[Haskell-cafe] Parsec question

C K Kashyap ckkashyap at gmail.com
Wed Jul 24 16:26:29 CEST 2013

Dear Cafe,

I am trying to implement[1] parsec in go using the "Monadic Parser
Combinators" paper [2] . I've been able to implement "plus" "bind" and
While doing the implementation - I looked at bind closely

bind :: Parser a -> (a -> Parser b) -> Parser b
p `bind` f = \inp -> concat [f v inp' | (v,inp') <- p inp]

I wondered if the result needs the complete list - wouldn't just the first
successful value suffice?
Perhaps -
p `bind` f = \inp -> take 1 $ concat [f v inp' | (v,inp') <- p inp]

Will this miss out matches?


[1] https://github.com/ckkashyap/parsec/blob/master/parsec.go
[2] Monadic Parser Combinators: Graham Hutton, Erik Meijer
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