W3cubDocs

Text.Read.Lex

Copyright	(c) The University of Glasgow 2002
License	BSD-style (see the file libraries/base/LICENSE)
Maintainer	[email protected]
Stability	provisional
Portability	non-portable (uses Text.ParserCombinators.ReadP)
Safe Haskell	Trustworthy
Language	Haskell2010

Description

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

data Lexeme Source

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: base-4.6.0.0
EOF

Instances

Instances details

Eq Lexeme	Since: base-2.1
Instance details Defined in Text.Read.Lex Methods (==) :: Lexeme -> Lexeme -> Bool Source (/=) :: Lexeme -> Lexeme -> Bool Source
Read Lexeme	Since: base-2.1
Instance details Defined in GHC.Read Methods readsPrec :: Int -> ReadS Lexeme Source readList :: ReadS [Lexeme] Source readPrec :: ReadPrec Lexeme Source readListPrec :: ReadPrec [Lexeme] Source
Show Lexeme	Since: base-2.1
Instance details Defined in Text.Read.Lex Methods showsPrec :: Int -> Lexeme -> ShowS Source show :: Lexeme -> String Source showList :: [Lexeme] -> ShowS Source

data Number Source

Since: base-4.6.0.0

Instances

Instances details

Eq Number	Since: base-4.6.0.0
Instance details Defined in Text.Read.Lex Methods (==) :: Number -> Number -> Bool Source (/=) :: Number -> Number -> Bool Source
Show Number	Since: base-4.6.0.0
Instance details Defined in Text.Read.Lex Methods showsPrec :: Int -> Number -> ShowS Source show :: Number -> String Source showList :: [Number] -> ShowS Source

numberToInteger :: Number -> Maybe Integer Source

Since: base-4.5.1.0

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

Since: base-4.7.0.0

numberToRational :: Number -> Rational Source

Since: base-4.6.0.0

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

Since: base-4.5.1.0

lex :: ReadP Lexeme Source

expect :: Lexeme -> ReadP () Source

Since: base-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

isSymbolChar :: Char -> Bool Source

© The University of Glasgow and others
Licensed under a BSD-style license (see top of the page).
https://downloads.haskell.org/~ghc/8.8.3/docs/html/libraries/base-4.13.0.0/Text-Read-Lex.html