4 -- |A set of auxiliary parser utilities.
5 module Network.HTTP.Lucu.Parser
14 import Control.Applicative
15 import Control.Applicative.Unicode
16 import Control.Monad.Unicode
17 import Data.Attoparsec.Char8
18 import Prelude.Unicode
20 -- |@'atMost' n v@ is like @'P.many' v@ but accumulates @v@ at most
22 atMost ∷ Alternative f ⇒ Int → f α → f [α]
23 {-# INLINEABLE atMost #-}
25 atMost n v = ( (:) <$> v ⊛ atMost (n-1) v )
29 -- |@'finishOff' p@ is equivalent to @p '>>=' \\a -> 'endOfInput' '>>'
31 finishOff ∷ Parser α → Parser α
32 {-# INLINE finishOff #-}
33 finishOff = ((endOfInput *>) ∘ return =≪)
35 -- |Similar to 'manyTill' but discards the result.
36 skipManyTill ∷ Alternative f ⇒ f α → f β → f ()
37 {-# INLINEABLE skipManyTill #-}
38 skipManyTill p end = go
40 go = (end *> pure ()) <|> (p *> go)
42 -- |Similar to 'skipWhile' but consumes at least one character.
43 skipWhile1 ∷ (Char → Bool) → Parser ()
44 {-# INLINE skipWhile1 #-}
45 skipWhile1 p = takeWhile1 p *> pure ()
47 -- |Similar to 'skipSpace' but consumes at least one whitespace.
48 skipSpace1 ∷ Parser ()
49 {-# INLINE skipSpace1 #-}
50 skipSpace1 = skipMany1 space
52 -- |@'isAlphaNum' c@ returns 'True' iff @'isDigit' c ||
53 -- 'isAlpha_ascii' c@.
54 isAlphaNum ∷ Char → Bool
55 {-# INLINE isAlphaNum #-}
56 isAlphaNum c = isDigit c ∨ isAlpha_ascii c