Parsed named expressions 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 46 matching lines @@
   createJumpTarget(JumpTargetKind kind, int charOffset) {
     // TODO(ahe): Implement jump targets.
     return null;
   }
 
   void beginLiteralString(Token token) {
     debugEvent("beginLiteralString");
     push(token);
   }
 
+  void handleNamedArgument(Token colon) {
+    debugEvent("NamedArgument");
+    Expression expression = pop();
+    SimpleIdentifier name = pop();
+    push(ast.namedExpression(
+        ast.label(name, toAnalyzerToken(colon)), expression));
+  }
+
   @override
   void handleNoConstructorReferenceContinuationAfterTypeArguments(Token token) {
     debugEvent("NoConstructorReferenceContinuationAfterTypeArguments");
     push(NullValue.ConstructorReferenceContinuationAfterTypeArguments);
   }
 
   @override
   void endConstructorReference(
       Token start, Token periodBeforeName, Token endToken) {
     debugEvent("ConstructorReference");
@@ skipping 1716 matching lines @@
       } else if (identical('static', s)) {
         staticKeyword = token;
       } else if (identical('var', s)) {
         finalConstOrVarKeyword = token;
       } else {
         internalError('Unhandled modifier: $s');
       }
     }
   }
 }