refactor($resource): unify and simplify the code

angularFiles.js

@@ -5,7 +5,6 @@ angularFiles = {
     'src/AngularPublic.js',
     'src/JSON.js',
     'src/Injector.js',
-    'src/Resource.js',
     'src/jqLite.js',
     'src/apis.js',
     'src/service/anchorScroll.js',

src/service/resource.js

@@ -202,7 +202,167 @@
  */
 function $ResourceProvider() {
   this.$get = ['$http', function($http) {
-    var resource = new ResourceFactory($http);
-    return bind(resource, resource.route);
+    var DEFAULT_ACTIONS = {
+      'get':    {method:'GET'},
+      'save':   {method:'POST'},
+      'query':  {method:'GET', isArray:true},
+      'remove': {method:'DELETE'},
+      'delete': {method:'DELETE'}
+    };
+
+
+    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;
+        }
+      });
+      this.template = template.replace(/\\:/g, ':');
+    }
+
+    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(url, paramDefaults, actions) {
+      var route = new Route(url);
+
+      actions = extend({}, 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, a4) {
+          var params = {};
+          var data;
+          var success = noop;
+          var error = null;
+          switch(arguments.length) {
+          case 4:
+            error = a4;
+            success = a3;
+            //fallthrough
+          case 3:
+          case 2:
+            if (isFunction(a2)) {
+              if (isFunction(a1)) {
+                success = a1;
+                error = a2;
+                break;
+              }
+
+              success = a2;
+              error = a3;
+              //fallthrough
+            } else {
+              params = a1;
+              data = a2;
+              success = a3;
+              break;
+            }
+          case 1:
+            if (isFunction(a1)) success = a1;
+            else if (isPostOrPut) data = a1;
+            else params = a1;
+            break;
+          case 0: break;
+          default:
+            throw "Expected between 0-4 arguments [params, data, success, error], got " +
+              arguments.length + " arguments.";
+          }
+
+          var value = this instanceof Resource ? this : (action.isArray ? [] : new Resource(data));
+          $http({
+            method: action.method,
+            url: route.url(extend({}, extractParams(data), action.params || {}, params)),
+            data: data
+          }).then(function(response) {
+              var data = response.data;
+
+              if (data) {
+                if (action.isArray) {
+                  value.length = 0;
+                  forEach(data, function(item) {
+                    value.push(new Resource(item));
+                  });
+                } else {
+                  copy(data, value);
+                }
+              }
+              (success||noop)(value, response.headers);
+            }, error);
+
+          return value;
+        };
+
+
+        Resource.bind = function(additionalParamDefaults){
+          return ResourceFactory(url, extend({}, paramDefaults, additionalParamDefaults), actions);
+        };
+
+
+        Resource.prototype['$' + name] = function(a1, a2, a3) {
+          var params = extractParams(this),
+              success = noop,
+              error;
+
+          switch(arguments.length) {
+          case 3: params = a1; success = a2; error = a3; break;
+          case 2:
+          case 1:
+            if (isFunction(a1)) {
+              success = a1;
+              error = a2;
+            } else {
+              params = a1;
+              success = a2 || noop;
+            }
+          case 0: break;
+          default:
+            throw "Expected between 1-3 arguments [params, success, error], got " +
+              arguments.length + " arguments.";
+          }
+          var data = isPostOrPut ? this : undefined;
+          Resource[name].call(this, params, data, success, error);
+        };
+      });
+      return Resource;
+    }
+
+    return ResourceFactory;
   }];
 }