Parse YieldStatement with Fasta.

pkg/analyzer/lib/src/fasta/ast_builder.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.analyzer.ast_builder;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast_factory.dart' show AstFactory;
 import 'package:analyzer/dart/ast/standard_ast_factory.dart' as standard;
 import 'package:analyzer/dart/ast/token.dart' as analyzer show Token;
@@ skipping 421 matching lines @@
     exitBreakTarget();
     push(ast.whileStatement(
         toAnalyzerToken(whileKeyword),
         condition.leftParenthesis,
         condition.expression,
         condition.rightParenthesis,
         body));
   }
 
   @override
+  void endYieldStatement(Token yieldToken, Token starToken, Token endToken) {
+    debugEvent("YieldStatement");
+    assert(endToken.lexeme == ';');
+    Expression expression = pop();
+    push(ast.yieldStatement(toAnalyzerToken(yieldToken),
+        toAnalyzerToken(starToken), expression, toAnalyzerToken(endToken)));
+  }
+
+  @override
   void handleNoVariableInitializer(Token token) {
     debugEvent("NoVariableInitializer");
   }
 
   void endInitializedIdentifier(Token nameToken) {
     debugEvent("InitializedIdentifier");
     AstNode node = pop();
     VariableDeclaration variable;
     // TODO(paulberry): This seems kludgy.  It would be preferable if we
     // could respond to a "handleNoVariableInitializer" event by converting a
@@ skipping 1390 matching lines @@
       } else if (identical('static', s)) {
         staticKeyword = token;
       } else if (identical('var', s)) {
         finalConstOrVarKeyword = token;
       } else {
         internalError('Unhandled modifier: $s');
       }
     }
   }
 }