private static JsValue Cbrt(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(x))
{
return(JsNumber.DoubleNaN);
}
else if (NumberInstance.IsPositiveZero(x) || NumberInstance.IsNegativeZero(x))
{
return(x);
}
else if (double.IsPositiveInfinity(x))
{
return(JsNumber.DoublePositiveInfinity);
}
else if (double.IsNegativeInfinity(x))
{
return(JsNumber.DoubleNegativeInfinity);
}
if (System.Math.Sign(x) >= 0)
{
return(System.Math.Pow(x, 1.0 / 3.0));
}
return(-1 * System.Math.Pow(System.Math.Abs(x), 1.0 / 3.0));
}
private static JsValue Min(JsValue thisObject, JsValue[] arguments)
{
if (arguments.Length == 0)
{
return(JsNumber.DoublePositiveInfinity);
}
double min = TypeConverter.ToNumber(arguments.At(0));
for (int i = 0; i < arguments.Length; i++)
{
var value = TypeConverter.ToNumber(arguments[i]);
if (min == 0 && value == 0)
{
min = NumberInstance.IsNegativeZero(min)
? min
: value;
}
else
{
min = System.Math.Min(min, value);
}
}
return(min);
}
/// <summary>
/// https://tc39.es/ecma262/#sec-math.min
/// </summary>
private static JsValue Min(JsValue thisObject, JsValue[] arguments)
{
if (arguments.Length == 0)
{
return(JsNumber.DoublePositiveInfinity);
}
var lowest = double.PositiveInfinity;
foreach (var number in Coerced(arguments))
{
if (double.IsNaN(number))
{
return(JsNumber.DoubleNaN);
}
if (NumberInstance.IsNegativeZero(number) && NumberInstance.IsPositiveZero(lowest))
{
lowest = JsNumber.NegativeZero._value;
}
if (number < lowest)
{
lowest = number;
}
}
return(lowest);
}
private static JsValue Ceil(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(x))
{
return(double.NaN);
}
else if (NumberInstance.IsPositiveZero(x))
{
return(+0);
}
else if (NumberInstance.IsNegativeZero(x))
{
return(-0);
}
else if (double.IsPositiveInfinity(x))
{
return(double.PositiveInfinity);
}
else if (double.IsNegativeInfinity(x))
{
return(double.NegativeInfinity);
}
return(System.Math.Ceiling(x));
}
private static JsValue Floor(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(x))
{
return(JsNumber.DoubleNaN);
}
else if (NumberInstance.IsPositiveZero(x))
{
return(JsNumber.PositiveZero);
}
else if (NumberInstance.IsNegativeZero(x))
{
return(JsNumber.NegativeZero);
}
else if (double.IsPositiveInfinity(x))
{
return(JsNumber.DoublePositiveInfinity);
}
else if (double.IsNegativeInfinity(x))
{
return(JsNumber.DoubleNegativeInfinity);
}
return(System.Math.Floor(x));
}
private static JsValue Ceil(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(x))
{
return(JsNumber.DoubleNaN);
}
else if (NumberInstance.IsPositiveZero(x))
{
return(JsNumber.PositiveZero);
}
else if (NumberInstance.IsNegativeZero(x))
{
return(JsNumber.NegativeZero);
}
else if (double.IsPositiveInfinity(x))
{
return(JsNumber.DoublePositiveInfinity);
}
else if (double.IsNegativeInfinity(x))
{
return(JsNumber.DoubleNegativeInfinity);
}
#if NETFRAMEWORK
if (x < 0 && x > -1)
{
return(JsNumber.NegativeZero);
}
#endif
return(System.Math.Ceiling(x));
}
private static JsValue Sign(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(x))
{
return(JsNumber.DoubleNaN);
}
if (NumberInstance.IsPositiveZero(x) || NumberInstance.IsNegativeZero(x))
{
return(x);
}
if (double.IsPositiveInfinity(x))
{
return(1);
}
if (double.IsNegativeInfinity(x))
{
return(-1);
}
return(System.Math.Sign(x));
}
/// <summary>
/// https://tc39.es/ecma262/#sec-math.max
/// </summary>
private static JsValue Max(JsValue thisObject, JsValue[] arguments)
{
if (arguments.Length == 0)
{
return(JsNumber.DoubleNegativeInfinity);
}
var highest = double.NegativeInfinity;
foreach (var number in Coerced(arguments))
{
if (double.IsNaN(number))
{
return(JsNumber.DoubleNaN);
}
if (NumberInstance.IsPositiveZero(number) && NumberInstance.IsNegativeZero(highest))
{
highest = 0;
}
if (number > highest)
{
highest = number;
}
}
return(highest);
}
private static JsValue Asinh(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsInfinity(x) || NumberInstance.IsPositiveZero(x) || NumberInstance.IsNegativeZero(x))
{
return(x);
}
return(System.Math.Log(x + System.Math.Sqrt(x * x + 1.0)));
