Re: Design/structure X3 parser more like Qi parser

On Fri, Dec 2, 2016 at 6:33 AM, Sandro Pirkwieser
<[email protected]> wrote:
> Hi,
>
>
>
> so far we used Spirit Qi for our parsers. Mainly due to large compilation
> times we were eager to experiment with X3.
>
> It seems that there are two ways of designing a parser: (1) make the whole
> parser static, or (2) embed it in a function/method.
>
> The disadvantages of (1) are that one always has to pay the costs of
> initializing the static parser, and the rather loose encapsulation in a
> namespace.
>
> In case of (2) the parser is created each time (though it might be
> saved/cached), code reuse is more difficult (only the "main rule"), and only
> simple parsers are possible (without circular references).

Just thinking out loud, but something like this might work for you.
Unless possibly the grammar(s) need to be reentrant.

void some_method() {

    static your_grammar g;

    auto result = g.parse(...);

}

> When dealing with larger and complex parsers, these things matter. Having
> the parser encapsulated in a class would solve these issues, as was the case
> for Qi.
>
> Unfortunately we were not able to do this with X3, as on the one hand 'auto'
> cannot be used for members (and stating the actual type would be unhandy),
> and on the other hand when having the rule and the definition separated the
> linking via BOOST_SPIRIT_DEFINE does not seem to work in this context.
>
>
>
> We found the recommendation regarding the xxx.hpp, xxx.cpp and xxx_def.hpp
> structure by Joel, but is it possible to structure/design an X3 parser
> having the above issues in mind?
>
> What are your experiences with X3 when it comes to designing/structuring
> larger, complex parsers?
>
>
>
> Best regards,
>
> Sandro
>
>
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