First stab at parsing redirecting constructors.

lib/compiler/implementation/scanner/listener.dart

Index: lib/compiler/implementation/scanner/listener.dart
diff --git a/lib/compiler/implementation/scanner/listener.dart b/lib/compiler/implementation/scanner/listener.dart
index 2017961c5a8ed5f4ebd4e522d21fd37284dceb12..b1c217a4b948d269ea553d49862e56fc11f2161a 100644
--- a/lib/compiler/implementation/scanner/listener.dart
+++ b/lib/compiler/implementation/scanner/listener.dart
@@ -268,6 +268,18 @@ class Listener {
   void endPartOf(Token partKeyword, Token semicolon) {
   }
 
+  void beginQualifiedList(Token start) {
+  }
+
+  void endQualifiedList(int count) {
+  }
+
+  void beginRedirectingFactoryBody(Token token) {
+  }
+
+  void endRedirectingFactoryBody(Token beginToken, Token endToken) {
+  }
+
   void beginReturnStatement(Token token) {
   }
 
@@ -1207,6 +1219,16 @@ class NodeListener extends ElementListener {
     pushNode(null);
   }
 
+  void endQualifiedList(int count) {
+    pushNode(makeNodeList(count, null, null, "."));
+  }
+
+  void endRedirectingFactoryBody(Token beginToken,
+                                 Token endToken) {
+    NodeList qualifiedList = popNode();
+    pushNode(new Return(beginToken, endToken, qualifiedList));
+  }
+
   void endReturnStatement(bool hasExpression,
                           Token beginToken, Token endToken) {
     Expression expression = hasExpression ? popNode() : null;
@@ -1634,13 +1656,16 @@ class NodeListener extends ElementListener {
       // A library prefix was handled in [handleQualified].
       name = new Send(popNode(), name);
     }
-    handleModifier(startKeyword);
-    if (startKeyword.stringValue === 'external') {
-      handleModifier(startKeyword.next);
-      handleModifiers(2);
-    } else {
-      handleModifiers(1);
+    int modifierCount = 0;
+    Token modifier = startKeyword;
+    for (;;) {

[ahe, 2012/10/09 10:51:37]

Could you unfold this loop so we can easily see that it terminates.

[Lasse Reichstein Nielsen, 2012/10/09 11:51:26]

Done.

+      // Handle 'external' and 'const' occuring before 'factory'.
+      handleModifier(modifier);
+      modifierCount++;
+      if (modifier.stringValue === 'factory') break;
+      modifier = modifier.next;
     }
+    handleModifiers(modifierCount);
     Modifiers modifiers = popNode();
     pushNode(new FunctionExpression(name, formals, body, null,
                                     modifiers, null, null));