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GHC 10.0.0.20260917 · lts/ghc-10.0.x · 8fef28d · 2026-11-02

Modulebase-4.23.0.0Haskell2010

Text.Read.Lex

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

Synopsis

data Lexeme
data Number
value numberToInteger
value numberToFixed
value numberToRational
value numberToRangedRational
value lex
value expect
value hsLex
value lexChar
value readBinP
value readIntP
value readOctP
value readDecP
value readHexP
value isSymbolChar

Packagebase-4.23.0.0
Exports16
LanguageHaskell2010
LicenceBSD-3-Clause
SourceLex.hs

datadata Lexeme

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
EOF

Instances3Eq, Read, Show

Eq LexemeDefined in ghc-internal-10.0.0 · GHC.Internal.Text.Read.Lex
Read LexemeDefined in ghc-internal-10.0.0 · GHC.Internal.Read
Show LexemeDefined in ghc-internal-10.0.0 · GHC.Internal.Text.Read.Lex

datadata Number

Instances2Eq, Show

Eq NumberDefined in ghc-internal-10.0.0 · GHC.Internal.Text.Read.Lex
Show NumberDefined in ghc-internal-10.0.0 · GHC.Internal.Text.Read.Lex

valuenumberToInteger :: Number -> Maybe Integer

valuenumberToFixed :: Integer -> Number -> Maybe (Integer, Integer)

valuenumberToRational :: Number -> Rational

valuenumberToRangedRational :: (Int, Int) -> Number -> Maybe Rational

valuelex :: ReadP Lexeme

valueexpect :: Lexeme -> ReadP ()

valuehsLex :: ReadP String

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

valuelexChar :: ReadP Char

valuereadBinP :: (Eq a, Num a) => ReadP a

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

valuereadOctP :: (Eq a, Num a) => ReadP a

valuereadDecP :: (Eq a, Num a) => ReadP a

valuereadHexP :: (Eq a, Num a) => ReadP a

valueisSymbolChar :: Char -> Bool