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   1  <?php
   2  
   3  /**
   4   * Validates an integer.
   5   * @note While this class was modeled off the CSS definition, no currently
   6   *       allowed CSS uses this type.  The properties that do are: widows,
   7   *       orphans, z-index, counter-increment, counter-reset.  Some of the
   8   *       HTML attributes, however, find use for a non-negative version of this.
   9   */
  10  class HTMLPurifier_AttrDef_Integer extends HTMLPurifier_AttrDef
  11  {
  12  
  13      /**
  14       * Bool indicating whether or not negative values are allowed
  15       */
  16      protected $negative = true;
  17  
  18      /**
  19       * Bool indicating whether or not zero is allowed
  20       */
  21      protected $zero = true;
  22  
  23      /**
  24       * Bool indicating whether or not positive values are allowed
  25       */
  26      protected $positive = true;
  27  
  28      /**
  29       * @param $negative Bool indicating whether or not negative values are allowed
  30       * @param $zero Bool indicating whether or not zero is allowed
  31       * @param $positive Bool indicating whether or not positive values are allowed
  32       */
  33      public function __construct(
  34          $negative = true, $zero = true, $positive = true
  35      ) {
  36          $this->negative = $negative;
  37          $this->zero     = $zero;
  38          $this->positive = $positive;
  39      }
  40  
  41      public function validate($integer, $config, $context) {
  42  
  43          $integer = $this->parseCDATA($integer);
  44          if ($integer === '') return false;
  45  
  46          // we could possibly simply typecast it to integer, but there are
  47          // certain fringe cases that must not return an integer.
  48  
  49          // clip leading sign
  50          if ( $this->negative && $integer[0] === '-' ) {
  51              $digits = substr($integer, 1);
  52              if ($digits === '0') $integer = '0'; // rm minus sign for zero
  53          } elseif( $this->positive && $integer[0] === '+' ) {
  54              $digits = $integer = substr($integer, 1); // rm unnecessary plus
  55          } else {
  56              $digits = $integer;
  57          }
  58  
  59          // test if it's numeric
  60          if (!ctype_digit($digits)) return false;
  61  
  62          // perform scope tests
  63          if (!$this->zero     && $integer == 0) return false;
  64          if (!$this->positive && $integer > 0) return false;
  65          if (!$this->negative && $integer < 0) return false;
  66  
  67          return $integer;
  68  
  69      }
  70  
  71  }
  72  
  73  // vim: et sw=4 sts=4