4 * Validates a number as defined by the CSS spec.
6 class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
10 * Indicates whether or not only positive values are allowed.
13 protected $non_negative = false;
16 * @param bool $non_negative indicates whether negatives are forbidden
18 public function __construct($non_negative = false)
20 $this->non_negative = $non_negative;
24 * @param string $number
25 * @param HTMLPurifier_Config $config
26 * @param HTMLPurifier_Context $context
28 * @warning Some contexts do not pass $config, $context. These
29 * variables should not be used without checking HTMLPurifier_Length
31 public function validate($number, $config, $context)
33 $number = $this->parseCDATA($number);
38 if ($number === '0') {
45 if ($this->non_negative) {
50 $number = substr($number, 1);
53 if (ctype_digit($number)) {
54 $number = ltrim($number, '0');
55 return $number ? $sign . $number : '0';
58 // Period is the only non-numeric character allowed
59 if (strpos($number, '.') === false) {
63 list($left, $right) = explode('.', $number, 2);
65 if ($left === '' && $right === '') {
68 if ($left !== '' && !ctype_digit($left)) {
72 $left = ltrim($left, '0');
73 $right = rtrim($right, '0');
76 return $left ? $sign . $left : '0';
77 } elseif (!ctype_digit($right)) {
80 return $sign . $left . '.' . $right;