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526baa41 LMI |
1 | ;;; nnoo.el --- OO Gnus Backends |
2 | ;; Copyright (C) 1996 Free Software Foundation, Inc. | |
3 | ||
4 | ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no> | |
5 | ;; Keywords: news | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
28 | (eval-when-compile (require 'cl)) | |
29 | ||
30 | (defvar nnoo-definition-alist nil) | |
31 | (defvar nnoo-state-alist nil) | |
32 | ||
33 | (defmacro defvoo (var init &optional doc &rest map) | |
34 | "The same as `defvar', only takes list of variables to MAP to." | |
35 | `(prog1 | |
36 | ,(if doc | |
37 | `(defvar ,var ,init ,doc) | |
38 | `(defvar ,var ,init)) | |
39 | (nnoo-define ',var ',map))) | |
40 | (put 'defvoo 'lisp-indent-function 2) | |
41 | (put 'defvoo 'lisp-indent-hook 2) | |
42 | (put 'defvoo 'edebug-form-spec '(var init &optional doc &rest map)) | |
43 | ||
44 | (defmacro deffoo (func args &rest forms) | |
45 | "The same as `defun', only register FUNC." | |
46 | `(prog1 | |
47 | (defun ,func ,args ,@forms) | |
48 | (nnoo-register-function ',func))) | |
49 | (put 'deffoo 'lisp-indent-function 2) | |
50 | (put 'deffoo 'lisp-indent-hook 2) | |
51 | (put 'deffoo 'edebug-form-spec '(&define name lambda-list def-body)) | |
52 | ||
53 | (defun nnoo-register-function (func) | |
54 | (let ((funcs (nthcdr 3 (assoc (nnoo-backend func) | |
55 | nnoo-definition-alist)))) | |
56 | (unless funcs | |
57 | (error "%s belongs to a backend that hasn't been declared" func)) | |
58 | (setcar funcs (cons func (car funcs))))) | |
59 | ||
60 | (defmacro nnoo-declare (backend &rest parents) | |
61 | `(eval-and-compile | |
62 | (push (list ',backend | |
63 | (mapcar (lambda (p) (list p)) ',parents) | |
64 | nil nil) | |
65 | nnoo-definition-alist))) | |
66 | (put 'nnoo-declare 'lisp-indent-function 1) | |
67 | (put 'nnoo-declare 'lisp-indent-hook 1) | |
68 | ||
69 | (defun nnoo-parents (backend) | |
70 | (nth 1 (assoc backend nnoo-definition-alist))) | |
71 | ||
72 | (defun nnoo-variables (backend) | |
73 | (nth 2 (assoc backend nnoo-definition-alist))) | |
74 | ||
75 | (defun nnoo-functions (backend) | |
76 | (nth 3 (assoc backend nnoo-definition-alist))) | |
77 | ||
78 | (defmacro nnoo-import (backend &rest imports) | |
79 | `(nnoo-import-1 ',backend ',imports)) | |
80 | (put 'nnoo-import 'lisp-indent-function 1) | |
81 | (put 'nnoo-import 'lisp-indent-hook 1) | |
82 | ||
83 | (defun nnoo-import-1 (backend imports) | |
84 | (let ((call-function | |
85 | (if (symbolp (car imports)) (pop imports) 'nnoo-parent-function)) | |
86 | imp functions function) | |
87 | (while (setq imp (pop imports)) | |
88 | (setq functions | |
89 | (or (cdr imp) | |
90 | (nnoo-functions (car imp)))) | |
91 | (while functions | |
92 | (unless (fboundp (setq function | |
93 | (nnoo-symbol backend (nnoo-rest-symbol | |
94 | (car functions))))) | |
95 | (eval `(deffoo ,function (&rest args) | |
96 | (,call-function ',backend ',(car functions) args)))) | |
97 | (pop functions))))) | |
98 | ||
99 | (defun nnoo-parent-function (backend function args) | |
100 | (let* ((pbackend (nnoo-backend function))) | |
101 | (nnoo-change-server pbackend (nnoo-current-server backend) | |
102 | (cdr (assq pbackend (nnoo-parents backend)))) | |
103 | (apply function args))) | |
104 | ||
105 | (defun nnoo-execute (backend function &rest args) | |
106 | "Execute FUNCTION on behalf of BACKEND." | |
107 | (let* ((pbackend (nnoo-backend function))) | |
108 | (nnoo-change-server pbackend (nnoo-current-server backend) | |
109 | (cdr (assq pbackend (nnoo-parents backend)))) | |
110 | (apply function args))) | |
111 | ||
112 | (defmacro nnoo-map-functions (backend &rest maps) | |
113 | `(nnoo-map-functions-1 ',backend ',maps)) | |
114 | (put 'nnoo-map-functions 'lisp-indent-function 1) | |
115 | (put 'nnoo-map-functions 'lisp-indent-hook 1) | |
116 | ||
117 | (defun nnoo-map-functions-1 (backend maps) | |
118 | (let (m margs i) | |
119 | (while (setq m (pop maps)) | |
120 | (setq i 0 | |
121 | margs nil) | |
122 | (while (< i (length (cdr m))) | |
123 | (if (numberp (nth i (cdr m))) | |
124 | (push `(nth ,i args) margs) | |
125 | (push (nth i (cdr m)) margs)) | |
126 | (incf i)) | |
127 | (eval `(deffoo ,(nnoo-symbol backend (nnoo-rest-symbol (car m))) | |
128 | (&rest args) | |
129 | (nnoo-parent-function ',backend ',(car m) | |
130 | ,(cons 'list (nreverse margs)))))))) | |
131 | ||
132 | (defun nnoo-backend (symbol) | |
