<?php
/**
* Smarty plugin
*
* @package Smarty
* @subpackage PluginsShared
*/
/**
* evaluate compiler parameter
*
* @param array $params parameter array as given to the compiler function
* @param integer $index array index of the parameter to convert
* @param mixed $default value to be returned if the parameter is not present
* @return mixed evaluated value of parameter or $default
* @throws SmartyException if parameter is not a literal (but an expression, variable, …)
* @author Rodney Rehm
*/
function smarty_literal_compiler_param($params, $index, $default=null)
{
// not set, go default
if (!isset($params[$index])) {
return $default;
}
// test if param is a literal
if (!preg_match('/^([\'"]?)[a-zA-Z0-9]+(\\1)$/', $params[$index])) {
throw new SmartyException('$param[' . $index . '] is not a literal and is thus not evaluatable at compile time');
}
$t = null;
eval("\$t = " . $params[$index] . ";");
return $t;
}
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