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darcs-hash:49d6ae9061e31817c5162f6d61114ad61df7570d

Removed unnecessary redefinition warnings for layered classes in Allegro and LispWorks (due to Tobias Rittweiler, with help from Duane Rettig and Martin Simmons).

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darcs-hash:88ef5b1bafa84e6771285eb28de557f3a3948999

This version of ContextL (0.4) incorporates several minor and major changes as a preparation towards a 1.0 release. Here is a list of the changes:

--- Changes in the visible API ---

+ The functions activate-layer and activate-layer-using-class have been renamed to adjoin-layer and adjoin-layer-using-class, and deactivate-layer and deactivate-layer-using-class have been renamed to remove-layer and remove-layer-using-class. The new names reflect better what these functions actually do.

+ Removed the functions funcall-with-layers and apply-with-layers. Use the functions funcall-with-layer-context and apply-with-layer-context instead.

+ The deflayer macro doesn't take a :layer-class option anymore, but instead a :metaclass option. (I have tried to abstract from the internal representation as CLOS classes, but that turns out to be useless for the time being.)

--- Additions to the visible API ---

+ Added the functions funcall-with-layer-context and apply-with-layer-context.

+ Added the function current-layer-context. This captures the set of currently active layers, which can later be reinstalled with funcall-with-layer-context and apply-with-layer-context.

+ Added the metaclasses layered-function and layered-method. However, they should better not be used directly. For programmatically creating layered functions and methods, better use the functions ensure-layered-function and ensure-layered-method.

+ Added the readers layered-function-definer, layered-function-argument-precedence-order, layered-function-lambda-list.

+ Added the readers layered-method-lambda-list, layered-method-specializers, layered-method-layer.

+ Added the readers partial-class-defining-classes, partial-class-defining-metaclass and the class partial-object, which is the default superclass for partial classes.

+ Added the readers slot-definition-layered-readers and slot-definition-layered-writers.

+ You can now specify an :in-layer option in slot specifiers. This means that a slot within a define-layered-class form can be declared to be in a different layer than the respective class itself. This allows, for example, to group slots of different layers in the same define-layered-class form.

+ Layers and layered functions can now also have uninterned symbols as names. This enables a form of anonymous layers and anonymous layered functions when gensym is used to create names for them.

+ Added the function ensure-layer for programmatically creating layers.

--- Internal changes, which are not necessarily visible ---

+ If someone tries to define default initargs for singleton classes or layers, ContextL emits a warning. The error handling is improved for the case when the :allocation for a singleton or layer-specific slot is set to something else than :class.

+ Some of the :in-layer keyword parameters to internal functions have previously taken lists of layers for technical reasons. This is not the case anymore.

+ Changed the handling of the :defining-metaclass option for partial classes.

+ Layered direct slot definition metaobjects don't take :layered-reader, :layered-writer and :layered-accessor initargs anymore, but rather :layered-readers and :layered-writers, which is closer to how the CLOS MOP works as well.

+ Added methods for print-object for the major classes and metaclasses, such that, for example, debug output now prints more nicely.

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It's now possible to say with-inactive-layers, and the functional equivalents to with-active-layers have also been adapted to enable inactivation of layers. During the process, a number of bugs have been revealed, especially wrt the previous removal of &allow-other-keys and problems related to finalize-inheritance in Allegro Common Lisp.

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