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- <?php
-
- /**
- * Validates a number as defined by the CSS spec.
- */
- class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
- {
-
- /**
- * Indicates whether or not only positive values are allowed.
- * @type bool
- */
- protected $non_negative = false;
-
- /**
- * @param bool $non_negative indicates whether negatives are forbidden
- */
- public function __construct($non_negative = false)
- {
- $this->non_negative = $non_negative;
- }
-
- /**
- * @param string $number
- * @param HTMLPurifier_Config $config
- * @param HTMLPurifier_Context $context
- * @return string|bool
- * @warning Some contexts do not pass $config, $context. These
- * variables should not be used without checking HTMLPurifier_Length
- */
- public function validate($number, $config, $context)
- {
- $number = $this->parseCDATA($number);
-
- if ($number === '') {
- return false;
- }
- if ($number === '0') {
- return '0';
- }
-
- $sign = '';
- switch ($number[0]) {
- case '-':
- if ($this->non_negative) {
- return false;
- }
- $sign = '-';
- case '+':
- $number = substr($number, 1);
- }
-
- if (ctype_digit($number)) {
- $number = ltrim($number, '0');
- return $number ? $sign . $number : '0';
- }
-
- // Period is the only non-numeric character allowed
- if (strpos($number, '.') === false) {
- return false;
- }
-
- list($left, $right) = explode('.', $number, 2);
-
- if ($left === '' && $right === '') {
- return false;
- }
- if ($left !== '' && !ctype_digit($left)) {
- return false;
- }
-
- $left = ltrim($left, '0');
- $right = rtrim($right, '0');
-
- if ($right === '') {
- return $left ? $sign . $left : '0';
- } elseif (!ctype_digit($right)) {
- return false;
- }
- return $sign . $left . '.' . $right;
- }
- }
-
- // vim: et sw=4 sts=4
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