}
private JsValue Divide(JsValue lval, JsValue rval)
{
if (lval == Undefined.Instance || rval == Undefined.Instance)
{
return(Undefined.Instance);
}
else
{
var lN = TypeConverter.ToNumber(lval);
var rN = TypeConverter.ToNumber(rval);
if (double.IsNaN(rN) || double.IsNaN(lN))
{
return(double.NaN);
}
if (double.IsInfinity(lN) && double.IsInfinity(rN))
{
return(double.NaN);
}
if (double.IsInfinity(lN) && rN.Equals(0))
{
if (NumberInstance.IsNegativeZero(rN))
{
return(-lN);
}
return(lN);
}
if (lN.Equals(0) && rN.Equals(0))
{
return(double.NaN);
}
if (rN.Equals(0))
{
if (NumberInstance.IsNegativeZero(rN))
{
return(lN > 0 ? -double.PositiveInfinity : -double.NegativeInfinity);
}
return(lN > 0 ? double.PositiveInfinity : double.NegativeInfinity);
}
return(lN / rN);
}
}
private static JsValue DivideComplex(JsValue lval, JsValue rval)
{
if (lval.IsUndefined() || rval.IsUndefined())
{
return(Undefined.Instance);
}
else
{
var lN = TypeConverter.ToNumber(lval);
var rN = TypeConverter.ToNumber(rval);
if (double.IsNaN(rN) || double.IsNaN(lN))
{
return(JsNumber.DoubleNaN);
}
if (double.IsInfinity(lN) && double.IsInfinity(rN))
{
return(JsNumber.DoubleNaN);
}
if (double.IsInfinity(lN) && rN == 0)
{
if (NumberInstance.IsNegativeZero(rN))
{
return(-lN);
}
return(lN);
}
if (lN == 0 && rN == 0)
{
return(JsNumber.DoubleNaN);
}
if (rN == 0)
{
if (NumberInstance.IsNegativeZero(rN))
{
return(lN > 0 ? -double.PositiveInfinity : -double.NegativeInfinity);
}
return(lN > 0 ? double.PositiveInfinity : double.NegativeInfinity);
}
return(lN / rN);
}
}
private static JsValue Expm1(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(x) || NumberInstance.IsPositiveZero(x) || NumberInstance.IsNegativeZero(x) || double.IsPositiveInfinity(x))
{
return(arguments.At(0));
}
if (double.IsNegativeInfinity(x))
{
return(JsNumber.DoubleNegativeOne);
}
return(System.Math.Exp(x) - 1.0);
}
private static JsValue Asin(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(x) || (x > 1) || (x < -1))
{
return(JsNumber.DoubleNaN);
}
else if (NumberInstance.IsPositiveZero(x) || NumberInstance.IsNegativeZero(x))
{
return(x);
}
return(System.Math.Asin(x));
}
private static JsValue Atanh(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(x))
{
return(JsNumber.DoubleNaN);
}
if (NumberInstance.IsPositiveZero(x) || NumberInstance.IsNegativeZero(x))
{
return(x);
}
return(0.5 * System.Math.Log((1.0 + x) / (1.0 - x)));
}
public static bool SameValue(JsValue x, JsValue y)
{
var typea = TypeConverter.GetPrimitiveType(x);
var typeb = TypeConverter.GetPrimitiveType(y);
if (typea != typeb)
{
return(false);
}
if (typea == Types.None)
{
return(true);
}
if (typea == Types.Number)
{
var nx = TypeConverter.ToNumber(x);
var ny = TypeConverter.ToNumber(y);
if (double.IsNaN(nx) && double.IsNaN(ny))
{
return(true);
}
if (nx.Equals(ny))
{
if (nx.Equals(0))
{
// +0 !== -0
return(NumberInstance.IsNegativeZero(nx) == NumberInstance.IsNegativeZero(ny));
}
return(true);
}
return(false);
}
if (typea == Types.String)
{
return(TypeConverter.ToString(x) == TypeConverter.ToString(y));
}
if (typea == Types.Boolean)
{
return(TypeConverter.ToBoolean(x) == TypeConverter.ToBoolean(y));
}
return(x == y);
}
private static JsValue Max(JsValue thisObject, JsValue[] arguments)
{
if (arguments.Length == 0)
{
return(JsNumber.DoubleNegativeInfinity);
}
double max = TypeConverter.ToNumber(arguments.At(0));
if (double.IsNaN(max))
{
return(JsNumber.DoubleNaN);
}
for (int i = 0; i < arguments.Length; i++)
{
var value = TypeConverter.ToNumber(arguments[i]);
if (double.IsNaN(value))
{
return(JsNumber.DoubleNaN);
}
if (max == 0 && value == 0)
{
max = NumberInstance.IsNegativeZero(value)
? max
: value;
}
else
{
max = System.Math.Max(max, value);
}
}
return(max);
}
internal bool IsNegativeZero()
{
return(NumberInstance.IsNegativeZero(_value));
}
private static JsValue Atan2(JsValue thisObject, JsValue[] arguments)
{
var y = TypeConverter.ToNumber(arguments[0]);
var x = TypeConverter.ToNumber(arguments[1]);
// If either x or y is NaN, the result is NaN.
