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1 ;;; gnus-logic.el --- advanced scoring code for Gnus
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2 ;; Copyright (C) 1996,97 Free Software Foundation, Inc.
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3
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4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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5 ;; Keywords: news
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6
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7 ;; This file is part of GNU Emacs.
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8
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9 ;; GNU Emacs is free software; you can redistribute it and/or modify
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10 ;; it under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; GNU Emacs is distributed in the hope that it will be useful,
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15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 ;; GNU General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Commentary:
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25
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26 ;;; Code:
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27
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28 (require 'gnus)
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29 (require 'gnus-score)
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30 (require 'gnus-util)
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31
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30
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32 ;;; Internal variables.
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16
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33
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34 (defvar gnus-advanced-headers nil)
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35
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36 ;; To avoid having 8-bit characters in the source file.
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37 (defvar gnus-advanced-not (intern (format "%c" 172)))
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38
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39 (defconst gnus-advanced-index
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40 ;; Name to index alist.
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41 '(("number" 0 gnus-advanced-integer)
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42 ("subject" 1 gnus-advanced-string)
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43 ("from" 2 gnus-advanced-string)
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44 ("date" 3 gnus-advanced-date)
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45 ("message-id" 4 gnus-advanced-string)
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46 ("references" 5 gnus-advanced-string)
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47 ("chars" 6 gnus-advanced-integer)
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48 ("lines" 7 gnus-advanced-integer)
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49 ("xref" 8 gnus-advanced-string)
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50 ("head" nil gnus-advanced-body)
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51 ("body" nil gnus-advanced-body)
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52 ("all" nil gnus-advanced-body)))
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53
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54 (eval-and-compile
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55 (autoload 'parse-time-string "parse-time"))
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30
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56
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57 (defun gnus-score-advanced (rule &optional trace)
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58 "Apply advanced scoring RULE to all the articles in the current group."
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59 (let ((headers gnus-newsgroup-headers)
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60 gnus-advanced-headers score)
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61 (while (setq gnus-advanced-headers (pop headers))
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62 (when (gnus-advanced-score-rule (car rule))
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63 ;; This rule was successful, so we add the score to
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64 ;; this article.
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65 (if (setq score (assq (mail-header-number gnus-advanced-headers)
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66 gnus-newsgroup-scored))
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67 (setcdr score
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68 (+ (cdr score)
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69 (or (nth 1 rule)
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70 gnus-score-interactive-default-score)))
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71 (push (cons (mail-header-number gnus-advanced-headers)
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72 (or (nth 1 rule)
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73 gnus-score-interactive-default-score))
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74 gnus-newsgroup-scored)
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75 (when trace
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76 (push (cons "A file" rule)
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77 gnus-score-trace)))))))
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78
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79 (defun gnus-advanced-score-rule (rule)
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80 "Apply RULE to `gnus-advanced-headers'."
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81 (let ((type (car rule)))
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30
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82 (cond
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16
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83 ;; "And" rule.
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84 ((or (eq type '&) (eq type 'and))
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85 (pop rule)
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86 (if (not rule)
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87 t ; Empty rule is true.
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88 (while (and rule
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89 (gnus-advanced-score-rule (car rule)))
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90 (pop rule))
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91 ;; If all the rules were true, then `rule' should be nil.
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92 (not rule)))
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93 ;; "Or" rule.
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94 ((or (eq type '|) (eq type 'or))
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95 (pop rule)
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96 (if (not rule)
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97 nil
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98 (while (and rule
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99 (not (gnus-advanced-score-rule (car rule))))
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100 (pop rule))
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101 ;; If one of the rules returned true, then `rule' should be non-nil.
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102 rule))
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103 ;; "Not" rule.
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104 ((or (eq type '!) (eq type 'not) (eq type gnus-advanced-not))
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105 (not (gnus-advanced-score-rule (nth 1 rule))))
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106 ;; This is a `1-'-type redirection rule.
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107 ((and (symbolp type)
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108 (string-match "^[0-9]+-$\\|^\\^+$" (symbol-name type)))
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109 (let ((gnus-advanced-headers
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110 (gnus-parent-headers
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111 gnus-advanced-headers
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112 (if (string-match "^\\([0-9]+\\)-$" (symbol-name type))
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113 ;; 1- type redirection.
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114 (string-to-number
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115 (substring (symbol-name type)
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116 (match-beginning 0) (match-end 0)))
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117 ;; ^^^ type redirection.
