--- /dev/null
+;;; luna.el --- tiny OOP system kernel
+
+;; Copyright (C) 1999 Electrotechnical Laboratory, JAPAN.
+;; Licensed to the Free Software Foundation.
+
+;; Author: MORIOKA Tomohiko <tomo@m17n.org>
+;; Keywords: OOP
+
+;; This file is part of FLIM (Faithful Library about Internet Message).
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 2, or (at
+;; your option) any later version.
+
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+(eval-when-compile (require 'static))
+
+(static-condition-case nil
+ :symbol-for-testing-whether-colon-keyword-is-available-or-not
+ (void-variable
+ (defconst :before ':before)
+ (defconst :after ':after)
+ (defconst :around ':around)))
+
+(defmacro luna-find-class (name)
+ "Return the luna-class of the given NAME."
+ `(get ,name 'luna-class))
+
+(defmacro luna-set-class (name class)
+ `(put ,name 'luna-class ,class))
+
+(defmacro luna-class-obarray (class)
+ `(aref ,class 1))
+
+(defmacro luna-class-parents (class)
+ `(aref ,class 2))
+
+(defmacro luna-class-number-of-slots (class)
+ `(aref ,class 3))
+
+(defmacro luna-define-class (type &optional parents slots)
+ "Define TYPE as a luna-class.
+If PARENTS is specified, TYPE inherits PARENTS.
+Each parent must be name of luna-class (symbol).
+If SLOTS is specified, TYPE will be defined to have them."
+ `(luna-define-class-function ',type ',(append parents '(standard-object))
+ ',slots))
+
+(defun luna-define-class-function (type &optional parents slots)
+ (static-condition-case nil
+ :symbol-for-testing-whether-colon-keyword-is-available-or-not
+ (void-variable
+ (let (key)
+ (dolist (slot slots)
+ (setq key (intern (format ":%s" slot)))
+ (set key key)))))
+ (let ((oa (make-vector 31 0))
+ (rest parents)
+ parent name
+ (i 2)
+ b j)
+ (while rest
+ (setq parent (pop rest)
+ b (- i 2))
+ (mapatoms (lambda (sym)
+ (when (setq j (get sym 'luna-slot-index))
+ (setq name (symbol-name sym))
+ (unless (intern-soft name oa)
+ (put (intern name oa) 'luna-slot-index (+ j b))
+ (setq i (1+ i))
+ )))
+ (luna-class-obarray (luna-find-class parent)))
+ )
+ (setq rest slots)
+ (while rest
+ (setq name (symbol-name (pop rest)))
+ (unless (intern-soft name oa)
+ (put (intern name oa) 'luna-slot-index i)
+ (setq i (1+ i))
+ ))
+ (luna-set-class type (vector 'class oa parents i))
+ ))
+
+(defun luna-class-find-member (class member-name)
+ (or (stringp member-name)
+ (setq member-name (symbol-name member-name)))
+ (or (intern-soft member-name (luna-class-obarray class))
+ (let ((parents (luna-class-parents class))
+ ret)
+ (while (and parents
+ (null
+ (setq ret (luna-class-find-member
+ (luna-find-class (pop parents))
+ member-name)))))
+ ret)))
+
+(defsubst luna-class-find-or-make-member (class member-name)
+ (or (stringp member-name)
+ (setq member-name (symbol-name member-name)))
+ (intern member-name (luna-class-obarray class)))
+
+(defmacro luna-class-slot-index (class slot-name)
+ `(get (luna-class-find-member ,class ,slot-name) 'luna-slot-index))
+
+(defmacro luna-slot-index (entity slot-name)
+ `(luna-class-slot-index (luna-find-class (luna-class-name ,entity))
+ ,slot-name))
+
+(defsubst luna-slot-value (entity slot)
+ "Return the value of SLOT of ENTITY."
+ (aref entity (luna-slot-index entity slot)))
+
+(defsubst luna-set-slot-value (entity slot value)
+ "Store VALUE into SLOT of ENTITY."
