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328 lines
10 KiB
EmacsLisp
328 lines
10 KiB
EmacsLisp
;;; rfc822.el --- hairy rfc822 parser for mail and news and suchlike
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;; Copyright (C) 1986-1987, 1990, 2001-2018 Free Software Foundation,
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;; Inc.
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;; Author: Richard Mlynarik <mly@eddie.mit.edu>
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: mail
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Support functions for parsing RFC-822 headers, used by mail and news
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;; modes.
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;;; Code:
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(defvar rfc822-address-start)
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;; uses rfc822-address-start free, throws to address
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(defun rfc822-bad-address (reason)
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(save-restriction
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(insert "_^_")
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(narrow-to-region rfc822-address-start
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(if (re-search-forward "[,;]" nil t)
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(max (point-min) (1- (point)))
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(point-max)))
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;; make the error string be suitable for inclusion in (...)
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(let ((losers '("\\" "(" ")" "\n")))
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(while losers
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(goto-char (point-min))
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(while (search-forward (car losers) nil t)
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(backward-char 1)
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(insert ?\\)
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(forward-char 1))
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(setq losers (cdr losers))))
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(goto-char (point-min)) (insert "(Unparsable address -- "
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reason
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": \"")
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(goto-char (point-max)) (insert "\")"))
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(rfc822-nuke-whitespace)
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(throw 'address (buffer-substring rfc822-address-start (point))))
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(defun rfc822-nuke-whitespace (&optional leave-space)
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(let (ch)
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(while (cond ((eobp)
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nil)
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((= (setq ch (following-char)) ?\()
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(forward-char 1)
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(while (if (eobp)
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(rfc822-bad-address "Unbalanced comment (...)")
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(/= (setq ch (following-char)) ?\)))
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(cond ((looking-at "[^()\\]+")
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(replace-match ""))
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((= ch ?\()
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(rfc822-nuke-whitespace))
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((< (point) (1- (point-max)))
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(delete-char 2))
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(t
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(rfc822-bad-address "orphaned backslash"))))
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;; delete remaining "()"
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(forward-char -1)
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(delete-char 2)
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t)
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((memq ch '(?\ ?\t ?\n))
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(delete-region (point)
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(progn (skip-chars-forward " \t\n") (point)))
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t)
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(t
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nil)))
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(or (not leave-space)
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(eobp)
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(bobp)
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(= (preceding-char) ?\ )
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(insert ?\ ))))
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(defun rfc822-looking-at (regex &optional leave-space)
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(if (cond ((stringp regex)
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(if (looking-at regex)
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(progn (goto-char (match-end 0))
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t)))
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(t
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(if (and (not (eobp))
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(= (following-char) regex))
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(progn (forward-char 1)
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t))))
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(let ((tem (match-data)))
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(rfc822-nuke-whitespace leave-space)
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(set-match-data tem)
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t)))
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(defun rfc822-snarf-word ()
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;; word is atom | quoted-string
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(cond ((= (following-char) ?\")
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;; quoted-string
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(or (rfc822-looking-at "\"\\([^\"\\\n]\\|\\\\.\\|\\\\\n\\)*\"")
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(rfc822-bad-address "Unterminated quoted string")))
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((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+")
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;; atom
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)
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(t
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(rfc822-bad-address "Rubbish in address"))))
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(defun rfc822-snarf-words ()
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(rfc822-snarf-word)
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(while (rfc822-looking-at ?.)
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(rfc822-snarf-word)))
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(defun rfc822-snarf-subdomain ()
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;; sub-domain is domain-ref | domain-literal
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(cond ((= (following-char) ?\[)
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;; domain-ref
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(or (rfc822-looking-at "\\[\\([^][\\\n]\\|\\\\.\\|\\\\\n\\)*\\]")
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(rfc822-bad-address "Unterminated domain literal [...]")))
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((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+")
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;; domain-literal = atom
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)
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(t
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(rfc822-bad-address "Rubbish in host/domain specification"))))
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(defun rfc822-snarf-domain ()
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(rfc822-snarf-subdomain)
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(while (rfc822-looking-at ?.)
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(rfc822-snarf-subdomain)))
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(defun rfc822-snarf-frob-list (name separator terminator snarfer
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&optional return)
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(let ((first t)
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(list ())
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tem)
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(while (cond ((eobp)
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(rfc822-bad-address
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(format "End of addresses in middle of %s" name)))
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((rfc822-looking-at terminator)
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nil)
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((rfc822-looking-at separator)
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;; multiple separators are allowed and do nothing.
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(while (rfc822-looking-at separator))
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t)
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(first
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t)
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(t
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(rfc822-bad-address
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(format "Gubbish in middle of %s" name))))
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(setq tem (funcall snarfer)
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first nil)
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(and return tem
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(setq list (if (listp tem)
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(nconc (reverse tem) list)
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(cons tem list)))))
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(nreverse list)))
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;; return either an address (a string) or a list of addresses
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(defun rfc822-addresses-1 (&optional allow-groups)
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;; Looking for an rfc822 `address'
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;; Either a group (1*word ":" [#mailbox] ";")
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;; or a mailbox (addr-spec | 1*word route-addr)
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;; addr-spec is (local-part "@" domain)
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;; route-addr is ("<" [1#("@" domain) ":"] addr-spec ">")
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;; local-part is (word *("." word))
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;; word is (atom | quoted-string)
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;; quoted-string is ("\([^\"\\n]\|\\.\|\\\n\)")
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;; atom is [^\000-\037\177 ()<>@,;:\".[]]+
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;; domain is sub-domain *("." sub-domain)
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;; sub-domain is domain-ref | domain-literal
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;; domain-literal is "[" *(dtext | quoted-pair) "]"
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;; dtext is "[^][\\n"
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;; domain-ref is atom
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(let ((rfc822-address-start (point))
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(n 0))
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(catch 'address
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;; optimize common cases:
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;; foo
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;; foo.bar@bar.zap
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;; followed by "\\'\\|,\\|([^()\\]*)\\'"
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;; other common cases are:
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;; foo bar <foo.bar@baz.zap>
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;; "foo bar" <foo.bar@baz.zap>
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;; those aren't hacked yet.
