Support factory methods.

frog/leg/lib/core.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.
 
 void print(var obj) {
   // TODO(ngeoffray): enable when the parser accepts it.
   // obj = obj.toString();
   var hasConsole = JS(@"typeof console == 'object'");
   if (hasConsole) {
     JS(@"console.log($0)", obj);
@@ skipping 227 matching lines @@
     return JS(@"$0.length", receiver);
   }
   throw "Unimplemented user-defined length.";
 }
 
 class int {}
 class double {}
 class String {}
 class bool {}
 class Object {}
-class List<T> {}
+class List<T> {
+  factory List(int n) {
+    return JS(@"new Array($0)", n);

[kasperl, 2011/12/22 11:34:42]

Should we be checking that i is an int here (at least a number)?

[ngeoffray, 2011/12/22 13:07:02]

Done.

+  }
+}
 
 class Stopwatch {
   double startMs;
   double elapsedMs;
 
   Stopwatch() {
     elapsedMs = 0.0;
   }
 
   void start() {
@@ skipping 27 matching lines @@
       return JS(@"Math.floor($0)", elapsedMs);
     } else {
       return JS(@"Math.floor($0 + (Date.now() - $1))", elapsedMs, startMs);
     }
   }
 
   int frequency() {
     return 1000;
   }
 }