Implement FunctionTypeAlias in AstBuilder.

pkg/front_end/lib/src/fasta/analyzer/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:front_end/src/fasta/scanner/token.dart'
     show BeginGroupToken, Token;
 
 import 'package:analyzer/analyzer.dart';
@@ skipping 1058 matching lines @@
 
   @override
   void handleVoidKeyword(Token token) {
     debugEvent("VoidKeyword");
     // TODO(paulberry): is this sufficient, or do we need to hook the "void"
     // keyword up to an element?
     handleIdentifier(token);
     handleNoTypeArguments(token);
     endType(token, token);
   }
+
+  @override
+  void endFunctionTypeAlias(Token typedefKeyword, Token endToken) {
+    debugEvent("FunctionTypeAlias");
+    FormalParameterList parameters = pop();
+    TypeParameterList typeParameters = pop();
+    SimpleIdentifier name = pop();
+    TypeAnnotation returnType = pop();
+    List<Annotation> metadata = pop();
+    // TODO(paulberry): capture doc comments.
+    Comment comment = null;
+    push(ast.functionTypeAlias(
+        comment,
+        metadata,
+        toAnalyzerToken(typedefKeyword),
+        returnType,
+        name,
+        typeParameters,
+        parameters,
+        toAnalyzerToken(endToken)));
+  }
 }
 
 /// Data structure placed on the stack to represent a class body.
 ///
 /// This is needed because analyzer has no separate AST representation of a
 /// class body; it simply stores all of the relevant data in the
 /// [ClassDeclaration] object.
 class _ClassBody {
   final Token beginToken;
 
@@ skipping 12 matching lines @@
 /// [ClassDeclaration] or [ClassTypeAlias] object.
 class _MixinApplication {
   final TypeName supertype;
 
   final Token withKeyword;
 
   final List<TypeName> mixinTypes;
 
   _MixinApplication(this.supertype, this.withKeyword, this.mixinTypes);
 }