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std11-parse.el
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std11-parse.el
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;;; std11-parse.el --- STD 11 parser for GNU Emacs
;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; Keywords: mail, news, RFC 822, STD 11
;; Version: $Id$
;; This file is part of MU (Message Utilities).
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2, or (at
;; your option) any later version.
;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
(require 'std11)
(require 'emu)
;;; @ lexical analyze
;;;
(defconst std11-space-chars " \t\n")
(defconst std11-spaces-regexp (` (, (concat "[" std11-space-chars "]+"))))
(defconst std11-special-char-list '(?\] ?\[
?\( ?\) ?< ?> ?@
?, ?\; ?: ?\\ ?\"
?.))
(defconst std11-atom-regexp
(` (, (concat "^[^" std11-special-char-list std11-space-chars "]+"))))
(defun std11-analyze-spaces (string)
(if (and (string-match std11-spaces-regexp string)
(= (match-beginning 0) 0))
(let ((end (match-end 0)))
(cons (cons 'spaces (substring string 0 end))
(substring string end)
))))
(defun std11-analyze-special (str)
(if (and (> (length str) 0)
(memq (aref str 0) std11-special-char-list))
(cons (cons 'specials (substring str 0 1))
(substring str 1)
)))
(defun std11-analyze-atom (str)
(if (string-match std11-atom-regexp str)
(let ((end (match-end 0)))
(cons (cons 'atom (substring str 0 end))
(substring str end)
))))
(defun std11-check-enclosure (str open close &optional recursive from)
(let ((len (length str))
(i (or from 0))
)
(if (and (> len i)
(eq (aref str i) open))
(let (p chr)
(setq i (1+ i))
(catch 'tag
(while (< i len)
(setq chr (aref str i))
(cond ((eq chr ?\\)
(setq i (1+ i))
(if (>= i len)
(throw 'tag nil)
)
(setq i (1+ i))
)
((eq chr close)
(throw 'tag (1+ i))
)
((eq chr open)
(if (and recursive
(setq p (std11-check-enclosure
str open close recursive i))
)
(setq i p)
(throw 'tag nil)
))
(t
(setq i (1+ i))
))
))))))
(defun std11-analyze-quoted-string (str)
(let ((p (std11-check-enclosure str ?\" ?\")))
(if p
(cons (cons 'quoted-string (substring str 1 (1- p)))
(substring str p))
)))
(defun std11-analyze-domain-literal (str)
(let ((p (std11-check-enclosure str ?\[ ?\])))
(if p
(cons (cons 'domain-literal (substring str 1 (1- p)))
(substring str p))
)))
(defun std11-analyze-comment (str)
(let ((p (std11-check-enclosure str ?\( ?\) t)))
(if p
(cons (cons 'comment (substring str 1 (1- p)))
(substring str p))
)))
(defun std11-lexical-analyze (str)
(let (dest ret)
(while (not (string-equal str ""))
(setq ret
(or (std11-analyze-quoted-string str)
(std11-analyze-domain-literal str)
(std11-analyze-comment str)
(std11-analyze-spaces str)
(std11-analyze-special str)
(std11-analyze-atom str)
'((error) . "")
))
(setq dest (cons (car ret) dest))
(setq str (cdr ret))
)
(nreverse dest)
))
;;; @ parser
;;;
(defun std11-ignored-token-p (token)
(let ((type (car token)))
(or (eq type 'spaces)(eq type 'comment))
))
(defun std11-parse-token (lal)
(let (token itl)
(while (and lal
(progn
(setq token (car lal))
(std11-ignored-token-p token)
))
(setq lal (cdr lal))
(setq itl (cons token itl))
)
(cons (nreverse (cons token itl))
(cdr lal))
))
(defun std11-parse-ascii-token (lal)
(let (token itl parsed token-value)
