base-4.6.0.1: Basic libraries

Portability	non-portable (uses Text.ParserCombinators.ReadP)
Stability	provisional
Maintainer	libraries@haskell.org
Safe Haskell	Trustworthy

Text.Read.Lex

Description

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

Synopsis

data Lexeme
- = Char Char
- | String String
- | Punc String
- | Ident String
- | Symbol String
- | Number Number
- | EOF
numberToInteger :: Number -> Maybe Integer
numberToRational :: Number -> Rational
numberToRangedRational :: (Int, Int) -> Number -> Maybe Rational
lex :: ReadP Lexeme
hsLex :: ReadP String
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

Documentation

data Lexeme Source

Haskell lexemes.

Constructors

Character literal

String literal, with escapes interpreted

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

Haskell identifier, e.g. foo, Baz

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

Number Number

Instances

numberToInteger :: Number -> Maybe Integer Source

numberToRational :: Number -> Rational Source

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

lex :: ReadP Lexeme Source

hsLex :: ReadP String Source

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

lexChar :: ReadP Char Source

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

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

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

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