private static bool TryReadHatPower(string text, ref int pos, out int power)
{
if (text[pos] != '^')
{
// leaving this even if it is a try method. Getting here means something should have been checked before
throw new InvalidOperationException("Check that there is a hat power to read before calling this");
}
pos++;
WhiteSpaceReader.TryRead(text, ref pos);
var ps = OperatorReader.TryReadSign(text, ref pos);
if (ps == Sign.None)
{
ps = Sign.Positive;
}
if (OperatorReader.TryReadSign(text, ref pos) != Sign.None)
{
// not allowing a^--2 as it is most likely a typo
power = 0;
return(false);
}
WhiteSpaceReader.TryRead(text, ref pos);
if (IntReader.TryReadInt32(text, ref pos, out power))
{
power *= (int)ps;
return(true);
}
power = 0;
return(false);
}
private static bool TryReadSuperScriptPower(string text, ref int pos, out int power)
{
if (!text[pos].IsSuperscriptDigitOrSign())
{
power = 0;
return(false);
}
var sign = TryReadSuperScriptSign(text, ref pos);
if (sign == Sign.None)
{
sign = Sign.Positive;
}
if (TryReadSuperScriptSign(text, ref pos) != Sign.None)
{
// not allowing a⁻⁻² as it is most likely a typo
power = 0;
return(false);
}
WhiteSpaceReader.TryRead(text, ref pos);
if (TryReadSuperScriptInt(text, ref pos, out power))
{
power *= (int)sign;
return(true);
}
power = 0;
return(false);
}
internal static TQuantity Parse <TUnit, TQuantity>(string text, Func <double, TUnit, TQuantity> creator, NumberStyles style, IFormatProvider provider)
where TQuantity : IQuantity <TUnit>
where TUnit : struct, IUnit, IEquatable <TUnit>
{
var pos = 0;
_ = WhiteSpaceReader.TryRead(text, ref pos);
if (!DoubleReader.TryRead(text, ref pos, style, provider, out var d))
{
throw new FormatException("Could not parse the scalar value from: " + text);
}
_ = WhiteSpaceReader.TryRead(text, ref pos);
if (!UnitParser <TUnit> .TryParse(text, ref pos, out var unit))
{
throw new FormatException("Could not parse the unit value from: " + text);
}
_ = WhiteSpaceReader.TryRead(text, ref pos);
if (pos != text.Length)
{
throw new FormatException("Could not parse the unit value from: " + text);
}
return(creator(d, unit));
}
internal static bool TryParse(string text, ref int pos, out TUnit result)
{
var start = pos;
if (UnitFormatCache <TUnit> .Cache.TryGetUnitForSymbol(text, ref pos, out result))
{
return(true);
}
if (SymbolAndPowerReader.TryRead(text, ref pos, out IReadOnlyList <SymbolAndPower> symbolsAndPowers))
{
var symbol = text.Substring(start, pos - start);
WhiteSpaceReader.TryRead(text, ref pos, out string _);
if (!IsEndOfSymbol(text, pos))
{
result = Unit <TUnit> .Default;
return(false);
}
if (UnitFormatCache <TUnit> .Cache.TryGetUnitForParts(symbolsAndPowers, out result))
{
UnitFormatCache <TUnit> .Cache.Add(symbol, symbolsAndPowers);
UnitFormatCache <TUnit> .Cache.Add(symbol, result);
return(true);
}
}
pos = start;
result = Unit <TUnit> .Default;
return(false);
}
internal static bool TryParse <TUnit, TQuantity>(string text, Func <double, TUnit, TQuantity> creator, NumberStyles style, IFormatProvider provider, out TQuantity value)
where TQuantity : struct, IQuantity <TUnit>
where TUnit : struct, IUnit, IEquatable <TUnit>
{
var pos = 0;
_ = WhiteSpaceReader.TryRead(text, ref pos);
if (!DoubleReader.TryRead(text, ref pos, style, provider, out var d))
{
value = default;
return(false);
}
_ = WhiteSpaceReader.TryRead(text, ref pos);
if (!UnitParser <TUnit> .TryParse(text, ref pos, out var unit))
{
value = default;
return(false);
}
_ = WhiteSpaceReader.TryRead(text, ref pos);
if (pos != text.Length)
{
value = default;
return(false);
}
value = creator(d, unit);
return(true);
}
internal static bool TryParse(string text, out TUnit value)
{
var pos = 0;
WhiteSpaceReader.TryRead(text, ref pos);
return(TryParse(text, ref pos, out value) &&
WhiteSpaceReader.IsRestWhiteSpace(text, pos));
}
internal static PaddedFormat GetOrCreate(string format, ref int pos, out TUnit unit)
{
var start = pos;
WhiteSpaceReader.TryRead(format, ref pos, out string prePadding);
if (format == null ||
pos == format.Length)
{
pos = start;
unit = Unit <TUnit> .Default;
return(PaddedFormat.CreateUnknown(prePadding, null));
}
if (Cache.TryGetUnitForSymbol(format, ref pos, out string symbol, out unit))
{
if (WhiteSpaceReader.IsRestWhiteSpace(format, pos))
{