(while (and lal
(setq token (car lal))
(or (std11-ignored-token-p token)
(if (and (setq token-value (cdr token))
(find-non-ascii-charset-string token-value)
)
(setq token nil)
)))
(setq lal (cdr lal))
(setq itl (cons token itl))
)
(if (and token
(setq parsed (nreverse (cons token itl)))
)
(cons parsed (cdr lal))
)))
(defun std11-parse-token-or-comment (lal)
(let (token itl)
(while (and lal
(progn
(setq token (car lal))
(eq (car token) 'spaces)
))
(setq lal (cdr lal))
(setq itl (cons token itl))
)
(cons (nreverse (cons token itl))
(cdr lal))
))
(defun std11-parse-word (lal)
(let ((ret (std11-parse-ascii-token lal)))
(if ret
(let ((elt (car ret))
(rest (cdr ret))
)
(if (or (assq 'atom elt)
(assq 'quoted-string elt))
(cons (cons 'word elt) rest)
)))))
(defun std11-parse-word-or-comment (lal)
(let ((ret (std11-parse-token-or-comment lal)))
(if ret
(let ((elt (car ret))
(rest (cdr ret))
)
(cond ((or (assq 'atom elt)
(assq 'quoted-string elt))
(cons (cons 'word elt) rest)
)
((assq 'comment elt)
(cons (cons 'comment-word elt) rest)
))
))))
(defun std11-parse-phrase (lal)
(let (ret phrase)
(while (setq ret (std11-parse-word-or-comment lal))
(setq phrase (append phrase (cdr (car ret))))
(setq lal (cdr ret))
)
(if phrase
(cons (cons 'phrase phrase) lal)
)))
(defun std11-parse-local-part (lal)
(let ((ret (std11-parse-word lal)))
(if ret
(let ((local-part (cdr (car ret))) dot)
(setq lal (cdr ret))
(while (and (setq ret (std11-parse-ascii-token lal))
(setq dot (car ret))
(string-equal (cdr (assq 'specials dot)) ".")
(setq ret (std11-parse-word (cdr ret)))
(setq local-part
(append local-part dot (cdr (car ret)))
)
(setq lal (cdr ret))
))
(cons (cons 'local-part local-part) lal)
))))
(defun std11-parse-sub-domain (lal)
(let ((ret (std11-parse-ascii-token lal)))
(if ret
(let ((sub-domain (car ret)))
(if (or (assq 'atom sub-domain)
(assq 'domain-literal sub-domain)
)
(cons (cons 'sub-domain sub-domain)
(cdr ret)
)
)))))
(defun std11-parse-domain (lal)
(let ((ret (std11-parse-sub-domain lal)))
(if ret
(let ((domain (cdr (car ret))) dot)
(setq lal (cdr ret))
(while (and (setq ret (std11-parse-ascii-token lal))
(setq dot (car ret))
(string-equal (cdr (assq 'specials dot)) ".")
(setq ret (std11-parse-sub-domain (cdr ret)))
(setq domain
(append domain dot (cdr (car ret)))
)
(setq lal (cdr ret))
))
(cons (cons 'domain domain) lal)
))))
(defun std11-parse-at-domain (lal)
(let ((ret (std11-parse-ascii-token lal)) at-sign)
(if (and ret
(setq at-sign (car ret))
(string-equal (cdr (assq 'specials at-sign)) "@")
(setq ret (std11-parse-domain (cdr ret)))
)
(cons (cons 'at-domain (append at-sign (cdr (car ret))))
(cdr ret))
)))
(defun std11-parse-addr-spec (lal)
(let ((ret (std11-parse-local-part lal))
addr)
(if (and ret
(prog1
(setq addr (cdr (car ret)))
(setq lal (cdr ret))
(and (setq ret (std11-parse-at-domain lal))
(setq addr (append addr (cdr (car ret))))
(setq lal (cdr ret))
)))
(cons (cons 'addr-spec addr) lal)
)))
(defun std11-parse-route (lal)
(let ((ret (std11-parse-at-domain lal))
route comma colon)
(if (and ret
(progn
(setq route (cdr (car ret)))
(setq lal (cdr ret))
(while (and (setq ret (std11-parse-ascii-token lal))
(setq comma (car ret))
(string-equal (cdr (assq 'specials comma)) ",")
(setq ret (std11-parse-at-domain (cdr ret)))
