351 lines
9.7 KiB
JavaScript
351 lines
9.7 KiB
JavaScript
define("dojo/router/RouterBase", [
|
|
"dojo/_base/declare",
|
|
"dojo/hash",
|
|
"dojo/topic"
|
|
], function(declare, hash, topic){
|
|
|
|
// module:
|
|
// dojo/router/RouterBase
|
|
|
|
// Creating a basic trim to avoid needing the full dojo/string module
|
|
// similarly to dojo/_base/lang's trim
|
|
var trim;
|
|
if(String.prototype.trim){
|
|
trim = function(str){ return str.trim(); };
|
|
}else{
|
|
trim = function(str){ return str.replace(/^\s\s*/, '').replace(/\s\s*$/, ''); };
|
|
}
|
|
|
|
// Firing of routes on the route object is always the same,
|
|
// no clean way to expose this on the prototype since it's for the
|
|
// internal router objects.
|
|
function fireRoute(params, currentPath, newPath){
|
|
var queue, isStopped, isPrevented, eventObj, i, l;
|
|
|
|
queue = this.callbackQueue;
|
|
isStopped = false;
|
|
isPrevented = false;
|
|
eventObj = {
|
|
stopImmediatePropagation: function(){ isStopped = true; },
|
|
preventDefault: function(){ isPrevented = true; },
|
|
oldPath: currentPath,
|
|
newPath: newPath,
|
|
params: params
|
|
};
|
|
|
|
for(i=0, l=queue.length; i<l; ++i){
|
|
if(!isStopped){
|
|
queue[i](eventObj);
|
|
}
|
|
}
|
|
|
|
return !isPrevented;
|
|
}
|
|
|
|
// Our actual class-like object
|
|
var RouterBase = declare(null, {
|
|
// summary:
|
|
// A module that allows one to easily map hash-based structures into
|
|
// callbacks. The router module is a singleton, offering one central
|
|
// point for all registrations of this type.
|
|
// example:
|
|
// | var router = new RouterBase({});
|
|
// | router.register("/widgets/:id", function(evt){
|
|
// | // If "/widgets/3" was matched,
|
|
// | // evt.params.id === "3"
|
|
// | xhr.get({
|
|
// | url: "/some/path/" + evt.params.id,
|
|
// | load: function(data){
|
|
// | // ...
|
|
// | }
|
|
// | });
|
|
// | });
|
|
|
|
_routes: null,
|
|
_routeIndex: null,
|
|
_started: false,
|
|
_currentPath: "",
|
|
|
|
idMatch: /:(\w[\w\d]*)/g,
|
|
idReplacement: "([^\\/]+)",
|
|
globMatch: /\*(\w[\w\d]*)/,
|
|
globReplacement: "(.+)",
|
|
|
|
constructor: function(kwArgs){
|
|
// A couple of safety initializations
|
|
this._routes = [];
|
|
this._routeIndex = {};
|
|
|
|
// Simple constructor-style "Decorate myself all over" for now
|
|
for(var i in kwArgs){
|
|
if(kwArgs.hasOwnProperty(i)){
|
|
this[i] = kwArgs[i];
|
|
}
|
|
}
|
|
},
|
|
|
|
register: function(/*String|RegExp*/ route, /*Function*/ callback){
|
|
// summary:
|
|
// Registers a route to a handling callback
|
|
// description:
|
|
// Given either a string or a regular expression, the router
|
|
// will monitor the page's hash and respond to changes that
|
|
// match the string or regex as provided.
|
|
//
|
|
// When provided a regex for the route:
|
|
//
|
|
// - Matching is performed, and the resulting capture groups
|
|
// are passed through to the callback as an array.
|
|
//
|
|
// When provided a string for the route:
|
|
//
|
|
// - The string is parsed as a URL-like structure, like
|
|
// "/foo/bar"
|
|
// - If any portions of that URL are prefixed with a colon
|
|
// (:), they will be parsed out and provided to the callback
|
|
// as properties of an object.
