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<?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

* @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

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