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1 ;;; tm-parse.el --- MIME message parser
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2
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3 ;; Copyright (C) 1994,1995,1996 Free Software Foundation, Inc.
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4
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Version: $Id: tm-parse.el,v 1.1.1.2 1996/12/21 20:50:42 steve Exp $
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4
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7 ;; Keywords: mail, news, MIME, multimedia
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8
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9 ;; This file is part of tm (Tools for MIME).
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10
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11 ;; This program is free software; you can redistribute it and/or
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12 ;; modify it under the terms of the GNU General Public License as
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13 ;; published by the Free Software Foundation; either version 2, or (at
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14 ;; your option) any later version.
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15
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16 ;; This program is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; Code:
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27
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74
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28 (require 'std11)
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4
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29 (require 'tl-misc)
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30 (require 'tm-def)
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31
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32
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33 ;;; @ field parser
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34 ;;;
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35
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74
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36 (defconst rfc822/quoted-pair-regexp "\\\\.")
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37 (defconst rfc822/qtext-regexp
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38 (concat "[^" (char-list-to-string std11-non-qtext-char-list) "]"))
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39 (defconst rfc822/quoted-string-regexp
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40 (concat "\""
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41 (regexp-*
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42 (regexp-or rfc822/qtext-regexp rfc822/quoted-pair-regexp)
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43 )
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44 "\""))
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45
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4
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46 (defconst mime/content-parameter-value-regexp
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47 (concat "\\("
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48 rfc822/quoted-string-regexp
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49 "\\|[^; \t\n]*\\)"))
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50
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51 (defconst mime::parameter-regexp
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52 (concat "^[ \t]*\;[ \t]*\\(" mime/token-regexp "\\)"
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53 "[ \t]*=[ \t]*\\(" mime/content-parameter-value-regexp "\\)"))
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54
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55 (defun mime/parse-parameter (str)
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56 (if (string-match mime::parameter-regexp str)
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57 (let ((e (match-end 2)))
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58 (cons
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59 (cons (downcase (substring str (match-beginning 1) (match-end 1)))
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60 (std11-strip-quoted-string
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61 (substring str (match-beginning 2) e))
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62 )
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63 (substring str e)
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64 ))))
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65
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66 (defconst mime::ctype-regexp (concat "^" mime/content-type-subtype-regexp))
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67
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68 (defun mime/parse-Content-Type (string)
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69 "Parse STRING as field-body of Content-Type field. [tm-parse.el]"
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70 (setq string (std11-unfold-string string))
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71 (if (string-match mime::ctype-regexp string)
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72 (let* ((e (match-end 0))
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73 (ctype (downcase (substring string 0 e)))
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74 ret dest)
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75 (setq string (substring string e))
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76 (while (setq ret (mime/parse-parameter string))
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77 (setq dest (cons (car ret) dest)
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78 string (cdr ret))
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79 )
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80 (cons ctype (nreverse dest))
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81 )))
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82
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83 (defconst mime::dtype-regexp (concat "^" mime/disposition-type-regexp))
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84
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85 (defun mime/parse-Content-Disposition (string)
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86 "Parse STRING as field-body of Content-Disposition field. [tm-parse.el]"
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87 (setq string (std11-unfold-string string))
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88 (if (string-match mime::dtype-regexp string)
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89 (let* ((e (match-end 0))
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90 (ctype (downcase (substring string 0 e)))
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91 ret dest)
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92 (setq string (substring string e))
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93 (while (setq ret (mime/parse-parameter string))
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94 (setq dest (cons (car ret) dest)
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95 string (cdr ret))
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96 )
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97 (cons ctype (nreverse dest))
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98 )))
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99
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100
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101 ;;; @ field reader
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102 ;;;
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103
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104 (defun mime/Content-Type ()
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105 "Read field-body of Content-Type field from current-buffer,
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106 and return parsed it. [tm-parse.el]"
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107 (let ((str (std11-field-body "Content-Type")))
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108 (if str
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109 (mime/parse-Content-Type str)
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110 )))
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111
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112 (defun mime/Content-Transfer-Encoding (&optional default-encoding)
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113 "Read field-body of Content-Transfer-Encoding field from
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114 current-buffer, and return it.
