4 * Validates a number as defined by the CSS spec.
6 class HTMLPurifier_AttrDef_CSS_Number
extends HTMLPurifier_AttrDef
10 * Bool indicating whether or not only positive values allowed.
12 protected $non_negative = false;
15 * @param $non_negative Bool indicating whether negatives are forbidden
17 public function __construct($non_negative = false) {
18 $this->non_negative
= $non_negative;
22 * @warning Some contexts do not pass $config, $context. These
23 * variables should not be used without checking HTMLPurifier_Length
25 public function validate($number, $config, $context) {
27 $number = $this->parseCDATA($number);
29 if ($number === '') return false;
30 if ($number === '0') return '0';
35 if ($this->non_negative
) return false;
38 $number = substr($number, 1);
41 if (ctype_digit($number)) {
42 $number = ltrim($number, '0');
43 return $number ?
$sign . $number : '0';
46 // Period is the only non-numeric character allowed
47 if (strpos($number, '.') === false) return false;
49 list($left, $right) = explode('.', $number, 2);
51 if ($left === '' && $right === '') return false;
52 if ($left !== '' && !ctype_digit($left)) return false;
54 $left = ltrim($left, '0');
55 $right = rtrim($right, '0');
58 return $left ?
$sign . $left : '0';
59 } elseif (!ctype_digit($right)) {
63 return $sign . $left . '.' . $right;