Text.Read.Lex

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

Documentation

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
Read Lexeme Source #

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 Source #

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 #

Eq Lexeme Source #

Since: base-2.1

Instance details

Defined in Text.Read.Lex

Methods

(==) :: Lexeme -> Lexeme -> Bool Source #

(/=) :: Lexeme -> Lexeme -> Bool Source #

data Number Source #

Since: base-4.6.0.0

Instances
Instances details
Show Number Source #

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 #

Eq Number Source #

Since: base-4.6.0.0

Instance details

Defined in Text.Read.Lex

Methods

(==) :: Number -> Number -> Bool Source #

(/=) :: Number -> Number -> Bool 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 #

readBinP :: (Eq a, Num a) => ReadP a 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 #