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runtime/lib/math_patch.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.
 
 import "dart:typed_data";
 
 // A VM patch of the dart:math library.
 
 // If [x] is an [int] and [exponent] is a non-negative [int], the result is
 // an [int], otherwise the result is a [double].
-@patch num pow(num x, num exponent) {
+@patch
+num pow(num x, num exponent) {
   if ((x is int) && (exponent is int) && (exponent >= 0)) {
     return _intPow(x, exponent);
   }
   return _doublePow(x.toDouble(), exponent.toDouble());
 }
 
 double _doublePow(double base, double exponent) {
   if (exponent == 0.0) {
-    return 1.0;  // ECMA-262 15.8.2.13
+    return 1.0; // ECMA-262 15.8.2.13
   }
   // Speed up simple cases.
   if (exponent == 1.0) return base;
   if (exponent == 2.0) return base * base;
   if (exponent == 3.0) return base * base * base;
 
   if (base == 1.0) return 1.0;
 
   if (base.isNaN || exponent.isNaN) {
     return double.NAN;
@@ skipping 18 matching lines @@
     }
     exponent >>= 1;
     // Skip unnecessary operation (can overflow to Mint or Bigint).
     if (exponent != 0) {
       base *= base;
     }
   }
   return result;
 }
 
-@patch double atan2(num a, num b) => _atan2(a.toDouble(), b.toDouble());
-@patch double sin(num x) => _sin(x.toDouble());
-@patch double cos(num x) => _cos(x.toDouble());
-@patch double tan(num x) => _tan(x.toDouble());
-@patch double acos(num x) => _acos(x.toDouble());
-@patch double asin(num x) => _asin(x.toDouble());
-@patch double atan(num x) => _atan(x.toDouble());
-@patch double sqrt(num x) => _sqrt(x.toDouble());
-@patch double exp(num x) => _exp(x.toDouble());
-@patch double log(num x) => _log(x.toDouble());
+@patch
+double atan2(num a, num b) => _atan2(a.toDouble(), b.toDouble());
+@patch
+double sin(num x) => _sin(x.toDouble());
+@patch
+double cos(num x) => _cos(x.toDouble());
+@patch
+double tan(num x) => _tan(x.toDouble());
+@patch
+double acos(num x) => _acos(x.toDouble());
+@patch
+double asin(num x) => _asin(x.toDouble());
+@patch
+double atan(num x) => _atan(x.toDouble());
+@patch
+double sqrt(num x) => _sqrt(x.toDouble());
+@patch
+double exp(num x) => _exp(x.toDouble());
+@patch
+double log(num x) => _log(x.toDouble());
 
 double _atan2(double a, double b) native "Math_atan2";
 double _sin(double x) native "Math_sin";
 double _cos(double x) native "Math_cos";
 double _tan(double x) native "Math_tan";
 double _acos(double x) native "Math_acos";
 double _asin(double x) native "Math_asin";
 double _atan(double x) native "Math_atan";
 double _sqrt(double x) native "Math_sqrt";
 double _exp(double x) native "Math_exp";
 double _log(double x) native "Math_log";
 
-
 // TODO(iposva): Handle patch methods within a patch class correctly.
-@patch class Random {
-
-  @patch factory Random([int seed]) {
+@patch
+class Random {
+  @patch
+  factory Random([int seed]) {
     var state = _Random._setupSeed((seed == null) ? _Random._nextSeed() : seed);
     // Crank a couple of times to distribute the seed bits a bit further.
-    return new _Random._withState(state).._nextState()
-                                        .._nextState()
-                                        .._nextState()
-                                        .._nextState();
+    return new _Random._withState(state)
+      .._nextState()
+      .._nextState()
+      .._nextState()
+      .._nextState();
   }
 
-  @patch factory Random.secure() {
+  @patch
+  factory Random.secure() {
     return new _SecureRandom();
   }
 }
 
-
 class _Random implements Random {
   // Internal state of the random number generator.
   final Uint32List _state;
   static const _kSTATE_LO = 0;
-  static const _kSTATE_HI = 1;  // Unused in Dart code.
+  static const _kSTATE_HI = 1; // Unused in Dart code.
 
   _Random._withState(this._state);
 
   // The algorithm used here is Multiply with Carry (MWC) with a Base b = 2^32.
   // http://en.wikipedia.org/wiki/Multiply-with-carry
   // The constant A is selected from "Numerical Recipes 3rd Edition" p.348 B1.
 
   // Implements:
   //   var state =
   //       ((_A * (_state[_kSTATE_LO])) + _state[_kSTATE_HI]) & ((1 << 64) - 1);
   //   _state[_kSTATE_LO] = state & ((1 << 32) - 1);
   //   _state[_kSTATE_HI] = state >> 32;
   // This is a native to prevent 64-bit operations in Dart, which
   // fail with --throw_on_javascript_int_overflow.
   // TODO(regis): Implement in Dart and remove Random_nextState in math.cc.
   void _nextState() native "Random_nextState";
 
   int nextInt(int max) {
     const limit = 0x3FFFFFFF;
     if ((max <= 0) || ((max > limit) && (max > _POW2_32))) {
-      throw new RangeError.range(max, 1, _POW2_32, "max",
-                                 "Must be positive and <= 2^32");
+      throw new RangeError.range(
+          max, 1, _POW2_32, "max", "Must be positive and <= 2^32");
     }
     if ((max & -max) == max) {
       // Fast case for powers of two.
       _nextState();
       return _state[_kSTATE_LO] & (max - 1);
     }
 
     var rnd32;
     var result;
     do {
@@ skipping 29 matching lines @@
   // Get a seed from the VM's random number provider.
   static Uint32List _initialSeed() native "Random_initialSeed";
 
   static int _nextSeed() {
     // Trigger the PRNG once to change the internal state.
     _prng._nextState();
     return _prng._state[_kSTATE_LO];
   }
 }
 
-
 class _SecureRandom implements Random {
   _SecureRandom() {
     // Throw early in constructor if entropy source is not hooked up.
     _getBytes(1);
   }
 
   // Return count bytes of entropy as a positive integer; count <= 8.
   static int _getBytes(int count) native "SecureRandom_getBytes";
 
   int nextInt(int max) {
     RangeError.checkValueInInterval(
         max, 1, _POW2_32, "max", "Must be positive and <= 2^32");
     final byteCount = ((max - 1).bitLength + 7) >> 3;
     if (byteCount == 0) {
-      return 0;  // Not random if max == 1.
+      return 0; // Not random if max == 1.
     }
     var rnd;
     var result;
     do {
       rnd = _getBytes(byteCount);
       result = rnd % max;
     } while ((rnd - result + max) > (1 << (byteCount << 3)));
     return result;
   }
 
   double nextDouble() {
     return (_getBytes(7) >> 3) / _POW2_53_D;
   }
 
   bool nextBool() {
     return _getBytes(1).isEven;
   }
 
   // Constants used by the algorithm.
   static const _POW2_32 = 1 << 32;
   static const _POW2_53_D = 1.0 * (1 << 53);
 }
-