Parse constructor field initializers with Fasta.

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: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 374 matching lines @@
         toAnalyzerToken(elseToken),
         elsePart));
   }
 
   void prepareInitializers() {
     debugEvent("prepareInitializers");
   }
 
   void handleNoInitializers() {
     debugEvent("NoInitializers");
+    push(NullValue.ConstructorInitializers);
   }
 
   void endInitializers(int count, Token beginToken, Token endToken) {
     debugEvent("Initializers");
-    popList(count);
+    push(popList(count));
   }
 
   void endVariableInitializer(Token assignmentOperator) {
     debugEvent("VariableInitializer");
     assert(assignmentOperator.stringValue == "=");
     Expression initializer = pop();
     Identifier identifier = pop();
     // TODO(ahe): Don't push initializers, instead install them.
     push(ast.variableDeclaration(
         identifier, toAnalyzerToken(assignmentOperator), initializer));
@@ skipping 990 matching lines @@
     List<TypeParameter> typeParameters = popList(count);
     push(ast.typeParameterList(toAnalyzerToken(beginToken), typeParameters,
         toAnalyzerToken(endToken)));
   }
 
   @override
   void endMethod(Token getOrSet, Token beginToken, Token endToken) {
     debugEvent("Method");
     FunctionBody body = pop();
     ConstructorName redirectedConstructor = null; // TODO(paulberry)
-    List<ConstructorInitializer> initializers = null; // TODO(paulberry)
+    List<Object> initializerObjects = pop() ?? const [];
     Token separator = null; // TODO(paulberry)
     FormalParameterList parameters = pop();
     TypeParameterList typeParameters = pop(); // TODO(paulberry)
     var name = pop();
     TypeAnnotation returnType = pop(); // TODO(paulberry)
     _Modifiers modifiers = pop();
     List<Annotation> metadata = pop();
     Comment comment = pop();
 
+    var initializers = <ConstructorInitializer>[];
+    for (Object initializerObject in initializerObjects) {
+      if (initializerObject is AssignmentExpression) {
+        analyzer.Token thisKeyword;
+        analyzer.Token period;
+        SimpleIdentifier fieldName;
+        Expression left = initializerObject.leftHandSide;
+        if (left is PropertyAccess) {
+          var thisExpression = left.target as ThisExpression;
+          thisKeyword = thisExpression.thisKeyword;
+          period = left.operator;
+          fieldName = left.propertyName;
+        } else {
+          fieldName = left as SimpleIdentifier;
+        }
+        initializers.add(ast.constructorFieldInitializer(
+            thisKeyword,
+            period,
+            fieldName,
+            initializerObject.operator,
+            initializerObject.rightHandSide));
+      }
+    }
+
     void constructor(SimpleIdentifier returnType, analyzer.Token period,
         SimpleIdentifier name) {
       push(ast.constructorDeclaration(
           comment,
           metadata,
           toAnalyzerToken(modifiers?.externalKeyword),
           toAnalyzerToken(modifiers?.finalConstOrVarKeyword),
           null, // TODO(paulberry): factoryKeyword
           ast.simpleIdentifier(returnType.token),
           period,
@@ skipping 295 matching lines @@
       } else if (identical('static', s)) {
         staticKeyword = token;
       } else if (identical('var', s)) {
         finalConstOrVarKeyword = token;
       } else {
         internalError('Unhandled modifier: $s');
       }
     }
   }
 }