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improve efficiency of applicative interface

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mrkkrp 2015-07-31 01:43:25 +06:00
parent 0123e43eb5
commit b19dae4315
1 changed files with 4 additions and 2 deletions
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Text/MegaParsec/Prim.hs
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@ -172,8 +172,10 @@ parsecMap f p = ParsecT $ \s cok cerr eok eerr ->
unParser p s (cok . f) cerr (eok . f) eerr
instance A.Applicative (ParsecT s u m) where
pure = return
(<*>) = ap -- TODO: Can this be optimized?
pure = return
(<*>) = ap -- TODO: Can this be optimized?
(*>) = (>>)
p1 <* p2 = do { x1 <- p1 ; void p2 ; return x1 }
instance A.Alternative (ParsecT s u m) where
empty = mzero