Backtrace.js

(function() {

  Backtrace = {};

  Backtrace.Router = (function() {

    Router.prototype.optionalParam = /\((.*?)\)/g;

    Router.prototype.namedParam = /:\w+/g;

    Router.prototype.splatParam = /\*\w+/g;

    Router.prototype.escapeRegExp = /[-{}[\]+?.,\\^$|#\s]/g;

    Router.prototype.rootURL = "";

    Router.prototype.routes = {
    };

    function Router() {
      this.initialize.apply(this);
      this.execRoute();
      return this;
    }

    Router.prototype.initialize = function() {};

    Router.prototype.routeToRegExp = function(route) {
      route = route.replace(this.escapeRegExp, '\\$&').replace(this.optionalParam, '(?:$1)?').replace(this.namedParam, '([^\/]+)').replace(this.splatParam, '(.*?)');
      return new RegExp('^' + route + '$');
    };

    Router.prototype.execRoute = function() {
      var path, route, _results;
      path = window.location.pathname.substring(this.rootURL.length+1);
      _results = [];
      for (route in this.routes) {
        if (this.routeToRegExp(route).test(path)) {
          var args = this._extractParameters(this.routeToRegExp(route), path);
          this[this.routes[route]].apply(this,args);
        }
      }
    };

    Router.prototype._extractParameters = function(route, fragment) {
      var params = route.exec(fragment).slice(1);
      return _.map(params, function(param) {
        return param ? decodeURIComponent(param) : null;
      });
    };

    return Router;

  })();

}).call(this);
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