DelegatingRouter.js

define(['backbone'],function(Backbone){
  // Modified from from Backbone.Router v 0.9.2
  var DelegatingRouter = function(args) {
    if (!args.delegate) { throw("delegate is required arg to DelegateRouter"); }
    if (!args.routes) { throw("routes is required arg to DelegateRouter"); }     
    Backbone.history || (Backbone.history = new Backbone.History);
  
    _delegate_routes(this, args.delegate, args.routes);
    // if (!Backbone.history.start({pushState: true})) {
    //   // window.location.href = "/404.html";
    // }
  }

  // Cached regular expressions for matching named param parts and splatted
  // parts of route strings.
  var named_param = /:\w+/g;
  var splat_param = /\*\w+/g;
  var escape_rx   = /[-[\]{}()+?.,\\^$|#\s]/g;

  function _str_to_rx(route) {
    route = route.replace(escape_rx, '\\$&')
                 .replace(named_param, '([^\/]+)')
                 .replace(splat_param, '(.*?)');
               
    return new RegExp('^' + route + '$');
  }

  function _delegate_routes(router, delegate, routes_map) {
    var routes = [];
    for (var route in routes_map) {
      routes.unshift([route, routes_map[route]]);
    }
    for (var i = 0, l = routes.length; i < l; i++) {
      var route = routes[i];
      var route_rx = _str_to_rx(route[0]);
      var route_name = route[1];
      _delegate_route(router, delegate, route_rx, route_name);
    }
  }

  function _delegate_route(router, delegate, route_rx, route_name) {
    var callback = delegate[route_name];

    var route_matcher = function(path) {
      var args = route_rx.exec(path).slice(1);
      callback.apply(delegate, args);
      router.trigger.apply(router, ['route:' + route_name].concat(args));
      Backbone.history.trigger('route', this, route_name, args);
    }

    Backbone.history.route(route_rx, route_matcher);
  }

  _.extend(DelegatingRouter.prototype, Backbone.Events, {
    // Simple proxy to `Backbone.history` to save a fragment into the history.
    start: function(){
      Backbone.history.start({pushState: true});
    },
    navigate: function(fragment, options) {
      Backbone.history.navigate(fragment, options);
    }
  });
  
  return DelegatingRouter;
});

example.coffee

class Client
  constructor:()->
    @router = new DelegateRouter(
      delegate: this
      routes: 
        "barf/:something": "barf"
        "barfed/:one/:two": "barfed"
        "": "index"
        ":all": "all"
    )
  
  barf: (something)->
  barfed: (one, two)->
  index: ()->

example.js

function Delegate(routes) {
  this.router = new DelegatingRouter({
    delegate: this,
    routes: routes
  });
}

Delegate.prototype.barf = function(something) { console.log(["barf", something]); };
Delegate.prototype.barfed = function(one, two) { console.log(["barfed", one, two]) };
Delegate.prototype.index = function() { console.log("index"); };

new Delegate({
  "barf/:something": "barf",
  "barfed/:one/:two": "barfed",
  "": "index"
});