base-4.7.0.0: 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 LexemeSource

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 NumberSource

Since: 4.7.0.0

Instances

numberToInteger :: Number -> Maybe IntegerSource

Since: 4.5.1.0

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

Since: 4.7.0.0

numberToRational :: Number -> RationalSource

Since: 4.6.0.0

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

Since: 4.5.1.0

lex :: ReadP LexemeSource

expect :: Lexeme -> ReadP ()Source

Since: 4.7.0.0

hsLex :: ReadP StringSource

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

lexChar :: ReadP CharSource

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