Generate code for some switch statements.

dart/frog/leg/tree/nodes.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.
 
 interface Visitor<R> {
   R visitBlock(Block node);
   R visitBreakStatement(BreakStatement node);
   R visitCatchBlock(CatchBlock node);
   R visitClassNode(ClassNode node);
   R visitConditional(Conditional node);
@@ skipping 1407 matching lines @@
     if (label !== null) label.accept(visitor);
     expression.accept(visitor);
     statements.accept(visitor);
   }
 
   Token getBeginToken() {
     if (label !== null) return label.getBeginToken();
     return caseKeyword;
   }
 
-  Token getEndToken() => statements.getEndToken();
+  Token getEndToken() {
+    if (statements.nodes.isEmpty()) {
+      // The colon after the expression.
+      return expression.getEndToken().next;
+    } else {
+      return statements.getEndToken();
+    }
+  }
 }
 
 class DefaultCase extends Node {
   final Identifier label;
   final NodeList statements;
 
   final Token defaultKeyword;
 
   DefaultCase(this.label, this.statements, this.defaultKeyword);
 
   DefaultCase asDefaultCase() => this;
 
   accept(Visitor visitor) => visitor.visitDefaultCase(this);
 
   visitChildren(Visitor visitor) {
     if (label !== null) label.accept(visitor);
     statements.accept(visitor);
   }
 
   Token getBeginToken() {
-    if (label === null) return label.getBeginToken();
+    if (label !== null) return label.getBeginToken();
     return defaultKeyword;
   }
 
-  Token getEndToken() => statements.getEndToken();
+  Token getEndToken() {
+    if (statements.nodes.isEmpty()) {
+      // The colon after default.
+      return defaultKeyword.next;
+    } else {
+      return statements.getEndToken();
+    }
+  }
 }
 
 class GotoStatement extends Statement {
   final Identifier target;
   final Token keywordToken;
   final Token semicolonToken;
 
   GotoStatement(this.target, this.keywordToken, this.semicolonToken);
 
   visitChildren(Visitor visitor) {
@@ skipping 206 matching lines @@
   static bool isConstructorRedirect(Send node) {
     return (node.receiver === null &&
             node.selector.asIdentifier() !== null &&
             node.selector.asIdentifier().isThis()) ||
            (node.receiver !== null &&
             node.receiver.asIdentifier() !== null &&
             node.receiver.asIdentifier().isThis() &&
             node.selector.asIdentifier() !== null);
   }
 }