Add support the Content-Type based URI router

Add support the Content-Type based URI router

lib/router.js

@@ -1,6 +1,8 @@
 // router.js
+// Content-Type based URI router for WelsonJS framework
 // Namhyeon Go <abuse@catswords.net>
 // https://github.com/gnh1201/welsonjs
+//
 function RouteModel(path, callback) {
     this.path = path;
     this.callback = callback;
@@ -8,32 +10,84 @@ function RouteModel(path, callback) {
 
 function RouterObject() {
     var routes = [];
+    var renders = [];
 
-    this.render = function(filename, data) {};
-    this.setRender = function(render) {
-        this.render = render;
+    this.setRender = function(callback, contentType) {
+        var contentType = (typeof contentType !== "undefined" ?
+            contentType : ""
+        );
+
+        renders.push({
+            "contentType": contentType,
+            "callback": callback
+        });
     };
+
+    this.render = function(uri, data) {
+        // Use expression: data:application/json,%7B%22key%22%3A%22value%22%7D
+        // Use expression: data:text/html,%3Ch1%3EHello%3C%2Fh1%3E
+        // Use expression: /path/to/file.html
+        var contents = (function(uri, start, end) {
+            if (start > -1 && end > start) {
+                return [uri.substring(start, end), uri.substring(end + 1)];
+            }
+            
+            return ["", uri];
+        })(uri, uri.indexOf("data:"), uri.indexOf(','));
+
+        var contentType = contents[0];
+        var rawData = (contentType != "" ?
+            decodeURIComponent(contents[1]) : contents[1]
+        );
+        
+        // Multiple renderers are allowed for the same content type. They are executed in the order they were registered.
+        renders.forEach(function(x) {
+            if (x.contentType == contentType) {
+                try {
+                    if (typeof x.callback === "function") {
+                        x.callback(rawData, data);
+                    } else {
+                        console.warn("Failed to render content of type " + x.contentType, "Not a function");
+                    }
+                } catch (e) {
+                    console.warn("Failed to render content of type " + x.contentType, e.message);
+                }
+            }
+        });
+    };
+    
     this.add = function(path, callback) {
         routes.push(new RouteModel(path, callback));
     };
-    this.go = function(path) {
+    
+    this.go = function(uri) {
+        var path = uri.split(/[?#]/)[0]; 
+
         var model = routes.find(function(x) {
-            return (x.path == path);
+            return path === x.path || path.indexOf(x.path + "/") === 0;
         });
 
-        if (typeof model !== "undefined") {
-            //try {
-                model.callback(this.render);
-            //} catch (e) {
-            //    console.error(path, e.message);
-            //}
+        if (!model) {
+            console.error("No matching route found for:", uri);
+            return;
+        }
+
+        if (typeof model.callback !== "function") {
+            console.error("Invalid callback for route:", model.path);
+            return;
+        }
+
+        try {
+            model.callback(this.render);
+        } catch (e) {
+            console.error("Error executing callback for route:", model.path, "-", e.message);
         }
     };
 }
 
 exports.Router = new RouterObject();
 
-exports.VERSIONINFO = "URI Router (router.js) version 0.1.1";
+exports.VERSIONINFO = "Content-Type based URI router (router.js) version 0.1.2";
 exports.AUTHOR = "abuse@catswords.net";
 exports.global = global;
 exports.require = global.require;