parseInt fixes.

frog/lib/math.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.
 
 // Dart core library.
 
 class Math native 'Math' {
   /**
    * Base of the natural logarithms.
    */
@@ skipping 33 matching lines @@
    * Square root of 2.
    */
   static final double SQRT2 = 1.4142135623730951;
 
   /**
    * Parses a [String] representation of an [int], and returns
    * an [int]. Throws a [BadNumberFormatException] if [str]
    * cannot be parsed as an [int].
    */
   static int parseInt(String str) native '''
-  var isHex = (str.length > 2) && str[0] == '0' &&
-              (str[1] == 'x' || str[1] == 'X');
+  var match = /^\\s*[+-]?(?:(0[xX][abcdefABCDEF0-9]+)|\\d+)\\s*\$/.exec(str);
+  if (!match) \$throw(new BadNumberFormatException(str));
+  var isHex = !!match[1];
   var ret = parseInt(str, isHex ? 16 : 10);
   if (isNaN(ret)) \$throw(new BadNumberFormatException(str));
   return ret;''' { throw new BadNumberFormatException(""); }
 
   /**
    * Parses a [String] representation of a [double], and returns
    * a [double]. Throws a [BadNumberFormatException] if [str] cannot
    * be parsed as a [double].
    */
   static double parseDouble(String str) native '''var ret = parseFloat(str);
@@ skipping 30 matching lines @@
   static double sin(num x) native;
   static double cos(num x) native;
   static double tan(num x) native;
   static double acos(num x) native;
   static double asin(num x) native;
   static double atan(num x) native;
   static double sqrt(num x) native;
   static double exp(num x) native;
   static double log(num x) native;
 }