(defvar rfc822-address-start)
(defun rfc822-bad-address (reason)
(save-restriction
(insert "_^_")
(narrow-to-region rfc822-address-start
(if (re-search-forward "[,;]" nil t)
(max (point-min) (1- (point)))
(point-max)))
(let ((losers '("\\" "(" ")" "\n")))
(while losers
(goto-char (point-min))
(while (search-forward (car losers) nil t)
(backward-char 1)
(insert ?\\)
(forward-char 1))
(setq losers (cdr losers))))
(goto-char (point-min)) (insert "(Unparsable address -- "
reason
": \"")
(goto-char (point-max)) (insert "\")"))
(rfc822-nuke-whitespace)
(throw 'address (buffer-substring rfc822-address-start (point))))
(defun rfc822-nuke-whitespace (&optional leave-space)
(let (ch)
(while (cond ((eobp)
nil)
((= (setq ch (following-char)) ?\()
(forward-char 1)
(while (if (eobp)
(rfc822-bad-address "Unbalanced comment (...)")
(/= (setq ch (following-char)) ?\)))
(cond ((looking-at "[^()\\]+")
(replace-match ""))
((= ch ?\()
(rfc822-nuke-whitespace))
((< (point) (1- (point-max)))
(delete-char 2))
(t
(rfc822-bad-address "orphaned backslash"))))
(forward-char -1)
(delete-char 2)
t)
((memq ch '(?\ ?\t ?\n))
(delete-region (point)
(progn (skip-chars-forward " \t\n") (point)))
t)
(t
nil)))
(or (not leave-space)
(eobp)
(bobp)
(= (preceding-char) ?\ )
(insert ?\ ))))
(defun rfc822-looking-at (regex &optional leave-space)
(if (cond ((stringp regex)
(if (looking-at regex)
(progn (goto-char (match-end 0))
t)))
(t
(if (and (not (eobp))
(= (following-char) regex))
(progn (forward-char 1)
t))))
(let ((tem (match-data)))
(rfc822-nuke-whitespace leave-space)
(set-match-data tem)
t)))
(defun rfc822-snarf-word ()
(cond ((= (following-char) ?\")
;; quoted-string
(or (rfc822-looking-at "\"\\([^\"\\\n]\\|\\\\.\\|\\\\\n\\)*\"")
(rfc822-bad-address "Unterminated quoted string")))
((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+")
)
(t
(rfc822-bad-address "Rubbish in address"))))
(defun rfc822-snarf-words ()
(rfc822-snarf-word)
(while (rfc822-looking-at ?.)
(rfc822-snarf-word)))
(defun rfc822-snarf-subdomain ()
(cond ((= (following-char) ?\[)
(or (rfc822-looking-at "\\[\\([^][\\\n]\\|\\\\.\\|\\\\\n\\)*\\]")
(rfc822-bad-address "Unterminated domain literal [...]")))
((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+")
)
(t
(rfc822-bad-address "Rubbish in host/domain specification"))))
(defun rfc822-snarf-domain ()
(rfc822-snarf-subdomain)
(while (rfc822-looking-at ?.)
