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1 ;;; rfc822.el --- hairy rfc822 parser for mail and news and suchlike
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2 ;; Keywords: mail
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3
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4 ;; Copyright (C) 1986, 1987, 1993 Free Software Foundation, Inc.
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5 ;; Author Richard Mlynarik.
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; 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 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; 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 XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: Not synched with FSF but very close.
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24
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25 ;; This code should probably be replaced with mail-extr.el once it's a
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26 ;; little more stable.
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27
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28
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29 (provide 'rfc822)
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30
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31 ;; uses address-start free, throws to address
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32 (defun rfc822-bad-address (reason)
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33 (save-restriction
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34 (insert "_^_")
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35 (narrow-to-region address-start
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36 (if (re-search-forward "[,;]" nil t)
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37 (max (point-min) (1- (point)))
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38 (point-max)))
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39 ;; make the error string be suitable for inclusion in (...)
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40 (let ((losers '("\\" "(" ")" "\n")))
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41 (while losers
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42 (goto-char (point-min))
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43 (while (search-forward (car losers) nil t)
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44 (backward-char 1)
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45 (insert ?\\)
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46 (forward-char 1))
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47 (setq losers (cdr losers))))
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48 (goto-char (point-min)) (insert "(Unparsable address -- "
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49 reason
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50 ":\n\t \"")
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51 (goto-char (point-max)) (insert "\")"))
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52 (rfc822-nuke-whitespace)
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53 (throw 'address (buffer-substring address-start (point))))
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54
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55 (defun rfc822-nuke-whitespace (&optional leave-space)
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56 (let (ch)
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57 (while (cond ((eobp)
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58 nil)
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59 ((= (setq ch (following-char)) ?\()
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60 (forward-char 1)
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61 (while (if (eobp)
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62 (rfc822-bad-address "Unbalanced comment (...)")
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63 (/= (setq ch (following-char)) ?\)))
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64 (cond ((looking-at "[^()\\]+")
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65 (replace-match ""))
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66 ((= ch ?\()
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67 (rfc822-nuke-whitespace))
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68 ((< (point) (1- (point-max)))
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69 (delete-char 2))
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70 (t
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71 (rfc822-bad-address "orphaned backslash"))))
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72 ;; delete remaining "()"
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73 (forward-char -1)
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74 (delete-char 2)
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75 t)
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76 ((memq ch '(?\ ?\t ?\n))
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77 (delete-region (point)
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78 (progn (skip-chars-forward " \t\n") (point)))
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79 t)
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80 (t
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81 nil)))
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82 (or (not leave-space)
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83 (eobp)
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84 (bobp)
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85 (= (preceding-char) ?\ )
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86 (insert ?\ ))))
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87
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88 (defun rfc822-looking-at (regex &optional leave-space)
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89 (if (cond ((stringp regex)
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90 (if (looking-at regex)
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91 (progn (goto-char (match-end 0))
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92 t)))
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93 (t
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94 (if (and (not (eobp))
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95 (= (following-char) regex))
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96 (progn (forward-char 1)
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97 t))))
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98 (let ((tem (match-data)))
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99 (rfc822-nuke-whitespace leave-space)
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100 (store-match-data tem)
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101 t)))
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102
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103 (defun rfc822-snarf-word ()
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104 ;; word is atom | quoted-string
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105 (cond ((= (following-char) ?\")
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106 ;; quoted-string
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107 (or (rfc822-looking-at "\"\\([^\"\\\n]\\|\\\\.\\|\\\\\n\\)*\"")
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108 (rfc822-bad-address "Unterminated quoted string")))
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109 ((rfc822-looking-at "[^][\000-\037\177-\377 ()<>@,;:\\\".]+")
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110 ;; atom
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111 )
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112 (t
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113 (rfc822-bad-address "Rubbish in address"))))
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114
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115 (defun rfc822-snarf-words ()
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116 (rfc822-snarf-word)
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117 (while (rfc822-looking-at ?.)
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118 (rfc822-snarf-word)))
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119
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120 (defun rfc822-snarf-subdomain ()
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121 ;; sub-domain is domain-ref | domain-literal
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122 (cond ((= (following-char) ?\[)
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123 ;; domain-ref
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124 (or (rfc822-looking-at "\\[\\([^][\\\n]\\|\\\\.\\|\\\\\n\\)*\\]")
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125 (rfc822-bad-address "Unterminated domain literal [...]")))
