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   1  <?php
   2  
   3  /**
   4   * Performs safe variable parsing based on types which can be used by
   5   * users. This may not be able to represent all possible data inputs,
   6   * however.
   7   */
   8  class HTMLPurifier_VarParser_Flexible extends HTMLPurifier_VarParser
   9  {
  10  
  11      protected function parseImplementation($var, $type, $allow_null) {
  12          if ($allow_null && $var === null) return null;
  13          switch ($type) {
  14              // Note: if code "breaks" from the switch, it triggers a generic
  15              // exception to be thrown. Specific errors can be specifically
  16              // done here.
  17              case self::MIXED :
  18              case self::ISTRING :
  19              case self::STRING :
  20              case self::TEXT :
  21              case self::ITEXT :
  22                  return $var;
  23              case self::INT :
  24                  if (is_string($var) && ctype_digit($var)) $var = (int) $var;
  25                  return $var;
  26              case self::FLOAT :
  27                  if ((is_string($var) && is_numeric($var)) || is_int($var)) $var = (float) $var;
  28                  return $var;
  29              case self::BOOL :
  30                  if (is_int($var) && ($var === 0 || $var === 1)) {
  31                      $var = (bool) $var;
  32                  } elseif (is_string($var)) {
  33                      if ($var == 'on' || $var == 'true' || $var == '1') {
  34                          $var = true;
  35                      } elseif ($var == 'off' || $var == 'false' || $var == '0') {
  36                          $var = false;
  37                      } else {
  38                          throw new HTMLPurifier_VarParserException("Unrecognized value '$var' for $type");
  39                      }
  40                  }
  41                  return $var;
  42              case self::ALIST :
  43              case self::HASH :
  44              case self::LOOKUP :
  45                  if (is_string($var)) {
  46                      // special case: technically, this is an array with
  47                      // a single empty string item, but having an empty
  48                      // array is more intuitive
  49                      if ($var == '') return array();
  50                      if (strpos($var, "\n") === false && strpos($var, "\r") === false) {
  51                          // simplistic string to array method that only works
  52                          // for simple lists of tag names or alphanumeric characters
  53                          $var = explode(',',$var);
  54                      } else {
  55                          $var = preg_split('/(,|[\n\r]+)/', $var);
  56                      }
  57                      // remove spaces
  58                      foreach ($var as $i => $j) $var[$i] = trim($j);
  59                      if ($type === self::HASH) {
  60                          // key:value,key2:value2
  61                          $nvar = array();
  62                          foreach ($var as $keypair) {
  63                              $c = explode(':', $keypair, 2);
  64                              if (!isset($c[1])) continue;
  65                              $nvar[$c[0]] = $c[1];
  66                          }
  67                          $var = $nvar;
  68                      }
  69                  }
  70                  if (!is_array($var)) break;
  71                  $keys = array_keys($var);
  72                  if ($keys === array_keys($keys)) {
  73                      if ($type == self::ALIST) return $var;
  74                      elseif ($type == self::LOOKUP) {
  75                          $new = array();
  76                          foreach ($var as $key) {
  77                              $new[$key] = true;
  78                          }
  79                          return $new;
  80                      } else break;
  81                  }
  82                  if ($type === self::LOOKUP) {
  83                      foreach ($var as $key => $value) {
  84                          $var[$key] = true;
  85                      }
  86                  }
  87                  return $var;
  88              default:
  89                  $this->errorInconsistent(__CLASS__, $type);
  90          }
  91          $this->errorGeneric($var, $type);
  92      }
  93  
  94  }
  95  
  96  // vim: et sw=4 sts=4