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   1  <?php
   2  
   3  /**
   4   * Validates a MultiLength as defined by the HTML spec.
   5   *
   6   * A multilength is either a integer (pixel count), a percentage, or
   7   * a relative number.
   8   */
   9  class HTMLPurifier_AttrDef_HTML_MultiLength extends HTMLPurifier_AttrDef_HTML_Length
  10  {
  11  
  12      /**
  13       * @param string $string
  14       * @param HTMLPurifier_Config $config
  15       * @param HTMLPurifier_Context $context
  16       * @return bool|string
  17       */
  18      public function validate($string, $config, $context)
  19      {
  20          $string = trim($string);
  21          if ($string === '') {
  22              return false;
  23          }
  24  
  25          $parent_result = parent::validate($string, $config, $context);
  26          if ($parent_result !== false) {
  27              return $parent_result;
  28          }
  29  
  30          $length = strlen($string);
  31          $last_char = $string[$length - 1];
  32  
  33          if ($last_char !== '*') {
  34              return false;
  35          }
  36  
  37          $int = substr($string, 0, $length - 1);
  38  
  39          if ($int == '') {
  40              return '*';
  41          }
  42          if (!is_numeric($int)) {
  43              return false;
  44          }
  45  
  46          $int = (int)$int;
  47          if ($int < 0) {
  48              return false;
  49          }
  50          if ($int == 0) {
  51              return '0';
  52          }
  53          if ($int == 1) {
  54              return '*';
  55          }
  56          return ((string)$int) . '*';
  57      }
  58  }
  59  
  60  // vim: et sw=4 sts=4