/// <summary>
/// 15.7.4.7
/// </summary>
/// <param name="target"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public JsInstance ToPrecisionImpl(JsNumber target, JsInstance[] parameters)
{
if (double.IsInfinity(target.ToNumber()) || double.IsNaN(target.ToNumber()))
{
return(ToStringImpl(target, new JsInstance[0]));
}
if (parameters.Length == 0)
{
throw new JsException(Global.SyntaxErrorClass.New("precision missing"));
}
if (parameters[0] == JsUndefined.Instance)
{
return(ToStringImpl(target, new JsInstance[0]));
}
int precision = 0;
if (parameters.Length > 0)
{
precision = Convert.ToInt32(parameters[0].ToNumber());
}
if (precision < 1 || precision > 21)
{
throw new JsException(Global.RangeErrorClass.New("precision must be between 1 and 21"));
}
// Get the number of decimals
string str = target.ToNumber().ToString("e23", CultureInfo.InvariantCulture);
int decimals = str.IndexOfAny(new char[] { '.', 'e' });
decimals = decimals == -1 ? str.Length : decimals;
precision -= decimals;
precision = precision < 1 ? 1 : precision;
return(Global.StringClass.New(target.ToNumber().ToString("f" + precision, CultureInfo.InvariantCulture)));
}
/// <summary>
/// 15.7.4.6
/// </summary>
/// <param name="target"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public JsInstance ToExponentialImpl(JsNumber target, JsInstance[] parameters)
{
if (double.IsInfinity(target.ToNumber()) || double.IsNaN(target.ToNumber()))
{
return(ToStringImpl(target, new JsInstance[0]));
}
int fractions = 16;
if (parameters.Length > 0)
{
fractions = Convert.ToInt32(parameters[0].ToNumber());
}
if (fractions > 20 || fractions < 0)
{
throw new JsException(Global.SyntaxErrorClass.New("Fraction Digits must be greater than 0 and lesser than 20"));
}
string format = String.Concat("#.", new String('0', fractions), "e+0");
return(Global.StringClass.New(target.ToNumber().ToString(format, CultureInfo.InvariantCulture)));
}
/// <summary>
/// 15.7.4.5
/// </summary>
/// <param name="target"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public JsInstance ToFixedImpl(JsNumber target, JsInstance[] parameters)
{
int fractions = 0;
if (parameters.Length > 0)
{
fractions = Convert.ToInt32(parameters[0].ToNumber());
}
if (fractions > 20 || fractions < 0)
{
throw new JsException(Global.SyntaxErrorClass.New("Fraction Digits must be greater than 0 and lesser than 20"));
}
if (target == Global.NaN)
{
return(Global.StringClass.New(target.ToString()));
}
return(Global.StringClass.New(target.ToNumber().ToString("f" + fractions, CultureInfo.InvariantCulture)));
}
/// <summary>
/// 15.7.4.7
/// </summary>
/// <param name="target"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public JsInstance ToPrecisionImpl(JsNumber target, JsInstance[] parameters)
{
if (double.IsInfinity(target.ToNumber()) || double.IsNaN(target.ToNumber()))
{
return ToStringImpl(target, new JsInstance[0]);
}
if (parameters.Length == 0)
{
throw new JsException(Global.SyntaxErrorClass.New("precision missing"));
}
if (parameters[0] == JsUndefined.Instance)
{
return ToStringImpl(target, new JsInstance[0]);
}
int precision = 0;
if (parameters.Length > 0)
{
precision = Convert.ToInt32(parameters[0].ToNumber());
}
if (precision < 1 || precision > 21)
{
throw new JsException(Global.RangeErrorClass.New("precision must be between 1 and 21"));
}
// Get the number of decimals
string str = target.ToNumber().ToString("e23", CultureInfo.InvariantCulture);
int decimals = str.IndexOfAny(new char[] { '.', 'e' });
decimals = decimals == -1 ? str.Length : decimals;
precision -= decimals;
precision = precision < 1 ? 1 : precision;
return Global.StringClass.New(target.ToNumber().ToString("f" + precision, CultureInfo.InvariantCulture));
}
/// <summary>
/// 15.7.4.6
/// </summary>
/// <param name="target"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public JsInstance ToExponentialImpl(JsNumber target, JsInstance[] parameters)
{
if (double.IsInfinity(target.ToNumber()) || double.IsNaN(target.ToNumber()))
{
return ToStringImpl(target, new JsInstance[0]);
}
int fractions = 16;
if (parameters.Length > 0)
{
fractions = Convert.ToInt32(parameters[0].ToNumber());
}
if (fractions > 20 || fractions < 0)
{
throw new JsException(Global.SyntaxErrorClass.New("Fraction Digits must be greater than 0 and lesser than 20"));
}
string format = String.Concat("#.", new String('0', fractions), "e+0");
return Global.StringClass.New(target.ToNumber().ToString(format, CultureInfo.InvariantCulture));
}
/// <summary>
/// 15.7.4.5
/// </summary>
/// <param name="target"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public JsInstance ToFixedImpl(JsNumber target, JsInstance[] parameters)
{
int fractions = 0;
if (parameters.Length > 0)
{
fractions = Convert.ToInt32(parameters[0].ToNumber());
}
if (fractions > 20 || fractions < 0)
{
throw new JsException(Global.SyntaxErrorClass.New("Fraction Digits must be greater than 0 and lesser than 20"));
}
if (target == Global.NaN)
{
return Global.StringClass.New(target.ToString());
}
return Global.StringClass.New(target.ToNumber().ToString("f" + fractions, CultureInfo.InvariantCulture));
}