133 | (string-match "^[^-]+-" (symbol-name symbol)) | |
134 | (intern (substring (symbol-name symbol) 0 (1- (match-end 0))))) | |
135 | ||
136 | (defun nnoo-rest-symbol (symbol) | |
137 | (string-match "^[^-]+-" (symbol-name symbol)) | |
138 | (intern (substring (symbol-name symbol) (match-end 0)))) | |
139 | ||
140 | (defun nnoo-symbol (backend symbol) | |
141 | (intern (format "%s-%s" backend symbol))) | |
142 | ||
143 | (defun nnoo-define (var map) | |
144 | (let* ((backend (nnoo-backend var)) | |
145 | (def (assq backend nnoo-definition-alist)) | |
146 | (parents (nth 1 def))) | |
147 | (unless def | |
148 | (error "%s belongs to a backend that hasn't been declared." var)) | |
149 | (setcar (nthcdr 2 def) | |
150 | (delq (assq var (nth 2 def)) (nth 2 def))) | |
151 | (setcar (nthcdr 2 def) | |
152 | (cons (cons var (symbol-value var)) | |
153 | (nth 2 def))) | |
154 | (while map | |
155 | (nconc (assq (nnoo-backend (car map)) parents) | |
156 | (list (list (pop map) var)))))) | |
157 | ||
158 | (defun nnoo-change-server (backend server defs) | |
159 | (let* ((bstate (cdr (assq backend nnoo-state-alist))) | |
160 | (sdefs (assq backend nnoo-definition-alist)) | |
161 | (current (car bstate)) | |
162 | (parents (nnoo-parents backend)) | |
163 | state) | |
164 | (unless bstate | |
165 | (push (setq bstate (list backend nil)) | |
166 | nnoo-state-alist) | |
167 | (pop bstate)) | |
168 | (if (equal server current) | |
169 | t | |
170 | (nnoo-push-server backend current) | |
171 | (setq state (or (cdr (assoc server (cddr bstate))) | |
172 | (nnoo-variables backend))) | |
173 | (while state | |
174 | (set (caar state) (cdar state)) | |
175 | (pop state)) | |
176 | (setcar bstate server) | |
177 | (unless (cdr (assoc server (cddr bstate))) | |
178 | (while defs | |
179 | (set (caar defs) (cadar defs)) | |
180 | (pop defs))) | |
181 | (while parents | |
182 | (nnoo-change-server | |
183 | (caar parents) server | |
184 | (mapcar (lambda (def) (list (car def) (symbol-value (cadr def)))) | |
185 | (cdar parents))) | |
186 | (pop parents)))) | |
187 | t) | |
188 | ||
189 | (defun nnoo-push-server (backend current) | |
190 | (let ((bstate (assq backend nnoo-state-alist)) | |
191 | (defs (nnoo-variables backend))) | |
192 | ;; Remove the old definition. | |
193 | (setcdr (cdr bstate) (delq (assoc current (cddr bstate)) (cddr bstate))) | |
194 | (let (state) | |
195 | (while defs | |
196 | (push (cons (caar defs) (symbol-value (caar defs))) | |
197 | state) | |
198 | (pop defs)) | |
199 | (nconc bstate (list (cons current state)))))) | |
200 | ||
201 | (defun nnoo-current-server-p (backend server) | |
202 | (equal (nnoo-current-server backend) server)) | |
203 | ||
204 | (defun nnoo-current-server (backend) | |
205 | (nth 1 (assq backend nnoo-state-alist))) | |
206 | ||
207 | (defun nnoo-close-server (backend &optional server) | |
208 | (unless server | |
209 | (setq server (nnoo-current-server backend))) | |
210 | (when server | |
211 | (let* ((bstate (cdr (assq backend nnoo-state-alist))) | |
212 | (defs (assoc server (cdr bstate)))) | |
213 | (when bstate | |
214 | (setcar bstate nil) | |
215 | (setcdr bstate (delq defs (cdr bstate))) | |
216 | (pop defs) | |
217 | (while defs | |
218 | (set (car (pop defs)) nil))))) | |
219 | t) | |
220 | ||
221 | (defun nnoo-close (backend) | |
222 | (setq nnoo-state-alist | |
223 | (delq (assq backend nnoo-state-alist) | |
224 | nnoo-state-alist)) | |
225 | t) | |
226 | ||
227 | (defun nnoo-status-message (backend server) | |
228 | (nnheader-get-report backend)) | |
229 | ||
230 | (defun nnoo-server-opened (backend server) | |
231 | (and (nnoo-current-server-p backend server) | |
232 | nntp-server-buffer | |
233 | (buffer-name nntp-server-buffer))) | |
234 | ||
235 | (defmacro nnoo-define-basics (backend) | |
236 | `(eval-and-compile | |
237 | (nnoo-define-basics-1 ',backend))) | |
238 | ||
239 | (defun nnoo-define-basics-1 (backend) | |
240 | (let ((functions '(close-server server-opened status-message))) | |
241 | (while functions | |
242 | (eval `(deffoo ,(nnoo-symbol backend (car functions)) | |
243 | (&optional server) | |
244 | (,(nnoo-symbol 'nnoo (pop functions)) ',backend server))))) | |
245 | (eval `(deffoo ,(nnoo-symbol backend 'open-server) | |
246 | (server &optional defs) | |
247 | (nnoo-change-server ',backend server defs)))) | |
248 | ||
249 | (provide 'nnoo) | |
250 | ||
251 | ;;; nnoo.el ends here. |