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<?php
/*
* File: ratatoeskr/sys/urlprocess.php
*
* Providing functions / classes to handle URLs
*
* License:
* This file is part of Ratatöskr.
* Ratatöskr is licensed unter the MIT / X11 License.
* See "ratatoeskr/licenses/ratatoeskr" for more information.
*/
/*
* Function: url_action_simple
* Generate an action in a more simple way.
*
* Parameters:
* $function - A callback that gets the $data var as an input and returns the new $data var. Can throw an <Redirect> Exception.
*
* Returns:
* A callback that can be used as an url action.
*/
function url_action_simple($function)
{
return function(&$data, $url_now, &$url_next) use ($function)
{
try
{
$data = call_user_func($function, $data);
$url_next = array();
}
catch(Redirect $e)
{
$url_next = $e->nextpath;
}
};
}
/*
* Function: url_action_subactions
* Generate an action that contains subactions. Subactions can redirect to ".." to go to the level above.
*
* Parameters:
* $actions - Associative array of actions.
*
* Returns:
* A callback that can be used as an url action.
*/
function url_action_subactions($actions)
{
return function(&$data, $url_now, &$url_next) use ($actions)
{
$result = url_process($url_next, $actions, $data);
if($result !== NULL)
$url_next = $result;
else
$url_next = array();
};
}
/*
* Function: url_action_alias
* Generate an action that is an alias for another one (i.e. redirects).
*
* Parameters:
* $for - Path (array) of the action this one should be an alias of.
*
* Returns:
* A callback that can be used as an url action.
*/
function url_action_alias($for)
{
return function(&$data, $url_now, &$url_next) use($for)
{
$url_next = array_merge($for, $url_next);
};
}
/*
* Function: url_process
* Choose an appropiate action for the given URL.
*
* Parameters:
* $url - Either an array containing the URL components or the URL (both relative).
* $actions - Associative array of actions.
* Key is the name (anything alphanumeric, should usually not start with '_', reserved for special URL names, see beneath).
* Value is a callback of the form: function(&$data, $url_now, &$url_next). $data can be used for shared data between subactions. $url_next can be modified in order to redirect to another action / stop the routing.
*
* Special actions:
* _index - If name is empty, the index will be called.
* _default - If nothing was found, this is the default.
* _notfound - If not even _default exists or NotFoundError was thrown.
* _prelude - If existant, will be executed before everything else.
* _epilog - If existant, will be executed after evrything else.
*/
function url_process($url, $actions, &$data)
{
$epilog_running = 0;
if(is_string($url))
$url = explode("/", $url);
if(count($url) == 0)
$url = array("_index");
if(isset($actions["_prelude"]))
$url = array_merge(array("_prelude"), $url);
$url_now = $url[0];
$url_next = array_slice($url, 1);
while(is_string($url_now) and ($url_now != "") and ($url_now != ".."))
{
$cb = NULL;
if(empty($url_now))
$url_now = "_index";
if(isset($actions[$url_now]))
$cb = $actions[$url_now];
else if(isset($actions["_default"]))
$cb = $actions["_default"];
else if(isset($actions["_notfound"]))
$cb = $actions["_notfound"];
else
throw new NotFoundError();
try
{
$cb($data, $url_now, $url_next);
}
catch(NotFoundError $e)
{
if(isset($actions["_notfound"]))
$url_next = array("_notfound");
else
throw $e;
}
if(count($url_next) > 0)
{
$url_now = $url_next[0];
$url_next = array_slice($url_next, 1);
}
else if(isset($actions["_epilog"]) and ($epilog_running <= 0))
{
$epilog_running = 2;
$url_now = "_epilog";
}
else
$url_now = "";
--$epilog_running;
}
if($url_now == "..")
return $url_next;
else
return NULL;
}
/*
* Class: Redirect
* Exception that can be thrown inside an <url_action_simple>.
* throw new Redirect(array("..", "foo")); will redirect to "../foo" and won't touch $data.
*/
class Redirect extends Exception
{
public $nextpath;
public function __construct($nextpath)
{
$this->nextpath = $nextpath;
parent::__construct();
}
}
/*
* Class: NotFoundError
* An Exception
*/
class NotFoundError extends Exception { }
?>
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