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+;;; gnus-logic.el --- advanced scoring code for Gnus
+;; Copyright (C) 1996,97 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; Keywords: news
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'gnus)
+(require 'gnus-score)
+(require 'gnus-util)
+
+;;; Internal variables.
+
+(defvar gnus-advanced-headers nil)
+
+;; To avoid having 8-bit characters in the source file.
+(defvar gnus-advanced-not (intern (format "%c" 172)))
+
+(defconst gnus-advanced-index
+  ;; Name to index alist.
+  '(("number" 0 gnus-advanced-integer)
+    ("subject" 1 gnus-advanced-string)
+    ("from" 2 gnus-advanced-string)
+    ("date" 3 gnus-advanced-date)
+    ("message-id" 4 gnus-advanced-string)
+    ("references" 5 gnus-advanced-string)
+    ("chars" 6 gnus-advanced-integer)
+    ("lines" 7 gnus-advanced-integer)
+    ("xref" 8 gnus-advanced-string)
+    ("head" nil gnus-advanced-body)
+    ("body" nil gnus-advanced-body)
+    ("all" nil gnus-advanced-body)))
+
+(eval-and-compile
+  (autoload 'parse-time-string "parse-time"))
+
+(defun gnus-score-advanced (rule &optional trace)
+  "Apply advanced scoring RULE to all the articles in the current group."
+  (let ((headers gnus-newsgroup-headers)
+	gnus-advanced-headers score)
+    (while (setq gnus-advanced-headers (pop headers))
+      (when (gnus-advanced-score-rule (car rule))
+	;; This rule was successful, so we add the score to
+	;; this article.
+	(if (setq score (assq (mail-header-number gnus-advanced-headers)
+			      gnus-newsgroup-scored))
+	    (setcdr score
+		    (+ (cdr score)
+		       (or (nth 1 rule)
+			   gnus-score-interactive-default-score)))
+	  (push (cons (mail-header-number gnus-advanced-headers)
+		      (or (nth 1 rule)
+			  gnus-score-interactive-default-score))
+		gnus-newsgroup-scored)
+	  (when trace
+	    (push (cons "A file" rule)
+		  gnus-score-trace)))))))
+
+(defun gnus-advanced-score-rule (rule)
+  "Apply RULE to `gnus-advanced-headers'."
+  (let ((type (car rule)))
+    (cond
+     ;; "And" rule.
+     ((or (eq type '&) (eq type 'and))
+      (pop rule)
+      (if (not rule)
+	  t				; Empty rule is true.
+	(while (and rule
+		    (gnus-advanced-score-rule (car rule)))
+	  (pop rule))
+	;; If all the rules were true, then `rule' should be nil.
+	(not rule)))
+     ;; "Or" rule.
+     ((or (eq type '|) (eq type 'or))
+      (pop rule)
+      (if (not rule)
+	  nil
+	(while (and rule
+		    (not (gnus-advanced-score-rule (car rule))))
+	  (pop rule))
+	;; If one of the rules returned true, then `rule' should be non-nil.
+	rule))
+     ;; "Not" rule.
+     ((or (eq type '!) (eq type 'not) (eq type gnus-advanced-not))
+      (not (gnus-advanced-score-rule (nth 1 rule))))
+     ;; This is a `1-'-type redirection rule.
+     ((and (symbolp type)
+	   (string-match "^[0-9]+-$\\|^\\^+$" (symbol-name type)))
+      (let ((gnus-advanced-headers
+	     (gnus-parent-headers
+	      gnus-advanced-headers
+	      (if (string-match "^\\([0-9]+\\)-$" (symbol-name type))
+		  ;; 1- type redirection.
+		  (string-to-number
+		   (substring (symbol-name type)
+			      (match-beginning 0) (match-end 0)))
+		;; ^^^ type redirection.
+		(length (symbol-name type))))))
+	(when gnus-advanced-headers
+	  (gnus-advanced-score-rule (nth 1 rule)))))
+     ;; Plain scoring rule.
+     ((stringp type)
+      (gnus-advanced-score-article rule))
+     ;; Bug-out time!