if (double.IsNaN(x) || double.IsNaN(y))
{
return(double.NaN);
}
if (y > 0 && x == 0)
{
return(System.Math.PI / 2);
}
if (NumberInstance.IsPositiveZero(y))
{
// If y is +0 and x>0, the result is +0.
if (x > 0)
{
return(+0);
}
// If y is +0 and x is +0, the result is +0.
if (NumberInstance.IsPositiveZero(x))
{
return(+0);
}
// If y is +0 and x is −0, the result is an implementation-dependent approximation to +π.
if (NumberInstance.IsNegativeZero(x))
{
return(System.Math.PI);
}
// If y is +0 and x<0, the result is an implementation-dependent approximation to +π.
if (x < 0)
{
return(System.Math.PI);
}
}
if (NumberInstance.IsNegativeZero(y))
{
// If y is −0 and x>0, the result is −0.
if (x > 0)
{
return(-0);
}
// If y is −0 and x is +0, the result is −0.
if (NumberInstance.IsPositiveZero(x))
{
return(-0);
}
// If y is −0 and x is −0, the result is an implementation-dependent approximation to −π.
if (NumberInstance.IsNegativeZero(x))
{
return(-System.Math.PI);
}
// If y is −0 and x<0, the result is an implementation-dependent approximation to −π.
if (x < 0)
{
return(-System.Math.PI);
}
}
// If y<0 and x is +0, the result is an implementation-dependent approximation to −π/2.
// If y<0 and x is −0, the result is an implementation-dependent approximation to −π/2.
if (y < 0 && x == 0)
{
return(-System.Math.PI / 2);
}
// If y>0 and y is finite and x is +∞, the result is +0.
if (y > 0 && !double.IsInfinity(y))
{
if (double.IsPositiveInfinity(x))
{
return(+0);
}
// If y>0 and y is finite and x is −∞, the result if an implementation-dependent approximation to +π.
if (double.IsNegativeInfinity(x))
{
return(System.Math.PI);
}
}
// If y<0 and y is finite and x is +∞, the result is −0.
// If y<0 and y is finite and x is −∞, the result is an implementation-dependent approximation to −π.
if (y < 0 && !double.IsInfinity(y))
{
if (double.IsPositiveInfinity(x))
{
return(-0);
}
// If y>0 and y is finite and x is −∞, the result if an implementation-dependent approximation to +π.
if (double.IsNegativeInfinity(x))
{
return(-System.Math.PI);
}
}
// If y is +∞ and x is finite, the result is an implementation-dependent approximation to +π/2.
if (double.IsPositiveInfinity(y) && !double.IsInfinity(x))
{
return(System.Math.PI / 2);
}
// If y is −∞ and x is finite, the result is an implementation-dependent approximation to −π/2.
if (double.IsNegativeInfinity(y) && !double.IsInfinity(x))
{
return(-System.Math.PI / 2);
}
// If y is +∞ and x is +∞, the result is an implementation-dependent approximation to +π/4.
if (double.IsPositiveInfinity(y) && double.IsPositiveInfinity(x))
{
return(System.Math.PI / 4);
}
// If y is +∞ and x is −∞, the result is an implementation-dependent approximation to +3π/4.
