Posted by Lukas Renggli on Oct 08, 2010; 8:15pm
URL: https://forum.world.st/Consuming-delimiters-in-PetitParser-tp2968917p2968977.html

Hi Hernán,

I am not really sure what you want to express with the following parser?

    ( #digit asParser plus flatten plusLazy: $| asParser )

Having multiple quantifications (#optional, #plus, #plusLazy:,
#plusGreedy:, #star, #starLazy:, #plusGreedy:, #times:, #min:,
#min:max:) in a row does not really make sense and seems likely a bug.
In your example the #plusLazy: will only be able to consume the
receiver once. As you can read in the method comment of #plusLazy: the
argument is not consumed, thus whatever follows will have to consume
it.

If you want to accept multiple numbers like in

    >gi|123|456|789|abc

then you should likely use #separatedBy: like in

   p := ( $> asParser , 'gi' asParser , $| asParser ,
        ( #digit asParser plus flatten separatedBy: $| asParser ) ,
        ($| asParser) ,
        ( (#letter asParser / #digit asParser / #space asParser /
#punctuation asParser ) asParser plus flatten ) ) end.

If you just want one number then the simpler

   p := ( $> asParser , 'gi' asParser , $| asParser ,
        ( #digit asParser plus flatten ) ,
        ($| asParser) ,
        ( (#letter asParser / #digit asParser / #space asParser /
#punctuation asParser ) asParser plus flatten ) ) end.

will do.

Let us know if this solves your problem.

Lukas


On 8 October 2010 21:29, Hernán Morales Durand <[hidden email]> wrote:


--
Lukas Renggli
www.lukas-renggli.ch

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