+ (aset entity (luna-slot-index entity slot) value))
+
+(defmacro luna-define-method (name &rest definition)
+ "Define NAME as a method function of a class.
+
+Usage of this macro follows:
+
+ (luna-define-method NAME [METHOD-QUALIFIER] ARGLIST [DOCSTRING] BODY...)
+
+NAME is the name of method.
+
+Optional argument METHOD-QUALIFIER must be :before, :after or :around.
+If it is :before / :after, the method is called before / after a
+method of parent class is finished. ARGLIST is like an argument list
+of lambda, but (car ARGLIST) must be specialized parameter. (car (car
+ARGLIST)) is name of variable and \(nth 1 (car ARGLIST)) is name of
+class.
+
+Optional argument DOCSTRING is the documentation of method.
+
+BODY is the body of method."
+ (let ((method-qualifier (pop definition))
+ args specializer class self)
+ (if (memq method-qualifier '(:before :after :around))
+ (setq args (pop definition))
+ (setq args method-qualifier
+ method-qualifier nil)
+ )
+ (setq specializer (car args)
+ class (nth 1 specializer)
+ self (car specializer))
+ `(let ((func (lambda ,(if self
+ (cons self (cdr args))
+ (cdr args))
+ ,@definition))
+ (sym (luna-class-find-or-make-member
+ (luna-find-class ',class) ',name)))
+ (fset sym func)
+ (put sym 'luna-method-qualifier ,method-qualifier)
+ )))
+
+(put 'luna-define-method 'lisp-indent-function 'defun)
+
+(def-edebug-spec luna-define-method
+ (&define name [&optional &or ":before" ":after" ":around"]
+ ((arg symbolp)
+ [&rest arg]
+ [&optional ["&optional" arg &rest arg]]
+ &optional ["&rest" arg]
+ )
+ def-body))
+
+(defun luna-class-find-parents-functions (class service)
+ (let ((parents (luna-class-parents class))
+ ret)
+ (while (and parents
+ (null
+ (setq ret (luna-class-find-functions
+ (luna-find-class (pop parents))
+ service)))))
+ ret))
+
+(defun luna-class-find-functions (class service)
+ (let ((sym (luna-class-find-member class service)))
+ (if (fboundp sym)
+ (cond ((eq (get sym 'luna-method-qualifier) :before)
+ (cons (symbol-function sym)
+ (luna-class-find-parents-functions class service))
+ )
+ ((eq (get sym 'luna-method-qualifier) :after)
+ (nconc (luna-class-find-parents-functions class service)
+ (list (symbol-function sym)))
+ )
+ ((eq (get sym 'luna-method-qualifier) :around)
+ (cons sym (luna-class-find-parents-functions class service))
+ )
+ (t
+ (list (symbol-function sym))
+ ))
+ (luna-class-find-parents-functions class service)
+ )))
+
+(defmacro luna-find-functions (entity service)
+ `(luna-class-find-functions (luna-find-class (luna-class-name ,entity))
+ ,service))
+
+(defsubst luna-send (entity message &rest luna-current-method-arguments)
+ "Send MESSAGE to ENTITY, and return the result.
+LUNA-CURRENT-METHOD-ARGUMENTS is arguments of the MESSAGE."
+ (let ((luna-next-methods (luna-find-functions entity message))
+ luna-current-method
+ luna-previous-return-value)
+ (while (and luna-next-methods
+ (progn
+ (setq luna-current-method (pop luna-next-methods)
+ luna-previous-return-value
+ (apply luna-current-method
+ luna-current-method-arguments))
+ (if (symbolp luna-current-method)
+ (not (eq (get luna-current-method
+ 'luna-method-qualifier) :around))
+ t))))
+ luna-previous-return-value))
+
+(eval-when-compile
+ (defvar luna-next-methods nil)
+ (defvar luna-current-method-arguments nil)
+ )
+
+(defun luna-call-next-method ()
+ "Call the next method in a method with :around qualifier."
