private static string GetStringAndClear(PooledList <char> sb)
{
var str = sb.AsSpan().ToString();
sb.Clear();
return(str);
}
public ParseState(Func <TToken, SourcePos, SourcePos> posCalculator, ITokenStream <TToken> stream)
{
_posCalculator = posCalculator;
_bookmarks = new PooledList <Bookmark>();
_stream = stream;
_consumedCount = 0;
SourcePos = new SourcePos(1, 1);
_bufferChunkSize = stream.ChunkSizeHint;
_buffer = ArrayPool <TToken> .Shared.Rent(_bufferChunkSize);
_currentIndex = 0;
_bufferedCount = 0;
_eof = default;
_unexpected = default;
_errorPos = default;
_message = default;
_expecteds = new PooledList <Expected <TToken> >();
_expectedBookmarks = new PooledList <int>();
Buffer(0);
}
/// <summary>
/// A parser which parses a floating point number without a sign.
/// The resulting <c>double</c> is not checked for overflow.
/// </summary>
/// <returns>A parser which parses a floating point number without a sign.</returns>
public static Parser <char, double> UnsignedReal()
=> Map(
(integerPart, _, decimalPart) => integerPart.HasValue ? integerPart.Value + decimalPart : decimalPart,
UnsignedInt(10).Optional(),
Char('.'),
DigitCharDouble().ChainAtLeastOnceL(
() =>
{
var sb = new PooledList <char>();
sb.Add('.');
return(sb);
},
(sb, c) =>
{ sb.Add(c); return(sb); }
).Select(sb =>
{
ReadOnlySpan <char> csp = sb.AsSpan();
double x = 0.0;
x = Double.Parse(csp.ToString(), System.Globalization.NumberStyles.Float);
sb.Clear();
return(x);
}
)
);