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252 lines
7.3 KiB
EmacsLisp
252 lines
7.3 KiB
EmacsLisp
;;; ietf-drums.el --- functions for parsing RFC822bis headers
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;; Copyright (C) 1998, 1999, 2000, 2002
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;; Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; DRUMS is an IETF Working Group that works (or worked) on the
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;; successor to RFC822, "Standard For The Format Of Arpa Internet Text
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;; Messages". This library is based on
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;; draft-ietf-drums-msg-fmt-05.txt, released on 1998-08-05.
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;;; Code:
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(eval-when-compile (require 'cl))
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(require 'time-date)
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(require 'mm-util)
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(defvar ietf-drums-no-ws-ctl-token "\001-\010\013\014\016-\037\177"
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"US-ASCII control characters excluding CR, LF and white space.")
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(defvar ietf-drums-text-token "\001-\011\013\014\016-\177"
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"US-ASCII characters excluding CR and LF.")
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(defvar ietf-drums-specials-token "()<>[]:;@\\,.\""
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"Special characters.")
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(defvar ietf-drums-quote-token "\\"
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"Quote character.")
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(defvar ietf-drums-wsp-token " \t"
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"White space.")
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(defvar ietf-drums-fws-regexp
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(concat "[" ietf-drums-wsp-token "]*\n[" ietf-drums-wsp-token "]+")
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"Folding white space.")
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(defvar ietf-drums-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~"
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"Textual token.")
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(defvar ietf-drums-dot-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~."
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"Textual token including full stop.")
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(defvar ietf-drums-qtext-token
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(concat ietf-drums-no-ws-ctl-token "\041\043-\133\135-\177")
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"Non-white-space control characters, plus the rest of ASCII excluding
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backslash and doublequote.")
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(defvar ietf-drums-tspecials "][()<>@,;:\\\"/?="
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"Tspecials.")
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(defvar ietf-drums-syntax-table
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(let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
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(modify-syntax-entry ?\\ "/" table)
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(modify-syntax-entry ?< "(" table)
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(modify-syntax-entry ?> ")" table)
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(modify-syntax-entry ?@ "w" table)
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(modify-syntax-entry ?/ "w" table)
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(modify-syntax-entry ?= " " table)
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(modify-syntax-entry ?* " " table)
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(modify-syntax-entry ?\; " " table)
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(modify-syntax-entry ?\' " " table)
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table))
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(defun ietf-drums-token-to-list (token)
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"Translate TOKEN into a list of characters."
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(let ((i 0)
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b e c out range)
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(while (< i (length token))
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(setq c (mm-char-int (aref token i)))
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(incf i)
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(cond
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((eq c (mm-char-int ?-))
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(if b
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(setq range t)
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(push c out)))
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(range
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(while (<= b c)
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(push (mm-make-char 'ascii b) out)
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(incf b))
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(setq range nil))
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((= i (length token))
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(push (mm-make-char 'ascii c) out))
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(t
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(when b
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(push (mm-make-char 'ascii b) out))
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(setq b c))))
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(nreverse out)))
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(defsubst ietf-drums-init (string)
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(set-syntax-table ietf-drums-syntax-table)
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(insert string)
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(ietf-drums-unfold-fws)
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(goto-char (point-min)))
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(defun ietf-drums-remove-comments (string)
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"Remove comments from STRING."
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(with-temp-buffer
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(let (c)
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(ietf-drums-init string)
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(while (not (eobp))
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(setq c (char-after))
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(cond
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((eq c ?\")
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(forward-sexp 1))
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((eq c ?\()
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(delete-region (point) (progn (forward-sexp 1) (point))))
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(t
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(forward-char 1))))
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(buffer-string))))
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(defun ietf-drums-remove-whitespace (string)
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"Remove whitespace from STRING."
