57
58        $this->_pcre_regex = $reg;
59    }
60    public function validateChildren($tokens_of_children, $config, $context) {
61        $list_of_children = '';
62        $nesting = 0; // depth into the nest
63        foreach ($tokens_of_children as $token) {
64            if (!empty($token->is_whitespace)) continue;
65
66            $is_child = ($nesting == 0); // direct
67
68            if ($token instanceof HTMLPurifier_Token_Start) {
69                $nesting++;
70            } elseif ($token instanceof HTMLPurifier_Token_End) {
71                $nesting--;
72            }
73
74            if ($is_child) {
75                $list_of_children .= $token->name . ',';
76            }
77        }
78        // add leading comma to deal with stray comma declarations
79        $list_of_children = ',' . rtrim($list_of_children, ',');
80        $okay =
81            preg_match(
82                '/^,?'.$this->_pcre_regex.'$/',
83                $list_of_children
84            );
85
86        return (bool) $okay;
87    }
88}
89
90// vim: et sw=4 sts=4