base-4.5.1.0: Basic libraries

Portabilitynon-portable (uses Text.ParserCombinators.ReadP)
Stabilityprovisional
Maintainerlibraries@haskell.org
Safe HaskellTrustworthy

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. >>, :%

Int Integer

Integer literal

Rat Rational

Floating point literal

EOF 

Instances

data Lexeme' Source

Constructors

Ident' String 
Punc' String 
Symbol' String 
Number Number 

Instances

Eq Lexeme' 
Show Lexeme' 

numberToInteger :: Number -> Maybe IntegerSource

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

lex :: ReadP LexemeSource

lex' :: ReadP Lexeme'Source

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