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(if (and (rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\"]+\\(\\|@[^][\000-\037 ()<>@,;:\\\"]+\\)" t)
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(progn (or (eobp)
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(rfc822-looking-at ?,))))
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(progn
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;; rfc822-looking-at may have inserted a space
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(or (bobp) (/= (preceding-char) ?\ ) (delete-char -1))
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;; relying on the fact that rfc822-looking-at <char>
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;; doesn't mung match-data
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(throw 'address (buffer-substring rfc822-address-start (match-end 0)))))
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(goto-char rfc822-address-start)
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(while t
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(cond ((and (= n 1) (rfc822-looking-at ?@))
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;; local-part@domain
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(rfc822-snarf-domain)
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(throw 'address
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(buffer-substring rfc822-address-start (point))))
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((rfc822-looking-at ?:)
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(cond ((not allow-groups)
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(rfc822-bad-address "A group name may not appear here"))
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((= n 0)
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(rfc822-bad-address "No name for :...; group")))
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;; group
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(throw 'address
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;; return a list of addresses
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(rfc822-snarf-frob-list ":...; group" ?\, ?\;
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'rfc822-addresses-1 t)))
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((rfc822-looking-at ?<)
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(let ((start (point))
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(strip t))
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(cond ((rfc822-looking-at ?>)
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;; empty path
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())
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((and (not (eobp)) (= (following-char) ?\@))
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;; <@foo.bar,@baz:quux@abcd.efg>
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(rfc822-snarf-frob-list "<...> address" ?\, ?\:
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(function (lambda ()
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(if (rfc822-looking-at ?\@)
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(rfc822-snarf-domain)
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(rfc822-bad-address
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"Gubbish in route-addr")))))
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(rfc822-snarf-words)
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(or (rfc822-looking-at ?@)
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(rfc822-bad-address "Malformed <..@..> address"))
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(rfc822-snarf-domain)
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(setq strip nil))
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((progn (rfc822-snarf-words) (rfc822-looking-at ?@))
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; allow <foo> (losing unix seems to do this)
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(rfc822-snarf-domain)))
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(let ((end (point)))
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(if (rfc822-looking-at ?\>)
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(throw 'address
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(buffer-substring (if strip start (1- start))
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(if strip end (1+ end))))
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(rfc822-bad-address "Unterminated <...> address")))))
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((looking-at "[^][\000-\037 ()<>@,;:\\.]")
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;; this allows "." to be part of the words preceding
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;; an addr-spec, since many broken mailers output
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;; "Hern K. Herklemeyer III
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;; <yank@megadeath.dod.gods-own-country>"
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(let ((again t))
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(while again
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(or (= n 0) (bobp) (= (preceding-char) ?\ )
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(insert ?\ ))
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(rfc822-snarf-words)
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(setq n (1+ n))
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(setq again (or (rfc822-looking-at ?.)
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(looking-at "[^][\000-\037 ()<>@,;:\\.]"))))))
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((= n 0)
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(throw 'address nil))
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((= n 1) ; allow "foo" (losing unix seems to do this)
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(throw 'address
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(buffer-substring rfc822-address-start (point))))
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((> n 1)
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(rfc822-bad-address "Missing comma between addresses or badly-formatted address"))
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((or (eobp) (= (following-char) ?,))
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(rfc822-bad-address "Missing comma or route-spec"))
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(t
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(rfc822-bad-address "Strange character or missing comma")))))))
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(defun rfc822-addresses (header-text)
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(if (string-match "\\`[ \t]*\\([^][\000-\037 ()<>@,;:\\\".]+\\)[ \t]*\\'"
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header-text)
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;; Make very simple case moderately fast.
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(list (substring header-text (match-beginning 1) (match-end 1)))
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(let ((buf (generate-new-buffer " rfc822")))
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(unwind-protect
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(with-current-buffer buf
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(make-local-variable 'case-fold-search)
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(setq case-fold-search nil) ;For speed(?)
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(insert header-text)
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;; unfold continuation lines
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(goto-char (point-min))
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(while (re-search-forward "\\([^\\]\\(\\\\\\\\\\)*\\)\n[ \t]"
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nil t)
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(replace-match "\\1 " t))
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(goto-char (point-min))
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;; Give `rfc822-address-start' a non-nil initial value to
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;; prevent `rfc822-bad-address' from raising a
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;; `wrong-type-argument' error.
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(let* ((rfc822-address-start (point))
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list tem
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(err
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(catch 'address
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;; Note that `rfc822-nuke-whitespace' and
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;; `rfc822-looking-at' can throw.
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(rfc822-nuke-whitespace)
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(while (not (eobp))
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(setq rfc822-address-start (point))
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(setq tem
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(cond ((rfc822-looking-at ?\,)
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nil)
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((looking-at "[][\000-\037@;:\\.>)]")
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(forward-char)
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(catch 'address ; For rfc822-bad-address
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(rfc822-bad-address
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(format "Strange character \\%c found"
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(preceding-char)))))
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(t
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(rfc822-addresses-1 t))))
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(cond ((null tem))
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((stringp tem)
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(setq list (cons tem list)))
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(t
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(setq list (nconc (nreverse tem) list)))))
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nil)))
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(nreverse (append (if err (list err)) list))))
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(and buf (kill-buffer buf))))))
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(provide 'rfc822)
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;;; rfc822.el ends here
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