Changed tweets, added eca

template_static/lib/core.js

@@ -0,0 +1,105 @@
+/*
+Event stream handling.
+
+See https://developer.mozilla.org/en-US/docs/Web/API/EventSource for a more
+comprehensive explanation.
+*/
+
+events = {};
+
+(function($, exports) {
+    var e = new EventSource('/events');
+
+    exports.connect = function(name, elements) {
+        // wrap to allow selector, jQuery object and DOM nodes
+        var $elements = $(elements);
+
+        // add listener that triggers events in DOM
+        this.listen(name, function(message) {
+            $elements.trigger('server-event', [message]);
+        });
+    };
+
+    exports.listen = function(name, callback) {
+        // add event listener to event stream
+        e.addEventListener(name, function(m) {
+            try {
+                var message = JSON.parse(m.data);
+            } catch(err) {
+                console.exception("Received malformed message: ",err);
+                return;
+            }
+
+            callback(message);
+        });
+    };
+})(jQuery, events);
+
+/*
+** Block fucntion allows for quick creation of new block types.
+*/
+(function($) {
+    var ConstructionState = function($element) {
+        this.$element = $element;
+
+        // transfer all block constructors to scope
+        for(var b in block.fn) {
+            // prevent overrides
+            if(!(b in this)) {
+                // reference block type in this object
+                this[b] = block.fn[b];
+            }
+        }
+    };
+
+    ConstructionState.prototype.actions = function(actions_or_def, def) {
+        // handle function overloading
+        if(typeof actions_or_def == 'function') {
+            def = actions_or_def;
+            actions = {};
+        } else {
+            actions = actions_or_def;
+        }
+
+        // default actionless handler
+        if(typeof def == 'undefined') {
+            def = function(e, message) {
+                console.error("Received actionless server event." +
+                              " Did you forget to set an action field?");
+            }
+        }
+
+        // dispatch all incoming server events
+        this.$element.on('server-event', function(e, message) {
+            if(!('action' in message)) {
+                $(this).trigger('_default.server-event', [message]);
+            } else {
+                $(this).trigger(message.action+'.server-event', [message]);
+            }
+        });
+
+        // bind all actions
+        this.$element.on('_default.server-event', def);
+
+        for(var k in actions) {
+            this.$element.on(k+'.server-event', actions[k]);
+        }
+
+    }
+
+    block = function(elements) {
+        // allow passing of selectors, jquery objects and DOM nodes
+        var $element = $(elements);
+
+        // actual work
+        if($element.length != 1) {
+            console.error("Must have one element to create block for." +
+                          " Was given: '",elements,"'");
+            return;
+        } 
+
+        return new ConstructionState($element);
+    }
+
+    block.fn = {};
+})(jQuery);