Text.Read.Lex

The cut-down Haskell lexer, used by Text.Read

Documentation

data Lexeme

Haskell lexemes.

Constructors

Char Char

Character literal

String String

String literal, with escapes interpreted

Punc String

Punctuation or reserved symbol, e.g. (, ::

Ident String

Haskell identifier, e.g. foo, Baz

Symbol String

Haskell symbol, e.g. >>, :%

Number Number

Since: 4.6.0.0

EOF

Instances

Eq Lexeme

Read Lexeme

Show Lexeme

data Number

Since: 4.7.0.0

Instances

Eq Number

Show Number

numberToInteger :: Number -> Maybe Integer

Since: 4.5.1.0

numberToFixed :: Integer -> Number -> Maybe (Integer, Integer)

Since: 4.7.0.0

numberToRational :: Number -> Rational

Since: 4.6.0.0

numberToRangedRational :: (Int, Int) -> Number -> Maybe Rational

Since: 4.5.1.0

lex :: ReadP Lexeme

expect :: Lexeme -> ReadP ()

Since: 4.7.0.0

hsLex :: ReadP String

Haskell lexer: returns the lexed string, rather than the lexeme

lexChar :: ReadP Char

readIntP :: Num a => a -> (Char -> Bool) -> (Char -> Int) -> ReadP a

readOctP :: (Eq a, Num a) => ReadP a

readDecP :: (Eq a, Num a) => ReadP a

readHexP :: (Eq a, Num a) => ReadP a