Add stdio server, mcploader and JSON-RPC extract

Introduce a StdioServer module and mcploader entry script, and extend jsonrpc2 with an extract() helper. stdio-server.js provides an EventTarget-based wrapper for reading/writing via WScript stdio. mcploader.js uses the server and JsonRpc2.extract to parse incoming JSON-RPC messages and respond. Also change DEFAULT_JSONRPC2_URL to http://localhost:5555, export the new extract function, and bump jsonrpc2 version to 0.1.6.

lib/jsonrpc2.js

@@ -38,6 +38,55 @@ function JsonRpc2(url) {
     }    
 }
 
+function extract(message, callback) {
+	var data;
+	
+	if (typeof callback !== "function") {
+		throw new Error("Invalid callback");
+	}
+	
+	try {
+		data = JSON.parse(message);
+	} catch (e) {
+		throw new Error("Invalid JSON: " + e.message);
+	}
+	
+	if (!data || typeof data !== "object") {
+		throw new Error("Invalid request object");
+	}
+	
+	if (data.jsonrpc !== "2.0") {
+		throw new Error("Invalid JSON-RPC version");
+	}
+	
+	if (!data.method || typeof data.method !== "string") {
+		throw new Error("Missing or invalid method");
+	}
+	
+	var params = data.params !== undefined ? data.params : null;
+	var id = data.id !== undefined ? data.id : null;
+	
+	try {
+		var result = callback(data.method, params, id);
+		
+		return {
+			jsonrpc: "2.0",
+			result: result === undefined ? null : result,
+			id: id
+		};
+		
+	} catch (e) {
+		return {
+			jsonrpc: "2.0",
+			error: {
+				code: -32603,
+				message: e && e.message ? e.message : "Internal error"
+			},
+			id: id
+		};
+	}
+}
+
 function wrap(method, params, id) {
     return {
         "jsonrpc": "2.0",
@@ -51,14 +100,15 @@ function create(url) {
     return new JsonRpc2(url);
 }
 
-var DEFAULT_JSONRPC2_URL = "https://azure-ashlan-40.tiiny.io/";
+var DEFAULT_JSONRPC2_URL = "http://localhost:5555";
 
+exports.extract = extract;
 exports.wrap = wrap;
 exports.create = create;
 
 exports.DEFAULT_JSONRPC2_URL = DEFAULT_JSONRPC2_URL;
 
-exports.VERSIONINFO = "JSON-RPC 2.0 wrapper (jsonrpc2.js) version 0.1.5";
+exports.VERSIONINFO = "JSON-RPC 2.0 wrapper (jsonrpc2.js) version 0.1.6";
 exports.AUTHOR = "gnh1201@catswords.re.kr";
 exports.global = global;
 exports.require = global.require;

lib/stdio-server.js

@@ -0,0 +1,58 @@
+// stdio-server.js
+// Copyright 2019-2026, Namhyeon Go <gnh1201@catswords.re.kr> and the WelsonJS contributors.
+// SPDX-License-Identifier: GPL-3.0-or-later
+// https://github.com/gnh1201/welsonjs
+// 
+var STD = require("lib/std");
+
+function StdioServer() {
+    // Set event-attachable object
+    STD.EventTarget.apply(this, arguments);
+    
+    this.messages = [];
+    
+    this.receive = function () {
+        return this.messages.shift();
+    };
+    
+    this.send = function (message) {
+        WScript.StdOut.WriteLine(message);
+    };
+    
+    this.listen = function () {
+        while (!WScript.StdIn.AtEndOfStream) {
+            this.messages.push(WScript.StdIn.ReadLine());
+            this.dispatchEvent(new STD.Event("message"));
+        }
+    };
+}
+StdioServer.prototype = new STD.EventTarget();
+StdioServer.prototype.constructor = StdioServer;
+
+/*
+
+// For example
+var server = new StdioServer();
+
+server.addEventListener("message", function(e) {
+    // receive message
+    var message = e.target.receive();
+    
+    console.log(message);
+    
+    // send message 
+    e.target.send("Hello world");
+});
+
+server.listen();
+
+*/
+
+exports.create = function () {
+    return new StdioServer();
+};
+
+exports.VERSIONINFO = "Stdio Server (stdio-server.js) version 0.1";
+exports.AUTHOR = "gnh1201@catswords.re.kr";
+exports.global = global;
+exports.require = global.require;

mcploader.js

@@ -0,0 +1,30 @@
+// mcploader.js
+// Copyright 2019-2026, Namhyeon Go <gnh1201@catswords.re.kr> and the WelsonJS contributors.
+// SPDX-License-Identifier: GPL-3.0-or-later
+// https://github.com/gnh1201/welsonjs
+// 
+var StdioServer = require("lib/stdio-server");
+var JsonRpc2 = require("lib/jsonrpc2");
+
+function main(args) {
+	var server = StdioServer.create();
+
+	server.addEventListener("message", function(e) {
+		var message = e.target.receive();
+		
+		try {
+			JsonRpc2.extract(message, function(method, params, id) {
+				console.log("Received method: " + method);
+			});
+		} catch (e) {
+			console.log("Ignored");
+		}
+		
+		// send message 
+		e.target.send("Hello world");
+	});
+
+	server.listen();
+}
+
+exports.main = main;