October 27, 2014 16:02 · Oct 27, 2014
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,273 @@
+<?php
+
+class Router {
+
+	protected $routes = array();
+	protected $namedRoutes = array();
+	protected $basePath = '';
+	protected $matchTypes = array(
+		'i'  => '[0-9]++',
+		'a'  => '[0-9A-Za-z]++',
+		'h'  => '[0-9A-Fa-f]++',
+		'*'  => '.+?',
+		'**' => '.++',
+		''   => '[^/\.]++'
+	);
+
+	/**
+	  * Create router in one call from config.
+	  *
+	  * @param array $routes
+	  * @param string $basePath
+	  * @param array $matchTypes
+	  */
+	public function __construct( $routes = array(), $basePath = '', $matchTypes = array() ) {
+		$this->addRoutes($routes);
+		$this->setBasePath($basePath);
+		$this->addMatchTypes($matchTypes);
+	}
+
+	/**
+	 * Add multiple routes at once from array in the following format:
+	 *
+	 *   $routes = array(
+	 *      array($method, $route, $target, $name)
+	 *   );
+	 *
+	 * @param array $routes
+	 * @return void
+	 * @author Koen Punt
+	 */
+	public function addRoutes($routes){
+		if(!is_array($routes) && !$routes instanceof Traversable) {
+			throw new \Exception('Routes should be an array or an instance of Traversable');
+		}
+		foreach($routes as $route) {
+			call_user_func_array(array($this, 'map'), $route);
+		}
+	}
+
+	/**
+	 * Set the base path.
+	 * Useful if you are running your application from a subdirectory.
+	 */
+	public function setBasePath($basePath) {
+		$this->basePath = $basePath;
+	}
+
+	/**
+	 * Add named match types. It uses array_merge so keys can be overwritten.
+	 *
+	 * @param array $matchTypes The key is the name and the value is the regex.
+	 */
+	public function addMatchTypes($matchTypes) {
+		$this->matchTypes = array_merge($this->matchTypes, $matchTypes);
+	}
+
+	/**
+	 * Map a route to a target
+	 *
+	 * @param string $method One of 5 HTTP Methods, or a pipe-separated list of multiple HTTP Methods (GET|POST|PATCH|PUT|DELETE)
+	 * @param string $route The route regex, custom regex must start with an @. You can use multiple pre-set regex filters, like [i:id]
+	 * @param mixed $target The target where this route should point to. Can be anything.
+	 * @param string $name Optional name of this route. Supply if you want to reverse route this url in your application.
+	 */
+	public function map($method, $route, $target, $name = null) {
+
+		$this->routes[] = array($method, $route, $target, $name);
+
+		if($name) {
+			if(isset($this->namedRoutes[$name])) {
+				throw new \Exception("Can not redeclare route '{$name}'");
+			} else {
+				$this->namedRoutes[$name] = $route;
+			}
+
+		}
+
+		return;
+	}
+
+	/**
+	 * Reversed routing
+	 *
+	 * Generate the URL for a named route. Replace regexes with supplied parameters
+	 *
+	 * @param string $routeName The name of the route.
+	 * @param array @params Associative array of parameters to replace placeholders with.
+	 * @return string The URL of the route with named parameters in place.
+	 */
+	public function generate($routeName, array $params = array()) {
+
+		// Check if named route exists
+		if(!isset($this->namedRoutes[$routeName])) {
+			throw new \Exception("Route '{$routeName}' does not exist.");
+		}
+
+		// Replace named parameters
+		$route = $this->namedRoutes[$routeName];
+
+		// prepend base path to route url again
+		$url = $this->basePath . $route;
+
+		if (preg_match_all('`(/|\.|)\[([^:\]]*+)(?::([^:\]]*+))?\](\?|)`', $route, $matches, PREG_SET_ORDER)) {
+
+			foreach($matches as $match) {
+				list($block, $pre, $type, $param, $optional) = $match;
+
+				if ($pre) {
+					$block = substr($block, 1);
+				}
+
+				if(isset($params[$param])) {
+					$url = str_replace($block, $params[$param], $url);
+				} elseif ($optional) {
+					$url = str_replace($pre . $block, '', $url);
+				}
+			}
+
+
+		}
+
+		return $url;
+	}
+
+	/**
+	 * Match a given Request Url against stored routes
+	 * @param string $requestUrl
+	 * @param string $requestMethod
+	 * @return array|boolean Array with route information on success, false on failure (no match).
