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railway_routes.js
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railway_routes.js
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var singularize = require('./inflection').singularize;
exports.Map = Map;
function Map(app, bridge) {
this.app = app;
this.bridge = bridge;
this.paths = [];
this.ns = '';
// wtf???
this.globPath = '/';
this.pathTo = {};
this.dump = [];
this.middlewareStack = [];
}
Map.prototype.urlHelperName = function (path, action) {
if (path instanceof RegExp) {
path = path.toString().replace(/[^a-z]+/ig, '/');
}
// remove trailing slashes and split to parts
path = path.replace(/^\/|\/$/g, '').split('/');
// handle root paths
if (path === '' || path === '/') return 'root';
var helperName = [];
path.forEach(function (token, index, all) {
// skip variables
if (token[0] == ':') return;
var nextToken = all[index + 1] || '';
// current token is last?
if (index == all.length - 1) {
token = token.replace(/\.:format\??$/, '');
// same as action? - prepend
if (token == action) {
helperName.unshift(token);
return;
}
}
if (nextToken[0] == ':' || nextToken == 'new.:format?') {
token = singularize(token);
}
helperName.push(token);
});
return helperName.join('_');
};
['get', 'post', 'put', 'delete', 'del', 'all'].forEach(function (method) {
Map.prototype[method] = function (subpath, handler, middleware, options) {
var controller, action;
if (typeof handler === 'string') {
controller = handler.split('#')[0];
action = handler.split('#')[1];
}
var path;
if (typeof subpath === 'string') {
path = this.globPath + subpath.replace(/^\/|\/$/, '');
} else { // regex???
path = subpath;
}
// only accept functions in before filter when it's an array
if (middleware instanceof Array) {
var before_filter_functions = middleware.filter(function(filter) {
return (typeof filter === 'function');
});
middleware = before_filter_functions.length > 0 ? before_filter_functions : null;
}
if (!(typeof middleware === 'function' || (middleware instanceof Array)) && typeof options === 'undefined') {
options = middleware;
middleware = null;
}
if (!options) {
options = {};
}
path = options.collection ? path.replace(/\/:.*_id/, '') : path;
var args = [path];
if (middleware) {
args = args.concat(this.middlewareStack.concat(middleware));
}
args = args.concat(this.bridge(this.ns, controller, action));
this.dump.push({
helper: options.as || this.urlHelperName(path, action),
method: method,
path: path,
file: this.ns + controller,
name: controller,
action: action
});
this.addPath(path, action);
this.app[method].apply(this.app, args);
};
});
Map.prototype.addPath = function (templatePath, action) {
if (templatePath instanceof RegExp) {
// TODO: think about adding to `path_to` routes by reg ex
return;
}
var paramsLength = templatePath.match(/\/:/g);
paramsLength = paramsLength === null ? 0 : paramsLength.length;
var helperName = this.urlHelperName(templatePath, action);
// already defined? not need to redefine
if (this.pathTo[helperName]) return;
this.pathTo[helperName] = function () {
if (arguments.length < paramsLength) {
return '';
// throw new Error('Expected at least ' + paramsLength + ' params for build path ' + templatePath + ' but only ' + arguments.length + ' passed');
}
var value, arg, path = templatePath;
for (var i = 0; i < paramsLength; i += 1) {
value = null;
arg = arguments[i];
if (arg && typeof arg.to_param == 'function') {
value = arg.to_param();
} else if (arg && arg.id) {
value = arg.id;
} else {
value = arg;
}
path = path.replace(/:\w*/, value);
}
if (arguments[paramsLength]) {
var query = [];
for (var key in arguments[paramsLength]) {
if (key == 'format' && path.match(/\.:format\??$/)) {
path = path.replace(/\.:format\??$/, '.' + arguments[paramsLength][key]);
} else {
query.push(key + '=' + arguments[paramsLength][key]);
}
}
if (query.length) {
path += '?' + query.join('&');
}
}
path = path.replace(/\.:format\?/, '');
// add ability to hook url handling via app
if (this.app.hooks && this.app.hooks.path) {
this.app.hooks.path.forEach(function (hook) {
