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

Contents Precedences Precedence operations Other operations Converters

Description

This library defines parser combinators for precedence parsing.

Synopsis

data ReadPrec a type Prec = Int minPrec :: Prec lift :: ReadP a -> ReadPrec a prec :: Prec -> ReadPrec a -> ReadPrec a step :: ReadPrec a -> ReadPrec a reset :: ReadPrec a -> ReadPrec a get :: ReadPrec Char look :: ReadPrec String (+++) :: ReadPrec a -> ReadPrec a -> ReadPrec a (<++) :: ReadPrec a -> ReadPrec a -> ReadPrec a pfail :: ReadPrec a choice :: [ReadPrec a] -> ReadPrec a readPrec_to_P :: ReadPrec a -> Int -> ReadP a readP_to_Prec :: (Int -> ReadP a) -> ReadPrec a readPrec_to_S :: ReadPrec a -> Int -> ReadS a readS_to_Prec :: (Int -> ReadS a) -> ReadPrec a

Documentation

data ReadPrec a

Instances Functor ReadPrec Monad ReadPrec MonadPlus ReadPrec

Precedences

type Prec = Int

minPrec :: Prec

Precedence operations

lift :: ReadP a -> ReadPrec a

Lift a predence-insensitive ReadP to a ReadPrec

prec :: Prec -> ReadPrec a -> ReadPrec a

(prec n p) checks that the precedence context is less than or equal to n, * if not, fails * if so, parses p in context n

step :: ReadPrec a -> ReadPrec a

Increases the precedence context by one

reset :: ReadPrec a -> ReadPrec a

Resets the precedence context to zero

Other operations

get :: ReadPrec Char

look :: ReadPrec String

(+++) :: ReadPrec a -> ReadPrec a -> ReadPrec a

(<++) :: ReadPrec a -> ReadPrec a -> ReadPrec a

pfail :: ReadPrec a

choice :: [ReadPrec a] -> ReadPrec a

Converters

readPrec_to_P :: ReadPrec a -> Int -> ReadP a

readP_to_Prec :: (Int -> ReadP a) -> ReadPrec a

readPrec_to_S :: ReadPrec a -> Int -> ReadS a

readS_to_Prec :: (Int -> ReadS a) -> ReadPrec a

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