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Resource.js

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function Route(template, defaults) {

this.template = template = template + '#';

this.defaults = defaults || {};

var urlParams = this.urlParams = {};

forEach(template.split(/\W/), function(param){

if (param && template.match(new RegExp(":" + param + "\\W"))) {

urlParams[param] = true;

}

});

}

Route.prototype = {

url: function(params) {

var self = this,

url = this.template,

encodedVal;

params = params || {};

forEach(this.urlParams, function(_, urlParam){

encodedVal = encodeUriSegment(params[urlParam] || self.defaults[urlParam] || "");

url = url.replace(new RegExp(":" + urlParam + "(\\W)"), encodedVal + "$1");

});

url = url.replace(/\/?#$/, '');

var query = [];

forEachSorted(params, function(value, key){

if (!self.urlParams[key]) {

query.push(encodeUriQuery(key) + '=' + encodeUriQuery(value));

}

});

url = url.replace(/\/*$/, '');

return url + (query.length ? '?' + query.join('&') : '');

}

};

function ResourceFactory(xhr) {

this.xhr = xhr;

}

ResourceFactory.DEFAULT_ACTIONS = {

'get': {method:'GET'},

'save': {method:'POST'},

'query': {method:'GET', isArray:true},

'remove': {method:'DELETE'},

'delete': {method:'DELETE'}

};

ResourceFactory.prototype = {

route: function(url, paramDefaults, actions){

var self = this;

var route = new Route(url);

actions = extend({}, ResourceFactory.DEFAULT_ACTIONS, actions);

function extractParams(data){

var ids = {};

forEach(paramDefaults || {}, function(value, key){

ids[key] = value.charAt && value.charAt(0) == '@' ? getter(data, value.substr(1)) : value;

});

return ids;

}

function Resource(value){

copy(value || {}, this);

}

forEach(actions, function(action, name){

var isPostOrPut = action.method == 'POST' || action.method == 'PUT';

Resource[name] = function (a1, a2, a3) {

var params = {};

var data;

var callback = noop;

switch(arguments.length) {

case 3: callback = a3;

case 2:

if (isFunction(a2)) {

callback = a2;

//fallthrough

} else {

params = a1;

data = a2;

break;

}

case 1:

if (isFunction(a1)) callback = a1;

else if (isPostOrPut) data = a1;

else params = a1;

break;

case 0: break;

default:

throw "Expected between 0-3 arguments [params, data, callback], got " + arguments.length + " arguments.";

}

var value = this instanceof Resource ? this : (action.isArray ? [] : new Resource(data));

self.xhr(

action.method,

route.url(extend({}, action.params || {}, extractParams(data), params)),

data,

function(status, response, clear) {

if (200 <= status && status < 300) {

if (response) {

if (action.isArray) {

value.length = 0;

forEach(response, function(item){

value.push(new Resource(item));

});

} else {

copy(response, value);

}

}

(callback||noop)(value);

} else {

throw {status: status, response:response, message: status + ": " + response};

}

},

action.verifyCache);

return value;

};

Resource.bind = function(additionalParamDefaults){

return self.route(url, extend({}, paramDefaults, additionalParamDefaults), actions);

};

Resource.prototype['$' + name] = function(a1, a2){

var params = extractParams(this);

var callback = noop;

switch(arguments.length) {

case 2: params = a1; callback = a2;

case 1: if (typeof a1 == $function) callback = a1; else params = a1;

case 0: break;

default:

throw "Expected between 1-2 arguments [params, callback], got " + arguments.length + " arguments.";

}

var data = isPostOrPut ? this : undefined;

Resource[name].call(this, params, data, callback);

};

});

return Resource;

}

};