+ (let (luna-current-method
+ luna-previous-return-value)
+ (while (and luna-next-methods
+ (progn
+ (setq luna-current-method (pop luna-next-methods)
+ luna-previous-return-value
+ (apply luna-current-method
+ luna-current-method-arguments))
+ (if (symbolp luna-current-method)
+ (not (eq (get luna-current-method
+ 'luna-method-qualifier) :around))
+ t))))
+ luna-previous-return-value))
+
+(defmacro luna-class-name (entity)
+ "Return class-name of the ENTITY."
+ `(aref ,entity 0))
+
+(defmacro luna-set-class-name (entity name)
+ `(aset ,entity 0 ,name))
+
+(defmacro luna-get-obarray (entity)
+ `(aref ,entity 1))
+
+(defmacro luna-set-obarray (entity obarray)
+ `(aset ,entity 1 ,obarray))
+
+(defun luna-make-entity (type &rest init-args)
+ "Make instance of luna-class TYPE and return it.
+If INIT-ARGS is specified, it is used as initial values of the slots.
+It must be plist and each slot name must have prefix `:'."
+ (let* ((c (get type 'luna-class))
+ (v (make-vector (luna-class-number-of-slots c) nil)))
+ (luna-set-class-name v type)
+ (luna-set-obarray v (make-vector 7 0))
+ (apply #'luna-send v 'initialize-instance v init-args)
+ ))
+
+(defsubst luna-arglist-to-arguments (arglist)
+ (let (dest)
+ (while arglist
+ (let ((arg (car arglist)))
+ (or (memq arg '(&optional &rest))
+ (setq dest (cons arg dest)))
+ )
+ (setq arglist (cdr arglist)))
+ (nreverse dest)))
+
+(defmacro luna-define-generic (name args &optional doc)
+ "Define generic-function NAME.
+ARGS is argument of and DOC is DOC-string."
+ (if doc
+ `(defun ,(intern (symbol-name name)) ,args
+ ,doc
+ (luna-send ,(car args) ',name
+ ,@(luna-arglist-to-arguments args))
+ )
+ `(defun ,(intern (symbol-name name)) ,args
+ (luna-send ,(car args) ',name
+ ,@(luna-arglist-to-arguments args))
+ )))
+
+(put 'luna-define-generic 'lisp-indent-function 'defun)
+
+(defun luna-define-internal-accessors (class-name)
+ "Define internal accessors for an entity of CLASS-NAME."
+ (let ((entity-class (luna-find-class class-name))
+ parents parent-class)
+ (mapatoms
+ (lambda (slot)
+ (if (luna-class-slot-index entity-class slot)
+ (catch 'derived
+ (setq parents (luna-class-parents entity-class))
+ (while parents
+ (setq parent-class (luna-find-class (car parents)))
+ (if (luna-class-slot-index parent-class slot)
+ (throw 'derived nil))
+ (setq parents (cdr parents))
+ )
+ (eval
+ `(progn
+ (defmacro ,(intern (format "%s-%s-internal"
+ class-name slot))
+ (entity)
+ (list 'aref entity
+ ,(luna-class-slot-index entity-class
+ (intern (symbol-name slot)))
+ ))
+ (defmacro ,(intern (format "%s-set-%s-internal"
+ class-name slot))
+ (entity value)
+ (list 'aset entity
+ ,(luna-class-slot-index
+ entity-class (intern (symbol-name slot)))
+ value))
+ ))
+ )))
+ (luna-class-obarray entity-class))))
+
+(luna-define-class-function 'standard-object)
+
+(luna-define-method initialize-instance ((entity standard-object)
+ &rest init-args)
+ (let* ((c (luna-find-class (luna-class-name entity)))
+ (oa (luna-class-obarray c))
+ s i)
+ (while init-args
+ (setq s (intern-soft (substring (symbol-name (pop init-args)) 1) oa)
+ i (pop init-args))
+ (if s
+ (aset entity (get s 'luna-slot-index) i)
+ ))
+ entity))
+
+
+;;; @ end
+;;;
+
+(provide 'luna)
+
+;; luna.el ends here
projects / elisp / flim.git / blobdiff