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date Mon, 13 Aug 2007 08:49:20 +0200
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15:ad457d5f7d04 16:0293115a14e9
1 ;;; gnus-logic.el --- advanced scoring code for Gnus
2 ;; Copyright (C) 1996,97 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 (require 'gnus)
29 (require 'gnus-score)
30 (require 'gnus-util)
31
32 ;;; Internal variables.
33
34 (defvar gnus-advanced-headers nil)
35
36 ;; To avoid having 8-bit characters in the source file.
37 (defvar gnus-advanced-not (intern (format "%c" 172)))
38
39 (defconst gnus-advanced-index
40 ;; Name to index alist.
41 '(("number" 0 gnus-advanced-integer)
42 ("subject" 1 gnus-advanced-string)
43 ("from" 2 gnus-advanced-string)
44 ("date" 3 gnus-advanced-date)
45 ("message-id" 4 gnus-advanced-string)
46 ("references" 5 gnus-advanced-string)
47 ("chars" 6 gnus-advanced-integer)
48 ("lines" 7 gnus-advanced-integer)
49 ("xref" 8 gnus-advanced-string)
50 ("head" nil gnus-advanced-body)
51 ("body" nil gnus-advanced-body)
52 ("all" nil gnus-advanced-body)))
53
54 (eval-and-compile
55 (autoload 'parse-time-string "parse-time"))
56
57 (defun gnus-score-advanced (rule &optional trace)
58 "Apply advanced scoring RULE to all the articles in the current group."
59 (let ((headers gnus-newsgroup-headers)
60 gnus-advanced-headers score)
61 (while (setq gnus-advanced-headers (pop headers))
62 (when (gnus-advanced-score-rule (car rule))
63 ;; This rule was successful, so we add the score to
64 ;; this article.
65 (if (setq score (assq (mail-header-number gnus-advanced-headers)
66 gnus-newsgroup-scored))
67 (setcdr score
68 (+ (cdr score)
69 (or (nth 1 rule)
70 gnus-score-interactive-default-score)))
71 (push (cons (mail-header-number gnus-advanced-headers)
72 (or (nth 1 rule)
73 gnus-score-interactive-default-score))
74 gnus-newsgroup-scored)
75 (when trace
76 (push (cons "A file" rule)
77 gnus-score-trace)))))))
78
79 (defun gnus-advanced-score-rule (rule)
80 "Apply RULE to `gnus-advanced-headers'."
81 (let ((type (car rule)))
82 (cond
83 ;; "And" rule.
84 ((or (eq type '&) (eq type 'and))
85 (pop rule)
86 (if (not rule)
87 t ; Empty rule is true.
88 (while (and rule
89 (gnus-advanced-score-rule (car rule)))
90 (pop rule))
91 ;; If all the rules were true, then `rule' should be nil.
92 (not rule)))
93 ;; "Or" rule.
94 ((or (eq type '|) (eq type 'or))
95 (pop rule)
96 (if (not rule)
97 nil
98 (while (and rule
99 (not (gnus-advanced-score-rule (car rule))))
100 (pop rule))
101 ;; If one of the rules returned true, then `rule' should be non-nil.
102 rule))
103 ;; "Not" rule.
104 ((or (eq type '!) (eq type 'not) (eq type gnus-advanced-not))
105 (not (gnus-advanced-score-rule (nth 1 rule))))
106 ;; This is a `1-'-type redirection rule.
107 ((and (symbolp type)
108 (string-match "^[0-9]+-$\\|^\\^+$" (symbol-name type)))
109 (let ((gnus-advanced-headers
110 (gnus-parent-headers
111 gnus-advanced-headers
112 (if (string-match "^\\([0-9]+\\)-$" (symbol-name type))
113 ;; 1- type redirection.
114 (string-to-number
115 (substring (symbol-name type)
116 (match-beginning 0) (match-end 0)))
117 ;; ^^^ type redirection.
118 (length (symbol-name type))))))
119 (when gnus-advanced-headers
120 (gnus-advanced-score-rule (nth 1 rule)))))
121 ;; Plain scoring rule.
