public static string ToString(XsdDuration value)
{
var result = new StringBuilder();
if (value.Negative)
{
result.Append('-');
}
result.Append('P');
int len = result.Length;
if (value.Years != 0)
{
result.Append(value.Years);
result.Append('Y');
}
if (value.Months != 0)
{
result.Append(value.Months);
result.Append('M');
}
if (value.Days != 0)
{
result.Append(value.Days);
result.Append('D');
}
if (value.Hours != 0 || value.Minutes != 0 ||
value.Seconds != 0 || value.Nanoseconds != 0)
{
result.Append('T');
if (value.Hours != 0)
{
result.Append(value.Hours);
result.Append('H');
}
if (value.Minutes != 0)
{
result.Append(value.Minutes);
result.Append('M');
}
if (value.Nanoseconds != 0)
{
result.Append(value.Seconds);
result.Append('.');
// nanoseconds are 10^-9s so pad up to 9 digits with leading zeroes
// trailing zeroes are superfluous so can be trimmed
// 010000000 = .01
// 000000010 = .000000010
// 100000000 = .1
// 120000000 = .12
// 123456789 = .123456789
string ns = value.Nanoseconds.ToString("000000000").TrimEnd(new char[] { '0' });
result.Append(ns);
result.Append('S');
}
else if (value.Seconds != 0)
{
result.Append(value.Seconds);
result.Append('S');
}
}
if (result.Length == len)
{
result.Append("T0S");
}
return(result.ToString());
}
static ParseResult TryParseInternal(string value, out XsdDuration result)
{
result = new XsdDuration();
if (value == null)
{
return(ParseResult.Empty);
}
// skip leading white space
int pos = 0;
for (; pos < value.Length && IsWhite(value[pos]); ++pos)
{
}
// ignore trailing white space
int length = value.Length;
for (; length > 0 && IsWhite(value[length - 1]); --length)
{
}
// check for an empty string
if (pos >= length)
{
return(ParseResult.Empty);
}
// handle negative durations
if (value[pos] == '-')
{
result.Negative = true;
++pos;
}
// P must be present
if (pos >= length || value[pos] != 'P')
{
return(ParseResult.MissingP);
}
++pos;
// duration might be time only
bool seenTime = false;
if (pos < length && value[pos] == 'T')
{
seenTime = true;
++pos;
}
int?num = null;
Func <ParseResult> getNumber = () => ParseNumber(value, ref pos, out num);
// get the first component
ParseResult parseResult = getNumber();
if (parseResult != ParseResult.Ok)
{
return(parseResult);
}
Func <ParseResult> nextComponent = () =>
{
++pos;
if (pos < length)
{
if (value[pos] == 'T')
{
if (seenTime)
{
return(ParseResult.DuplicateTimeSeparator);
}
seenTime = true;
++pos;
}
return(getNumber());
}
else
{
num = null;
}
return(ParseResult.Ok);
};
if (!seenTime)
{
if (pos < length && value[pos] == 'Y')
{
result.Years = num.Value;
if ((parseResult = nextComponent()) != ParseResult.Ok)
{
return(parseResult);
}
}
if (!seenTime && (pos < length && value[pos] == 'M'))
{
result.Months = num.Value;
if ((parseResult = nextComponent()) != ParseResult.Ok)
{
return(parseResult);
}
}
if (!seenTime && (pos < length && value[pos] == 'D'))
{
result.Days = num.Value;
if ((parseResult = nextComponent()) != ParseResult.Ok)
{
return(parseResult);
}
}
if (!seenTime && num.HasValue)
{
return(ParseResult.MissingComponent);
}
}
if (seenTime)
{
if (pos < length && value[pos] == 'H')
{
result.Hours = num.Value;
if ((parseResult = nextComponent()) != ParseResult.Ok)
{
return(parseResult);
}
}
if (pos < length && value[pos] == 'M')
{
result.Minutes = num.Value;
if ((parseResult = nextComponent()) != ParseResult.Ok)
{
return(parseResult);
}
}
if (pos < length && value[pos] == '.')
{
result.Seconds = num.Value;
++pos;
int fraction = 0;
int numDigits = 0;
while (pos < length && IsDigit(value[pos]))
{
num = value[pos++] - '0';
if (fraction <= (Int32.MaxValue - num.Value) / 10)
{
fraction = fraction * 10 + num.Value;
++numDigits;
}
}
if (numDigits == 0)
{
return(ParseResult.MissingNumber);
}
// if we've got more than 9 digits then truncate to nanosecond precision
for (; numDigits > 9; --numDigits)
{
fraction /= 10;
}
// less than 9 digits means 10^(9-digits) nanoseconds,
// .1 is 10^8 ns, .01 is 10^7ns, etc
for (; numDigits < 9; ++numDigits)
{
fraction *= 10;
}
result.Nanoseconds = fraction;
// we have to have 'S' after a decimal number
if (pos >= length || value[pos] != 'S')
{
return(ParseResult.MissingComponent);
}
++pos;
num = null;
}
else if (pos < length && value[pos] == 'S')
{
result.Seconds = num.Value;
++pos;
num = null;
}
if (num.HasValue)
{
return(ParseResult.MissingComponent);
}
}
if (pos != length)
{
return(ParseResult.TrailingText);
}
return(ParseResult.Ok);
}
public static bool TryParse(string value, out XsdDuration result)
{
return(TryParseInternal(value, out result) == ParseResult.Ok);
}