[Haskell-cafe] Parsec beginners problem

[Jim Burton]

Jim Burton wrote:
> 
> 
> 
> Dougal Stanton wrote:
>> 
>> This may be relevant or not, but I thought morse required a delimiting
>> character between letters, because otherwise the message was
>> ambiguous? I seem to recall somewhere that Parsec didn't handle
>> non-deterministic parsings very well (or at all).
>> 
>> D.
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>> 
>> 
> 
> You could be right about delimiters, but handling the ambiguous instances
> is the challenge in this case, which is a Ruby Quiz
> [http://www.rubyquiz.com/quiz121.html] - I thought it would be a good use
> for Parsec, and the user guide talks about try..<|> as the tool for it, as
> in 
> 
> testOr2 =   try (string "(a)")
>         <|> string "(b)"
> 
> 

After posting I realised the difference between parsing "(a)" <|> "(b)" and
parsing "a" <|> "aa" ... so Parsec doesn't do the latter well or at all?

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