Re: [pygccxml-development] Patch to add a little syntactic sugar

[Allen B. <al...@vr...>]

Roman Yakovenko wrote:

> On 5/17/06, Allen Bierbaum <al...@vr...> wrote:
>
>> I have included a patch that I find useful for simplifying decl lookup
>> in pyplusplus.
>>
>> It allows code like the following to be written using the __getitem__
>> interface.
>>
>> ns = mb.global_ns.namespace( 'my_ns',)
>> ns["MyClass"].exclude()
>> class_a = ns["ClassA"]
>> class_a["doSomething"].include()
>>
>> It also allows an attribute interface (similar to Pyste).
>>
>> ns.MyClass.exclude()
>> class_a = ns.ClassA
>> class_a.doSomething.include()
>>
>> These both can be used to dramatically reduce the amount of clutter
>> (redundant code calls) using in a script to generate bindings. Although
>> the second one could be seen as a little dangerous because of potential
>> name conflicts, I think the interface of Pyste has proven that people
>> like an interface like this because it allows something that feels like
>> a very tight domain specific langauge for creating bindings.
>>
>> I know that neither of these methods is anything more then syntactic
>> sugar, but IMHO it is pretty sweet sugar. :)
>
>
> Thanks. I will apply the patch. There is only one question:
> Why not to implement the __getattr__ next way:
>        found_decls = self.decls(name=name, allow_empty=True)
>        if found_decls:
>            return found_decls
>        else:
>            raise AttributeError
> Why do you need treatment for '__' ?

I didn't originally have it but without it I was seeing a lot of 
searches for '__getnewargs__' and '__getstate__'.  I don't know why they 
were happening but I didn't think it was a good idea to spend time 
searching for decls that we know are not there.  It was more of an 
optimization then anything.

-Allen

>
>
>> -Allen
>
>
> Thanks.
>
>