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139 lines
3.6 KiB
139 lines
3.6 KiB
<?php
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/**
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* Flight: An extensible micro-framework.
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*
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* @copyright Copyright (c) 2011, Mike Cao <mike@mikecao.com>
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* @license http://www.opensource.org/licenses/mit-license.php
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*/
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namespace flight\net;
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/**
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* The Router class is responsible for routing an HTTP request to
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* an assigned callback function. The Router tries to match the
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* requested URL against a series of URL patterns.
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*/
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class Router {
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/**
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* Mapped routes.
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*
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* @var array
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*/
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protected $routes = array();
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/**
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* Matched route.
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*
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* @var string
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*/
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public $matched = null;
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/**
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* Matched URL parameters.
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*
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* @var array
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*/
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public $params = array();
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/**
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* Gets mapped routes.
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*
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* @return array Array of routes
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*/
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public function getRoutes() {
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return $this->routes;
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}
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/**
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* Resets the router.
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*/
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public function clear() {
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$this->routes = array();
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}
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/**
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* Maps a URL pattern to a callback function.
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*
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* @param string $pattern URL pattern to match
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* @param callback $callback Callback function
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*/
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public function map($pattern, $callback) {
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if (strpos($pattern, ' ') !== false) {
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list($method, $url) = explode(' ', trim($pattern), 2);
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foreach (explode('|', $method) as $value) {
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$this->routes[$value][$url] = $callback;
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}
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}
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else {
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$this->routes['*'][$pattern] = $callback;
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}
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}
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/**
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* Tries to match a requst to a route. Also parses named parameters in the url.
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*
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* @param string $pattern URL pattern
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* @param string $url Requested URL
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*/
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public function match($pattern, $url) {
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$ids = array();
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// Build the regex for matching
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$regex = '/^'.implode('\/', array_map(
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function($str) use (&$ids){
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if ($str == '*') {
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$str = '(.*)';
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}
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else if ($str != null && $str{0} == '@') {
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if (preg_match('/@(\w+)(\:([^\/|\(]*))?([\(|\)]+)?/', $str, $matches)) {
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$ids[$matches[1]] = null;
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return '(?P<'.$matches[1].'>'
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.(!empty($matches[3]) ? $matches[3] : '[^(\/|\?)]+')
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.')'
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.(!empty($matches[4]) ? str_replace(')',')?',$matches[4]) : '');
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}
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}
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return $str;
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},
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explode('/', $pattern)
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)).'\/?(?:\?.*)?$/i';
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// Attempt to match route and named parameters
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if (preg_match($regex, $url, $matches)) {
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foreach ($ids as $k => $v) {
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$this->params[$k] = (array_key_exists($k, $matches)) ? urldecode($matches[$k]) : null;
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}
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$this->matched = $pattern;
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return true;
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}
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return false;
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}
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/**
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* Routes the current request.
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*
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* @param object $request Request object
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* @return callable Matched callback function
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*/
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public function route(Request $request) {
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$this->matched = null;
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$this->params = array();
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$routes = isset($this->routes[$request->method]) ? $this->routes[$request->method] : array();
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if (isset($this->routes['*'])) $routes += $this->routes['*'];
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foreach ($routes as $pattern => $callback) {
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if ($pattern === '*' || $request->url === $pattern || self::match($pattern, $request->url)) {
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return $callback;
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}
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}
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return false;
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}
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}
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?>
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