| 1 |
efrain |
1 |
<?php
|
|
|
2 |
|
|
|
3 |
/**
|
|
|
4 |
* Validates contents based on NMTOKENS attribute type.
|
|
|
5 |
*/
|
|
|
6 |
class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
|
|
|
7 |
{
|
|
|
8 |
|
|
|
9 |
/**
|
|
|
10 |
* @param string $string
|
|
|
11 |
* @param HTMLPurifier_Config $config
|
|
|
12 |
* @param HTMLPurifier_Context $context
|
|
|
13 |
* @return bool|string
|
|
|
14 |
*/
|
|
|
15 |
public function validate($string, $config, $context)
|
|
|
16 |
{
|
|
|
17 |
$string = trim($string);
|
|
|
18 |
|
|
|
19 |
// early abort: '' and '0' (strings that convert to false) are invalid
|
|
|
20 |
if (!$string) {
|
|
|
21 |
return false;
|
|
|
22 |
}
|
|
|
23 |
|
|
|
24 |
$tokens = $this->split($string, $config, $context);
|
|
|
25 |
$tokens = $this->filter($tokens, $config, $context);
|
|
|
26 |
if (empty($tokens)) {
|
|
|
27 |
return false;
|
|
|
28 |
}
|
|
|
29 |
return implode(' ', $tokens);
|
|
|
30 |
}
|
|
|
31 |
|
|
|
32 |
/**
|
|
|
33 |
* Splits a space separated list of tokens into its constituent parts.
|
|
|
34 |
* @param string $string
|
|
|
35 |
* @param HTMLPurifier_Config $config
|
|
|
36 |
* @param HTMLPurifier_Context $context
|
|
|
37 |
* @return array
|
|
|
38 |
*/
|
|
|
39 |
protected function split($string, $config, $context)
|
|
|
40 |
{
|
|
|
41 |
// OPTIMIZABLE!
|
|
|
42 |
// do the preg_match, capture all subpatterns for reformulation
|
|
|
43 |
|
|
|
44 |
// we don't support U+00A1 and up codepoints or
|
|
|
45 |
// escaping because I don't know how to do that with regexps
|
|
|
46 |
// and plus it would complicate optimization efforts (you never
|
|
|
47 |
// see that anyway).
|
|
|
48 |
$pattern = '/(?:(?<=\s)|\A)' . // look behind for space or string start
|
|
|
49 |
'((?:--|-?[A-Za-z_])[A-Za-z_\-0-9]*)' .
|
|
|
50 |
'(?:(?=\s)|\z)/'; // look ahead for space or string end
|
|
|
51 |
preg_match_all($pattern, $string, $matches);
|
|
|
52 |
return $matches[1];
|
|
|
53 |
}
|
|
|
54 |
|
|
|
55 |
/**
|
|
|
56 |
* Template method for removing certain tokens based on arbitrary criteria.
|
|
|
57 |
* @note If we wanted to be really functional, we'd do an array_filter
|
|
|
58 |
* with a callback. But... we're not.
|
|
|
59 |
* @param array $tokens
|
|
|
60 |
* @param HTMLPurifier_Config $config
|
|
|
61 |
* @param HTMLPurifier_Context $context
|
|
|
62 |
* @return array
|
|
|
63 |
*/
|
|
|
64 |
protected function filter($tokens, $config, $context)
|
|
|
65 |
{
|
|
|
66 |
return $tokens;
|
|
|
67 |
}
|
|
|
68 |
}
|
|
|
69 |
|
|
|
70 |
// vim: et sw=4 sts=4
|