public static void Consume_Number(DataConsumer <char> Stream, out ReadOnlyMemory <char> /* */ outResult, out object outNumber, out ENumericTokenType outType)
{/* Docs: https://www.w3.org/TR/css-syntax-3/#consume-number */
if (Stream is null)
{
throw new ArgumentNullException(nameof(Stream));
}
Contract.EndContractBlock();
outType = ENumericTokenType.Integer;
bool IsPositive = true;
bool Exponent_IsPositive = true;
bool Decimal = false;
bool HasExponent = false;
int Start = Stream.Position;
if (Stream.Next == CHAR_HYPHEN_MINUS)
{
IsPositive = false;
Stream.Consume();
}
else if (Stream.Next == CHAR_PLUS_SIGN)
{
Stream.Consume();
}
if (!Stream.Consume_While(Is_Ascii_Digit, out ReadOnlySpan <char> Integer))
{
throw new CssParserException(ParserErrors.PARSING_FAILED);
}
if (Stream.Next == CHAR_FULL_STOP)
{
outType = ENumericTokenType.Number;
Decimal = true;
Stream.Consume();
}
if (!Stream.Consume_While(Is_Ascii_Digit, out ReadOnlySpan <char> Fraction) && Decimal)
{
throw new CssParserException(ParserErrors.PARSING_FAILED);
}
if (Stream.Next == CHAR_E_UPPER || Stream.Next == CHAR_E_LOWER)
{
HasExponent = true;
outType = ENumericTokenType.Number;
Stream.Consume();
}
if (Stream.Next == CHAR_HYPHEN_MINUS)
{
Exponent_IsPositive = false;
Stream.Consume();
}
else if (Stream.Next == CHAR_PLUS_SIGN)
{
Stream.Consume();
}
if (!Stream.Consume_While(Is_Ascii_Digit, out ReadOnlySpan <char> Exponent) && HasExponent)
{
throw new CssParserException(ParserErrors.PARSING_FAILED);
}
int len = Stream.Position - Start;
outResult = Stream.AsMemory().Slice(Start, len);
//return S * (I + (F * Math.Pow(10, -D))) * Math.Pow(10, T*E);
if (Decimal)
{
outNumber = ParsingCommon.ToDecimal(IsPositive ? 1 : -1, Integer, Fraction, Exponent_IsPositive ? 1 : -1, Exponent);
}
else
{
outNumber = ParsingCommon.ToInteger(IsPositive ? 1 : -1, Integer, Exponent_IsPositive ? 1 : -1, Exponent);
}
}
public static double Convert_String_To_Number(DataConsumer <char> Stream)
{/* Docs: https://www.w3.org/TR/css-syntax-3/#convert-string-to-number */
if (Stream is null)
{
throw new ArgumentNullException(nameof(Stream));
}
Contract.EndContractBlock();
//double S = 1;//Sign
//double T = 1;// Exponent Sign
//double I = 0;// Integer
//double F = 0;// Fraction
//double D = 0;// Number of fraction digits
//double E = 0;// Exponent
bool Sign = true;
bool Exponent_Sign = true;
bool Decimal = false;
//bool Exponent_Indicator = false;
if (Stream.Next == CHAR_HYPHEN_MINUS)
{
//S = -1;
Sign = false;
Stream.Consume();
}
else if (Stream.Next == CHAR_PLUS_SIGN)
{
Stream.Consume();
}
if (!Stream.Consume_While(Is_Ascii_Digit, out ReadOnlySpan <char> Integer))
{
throw new CssParserException(ParserErrors.PARSING_FAILED);
}
if (Stream.Next == CHAR_FULL_STOP)
{
Decimal = true;
Stream.Consume();
}
if (!Stream.Consume_While(Is_Ascii_Digit, out ReadOnlySpan <char> Fraction))
{
throw new CssParserException(ParserErrors.PARSING_FAILED);
}
if (Stream.Next == CHAR_E_UPPER || Stream.Next == CHAR_E_LOWER)
{
//Exponent_Indicator = true;
Stream.Consume();
}
if (Stream.Next == CHAR_HYPHEN_MINUS)
{
//T = -1;
Exponent_Sign = false;
Stream.Consume();
}
else if (Stream.Next == CHAR_PLUS_SIGN)
{
Stream.Consume();
}
if (!Stream.Consume_While(Is_Ascii_Digit, out ReadOnlySpan <char> Exponent))
{
throw new CssParserException(ParserErrors.PARSING_FAILED);
}
//return S * (I + (F * Math.Pow(10, -D))) * Math.Pow(10, T*E);
if (Decimal)
{
return(ParsingCommon.ToDecimal(Sign ? 1 : -1, Integer, Fraction, Exponent_Sign ? 1 : -1, Exponent));
}
else
{
return(ParsingCommon.ToInteger(Sign ? 1 : -1, Integer, Exponent_Sign ? 1 : -1, Exponent));
}
}