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-rw-r--r--inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/Lang.php86
1 files changed, 86 insertions, 0 deletions
diff --git a/inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/Lang.php b/inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/Lang.php
new file mode 100644
index 00000000..6ad0f799
--- /dev/null
+++ b/inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/Lang.php
@@ -0,0 +1,86 @@
1<?php
2
3/**
4 * Validates the HTML attribute lang, effectively a language code.
5 * @note Built according to RFC 3066, which obsoleted RFC 1766
6 */
7class HTMLPurifier_AttrDef_Lang extends HTMLPurifier_AttrDef
8{
9
10 /**
11 * @param string $string
12 * @param HTMLPurifier_Config $config
13 * @param HTMLPurifier_Context $context
14 * @return bool|string
15 */
16 public function validate($string, $config, $context)
17 {
18 $string = trim($string);
19 if (!$string) {
20 return false;
21 }
22
23 $subtags = explode('-', $string);
24 $num_subtags = count($subtags);
25
26 if ($num_subtags == 0) { // sanity check
27 return false;
28 }
29
30 // process primary subtag : $subtags[0]
31 $length = strlen($subtags[0]);
32 switch ($length) {
33 case 0:
34 return false;
35 case 1:
36 if (!($subtags[0] == 'x' || $subtags[0] == 'i')) {
37 return false;
38 }
39 break;
40 case 2:
41 case 3:
42 if (!ctype_alpha($subtags[0])) {
43 return false;
44 } elseif (!ctype_lower($subtags[0])) {
45 $subtags[0] = strtolower($subtags[0]);
46 }
47 break;
48 default:
49 return false;
50 }
51
52 $new_string = $subtags[0];
53 if ($num_subtags == 1) {
54 return $new_string;
55 }
56
57 // process second subtag : $subtags[1]
58 $length = strlen($subtags[1]);
59 if ($length == 0 || ($length == 1 && $subtags[1] != 'x') || $length > 8 || !ctype_alnum($subtags[1])) {
60 return $new_string;
61 }
62 if (!ctype_lower($subtags[1])) {
63 $subtags[1] = strtolower($subtags[1]);
64 }
65
66 $new_string .= '-' . $subtags[1];
67 if ($num_subtags == 2) {
68 return $new_string;
69 }
70
71 // process all other subtags, index 2 and up
72 for ($i = 2; $i < $num_subtags; $i++) {
73 $length = strlen($subtags[$i]);
74 if ($length == 0 || $length > 8 || !ctype_alnum($subtags[$i])) {
75 return $new_string;
76 }
77 if (!ctype_lower($subtags[$i])) {
78 $subtags[$i] = strtolower($subtags[$i]);
79 }
80 $new_string .= '-' . $subtags[$i];
81 }
82 return $new_string;
83 }
84}
85
86// vim: et sw=4 sts=4