public static IParser Integer(
bool allowLeadingZero = false,
bool allowNegative = true,
string name = "Integer")
{
var parser = allowLeadingZero
? ParserBuilder.OneOrMore(ParserBuilder.Class("0-9"))
: ParserBuilder.Choice(
ParserBuilder.T("0"),
ParserBuilder.Sequence(
ParserBuilder.Class("1-9"),
ParserBuilder.ZeroOrMore(ParserBuilder.Class("0-9"))
)
);
if (allowNegative)
{
parser = ParserBuilder.Sequence(
ParserBuilder.Optional(ParserBuilder.T("-")),
parser
);
}
return(AddName(parser, name));
}
public static IParser Decimal(
bool allowLeadingZero = false,
bool allowNegative = true,
bool allowIntegerOnly = true,
bool allowEmptyDecimalDigits = false, // Ex: 12. instead of 12.0
string name = "Decimal")
{
var intPart = Integer(
allowLeadingZero,
allowNegative,
null);
var decimalDigitsPart = allowEmptyDecimalDigits
? ParserBuilder.ZeroOrMore(ParserBuilder.Class("0-9"))
: ParserBuilder.OneOrMore(ParserBuilder.Class("0-9"));
var decimalPart = ParserBuilder.Sequence(
ParserBuilder.T("."),
decimalDigitsPart);
if (allowIntegerOnly)
{
decimalPart = ParserBuilder.Optional(decimalPart);
}
var parser = ParserBuilder.Sequence(
intPart,
decimalPart);
return(AddName(parser, name));
}
public static IParser Identifier(
string name = "Identifier")
{
var parser = ParserBuilder.Sequence(
ParserBuilder.Choice(
ParserBuilder.T('_'),
ParserBuilder.Letter
),
ParserBuilder.ZeroOrMore(ParserBuilder.Choice(
ParserBuilder.T('_'),
ParserBuilder.LetterOrDigit
))
);
return(AddName(parser, name));
}