/// <summary>
/// http://www.ecma-international.org/ecma-262/5.1/#sec-15.1.2.2
/// </summary>
public static JsValue ParseInt(JsValue thisObject, JsValue[] arguments)
{
string inputString = TypeConverter.ToString(arguments.At(0));
var s = StringPrototype.TrimEx(inputString);
var sign = 1;
if (!System.String.IsNullOrEmpty(s))
{
if (s[0] == '-')
{
sign = -1;
}
if (s[0] == '-' || s[0] == '+')
{
s = s.Substring(1);
}
}
var stripPrefix = true;
int radix = arguments.Length > 1 ? TypeConverter.ToInt32(arguments[1]) : 0;
if (radix == 0)
{
if (s.Length >= 2 && s.StartsWith("0x") || s.StartsWith("0X"))
{
radix = 16;
}
else
{
radix = 10;
}
}
else if (radix < 2 || radix > 36)
{
return(double.NaN);
}
else if (radix != 16)
{
stripPrefix = false;
}
if (stripPrefix && s.Length >= 2 && s.StartsWith("0x") || s.StartsWith("0X"))
{
s = s.Substring(2);
}
try
{
return(sign * Parse(s, radix).AsNumber());
}
catch
{
return(double.NaN);
}
}
private string[] ParseArgumentNames(string parameterDeclaration)
{
string[] values = parameterDeclaration.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
var newValues = new string[values.Length];
for (var i = 0; i < values.Length; i++)
{
newValues[i] = StringPrototype.TrimEx(values[i]);
}
return(newValues);
}
/// <summary>
/// http://www.ecma-international.org/ecma-262/5.1/#sec-9.3
/// </summary>
/// <param name="o"></param>
/// <returns></returns>
public static double ToNumber(JsValue o)
{
// check number first as this is what is usually expected
if (o.IsNumber())
{
return(o.AsNumber());
}
if (o.IsObject())
{
var p = o.AsObject() as IPrimitiveInstance;
if (p != null)
{
o = p.PrimitiveValue;
}
}
if (o == Undefined.Instance)
{
return(double.NaN);
}
if (o == Null.Instance)
{
return(0);
}
if (o.IsBoolean())
{
return(o.AsBoolean() ? 1 : 0);
}
if (o.IsString())
{
var s = StringPrototype.TrimEx(o.AsString());
if (String.IsNullOrEmpty(s))
{
return(0);
}
if ("+Infinity".Equals(s) || "Infinity".Equals(s))
{
return(double.PositiveInfinity);
}
if ("-Infinity".Equals(s))
{
return(double.NegativeInfinity);
}
// todo: use a common implementation with JavascriptParser
try
{
if (!s.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
{
var start = s[0];
if (start != '+' && start != '-' && start != '.' && !char.IsDigit(start))
{
return(double.NaN);
}
double n = Double.Parse(s,
NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign |
NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite |
NumberStyles.AllowExponent, CultureInfo.InvariantCulture);
if (s.StartsWith("-") && n.Equals(0))
{
return(-0.0);
}
return(n);
}
int i = int.Parse(s.Substring(2), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
return(i);
}
catch (OverflowException)
{
return(s.StartsWith("-") ? double.NegativeInfinity : double.PositiveInfinity);
}
catch
{
return(double.NaN);
}
}
return(ToNumber(ToPrimitive(o, Types.Number)));
}
private static double ToNumber(string input)
{
// eager checks to save time and trimming
if (string.IsNullOrEmpty(input))
{
return(0);
}
char first = input[0];
if (input.Length == 1 && first >= '0' && first <= '9')
{
// simple constant number
return(first - '0');
}
var s = StringPrototype.TrimEx(input);
if (s.Length == 0)
{
return(0);
}
if (s.Length == 8 || s.Length == 9)
{
if ("+Infinity" == s || "Infinity" == s)
{
return(double.PositiveInfinity);
}
if ("-Infinity" == s)
{
return(double.NegativeInfinity);
}
}
// todo: use a common implementation with JavascriptParser
try
{
if (s.Length > 2 && s[0] == '0' && char.IsLetter(s[1]))
{
int fromBase = 0;
if (s[1] == 'x' || s[1] == 'X')
{
fromBase = 16;
}
if (s[1] == 'o' || s[1] == 'O')
{
fromBase = 8;
}
if (s[1] == 'b' || s[1] == 'B')
{
fromBase = 2;
}
if (fromBase > 0)
{
return(Convert.ToInt32(s.Substring(2), fromBase));
}
}
var start = s[0];
if (start != '+' && start != '-' && start != '.' && !char.IsDigit(start))
{
return(double.NaN);
}
double n = double.Parse(s,
NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign |
NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite |
NumberStyles.AllowExponent, CultureInfo.InvariantCulture);
if (s.StartsWith("-") && n == 0)
{
return(-0.0);
}
return(n);
}
catch (OverflowException)
{
return(s.StartsWith("-") ? double.NegativeInfinity : double.PositiveInfinity);
}
catch
{
return(double.NaN);
}
}
private static double ToNumber(string input)
{
// eager checks to save time and trimming
if (string.IsNullOrEmpty(input))
{
return(0);
}
var s = StringPrototype.IsWhiteSpaceEx(input[0]) || StringPrototype.IsWhiteSpaceEx(input[input.Length - 1])
? StringPrototype.TrimEx(input)
: input;
if (s.Length == 0)
{
return(0);
}
if (s.Length == 8 || s.Length == 9)
{
if ("+Infinity" == s || "Infinity" == s)
{
return(double.PositiveInfinity);
}
if ("-Infinity" == s)
{
return(double.NegativeInfinity);
}
}
// todo: use a common implementation with JavascriptParser
try
{
if (!s.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
{
var start = s[0];
if (start != '+' && start != '-' && start != '.' && !char.IsDigit(start))
{
return(double.NaN);
}
double n = double.Parse(s,
NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign |
NumberStyles.AllowLeadingWhite | NumberStyles.AllowTrailingWhite |
NumberStyles.AllowExponent, CultureInfo.InvariantCulture);
if (s.StartsWith("-") && n == 0)
{
return(-0.0);
}
return(n);
}
int i = int.Parse(s.Substring(2), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
return(i);
}
// TODO
// catch (OverflowException)
// {
// return s.StartsWith("-") ? double.NegativeInfinity : double.PositiveInfinity;
// }
catch
{
return(double.NaN);
}
}