feat(common): support loading locales from a global

To support compile time localization, we need to be
able to provide the locales via a well known global property.

This commit changes `getLocaleData()` so that it will attempt
to read the local from the global `ng.common.locale` if the
locale has not already been registered via `registerLocaleData()`.

packages/core/src/i18n/locale_data_api.ts

@@ -8,6 +8,7 @@
 
 import {LOCALE_DATA, LocaleDataIndex} from './locale_data';
 import localeEn from './locale_en';
+import {global} from '../util/global';
 
 /**
  * Register locale data to be used internally by Angular. See the
@@ -75,9 +76,14 @@ export function getLocalePluralCase(locale: string): (value: number) => number {
 
 
 /**
- * Helper function to get the given `normalizedLocale` from `LOCALE_DATA`.
+ * Helper function to get the given `normalizedLocale` from `LOCALE_DATA`
+ * or from the global `ng.common.locale`.
  */
 export function getLocaleData(normalizedLocale: string): any {
+  if (!(normalizedLocale in LOCALE_DATA)) {
+    LOCALE_DATA[normalizedLocale] = global.ng && global.ng.common && global.ng.common.locale &&
+        global.ng.common.locale[normalizedLocale];
+  }
   return LOCALE_DATA[normalizedLocale];
 }
 

packages/core/test/i18n/locale_data_api_spec.ts

@@ -6,15 +6,19 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {findLocaleData, registerLocaleData, unregisterLocaleData} from '../../src/i18n/locale_data_api';
+import {global} from '../../src/util/global';
 
 {
   describe('locale data api', () => {
     const localeCaESVALENCIA: any[] = ['ca-ES-VALENCIA'];
+    const localeDe: any[] = ['de'];
+    const localeDeCH: any[] = ['de-CH'];
     const localeEn: any[] = ['en'];
     const localeFr: any[] = ['fr'];
     const localeFrCA: any[] = ['fr-CA'];
     const localeZh: any[] = ['zh'];
     const localeEnAU: any[] = ['en-AU'];
+    const fakeGlobalFr: any[] = ['fr'];
 
     beforeAll(() => {
       registerLocaleData(localeCaESVALENCIA);
@@ -25,9 +29,18 @@ import {findLocaleData, registerLocaleData, unregisterLocaleData} from '../../sr
       registerLocaleData(localeFrCA, 'fake_Id2');
       registerLocaleData(localeZh);
       registerLocaleData(localeEnAU);
+      global.ng = global.ng || {};
+      global.ng.common = global.ng.common || {locale: {}};
+      global.ng.common.locale = global.ng.common.locale || {};
+      global.ng.common.locale['fr'] = fakeGlobalFr;
+      global.ng.common.locale['de'] = localeDe;
+      global.ng.common.locale['de-ch'] = localeDeCH;
     });
 
-    afterAll(() => unregisterLocaleData());
+    afterAll(() => {
+      unregisterLocaleData();
+      delete global.ng.common.locale;
+    });
 
     describe('findLocaleData', () => {
       it('should throw if the LOCALE_DATA for the chosen locale or its parent locale is not available',
@@ -55,6 +68,15 @@ import {findLocaleData, registerLocaleData, unregisterLocaleData} from '../../sr
         expect(findLocaleData('fake_iD')).toEqual(localeFr);
         expect(findLocaleData('fake-id2')).toEqual(localeFrCA);
       });
+
+      it('should find the exact LOCALE_DATA if the locale is on the global object',
+         () => { expect(findLocaleData('de-CH')).toEqual(localeDeCH); });
+
+      it('should find the parent LOCALE_DATA if the exact locale is not available and the parent locale is on the global object',
+         () => { expect(findLocaleData('de-BE')).toEqual(localeDe); });
+
+      it('should find the registered LOCALE_DATA even if the same locale is on the global object',
+         () => { expect(findLocaleData('fr')).not.toBe(fakeGlobalFr); });
     });
   });
 }