;;;----- Licensing notice ---------------------------------------------------
;;;
-;;; This file is part of the Sensble Object Design, an object system for C.
+;;; This file is part of the Sensible Object Design, an object system for C.
;;;
;;; SOD is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
"Construct and return a new SOD class with the given NAME and SUPERCLASSES.
This is the main constructor function for classes. The protocol works as
- follows. The `:lisp-class' property in PSET is checked: if it exists, it
- must be a symbol naming a (CLOS) class, which is used in place of
+ follows. The `:lisp-metaclass' property in PSET is checked: if it exists,
+ it must be a symbol naming a (CLOS) class, which is used in place of
`sod-class'. All of the arguments are then passed to `make-instance';
further behaviour is left to the standard CLOS instance construction
protocol; for example, `sod-class' defines an `:after'-method on
`shared-initialize'.
Minimal sanity checking is done during class construction; most of it is
- left for `finalize-sod-class' to do (via `check-sod-class').
-
- Unused properties in PSET are diagnosed as errors."
+ left for `finalize-sod-class' to do (via `check-sod-class')."
(with-default-error-location (location)
(let* ((pset (property-set pset))
- (class (make-instance (get-property pset :lisp-class :symbol
- 'sod-class)
+ (best-class (or (get-property pset :lisp-metaclass :symbol nil)
+ (if superclasses
+ (maximum (mapcar #'class-of superclasses)
+ #'subtypep
+ (format nil "Lisp metaclass for ~A"
+ name))
+ 'sod-class)))
+ (class (make-instance best-class
:name name
:superclasses superclasses
:location (file-location location)
:pset pset)))
- (check-unused-properties pset)
class)))
(export 'guess-metaclass)
This is the main constructor function for slots. This is a generic
function primarily so that the CLASS can intervene in the construction
- process. The default method uses the `:lisp-class' property (defaulting
+ process. The default method uses the `:slot-class' property (defaulting
to `sod-slot') to choose a (CLOS) class to instantiate. The slot is then
constructed by `make-instance' passing the arguments as initargs; further
behaviour is left to the standard CLOS instance construction protocol; for
- example, `sod-slot' defines an `:after'-method on `shared-initialize'.
-
- Unused properties on PSET are diagnosed as errors."))
+ example, `sod-slot' defines an `:after'-method on `shared-initialize'."))
(export 'make-sod-instance-initializer)
(defgeneric make-sod-instance-initializer
construction process. The default method looks up the slot using
`find-instance-slot-by-name', calls `make-sod-initializer-using-slot' to
actually make the initializer object, and adds it to the appropriate list
- in CLASS.
-
- Unused properties on PSET are diagnosed as errors."))
+ in CLASS."))
(export 'make-sod-class-initializer)
(defgeneric make-sod-class-initializer
construction process. The default method looks up the slot using
`find-class-slot-by-name', calls `make-sod-initializer-using-slot' to
actually make the initializer object, and adds it to the appropriate list
- in CLASS.
-
- Unused properties on PSET are diagnosed as errors."))
+ in CLASS."))
(export 'make-sod-initializer-using-slot)
(defgeneric make-sod-initializer-using-slot
This generic function does the common work for constructing instance and
class initializers. It can usefully be specialized according to both the
- class and slot types. The default method uses the `:lisp-class' property
- (defaulting to INIT-CLASS) to choose a (CLOS) class to instantiate. The
- slot is then constructed by `make-instance' passing the arguments as
- initargs; further behaviour is left to the standard CLOS instance
- construction protocol; for example, `sod-initializer' defines an
+ class and slot types. The default method uses the `:initializer-class'
+ property (defaulting to INIT-CLASS) to choose a (CLOS) class to
+ instantiate. The slot is then constructed by `make-instance' passing the
+ arguments as initargs; further behaviour is left to the standard CLOS
+ instance construction protocol; for example, `sod-initializer' defines an
`:after'-method on `shared-initialize'.
Diagnosing unused properties is left for the caller (usually
This is the main constructor function for messages. This is a generic
function primarily so that the CLASS can intervene in the construction
- process. The default method uses the `:lisp-class' property (defaulting
- to `sod-message') to choose a (CLOS) class to instantiate. The message is
- then constructed by `make-instance' passing the arguments as initargs;
- further behaviour is left to the standard CLOS instance construction
- protocol; for example, `sod-message' defines an `:after'-method on
- `shared-initialize'.
