Extending PHP support - facing problems with expansion of list of aliases

Hi,

as I use PHP for my job, I'm currently working on enhancing PHP support 
in CEDET, mainly by extending the current grammar.

So far, I have added :
- namespaces
- optional type annotation for function's arguments
- Better support for class fields and constants

I am working on a separated repository at the address :

https://bitbucket.org/stevenremot/cedet/

I wanted to talk about it and propose it to be included in the main 
cedet repository later, when I have some more features, but I'm a 
beginner in grammar writing, and I have difficulties to correctly create 
tags for the PHP "use" statement.

This statement can be seen as a typedef. If you want to use a class 
named A\B\C\Foo ("\" is the common namespace separator) by calling it 
just "ABCFoo", you can type :

use A\B\C\Foo as ABCFoo;

If you want to call it Foo, you just have to type :

use \A\B\C\Foo;

My current work handles this well, and creates an alias tag for it.

However, you can also chain multiple renamings in a single use statement 
like this :

use A\B\C\Bar, \A\B\Foo;

My current solution for handling this is :

use_statement
   : T_USE use_declarations T_SEMI
     (EXPANDTAG $2)
   ;

use_declarations
   : use_declaration T_COMMA use_declarations
     (append $3 (EXPANDTAG $1))
   | use_declaration
     (EXPANDTAG $1)
   ;

use_declaration
   : namespaced_identifier T_AS IDENTIFIER
     (ALIAS-TAG $3 "alias" $1)
   | namespaced_identifier
     (ALIAS-TAG (car (last (split-string $1 "\\\\"))) "alias" $1)
   ;

(My usage of ALIAS-TAG may be wrong, I did not really know how to handle 
the second argument as I can't know the type of A\B\C\Foo for now)

But with these rules no tag is created on multiple renamings. I think 
either my use of EXPANDTAG or my concatenation of aliases is wrong, but 
I can't find any nice solution to fix it.

Does someone know how I could handle it ?

--
Steven Rémot

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