|
|
// - If the last piece of the URL-like structure is prefixed
|
|
// with a star (*) instead of a colon, it will be replaced in
|
|
// the resulting regex with a greedy (.+) match and
|
|
// anything remaining on the hash will be provided as a
|
|
// property on the object passed into the callback. Think of
|
|
// it like a basic means of globbing the end of a route.
|
|
// example:
|
|
// | router.register("/foo/:bar/*baz", function(object){
|
|
// | // If the hash was "/foo/abc/def/ghi",
|
|
// | // object.bar === "abc"
|
|
// | // object.baz === "def/ghi"
|
|
// | });
|
|
// returns: Object
|
|
// A plain JavaScript object to be used as a handle for
|
|
// either removing this specific callback's registration, as
|
|
// well as to add new callbacks with the same route initially
|
|
// used.
|
|
// route: String|RegExp
|
|
// A string or regular expression which will be used when
|
|
// monitoring hash changes.
|
|
// callback: Function
|
|
// When the hash matches a pattern as described in the route,
|
|
// this callback will be executed. It will receive an event
|
|
// object that will have several properties:
|
|
//
|
|
// - params: Either an array or object of properties pulled
|
|
// from the new hash
|
|
// - oldPath: The hash in its state before the change
|
|
// - newPath: The new hash being shifted to
|
|
// - preventDefault: A method that will stop hash changes
|
|
// from being actually applied to the active hash. This only
|
|
// works if the hash change was initiated using `router.go`,
|
|
// as changes initiated more directly to the location.hash
|
|
// property will already be in place
|
|
// - stopImmediatePropagation: When called, will stop any
|
|
// further bound callbacks on this particular route from
|
|
// being executed. If two distinct routes are bound that are
|
|
// different, but both happen to match the current hash in
|
|
// some way, this will *not* keep other routes from receiving
|
|
// notice of the change.
|
|
|
|
return this._registerRoute(route, callback);
|
|
},
|
|
|
|
registerBefore: function(/*String|RegExp*/ route, /*Function*/ callback){
|
|
// summary:
|
|
// Registers a route to a handling callback, except before
|
|
// any previously registered callbacks
|
|
// description:
|
|
// Much like the `register` method, `registerBefore` allows
|
|
// us to register route callbacks to happen before any
|
|
// previously registered callbacks. See the documentation for
|
|
// `register` for more details and examples.
|
|
|
|
return this._registerRoute(route, callback, true);
|
|
},
|
|
|
|
go: function(path, replace){
|
|
// summary:
|
|
// A simple pass-through to make changing the hash easy,
|
|
// without having to require dojo/hash directly. It also
|
|
// synchronously fires off any routes that match.
|
|
// example:
|
|
// | router.go("/foo/bar");
|
|
|
|
var applyChange;
|
|
|
|
path = trim(path);
|
|
applyChange = this._handlePathChange(path);
|
|
|
|
if(applyChange){
|
|
hash(path, replace);
|
|
}
|
|
|
|
return applyChange;
|
|
},
|
|
|
|
startup: function(){
|
|
// summary:
|
|
// This method must be called to activate the router. Until
|
|
// startup is called, no hash changes will trigger route
|
|
// callbacks.
