Start supporting default classes.

dart/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 13 matching lines @@
     MemberListener listener = new MemberListener(diagnosticListener, this);
     Parser parser = new ClassElementParser(listener);
     Token token = parser.parseTopLevelDeclaration(beginToken);
     assert(token === endToken.next);
     cachedNode = listener.popNode();
     assert(listener.nodes.isEmpty());
     return cachedNode;
   }
 
   Token position() => beginToken;
+
+  bool isInterface() => beginToken.stringValue === "interface";
 }
 
 class MemberListener extends NodeListener {
   final ClassElement enclosingElement;
 
   MemberListener(DiagnosticListener listener,
                  [Element this.enclosingElement = null])
     : super(listener);
 
   bool isConstructorName(Node nameNode) {
     if (enclosingElement === null ||
         enclosingElement.kind != ElementKind.CLASS) {
       return false;
     }
     SourceString name;
     if (nameNode.asIdentifier() !== null) {
       name = nameNode.asIdentifier().source;
     } else {
       Send send = nameNode.asSend();
       name = send.receiver.asIdentifier().source;
     }
     return enclosingElement.name == name;
   }
 
+  SourceString getMethodNameHack(Node methodName) {
+    Send send = methodName.asSend();
+    if (send === null) return methodName.asIdentifier().source;
+    Identifier receiver = send.receiver.asIdentifier();
+    Identifier selector = send.selector.asIdentifier();
+    if (selector.asOperator() !== null) {
+      return Elements.constructOperatorName(receiver.source, selector.source);
+    } else {
+      return Elements.constructConstructorName(receiver.source,
+                                               selector.source);
+    }
+  }
+
   void endMethod(Token getOrSet, Token beginToken, Token endToken) {
     super.endMethod(getOrSet, beginToken, endToken);
     FunctionExpression method = popNode();
     pushNode(null);
     bool isConstructor = isConstructorName(method.name);
-    SourceString name;
-    Node methodName = method.name;
-    if (methodName.asSend() !== null) {
-      Send send = methodName.asSend();
-      Identifier receiver = send.receiver.asIdentifier();
-      Identifier selector = send.selector.asIdentifier();
-      if (selector.asOperator() !== null) {
-        name = Elements.constructOperatorName(
-            receiver.source, selector.source);
-      } else {
-        name = Elements.constructConstructorName(
-            receiver.source, selector.source);
-      }
-    } else {
-      name = methodName.asIdentifier().source;
-    }
+    SourceString name = getMethodNameHack(method.name);
     ElementKind kind = ElementKind.FUNCTION;
     if (isConstructor) {
       if (getOrSet !== null) {
         recoverableError('illegal modifier', token: getOrSet);
       }
       kind = ElementKind.GENERATIVE_CONSTRUCTOR;
     } else if (getOrSet !== null) {
       kind = (getOrSet.stringValue === 'get')
              ? ElementKind.GETTER : ElementKind.SETTER;
     }
     Element memberElement =
         new PartialFunctionElement(name, beginToken, getOrSet, endToken,
                                    kind, method.modifiers, enclosingElement);
     enclosingElement.addMember(memberElement, listener);
   }
 
   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) {
-      listener.cancel('Qualified factory names not implemented', node: method);
-    }
-    Identifier name = method.name;
+    SourceString name = getMethodNameHack(method.name);
     ElementKind kind = ElementKind.FUNCTION;
     Element memberElement =
-        new PartialFunctionElement(name.source, factoryKeyword, null, endToken,
+        new PartialFunctionElement(name, factoryKeyword, null, endToken,
                                    kind, method.modifiers, enclosingElement);
     enclosingElement.addMember(memberElement, listener);
   }
 
   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, listener);
     }
     buildFieldElements(modifiers, variableDefinitions.definitions,
                        enclosingElement,
                        buildFieldElement, beginToken, endToken);
   }
 
   void endInitializer(Token assignmentOperator) {
     pushNode(null); // Super expects an expression, but
                     // ClassElementParser just skips expressions.
     super.endInitializer(assignmentOperator);
   }
 
   void endInitializers(int count, Token beginToken, Token endToken) {
     pushNode(null);
   }
 }