File indexing completed on 2024-12-22 05:36:18

 <?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