139 lines
3.3 KiB
PHP
139 lines
3.3 KiB
PHP
<?php namespace System;
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class Router {
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/**
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* The request method and URI.
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*
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* @var string
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*/
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public $request;
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/**
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* All of the loaded routes.
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*
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* @var array
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*/
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public $routes;
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/**
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* Create a new router for a request method and URI.
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*
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* @param string $method
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* @param string $uri
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* @param array $routes
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* @return void
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*/
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public function __construct($method, $uri, $routes = null)
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{
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// Put the request method and URI in route form.
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// Routes begin with the request method and a forward slash.
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$this->request = $method.' /'.trim($uri, '/');
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$this->routes = (is_array($routes)) ? $routes : $this->load($uri);
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}
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/**
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* Create a new router for a request method and URI.
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*
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* @param string $method
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* @param string $uri
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* @param array $routes
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* @return Router
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*/
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public static function make($method, $uri, $routes = null)
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{
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return new static($method, $uri, $routes);
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}
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/**
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* Load the appropriate routes for the request URI.
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*
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* @param string $uri
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* @return array
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*/
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public function load($uri)
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{
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$base = require APP_PATH.'routes'.EXT;
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if ( ! is_dir(APP_PATH.'routes') or $uri == '')
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{
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return $base;
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}
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list($routes, $segments) = array(array(), explode('/', $uri));
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foreach (array_reverse($segments, true) as $key => $value)
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{
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if (file_exists($path = ROUTE_PATH.implode('/', array_slice($segments, 0, $key + 1)).EXT))
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{
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$routes = require $path;
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}
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}
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return array_merge($routes, $base);
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}
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/**
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* Search a set of routes for the route matching a method and URI.
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*
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* @return Route
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*/
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public function route()
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{
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if (isset($this->routes[$this->request]))
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{
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return Request::$route = new Route($this->request, $this->routes[$this->request]);
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}
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foreach ($this->routes as $keys => $callback)
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{
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// Only check routes that have multiple URIs or wildcards.
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// Other routes would have been caught by the check for literal matches.
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if (strpos($keys, '(') !== false or strpos($keys, ',') !== false )
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{
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foreach (explode(', ', $keys) as $key)
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{
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if (preg_match('#^'.$this->translate_wildcards($key).'$#', $this->request))
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{
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return Request::$route = new Route($keys, $callback, $this->parameters($this->request, $key));
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}
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}
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}
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}
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}
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/**
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* Translate route URI wildcards into actual regular expressions.
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*
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* @param string $key
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* @return string
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*/
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private function translate_wildcards($key)
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{
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$replacements = 0;
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// For optional parameters, first translate the wildcards to their regex equivalent, sans the ")?" ending.
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// We will add the endings back on after we know how many replacements we made.
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$key = str_replace(array('/(:num?)', '/(:any?)'), array('(?:/([0-9]+)', '(?:/([a-zA-Z0-9\-_]+)'), $key, $replacements);
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$key .= ($replacements > 0) ? str_repeat(')?', $replacements) : '';
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return str_replace(array(':num', ':any'), array('[0-9]+', '[a-zA-Z0-9\-_]+'), $key);
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}
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/**
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* Extract the parameters from a URI based on a route URI.
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*
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* Any route segment wrapped in parentheses is considered a parameter.
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*
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* @param string $uri
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* @param string $route
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* @return array
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*/
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private function parameters($uri, $route)
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{
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return array_values(array_intersect_key(explode('/', $uri), preg_grep('/\(.+\)/', explode('/', $route))));
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}
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} |