122 ((stringp type)
123 (gnus-advanced-score-article rule))
124 ;; Bug-out time!
125 (t
126 (error "Unknown advanced score type: %s" rule)))))
127
128 (defun gnus-advanced-score-article (rule)
129 ;; `rule' is a semi-normal score rule, so we find out
130 ;; what function that's supposed to do the actual
131 ;; processing.
132 (let* ((header (car rule))
133 (func (assoc (downcase header) gnus-advanced-index)))
134 (if (not func)
135 (error "No such header: %s" rule)
136 ;; Call the score function.
137 (funcall (caddr func) (or (cadr func) header)
138 (cadr rule) (caddr rule)))))
139
140 (defun gnus-advanced-string (index match type)
141 "See whether string MATCH of TYPE matches `gnus-advanced-headers' in INDEX."
142 (let* ((type (or type 's))
143 (case-fold-search (not (eq (downcase (symbol-name type))
144 (symbol-name type))))
145 (header (aref gnus-advanced-headers index)))
146 (cond
147 ((memq type '(r R regexp Regexp))
148 (string-match match header))
149 ((memq type '(s S string String))
150 (string-match (regexp-quote match) header))
151 ((memq type '(e E exact Exact))
152 (string= match header))
153 ((memq type '(f F fuzzy Fuzzy))
154 (string-match (regexp-quote (gnus-simplify-subject-fuzzy match))
155 header))
156 (t
157 (error "No such string match type: %s" type)))))
158
159 (defun gnus-advanced-integer (index match type)
160 (if (not (memq type '(< > <= >= =)))
161 (error "No such integer score type: %s" type)
162 (funcall type match (or (aref gnus-advanced-headers index) 0))))
163
164 (defun gnus-advanced-date (index match type)
165 (let ((date (encode-time (parse-time-string
166 (aref gnus-advanced-headers index))))
167 (match (encode-time (parse-time-string match))))
168 (cond
169 ((eq type 'at)
170 (equal date match))
171 ((eq type 'before)
172 (gnus-time-less match date))
173 ((eq type 'after)
174 (gnus-time-less date match))
175 (t
176 (error "No such date score type: %s" type)))))
177
178 (defun gnus-advanced-body (header match type)
179 (when (string= header "all")
180 (setq header "article"))
181 (save-excursion
182 (set-buffer nntp-server-buffer)
183 (let* ((request-func (cond ((string= "head" header)
184 'gnus-request-head)
185 ((string= "body" header)
186 'gnus-request-body)
187 (t 'gnus-request-article)))
188 ofunc article)
189 ;; Not all backends support partial fetching. In that case,
190 ;; we just fetch the entire article.
191 (unless (gnus-check-backend-function
192 (intern (concat "request-" header))
193 gnus-newsgroup-name)
194 (setq ofunc request-func)
195 (setq request-func 'gnus-request-article))
196 (setq article (mail-header-number gnus-advanced-headers))
197 (gnus-message 7 "Scoring article %s..." article)
198 (when (funcall request-func article gnus-newsgroup-name)
199 (goto-char (point-min))
200 ;; If just parts of the article is to be searched and the
201 ;; backend didn't support partial fetching, we just narrow
202 ;; to the relevant parts.
203 (when ofunc
204 (if (eq ofunc 'gnus-request-head)
205 (narrow-to-region
206 (point)
207 (or (search-forward "\n\n" nil t) (point-max)))
208 (narrow-to-region
209 (or (search-forward "\n\n" nil t) (point))
210 (point-max))))
211 (let* ((case-fold-search (not (eq (downcase (symbol-name type))
212 (symbol-name type))))
213 (search-func
214 (cond ((memq type '(r R regexp Regexp))
215 're-search-forward)
216 ((memq type '(s S string String))
217 'search-forward)
218 (t
219 (error "Illegal match type: %s" type)))))
220 (goto-char (point-min))
221 (prog1
222 (funcall search-func match nil t)
223 (widen)))))))
224
225 (provide 'gnus-logic)
226
227 ;;; gnus-logic.el ends here.