+     (t
+      (error "Unknown advanced score type: %s" rule)))))
+
+(defun gnus-advanced-score-article (rule)
+  ;; `rule' is a semi-normal score rule, so we find out
+  ;; what function that's supposed to do the actual
+  ;; processing.
+  (let* ((header (car rule))
+	 (func (assoc (downcase header) gnus-advanced-index)))
+    (if (not func)
+	(error "No such header: %s" rule)
+      ;; Call the score function.
+      (funcall (caddr func) (or (cadr func) header)
+	       (cadr rule) (caddr rule)))))
+
+(defun gnus-advanced-string (index match type)
+  "See whether string MATCH of TYPE matches `gnus-advanced-headers' in INDEX."
+  (let* ((type (or type 's))
+	 (case-fold-search (not (eq (downcase (symbol-name type))
+				    (symbol-name type))))
+	 (header (aref gnus-advanced-headers index)))
+    (cond
+     ((memq type '(r R regexp Regexp))
+      (string-match match header))
+     ((memq type '(s S string String))
+      (string-match (regexp-quote match) header))
+     ((memq type '(e E exact Exact))
+      (string= match header))
+     ((memq type '(f F fuzzy Fuzzy))
+      (string-match (regexp-quote (gnus-simplify-subject-fuzzy match))
+		    header))
+     (t
+      (error "No such string match type: %s" type)))))
+
+(defun gnus-advanced-integer (index match type)
+  (if (not (memq type '(< > <= >= =)))
+      (error "No such integer score type: %s" type)
+    (funcall type match (or (aref gnus-advanced-headers index) 0))))
+
+(defun gnus-advanced-date (index match type)
+  (let ((date (encode-time (parse-time-string
+			    (aref gnus-advanced-headers index))))
+	(match (encode-time (parse-time-string match))))
+    (cond
+     ((eq type 'at)
+      (equal date match))
+     ((eq type 'before)
+      (gnus-time-less match date))
+     ((eq type 'after)
+      (gnus-time-less date match))
+     (t
+      (error "No such date score type: %s" type)))))
+
+(defun gnus-advanced-body (header match type)
+  (when (string= header "all")
+    (setq header "article"))
+  (save-excursion
+    (set-buffer nntp-server-buffer)
+    (let* ((request-func (cond ((string= "head" header)
+				'gnus-request-head)
+			       ((string= "body" header)
+				'gnus-request-body)
+			       (t 'gnus-request-article)))
+	   ofunc article)
+      ;; Not all backends support partial fetching.  In that case,
+      ;; we just fetch the entire article.
+      (unless (gnus-check-backend-function
+	       (intern (concat "request-" header))
+	       gnus-newsgroup-name)
+	(setq ofunc request-func)
+	(setq request-func 'gnus-request-article))
+      (setq article (mail-header-number gnus-advanced-headers))
+      (gnus-message 7 "Scoring article %s..." article)
+      (when (funcall request-func article gnus-newsgroup-name)
+	(goto-char (point-min))
+	;; If just parts of the article is to be searched and the
+	;; backend didn't support partial fetching, we just narrow
+	;; to the relevant parts.
+	(when ofunc
+	  (if (eq ofunc 'gnus-request-head)
+	      (narrow-to-region
+	       (point)
+	       (or (search-forward "\n\n" nil t) (point-max)))
+	    (narrow-to-region
+	     (or (search-forward "\n\n" nil t) (point))
+	     (point-max))))
+	(let* ((case-fold-search (not (eq (downcase (symbol-name type))
+					  (symbol-name type))))
+	       (search-func
+		(cond ((memq type '(r R regexp Regexp))
+		       're-search-forward)
+		      ((memq type '(s S string String))
+		       'search-forward)
+		      (t
+		       (error "Illegal match type: %s" type)))))
+	  (goto-char (point-min))
+	  (prog1
+	      (funcall search-func match nil t)
+	    (widen)))))))
+
+(provide 'gnus-logic)
+
+;;; gnus-logic.el ends here.