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Commit | Line | Data |
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010efc9b AD |
1 | <?php |
2 | ||
3 | /** | |
4 | * Validates a number as defined by the CSS spec. | |
5 | */ | |
6 | class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef | |
7 | { | |
8 | ||
9 | /** | |
10 | * Bool indicating whether or not only positive values allowed. | |
11 | */ | |
12 | protected $non_negative = false; | |
13 | ||
14 | /** | |
15 | * @param $non_negative Bool indicating whether negatives are forbidden | |
16 | */ | |
17 | public function __construct($non_negative = false) { | |
18 | $this->non_negative = $non_negative; | |
19 | } | |
20 | ||
21 | /** | |
22 | * @warning Some contexts do not pass $config, $context. These | |
23 | * variables should not be used without checking HTMLPurifier_Length | |
24 | */ | |
25 | public function validate($number, $config, $context) { | |
26 | ||
27 | $number = $this->parseCDATA($number); | |
28 | ||
29 | if ($number === '') return false; | |
30 | if ($number === '0') return '0'; | |
31 | ||
32 | $sign = ''; | |
33 | switch ($number[0]) { | |
34 | case '-': | |
35 | if ($this->non_negative) return false; | |
36 | $sign = '-'; | |
37 | case '+': | |
38 | $number = substr($number, 1); | |
39 | } | |
40 | ||
41 | if (ctype_digit($number)) { | |
42 | $number = ltrim($number, '0'); | |
43 | return $number ? $sign . $number : '0'; | |
44 | } | |
45 | ||
46 | // Period is the only non-numeric character allowed | |
47 | if (strpos($number, '.') === false) return false; | |
48 | ||
49 | list($left, $right) = explode('.', $number, 2); | |
50 | ||
51 | if ($left === '' && $right === '') return false; | |
52 | if ($left !== '' && !ctype_digit($left)) return false; | |
53 | ||
54 | $left = ltrim($left, '0'); | |
55 | $right = rtrim($right, '0'); | |
56 | ||
57 | if ($right === '') { | |
58 | return $left ? $sign . $left : '0'; | |
59 | } elseif (!ctype_digit($right)) { | |
60 | return false; | |
61 | } | |
62 | ||
63 | return $sign . $left . '.' . $right; | |
64 | ||
65 | } | |
66 | ||
67 | } | |
68 | ||
69 | // vim: et sw=4 sts=4 |