sandboxos => tildefriends

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3157 ed5197a5-7fde-0310-b194-c3ffbd925b24

packages/cory/mmoturtle/mmoturtle.js

@@ -0,0 +1,124 @@
+"use strict";
+
+// This script runs server-side, once for each client session.
+
+if (imports.terminal) {
+	terminal.setEcho(false);
+	terminal.split([
+		{name: "graphics", basis: "520px", shrink: "0", grow: "0"},
+		{name: "text"},
+	]);
+
+	// Request a callback every time the user hits enter at the terminal prompt.
+	core.register("onInput", function(input) {
+		// Ask a persistent service session to broadcast our message.  We'll also get a copy back.
+		return core.getService("turtle").then(function(service) {
+			return service.postMessage(input);
+		});
+	});
+
+	// Request a callback for every message that is broadcast.
+	core.register("onMessage", function(sender, message) {
+		if (message.history) {
+			for (var i = 0; i < message.history.length; i++) {
+				// Pass the message on to the iframe in the client.
+				terminal.postMessageToIframe("turtle", message.history[i]);
+			}
+		} else {
+			// Pass the message on to the iframe in the client.
+			terminal.postMessageToIframe("turtle", message);
+		}
+	});
+
+	core.register("onWindowMessage", function(data) {
+		terminal.print(data.message);
+	});
+
+	terminal.select("graphics");
+	terminal.print("MMO Turtle Graphics using ", {href: "http://codeheartjs.com/turtle/"}, ".");
+
+	// Add an iframe to the terminal.  This is how we sandbox code running on the client.
+	var contents = `
+	<script src="http://codeheartjs.com/turtle/turtle.min.js">-*- javascript -*-</script>
+	<script>
+	setScale(2);
+	setWidth(3);
+
+	// Receive messages in the iframe and use them to draw.
+	function onMessage(event) {
+		var parts = event.data.split(" ");
+		var command = parts.shift();
+		if (command == "reset") {
+			setPosition(0, 0);
+			setHeading(0);
+			clear(WHITE);
+			_ch_startTimer(30);
+		} else if (command == "home") {
+			var wasDown = _turtle.penDown;
+			pu();
+			setPosition(0, 0);
+			setHeading(0);
+			if (wasDown) {
+				pd();
+			}
+			_ch_startTimer(30);
+		} else if (command == "clear") {
+			clear(WHITE);
+			_ch_startTimer(30);
+		} else if (["fd", "bk", "rt", "lt", "pu", "pd"].indexOf(command) != -1) {
+			window[command].apply(window, parts.map(parseInt));
+			event.source.postMessage(event.data, event.origin);
+			_ch_startTimer(30);
+		} else {
+			event.source.postMessage("Unrecognized command: " + command, event.origin);
+		}
+	}
+
+	// Register for messages in the iframe
+	window.addEventListener('message', onMessage, false);
+	</script>
+	`
+	terminal.print({iframe: contents, width: 640, height: 480, name: "turtle"});
+
+	terminal.select("text");
+	terminal.print("Supported commands: ", ["fd <distance>", "bk <distance>", "rt <angle>", "lt <angle>", "pu", "pd", "home", "reset", "clear"].join(", "));
+
+	// Get the party started by asking for the history of commands (the turtle party).
+	setTimeout(function() {
+		core.getService("turtle").then(function(service) {
+			return service.postMessage("sync");
+		});
+	}, 1000);
+} else {
+	var gHistory = null;
+
+	function ensureHistoryLoaded() {
+		if (!gHistory) {
+			return database.get("history").then(function(data) {
+				gHistory = JSON.parse(data);
+				return gHistory;
+			}).catch(function(error) {
+				gHistory = [];
+				return gHistory;
+			});
+		} else {
+			return new Promise(function(resolve, reject) { resolve(gHistory); });
+		}
+	}
+
+	core.register("onMessage", function(sender, message) {
+		return ensureHistoryLoaded().then(function(history) {
+			if (message == "reset") {
+				history.length = 0;
+				database.set("history", JSON.stringify(history));
+				return core.broadcast(message);
+			} else if (message == "sync") {
+				sender.postMessage({history: history});
+			} else {
+				history.push(message);
+				database.set("history", JSON.stringify(history));
+				return core.broadcast(message);
+			}
+		});
+	});
+}