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(in-package #:mulk.protocols)
(defvar *protocols* (make-hash-table))
(defun find-protocol (name &optional (errorp t))
(find-class name errorp))
(defun (setf find-protocol) (protocol name &optional errorp)
(declare (ignore errorp))
(setf (find-class name) protocol))
(defun protocol-name (protocol)
(class-name protocol))
(defun conforms-to-p (class protocol)
(let ((real-class (typecase class
(symbol (find-class class))
(t class)))
(real-protocol (typecase protocol
(symbol (find-protocol protocol))
(t protocol))))
(or (%conforms-to-p real-class real-protocol)
(some #'(lambda (superclass)
(conforms-to-p superclass real-protocol))
(class-direct-superclasses real-class)))))
(defun really-conforms-to-p (class protocol)
(let ((real-class (typecase class
(symbol (find-class class))
(t class)))
(real-protocol (typecase protocol
(symbol (find-protocol protocol))
(t protocol))))
(or (%really-conforms-to-p real-class real-protocol)
(some #'(lambda (superclass)
(really-conforms-to-p superclass real-protocol))
(class-direct-superclasses real-class)))))
(defgeneric %conforms-to-p (class protocol))
(defmethod %conforms-to-p ((class t) (protocol t))
(declare (ignore class protocol))
nil)
(defgeneric %really-conforms-to-p (class protocol))
(defmethod %really-conforms-to-p ((class t) (protocol t))
(declare (ignore class protocol))
nil)
(defclass protocol (standard-class)
((methods :initarg :methods
:reader protocol-methods)))
(defmethod validate-superclass (class (superclass protocol))
t)
(defmethod validate-superclass ((class standard-class) (superclass protocol))
t)
(defmacro define-protocol (name superprotocols methods &rest options)
"Define a new protocol.
superprotocols ::= (*name*\\*)
methods ::= ((method-name [\\* | class-name]\\*)\\*)"
`(defclass ,name ,(or superprotocols '(t))
()
(:metaclass protocol)
(:methods ,@methods)
,@options))
(defun ensure-conformance (class-name protocol-designator)
(let* ((protocol (typecase protocol-designator
(symbol (find-protocol protocol-designator))
(t protocol-designator)))
(protocol-name (protocol-name protocol))
(conforming-p nil))
(with-accessors ((name protocol-name)
(superprotocols class-direct-superclasses)
(methods protocol-methods))
protocol
(loop for method in methods
for (name . raw-argument-class-list) = method
for argument-class-list = (substitute class-name
'*
raw-argument-class-list)
for real-argument-class-list = (mapcar #'find-class
argument-class-list)
for (applicable-methods methods-determinable-p) =
(multiple-value-list
(funcall #'compute-applicable-methods-using-classes
(fdefinition name)
real-argument-class-list))
when (and methods-determinable-p (null applicable-methods))
collect method into missing-methods
and do (warn (make-condition 'simple-style-warning
:format-control "Class ~A does not ~
implement method ~A ~
with argument types ~
~A as required by ~
protocol ~A."
:format-arguments (list class-name
(first method)
real-argument-class-list
(protocol-name protocol))))
unless methods-determinable-p
do (warn (make-condition 'simple-style-warning
:format-control "Could not check whether ~
class ~A implements ~
method ~A with argument ~
types ~A as required by ~
protocol ~A. Assuming it ~
does."
:format-arguments (list class-name
(first method)
real-argument-class-list
(protocol-name protocol))))
finally (setq conforming-p (null missing-methods)))
(let ((really-conforming-p
(and conforming-p
(every #'identity
;; We have to use MAPCAR because we
;; don't want short-circuiting.
(mapcar #'(lambda (superprotocol)
(or (not (typep superprotocol 'protocol))
(ensure-conformance class-name
superprotocol)))
superprotocols)))))
(ensure-method #'%conforms-to-p
'(lambda (x y) t)
:specializers (list (intern-eql-specializer (find-class class-name))
(intern-eql-specializer (find-protocol protocol-name))))
(ensure-method #'%really-conforms-to-p
`(lambda (x y) ,really-conforming-p)
:specializers (list (intern-eql-specializer (find-class class-name))
(intern-eql-specializer (find-protocol protocol-name))))
(let ((original-class (find-class class-name)))
(unless (subtypep original-class protocol)
(let ((new-class-name (gensym (symbol-name class-name))))
(setf (class-name original-class) new-class-name)
(setf (find-class new-class-name) original-class)
(setf (find-class class-name)
(ensure-class
class-name
:direct-superclasses (list original-class protocol)
:metaclass (class-of original-class))))))))))
(defmacro implement-protocols (class protocols &body definitions)
`(progn
,@definitions
,@(mapcar #'(lambda (protocol)
`(ensure-conformance ',class ',protocol))
protocols)))
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