Initial commit

node_modules/hbs/lib/async.js

@@ -0,0 +1,107 @@
+/// provides the async helper functionality
+
+function Waiter() {
+    if (!(this instanceof Waiter)) {
+        return new Waiter();
+    }
+
+    var self = this;
+
+    // found values
+    self.values = {};
+
+    // callback when done
+    self.callback = null;
+
+    self.resolved = false;
+
+    self.count = 0;
+};
+
+Waiter.prototype.wait = function() {
+    var self = this;
+    ++self.count;
+};
+
+// resolve the promise
+Waiter.prototype.resolve = function(name, val) {
+    var self = this;
+
+    self.values[name] = val;
+
+    // done with all items
+    if (--self.count === 0) {
+        self.resolved = true;
+
+        // we may not have a done callback yet
+        if (self.callback) {
+            self.callback(self.values);
+        }
+    }
+};
+
+// sets the done callback for the waiter
+// notifies when the promise is complete
+Waiter.prototype.done = function(fn) {
+    var self = this;
+
+    self.callback = fn;
+    if (self.resolved) {
+        fn(self.values);
+    }
+};
+
+var alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_';
+
+var gen_id = function() {
+    var res = '';
+    for (var i=0 ; i<8 ; ++i) {
+        res += alphabet[Math.floor(Math.random() * alphabet.length)];
+    }
+
+    return res;
+};
+
+module.exports = function() {
+    // baton which contains the current
+    // set of deferreds
+    var waiter;
+
+    var obj = Object.create(null);
+    obj.done = function done(fn) {
+        // no async things called
+        if (!waiter) {
+            return fn({});
+        }
+
+        waiter.done(fn);
+
+        // clear the waiter for the next template
+        waiter = undefined;
+    };
+
+    obj.resolve = function resolve(fn, args) {
+        // we want to do async things, need a waiter for that
+        if (!waiter) {
+            waiter = new Waiter();
+        }
+
+        var id = '__' + gen_id() + '__';
+
+        var cur_waiter = waiter;
+        waiter.wait();
+
+        args = [].slice.call(args);
+        args.push(function(res) {
+            cur_waiter.resolve(id, res);
+        })
+
+        fn.apply(null, args);
+
+        // return the id placeholder
+        // this will be replaced later
+        return id;
+    };
+
+    return obj;
+};