public static IJsValue ArithEval(IEnvironment environment, IJsValue lhs, IJsValue rhs,
Func<double, double, double> mathOperator)
{
/*
var l = lhs.ToNumber();
if (double.IsNaN(l) || double.IsInfinity(l))
{
return environment.CreateNumber(double.NaN);
}
var r = rhs.ToNumber();
if (double.IsNaN(r) || double.IsInfinity(r))
{
return environment.CreateNumber(double.NaN);
}
return environment.CreateNumber(mathOperator(l, r));
*/
var v = mathOperator(lhs.ToNumber(), rhs.ToNumber());
return environment.CreateNumber(double.IsInfinity(v) ? double.NaN : v);
}
public static IJsValue RelationalEval(IEnvironment environment, IJsValue lhs, IJsValue rhs,
Func<double, double, bool> relationalOperator,
Func<string, string, bool> stringRelationalOperator)
{
if ((lhs.ToPrimitive() is string) || (rhs.ToPrimitive() is string))
{
return environment.CreateBool(stringRelationalOperator(lhs.ToString(), rhs.ToString()));
}
var ln = lhs.ToNumber();
if (double.IsNaN(ln))
{
return JsUndefined.Value;
}
var rn = rhs.ToNumber();
if (double.IsNaN(rn))
{
return JsUndefined.Value;
}
return environment.CreateBool(relationalOperator(ln, rn));
}
public static IJsValue Neg(IEnvironment environment, IJsValue value)
{
return environment.CreateNumber(-value.ToNumber());
}
