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//
// System.Double.cs
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Bob Smith (bob@thestuff.net)
//
// (C) Ximian, Inc. http://www.ximian.com
// (C) Bob Smith. http://www.thestuff.net
//
using System.Globalization;
using System.Runtime.CompilerServices;
namespace System {
[Serializable]
public struct Double : IComparable, IFormattable, IConvertible {
public const double Epsilon = 4.9406564584124650e-324;
public const double MaxValue = 1.7976931348623157e308;
public const double MinValue = -1.7976931348623157e308;
public const double NaN = 0.0d / 0.0d;
public const double NegativeInfinity = -1.0d / 0.0d;
public const double PositiveInfinity = 1.0d / 0.0d;
internal double value;
public int CompareTo (object v)
{
if (v == null)
return 1;
if (!(v is System.Double))
throw new ArgumentException (Locale.GetText ("Value is not a System.Double"));
double dv = (double)v;
if (IsPositiveInfinity(value) && IsPositiveInfinity(dv))
return 0;
if (IsNegativeInfinity(value) && IsNegativeInfinity(dv))
return 0;
if (IsNaN(dv))
if (IsNaN(value))
return 0;
else
return 1;
if (IsNaN(value))
if (IsNaN(dv))
return 0;
else
return -1;
if (value > dv) return 1;
else if (value < dv) return -1;
else return 0;
}
public override bool Equals (object o)
{
if (!(o is System.Double))
return false;
if (IsNaN ((double)o)) {
if (IsNaN(value))
return true;
else
return false;
}
return ((double) o) == value;
}
public override int GetHashCode ()
{
return (int) value;
}
public static bool IsInfinity (double d)
{
return (d == PositiveInfinity || d == NegativeInfinity);
}
public static bool IsNaN (double d)
{
return (d != d);
}
public static bool IsNegativeInfinity (double d)
{
return (d < 0.0d && (d == NegativeInfinity || d == PositiveInfinity));
}
public static bool IsPositiveInfinity (double d)
{
return (d > 0.0d && (d == NegativeInfinity || d == PositiveInfinity));
}
public static double Parse (string s)
{
return Parse (s, (NumberStyles.Float | NumberStyles.AllowThousands), null);
}
public static double Parse (string s, IFormatProvider fp)
{
return Parse (s, (NumberStyles.Float | NumberStyles.AllowThousands), fp);
}
public static double Parse (string s, NumberStyles style)
{
return Parse (s, style, null);
}
// We're intentionally using constants here to avoid some bigger headaches in mcs.
// This struct must be compiled before System.Enum so we can't use enums here.
private const int State_AllowSign = 1;
private const int State_Digits = 2;
private const int State_Decimal = 3;
private const int State_ExponentSign = 4;
private const int State_Exponent = 5;
private const int State_ConsumeWhiteSpace = 6;
[MonoTODO("check if digits are group in correct numbers between the group separators")]
public static double Parse (string s, NumberStyles style, IFormatProvider provider)
{
if (s == null) throw new ArgumentNullException();
if (style > NumberStyles.Any)
{
throw new ArgumentException();
}
NumberFormatInfo format = NumberFormatInfo.GetInstance(provider);
if (format == null) throw new Exception("How did this happen?");
if (s == format.NaNSymbol) return Double.NaN;
if (s == format.PositiveInfinitySymbol) return Double.PositiveInfinity;
if (s == format.NegativeInfinitySymbol) return Double.NegativeInfinity;
//
// validate and prepare string for C
//
int len = s.Length;
byte [] b = new byte [len + 1];
int didx = 0;
int sidx = 0;
char c;
if ((style & NumberStyles.AllowLeadingWhite) != 0){
while (sidx < len && Char.IsWhiteSpace (c = s [sidx]))
sidx++;
if (sidx == len)
throw new FormatException();
}
bool allow_trailing_white = ((style & NumberStyles.AllowTrailingWhite) != 0);
//
// Machine state
//
int state = State_AllowSign;
//
// Setup
//
string decimal_separator = null;
string group_separator = null;
int decimal_separator_len = 0;
int group_separator_len = 0;
if ((style & NumberStyles.AllowDecimalPoint) != 0){
decimal_separator = format.NumberDecimalSeparator;
decimal_separator_len = decimal_separator.Length;
}
if ((style & NumberStyles.AllowThousands) != 0){
group_separator = format.NumberGroupSeparator;
group_separator_len = group_separator.Length;
}
string positive = format.PositiveSign;
string negative = format.NegativeSign;
for (; sidx < len; sidx++){
c = s [sidx];
switch (state){
case State_AllowSign:
if ((style & NumberStyles.AllowLeadingSign) != 0){
if (c == positive [0] &&
s.Substring (sidx, positive.Length) == positive){
state = State_Digits;
sidx += positive.Length-1;
continue;
}
if (c == negative [0] &&
s.Substring (sidx, negative.Length) == negative){
state = State_Digits;
b [didx++] = (byte) '-';
sidx += negative.Length-1;
continue;
}
}
state = State_Digits;
goto case State_Digits;
case State_Digits:
if (Char.IsDigit (c)){
b [didx++] = (byte) c;
break;
}
if (c == 'e' || c == 'E')
goto case State_Decimal;
if (decimal_separator != null &&
decimal_separator [0] == c){
if (s.Substring (sidx, decimal_separator_len) ==
decimal_separator){
b [didx++] = (byte) '.';
sidx += decimal_separator_len-1;
state = State_Decimal;
break;
}
}
if (group_separator != null &&
group_separator [0] == c){
if (s.Substring (sidx, group_separator_len) ==
group_separator){
sidx += group_separator_len-1;
state = State_Digits;
break;
}
}
if (Char.IsWhiteSpace (c))
goto case State_ConsumeWhiteSpace;
throw new FormatException ("Unknown char: " + c);
case State_Decimal:
if (Char.IsDigit (c)){
b [didx++] = (byte) c;
break;
}
if (c == 'e' || c == 'E'){
if ((style & NumberStyles.AllowExponent) == 0)
throw new FormatException ("Unknown char: " + c);
b [didx++] = (byte) c;
state = State_ExponentSign;
break;
}
if (Char.IsWhiteSpace (c))
goto case State_ConsumeWhiteSpace;
throw new FormatException ("Unknown char: " + c);
case State_ExponentSign:
if (Char.IsDigit (c)){
state = State_Exponent;
goto case State_Exponent;
}
if (c == positive [0] &&
s.Substring (sidx, positive.Length) == positive){
state = State_Digits;
sidx += positive.Length-1;
continue;
}
if (c == negative [0] &&
s.Substring (sidx, negative.Length) == negative){
state = State_Digits;
b [didx++] = (byte) '-';
sidx += negative.Length-1;
continue;
}
if (Char.IsWhiteSpace (c))
goto case State_ConsumeWhiteSpace;
throw new FormatException ("Unknown char: " + c);
case State_Exponent:
if (Char.IsDigit (c)){
b [didx++] = (byte) c;
break;
}
if (Char.IsWhiteSpace (c))
goto case State_ConsumeWhiteSpace;
throw new FormatException ("Unknown char: " + c);
case State_ConsumeWhiteSpace:
if (allow_trailing_white && Char.IsWhiteSpace (c))
break;
throw new FormatException ("Unknown char");
}
}
b [didx] = 0;
unsafe {
fixed (byte *p = &b [0]){
double retVal = ParseImpl (p);
if (IsPositiveInfinity(retVal) || IsNegativeInfinity(retVal))
throw new OverflowException();
return retVal;
}
}
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
unsafe private static extern double ParseImpl (byte *byte_ptr);
public static bool TryParse (string s,
NumberStyles style,
IFormatProvider provider,
ref double result)
{
try {
result = Parse (s, style, provider);
return true;
} catch {
return false;
}
}
public override string ToString ()
{
return ToString (null, null);
}
public string ToString (IFormatProvider fp)
{
return ToString (null, fp);
}
public string ToString (string format)
{
return ToString (format, null);
}
[MonoTODO]
public string ToString (string format, IFormatProvider fp)
{
// FIXME: Need to pass format and provider info to this call too.
if (format == "X")
throw new FormatException();
return ToStringImpl(value);
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern string ToStringImpl (double value);
// =========== IConvertible Methods =========== //
public TypeCode GetTypeCode ()
{
return TypeCode.Double;
}
object IConvertible.ToType (Type conversionType, IFormatProvider provider)
{
return System.Convert.ToType(value, conversionType, provider);
}
bool IConvertible.ToBoolean (IFormatProvider provider)
{
return System.Convert.ToBoolean(value);
}
byte IConvertible.ToByte (IFormatProvider provider)
{
return System.Convert.ToByte(value);
}
char IConvertible.ToChar (IFormatProvider provider)
{
throw new InvalidCastException();
}
[CLSCompliant(false)]
DateTime IConvertible.ToDateTime (IFormatProvider provider)
{
throw new InvalidCastException();
}
decimal IConvertible.ToDecimal (IFormatProvider provider)
{
return System.Convert.ToDecimal(value);
}
double IConvertible.ToDouble (IFormatProvider provider)
{
return System.Convert.ToDouble(value);
}
short IConvertible.ToInt16 (IFormatProvider provider)
{
return System.Convert.ToInt16(value);
}
int IConvertible.ToInt32 (IFormatProvider provider)
{
return System.Convert.ToInt32(value);
}
long IConvertible.ToInt64 (IFormatProvider provider)
{
return System.Convert.ToInt64(value);
}
[CLSCompliant(false)]
sbyte IConvertible.ToSByte (IFormatProvider provider)
{
return System.Convert.ToSByte(value);
}
float IConvertible.ToSingle (IFormatProvider provider)
{
return System.Convert.ToSingle(value);
}
/*
string IConvertible.ToString (IFormatProvider provider)
{
return ToString(provider);
}
*/
[CLSCompliant(false)]
ushort IConvertible.ToUInt16 (IFormatProvider provider)
{
return System.Convert.ToUInt16(value);
}
[CLSCompliant(false)]
uint IConvertible.ToUInt32 (IFormatProvider provider)
{
return System.Convert.ToUInt32(value);
}
[CLSCompliant(false)]
ulong IConvertible.ToUInt64 (IFormatProvider provider)
{
return System.Convert.ToUInt64(value);
}
}
}
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