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Re: Is intellisense features integration in Emacs technically possible?

From: David Engster
Subject: Re: Is intellisense features integration in Emacs technically possible?
Date: Wed, 22 Jan 2014 18:36:00 +0100
User-agent: Gnus/5.130008 (Ma Gnus v0.8) Emacs/24.3 (gnu/linux)

Dmitry Gutov writes:
> David Engster <address@hidden> writes:
>>> Writing a C++ parser and semantic analyzer from scratch requires several
>>> man-years of work for world-class compiler writers.
>> You don't need a full parser. For providing completions, it is
>> sufficient to parse only a small subset of the code (declarations, most
>> importantly).
> You may not have to parse every line of code, but you should be able to, no?
> Otherwise, how would you know which type the variable at point has,

By scanning the function's body for local variable declarations, and
simply ignore everything else. The C++ grammar simply has a bunch of
pretty generic expression rules without any actions, so we can skip over
the uninteresting stuff.

So yes, I wasn't specific enough: technically, we do parse function
bodies. But practically, we ignore most of it.

Of course there's a drawback that we don't fully parse the body - we
might get the local context wrong, for instance. But at least from my
experience it's working very well.

> or the return type of the method it calls

By parsing the declaration of the method.


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