Streamly.Internal.Unicode.Char.Parser

To parse a text input, use the decode routines from Streamly.Unicode.Stream module to convert an input byte stream to a Unicode Char stream and then use these parsers on the Char stream.

Documentation

alpha :: MonadCatch m => Parser m Char Char

alphaNum :: MonadCatch m => Parser m Char Char

ascii :: MonadCatch m => Parser m Char Char

asciiLower :: MonadCatch m => Parser m Char Char

asciiUpper :: MonadCatch m => Parser m Char Char

char :: MonadCatch m => Char -> Parser m Char Char

Match a specific character.

decimal :: (MonadCatch m, Integral a) => Parser m Char a

Parse and decode an unsigned integral decimal number.

digit :: MonadCatch m => Parser m Char Char

double :: Parser m Char Double

Parse a Double.

This parser accepts an optional leading sign character, followed by at most one decimal digit. The syntax is similar to that accepted by the read function, with the exception that a trailing '.' is consumed.

Examples

Examples with behaviour identical to read, if you feed an empty continuation to the first result:

IS.parse double (IS.fromList "3")     == 3.0
IS.parse double (IS.fromList "3.1")   == 3.1
IS.parse double (IS.fromList "3e4")   == 30000.0
IS.parse double (IS.fromList "3.1e4") == 31000.0
IS.parse double (IS.fromList "3e")    == 30

Examples with behaviour identical to read:

IS.parse (IS.fromList ".3")    == error "Parse failed"
IS.parse (IS.fromList "e3")    == error "Parse failed"

Example of difference from read:

IS.parse double (IS.fromList "3.foo") == 3.0

This function does not accept string representations of "NaN" or "Infinity".

Unimplemented

hexadecimal :: (MonadCatch m, Integral a, Bits a) => Parser m Char a

Parse and decode an unsigned integral hexadecimal number. The hex digits 'a' through 'f' may be upper or lower case.

Note: This parser does not accept a leading "0x" string.

hexDigit :: MonadCatch m => Parser m Char Char

latin1 :: MonadCatch m => Parser m Char Char

letter :: MonadCatch m => Parser m Char Char

lower :: MonadCatch m => Parser m Char Char

mark :: MonadCatch m => Parser m Char Char

number :: MonadCatch m => Parser m Char Char

octDigit :: MonadCatch m => Parser m Char Char

print :: MonadCatch m => Parser m Char Char

punctuation :: MonadCatch m => Parser m Char Char

separator :: MonadCatch m => Parser m Char Char

signed :: (Num a, MonadCatch m) => Parser m Char a -> Parser m Char a

Allow an optional leading '+' or '-' sign character before any parser.

space :: MonadCatch m => Parser m Char Char

symbol :: MonadCatch m => Parser m Char Char

upper :: MonadCatch m => Parser m Char Char