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Text.ParserCombinators.ReadP Portability portable Stability provisional Maintainer libraries@haskell.org

Contents

The ReadP type Primitive operations Other operations Conversions

Description

ReadP is a library of parser combinators, originally written by Koen Claessen. It parses all alternatives in parallel, so it never keeps hold of the beginning of the input string, a common source of space leaks with other parsers. The '(+++)' choice combinator is genuinely commutative; it makes no difference which branch is shorter.

Synopsis

data ReadP a get :: ReadP Char look :: ReadP String (+++) :: ReadP a -> ReadP a -> ReadP a gather :: ReadP a -> ReadP (String, a) pfail :: ReadP a satisfy :: (Char -> Bool) -> ReadP Char char :: Char -> ReadP Char string :: String -> ReadP String munch :: (Char -> Bool) -> ReadP String munch1 :: (Char -> Bool) -> ReadP String skipSpaces :: ReadP () choice :: [ReadP a] -> ReadP a readP_to_S :: ReadP a -> ReadS a readS_to_P :: ReadS a -> ReadP a

The ReadP type

data ReadP a

Instances Functor ReadP Monad ReadP MonadPlus ReadP

Primitive operations

get :: ReadP Char

look :: ReadP String

(+++) :: ReadP a -> ReadP a -> ReadP a

gather :: ReadP a -> ReadP (String, a)

Transforms a parser into one that does the same, but in addition returns the exact characters read. IMPORTANT NOTE: gather gives a runtime error if its first argument is built using any occurrences of readS_to_P.

Other operations

pfail :: ReadP a

satisfy :: (Char -> Bool) -> ReadP Char

char :: Char -> ReadP Char

string :: String -> ReadP String

munch :: (Char -> Bool) -> ReadP String

munch1 :: (Char -> Bool) -> ReadP String

skipSpaces :: ReadP ()

choice :: [ReadP a] -> ReadP a

Conversions

readP_to_S :: ReadP a -> ReadS a

readS_to_P :: ReadS a -> ReadP a

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