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Subject: Re: [Boost-users] [Spirit] Comment skipper or first class member of grammar
From: Michael Powell (mwpowellhtx_at_[hidden])
Date: 2018-12-17 18:06:13

On Sun, Dec 16, 2018 at 11:31 PM Michael Powell <mwpowellhtx_at_[hidden]> wrote:
> Hello,
> I am turning a corner in my Protocol Buffers grammar, and it is now
> time for me to consider how best to approach parsing comments.
> Chiefly, I am weighing two options, I think:
> 1) A white-space, comments skipper; if memory serves there has been
> discussion about such a thing on either here, Boost mailing list, or
> other forums.

Is there a Confix parser for Spirit Qi? I see there is possible a
utility there for Classic, but I'm not sure I see one for Qi?

> 2) Or, as with some compiler environments, I'm thinking .NET
> Roslyn/C#, in particular, where "comment" elements are first class
> members of the grammar/tokens, quite literally, I think.
> I'm not quite sure how that would be expressed in terms of synthesized
> AST, when you could literally have a comment appearing virtually
> anywhere between tokens, especially of the C variety, i.e. /* this is
> a comment which may appear virtually anywhere between tokens,
> potentially */.
> Or the single line C++ variety, for example, // this is a comment
> through the rest of this line.
> // Yet, there could be multiple lines of these...
> optional myVar = true; // And can appear at the end of a line
> Thoughts? Suggestions?
> My first approach I think would be for (1) the skipper; however, for
> what I am wanting to accomplish, I can see there potentially being
> some value in capturing the comments and carrying them forward with
> the target language adapter.
> Best regards,
> Michael Powell

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