feat(i18n): add custom placeholder names

Closes #7799

Closes #8057

modules/angular2/test/compiler/expression_parser/parser_spec.ts

@@ -103,6 +103,11 @@ export function main() {
 
       it('should parse grouped expressions', () => { checkAction("(1 + 2) * 3", "1 + 2 * 3"); });
 
+      it('should ignore comments in expressions', () => { checkAction('a //comment', 'a'); });
+
+      it('should retain // in string literals',
+         () => { checkAction(`"http://www.google.com"`, `"http://www.google.com"`); });
+
       it('should parse an empty string', () => { checkAction(''); });
 
       describe("literals", () => {
@@ -269,6 +274,14 @@ export function main() {
       });
 
       it('should parse conditional expression', () => { checkBinding('a < b ? a : b'); });
+
+      it('should ignore comments in bindings', () => { checkBinding('a //comment', 'a'); });
+
+      it('should retain // in string literals',
+         () => { checkBinding(`"http://www.google.com"`, `"http://www.google.com"`); });
+
+      it('should retain // in : microsyntax', () => { checkBinding('one:a//b', 'one:a//b'); });
+
     });
 
     describe('parseTemplateBindings', () => {
@@ -424,6 +437,31 @@ export function main() {
       it('should parse expression with newline characters', () => {
         checkInterpolation(`{{ 'foo' +\n 'bar' +\r 'baz' }}`, `{{ "foo" + "bar" + "baz" }}`);
       });
+
+      describe("comments", () => {
+        it('should ignore comments in interpolation expressions',
+           () => { checkInterpolation('{{a //comment}}', '{{ a }}'); });
+
+        it('should retain // in single quote strings', () => {
+          checkInterpolation(`{{ 'http://www.google.com' }}`, `{{ "http://www.google.com" }}`);
+        });
+
+        it('should retain // in double quote strings', () => {
+          checkInterpolation(`{{ "http://www.google.com" }}`, `{{ "http://www.google.com" }}`);
+        });
+
+        it('should ignore comments after string literals',
+           () => { checkInterpolation(`{{ "a//b" //comment }}`, `{{ "a//b" }}`); });
+
+        it('should retain // in complex strings', () => {
+          checkInterpolation(`{{"//a\'//b\`//c\`//d\'//e" //comment}}`, `{{ "//a\'//b\`//c\`//d\'//e" }}`);
+        });
+
+        it('should retain // in nested, unterminated strings', () => {
+          checkInterpolation(`{{ "a\'b\`" //comment}}`, `{{ "a\'b\`" }}`);
+        });
+      });
+
     });
 
     describe("parseSimpleBinding", () => {