if (double.IsPositiveInfinity(y) && double.IsNegativeInfinity(x))
{
return(3 * System.Math.PI / 4);
}
// If y is −∞ and x is +∞, the result is an implementation-dependent approximation to −π/4.
if (double.IsNegativeInfinity(y) && double.IsPositiveInfinity(x))
{
return(-System.Math.PI / 4);
}
// If y is −∞ and x is −∞, the result is an implementation-dependent approximation to −3π/4.
if (double.IsNegativeInfinity(y) && double.IsNegativeInfinity(x))
{
return(-3 * System.Math.PI / 4);
}
return(System.Math.Atan2(y, x));
}
private static JsValue Pow(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments[0]);
var y = TypeConverter.ToNumber(arguments[1]);
if (double.IsNaN(y))
{
return(double.NaN);
}
if (y == 0)
{
return(1);
}
if (double.IsNaN(x) && y != 0)
{
return(double.NaN);
}
if (System.Math.Abs(x) > 1)
{
if (double.IsPositiveInfinity(y))
{
return(double.PositiveInfinity);
}
if (double.IsNegativeInfinity(y))
{
return(+0);
}
}
if (System.Math.Abs(x) == 1)
{
if (double.IsInfinity(y))
{
return(double.NaN);
}
}
if (System.Math.Abs(x) < 1)
{
if (double.IsPositiveInfinity(y))
{
return(0);
}
if (double.IsNegativeInfinity(y))
{
return(double.PositiveInfinity);
}
}
if (double.IsPositiveInfinity(x))
{
if (y > 0)
{
return(double.PositiveInfinity);
}
if (y < 0)
{
return(+0);
}
}
if (double.IsNegativeInfinity(x))
{
if (y > 0)
{
if (System.Math.Abs(y % 2) == 1)
{
return(double.NegativeInfinity);
}
return(double.PositiveInfinity);
}
if (y < 0)
{
if (System.Math.Abs(y % 2) == 1)
{
return(-0);
}
return(+0);
}
}
if (NumberInstance.IsPositiveZero(x))
{
// If x is +0 and y>0, the result is +0.
if (y > 0)
{
return(0);
}
// If x is +0 and y<0, the result is +∞.
if (y < 0)
{
return(double.PositiveInfinity);
}
}
if (NumberInstance.IsNegativeZero(x))
{
if (y > 0)
{
// If x is −0 and y>0 and y is an odd integer, the result is −0.
if (System.Math.Abs(y % 2) == 1)
{
return(-0);
}
// If x is −0 and y>0 and y is not an odd integer, the result is +0.
return(+0);
}
if (y < 0)
{
// If x is −0 and y<0 and y is an odd integer, the result is −∞.
if (System.Math.Abs(y % 2) == 1)
{
return(double.NegativeInfinity);
}
// If x is −0 and y<0 and y is not an odd integer, the result is +∞.
return(double.PositiveInfinity);
}
}
// If x<0 and x is finite and y is finite and y is not an integer, the result is NaN.
if (x < 0 && !double.IsInfinity(x) && !double.IsInfinity(y) && (int)y != y)
{
return(double.NaN);
}
return(System.Math.Pow(x, y));
}
private static JsValue Atan2(JsValue thisObject, JsValue[] arguments)
{
var y = TypeConverter.ToNumber(arguments.At(0));
var x = TypeConverter.ToNumber(arguments.At(1));
// If either x or y is NaN, the result is NaN.
if (Money.IsNaN(x) || Money.IsNaN(y))
{
return(Money.NaN);
}
if (y > 0 && x.Equals(0))
{
return((Money)(decimal)(System.Math.PI / 2));
}
if (NumberInstance.IsPositiveZero(y))
{
// If y is +0 and x>0, the result is +0.
if (x > 0)
{
return(+0);
}
// If y is +0 and x is +0, the result is +0.
if (NumberInstance.IsPositiveZero(x))
{
return(+0);
}
// If y is +0 and x is −0, the result is an implementation-dependent approximation to +π.
if (NumberInstance.IsNegativeZero(x))
{
return((Money)(decimal)System.Math.PI);
}
// If y is +0 and x<0, the result is an implementation-dependent approximation to +π.
if (x < 0)
{
return((Money)(decimal)System.Math.PI);
}
}
if (NumberInstance.IsNegativeZero(y))
{
// If y is −0 and x>0, the result is −0.
if (x > 0)
{
return(-0);
}
// If y is −0 and x is +0, the result is −0.
if (NumberInstance.IsPositiveZero(x))
{
return(-0);
}
// If y is −0 and x is −0, the result is an implementation-dependent approximation to −π.
if (NumberInstance.IsNegativeZero(x))
{
return((Money)(decimal) - System.Math.PI);
}
// If y is −0 and x<0, the result is an implementation-dependent approximation to −π.
if (x < 0)
{
return((Money)(decimal) - System.Math.PI);
}
}
// If y<0 and x is +0, the result is an implementation-dependent approximation to −π/2.
