Plans to integrate a wisent grammar in php-mode

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

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