feat(forms): add form builder

modules/angular2/src/forms/form_builder.js

@@ -0,0 +1,48 @@
+import {StringMapWrapper, ListWrapper} from 'angular2/src/facade/collection';
+import {isPresent} from 'angular2/src/facade/lang';
+import {ControlGroup, Control, OptionalControl, OptionalControlGroup} from 'angular2/forms';
+
+
+export class FormBuilder {
+  group(controlsConfig, extra = null):ControlGroup {
+    var controls = this._reduceControls(controlsConfig);
+    var optionals = isPresent(extra) ? StringMapWrapper.get(extra, "optionals") : null;
+    var validator = isPresent(extra) ? StringMapWrapper.get(extra, "validator") : null;
+
+    if (isPresent(validator)) {
+      return new ControlGroup(controls, optionals, validator);
+    } else {
+      return new ControlGroup(controls, optionals);
+    }
+  }
+
+  control(value, validator:Function = null):Control {
+    if (isPresent(validator)) {
+      return new Control(value, validator);
+    } else {
+      return new Control(value);
+    }
+  }
+
+  _reduceControls(controlsConfig) {
+    var controls = {};
+    StringMapWrapper.forEach(controlsConfig, (controlConfig, controlName) => {
+      controls[controlName] = this._createControl(controlConfig);
+    });
+    return controls;
+  }
+
+  _createControl(controlConfig) {
+    if (controlConfig instanceof Control || controlConfig instanceof ControlGroup) {
+      return controlConfig;
+
+    } else if (ListWrapper.isList(controlConfig)) {
+      var value = ListWrapper.get(controlConfig, 0);
+      var validator = controlConfig.length > 1 ? controlConfig[1] : null;
+      return this.control(value, validator);
+
+    } else {
+      return this.control(controlConfig);
+    }
+  }
+}

modules/angular2/test/forms/form_builder_spec.js

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+import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach, el} from 'angular2/test_lib';
+import {Control, FormBuilder} from 'angular2/forms';
+import * as validations from 'angular2/forms';
+
+export function main() {
+  describe("Form Builder", () => {
+    var b;
+
+    beforeEach(() => {
+      b = new FormBuilder();
+    });
+
+    it("should create controls from a value", () => {
+      var g = b.group({
+        "login": "some value"
+      });
+
+      expect(g.controls["login"].value).toEqual("some value");
+    });
+
+    it("should create controls from an array", () => {
+      var g = b.group({
+        "login": ["some value"],
+        "password": ["some value", validations.required]
+      });
+
+      expect(g.controls["login"].value).toEqual("some value");
+      expect(g.controls["password"].value).toEqual("some value");
+      expect(g.controls["password"].validator).toEqual(validations.required);
+    });
+
+    it("should use controls", () => {
+      var g = b.group({
+        "login": b.control("some value", validations.required)
+      });
+
+      expect(g.controls["login"].value).toEqual("some value");
+      expect(g.controls["login"].validator).toBe(validations.required);
+    });
+
+    it("should create groups with optional controls", () => {
+      var g = b.group({
+        "login": "some value"
+      }, {"optionals": {"login" : false}});
+
+      expect(g.contains("login")).toEqual(false);
+    });
+
+    it("should create groups with a custom validator", () => {
+      var g = b.group({
+        "login": "some value"
+      }, {"validator": validations.nullValidator});
+
+      expect(g.validator).toBe(validations.nullValidator);
+    });
+
+    it("should use default validators when no validators are provided", () => {
+      var g = b.group({
+        "login": "some value"
+      });
+      expect(g.controls["login"].validator).toBe(validations.nullValidator);
+      expect(g.validator).toBe(validations.controlGroupValidator);
+    });
+  });
+}