// If y<0 and x is −0, the result is an implementation-dependent approximation to −π/2.
if (y < 0 && x.Equals(0))
{
return((Money)(decimal) - System.Math.PI / 2);
}
// If y>0 and y is finite and x is +∞, the result is +0.
if (y > 0 && !Money.IsInfinity(y))
{
if (Money.IsPositiveInfinity(x))
{
return(+0);
}
// If y>0 and y is finite and x is −∞, the result if an implementation-dependent approximation to +π.
if (Money.IsNegativeInfinity(x))
{
return((Money)(decimal)System.Math.PI);
}
}
// If y<0 and y is finite and x is +∞, the result is −0.
// If y<0 and y is finite and x is −∞, the result is an implementation-dependent approximation to −π.
if (y < 0 && !Money.IsInfinity(y))
{
if (Money.IsPositiveInfinity(x))
{
return(-0);
}
// If y>0 and y is finite and x is −∞, the result if an implementation-dependent approximation to +π.
if (Money.IsNegativeInfinity(x))
{
return((Money)(decimal) - System.Math.PI);
}
}
// If y is +∞ and x is finite, the result is an implementation-dependent approximation to +π/2.
if (Money.IsPositiveInfinity(y) && !Money.IsInfinity(x))
{
return((Money)(decimal)System.Math.PI / 2);
}
// If y is −∞ and x is finite, the result is an implementation-dependent approximation to −π/2.
if (Money.IsNegativeInfinity(y) && !Money.IsInfinity(x))
{
return((Money)(decimal) - System.Math.PI / 2);
}
// If y is +∞ and x is +∞, the result is an implementation-dependent approximation to +π/4.
if (Money.IsPositiveInfinity(y) && Money.IsPositiveInfinity(x))
{
return((Money)(decimal)System.Math.PI / 4);
}
// If y is +∞ and x is −∞, the result is an implementation-dependent approximation to +3π/4.
if (Money.IsPositiveInfinity(y) && Money.IsNegativeInfinity(x))
{
return((Money)(decimal)(3 * System.Math.PI / 4));
}
// If y is −∞ and x is +∞, the result is an implementation-dependent approximation to −π/4.
if (Money.IsNegativeInfinity(y) && Money.IsPositiveInfinity(x))
{
return((Money)(decimal) - System.Math.PI / 4);
}
// If y is −∞ and x is −∞, the result is an implementation-dependent approximation to −3π/4.
if (Money.IsNegativeInfinity(y) && Money.IsNegativeInfinity(x))
{
return((Money)(decimal)(-3 * System.Math.PI / 4));
}
return((Money)(decimal)System.Math.Atan2(y.ToDouble(), x.ToDouble()));
}
private static JsValue Pow(JsValue thisObject, JsValue[] arguments)
{
var x = TypeConverter.ToNumber(arguments.At(0));
var y = TypeConverter.ToNumber(arguments.At(1));
if (Money.IsNaN(y))
{
return(Money.NaN);
}
if (y.Equals(0))
{
return(1);
}
if (Money.IsNaN(x) && !y.Equals(0))
{
return(Money.NaN);
}
if (Money.Abs(x) > 1)
{
if (Money.IsPositiveInfinity(y))
{
return(Money.PositiveInfinity);
}
if (Money.IsNegativeInfinity(y))
{
return(+0);
}
}
if (Money.Abs(x).Equals(1))
{
if (Money.IsInfinity(y))
{
return(Money.NaN);
}
}
if (Money.Abs(x) < 1)
{
if (Money.IsPositiveInfinity(y))
{
return(0);
}
if (Money.IsNegativeInfinity(y))
{
return(Money.PositiveInfinity);
}
}
if (Money.IsPositiveInfinity(x))
{
if (y > 0)
{
return(Money.PositiveInfinity);
}
if (y < 0)
{
return(+0);
}
}
if (Money.IsNegativeInfinity(x))
{
if (y > 0)
{
if (Money.Abs(y % 2).Equals(1))
{
return(Money.NegativeInfinity);
}
return(Money.PositiveInfinity);
}
if (y < 0)
{
if (Money.Abs(y % 2).Equals(1))
{
return(-0);
}
return(+0);
}
}
if (NumberInstance.IsPositiveZero(x))
{
// If x is +0 and y>0, the result is +0.