path = hook(path);
});
}
return path;
}.bind(this);
this.pathTo[helperName].toString = function () {
return this.pathTo[helperName]();
}.bind(this);
}
Map.prototype.resources = function (name, params, actions) {
var self = this;
// params are optional
params = params || {};
// if params arg omitted, second arg may be `actions`
if (typeof params == 'function') {
actions = params;
params = {};
}
// we have bunch of actions here, will create routes for them
var activeRoutes = getActiveRoutes(params);
// but first, create subroutes
if (typeof actions == 'function') {
this.subroutes(name + '/:' + (singularize(name) || name) + '_id', actions);
}
// now let's walk through action routes
for (var action in activeRoutes) {
(function (action) {
var route = activeRoutes[action].split(/\s+/);
var method = route[0];
var path = route[1];
// append format
if (path == '/') {
path = '.:format?';
} else {
path += '.:format?';
}
// middleware logic (backward compatibility)
var middlewareExcept = params.middlewareExcept, skipMiddleware = false;
if (middlewareExcept) {
if (typeof middlewareExcept == 'string') {
middlewareExcept = [middlewareExcept];
}
middlewareExcept.forEach(function (a) {
if (a == action) {
skipMiddleware = true;
}
});
}
// params.path setting allows to override common path component
var effectivePath = (params.path || name) + path;
// and call map.{get|post|update|delete}
// with the path, controller, middleware and options
this[method.toLowerCase()].call(
this,
effectivePath,
name + '#' + action,
skipMiddleware ? [] : params.middleware,
getParams(action, params)
);
}.bind(this))(action);
}
// calculate set of routes based on params.only and params.except
function getActiveRoutes(params) {
var activeRoutes = {},
availableRoutes =
{ 'index': 'GET /'
, 'create': 'POST /'
, 'new': 'GET /new'
, 'edit': 'GET /:id/edit'
, 'destroy': 'DELETE /:id'
, 'update': 'PUT /:id'
, 'show': 'GET /:id'
};
// 1. only
if (params.only) {
if (typeof params.only == 'string') {
params.only = [params.only];
}
params.only.forEach(function (action) {
if (action in availableRoutes) {
activeRoutes[action] = availableRoutes[action];
}
});
}
// 2. except
else if (params.except) {
if (typeof params.except == 'string') {
params.except = [params.except];
}
for (var action in availableRoutes) {
if (params.except.indexOf(action) == -1) {
activeRoutes[action] = availableRoutes[action];
}
}
}
// 3. all
else {
for (var action in availableRoutes) {
activeRoutes[action] = availableRoutes[action];
}
}
return activeRoutes;
}
function getParams(action, params) {
var p = {};
var plural = action === 'index' || action === 'create';
if (params.as) {
p.as = plural ? params.as : singularize(params.as);
p.as = self.urlHelperName(self.globPath + p.as);
if (action === 'new' || action === 'edit') {
p.as = action + '_' + p.as;
}
}
if (params.path && !p.as) {
var aname = plural ? name : singularize(name);
aname = self.urlHelperName(self.globPath + aname);
p.as = action === 'new' || action === 'edit' ? action + '_' + aname : aname;
}
return p;
}
};
Map.prototype.namespace = function (name, options, subroutes) {
if (typeof options === 'function') {
subroutes = options;
options = null;
}
if (options && typeof options.middleware === 'function') {
options.middleware = [options.middleware];
}
// store previous ns
var old_ns = this.ns, oldGlobPath = this.globPath;
// add new ns to old (ensure tail slash present)
this.ns = old_ns + name.replace(/\/$/, '') + '/';
this.globPath = oldGlobPath + name.replace(/\/$/, '') + '/';
if (options && options.middleware) {
this.middlewareStack = this.middlewareStack.concat(options.middleware);
}
subroutes(this);
if (options && options.middleware) {
options.middleware.forEach([].pop.bind(this.middlewareStack));
}
this.ns = old_ns;
this.globPath = oldGlobPath;
};
Map.prototype.subroutes = function (name, subroutes) {
// store previous ns
var oldGlobPath = this.globPath;
// add new ns to old (ensure tail slash present)
this.globPath = oldGlobPath + name.replace(/\/$/, '') + '/';
subroutes(this);
this.globPath = oldGlobPath;
};