feat(i18n): implement a simple version of message extractor

Closes #7454

modules/angular2/test/i18n/message_extractor_spec.ts

@@ -0,0 +1,162 @@
+import {
+  AsyncTestCompleter,
+  beforeEach,
+  ddescribe,
+  describe,
+  expect,
+  iit,
+  inject,
+  it,
+  xdescribe,
+  xit
+} from 'angular2/testing_internal';
+
+import {HtmlParser} from 'angular2/src/compiler/html_parser';
+import {MessageExtractor, Message, removeDuplicates} from 'angular2/src/i18n/message_extractor';
+import {Parser} from 'angular2/src/core/change_detection/parser/parser';
+import {Lexer} from 'angular2/src/core/change_detection/parser/lexer';
+
+export function main() {
+  describe('MessageExtractor', () => {
+    let extractor: MessageExtractor;
+
+    beforeEach(() => {
+      let htmlParser = new HtmlParser();
+      var parser = new Parser(new Lexer());
+      extractor = new MessageExtractor(htmlParser, parser);
+    });
+
+    it('should extract from elements with the i18n attr', () => {
+      let res = extractor.extract("<div i18n='meaning|desc'>message</div>", "someurl");
+      expect(res.messages).toEqual([new Message("message", 'meaning', 'desc')]);
+    });
+
+    it('should extract from elements with the i18n attr without a desc', () => {
+      let res = extractor.extract("<div i18n='meaning'>message</div>", "someurl");
+      expect(res.messages).toEqual([new Message("message", 'meaning', null)]);
+    });
+
+    it('should extract from elements with the i18n attr without a meaning', () => {
+      let res = extractor.extract("<div i18n>message</div>", "someurl");
+      expect(res.messages).toEqual([new Message("message", null, null)]);
+    });
+
+    it('should extract from attributes', () => {
+      let res = extractor.extract(`
+        <div
+          title1='message1' i18n-title1='meaning1|desc1'
+          title2='message2' i18n-title2='meaning2|desc2'>
+        </div>
+      `,
+                                  "someurl");
+
+      expect(res.messages)
+          .toEqual([
+            new Message("message1", "meaning1", "desc1"),
+            new Message("message2", "meaning2", "desc2")
+          ]);
+    });
+
+    it('should error on i18n attributes without matching "real" attributes', () => {
+      let res = extractor.extract(`
+        <div
+          title1='message1' i18n-title1='meaning1|desc1' i18n-title2='meaning2|desc2'>
+        </div>
+      `,
+                                  "someurl");
+
+      expect(res.errors.length).toEqual(1);
+      expect(res.errors[0].msg).toEqual("Missing attribute 'title2'.");
+    });
+
+    it('should extract from partitions', () => {
+      let res = extractor.extract(`
+         <!-- i18n: meaning1|desc1 -->message1<!-- /i18n -->
+         <!-- i18n: meaning2|desc2 -->message2<!-- /i18n -->`,
+                                  "someUrl");
+
+      expect(res.messages)
+          .toEqual([
+            new Message("message1", "meaning1", "desc1"),
+            new Message("message2", "meaning2", "desc2")
+          ]);
+    });
+
+    it('should ignore other comments', () => {
+      let res = extractor.extract(`
+         <!-- i18n: meaning1|desc1 --><!-- other -->message1<!-- /i18n -->`,
+                                  "someUrl");
+
+      expect(res.messages).toEqual([new Message("message1", "meaning1", "desc1")]);
+    });
+
+    it('should error when cannot find a matching desc', () => {
+      let res = extractor.extract(`
+         <!-- i18n: meaning1|desc1 -->message1`,
+                                  "someUrl");
+
+      expect(res.errors.length).toEqual(1);
+      expect(res.errors[0].msg).toEqual("Missing closing 'i18n' comment.");
+    });
+
+    it('should replace interpolation with placeholders (text nodes)', () => {
+      let res = extractor.extract("<div i18n>Hi {{one}} and {{two}}</div>", "someurl");
+      expect(res.messages).toEqual([new Message("Hi {{I0}} and {{I1}}", null, null)]);
+    });
+
+    it('should replace interpolation with placeholders (attributes)', () => {
+      let res =
+          extractor.extract("<div title='Hi {{one}} and {{two}}' i18n-title></div>", "someurl");
+      expect(res.messages).toEqual([new Message("Hi {{I0}} and {{I1}}", null, null)]);
+    });
+
+    it('should ignore errors in interpolation', () => {
+      let res = extractor.extract("<div i18n>Hi {{on???.s}}</div>", "someurl");
+      expect(res.messages).toEqual([new Message("Hi {{on???.s}}", null, null)]);
+    });
+
+    it("should return parse errors when the template is invalid", () => {
+      let res = extractor.extract("<input&#Besfs", "someurl");
+      expect(res.errors.length).toEqual(1);
+      expect(res.errors[0].msg).toEqual('Unexpected character "s"');
+    });
+
+    it("should handle html content", () => {
+      let res = extractor.extract('<div i18n><div attr="value">message</div></div>', "someurl");
+      expect(res.messages).toEqual([new Message('<div attr="value">message</div>', null, null)]);
+    });
+
+    it("should extract from nested elements", () => {
+      let res = extractor.extract(
+          '<div title="message1" i18n-title="meaning1|desc1"><div i18n="meaning2|desc2">message2</div></div>',
+          "someurl");
+      expect(res.messages)
+          .toEqual([
+            new Message("message2", "meaning2", "desc2"),
+            new Message("message1", "meaning1", "desc1")
+          ]);
+    });
+
+    it("should extract messages from attributes in i18n blocks", () => {
+      let res = extractor.extract(
+          '<div i18n><div attr="value" i18n-attr="meaning|desc">message</div></div>', "someurl");
+      expect(res.messages)
+          .toEqual([
+            new Message('<div attr="value">message</div>', null, null),
+            new Message('value', "meaning", "desc")
+          ]);
+    });
+
+    it("should remove duplicate messages", () => {
+      let res = extractor.extract(`
+         <!-- i18n: meaning|desc1 -->message<!-- /i18n -->
+         <!-- i18n: meaning|desc2 -->message<!-- /i18n -->`,
+                                  "someUrl");
+
+      expect(removeDuplicates(res.messages))
+          .toEqual([
+            new Message("message", "meaning", "desc1"),
+          ]);
+    });
+  });
+}