More efficient Int64 parsing and printing.

pkg/fixnum/lib/src/int32.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.
 
 part of fixnum;
 
 /**
  * An immutable 32-bit signed integer, in the range [-2^31, 2^31 - 1].
  * Arithmetic operations may overflow in order to maintain this range.
  */
@@ skipping 27 matching lines @@
   static const Int32 TWO = const Int32._internal(2);
 
   // Hex digit char codes
   static const int _CC_0 = 48; // '0'.codeUnitAt(0)
   static const int _CC_9 = 57; // '9'.codeUnitAt(0)
   static const int _CC_a = 97; // 'a'.codeUnitAt(0)
   static const int _CC_z = 122; // 'z'.codeUnitAt(0)
   static const int _CC_A = 65; // 'A'.codeUnitAt(0)
   static const int _CC_Z = 90; // 'Z'.codeUnitAt(0)
 
-  static int _decodeHex(int c) {
+  static int _decodeDigit(int c) {
     if (c >= _CC_0 && c <= _CC_9) {
       return c - _CC_0;
     } else if (c >= _CC_a && c <= _CC_z) {
       return c - _CC_a + 10;
     } else if (c >= _CC_A && c <= _CC_Z) {
       return c - _CC_A + 10;
     } else {
       return -1; // bad char code
     }
   }
 
   /**
    * Parses a [String] in a given [radix] between 2 and 16 and returns an
    * [Int32].
    */
   // TODO(rice) - Make this faster by converting several digits at once.
   static Int32 parseRadix(String s, int radix) {
     if ((radix <= 1) || (radix > 16)) {
       throw new ArgumentError("Bad radix: $radix");
     }
     Int32 x = ZERO;
     for (int i = 0; i < s.length; i++) {
       int c = s.codeUnitAt(i);
-      int digit = _decodeHex(c);
+      int digit = _decodeDigit(c);
       if (digit < 0 || digit >= radix) {
         throw new Exception("Non-radix code unit: $c");
       }
       x = (x * radix) + digit;
     }
     return x;
   }
 
   /**
    * Parses a decimal [String] and returns an [Int32].
@@ skipping 260 matching lines @@
   }
 
   int toInt() => _i;
   Int32 toInt32() => this;
   Int64 toInt64() => new Int64.fromInt(_i);
 
   String toString() => _i.toString();
   String toHexString() => _i.toRadixString(16);
   String toRadixString(int radix) => _i.toRadixString(radix);
 }