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118 (length (symbol-name type))))))
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119 (when gnus-advanced-headers
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120 (gnus-advanced-score-rule (nth 1 rule)))))
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121 ;; Plain scoring rule.
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122 ((stringp type)
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123 (gnus-advanced-score-article rule))
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124 ;; Bug-out time!
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125 (t
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126 (error "Unknown advanced score type: %s" rule)))))
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127
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128 (defun gnus-advanced-score-article (rule)
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129 ;; `rule' is a semi-normal score rule, so we find out
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130 ;; what function that's supposed to do the actual
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131 ;; processing.
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132 (let* ((header (car rule))
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133 (func (assoc (downcase header) gnus-advanced-index)))
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134 (if (not func)
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135 (error "No such header: %s" rule)
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136 ;; Call the score function.
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137 (funcall (caddr func) (or (cadr func) header)
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138 (cadr rule) (caddr rule)))))
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139
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140 (defun gnus-advanced-string (index match type)
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141 "See whether string MATCH of TYPE matches `gnus-advanced-headers' in INDEX."
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142 (let* ((type (or type 's))
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143 (case-fold-search (not (eq (downcase (symbol-name type))
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144 (symbol-name type))))
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145 (header (aref gnus-advanced-headers index)))
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146 (cond
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147 ((memq type '(r R regexp Regexp))
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148 (string-match match header))
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149 ((memq type '(s S string String))
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150 (string-match (regexp-quote match) header))
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151 ((memq type '(e E exact Exact))
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152 (string= match header))
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153 ((memq type '(f F fuzzy Fuzzy))
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154 (string-match (regexp-quote (gnus-simplify-subject-fuzzy match))
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155 header))
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156 (t
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157 (error "No such string match type: %s" type)))))
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158
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159 (defun gnus-advanced-integer (index match type)
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160 (if (not (memq type '(< > <= >= =)))
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161 (error "No such integer score type: %s" type)
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162 (funcall type match (or (aref gnus-advanced-headers index) 0))))
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163
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164 (defun gnus-advanced-date (index match type)
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165 (let ((date (encode-time (parse-time-string
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166 (aref gnus-advanced-headers index))))
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167 (match (encode-time (parse-time-string match))))
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30
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168 (cond
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169 ((eq type 'at)
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170 (equal date match))
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171 ((eq type 'before)
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172 (gnus-time-less match date))
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173 ((eq type 'after)
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174 (gnus-time-less date match))
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175 (t
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176 (error "No such date score type: %s" type)))))
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177
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178 (defun gnus-advanced-body (header match type)
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179 (when (string= header "all")
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180 (setq header "article"))
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181 (save-excursion
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182 (set-buffer nntp-server-buffer)
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183 (let* ((request-func (cond ((string= "head" header)
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184 'gnus-request-head)
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185 ((string= "body" header)
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186 'gnus-request-body)
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187 (t 'gnus-request-article)))
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188 ofunc article)
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189 ;; Not all backends support partial fetching. In that case,
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190 ;; we just fetch the entire article.
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191 (unless (gnus-check-backend-function
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192 (intern (concat "request-" header))
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193 gnus-newsgroup-name)
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194 (setq ofunc request-func)
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195 (setq request-func 'gnus-request-article))
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196 (setq article (mail-header-number gnus-advanced-headers))
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197 (gnus-message 7 "Scoring article %s..." article)
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198 (when (funcall request-func article gnus-newsgroup-name)
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199 (goto-char (point-min))
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200 ;; If just parts of the article is to be searched and the
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201 ;; backend didn't support partial fetching, we just narrow
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202 ;; to the relevant parts.
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203 (when ofunc
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204 (if (eq ofunc 'gnus-request-head)
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205 (narrow-to-region
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206 (point)
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207 (or (search-forward "\n\n" nil t) (point-max)))
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208 (narrow-to-region
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209 (or (search-forward "\n\n" nil t) (point))
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210 (point-max))))
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211 (let* ((case-fold-search (not (eq (downcase (symbol-name type))
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212 (symbol-name type))))
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213 (search-func
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214 (cond ((memq type '(r R regexp Regexp))
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215 're-search-forward)
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216 ((memq type '(s S string String))
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217 'search-forward)
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218 (t
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219 (error "Illegal match type: %s" type)))))
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220 (goto-char (point-min))
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221 (prog1
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222 (funcall search-func match nil t)
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223 (widen)))))))
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224
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225 (provide 'gnus-logic)
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226
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227 ;;; gnus-logic.el ends here.
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