25 Mar
2008
25 Mar
'08
12:19 p.m.
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 Parsec letter.