From 464f4d3497617fadb9d7752868f1175849cfa6d2 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <LukeShu@sbcglobal.net>
Date: Sat, 7 Jan 2012 08:21:00 -0800
Subject: Refactor to separate the framework from the app; drop message stuff,
 this app is just user management. Add a json view for individual users

---
 lpf/lib/Router.class.php | 110 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 lpf/lib/Router.class.php

(limited to 'lpf/lib/Router.class.php')

diff --git a/lpf/lib/Router.class.php b/lpf/lib/Router.class.php
new file mode 100644
index 0000000..238e3f8
--- /dev/null
+++ b/lpf/lib/Router.class.php
@@ -0,0 +1,110 @@
+<?php
+
+require_once('Controller.class.php');
+
+class Router {
+	/**
+	 * Array mapping URIs to controllers.
+	 * A controller may register itself either by using
+	 * Router::register($URI, $controller[, $function]);
+	 * or by adding itself to the $ROUTER global.
+	 * 
+	 * The default here just gives us a 404 handler.
+	 */
+	private $routes = array('/*' => 'Http404');
+	
+	/**
+	 * Instantiate a router that looks for controllers in $controllerpath.
+	 */
+	public function Router($controllerpath) {
+		// create a $ROUTES global that can be used to set up our
+		// $this->routes.
+		global $ROUTES;
+		$ROUTES = $this->routes;
+
+		// Split $controllerpath into directories, and load the
+		// controllers in each.
+		$dirs = explode(PATH_SEPARATOR, $controllerpath);
+		foreach ($dirs as $dir) {
+			// Find all files in $dir with the ext `.class.php'
+			$files = glob($dir.'/*.class.php');
+			foreach ($files as $file) {
+				// and include them
+				require_once($file);
+			}
+		}
+		
+		$this->routes = $ROUTES;
+		unset($ROUTES);
+	}
+
+	/**
+	 * Route the page at the relative URL $page to the appropriate
+	 * controller, and call the appropriate function.
+	 */
+	public function route($page) {
+		$parts = explode('/', $page);
+		$length = count($parts); // the # of segments in $controllerpart
+		
+		// if $page ends in "/", strip that off
+		if ($parts[$length-1]=='') {
+			array_pop($parts);
+			$length--;
+		}
+
+		$controllerpart = implode('/', $parts);
+		
+		// Keep shortening $controllerpart until it matches something in
+		// $this->routes.  The shortest it will ever become is '/*'.
+		// If no key exists for '/*', that's an infinite loop.
+		// Fortunately, the default value of $this->routes directs '/*'
+		// to the Http404 controller.
+		while(!isset($this->routes[$controllerpart])) {
+			$some_parts = array_slice($parts, 0, $length);
+			$controllerpart = implode('/', $some_parts).'/*';
+			$length--;
+		}
+		$length++;
+		
+		// Figure what function to call on what controller
+		// Grammar Nazi Warning: `what' or `which'?
+		$controller = $this->routes[$controllerpart];
+		if (strpos($controller, '->')===false) {
+			// imply function
+			$function = $parts[$length];
+		} else {
+			preg_match('/(.*)->(.*)/', $controller, $matches);
+			$controller = $matches[1];
+			$function = $matches[2];
+		}
+		
+		// Default to the `index' function, provided by all controllers
+		if ($function=='') {
+			$function = 'index';
+		}
+		
+		// We will pass these arrays to the function.
+		$routed = array_slice($parts, 0, $length);
+		$remainder = array_slice($parts, $length);
+		
+		// Finally, run the controller
+		$obj = new $controller();
+		if (in_array($function, get_class_methods($obj))) {
+			call_user_func(array($obj, $function),
+			               $routed, $remainder);
+		} else {
+			$obj->http404($routed, $remainder);
+		}
+	}
+	
+	/**
+	 * This is to allow controllers to register themselves to the router.
+	 * If $function=='', then the function will be determined by the segment
+	 * to the right of the last segment in $path
+	 */
+	public static function register($path, $controller, $function='') {
+		$str = $controller.(($function=='')?'':'->'.$function);
+		global $ROUTES;
+		$ROUTES[$path] = $str;
+	}
+}
\ No newline at end of file
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