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126 ((rfc822-looking-at "[^][\000-\037\177-\377 ()<>@,;:\\\".]+")
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127 ;; domain-literal = atom
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128 )
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129 (t
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130 (rfc822-bad-address "Rubbish in host/domain specification"))))
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131
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132 (defun rfc822-snarf-domain ()
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133 (rfc822-snarf-subdomain)
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134 (while (rfc822-looking-at ?.)
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135 (rfc822-snarf-subdomain)))
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136
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137 (defun rfc822-snarf-frob-list (name separator terminator snarfer
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138 &optional return)
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139 (let ((first t)
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140 (list ())
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141 tem)
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142 (while (cond ((eobp)
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143 (rfc822-bad-address
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144 (format "End of addresses in middle of %s" name)))
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145 ((rfc822-looking-at terminator)
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146 nil)
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147 ((rfc822-looking-at separator)
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148 ;; multiple separators are allowed and do nothing.
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149 (while (rfc822-looking-at separator))
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150 t)
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151 (first
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152 t)
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153 (t
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154 (rfc822-bad-address
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155 (format "Gubbish in middle of %s" name))))
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156 (setq tem (funcall snarfer)
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157 first nil)
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158 (and return tem
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159 (setq list (if (listp tem)
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160 (nconc (reverse tem) list)
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161 (cons tem list)))))
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162 (nreverse list)))
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163
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164 ;; return either an address (a string) or a list of addresses
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165 (defun rfc822-addresses-1 (&optional allow-groups)
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166 ;; Looking for an rfc822 `address'
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167 ;; Either a group (1*word ":" [#mailbox] ";")
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168 ;; or a mailbox (addr-spec | 1*word route-addr)
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169 ;; addr-spec is (local-part "@" domain)
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170 ;; route-addr is ("<" [1#("@" domain) ":"] addr-spec ">")
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171 ;; local-part is (word *("." word))
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172 ;; word is (atom | quoted-string)
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173 ;; quoted-string is ("\([^\"\\n]\|\\.\|\\\n\)")
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174 ;; atom is [^\000-\037\177 ()<>@,;:\".[]]+
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175 ;; domain is sub-domain *("." sub-domain)
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176 ;; sub-domain is domain-ref | domain-literal
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177 ;; domain-literal is "[" *(dtext | quoted-pair) "]"
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178 ;; dtext is "[^][\\n"
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179 ;; domain-ref is atom
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180 (let ((address-start (point))
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181 (n 0))
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182 (catch 'address
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183 ;; optimize common cases:
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184 ;; foo
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185 ;; foo.bar@bar.zap
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186 ;; followed by "\\'\\|,\\|([^()\\]*)\\'"
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187 ;; other common cases are:
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188 ;; foo bar <foo.bar@baz.zap>
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189 ;; "foo bar" <foo.bar@baz.zap>
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190 ;; those aren't hacked yet.
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191 (if (and (rfc822-looking-at "[^][\000-\037\177-\377 ()<>@,;:\\\"]+\\(\\|@[^][\000-\037\177-\377 ()<>@,;:\\\"]+\\)" t)
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192 (progn (or (eobp)
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193 (rfc822-looking-at ?,))))
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194 (progn
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195 ;; rfc822-looking-at may have inserted a space
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196 (or (bobp) (/= (preceding-char) ?\ ) (delete-char -1))
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197 ;; relying on the fact that rfc822-looking-at <char>
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198 ;; doesn't mung match-data
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199 (throw 'address (buffer-substring address-start (match-end 0)))))
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200 (goto-char address-start)
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201 (while t
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202 (cond ((and (= n 1) (rfc822-looking-at ?@))
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203 ;; local-part@domain
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204 (rfc822-snarf-domain)
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205 (throw 'address
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206 (buffer-substring address-start (point))))
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207 ((rfc822-looking-at ?:)
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208 (cond ((not allow-groups)
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209 (rfc822-bad-address "A group name may not appear here"))
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210 ((= n 0)
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211 (rfc822-bad-address "No name for :...; group")))
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212 ;; group
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213 (throw 'address
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214 ;; return a list of addresses
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215 (rfc822-snarf-frob-list ":...; group" ?\, ?\;
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216 'rfc822-addresses-1 t)))
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217 ((rfc822-looking-at ?<)
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218 (let ((start (point))
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219 (strip t))
