base-4.7.0.2: Basic libraries

Copyright(c) The University of Glasgow 2002
LicenseBSD-style (see the file libraries/base/LICENSE)
Maintainerlibraries@haskell.org
Stabilityprovisional
Portabilitynon-portable (uses Text.ParserCombinators.ReadP)
Safe HaskellTrustworthy
LanguageHaskell2010

Text.Read.Lex

Description

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

Synopsis

Documentation

data Lexeme Source

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

data Number Source

Since: 4.7.0.0

Instances

numberToInteger :: Number -> Maybe Integer Source

Since: 4.5.1.0

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

Since: 4.7.0.0

numberToRational :: Number -> Rational Source

Since: 4.6.0.0

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

Since: 4.5.1.0

lex :: ReadP Lexeme Source

expect :: Lexeme -> ReadP () Source

Since: 4.7.0.0

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 a Source

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

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

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