)
(setq route (append route comma (cdr (car ret))))
(setq lal (cdr ret))
)
(and (setq ret (std11-parse-ascii-token lal))
(setq colon (car ret))
(string-equal (cdr (assq 'specials colon)) ":")
(setq route (append route colon))
)
))
(cons (cons 'route route)
(cdr ret)
)
)))
(defun std11-parse-route-addr (lal)
(let ((ret (std11-parse-ascii-token lal))
< route addr-spec >)
(if (and ret
(setq < (car ret))
(string-equal (cdr (assq 'specials <)) "<")
(setq lal (cdr ret))
(progn (and (setq ret (std11-parse-route lal))
(setq route (cdr (car ret)))
(setq lal (cdr ret))
)
(setq ret (std11-parse-addr-spec lal))
)
(setq addr-spec (cdr (car ret)))
(setq lal (cdr ret))
(setq ret (std11-parse-ascii-token lal))
(setq > (car ret))
(string-equal (cdr (assq 'specials >)) ">")
)
(cons (cons 'route-addr (append route addr-spec))
(cdr ret)
)
)))
(defun std11-parse-phrase-route-addr (lal)
(let ((ret (std11-parse-phrase lal)) phrase)
(if ret
(progn
(setq phrase (cdr (car ret)))
(setq lal (cdr ret))
))
(if (setq ret (std11-parse-route-addr lal))
(cons (list 'phrase-route-addr
phrase
(cdr (car ret)))
(cdr ret))
)))
(defun std11-parse-mailbox (lal)
(let ((ret (or (std11-parse-phrase-route-addr lal)
(std11-parse-addr-spec lal)))
mbox comment)
(if (and ret
(prog1
(setq mbox (car ret))
(setq lal (cdr ret))
(if (and (setq ret (std11-parse-token-or-comment lal))
(setq comment (cdr (assq 'comment (car ret))))
)
(setq lal (cdr ret))
)))
(cons (list 'mailbox mbox comment)
lal)
)))
(defun std11-parse-group (lal)
(let ((ret (std11-parse-phrase lal))
phrase colon comma mbox semicolon)
(if (and ret
(setq phrase (cdr (car ret)))
(setq lal (cdr ret))
(setq ret (std11-parse-ascii-token lal))
(setq colon (car ret))
(string-equal (cdr (assq 'specials colon)) ":")
(setq lal (cdr ret))
(progn
(and (setq ret (std11-parse-mailbox lal))
(setq mbox (list (car ret)))
(setq lal (cdr ret))
(progn
(while (and (setq ret (std11-parse-ascii-token lal))
(setq comma (car ret))
(string-equal
(cdr (assq 'specials comma)) ",")
(setq lal (cdr ret))
(setq ret (std11-parse-mailbox lal))
(setq mbox (cons (car ret) mbox))
(setq lal (cdr ret))
)
)))
(and (setq ret (std11-parse-ascii-token lal))
(setq semicolon (car ret))
(string-equal (cdr (assq 'specials semicolon)) ";")
)))
(cons (list 'group phrase (nreverse mbox))
(cdr ret)
)
)))
(defun std11-parse-address (lal)
(or (std11-parse-group lal)
(std11-parse-mailbox lal)
))
(defun std11-parse-addresses (lal)
(let ((ret (std11-parse-address lal)))
(if ret
(let ((dest (list (car ret))))
(setq lal (cdr ret))
(while (and (setq ret (std11-parse-ascii-token lal))
(string-equal (cdr (assq 'specials (car ret))) ",")
(setq ret (std11-parse-address (cdr ret)))
)
(setq dest (cons (car ret) dest))
(setq lal (cdr ret))
)
(nreverse dest)
))))
(defun std11-parse-msg-id (lal)
(let ((ret (std11-parse-ascii-token lal))
< addr-spec >)
(if (and ret
(setq < (car ret))
(string-equal (cdr (assq 'specials <)) "<")
(setq lal (cdr ret))
(setq ret (std11-parse-addr-spec lal))
(setq addr-spec (car ret))
(setq lal (cdr ret))
(setq ret (std11-parse-ascii-token lal))
(setq > (car ret))
(string-equal (cdr (assq 'specials >)) ">")
)
(cons (cons 'msg-id (cdr addr-spec))
(cdr ret))
)))
;;; @ end
;;;
(provide 'std11-parse)
;;; std11-parse.el ends here