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<?php
/**
* Smarty Method RegisterFilter
*
* Smarty::registerFilter() method
*
* @package Smarty
* @subpackage PluginsInternal
* @author Uwe Tews
*/
class Smarty_Internal_Method_RegisterFilter
{
/**
* Valid for Smarty and template object
*
* @var int
*/
public $objMap = 3;
/**
* Valid filter types
*
* @var array
*/
private $filterTypes = array('pre' => true, 'post' => true, 'output' => true, 'variable' => true);
/**
* Registers a filter function
*
* @api Smarty::registerFilter()
*
* @link http://www.smarty.net/docs/en/api.register.filter.tpl
*
* @param \Smarty_Internal_TemplateBase|\Smarty_Internal_Template|\Smarty $obj
* @param string $type filter type
* @param callback $callback
* @param string|null $name optional filter name
*
* @return \Smarty|\Smarty_Internal_Template
* @throws \SmartyException
*/
public function registerFilter(Smarty_Internal_TemplateBase $obj, $type, $callback, $name = null)
{
$smarty = isset($obj->smarty) ? $obj->smarty : $obj;
$this->_checkFilterType($type);
$name = isset($name) ? $name : $this->_getFilterName($callback);
if (!is_callable($callback)) {
throw new SmartyException("{$type}filter \"{$name}\" not callable");
}
$smarty->registered_filters[$type][$name] = $callback;
return $obj;
}
/**
* Return internal filter name
*
* @param callback $function_name
*
* @return string internal filter name
*/
public function _getFilterName($function_name)
{
if (is_array($function_name)) {
$_class_name = (is_object($function_name[0]) ? get_class($function_name[0]) : $function_name[0]);
return $_class_name . '_' . $function_name[1];
} elseif (is_string($function_name)) {
return $function_name;
} else {
return 'closure';
}
}
/**
* Check if filter type is valid
*
* @param string $type
*
* @throws \SmartyException
*/
public function _checkFilterType($type)
{
if (!isset($this->filterTypes[$type])) {
throw new SmartyException("Illegal filter type \"{$type}\"");
}
}
}
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