[Haskell-cafe] Parsec (Zero or One of)
derek.a.elkins at gmail.com
Tue Mar 25 12:19:33 EDT 2008
On Tue, 2008-03-25 at 11:47 -0400, Albert Y. C. Lai wrote:
> Paul Keir wrote:
> > I’m having some difficulty using the Parsec library, perhaps you could
> > help. I’ve reduced my problem as shown below. I would like the
> > ‘only_prod’ parser to require the reserved string “only”, _optionally_
> > followed by an identifier. As part of ‘mytest’, this should then be
> > followed by the reserved string “end”.
> Look into option, optional, and optionMaybe.
And in particular, try doesn't do what you (Paul) think it does. try
however is a rather important combinator of Parsec so I would behoove
you to look up it's documentation and the explanations of it in the
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