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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: */
9: class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
10: {
11: /**
12: * @type string
13: */
14: public $type = 'custom';
15:
16: /**
17: * @type bool
18: */
19: public $allow_empty = false;
20:
21: /**
22: * Allowed child pattern as defined by the DTD.
23: * @type string
24: */
25: public $dtd_regex;
26:
27: /**
28: * PCRE regex derived from $dtd_regex.
29: * @type string
30: */
31: private $_pcre_regex;
32:
33: /**
34: * @param $dtd_regex Allowed child pattern from the DTD
35: */
36: public function __construct($dtd_regex)
37: {
38: $this->dtd_regex = $dtd_regex;
39: $this->_compileRegex();
40: }
41:
42: /**
43: * Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
44: */
45: protected function _compileRegex()
46: {
47: $raw = str_replace(' ', '', $this->dtd_regex);
48: if ($raw[0] != '(') {
49: $raw = "($raw)";
50: }
51: $el = '[#a-zA-Z0-9_.-]+';
52: $reg = $raw;
53:
54: // COMPLICATED! AND MIGHT BE BUGGY! I HAVE NO CLUE WHAT I'M
55: // DOING! Seriously: if there's problems, please report them.
56:
57: // collect all elements into the $elements array
58: preg_match_all("/$el/", $reg, $matches);
59: foreach ($matches[0] as $match) {
60: $this->elements[$match] = true;
61: }
62:
63: // setup all elements as parentheticals with leading commas
64: $reg = preg_replace("/$el/", '(,\\0)', $reg);
65:
66: // remove commas when they were not solicited
67: $reg = preg_replace("/([^,(|]\(+),/", '\\1', $reg);
68:
69: // remove all non-paranthetical commas: they are handled by first regex
70: $reg = preg_replace("/,\(/", '(', $reg);
71:
72: $this->_pcre_regex = $reg;
73: }
74:
75: /**
76: * @param HTMLPurifier_Node[] $children
77: * @param HTMLPurifier_Config $config
78: * @param HTMLPurifier_Context $context
79: * @return bool
80: */
81: public function validateChildren($children, $config, $context)
82: {
83: $list_of_children = '';
84: $nesting = 0; // depth into the nest
85: foreach ($children as $node) {
86: if (!empty($node->is_whitespace)) {
87: continue;
88: }
89: $list_of_children .= $node->name . ',';
90: }
91: // add leading comma to deal with stray comma declarations
92: $list_of_children = ',' . rtrim($list_of_children, ',');
93: $okay =
94: preg_match(
95: '/^,?' . $this->_pcre_regex . '$/',
96: $list_of_children
97: );
98: return (bool)$okay;
99: }
100: }
101:
102: // vim: et sw=4 sts=4
103:
API documentation generated by ApiGen v7.0.0-alpha.6