Complete AST nodes for switch statement.

dart/frog/leg/resolver.dart

 // Copyright (c) 2012, 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.
 
 interface TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
 }
 
 class TreeElementMapping implements TreeElements {
@@ skipping 1121 matching lines @@
 
   visitLiteralMapEntry(LiteralMapEntry node) {
     unimplemented(node, 'map entry');
   }
 
   visitNamedArgument(NamedArgument node) {
     visit(node.expression);
   }
 
   visitSwitchStatement(SwitchStatement node) {
-    warning(node, MessageKind.GENERIC, ['switch statement is not implemented']);
+    node.expression.accept(this);
+    StatementElement element = getOrCreateStatementElement(node);
+    statementScope.enterLoop(element);

[Lasse Reichstein Nielsen, 2012/03/05 19:54:04]

Will need modifying (switch isn't a continue target), but this'll be fine for
now.

[ahe, 2012/03/05 20:07:23]

Good point. I'll probably need your help figuring this out.

+    node.cases.accept(this);
+    statementScope.exitLoop();
+  }
+
+  visitSwitchCase(SwitchCase node) {
+    // TODO(ahe): What about the label?

[Lasse Reichstein Nielsen, 2012/03/05 19:54:04]

We will probably have to make two passed over the switch, one (in
visitSwitchStatement) to gather labels and set up the statement scope, and one
to resolve the labels of continues in the case statements.

[ahe, 2012/03/05 20:07:23]

I was thinking about something similar.

+    node.expression.accept(this);
+    node.statements.accept(this);
+  }
+
+  visitDefaultCase(DefaultCase node) {
+    // TODO(ahe): What about the label?
+    node.statements.accept(this);
   }
 
   visitTryStatement(TryStatement node) {
     visit(node.tryBlock);
     if (node.catchBlocks.isEmpty() && node.finallyBlock == null) {
       // TODO(ngeoffray): The precise location is
       // node.getEndtoken.next. Adjust when issue #1581 is fixed.
       error(node, MessageKind.NO_CATCH_NOR_FINALLY);
     }
     visit(node.catchBlocks);
@@ skipping 310 matching lines @@
 class TopScope extends Scope {
   LibraryElement get library() => element;
 
   TopScope(LibraryElement library) : super(null, library);
   Element lookup(SourceString name) => library.find(name);
 
   Element add(Element element) {
     throw "Cannot add an element in the top scope";
   }
 }