if (y > 0)
{
return(0);
}
// If x is +0 and y<0, the result is +∞.
if (y < 0)
{
return(Money.PositiveInfinity);
}
}
if (NumberInstance.IsNegativeZero(x))
{
if (y > 0)
{
// If x is −0 and y>0 and y is an odd integer, the result is −0.
if (Money.Abs(y % 2).Equals(1))
{
return(-0);
}
// If x is −0 and y>0 and y is not an odd integer, the result is +0.
return(+0);
}
if (y < 0)
{
// If x is −0 and y<0 and y is an odd integer, the result is −∞.
if (Money.Abs(y % 2).Equals(1))
{
return(Money.NegativeInfinity);
}
// If x is −0 and y<0 and y is not an odd integer, the result is +∞.
return(Money.PositiveInfinity);
}
}
// If x<0 and x is finite and y is finite and y is not an integer, the result is NaN.
if (x < 0 && !Money.IsInfinity(x) && !Money.IsInfinity(y) && !y.Equals((int)y))
{
return(Money.NaN);
}
return((Money)(decimal)System.Math.Pow(x.ToDouble(), y.ToDouble()));
}
private static JsValue HandlePowUnlikely(double y, double x)
{
if (double.IsNaN(y))
{
return(JsNumber.DoubleNaN);
}
if (double.IsNaN(x))
{
return(JsNumber.DoubleNaN);
}
var absX = System.Math.Abs(x);
if (absX > 1)
{
if (double.IsPositiveInfinity(y))
{
return(JsNumber.DoublePositiveInfinity);
}
if (double.IsNegativeInfinity(y))
{
return(JsNumber.PositiveZero);
}
}
if (absX == 1)
{
if (double.IsInfinity(y))
{
return(JsNumber.DoubleNaN);
}
}
if (absX < 1)
{
if (double.IsPositiveInfinity(y))
{
return(0);
}
if (double.IsNegativeInfinity(y))
{
return(JsNumber.DoublePositiveInfinity);
}
}
if (double.IsPositiveInfinity(x))
{
if (y > 0)
{
return(JsNumber.DoublePositiveInfinity);
}
if (y < 0)
{
return(JsNumber.PositiveZero);
}
}
if (double.IsNegativeInfinity(x))
{
if (y > 0)
{
if (System.Math.Abs(y % 2).Equals(1))
{
return(JsNumber.DoubleNegativeInfinity);
}
return(JsNumber.DoublePositiveInfinity);
}
if (y < 0)
{
if (System.Math.Abs(y % 2).Equals(1))
{
return(JsNumber.NegativeZero);
}
return(JsNumber.PositiveZero);
}
}
if (NumberInstance.IsPositiveZero(x))
{
// If x is +0 and y>0, the result is +0.
if (y > 0)
{
return(0);
}
// If x is +0 and y<0, the result is +∞.
if (y < 0)
{
return(JsNumber.DoublePositiveInfinity);
}
}
if (NumberInstance.IsNegativeZero(x))
{
if (y > 0)
{
// If x is −0 and y>0 and y is an odd integer, the result is −0.
if (System.Math.Abs(y % 2).Equals(1))
{
return(JsNumber.NegativeZero);
}
// If x is −0 and y>0 and y is not an odd integer, the result is +0.
return(JsNumber.PositiveZero);
}
if (y < 0)
{
// If x is −0 and y<0 and y is an odd integer, the result is −∞.
if (System.Math.Abs(y % 2).Equals(1))
{
return(JsNumber.DoubleNegativeInfinity);
}
// If x is −0 and y<0 and y is not an odd integer, the result is +∞.
return(JsNumber.DoublePositiveInfinity);
}
}
// If x<0 and x is finite and y is finite and y is not an integer, the result is NaN.
if (x < 0 && !double.IsInfinity(x) && !double.IsInfinity(y) && !y.Equals((int)y))
{
return(JsNumber.DoubleNaN);
}
return(System.Math.Pow(x, y));
}