Support factory methods.

frog/leg/scanner/class_element_parser.dart

Index: frog/leg/scanner/class_element_parser.dart
===================================================================
--- frog/leg/scanner/class_element_parser.dart	(revision 2741)
+++ frog/leg/scanner/class_element_parser.dart	(working copy)
@@ -48,7 +48,7 @@
     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,
@@ -56,6 +56,20 @@
     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.
+    Identifier name = method.returnType.typeName;
+    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();