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

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.
 
 abstract class _IntegerImplementation {
   // The Dart class _Bigint extending _IntegerImplementation requires a
   // default constructor.
 
   Type get runtimeType => int;
 
@@ skipping 74 matching lines @@
     if (result != null) return result;
     return other._toBigint()._shlFromInt(this);
   }
   bool operator <(num other) {
     return other > this;
   }
   bool operator >(num other) {
     return other._greaterThanFromInteger(this);
   }
   bool operator >=(num other) {
-    return (this == other) ||  (this > other);
+    return (this == other) || (this > other);
   }
   bool operator <=(num other) {
     return (this == other) || (this < other);
   }
   bool _greaterThanFromInteger(int other)
       native "Integer_greaterThanFromInteger";
+  bool _greaterThanFromFraction(fraction other) {
+    return other._numerator > (other._denominator * this);
+  }
   bool operator ==(other) {
     if (other is num) {
       return other._equalToInteger(this);
     }
     return false;
   }
   bool _equalToInteger(int other) native "Integer_equalToInteger";
+  bool _equalToFraction(fraction other) {
+    return (this * other._denominator) == other._numerator;
+  }
   int abs() {
     return this < 0 ? -this : this;
   }
   int get sign {
     return (this > 0) ? 1 : (this < 0) ? -1 : 0;
   }
   bool get isEven => ((this & 1) == 0);
   bool get isOdd => !isEven;
   bool get isNaN => false;
   bool get isNegative => this < 0;
@@ skipping 74 matching lines @@
     }
     if (lowerLimit.isNaN) return lowerLimit;
     // Note that we don't need to care for -0.0 for the lower limit.
     if (this < lowerLimit) return lowerLimit;
     if (this.compareTo(upperLimit) > 0) return upperLimit;
     return this;
   }
 
   int toInt() { return this; }
   double toDouble() { return new _Double.fromInteger(this); }
+  fraction toFraction() { return new _Fraction.fromInteger(this); }
+  fraction toPercent() { return new _Fraction._percent(this*100); }
   _Bigint _toBigint() { return new _Bigint._fromInt(this); }
-  num _toBigintOrDouble() { return _toBigint(); }
+  num _toBigintIfInteger() { return _toBigint(); }
+  num _toDoubleOrFraction() { return new _Fraction.fromInteger(this); }
 
   String toStringAsFixed(int fractionDigits) {
     return this.toDouble().toStringAsFixed(fractionDigits);
   }
   String toStringAsExponential([int fractionDigits]) {
     return this.toDouble().toStringAsExponential(fractionDigits);
   }
   String toStringAsPrecision(int precision) {
     return this.toDouble().toStringAsPrecision(precision);
   }
@@ skipping 403 matching lines @@
   // Shift by mint exceeds range that can be handled by the VM.
   int _shrFromInt(int other) {
     if (other < 0) {
       return -1;
     } else {
       return 0;
     }
   }
   int _shlFromInt(int other) native "Mint_shlFromInt";
 }