Update

src/LanguageServer.php

@@ -2,16 +2,17 @@
 
 namespace LanguageServer;
 
-use LanguageServer\Protocol\ProtocolServer;
+use LanguageServer\Protocol\{ProtocolServer, ServerCapabilities};
+use LanguageServer\Protocol\Methods\Initialize\{InitializeRequest, InitializeResult, InitializeResponse};
 
 class LanguageServer extends ProtocolServer
 {
-    public function listen()
+    public function initialize(InitializeRequest $req): InitializeResponse
     {
-        $this->on('initialize', function (InitializeRequest $req) {
-            $res = new InitializeResponse();
-            $this->sendResponse($res);
-        });
-        parent::listen();
+        $result = new InitializeResult;
+        $result->capabilites = new ServerCapabilities;
+        return new InitializeResponse($result);
     }
+
+    public function shutdown
 }

src/Protocol/Methods/Initialize/InitializeResponse.php

@@ -2,14 +2,10 @@
 
 namespace LanguageServer\Protocol\Methods\Initialize;
 
-use LanguageServer\Protocol\Response;
-
-class InitializeResponse extends Response
+class InitializeResponse
 {
     /**
-     * The capabilities the language server provides.
-     *
-     * @var LanguageServer\Protocol\ServerCapabilities
+     * @var InitializeResult
      */
-    public $capabilites;
+    public $result;
 }

src/Protocol/Methods/Initialize/InitializeResult.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace LanguageServer\Protocol\Methods\Initialize;
+
+use LanguageServer\Protocol\Result;
+
+class InitializeResult extends Result
+{
+    /**
+     * The capabilities the language server provides.
+     *
+     * @var LanguageServer\Protocol\ServerCapabilities
+     */
+    public $capabilites;
+}

src/Protocol/ProtocolServer.php

@@ -3,14 +3,14 @@
 namespace LanguageServer\Protocol;
 
 use Sabre\Event\Loop;
-use Sabre\Event\EventEmitter;
+use LanguageServer\Protocol\Methods\Initialize\{InitializeRequest, InitializeResponse};
 
 abstract class ParsingMode {
     const HEADERS = 1;
     const BODY = 2;
 }
 
-class ProtocolServer extends EventEmitter
+abstract class ProtocolServer
 {
     private $input;
     private $output;
@@ -49,7 +49,18 @@ class ProtocolServer extends EventEmitter
                 case ParsingMode::BODY:
                     if (strlen($buffer) === $contentLength) {
                         $req = Message::parse($body, Request::class);
-                        $this->emit($body->method, [$req]);
+                        if (!method_exists($this, $req->method)) {
+                            $this->sendResponse(new Response(null, new ResponseError("Method {$req->method} is not implemented", ErrorCode::METHOD_NOT_FOUND, $e)));
+                        } else {
+                            try {
+                                $result = $this->{$req->method}($req->params);
+                                $this->sendResponse(new Response($result));
+                            } catch (ResponseError $e) {
+                                $this->sendResponse(new Response(null, $e));
+                            } catch (Throwable $e) {
+                                $this->sendResponse(new Response(null, new ResponseError($e->getMessage(), $e->getCode(), null, $e)));
+                            }
+                        }
                         $this->parsingMode = ParsingMode::HEADERS;
                         $this->buffer = '';
                     }
@@ -64,4 +75,6 @@ class ProtocolServer extends EventEmitter
     {
         fwrite($this->output, json_encode($res));
     }
+
+    abstract public function initialize(InitializeRequest $req): InitializeResponse;
 }

src/Protocol/Response.php

@@ -15,12 +15,18 @@ class Response extends Message
     public $method;
 
     /**
-     * @var object|null
+     * @var mixed
      */
-    public $params;
+    public $result;
 
     /**
      * @var ResponseError|null
      */
     public $error;
+
+    public function __construct($result, ResponseError $error = null)
+    {
+        $this->result = $result;
+        $this->error = $error;
+    }
 }

src/Protocol/ResponseError.php

@@ -2,7 +2,9 @@
 
 namespace LanguageServer\Protocol;
 
-class ResponseError
+use Exception;
+
+class ResponseError extends Exception
 {
     /**
      * A number indicating the error type that occurred.
@@ -25,4 +27,10 @@ class ResponseError
      * @var mixed
      */
     public $data;
+
+    public function __construct(string $message, int $code = ErrorCode::INTERNAL_ERROR, $data = null, Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+        $this->data = $data;
+    }
 }

src/Protocol/ServerCapabilities.php

@@ -107,5 +107,5 @@ class ServerCapabilites
      *
      * @var bool|null
      */
-    public $renameProvidern;
+    public $renameProvider;
 }