[Summary view] [Print] [Text view]

   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       * Indicates whether or not only positive values are allowed.
  11       * @type bool
  12       */
  13      protected $non_negative = false;
  14  
  15      /**
  16       * @param bool $non_negative indicates whether negatives are forbidden
  17       */
  18      public function __construct($non_negative = false)
  19      {
  20          $this->non_negative = $non_negative;
  21      }
  22  
  23      /**
  24       * @param string $number
  25       * @param HTMLPurifier_Config $config
  26       * @param HTMLPurifier_Context $context
  27       * @return string|bool
  28       * @warning Some contexts do not pass $config, $context. These
  29       *          variables should not be used without checking HTMLPurifier_Length
  30       */
  31      public function validate($number, $config, $context)
  32      {
  33          $number = $this->parseCDATA($number);
  34  
  35          if ($number === '') {
  36              return false;
  37          }
  38          if ($number === '0') {
  39              return '0';
  40          }
  41  
  42          $sign = '';
  43          switch ($number[0]) {
  44              case '-':
  45                  if ($this->non_negative) {
  46                      return false;
  47                  }
  48                  $sign = '-';
  49              case '+':
  50                  $number = substr($number, 1);
  51          }
  52  
  53          if (ctype_digit($number)) {
  54              $number = ltrim($number, '0');
  55              return $number ? $sign . $number : '0';
  56          }
  57  
  58          // Period is the only non-numeric character allowed
  59          if (strpos($number, '.') === false) {
  60              return false;
  61          }
  62  
  63          list($left, $right) = explode('.', $number, 2);
  64  
  65          if ($left === '' && $right === '') {
  66              return false;
  67          }
  68          if ($left !== '' && !ctype_digit($left)) {
  69              return false;
  70          }
  71  
  72          $left = ltrim($left, '0');
  73          $right = rtrim($right, '0');
  74  
  75          if ($right === '') {
  76              return $left ? $sign . $left : '0';
  77          } elseif (!ctype_digit($right)) {
  78              return false;
  79          }
  80          return $sign . $left . '.' . $right;
  81      }
  82  }
  83  
  84  // vim: et sw=4 sts=4