+	 */
+	public function match($requestUrl = null, $requestMethod = null) {
+
+		$params = array();
+		$match = false;
+
+		// set Request Url if it isn't passed as parameter
+		if($requestUrl === null) {
+			$requestUrl = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '/';
+		}
+
+		// strip base path from request url
+		$requestUrl = substr($requestUrl, strlen($this->basePath));
+
+		// Strip query string (?a=b) from Request Url
+		if (($strpos = strpos($requestUrl, '?')) !== false) {
+			$requestUrl = substr($requestUrl, 0, $strpos);
+		}
+
+		// set Request Method if it isn't passed as a parameter
+		if($requestMethod === null) {
+			$requestMethod = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
+		}
+
+		// Force request_order to be GP
+		// http://www.mail-archive.com/internals@lists.php.net/msg33119.html
+		$_REQUEST = array_merge($_GET, $_POST);
+
+		foreach($this->routes as $handler) {
+			list($method, $_route, $target, $name) = $handler;
+
+			$methods = explode('|', $method);
+			$method_match = false;
+
+			// Check if request method matches. If not, abandon early. (CHEAP)
+			foreach($methods as $method) {
+				if (strcasecmp($requestMethod, $method) === 0) {
+					$method_match = true;
+					break;
+				}
+			}
+
+			// Method did not match, continue to next route.
+			if(!$method_match) continue;
+
+			// Check for a wildcard (matches all)
+			if ($_route === '*') {
+				$match = true;
+                        } elseif (is_callable($_route)) {
+                            $match = $_route();
+			} elseif (isset($_route[0]) && $_route[0] === '@') {
+				$pattern = '`' . substr($_route, 1) . '`u';
+				$match = preg_match($pattern, $requestUrl, $params);
+			} else {
+				$route = null;
+				$regex = false;
+				$j = 0;
+				$n = isset($_route[0]) ? $_route[0] : null;
+				$i = 0;
+
+				// Find the longest non-regex substring and match it against the URI
+				while (true) {
+					if (!isset($_route[$i])) {
+						break;
+					} elseif (false === $regex) {
+						$c = $n;
+						$regex = $c === '[' || $c === '(' || $c === '.';
+						if (false === $regex && false !== isset($_route[$i+1])) {
+							$n = $_route[$i + 1];
+							$regex = $n === '?' || $n === '+' || $n === '*' || $n === '{';
+						}
+						if (false === $regex && $c !== '/' && (!isset($requestUrl[$j]) || $c !== $requestUrl[$j])) {
+							continue 2;
+						}
+						$j++;
+					}
+					$route .= $_route[$i++];
+				}
+
+				$regex = $this->compileRoute($route);
+				$match = preg_match($regex, $requestUrl, $params);
+			}
+
+			if(($match == true || $match > 0)) {
+
+				if($params) {
+					foreach($params as $key => $value) {
+						if(is_numeric($key)) unset($params[$key]);
+					}
+				}
+
+				return array(
+					'target' => $target,
+					'params' => $params,
+					'name' => $name
+				);
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Compile the regex for a given route (EXPENSIVE)
+	 */
+	private function compileRoute($route) {
+		if (preg_match_all('`(/|\.|)\[([^:\]]*+)(?::([^:\]]*+))?\](\?|)`', $route, $matches, PREG_SET_ORDER)) {
+
+			$matchTypes = $this->matchTypes;
+			foreach($matches as $match) {
+				list($block, $pre, $type, $param, $optional) = $match;
+
+				if (isset($matchTypes[$type])) {
+					$type = $matchTypes[$type];
+				}
+				if ($pre === '.') {
+					$pre = '\.';
+				}
+
+				//Older versions of PCRE require the 'P' in (?P<named>)
+				$pattern = '(?:'
+						. ($pre !== '' ? $pre : null)
+						. '('
+						. ($param !== '' ? "?P<$param>" : null)
+						. $type
+						. '))'
+						. ($optional !== '' ? '?' : null);
+
+				$route = str_replace($block, $pattern, $route);
+			}
+
+		}
+		return "`^$route$`u";
+	}
+}
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