Support factory methods.

frog/leg/scanner/class_element_parser.dart

 // Copyright (c) 2011, 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.
 
 class ClassElementParser extends PartialParser {
   ClassElementParser(Listener listener) : super(listener);
 
   Token parseClassBody(Token token) => fullParseClassBody(token);
 }
 
@@ skipping 30 matching lines @@
            enclosingElement.kind == ElementKind.CLASS &&
            enclosingElement.name == name.source;
   }
 
   void endMethod(Token beginToken, Token period, Token endToken) {
     super.endMethod(beginToken, period, endToken);
     FunctionExpression method = popNode();
     pushNode(null);
     Identifier name = method.name; // TODO(ahe): Named constructors.
     ElementKind kind = isConstructor(name) ?
-                       ElementKind.CONSTRUCTOR :
+                       ElementKind.GENERATIVE_CONSTRUCTOR :
                        ElementKind.FUNCTION;
     Element memberElement =
         new PartialFunctionElement(name.source, beginToken, endToken,
                                    kind, method.modifiers, enclosingElement);
     enclosingElement.addMember(memberElement);
   }
 
+  void endFactoryMethod(Token factoryKeyword, Token periodBeforeName,
+                        Token endToken) {
+    super.endFactoryMethod(factoryKeyword, periodBeforeName, endToken);
+    FunctionExpression method = popNode();
+    pushNode(null);
+    // TODO(ahe): Named constructors.
+    if (method.name.asIdentifier() == null) {
+      canceler.cancel('Qualified factory names not implemented', node: method);
+    }
+    Identifier name = method.name;
+    ElementKind kind = ElementKind.FUNCTION;
+    Element memberElement =
+        new PartialFunctionElement(name.source, factoryKeyword, endToken, kind,
+                                   method.modifiers, enclosingElement);
+    enclosingElement.addMember(memberElement);
+  }
+
   void endFields(int count, Token beginToken, Token endToken) {
     super.endFields(count, beginToken, endToken);
     VariableDefinitions variableDefinitions = popNode();
     Modifiers modifiers = variableDefinitions.modifiers;
     pushNode(null);
     void buildFieldElement(SourceString name, Element fields) {
       Element element = new VariableElement(name, fields, ElementKind.FIELD,
                                             enclosingElement);
       enclosingElement.addMember(element);
     }
     buildFieldElements(modifiers, variableDefinitions.definitions,
                        buildFieldElement, beginToken, endToken);
   }
 
   void endInitializer(Token assignmentOperator) {
     canceler.cancel("field initializers are not implemented",
                     token: assignmentOperator);
   }
 
   void endInitializers(int count, Token beginToken, Token endToken) {
     pushNode(null);
   }
 }