-
- Unused properties on PSET are diagnosed as errors."))
+ process. The default method uses the `:message-class' property to choose
+ a (CLOS) class to instantiate; if no such property is provided but a
+ `combination' property is present, then `aggregating-message' is chosen;
+ otherwise `standard-message' is used. The message is then constructed by
+ `make-instance' passing the arguments as initargs; further behaviour is
+ left to the standard CLOS instance construction protocol; for example,
+ `sod-message' defines an `:after'-method on `shared-initialize'."))
(export 'make-sod-method)
(defgeneric make-sod-method
invokes `make-sod-method-using-message' to make the method object, and
then adds the method to the class's list of methods. This split allows
the message class to intervene in the class selection process, for
- example.
-
- Unused properties on PSET are diagnosed as errors."))
+ example."))
(export 'make-sod-method-using-message)
(defgeneric make-sod-method-using-message
This is a generic function so that it can be specialized according to both
a class and -- more particularly -- a message. The default method uses
- the `:lisp-class' property (defaulting to the result of calling
+ the `:method-class' property (defaulting to the result of calling
`sod-message-method-class') to choose a (CLOS) class to instantiate. The
method is then constructed by `make-instance' passing the arguments as
initargs; further behaviour is left to the standard CLOS instance
"Return the preferred class for methods on MESSAGE.
The message can inspect the PSET to decide on a particular message. A
- `:lisp-class' property will usually override this decision: it's then the
- programmer's responsibility to ensure that the selected method class is
- appropriate."))
+ `:method-class' property will usually override this decision: it's then
+ the programmer's responsibility to ensure that the selected method class
+ is appropriate."))
(export 'check-message-type)
(defgeneric check-message-type (message type)
This is separated out of `shared-initialize', where it's called, so that
it can be overridden conveniently by subclasses."))
-;;;--------------------------------------------------------------------------
-;;; Builder macros.
-
-(export 'define-sod-class)
-(defmacro define-sod-class (name (&rest superclasses) &body body)
- "Construct a new SOD class called NAME in the current module.
-
- The new class has the named direct SUPERCLASSES, which should be a list of
- strings.
-
- The BODY begins with a sequence of alternating keyword/value pairs
- defining properties for the new class. The keywords are (obviously) not
- evaluated, but the value forms are.
-
- The remainder of the BODY are a sequence of forms to be evaluated as an
- implicit `progn'. Additional macros are available to the BODY, to make
- defining the class easier.
-
- In the following, NAME is a string giving a C identifier; NICK is a string
- giving the nickname of a superclass; TYPE is a C type using S-expression
- notation.
-
- * message NAME TYPE &rest PLIST
-
- * method NICK NAME TYPE BODY &rest PLIST
-
- * slot NAME TYPE &rest PLIST
-
- * instance-initializer NICK NAME VALUE-KIND VALUE-FORM &rest PLIST
-
- * class-initializer NICK NAME VALUE-KIND VALUE-FORM &rest PLIST"
-
- (let ((plist nil)
- (classvar (gensym "CLASS-")))
- (loop
- (when (or (null body)
- (not (keywordp (car body))))
- (return))
- (push (pop body) plist)
- (push (pop body) plist))
- `(let ((,classvar (make-sod-class ,name
- (mapcar #'find-sod-class
- (list ,@superclasses))
- (make-property-set
- ,@(nreverse plist)))))
- (macrolet ((message (name type &rest plist)
- `(make-sod-message ,',classvar ,name (c-type ,type)
- (make-property-set ,@plist)))
- (method (nick name type body &rest plist)
- `(make-sod-method ,',classvar ,nick ,name (c-type ,type)
- ,body (make-property-set ,@plist)))
- (slot (name type &rest plist)
- `(make-sod-slot ,',classvar ,name (c-type ,type)
- (make-property-set ,@plist)))
- (instance-initializer
- (nick name value-kind value-form &rest plist)
- `(make-sod-instance-initializer ,',classvar ,nick ,name
- ,value-kind ,value-form
- (make-property-set
- ,@plist)))
- (class-initializer
- (nick name value-kind value-form &rest plist)
- `(make-sod-class-initializer ,',classvar ,nick ,name
- ,value-kind ,value-form
- (make-property-set
- ,@plist))))
- ,@body
- (finalize-sod-class ,classvar)
- (add-to-module *module* ,classvar)))))
-
;;;----- That's all, folks --------------------------------------------------
~mdw / sod / blobdiff