base-4.0.0.0: Basic libraries Contents Index

Text.Read.Lex Portability non-portable (uses Text.ParserCombinators.ReadP) Stability provisional Maintainer libraries@haskell.org

Description

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

Synopsis

data Lexeme = Char Char | String String | Punc String | Ident String | Symbol String | Int Integer | Rat Rational | EOF lex :: ReadP Lexeme hsLex :: ReadP String lexChar :: ReadP Char readIntP :: Num a => a -> (Char -> Bool) -> (Char -> Int) -> ReadP a readDecP :: Num a => ReadP a

Documentation

data Lexeme

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 Eq Lexeme Read Lexeme Show Lexeme

lex :: ReadP Lexeme

hsLex :: ReadP String

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

lexChar :: ReadP Char

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

readDecP :: Num a => ReadP a

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