-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Leonardo Rochael Almeida wrote: > Funny you should mention this, I've got this idea bugging for a few > weeks now, after the last thread: > > Have the zope.interface package expose a single overridable hook: > > def getInterfaceAttribute(iface, name, default): > > This method would be called by any attempt to look up an interface > attribute that isn't provided by zope.interface itself. For example: > > IFoo.adapter(bar, default=baz) > > Would be the almost the same as: > > getInterfaceAttribute(IFoo, 'adapter', default=somemarker)(bar, default=baz) > > That is unless getInterfaceAttribute(IFoo, 'adapter') returned the > passed-in marker which would instruct zope.interface to raise an > AttributeError instead. > > In turn, "zope.component" could then provide a getInterfaceAttribute() > implementation that called: > > getAdapter(IFoo, interface=IInterfaceMethod, name='adapter') > > Yes, the first parameter above is the original interface. The > IInterfaceMethod is an interface defining __call__(*args, **kw) > > This idea would also allow one to define named adapters for > IInterfaceMethod to, for instance, "__call__" or "__add__", such that > the semantics of "IFoo(...)" or "IFoo + IBar" could also be changed. > > Perhaps entry points could be used to provide getInterfaceAttribute > implementations, and if multiple entry points are present, each would > be called in turn to attempt to provide the attributes of an > interface, but maybe this is too much flexibility... > > Just an idea...
I had originally contemplated replacing the current adapter hook with a more generic hook: the __call__ of interface would delegate to this hook for its semantics. Given that the choice to use __call__ is not widely enough accepted, I think something like your solution makes sense. I'm not sure that hooking __getattr__ is going to be performant enough, but a similar mechanism probably could be made fast enough. Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tsea...@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAksoDpQACgkQ+gerLs4ltQ4LkACgxb9GzzGU7RAnj9rTEhJMVnJ9 iVwAniefCS8HXGyEiSxG7V7fYWJISsrZ =bmx9 -----END PGP SIGNATURE----- _______________________________________________ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )
