base-4.3.1.0: Basic libraries

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

Text.Read.Lex

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
readOctP :: Num a => ReadP a
readDecP :: Num a => ReadP a
readHexP :: Num a => ReadP a

Documentation

data Lexeme Source

Haskell lexemes.

Constructors

Character literal

String literal, with escapes interpreted

Punctuation or reserved symbol, e.g. (, ::

Haskell identifier, e.g. foo, Baz

Haskell symbol, e.g. >>, :%

Integer literal

Floating point literal

Instances

lex :: ReadP Lexeme Source

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 aSource

readOctP :: Num a => ReadP aSource

readDecP :: Num a => ReadP aSource

readHexP :: Num a => ReadP aSource