Fix for 1267: Implement (partially) Math.pow for integers.

runtime/lib/integers.dart

 // Copyright (c) 2012, 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.
 
 // TODO(srdjan): fix limitations.
 // - shift amount must be a Smi.
 class IntegerImplementation {
   factory IntegerImplementation._uninstantiable() {
     throw const UnsupportedOperationException(
         "IntegerImplementation can only be allocated by the VM");
@@ skipping 100 matching lines @@
 
   int round() { return this; }
   int floor() { return this; }
   int ceil() { return this; }
   int truncate() { return this; }
 
   int toInt() { return this; }
   double toDouble() { return new Double.fromInteger(this); }
 
   int pow(int exponent) {
-    throw "IntegerImplementation.pow not implemented";
+    double res = this.toDouble().pow(exponent);

[siva, 2012/02/22 01:10:43]

our Bigint to double conversion is not implemented correctly and I am not sure
this would work for that case. Maybe instead you could throw an unimplemented
exception if 'this' is a bigint.

[srdjan, 2012/02/22 01:38:59]

Done.

+    if (res.isInfinite()) {
+      // Use Bigint instead.
+      throw "IntegerImplementation.pow not implemented for large integers.";
+    }
+    return res.toInt();
   }
 
   String toStringAsFixed(int fractionDigits) {
     // Issue 460.
     throw "IntegerImplementation.toStringAsFixed not implemented";
   }
   String toStringAsExponential(int fractionDigits) {
     // Issue 460.
     throw "IntegerImplementation.toStringAsExponential not implemented";
   }
@@ skipping 81 matching lines @@
     if (other < 0) {
       return -1;
     } else {
       return 0;
     }
   }
   int shlFromInt(int other) {
     throw const OutOfMemoryException();
   }
 }