private static bool ParseExactLiteral(ref NumberSpanTokenizer tokenizer, StringBuilder enquotedString)
{
for (int i = 0; i < enquotedString.Length; i++)
if (enquotedString[i] != tokenizer.NextChar)
return false;
return true;
}
private static bool ParseExactDigits(ref NumberSpanTokenizer tokenizer, int minDigitLength, out int result)
{
result = 0;
int zeroes = 0;
int maxDigitLength = (minDigitLength == 1 ? 2 : minDigitLength);
return ParseExactDigits(ref tokenizer, minDigitLength, maxDigitLength, out zeroes, out result);
}
private static bool ParseExactDigits(ref NumberSpanTokenizer tokenizer, int minDigitLength, int maxDigitLength, out int zeroes, out int result)
{
result = 0;
zeroes = 0;
int num = 0;
while (num < maxDigitLength)
{
char nextChar = tokenizer.NextChar;
if (nextChar < '0' || nextChar > '9')
{
tokenizer.BackOne();
break;
}
result = (result * 10) + (nextChar - '0');
if (result == 0)
zeroes++;
num++;
}
return (num >= minDigitLength);
}
private static bool TryParseNumberSpan(string input, NumberSpanStandardStyles style, IFormatProvider formatProvider, ref NumberSpanResult result)
{
if (input == null)
{
result.SetFailure(ParseFailureKind.ArgumentNull, "ArgumentNull_String", null, "input");
return false;
}
input = input.Trim();
if (input == string.Empty)
{
result.SetFailure(ParseFailureKind.Format, "Format_BadNumberSpan");
return false;
}
var tokenizer = new NumberSpanTokenizer();
tokenizer.Init(input);
var raw = new NumberSpanRawInfo();
raw.Init(); //DateTimeFormatInfo.GetInstance(formatProvider));
for (var token = tokenizer.GetNextToken(); token._ttt != TTT.End; token = tokenizer.GetNextToken())
if (!raw.ProcessToken(ref token, ref result))
{
result.SetFailure(ParseFailureKind.Format, "Format_BadNumberSpan");
return false;
}
if (!tokenizer.EOL)
{
result.SetFailure(ParseFailureKind.Format, "Format_BadNumberSpan");
return false;
}
if (!ProcessTerminalState(ref raw, style, ref result))
{
result.SetFailure(ParseFailureKind.Format, "Format_BadNumberSpan");
return false;
}
return true;
}
