Fraction class prototype and test (not to be committed).

runtime/lib/bigint.dart

 // Copyright (c) 2014, 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.
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 /*
  * Copyright (c) 2003-2005  Tom Wu
@@ skipping 1241 matching lines @@
     }
     return other._toBigint()._lShift(shift)._toValidInt();
   }
 
   // Overriden operators and methods.
 
   // The following operators override operators of _IntegerImplementation for
   // efficiency, but are not necessary for correctness. They shortcut native
   // calls that would return null because the receiver is _Bigint.
   num operator +(num other) {
-    return other._toBigintOrDouble()._addFromInteger(this);
+    return other._toBigintIfInteger()._addFromInteger(this);
   }
   num operator -(num other) {
-    return other._toBigintOrDouble()._subFromInteger(this);
+    return other._toBigintIfInteger()._subFromInteger(this);
   }
   num operator *(num other) {
-    return other._toBigintOrDouble()._mulFromInteger(this);
+    return other._toBigintIfInteger()._mulFromInteger(this);
   }
   num operator ~/(num other) {
-    return other._toBigintOrDouble()._truncDivFromInteger(this);
+    return other._toBigintIfInteger()._truncDivFromInteger(this);
   }
   num operator %(num other) {
-    return other._toBigintOrDouble()._moduloFromInteger(this);
+    return other._toBigintIfInteger()._moduloFromInteger(this);
   }
   int operator &(int other) {
-    return other._toBigintOrDouble()._bitAndFromInteger(this);
+    return other._toBigintIfInteger()._bitAndFromInteger(this);
   }
   int operator |(int other) {
-    return other._toBigintOrDouble()._bitOrFromInteger(this);
+    return other._toBigintIfInteger()._bitOrFromInteger(this);
   }
   int operator ^(int other) {
-    return other._toBigintOrDouble()._bitXorFromInteger(this);
+    return other._toBigintIfInteger()._bitXorFromInteger(this);
   }
   int operator >>(int other) {
-    return other._toBigintOrDouble()._shrFromInt(this);
+    return other._toBigintIfInteger()._shrFromInt(this);
   }
   int operator <<(int other) {
-    return other._toBigintOrDouble()._shlFromInt(this);
+    return other._toBigintIfInteger()._shlFromInt(this);
   }
   // End of operator shortcuts.
 
   int operator -() {
     return _negate()._toValidInt();
   }
 
   int get sign {
     return (_used == 0) ? 0 : _neg ? -1 : 1;
   }
@@ skipping 782 matching lines @@
 
   int _mul(Uint32List x_digits, int x_used,
            Uint32List y_digits, int y_used,
            Uint32List r_digits) {
     var r_used = _Bigint._mulDigits(x_digits, x_used,
                                     y_digits, y_used,
                                     r_digits);
     return _reduce(r_digits, r_used);
   }
 }