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Bryan O'Sullivan committed 56a7a75

Add a parseOnly entry point, at Daniel Fischer's request

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Files changed (2)

Data/Attoparsec.hs

     -- * Running parsers
     , parse
     , feed
+    , I.parseOnly
     , parseWith
     , parseTest
 

Data/Attoparsec/Internal.hs

 
     -- * Running parsers
     , parse
+    , parseOnly
 
     -- * Combinators
     , (<?>)
 -- | Terminal failure continuation.
 failK :: Failure a
 failK i0 _a0 _m0 stack msg = Fail (unI i0) stack msg
+{-# INLINE failK #-}
 
 -- | Terminal success continuation.
 successK :: Success a a
 successK i0 _a0 _m0 a = Done (unI i0) a
+{-# INLINE successK #-}
 
 -- | Run a parser.
 parse :: Parser a -> B.ByteString -> Result a
 parse m s = runParser m (I s) (A B.empty) Incomplete failK successK
 {-# INLINE parse #-}
+
+-- | Run a parser that cannot be resupplied via a 'Partial' result.
+parseOnly :: Parser a -> B.ByteString -> Either String a
+parseOnly m s = case runParser m (I s) (A B.empty) Complete failK successK of
+                  Fail _ _ err -> Left err
+                  Done _ a     -> Right a
+                  _            -> error "parseOnly: impossible error!"
+{-# INLINE parseOnly #-}