attoparsec-0.8.2.0: Fast combinator parsing for bytestringsSource codeContentsIndex
Data.Attoparsec.Combinator
Portabilityportable
Stabilityexperimental
Maintainerbos@serpentine.com
Contents
Inlined implementations of existing functions
Description
Useful parser combinators, similar to those provided by Parsec.
Synopsis
choice :: Alternative f => [f a] -> f a
count :: Monad m => Int -> m a -> m [a]
option :: Alternative f => a -> f a -> f a
many1 :: Alternative f => f a -> f [a]
manyTill :: Alternative f => f a -> f b -> f [a]
sepBy :: Alternative f => f a -> f s -> f [a]
sepBy1 :: Alternative f => f a -> f s -> f [a]
skipMany :: Alternative f => f a -> f ()
skipMany1 :: Alternative f => f a -> f ()
eitherP :: Alternative f => f a -> f b -> f (Either a b)
many :: Alternative f => f a -> f [a]
Documentation
choice :: Alternative f => [f a] -> f aSource
choice ps tries to apply the actions in the list ps in order, until one of them succeeds. Returns the value of the succeeding action.
count :: Monad m => Int -> m a -> m [a]Source
Apply the given action repeatedly, returning every result.
option :: Alternative f => a -> f a -> f aSource

option x p tries to apply action p. If p fails without consuming input, it returns the value x, otherwise the value returned by p. 

 priority  = option 0 (digitToInt <$> digit)
many1 :: Alternative f => f a -> f [a]Source

many1 p applies the action p one or more times. Returns a list of the returned values of p. 

  word  = many1 letter
manyTill :: Alternative f => f a -> f b -> f [a]Source

manyTill p end applies action p zero or more times until action end succeeds, and returns the list of values returned by p. This can be used to scan comments: 

  simpleComment   = string "<!--" *> manyTill anyChar (try (string "-->"))

Note the overlapping parsers anyChar and string "<!--", and therefore the use of the try combinator.

sepBy :: Alternative f => f a -> f s -> f [a]Source

sepBy p sep applies zero or more occurrences of p, separated by sep. Returns a list of the values returned by p. 

 commaSep p  = p `sepBy` (symbol ",")
sepBy1 :: Alternative f => f a -> f s -> f [a]Source

sepBy1 p sep applies one or more occurrences of p, separated by sep. Returns a list of the values returned by p. 

 commaSep p  = p `sepBy` (symbol ",")
skipMany :: Alternative f => f a -> f ()Source
Skip zero or more instances of an action.
skipMany1 :: Alternative f => f a -> f ()Source
Skip one or more instances of an action.
eitherP :: Alternative f => f a -> f b -> f (Either a b)Source
Combine two alternatives.
Inlined implementations of existing functions
many :: Alternative f => f a -> f [a]Source
Zero or more.
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