Initial WIP
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Tony Garnock-Jones
commit
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@ -0,0 +1,25 @@
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<!doctype html>
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<html>
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<head>
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<title>JS Marketplace</title>
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<meta charset="utf-8">
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<link href="bootstrap/css/bootstrap.min.css" rel="stylesheet">
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<link href="bootstrap/css/bootstrap-responsive.min.css" rel="stylesheet">
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<script src="bootstrap/js/bootstrap.min.js"></script>
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<script src="marketplace.js"></script>
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</head>
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<body>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<h1>JS Marketplace</h1>
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<p>
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Hello, world.
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</p>
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</div>
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</div>
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</div>
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</body>
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</html>
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@ -0,0 +1,176 @@
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/*---------------------------------------------------------------------------*/
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/* Unification */
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var __ = new Object(); /* wildcard marker */
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__.__ = "__";
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function unificationFailed() {
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throw {unificationFailed: true};
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}
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function unify1(a, b) {
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var i;
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if (a === __) return b;
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if (b === __) return a;
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if (a === b) return a;
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if (Array.isArray(a) && Array.isArray(b)) {
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if (a.length !== b.length) unificationFailed();
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var result = [];
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for (i = 0; i < a.length; i++) {
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result.push(unify1(a[i], b[i]));
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}
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return result;
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}
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if (typeof a === "object" && typeof b === "object") {
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/* TODO: consider other kinds of matching. I've chosen to
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require any field mentioned by either side to be present in
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both. Does that make sense? */
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var result = ({});
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for (i in a) { if a.hasOwnProperty(i) result[i] = true; }
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for (i in b) { if b.hasOwnProperty(i) result[i] = true; }
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for (i in result) {
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if (result.hasOwnProperty(i)) {
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result[i] = unify1(a[i], b[i]);
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}
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}
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return result;
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}
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unificationFailed();
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}
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function unify(a, b) {
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try {
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return {result: unify1(a, b)};
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} catch (e) {
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if (e.unificationFailed) return undefined;
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throw e;
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}
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}
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function anyUnify(aa, bb) {
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for (var i = 0; i < aa.length; i++) {
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for (var j = 0; j < bb.length; j++) {
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if (unify(aa[i], bb[j])) return true;
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}
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}
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return false;
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}
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/*---------------------------------------------------------------------------*/
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/* Relaying */
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function Route(polarity, pattern, isMeta, level) {
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isMeta = isMeta ? true : false;
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level = (level === undefined) ? 0 : level;
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switch (polarity) {
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case "pub":
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this.isSubscription = false;
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break;
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case "sub":
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this.isSubscription = true;
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break;
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default:
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throw { message: "Invalid route polarity: " + polarity,
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polarity: polarity,
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pattern: pattern,
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isMeta: isMeta,
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level: level };
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}
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this.pattern = pattern;
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this.isMeta = isMeta;
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this.level = level;
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}
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function sub(pattern, isMeta, level) {
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return new Route("sub", pattern, isMeta, level);
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}
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function pub(pattern, isMeta, level) {
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return new Route("pub", pattern, isMeta, level);
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}
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function spawn(actor) { /* TODO: initialRoutes */
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return { type: "spawn", actor: actor };
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}
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function updateRoutes(routes) {
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return { type: "routes", routes: routes };
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}
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function sendMessage(m) {
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return { type: "send", isMeta: false, message: m };
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}
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function metaMessage(m) {
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return { type: "send", isMeta: true, message: m };
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}
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function World(bootActions) {
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this.nextPid = 0;
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this.eventQueue = [];
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this.processTable = {};
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this.downwardRoutes = [];
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this.pendingActions = [];
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this.enqueueActions(-1, bootActions);
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}
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World.prototype.enqueueActions = function (pid, actions) {
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for (var i = 0; i < actions.length; i++) {
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this.pendingActions.push([pid, actions[i]]);
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}
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};
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World.prototype.boot = function () {
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this.performPendingActions();
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};
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World.prototype.performPendingActions = function () {
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var queue = this.pendingActions;
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this.pendingActions = [];
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var item;
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while ((item = queue.shift())) {
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this.performAction(item[0], item[1]);
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}
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};
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World.prototype.performAction = function (pid, action) {
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switch (action.type) {
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case "spawn":
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this.doSpawn(action.actor);
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break;
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case "routes":
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this.doRoutes(pid, action.routes);
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break;
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case "send":
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this.doSend(pid, action.isMeta, action.message);
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break;
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default:
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throw { message: "Action type " + action.type + " not understood",
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action: action };
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}
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};
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World.prototype.doSpawn = function (actor) {
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this.processTable[this.nextPid++] = actor;
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};
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World.prototype.handleEvent = function (e) {
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this.dispatchEvent(e);
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this.performPendingActions();
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};
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World.prototype.dispatchEvent = function (e) {
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switch (e.type) {
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case "routes":
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break;
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case "send":
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break;
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default:
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break;
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}
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};
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