[asdf-devel] ASDF traverse changed behavior?

[Robert Goldman]

On 3/17/10 Mar 17 -4:04 AM, Juan Jose Garcia-Ripoll wrote:
> This brings back one of the things I discussed long ago. TRAVERSE's
> behavior has to be documented and its behavior has to be specified and
> fixed. Either that or ASDF should stabilize a way to write extensions on
> top of it. I can not be hanging out there waiting for every improvement
> in ASDF to break our build system.
> 
> Incidentally, another thing that breaks ECL is that INPUT-FILES now has
> a default method with signature ((o operation) ...) That broke our
> default methods with signature ((o T) (c compiled-file))

With all due respect, I think taking over primary methods for ANY of the
existing ASDF generic functions and classes should be proclaimed to be
out of bounds for extenders.

I propose that we modify the manual (if I can figure out where! the
chapter on the object model is a real mess) to specify that extenders
should only define primary methods on classes they define themselves.
Otherwise the ASDF maintainers reserve the right to make arbitrary changes.

Modifications to generic functions --- even generic functions whose
names are exported --- for classes --- even classes whose names are
exported --- should be limited to :around, :before and :after method
definitions.

If this proposal meets with approval, we should try to figure out where
it can live in the manual.

best,
r

> 
> On Wed, Mar 17, 2010 at 9:58 AM, Juan Jose Garcia-Ripoll
> <juanjose.garciaripoll at googlemail.com
> <mailto:juanjose.garciaripoll at googlemail.com>> wrote:
> 
>     Before, if an operation defined by me, such as LIB-OP, did not
>     traverse a system, then the only operation we got was that operation
>     applied on the system, as a generic object.
> 
>     Now TRAVERSE not only imposes the LIB-OP operation on the system,
>     but it also scans the components and imposes the operation on the
>     components.
> 
>     Why such an incompatible change? It definitely screwed up ALL of
>     ECL's extensions.
> 
>     Juanjo
> 
>     -- 
>     Instituto de Física Fundamental, CSIC
>     c/ Serrano, 113b, Madrid 28006 (Spain)
>     http://tream.dreamhosters.com
> 
> 
> -- 
> Instituto de Física Fundamental, CSIC
> c/ Serrano, 113b, Madrid 28006 (Spain)
> http://tream.dreamhosters.com
> 
> 
> 
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