split c.c into two parts

[techee]

This is what I proposed in

#3327

with some modifications:

1. I got a bit lazy and didn't remove any code from c.c which I left more or less as it was before - I could remove the extra languages if desired, I'm just not sure if it's worth the work since this file probably won't be actively maintained.
2. I also removed Vera from c-based.c (and use the parser from c.c). The language seems to be mostly dead without any proper documentation and this makes c-based.c hard to maintain because nobody knows properly what code is there because of Vera and what it should do. c.c seems to be a good graveyard for Vera to me.

I really just fixed the compilation errors and didn't go through the parser in detail - I'm pretty sure that there's some code left which is only specific to C/C++ (but which isn't explicitly guarded for these languages) so there probably are some things which are unnecessary.

[codecov]

Codecov Report

Merging #3332 (4861e8e) into master (2f69ee9) will decrease coverage by 2.27%.
The diff coverage is 72.45%.

@@            Coverage Diff             @@
##           master    #3332      +/-   ##
==========================================
- Coverage   85.44%   83.16%   -2.28%     
==========================================
  Files         216      218       +2     
  Lines       50319    52235    +1916     
==========================================
+ Hits        42995    43442     +447     
- Misses       7324     8793    +1469     

Impacted Files	Coverage Δ
parsers/c-based.c	80.59% <ø> (ø)
parsers/c.c	2.72% <ø> (-76.16%)	⬇️
parsers/vera.c	72.45% <72.45%> (ø)

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[masatake]

I'm negative about removing the Vera parser.

How about doing the following?

1. copy c-base.c from c.c as you did.
   1.1 remove C/C++ specific code from c-base.c as you did.
   1.2 remove parser definitions other than C/C++ from c.c as you did.
2. copy vera.c from c-base.c.
   2.1 remove parser definitions other than Vera from vera.c.
3. remove Vera from c-base.c as you did.
4. do as you planned in Splitting c.c into two parsers (c/c++ parser & the parser of the rest) #3327.

2. and 2.1. are the extra steps. You don't have to touch vera.c more, of course.

The commits up to f2b6293 look good to me.
Thank you.

[techee]

@masatake Done.

[masatake]

Thank you for taking your time.
Could you rebase this pull request on the latest master?
@leleliu008 and I fixed the trouble on CI/CD environment targeting FreeBSD / testing (pull_request) .

[techee]

Could you rebase this pull request on the latest master?

Done.

[masatake]

Thank you. Please, wait for awhile.

[masatake]

Thank you very much for updating vera.c.

[masatake]

Thank you very much.