Re: [Opencxx-users] parse errors on valid C++

[Stefan S. <se...@sy...>]

Grzegorz Jakacki wrote:
> Hi Stefan,
> 
> On Sun, 4 Apr 2004, Stefan Seefeld wrote:
> 
> 
>>there are some valid C++ expressions openC++ doesn't
>>yet understand.
>>
>>I'v just run into a fairly simple one:
>>
>>namespace Foo = Bar;
>>
>>that creates a namespace alias. Is there any chance
>>that the parser gets fixed to recognize this ?
> 
> 
> Yes, however parser is not self-healing system. AFAIK I am the only person

heh :-)

> doing anything to the code at the moment. I don't have resources to fix it
> now.
> 
> You hacked OpenC++ already, perhaps you could invest some time in this
> fix. Please contact me for arrangements if you decide to do so.

Fair enough. Attached is a patch that:

* adds a new token ('ntNamespaceAlias'...luckily there are still some slots available ;-)
* adds a new Ptree subclass 'PtreeNamespaceAlias'
* adds a 'rNamespaceAlias' method to the parser that generates such a ptree
* adds a dummy 'TranslateNamespaceAlias' to the Walker base class

What should the parse tree for this declaration look like ?
As I don't know any better, I just generate a simple list

[ 'namespace' <alias> '=' <scoped.name> ';' ]

(where scoped.name can be a list if it's not a simple identifier)

The Walker::TranslateNamespaceAlias() method does nothing (yet), but
should probably register the new alias to the environment. I'll let
others fill that out :-)

Regards,
		Stefan