Re: Plans to integrate a wisent grammar in php-mode

2015-04-12 3:26 GMT+02:00 Eric Ludlam <[email protected]>:

> On 04/11/2015 09:44 AM, Steven Rémot wrote:
>
>> Hello,
>>
>> some people in the PHP-Emacs sphere are showing interest in having a
>> proper support of PHP in Semantic.
>>
>> First of all, ejmr, the maintainer of php-mode, would like to integrate
>> semantic support for PHP directly in php-mode [1]. He has been in touch
>> with Andrea Turso, who started working on this in his personal
>> configuration.
>>
>> As I am also working on improving Semantic support for PHP, Andrea
>> contacted my so that we can join our forces on this project.
>>
>> Actually I like the plans of ejmr and Andrea. They would like to
>> integrate in php-mode a really basic Semantic support for PHP, mainly
>> for tagging purposes, and implement the more complex tasks (code
>> analysis, type inference, refactoring, etc...) in external packages,
>> using minor modes. This would allow people to have simple semantic
>> support out of the box, and to easily get other features if needed.
>>
>> In term of planning, we already thought about short and long term goals :
>>
>>   * In the short term, we would work in a code base outside of CEDET and
>>     php-mode. We would implement a new grammar as close as possible to
>>     the PHP specification [2], and free of any shift/reduce -
>>     reduce/reduce conflict. This grammar would parse the whole language,
>>     so that it can be used for tagging and code analysis.
>>   * In the long term, we would separate basic Semantic support for
>>     tagging and more complex support for code analysis in different
>>     grammars. The basic support could be integrated in php-mode, and the
>>     other ones would be in one / several minor modes.
>>
>>
>> As there is already some code for PHP in the CEDET repository, and as
>> the CEDET team have obviously more experience than Andrea and I in
>> CEDET-related stuffs, we would like to know what you think about it. Do
>> you think it is a good idea to implement Semantic support for PHP
>> outside of CEDET repository, and to split it like that? And do you think
>> it is technically feasible to do so?
>>
>> Regards,
>> Steven Rémot
>>
>> [1] https://github.com/ejmr/php-mode/issues/235
>> [2] https://github.com/php/php-langspec/blob/master/spec/19-grammar.md
>>
>
> Thanks for the details Steven,
>
> Supporting a grammar for a language outside of the CEDET repository is a
> fine thing to do.  Many grammars in CEDET today started outside of our
> repository.  If you would like to keep it separate, that is fine too. The
> specifics around how the grammar compiles and executes has been stable for
> quite some time and would work well for you.
>
> Your idea for adding support for complex tools as minor modes is the same
> pattern CEDET uses, so that should be well supported.
>
> If you choose to start with the php support in the CEDET contrib
> directory, you need to know that it was contributed by someone who didn't
> want his name attached to it, and couldn't get papers assigned. If you have
> a goal of being part of Emacs or one of the other repositories that need
> assignments, you will need to start from scratch. :(
>
> Good Luck!
> Eric
>

Thanks for the reply Eric,

Actually I was much more concerned with the fact that there will be at
least two grammars for the same language: a simple one and a more complete
one. I was not sure this was the best solution as it could lead to a lot of
copy-pasting from one to another. But as they have different goals I
suppose this is OK.

We don't have any copyright assignment constraint I think, but starting a
new project is the occasion to write a brand new grammar, as close as
possible to the official specification, so I suppose the code in CEDET
contrib directory will only be used as a reference to know how to make
things work.

Thank you for your support!
Steven Rémot

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