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(with-temp-buffer
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(ietf-drums-init string)
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(let (c)
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(while (not (eobp))
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(setq c (char-after))
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(cond
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((eq c ?\")
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(forward-sexp 1))
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((eq c ?\()
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(forward-sexp 1))
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((memq c '(? ?\t ?\n))
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(delete-char 1))
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(t
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(forward-char 1))))
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(buffer-string))))
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(defun ietf-drums-get-comment (string)
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"Return the first comment in STRING."
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(with-temp-buffer
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(ietf-drums-init string)
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(let (result c)
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(while (not (eobp))
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(setq c (char-after))
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(cond
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((eq c ?\")
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(forward-sexp 1))
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((eq c ?\()
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(setq result
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(buffer-substring
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(1+ (point))
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(progn (forward-sexp 1) (1- (point))))))
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(t
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(forward-char 1))))
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result)))
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(defun ietf-drums-strip (string)
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"Remove comments and whitespace from STRING."
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(ietf-drums-remove-whitespace (ietf-drums-remove-comments string)))
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(defun ietf-drums-parse-address (string)
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"Parse STRING and return a MAILBOX / DISPLAY-NAME pair."
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(with-temp-buffer
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(let (display-name mailbox c display-string)
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(ietf-drums-init string)
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(while (not (eobp))
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(setq c (char-after))
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(cond
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((or (eq c ? )
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(eq c ?\t))
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(forward-char 1))
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((eq c ?\()
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(forward-sexp 1))
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((eq c ?\")
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(push (buffer-substring
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(1+ (point)) (progn (forward-sexp 1) (1- (point))))
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display-name))
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((looking-at (concat "[" ietf-drums-atext-token "@" "]"))
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(push (buffer-substring (point) (progn (forward-sexp 1) (point)))
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display-name))
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((eq c ?<)
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(setq mailbox
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(ietf-drums-remove-whitespace
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(ietf-drums-remove-comments
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(buffer-substring
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(1+ (point))
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(progn (forward-sexp 1) (1- (point))))))))
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(t (error "Unknown symbol: %c" c))))
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;; If we found no display-name, then we look for comments.
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(if display-name
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(setq display-string
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(mapconcat 'identity (reverse display-name) " "))
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(setq display-string (ietf-drums-get-comment string)))
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(if (not mailbox)
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(when (string-match "@" display-string)
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(cons
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(mapconcat 'identity (nreverse display-name) "")
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(ietf-drums-get-comment string)))
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(cons mailbox display-string)))))
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(defun ietf-drums-parse-addresses (string)
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"Parse STRING and return a list of MAILBOX / DISPLAY-NAME pairs."
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(with-temp-buffer
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(ietf-drums-init string)
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(let ((beg (point))
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pairs c)
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(while (not (eobp))
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(setq c (char-after))
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(cond
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((memq c '(?\" ?< ?\())
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(forward-sexp 1))
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((eq c ?,)
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(push (ietf-drums-parse-address (buffer-substring beg (point)))
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pairs)
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(forward-char 1)
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(setq beg (point)))
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(t
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(forward-char 1))))
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(push (ietf-drums-parse-address (buffer-substring beg (point)))
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pairs)
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(nreverse pairs))))
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(defun ietf-drums-unfold-fws ()
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"Unfold folding white space in the current buffer."
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(goto-char (point-min))
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(while (re-search-forward ietf-drums-fws-regexp nil t)
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(replace-match " " t t))
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(goto-char (point-min)))
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(defun ietf-drums-parse-date (string)
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"Return an Emacs time spec from STRING."
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(apply 'encode-time (parse-time-string string)))
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(defun ietf-drums-narrow-to-header ()
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"Narrow to the header section in the current buffer."
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(narrow-to-region
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(goto-char (point-min))
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(if (re-search-forward "^\r?$" nil 1)
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(match-beginning 0)
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(point-max)))
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(goto-char (point-min)))
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(defun ietf-drums-quote-string (string)
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"Quote string if it needs quoting to be displayed in a header."
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(if (string-match (concat "[^" ietf-drums-atext-token "]") string)
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(concat "\"" string "\"")
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string))
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(provide 'ietf-drums)
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;;; ietf-drums.el ends here
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