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115 If is is not found, return DEFAULT-ENCODING. [tm-parse.el]"
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116 (let ((str (std11-field-body "Content-Transfer-Encoding")))
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117 (if str
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118 (progn
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119 (if (string-match "[ \t\n\r]+$" str)
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120 (setq str (substring str 0 (match-beginning 0)))
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121 )
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122 (downcase str)
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123 )
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124 default-encoding)
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125 ))
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126
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127 (defun mime/Content-Disposition ()
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128 "Read field-body of Content-Disposition field from current-buffer,
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129 and return parsed it. [tm-parse.el]"
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130 (let ((str (std11-field-body "Content-Disposition")))
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131 (if str
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132 (mime/parse-Content-Disposition str)
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133 )))
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134
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135
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136 ;;; @ message parser
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137 ;;;
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138
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139 (define-structure mime::content-info
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140 rcnum point-min point-max type parameters encoding children)
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141
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142
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143 (defun mime/parse-multipart (boundary ctype params encoding rcnum)
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144 (goto-char (point-min))
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145 (let* ((dash-boundary (concat "--" boundary))
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146 (delimiter (concat "\n" (regexp-quote dash-boundary)))
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147 (close-delimiter (concat delimiter "--[ \t]*$"))
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148 (beg (point-min))
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149 (end (progn
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150 (goto-char (point-max))
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151 (if (re-search-backward close-delimiter nil t)
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152 (match-beginning 0)
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153 (point-max)
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154 )))
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155 (rsep (concat delimiter "[ \t]*\n"))
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156 (dc-ctl
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157 (if (string-equal ctype "multipart/digest")
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158 '("message/rfc822")
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159 '("text/plain")
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160 ))
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161 cb ce ct ret ncb children (i 0))
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162 (save-restriction
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163 (narrow-to-region beg end)
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164 (goto-char beg)
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165 (re-search-forward rsep nil t)
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166 (setq cb (match-end 0))
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167 (while (re-search-forward rsep nil t)
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168 (setq ce (match-beginning 0))
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169 (setq ncb (match-end 0))
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170 (save-restriction
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171 (narrow-to-region cb ce)
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172 (setq ret (mime/parse-message dc-ctl "7bit" (cons i rcnum)))
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173 )
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174 (setq children (cons ret children))
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175 (goto-char (mime::content-info/point-max ret))
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176 (goto-char (setq cb ncb))
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177 (setq i (1+ i))
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178 )
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179 (setq ce (point-max))
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180 (save-restriction
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181 (narrow-to-region cb ce)
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182 (setq ret (mime/parse-message dc-ctl "7bit" (cons i rcnum)))
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183 )
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184 (setq children (cons ret children))
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185 )
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186 (mime::content-info/create rcnum beg (point-max)
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187 ctype params encoding
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188 (nreverse children))
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189 ))
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190
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191 (defun mime/parse-message (&optional ctl encoding rcnum)
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192 "Parse current-buffer as a MIME message. [tm-parse.el]"
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193 (setq ctl (or (mime/Content-Type) ctl))
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194 (setq encoding (or (mime/Content-Transfer-Encoding) encoding))
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195 (let ((ctype (car ctl))
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196 (params (cdr ctl))
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197 )
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198 (let ((boundary (assoc "boundary" params)))
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199 (cond (boundary
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200 (setq boundary (std11-strip-quoted-string (cdr boundary)))
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201 (mime/parse-multipart boundary ctype params encoding rcnum)
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202 )
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203 ((or (string-equal ctype "message/rfc822")
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204 (string-equal ctype "message/news")
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205 )
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206 (goto-char (point-min))
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207 (mime::content-info/create rcnum
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208 (point-min) (point-max)
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209 ctype params encoding
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210 (save-restriction
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211 (narrow-to-region
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212 (if (re-search-forward "^$" nil t)
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213 (1+ (match-end 0))
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214 (point-min)
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215 )
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216 (point-max))
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217 (list (mime/parse-message
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218 nil nil (cons 0 rcnum)))
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219 )
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220 )
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221 )
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222 (t
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223 (mime::content-info/create rcnum (point-min) (point-max)
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224 ctype params encoding nil)
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225 ))
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226 )))
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227
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228
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229 ;;; @ end
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230 ;;;
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231
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232 (provide 'tm-parse)
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233
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234 ;;; tm-parse.el ends here
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