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220 (cond ((rfc822-looking-at ?>)
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221 ;; empty path
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222 ())
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223 ((and (not (eobp)) (= (following-char) ?\@))
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224 ;; <@foo.bar,@baz:quux@abcd.efg>
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225 (rfc822-snarf-frob-list "<...> address" ?\, ?\:
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226 (function (lambda ()
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227 (if (rfc822-looking-at ?\@)
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228 (rfc822-snarf-domain)
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229 (rfc822-bad-address
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230 "Gubbish in route-addr")))))
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231 (rfc822-snarf-words)
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232 (or (rfc822-looking-at ?@)
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233 (rfc822-bad-address "Malformed <..@..> address"))
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234 (rfc822-snarf-domain)
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235 (setq strip nil))
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236 ((progn (rfc822-snarf-words) (rfc822-looking-at ?@))
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237 ; allow <foo> (losing unix seems to do this)
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238 (rfc822-snarf-domain)))
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239 (let ((end (point)))
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240 (if (rfc822-looking-at ?\>)
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241 (throw 'address
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242 (buffer-substring (if strip start (1- start))
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243 (if strip end (1+ end))))
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244 (rfc822-bad-address "Unterminated <...> address")))))
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245 ((looking-at "[^][\000-\037\177-\377 ()<>@,;:\\.]")
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246 ;; this allows "." to be part of the words preceding
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247 ;; an addr-spec, since many broken mailers output
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248 ;; "Hern K. Herklemeyer III
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249 ;; <yank@megadeath.dod.gods-own-country>"
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250 (or (= n 0)
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251 (= (preceding-char) ?\ )
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252 (insert ?\ ))
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253 (rfc822-snarf-words)
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254 (setq n (1+ n)))
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255 ((= n 0)
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256 (throw 'address nil))
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257 ((= n 1) ; allow "foo" (losing unix seems to do this)
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258 (throw 'address
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259 (buffer-substring address-start (point))))
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260 ((or (eobp) (looking-at ","))
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261 (rfc822-bad-address "Missing comma or route-spec"))
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262 (t
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263 (rfc822-bad-address "Strange character or missing comma")))))))
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264
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265 (defun rfc822-addresses (header-text)
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266 (if (string-match "\\`[ \t]*\\([^][\000-\037\177-\377 ()<>@,;:\\\".]+\\)[ \t]*\\'"
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267 header-text)
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268 ;; Make very simple case moderately fast.
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269 (list (substring header-text (match-beginning 1) (match-end 1)))
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270 (let ((buf (generate-new-buffer " rfc822")))
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271 (unwind-protect
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272 (save-excursion
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273 (set-buffer buf)
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274 (make-local-variable 'case-fold-search)
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275 (setq case-fold-search nil) ;For speed(?)
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276 (insert header-text)
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277 ;; unfold continuation lines
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278 (goto-char (point-min))
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279
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280 (while (re-search-forward "\\([^\\]\\(\\\\\\\\\\)*\\)\n[ \t]" nil t)
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281 (replace-match "\\1 " t))
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282
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283 (goto-char (point-min))
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284 (rfc822-nuke-whitespace)
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285 (let ((list ())
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286 tem
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287 (p -1)
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288 address-start); this is for rfc822-bad-address
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289 (while (not (eobp))
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290 (setq address-start (point))
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291 (setq tem
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292 (catch 'address ; this is for rfc822-bad-address
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293 (cond ((rfc822-looking-at ?\,)
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294 nil)
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295 ((looking-at "[][\000-\037\177-\377@;:\\.>]")
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296 (forward-char)
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297 (rfc822-bad-address
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298 (format "Strange character \\%c found"
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299 (preceding-char))))
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300 (t
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301 (rfc822-addresses-1 t)))))
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302 (cond ((null tem))
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303 ((stringp tem)
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304 (setq list (cons tem list)))
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305 (t
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306 (setq list (nconc (nreverse tem) list))))
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307 (if (= (point) p)
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308 ;; Punt on losing, misformatted address / infinite loop.
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309 ;; For example: "lcm36651@uxa.cso.uiuc.edu (Hi! ;) )"
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310 (goto-char (point-max)))
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311 (setq p (point))
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312 )
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313 (nreverse list)))
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314 (and buf (kill-buffer buf))))))
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