(rfc822-snarf-subdomain)))
(defun rfc822-snarf-frob-list (name separator terminator snarfer
&optional return)
(let ((first t)
(list ())
tem)
(while (cond ((eobp)
(rfc822-bad-address
(format "End of addresses in middle of %s" name)))
((rfc822-looking-at terminator)
nil)
((rfc822-looking-at separator)
(while (rfc822-looking-at separator))
t)
(first
t)
(t
(rfc822-bad-address
(format "Gubbish in middle of %s" name))))
(setq tem (funcall snarfer)
first nil)
(and return tem
(setq list (if (listp tem)
(nconc (reverse tem) list)
(cons tem list)))))
(nreverse list)))
(defun rfc822-addresses-1 (&optional allow-groups)
(let ((rfc822-address-start (point))
(n 0))
(catch 'address
(if (and (rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\"]+\\(\\|@[^][\000-\037 ()<>@,;:\\\"]+\\)" t)
(progn (or (eobp)
(rfc822-looking-at ?,))))
(progn
(or (bobp) (/= (preceding-char) ?\ ) (delete-char -1))
(throw 'address (buffer-substring rfc822-address-start (match-end 0)))))
(goto-char rfc822-address-start)
(while t
(cond ((and (= n 1) (rfc822-looking-at ?@))
(rfc822-snarf-domain)
(throw 'address
(buffer-substring rfc822-address-start (point))))
((rfc822-looking-at ?:)
(cond ((not allow-groups)
(rfc822-bad-address "A group name may not appear here"))
((= n 0)
(rfc822-bad-address "No name for :...; group")))
(throw 'address
(rfc822-snarf-frob-list ":...; group" ?\, ?\ 'rfc822-addresses-1 t)))
((rfc822-looking-at ?<)
(let ((start (point))
(strip t))
(cond ((rfc822-looking-at ?>)
())
((and (not (eobp)) (= (following-char) ?\@))
(rfc822-snarf-frob-list "<...> address" ?\, ?\:
(function (lambda ()
(if (rfc822-looking-at ?\@)
(rfc822-snarf-domain)
(rfc822-bad-address
"Gubbish in route-addr")))))
(rfc822-snarf-words)
(or (rfc822-looking-at ?@)
(rfc822-bad-address "Malformed <..@..> address"))
(rfc822-snarf-domain)
(setq strip nil))
((progn (rfc822-snarf-words) (rfc822-looking-at ?@))
(rfc822-snarf-domain)))
(let ((end (point)))
(if (rfc822-looking-at ?\>)
(throw 'address
(buffer-substring (if strip start (1- start))
(if strip end (1+ end))))
(rfc822-bad-address "Unterminated <...> address")))))
((looking-at "[^][\000-\037 ()<>@,;:\\.]")
(let ((again t))
(while again
(or (= n 0) (bobp) (= (preceding-char) ?\ )
(insert ?\ ))
(rfc822-snarf-words)
(setq n (1+ n))
(setq again (or (rfc822-looking-at ?.)
(looking-at "[^][\000-\037 ()<>@,;:\\.]"))))))
((= n 0)
(throw 'address nil))
((= n 1) (throw 'address
(buffer-substring rfc822-address-start (point))))
((> n 1)
(rfc822-bad-address "Missing comma between addresses or badly-formatted address"))
((or (eobp) (= (following-char) ?,))
(rfc822-bad-address "Missing comma or route-spec"))
(t
(rfc822-bad-address "Strange character or missing comma")))))))
(defun rfc822-addresses (header-text)
(if (string-match "\\`[ \t]*\\([^][\000-\037 ()<>@,;:\\\".]+\\)[ \t]*\\'"
header-text)
(list (substring header-text (match-beginning 1) (match-end 1)))
(let ((buf (generate-new-buffer " rfc822")))
(unwind-protect
(save-excursion
(set-buffer buf)
(make-local-variable 'case-fold-search)
(setq case-fold-search nil) (insert header-text)
(goto-char (point-min))
(while (re-search-forward "\\([^\\]\\(\\\\\\\\\\)*\\)\n[ \t]" nil t)
(replace-match "\\1 " t))
(goto-char (point-min))
(let ((list ())
tem
rfc822-address-start) (rfc822-nuke-whitespace)
(while (not (eobp))
(setq rfc822-address-start (point))
(setq tem
(catch 'address (cond ((rfc822-looking-at ?\,)
nil)
((looking-at "[][\000-\037@;:\\.>)]")
(forward-char)
(rfc822-bad-address
(format "Strange character \\%c found"
(preceding-char))))
(t
(rfc822-addresses-1 t)))))
(cond ((null tem))
((stringp tem)
(setq list (cons tem list)))
(t
(setq list (nconc (nreverse tem) list)))))
(nreverse list)))
(and buf (kill-buffer buf))))))
(provide 'rfc822)