Tuesday, April 23, 2013

Re: vim + ctags for C++ problem

On Tuesday, April 23, 2013 3:20:29 AM UTC-5, Jacek Czaja wrote:
>
> And now my cursor is somewhere in main function and I want to jump to beta::b definition so I do:
>
> :ta beta::b
>
> and vim jumps to alpha::b ???
>
>
> When I print possibilities:
>
> :ts
>
> it is something like:
> beta::b
> class:beta access:public
> int b;
>
> So :ts properly is showing the jump location but for some reason calling it via:
>
> :ta beta::b
>
>
> gives me wrong result.
>
> All this problem happns only if I have two or more classes definition in the same file. If they are spread around diffrent files then it is all fine.
>

I generated tags from your file using the ctags command you gave, and I can reproduce the problem.

I also see the cause.

With the options you give, the tag file entries for alpha::b and beta::b both have the same search pattern. Here are their entries:

alpha::b .\test.cpp /^ int b;$/;" m class:alpha file: access:private
beta::b .\test.cpp /^ int b;$/;" m class:beta file: access:public

I'm not sure whether this can be fixed.

I know the tagbar plugin ( http://www.vim.org/scripts/script.php?script_id=3465 ) can correctly jump to each tag, but I don't know how this is accomplished. You could look into the plugin or contact the author.

Certainly, you could also post-process your tags file to modify the search pattern. This may be how tagbar does it, I do not know.

If I manually edit the generated tags file to include a search for the class before a search for the tag itself, I can correctly jump to beta::b and alpha::b with the :tag command:

alpha::b .\test.cpp /class alpha/;/^ int b;$/;" m class:alpha file: access:private
beta::b .\test.cpp /class beta/;/^ int b;$/;" m class:beta file: access:public

Note my introduction of /class alpha/; and /class beta/; to perform a double search in each case.

This could certainly be automated, since the class name is right in the tag definition. I'll leave that to you.

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