/// <summary>Converts this value to a <c>decimal</c> under the Common
/// Language Infrastructure (usually a.NET Framework decimal).
/// Currently, converts this value to the precision and range of a.NET
/// Framework decimal.</summary>
/// <returns>A <c>decimal</c> under the Common Language Infrastructure
/// (usually a.NET Framework decimal).</returns>
public decimal ToDecimal()
{
ERational extendedNumber = this;
if (extendedNumber.IsInfinity() || extendedNumber.IsNaN())
{
throw new OverflowException("This object's value is out of range");
}
try {
EDecimal newDecimal = EDecimal.FromEInteger(extendedNumber.Numerator)
.Divide(
EDecimal.FromEInteger(extendedNumber.Denominator),
EContext.CliDecimal.WithTraps(EContext.FlagOverflow));
return((decimal)newDecimal);
} catch (ETrapException ex) {
throw new OverflowException("This object's value is out of range", ex);
}
}
public static ERational FromString(
byte[] chars,
int offset,
int length,
bool throwException)
{
int tmpoffset = offset;
if (chars == null)
{
if (!throwException)
{
return(null);
}
else
{
throw new ArgumentNullException(nameof(chars));
}
}
if (tmpoffset < 0)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException("offset(" + tmpoffset + ") is" +
"\u0020less" + "\u0020than " + "0");
}
}
if (tmpoffset > chars.Length)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException("offset(" + tmpoffset + ") is" +
"\u0020more" + "\u0020than " + chars.Length);
}
}
if (length < 0)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException("length(" + length + ") is less than " + "0");
}
}
if (length > chars.Length)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException("length(" + length + ") is more than " +
chars.Length);
}
}
if (chars.Length - tmpoffset < length)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException("chars's length minus " +
tmpoffset + "(" + (chars.Length - tmpoffset) + ") is less than " + length);
}
}
if (length == 0)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
var negative = false;
int endStr = tmpoffset + length;
if (chars[tmpoffset] == '+' || chars[tmpoffset] == '-')
{
negative = chars[tmpoffset] == '-';
++tmpoffset;
}
var numerInt = 0;
EInteger numer = null;
var haveDigits = false;
var haveDenominator = false;
var ndenomInt = 0;
EInteger ndenom = null;
int i = tmpoffset;
if (i + 8 == endStr)
{
if ((chars[i] == 'I' || chars[i] == 'i') &&
(chars[i + 1] == 'N' || chars[i + 1] == 'n') &&
(chars[i + 2] == 'F' || chars[i + 2] == 'f') &&
(chars[i + 3] == 'I' || chars[i + 3] == 'i') && (chars[i + 4] ==
'N' ||
chars[i + 4] == 'n') && (chars[i + 5] == 'I' || chars[i + 5] ==
'i') &&
(chars[i + 6] == 'T' || chars[i + 6] == 't') && (chars[i + 7] ==
'Y' || chars[i + 7] == 'y'))
{
return(negative ? ERational.NegativeInfinity :
ERational.PositiveInfinity);
}
}
if (i + 3 == endStr)
{
if ((chars[i] == 'I' || chars[i] == 'i') &&
(chars[i + 1] == 'N' || chars[i + 1] == 'n') && (chars[i + 2] ==
'F' || chars[i + 2] == 'f'))
{
return(negative ? ERational.NegativeInfinity :
ERational.PositiveInfinity);
}
}
var numerStart = 0;
if (i + 3 <= endStr)
{
// Quiet NaN
if ((chars[i] == 'N' || chars[i] == 'n') && (chars[i + 1] == 'A' ||
chars[i +
1] == 'a') && (chars[i + 2] == 'N' || chars[i + 2] == 'n'))
{
if (i + 3 == endStr)
{
return((!negative) ? ERational.NaN : ERational.NaN.Negate());
}
i += 3;
numerStart = i;
for (; i < endStr; ++i)
{
if (chars[i] >= '0' && chars[i] <= '9')
{
var thisdigit = (int)(chars[i] - '0');
if (numerInt <= MaxSafeInt)
{
numerInt *= 10;
numerInt += thisdigit;
}
}
else
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
}
if (numerInt > MaxSafeInt)
{
numer = EInteger.FromSubstring(chars, numerStart, endStr);
return(ERational.CreateNaN(numer, false, negative));
}
else
{
return(ERational.CreateNaN(
EInteger.FromInt32(numerInt),
false,
negative));
}
}
}
if (i + 4 <= endStr)
{
// Signaling NaN
if ((chars[i] == 'S' || chars[i] == 's') && (chars[i + 1] == 'N' ||
chars[i +
1] == 'n') && (chars[i + 2] == 'A' || chars[i + 2] == 'a') &&
(chars[i + 3] == 'N' || chars[i + 3] == 'n'))
{
if (i + 4 == endStr)
{
return((!negative) ? ERational.SignalingNaN :
ERational.SignalingNaN.Negate());
}
i += 4;
numerStart = i;
for (; i < endStr; ++i)
{
if (chars[i] >= '0' && chars[i] <= '9')
{
var thisdigit = (int)(chars[i] - '0');
haveDigits = haveDigits || thisdigit != 0;
if (numerInt <= MaxSafeInt)
{
numerInt *= 10;
numerInt += thisdigit;
}
}
else
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
}
int flags3 = (negative ? BigNumberFlags.FlagNegative : 0) |
BigNumberFlags.FlagSignalingNaN;
if (numerInt > MaxSafeInt)
{
numer = EInteger.FromSubstring(chars, numerStart, endStr);
return(ERational.CreateNaN(numer, true, negative));
}
else
{
return(ERational.CreateNaN(
EInteger.FromInt32(numerInt),
true,
negative));
}
}
}
// Ordinary number
numerStart = i;
int numerEnd = i;
for (; i < endStr; ++i)
{
if (chars[i] >= '0' && chars[i] <= '9')
{
var thisdigit = (int)(chars[i] - '0');
numerEnd = i + 1;
if (numerInt <= MaxSafeInt)
{
numerInt *= 10;
numerInt += thisdigit;
}
haveDigits = true;
}
else if (chars[i] == '/')
{
haveDenominator = true;
++i;
break;
}
else
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
}
if (!haveDigits)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
if (numerInt > MaxSafeInt)
{
numer = EInteger.FromSubstring(chars, numerStart, numerEnd);
}
if (haveDenominator)
{
EInteger denom = null;
var denomInt = 0;
tmpoffset = 1;
haveDigits = false;
if (i == endStr)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
numerStart = i;
for (; i < endStr; ++i)
{
if (chars[i] >= '0' && chars[i] <= '9')
{
haveDigits = true;
var thisdigit = (int)(chars[i] - '0');
numerEnd = i + 1;
if (denomInt <= MaxSafeInt)
{
denomInt *= 10;
denomInt += thisdigit;
}
}
else
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
}
if (!haveDigits)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
if (denomInt > MaxSafeInt)
{
denom = EInteger.FromSubstring(chars, numerStart, numerEnd);
}
if (denom == null)
{
ndenomInt = denomInt;
}
else
{
ndenom = denom;
}
}
else
{
ndenomInt = 1;
}
if (i != endStr)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
if (ndenom == null ? (ndenomInt == 0) : ndenom.IsZero)
{
if (!throwException)
{
return(null);
}
else
{
throw new FormatException();
}
}
ERational erat = ERational.Create(
numer == null ? (EInteger)numerInt : numer,
ndenom == null ? (EInteger)ndenomInt : ndenom);
return(negative ? erat.Negate() : erat);
}