WhiteSpaceReader.TryRead(format, ref pos, out string postPadding);
return(new PaddedFormat(prePadding, symbol, postPadding));
}
pos -= symbol.Length;
}
if (SymbolAndPowerReader.TryRead(format, ref pos, out IReadOnlyList <SymbolAndPower> symbolsAndPowers))
{
symbol = format.Substring(start, pos - start);
WhiteSpaceReader.TryRead(format, ref pos, out string postPadding);
if (!WhiteSpaceReader.IsRestWhiteSpace(format, pos))
{
pos = start;
unit = Unit <TUnit> .Default;
return(PaddedFormat.CreateUnknown(prePadding, format.Substring(start)));
}
if (Cache.TryGetUnitForParts(symbolsAndPowers, out unit))
{
Cache.Add(symbol, symbolsAndPowers);
Cache.Add(symbol, unit);
}
else
{
pos = start;
unit = Unit <TUnit> .Default;
return(PaddedFormat.CreateUnknown(prePadding, format.Substring(start)));
}
return(new PaddedFormat(prePadding, symbol, postPadding));
}
pos = start;
return(PaddedFormat.CreateUnknown(prePadding, format));
}
internal static PaddedFormat GetOrCreate(string format, ref int pos)
{
string prePadding;
WhiteSpaceReader.TryRead(format, ref pos, out prePadding);
string valueFormat;
if (DoubleFormatReader.TryRead(format, ref pos, out valueFormat))
{
string postPadding;
WhiteSpaceReader.TryRead(format, ref pos, out postPadding);
return(new PaddedFormat(prePadding, valueFormat, postPadding));
}
return(PaddedFormat.CreateUnknown(prePadding, format));
}
internal static bool TryRead(string text, ref int pos, out SymbolAndPower result)
{
if (pos == text.Length)
{
result = default(SymbolAndPower);
return(false);
}
var start = pos;
while (text.Length > pos && IsSymbol(text[pos]))
{
pos++;
}
if (pos == start)
{
result = default(SymbolAndPower);
return(false);
}
var symbol = text.Substring(start, pos - start);
WhiteSpaceReader.TryRead(text, ref pos);
int power;
if (!PowerReader.TryRead(text, ref pos, out power))
{
pos = start;
result = default(SymbolAndPower);
return(false);
}
if (power == 0 || Math.Abs(power) > 5) // 5 > is most likely a typo right?
{
pos = start;
result = default(SymbolAndPower);
return(false);
}
result = new SymbolAndPower(symbol, power);
return(true);
}
internal static bool TryRead(string text, ref int pos, out IReadOnlyList <SymbolAndPower> result)
{
var start = pos;
var sign = Sign.Positive;
List <SymbolAndPower> saps = null;
while (pos < text.Length)
{
WhiteSpaceReader.TryRead(text, ref pos);
if (!TryRead(text, ref pos, out SymbolAndPower sap))
{
pos = start;
result = null;
return(false);
}
if (sap.Power < 0 &&
sign == Sign.Negative)
{
pos = start;
result = null;
return(false);
}
if (sign == Sign.Negative)
{
sap = new SymbolAndPower(sap.Symbol, -1 * sap.Power);
}
if (saps == null)
{
saps = new List <SymbolAndPower>();
}
saps.Add(sap);
var op = OperatorReader.TryReadMultiplyOrDivide(text, ref pos);
if (op != MultiplyOrDivide.None)
{
WhiteSpaceReader.TryRead(text, ref pos);
if (OperatorReader.TryReadMultiplyOrDivide(text, ref pos) != MultiplyOrDivide.None)
{
pos = start;
result = null;
return(false);
}
if (op == MultiplyOrDivide.Division)
{
if (sign == Sign.Negative)
{
pos = start;
result = null;
return(false);
}
sign = Sign.Negative;
}
}
}
if (saps == null || !IsUnique(saps))
{
result = null;
return(false);
}
result = saps;
return(true);
}
internal static bool TryRead(
string text,
ref int pos,
NumberStyles style,
IFormatProvider provider,
out double result)
{
result = 0;
var start = pos;
if (string.IsNullOrEmpty(text))
{
return(false);
}
if (!IsValidFloatingPointStyle(style))
{
return(false);
}
if ((style & NumberStyles.AllowHexSpecifier) != 0)
{
return(false);
}
if ((style & NumberStyles.AllowLeadingWhite) != 0)
{
_ = WhiteSpaceReader.TryRead(text, ref pos);
}
if (char.IsWhiteSpace(text[pos]))
{
return(false);
}
if (TrySkipDoubleDigits(text, ref pos, style, provider))
{
return(TryParseSubString(text, start, ref pos, style, provider, out result));
}
if (provider is null)
{
provider = CultureInfo.CurrentCulture;
}
var format = NumberFormatInfo.GetInstance(provider);
if (Skipper.TrySkip(text, ref pos, format.NaNSymbol))
{
result = double.NaN;
return(true);
}
if (Skipper.TrySkip(text, ref pos, format.PositiveInfinitySymbol))
{
result = double.PositiveInfinity;
return(true);
}
if (Skipper.TrySkip(text, ref pos, format.NegativeInfinitySymbol))
{
result = double.NegativeInfinity;
return(true);
}
pos = start;
return(false);
}
