--- /dev/null
+(in-package "SPECIALIZABLE")
+
+;;;; CONS-SPECIALIZER example
+(defclass cons-specializer (extended-specializer)
+ ((car :initarg :car :reader %car)))
+(defclass cons-generic-function (specializable-generic-function)
+ ()
+ (:metaclass sb-mop:funcallable-standard-class))
+
+(define-extended-specializer cons (gf car)
+ (make-instance 'cons-specializer :car car))
+(defmethod sb-pcl:unparse-specializer-using-class
+ ((gf cons-generic-function) (specializer cons-specializer))
+ `(cons ,(%car specializer)))
+(defmethod sb-pcl::same-specializer-p
+ ((s1 cons-specializer) (s2 cons-specializer))
+ (eql (%car s1) (%car s2)))
+
+;;; FIXME: make a proper generalizer
+(defmethod generalizer-equal-hash-key ((gf cons-generic-function) (g symbol))
+ g)
+(defmethod generalizer-of-using-class ((gf cons-generic-function) arg)
+ (typecase arg
+ ((cons symbol) (car arg))
+ (t (call-next-method))))
+(defmethod specializer-accepts-generalizer-p ((gf cons-generic-function) (specializer cons-specializer) thing)
+ (if (eql (%car specializer) thing)
+ (values t t)
+ (values nil t)))
+(defmethod specializer-accepts-generalizer-p ((gf cons-generic-function) (specializer sb-mop:specializer) (thing symbol))
+ (specializer-accepts-generalizer-p gf specializer (find-class 'cons)))
+
+;;; note: this method operates in full knowledge of the object, and so
+;;; does not require the generic function as an argument.
+(defmethod specializer-accepts-p ((specializer cons-specializer) obj)
+ (and (consp obj)
+ (eql (car obj) (%car specializer))))
+
+(defmethod specializer< ((gf cons-generic-function) (s1 cons-specializer) (s2 cons-specializer) generalizer)
+ (declare (ignore generalizer))
+ (if (eql (%car s1) (%car s2))
+ '=
+ nil))
+(defmethod specializer< ((gf cons-generic-function) (s1 cons-specializer) (s2 class) generalizer)
+ (declare (ignore generalizer))
+ '<)
+(defmethod specializer< ((gf cons-generic-function) (s1 cons-specializer) (s2 sb-mop:eql-specializer) generalizer)
+ (declare (ignore generalizer))
+ '>)
+(defmethod specializer< ((gf cons-generic-function) (s1 sb-mop:specializer) (s2 cons-specializer) generalizer)
+ (ecase (specializer< gf s2 s1 generalizer)
+ ((<) '>)
+ ((>) '<)))
+;;; note: the need for this method is tricky: we need to translate
+;;; from generalizers that our specializers "know" about to those that
+;;; ordinary generic functions and specializers might know about.
+(defmethod specializer< ((gf cons-generic-function) (s1 sb-mop:specializer) (s2 sb-mop:specializer) (generalizer symbol))
+ (specializer< gf s1 s2 (find-class 'cons)))
+\f
+;;; tests / examples
+(eval
+ '(progn
+ (defgeneric walk (form)
+ (:generic-function-class cons-generic-function))
+ (defmethod walk ((form symbol))
+ `(lookup ,form))
+ (defmethod walk ((form cons))
+ `(call (flookup ,(car form)) (list ,@(mapcar #'walk (cdr form)))))
+ (defmethod walk ((form (cons quote)))
+ (cadr form))
+ (defmethod walk ((form (cons let)))
+ (let ((bindings (cadr form)))
+ `(with-bindings ,bindings ,@(mapcar #'walk (cddr form)))))
+
+ (assert (equal (walk t) '(lookup t)))
+ (assert (equal (walk nil) '(lookup nil)))
+ (assert (equal (walk '(foo bar)) '(call (flookup foo) (list (lookup bar)))))
+ (assert (equal (walk '(quote bar)) 'bar))
+ (assert (equal (walk '(let foo bar)) '(with-bindings foo (lookup bar))))))
+
+(eval
+ '(progn
+ (defgeneric multiple-class-specializers (x)
+ (:generic-function-class cons-generic-function)
+ (:method-combination list))
+ (defmethod multiple-class-specializers list ((x t)) 't)
+ (defmethod multiple-class-specializers list ((x cons)) 'cons)
+ (defmethod multiple-class-specializers list ((x (cons foo))) '(cons foo))
+ (defmethod multiple-class-specializers list ((x (cons bar))) '(cons bar))
+ (defmethod multiple-class-specializers list ((x list)) 'list)
+ (defmethod multiple-class-specializers list ((x null)) 'null)
+ (defmethod multiple-class-specializers list ((x (eql nil))) '(eql nil))
+
+ (assert (equal (multiple-class-specializers nil) '((eql nil) null list t)))
+ (assert (equal (multiple-class-specializers t) '(t)))
+ (assert (equal (multiple-class-specializers (cons nil nil)) '(cons list t)))
+ (assert (equal (multiple-class-specializers (cons 'foo nil)) '((cons foo) cons list t)))
+ (assert (equal (multiple-class-specializers (list 'bar nil t 3)) '((cons bar) cons list t)))))
+
+(eval
+ '(progn
+ (defgeneric keyword-args (x &key key1)
+ (:generic-function-class cons-generic-function))
+ (defmethod keyword-args ((x integer) &key key1 key2) (1+ x))
+ (defmethod keyword-args ((x float) &key key1 key3) (+ x 2.0))
+ (defmethod keyword-args :after ((x double-float) &key &allow-other-keys)
+ nil)
+ (assert (= (keyword-args 1) 2))
+ (assert (= (keyword-args 1 :key1 t) 2))
+ (assert (= (keyword-args 1 :key2 t) 2))
+ (assert (= (keyword-args 1 :key1 t :key2 t) 2))
+ (assert (nth-value 1 (ignore-errors (keyword-args 1 :key1 t :key3 t))))
+ (assert (nth-value 1 (ignore-errors (keyword-args 1 :key3 t))))
+ (assert (= (keyword-args 1 :key3 t :allow-other-keys t) 2))
+
+ (assert (= (keyword-args 1.0) 3.0))
+ (assert (= (keyword-args 1.0 :key1 t) 3.0))
+ (assert (= (keyword-args 1.0 :key3 t) 3.0))
+ (assert (= (keyword-args 1.0 :key1 t :key3 t) 3.0))
+ (assert (nth-value 1 (ignore-errors (keyword-args 1.0 :key1 t :key2 t))))
+ (assert (nth-value 1 (ignore-errors (keyword-args 1.0 :key2 t))))
+ (assert (= (keyword-args 1.0 :key2 t :allow-other-keys t) 3.0))
+
+ (assert (= (keyword-args 1.0d0) 3.0d0))
+ (assert (= (keyword-args 1.0d0 :key1 t) 3.0d0))
+ (assert (= (keyword-args 1.0d0 :key3 t) 3.0d0))
+ (assert (= (keyword-args 1.0d0 :key1 t :key3 t) 3.0d0))
+ (assert (= (keyword-args 1.0d0 :key1 t :key2 t) 3.0d0))
+ (assert (= (keyword-args 1.0d0 :key2 t) 3.0d0))
+ (assert (= (keyword-args 1.0d0 :key2 t :allow-other-keys t) 3.0d0))))
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