make params an empty array instead of null

src/RouterInterface.php

@@ -2,8 +2,8 @@
 
 namespace Sharkk\Router;
 
-interface Router
+interface RouterInterface
 {
-	public function add(string $method, string $route, callable $handler): Router;
+	public function add(string $method, string $route, callable $handler): RouterInterface;
 	public function lookup(string $method, string $uri): array;
 }

src/SegmentRouter.php

@@ -2,11 +2,18 @@
 
 namespace Sharkk\Router;
 
-class SegmentRouter implements Router
+class SegmentRouter implements RouterInterface
 {
-	public array $routes = [];
+	private array $routes = [];
 
-	public function add(string $method, string $route, callable $handler): Router
+	/**
+	 * Add a route to the route tree. The route must be a URI path, and contain dynamic segments
+	 * using a colon prefix. (:id, :slug, etc)
+	 *
+	 * Example:
+	 * `$r->add('GET', '/posts/:id', function($id) { echo "Viewing post $id"; });`
+	 */
+	public function add(string $method, string $route, callable $handler): RouterInterface
 	{
 		// Expand the route into segments and make dynamic segments into a common placeholder
 		$segments = array_map(function($segment) {
@@ -27,7 +34,13 @@ class SegmentRouter implements Router
 		return $this;
 	}
 
-	// @return array{code: int, handler: callable, params: array|null }
+	/**
+	 * Perform a lookup in the route tree for a given method and URI. Returns an array with a result code,
+	 * a handler if found, and any dynamic parameters. Codes are 200 for success, 404 for not found, and
+	 * 405 for method not allowed.
+	 *
+	 * @return array ['code', 'handler', 'params']
+	 */
 	public function lookup(string $method, string $uri): array
 	{
 		// node is a reference to our current location in the node tree
@@ -59,18 +72,77 @@ class SegmentRouter implements Router
 			}
 
 			// if we can't find a node for this segment, return 404
-			return ['code' => 404, 'handler' => null, 'params' => null];
+			return ['code' => 404, 'handler' => null, 'params' => []];
 		}
 
 		// if we found a handler for the method, return it and any params. if not, return a 405
 		return isset($node[$method])
-			? ['code' => 200, 'handler' => $node[$method], 'params' => $params ?? null]
+			? ['code' => 200, 'handler' => $node[$method], 'params' => $params ?? []]
-			: ['code' => 405, 'handler' => null, 'params' => null];
+			: ['code' => 405, 'handler' => null, 'params' => []];
 	}
 
-	public function clear(): Router
+	/**
+	 * Clear all routes from the router.
+	 */
+	public function clear(): RouterInterface
 	{
 		$this->routes = [];
 		return $this;
 	}
+
+	/**
+	 * Dump the route tree as an array.
+	 */
+	public function dump(): array
+	{
+		return $this->routes;
+	}
+
+	/**
+	 * Register a GET route.
+	 */
+	public function get(string $route, callable $handler): RouterInterface
+	{
+		return $this->add('GET', $route, $handler);
+	}
+
+	/**
+	 * Register a POST route.
+	 */
+	public function post(string $route, callable $handler): RouterInterface
+	{
+		return $this->add('POST', $route, $handler);
+	}
+
+	/**
+	 * Register a PUT route.
+	 */
+	public function put(string $route, callable $handler): RouterInterface
+	{
+		return $this->add('PUT', $route, $handler);
+	}
+
+	/**
+	 * Register a PATCH route.
+	 */
+	public function patch(string $route, callable $handler): RouterInterface
+	{
+		return $this->add('PATCH', $route, $handler);
+	}
+
+	/**
+	 * Register a DELETE route.
+	 */
+	public function delete(string $route, callable $handler): RouterInterface
+	{
+		return $this->add('DELETE', $route, $handler);
+	}
+
+	/**
+	 * Register a HEAD route.
+	 */
+	public function head(string $route, callable $handler): RouterInterface
+	{
+		return $this->add('HEAD', $route, $handler);
+	}
 }