On Fri, Apr 14, 2017 at 07:02:37PM +0100, mike h wrote:
I have data PackageDec = Pkg String deriving Show
and a parser for it
packageP :: Parser PackageDec packageP = do literal “package" x <- identifier xs <- many ((:) <$> char '.' <*> identifier) return $ Pkg . concat $ (x:xs)
so I’m parsing for this sort of string “package some.sort.of.name”
and I’m trying to rewrite the packageP parser in applicative style. As a not quite correct start I have
Hello Mike, I am not really sure what you are doing here? You are parsing a dot separated list (like.this.one) but at the end you are concatenating all together, why? Are you sure you are not wanting [String] instead of String? If so, Parsec comes with some handy parser combinators [1], maybe one of them could fit your bill: -- should work packageP = literal "package" *> Pkg <$> sepEndBy1 identifier (char '.') [1] https://hackage.haskell.org/package/parsec-3.1.11/docs/Text-Parsec-Combinato...