;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
-;; Version: $Id: mime-def.el,v 0.38 1997-03-03 16:57:09 morioka Exp $
+;; Version: $Id: mime-def.el,v 0.39 1997-03-03 17:25:51 morioka Exp $
;; Keywords: definition, MIME, multimedia, mail, news
;; This file is part of SEMI (SEMI is Emacs MIME Interfaces).
;;; @ method selector kernel
;;;
+(require 'atype)
+
;;; @@ field unifier
;;;
-(defun field-unifier-for-default (a b)
- (let ((ret
- (cond ((equal a b) a)
- ((null (cdr b)) a)
- ((null (cdr a)) b)
- )))
- (if ret
- (list nil ret nil)
- )))
-
(defun field-unifier-for-mode (a b)
(let ((va (cdr a)))
(if (if (consp va)
(list nil b nil)
)))
-(defun field-unify (a b)
- (let ((sym (intern (concat "field-unifier-for-" (symbol-name (car a))))))
- (or (fboundp sym)
- (setq sym (function field-unifier-for-default))
- )
- (funcall sym a b)
- ))
-
-
-;;; @@ type unifier
-;;;
-
-(defun assoc-unify (class instance)
- (catch 'tag
- (let ((cla (copy-alist class))
- (ins (copy-alist instance))
- (r class)
- cell aret ret prev rest)
- (while r
- (setq cell (car r))
- (setq aret (assoc (car cell) ins))
- (if aret
- (if (setq ret (field-unify cell aret))
- (progn
- (if (car ret)
- (setq prev (put-alist (car (car ret))
- (cdr (car ret))
- prev))
- )
- (if (nth 2 ret)
- (setq rest (put-alist (car (nth 2 ret))
- (cdr (nth 2 ret))
- rest))
- )
- (setq cla (put-alist (car cell)(cdr (nth 1 ret)) cla))
- (setq ins (del-alist (car cell) ins))
- )
- (throw 'tag nil)
- ))
- (setq r (cdr r))
- )
- (setq r (copy-alist ins))
- (while r
- (setq cell (car r))
- (setq aret (assoc (car cell) cla))
- (if aret
- (if (setq ret (field-unify cell aret))
- (progn
- (if (car ret)
- (setq prev (put-alist (car (car ret))
- (cdr (car ret))
- prev))
- )
- (if (nth 2 ret)
- (setq rest (put-alist (car (nth 2 ret))
- (cdr (nth 2 ret))
- rest))
- )
- (setq cla (del-alist (car cell) cla))
- (setq ins (put-alist (car cell)(cdr (nth 1 ret)) ins))
- )
- (throw 'tag nil)
- ))
- (setq r (cdr r))
- )
- (list prev (append cla ins) rest)
- )))
-
-(defun get-unified-alist (db al)
- (let ((r db) ret)
- (catch 'tag
- (while r
- (if (setq ret (nth 1 (assoc-unify (car r) al)))
- (throw 'tag ret)
- )
- (setq r (cdr r))
- ))))
-
-(defun delete-atype (atl al)
- (let* ((r atl) ret oal)
- (setq oal
- (catch 'tag
- (while r
- (if (setq ret (nth 1 (assoc-unify (car r) al)))
- (throw 'tag (car r))
- )
- (setq r (cdr r))
- )))
- (delete oal atl)
- ))
-
-(defun remove-atype (sym al)
- (and (boundp sym)
- (set sym (delete-atype (eval sym) al))
- ))
-
-(defun replace-atype (atl old-al new-al)
- (let* ((r atl) ret oal)
- (if (catch 'tag
- (while r
- (if (setq ret (nth 1 (assoc-unify (car r) old-al)))
- (throw 'tag (rplaca r new-al))
- )
- (setq r (cdr r))
- ))
- atl)))
-
-(defun set-atype (sym al &rest options)
- (if (null (boundp sym))
- (set sym al)
- (let* ((replacement (memq 'replacement options))
- (ignore-fields (car (cdr (memq 'ignore options))))
- (remove (or (car (cdr (memq 'remove options)))
- (let ((ral (copy-alist al)))
- (mapcar (function
- (lambda (type)
- (setq ral (del-alist type ral))
- ))
- ignore-fields)
- ral)))
- )
- (set sym
- (or (if replacement
- (replace-atype (eval sym) remove al)
- )
- (cons al
- (delete-atype (eval sym) remove)
- )
- )))))
-
;;; @ rot13-47
;;;