1 ;;; gnus-logic.el --- advanced scoring code for Gnus
2 ;; Copyright (C) 1996 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
7 ;; This file is part of GNU Emacs.
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)
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.
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.
30 ;(require 'parse-time)
33 ;;; Internal variables.
35 (defvar gnus-advanced-headers nil)
37 ;; To avoid having 8-bit charaters in the source file.
38 (defvar gnus-advanced-not (intern (format "%c" 172)))
40 (defconst gnus-advanced-index
41 ;; Name to index alist.
42 '(("number" 0 gnus-advanced-integer)
43 ("subject" 1 gnus-advanced-string)
44 ("from" 2 gnus-advanced-string)
45 ("date" 3 gnus-advanced-date)
46 ("message-id" 4 gnus-advanced-string)
47 ("references" 5 gnus-advanced-string)
48 ("chars" 6 gnus-advanced-integer)
49 ("lines" 7 gnus-advanced-integer)
50 ("xref" 8 gnus-advanced-string)
51 ("head" nil gnus-advanced-body)
52 ("body" nil gnus-advanced-body)
53 ("all" nil gnus-advanced-body)))
55 (defun gnus-score-advanced (rule &optional trace)
56 "Apply advanced scoring RULE to all the articles in the current group."
57 (let ((headers gnus-newsgroup-headers)
58 gnus-advanced-headers score)
59 (while (setq gnus-advanced-headers (pop headers))
60 (when (gnus-advanced-score-rule (car rule))
61 ;; This rule was successful, so we add the score to
63 (if (setq score (assq (mail-header-number gnus-advanced-headers)
64 gnus-newsgroup-scored))
68 gnus-score-interactive-default-score)))
69 (push (cons (mail-header-number gnus-advanced-headers)
71 gnus-score-interactive-default-score))
72 gnus-newsgroup-scored)
74 (push (cons "A file" rule)
75 gnus-score-trace)))))))
77 (defun gnus-advanced-score-rule (rule)
78 "Apply RULE to `gnus-advanced-headers'."
79 (let ((type (car rule)))
82 ((or (eq type '&) (eq type 'and))
85 t ; Empty rule is true.
87 (gnus-advanced-score-rule (pop rule))))
88 ;; If all the rules were true, then `rule' should be nil.
91 ((or (eq type '|) (eq type 'or))
96 (not (gnus-advanced-score-rule (car rule))))
98 ;; If one of the rules returned true, then `rule' should be non-nil.
101 ((or (eq type '!) (eq type 'not) (eq type gnus-advanced-not))
102 (not (gnus-advanced-score-rule (nth 1 rule))))
103 ;; This is a `1-'-type redirection rule.
105 (string-match "^[0-9]+-$\\|^\\^+$" (symbol-name type)))
106 (let ((gnus-advanced-headers
108 gnus-advanced-headers
109 (if (string-match "^\\([0-9]+\\)-$" (symbol-name type))
110 ;; 1- type redirection.
112 (substring (symbol-name type)
113 (match-beginning 0) (match-end 0)))
114 ;; ^^^ type redirection.
115 (length (symbol-name type))))))
116 (when gnus-advanced-headers
117 (gnus-advanced-score-rule (nth 1 rule)))))
118 ;; Plain scoring rule.
120 (gnus-advanced-score-article rule))
123 (error "Unknown advanced score type: %s" rule)))))
125 (defun gnus-advanced-score-article (rule)
126 ;; `rule' is a semi-normal score rule, so we find out
127 ;; what function that's supposed to do the actual
129 (let* ((header (car rule))
130 (func (assoc (downcase header) gnus-advanced-index)))
132 (error "No such header: %s" rule)
133 ;; Call the score function.
134 (funcall (caddr func) (or (cadr func) header)
135 (cadr rule) (caddr rule)))))
137 (defun gnus-advanced-string (index match type)
138 "See whether string MATCH of TYPE matches `gnus-advanced-headers' in INDEX."
139 (let* ((type (or type 's))
140 (case-fold-search (not (eq (downcase (symbol-name type))
141 (symbol-name type))))
142 (header (aref gnus-advanced-headers index)))
144 ((memq type '(r R regexp Regexp))
145 (string-match match header))
146 ((memq type '(s S string String))
147 (string-match (regexp-quote match) header))
148 ((memq type '(e E exact Exact))
149 (string= match header))
150 ((memq type '(f F fuzzy Fuzzy))
151 (string-match (regexp-quote (gnus-simplify-subject-fuzzy match))
154 (error "No such string match type: %s" type)))))
156 (defun gnus-advanced-integer (index match type)
157 (if (not (memq type '(< > <= >= =)))
158 (error "No such integer score type: %s" type)
159 (funcall type match (or (aref gnus-advanced-headers index) 0))))
161 (defun gnus-advanced-date (index match type)
162 (let ((date (encode-time (parse-time-string
163 (aref gnus-advanced-headers index))))
164 (match (encode-time (parse-time-string match))))
169 (gnus-time-less match date))
171 (gnus-time-less date match))
173 (error "No such date score type: %s" type)))))
175 (defun gnus-advanced-body (header match type)
176 (when (string= header "all")
177 (setq header "article"))
179 (set-buffer nntp-server-buffer)
180 (let* ((request-func (cond ((string= "head" header)
182 ((string= "body" header)
184 (t 'gnus-request-article)))
186 ;; Not all backends support partial fetching. In that case,
187 ;; we just fetch the entire article.
188 (unless (gnus-check-backend-function
189 (intern (concat "request-" header))
191 (setq ofunc request-func)
192 (setq request-func 'gnus-request-article))
193 (setq article (mail-header-number gnus-advanced-headers))
194 (gnus-message 7 "Scoring article %s..." article)
195 (when (funcall request-func article gnus-newsgroup-name)
196 (goto-char (point-min))
197 ;; If just parts of the article is to be searched and the
198 ;; backend didn't support partial fetching, we just narrow
199 ;; to the relevant parts.
201 (if (eq ofunc 'gnus-request-head)
204 (or (search-forward "\n\n" nil t) (point-max)))
206 (or (search-forward "\n\n" nil t) (point))
208 (let* ((case-fold-search (not (eq (downcase (symbol-name type))
209 (symbol-name type))))
211 (cond ((memq type '(r R regexp Regexp))
213 ((memq type '(s S string String))
216 (error "Illegal match type: %s" type)))))
217 (goto-char (point-min))
219 (funcall search-func match nil t)
222 (provide 'gnus-logic)
224 ;;; gnus-logic.el ends here.