Allow binary operators on compile-time-constants.

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 685 matching lines @@
       new RawSourceDartString(source, length);
   factory DartString.escapedString(SourceString source, int length) =>
       new EscapedSourceDartString(source, length);
   DartString();
   abstract int get length();
   bool isEmpty() => length == 0;
   // TODO(lrn): Is this test too expensive?
   bool definitelyEquals(DartString other) => toString() == other.toString();
   abstract Iterator<int> iterator();
   abstract String toString();
+
+  bool operator ==(var other) {
+    if (other is !DartString) return false;
+    DartString otherString = other;
+    if (length != otherString.length) return false;
+    Iterator it1 = iterator();
+    Iterator it2 = otherString.iterator();
+    while (it1.hasNext()) {
+      assert(it2.hasNext());

[ngeoffray, 2012/02/21 11:22:09]

I find this assert and the one line 717 too much.

[floitsch, 2012/02/22 10:17:51]

Done.

+      if (it1.next() != it2.next()) return false;
+    }
+    assert(!it2.hasNext());
+    return true;
+  }
 }
 
 class LiteralDartString extends DartString {
   final String string;
   LiteralDartString(this.string);
   int get length() => string.length;
   Iterator<int> iterator() => new StringCodeIterator(string);
   String toString() => string;
 }
 
@@ skipping 759 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);
   }
 }