|
|
|
|
if(this._started){ return; }
|
|
|
|
var self = this;
|
|
|
|
this._started = true;
|
|
this._handlePathChange(hash());
|
|
topic.subscribe("/dojo/hashchange", function(){
|
|
// No need to load all of lang for just this
|
|
self._handlePathChange.apply(self, arguments);
|
|
});
|
|
},
|
|
|
|
_handlePathChange: function(newPath){
|
|
var i, j, li, lj, routeObj, result,
|
|
allowChange, parameterNames, params,
|
|
routes = this._routes,
|
|
currentPath = this._currentPath;
|
|
|
|
if(!this._started || newPath === currentPath){ return allowChange; }
|
|
|
|
allowChange = true;
|
|
|
|
for(i=0, li=routes.length; i<li; ++i){
|
|
routeObj = routes[i];
|
|
result = routeObj.route.exec(newPath);
|
|
|
|
if(result){
|
|
if(routeObj.parameterNames){
|
|
parameterNames = routeObj.parameterNames;
|
|
params = {};
|
|
|
|
for(j=0, lj=parameterNames.length; j<lj; ++j){
|
|
params[parameterNames[j]] = result[j+1];
|
|
}
|
|
}else{
|
|
params = result.slice(1);
|
|
}
|
|
allowChange = routeObj.fire(params, currentPath, newPath);
|
|
}
|
|
}
|
|
|
|
if(allowChange){
|
|
this._currentPath = newPath;
|
|
}
|
|
|
|
return allowChange;
|
|
},
|
|
|
|
_convertRouteToRegExp: function(route){
|
|
// Sub in based on IDs and globs
|
|
route = route.replace(this.idMatch, this.idReplacement);
|
|
route = route.replace(this.globMatch, this.globReplacement);
|
|
// Make sure it's an exact match
|
|
route = "^" + route + "$";
|
|
|
|
return new RegExp(route);
|
|
},
|
|
|
|
_getParameterNames: function(route){
|
|
var idMatch = this.idMatch,
|
|
globMatch = this.globMatch,
|
|
parameterNames = [], match;
|
|
|
|
idMatch.lastIndex = 0;
|
|
|
|
while((match = idMatch.exec(route)) !== null){
|
|
parameterNames.push(match[1]);
|
|
}
|
|
if((match = globMatch.exec(route)) !== null){
|
|
parameterNames.push(match[1]);
|
|
}
|
|
|
|
return parameterNames.length > 0 ? parameterNames : null;
|
|
},
|
|
|
|
_indexRoutes: function(){
|
|
var i, l, route, routeIndex, routes = this._routes;
|
|
|
|
// Start a new route index
|
|
routeIndex = this._routeIndex = {};
|
|
|
|
// Set it up again
|
|
for(i=0, l=routes.length; i<l; ++i){
|
|
route = routes[i];
|
|
routeIndex[route.route] = i;
|
|
}
|
|
},
|
|
|
|
_registerRoute: function(/*String|RegExp*/route, /*Function*/callback, /*Boolean?*/isBefore){
|
|
var index, exists, routeObj, callbackQueue, removed,
|
|
self = this, routes = this._routes,
|
|
routeIndex = this._routeIndex;
|
|
|
|
// Try to fetch the route if it already exists.
|
|
// This works thanks to stringifying of regex
|
|
index = this._routeIndex[route];
|
|
exists = typeof index !== "undefined";
|
|
if(exists){
|
|
routeObj = routes[index];
|
|
}
|
|
|
|
// If we didn't get one, make a default start point
|
|
if(!routeObj){
|
|
routeObj = {
|
|
route: route,
|
|
callbackQueue: [],
|
|
fire: fireRoute
|
|
};
|
|
}
|
|
|
|
callbackQueue = routeObj.callbackQueue;
|
|
|
|
if(typeof route == "string"){
|
|
routeObj.parameterNames = this._getParameterNames(route);
|
|
routeObj.route = this._convertRouteToRegExp(route);
|
|
}
|
|
|
|
if(isBefore){
|
|
callbackQueue.unshift(callback);
|
|
}else{
|
|
callbackQueue.push(callback);
|
|
}
|
|
|
|
if(!exists){
|
|
index = routes.length;
|
|
routeIndex[route] = index;
|
|
routes.push(routeObj);
|
|
}
|
|
|
|
// Useful in a moment to keep from re-removing routes
|
|
removed = false;
|
|
|
|
return { // Object
|
|
remove: function(){
|
|
var i, l;
|
|
|
|
if(removed){ return; }
|
|
|
|
for(i=0, l=callbackQueue.length; i<l; ++i){
|
|
if(callbackQueue[i] === callback){
|
|
callbackQueue.splice(i, 1);
|
|
}
|
|
}
|
|
|
|
|
|
if(callbackQueue.length === 0){
|
|
routes.splice(index, 1);
|
|
self._indexRoutes();
|
|
}
|
|
|
|
removed = true;
|
|
},
|
|
register: function(callback, isBefore){
|
|
return self.register(route, callback, isBefore);
|
|
}
|
|
};
|
|
}
|
|
});
|
|
|
|
return RouterBase;
|
|
});
|