Switch-implementation.

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 1387 matching lines @@
     cases.accept(visitor);
   }
 
   Token getBeginToken() => switchKeyword;
 
   Token getEndToken() => cases.getEndToken();
 }
 
 class SwitchCase extends Node {
   final Identifier label;
-  final Expression expression;
+  final NodeList expressions;
+  final Token defaultKeyword;
   final NodeList statements;
 
-  final Token caseKeyword;
+  final Token startToken;
 
-  SwitchCase(this.label, this.expression, this.statements, this.caseKeyword);
+  SwitchCase(this.label, this.expressions, this.defaultKeyword,
+             this.statements, this.startToken);
 
   SwitchCase asSwitchCase() => this;
 
+  bool get isDefaultCase() => defaultKeyword !== null;
+
   accept(Visitor visitor) => visitor.visitSwitchCase(this);
 
   visitChildren(Visitor visitor) {
     if (label !== null) label.accept(visitor);
-    expression.accept(visitor);
+    expressions.accept(visitor);
     statements.accept(visitor);
   }
 
   Token getBeginToken() {
-    if (label !== null) return label.getBeginToken();
-    return caseKeyword;
+    return startToken;
   }
 
   Token getEndToken() {
     if (statements.nodes.isEmpty()) {
       // The colon after the expression.
-      return expression.getEndToken().next;
+      return expressions.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();
-    return defaultKeyword;
-  }
-
-  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);
 
@@ skipping 221 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);
   }
 }