<?php
/**
* Performs safe variable parsing based on types which can be used by
* users. This may not be able to represent all possible data inputs,
* however.
*/
class HTMLPurifier_VarParser_Flexible extends HTMLPurifier_VarParser
{
/**
* @param mixed $var
* @param int $type
* @param bool $allow_null
* @return array|bool|float|int|mixed|null|string
* @throws HTMLPurifier_VarParserException
*/
protected function parseImplementation($var, $type, $allow_null)
{
if ($allow_null && $var === null) {
return null;
}
switch ($type) {
// Note: if code "breaks" from the switch, it triggers a generic
// exception to be thrown. Specific errors can be specifically
// done here.
case self::MIXED:
case self::ISTRING:
case self::STRING:
case self::TEXT:
case self::ITEXT:
return $var;
case self::INT:
if (is_string($var) && ctype_digit($var)) {
$var = (int)$var;
}
return $var;
case self::FLOAT:
if ((is_string($var) && is_numeric($var)) || is_int($var)) {
$var = (float)$var;
}
return $var;
case self::BOOL:
if (is_int($var) && ($var === 0 || $var === 1)) {
$var = (bool)$var;
} elseif (is_string($var)) {
if ($var == 'on' || $var == 'true' || $var == '1') {
$var = true;
} elseif ($var == 'off' || $var == 'false' || $var == '0') {
$var = false;
} else {
throw new HTMLPurifier_VarParserException("Unrecognized value '$var' for $type");
}
}
return $var;
case self::ALIST:
case self::HASH:
case self::LOOKUP:
if (is_string($var)) {
// special case: technically, this is an array with
// a single empty string item, but having an empty
// array is more intuitive
if ($var == '') {
return array();
}
if (strpos($var, "\n") === false && strpos($var, "\r") === false) {
// simplistic string to array method that only works
// for simple lists of tag names or alphanumeric characters
$var = explode(',', $var);
} else {
$var = preg_split('/(,|[\n\r]+)/', $var);
}
// remove spaces
foreach ($var as $i => $j) {
$var[$i] = trim($j);
}
if ($type === self::HASH) {
// key:value,key2:value2
$nvar = array();
foreach ($var as $keypair) {
$c = explode(':', $keypair, 2);
if (!isset($c[1])) {
continue;
}
$nvar[trim($c[0])] = trim($c[1]);
}
$var = $nvar;
}
}
if (!is_array($var)) {
break;
}
$keys = array_keys($var);
if ($keys === array_keys($keys)) {
if ($type == self::ALIST) {
return $var;
} elseif ($type == self::LOOKUP) {
$new = array();
foreach ($var as $key) {
$new[$key] = true;
}
return $new;
} else {
break;
}
}
if ($type === self::ALIST) {
trigger_error("Array list did not have consecutive integer indexes", E_USER_WARNING);
return array_values($var);
}
if ($type === self::LOOKUP) {
foreach ($var as $key => $value) {
if ($value !== true) {
trigger_error(
"Lookup array has non-true value at key '$key'; " .
"maybe your input array was not indexed numerically",
E_USER_WARNING
);
}
$var[$key] = true;
}
}
return $var;
default:
$this->errorInconsistent(__CLASS__, $type);
}
$this->errorGeneric($var, $type);
}
}
// vim: et sw=4 sts=4