refactor: move angular source to /packages rather than modules/@angular

packages/forms/src/directives/number_value_accessor.ts

@@ -0,0 +1,58 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Directive, ElementRef, Renderer, forwardRef} from '@angular/core';
+
+import {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';
+
+export const NUMBER_VALUE_ACCESSOR: any = {
+  provide: NG_VALUE_ACCESSOR,
+  useExisting: forwardRef(() => NumberValueAccessor),
+  multi: true
+};
+
+/**
+ * The accessor for writing a number value and listening to changes that is used by the
+ * {@link NgModel}, {@link FormControlDirective}, and {@link FormControlName} directives.
+ *
+ *  ### Example
+ *  ```
+ *  <input type="number" [(ngModel)]="age">
+ *  ```
+ */
+@Directive({
+  selector:
+      'input[type=number][formControlName],input[type=number][formControl],input[type=number][ngModel]',
+  host: {
+    '(change)': 'onChange($event.target.value)',
+    '(input)': 'onChange($event.target.value)',
+    '(blur)': 'onTouched()'
+  },
+  providers: [NUMBER_VALUE_ACCESSOR]
+})
+export class NumberValueAccessor implements ControlValueAccessor {
+  onChange = (_: any) => {};
+  onTouched = () => {};
+
+  constructor(private _renderer: Renderer, private _elementRef: ElementRef) {}
+
+  writeValue(value: number): void {
+    // The value needs to be normalized for IE9, otherwise it is set to 'null' when null
+    const normalizedValue = value == null ? '' : value;
+    this._renderer.setElementProperty(this._elementRef.nativeElement, 'value', normalizedValue);
+  }
+
+  registerOnChange(fn: (_: number) => void): void {
+    this.onChange = (value) => { fn(value == '' ? null : parseFloat(value)); };
+  }
+  registerOnTouched(fn: () => void): void { this.onTouched = fn; }
+
+  setDisabledState(isDisabled: boolean): void {
+    this._renderer.setElementProperty(this._elementRef.nativeElement, 'disabled', isDisabled);
+  }
+}