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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 1.1.1.1 1996/12/18 03:55:32 steve Exp $
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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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28 (require 'tl-822)
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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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36 (defconst mime/content-parameter-value-regexp
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37 (concat "\\("
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38 rfc822/quoted-string-regexp
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39 "\\|[^; \t\n]*\\)"))
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40
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41 (defconst mime::parameter-regexp
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42 (concat "^[ \t]*\;[ \t]*\\(" mime/token-regexp "\\)"
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43 "[ \t]*=[ \t]*\\(" mime/content-parameter-value-regexp "\\)"))
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44
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45 (defun mime/parse-parameter (str)
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46 (if (string-match mime::parameter-regexp str)
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47 (let ((e (match-end 2)))
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48 (cons
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49 (cons (downcase (substring str (match-beginning 1) (match-end 1)))
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50 (std11-strip-quoted-string
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51 (substring str (match-beginning 2) e))
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52 )
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53 (substring str e)
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54 ))))
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55
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56 (defconst mime::ctype-regexp (concat "^" mime/content-type-subtype-regexp))
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57
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58 (defun mime/parse-Content-Type (string)
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59 "Parse STRING as field-body of Content-Type field. [tm-parse.el]"
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60 (setq string (std11-unfold-string string))
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61 (if (string-match mime::ctype-regexp string)
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62 (let* ((e (match-end 0))
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63 (ctype (downcase (substring string 0 e)))
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64 ret dest)
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65 (setq string (substring string e))
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66 (while (setq ret (mime/parse-parameter string))
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67 (setq dest (cons (car ret) dest)
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68 string (cdr ret))
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69 )
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70 (cons ctype (nreverse dest))
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71 )))
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72
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73 (defconst mime::dtype-regexp (concat "^" mime/disposition-type-regexp))
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74
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75 (defun mime/parse-Content-Disposition (string)
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76 "Parse STRING as field-body of Content-Disposition field. [tm-parse.el]"
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77 (setq string (std11-unfold-string string))
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78 (if (string-match mime::dtype-regexp string)
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79 (let* ((e (match-end 0))
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80 (ctype (downcase (substring string 0 e)))
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81 ret dest)
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82 (setq string (substring string e))
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83 (while (setq ret (mime/parse-parameter string))
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84 (setq dest (cons (car ret) dest)
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85 string (cdr ret))
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86 )
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87 (cons ctype (nreverse dest))
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88 )))
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89
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90
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91 ;;; @ field reader
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92 ;;;
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93
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94 (defun mime/Content-Type ()
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95 "Read field-body of Content-Type field from current-buffer,
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96 and return parsed it. [tm-parse.el]"
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97 (let ((str (std11-field-body "Content-Type")))
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98 (if str
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99 (mime/parse-Content-Type str)
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100 )))
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101
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102 (defun mime/Content-Transfer-Encoding (&optional default-encoding)
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103 "Read field-body of Content-Transfer-Encoding field from
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104 current-buffer, and return it.
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105 If is is not found, return DEFAULT-ENCODING. [tm-parse.el]"
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106 (let ((str (std11-field-body "Content-Transfer-Encoding")))
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107 (if str
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108 (progn
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109 (if (string-match "[ \t\n\r]+$" str)
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110 (setq str (substring str 0 (match-beginning 0)))
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111 )
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112 (downcase str)
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113 )
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114 default-encoding)
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115 ))
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116
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117 (defun mime/Content-Disposition ()
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118 "Read field-body of Content-Disposition field from current-buffer,
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119 and return parsed it. [tm-parse.el]"
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120 (let ((str (std11-field-body "Content-Disposition")))
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121 (if str
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122 (mime/parse-Content-Disposition str)
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123 )))
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124
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125
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126 ;;; @ message parser
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127 ;;;
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128
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129 (define-structure mime::content-info
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130 rcnum point-min point-max type parameters encoding children)
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131
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132
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133 (defun mime/parse-multipart (boundary ctype params encoding rcnum)
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134 (goto-char (point-min))
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135 (let* ((dash-boundary (concat "--" boundary))
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136 (delimiter (concat "\n" (regexp-quote dash-boundary)))
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137 (close-delimiter (concat delimiter "--[ \t]*$"))
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138 (beg (point-min))
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139 (end (progn
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140 (goto-char (point-max))
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141 (if (re-search-backward close-delimiter nil t)
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142 (match-beginning 0)
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143 (point-max)
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144 )))
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145 (rsep (concat delimiter "[ \t]*\n"))
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146 (dc-ctl
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147 (if (string-equal ctype "multipart/digest")
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148 '("message/rfc822")
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149 '("text/plain")
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150 ))
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151 cb ce ct ret ncb children (i 0))
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152 (save-restriction
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153 (narrow-to-region beg end)
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154 (goto-char beg)
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155 (re-search-forward rsep nil t)
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156 (setq cb (match-end 0))
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157 (while (re-search-forward rsep nil t)
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158 (setq ce (match-beginning 0))
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159 (setq ncb (match-end 0))
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160 (save-restriction
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161 (narrow-to-region cb ce)
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162 (setq ret (mime/parse-message dc-ctl "7bit" (cons i rcnum)))
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163 )
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164 (setq children (cons ret children))
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165 (goto-char (mime::content-info/point-max ret))
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166 (goto-char (setq cb ncb))
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167 (setq i (1+ i))
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168 )
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169 (setq ce (point-max))
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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 )
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176 (mime::content-info/create rcnum beg (point-max)
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177 ctype params encoding
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178 (nreverse children))
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179 ))
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180
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181 (defun mime/parse-message (&optional ctl encoding rcnum)
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182 "Parse current-buffer as a MIME message. [tm-parse.el]"
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183 (setq ctl (or (mime/Content-Type) ctl))
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184 (setq encoding (or (mime/Content-Transfer-Encoding) encoding))
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185 (let ((ctype (car ctl))
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186 (params (cdr ctl))
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187 )
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188 (let ((boundary (assoc "boundary" params)))
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189 (cond (boundary
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190 (setq boundary (std11-strip-quoted-string (cdr boundary)))
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191 (mime/parse-multipart boundary ctype params encoding rcnum)
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192 )
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193 ((or (string-equal ctype "message/rfc822")
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194 (string-equal ctype "message/news")
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195 )
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196 (goto-char (point-min))
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197 (mime::content-info/create rcnum
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198 (point-min) (point-max)
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199 ctype params encoding
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200 (save-restriction
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201 (narrow-to-region
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202 (if (re-search-forward "^$" nil t)
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203 (1+ (match-end 0))
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204 (point-min)
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205 )
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206 (point-max))
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207 (list (mime/parse-message
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208 nil nil (cons 0 rcnum)))
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209 )
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210 )
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211 )
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212 (t
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213 (mime::content-info/create rcnum (point-min) (point-max)
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214 ctype params encoding nil)
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215 ))
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216 )))
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217
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218
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219 ;;; @ end
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220 ;;;
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221
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222 (provide 'tm-parse)
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223
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224 ;;; tm-parse.el ends here
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