/usr/share/emacs/site-lisp/mew/mew-header.el is in mew-beta 7.0.50~6.7+0.20170719-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Oct 2, 1996
;;; Code:
(require 'mew)
(defvar mew-anonymous-recipients ":;")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Header functions
;;;
(defun mew-header-goto-next ()
(while (looking-at mew-lwsp) (forward-line)))
;; see also mew-header-end
(defun mew-header-goto-end ()
(goto-char (point-min))
(if (re-search-forward mew-eoh nil t)
(beginning-of-line)
(goto-char (point-max))
(if (eolp) (insert "\n"))))
(defun mew-header-goto-body ()
(mew-header-goto-end)
(forward-line))
(defun mew-header-get-value (field &optional as-list)
"currently, when no match, it returns nil."
;; maybe called in narrowed region.
;; we cannot widen for citation.
(let ((case-fold-search t)
(regex (format "^%s[ \t]*" field))
start match ret)
(save-excursion
(mew-header-goto-end)
(save-restriction
(narrow-to-region (point-min) (point))
(goto-char (point-min))
(catch 'only-one
(while (re-search-forward regex nil t)
(setq start (match-end 0))
(forward-line)
(mew-header-goto-next)
(setq match (mew-buffer-substring start (1- (point))))
(unless (string= "" match)
(if ret
(if as-list
(setq ret (cons match ret))
(setq ret (concat ret "," match)))
(if as-list
(setq ret (list match))
(setq ret match))
(if (string= field mew-from:) (throw 'only-one nil))))))))
(if as-list
(nreverse ret)
ret)))
(defalias 'mew-header-existp 'mew-header-get-value)
(defun mew-header-replace-value (field value)
(let ((case-fold-search t)
(regex (format "^%s[ \t]*" field))
start)
(save-excursion
(mew-header-goto-end)
(save-restriction
(narrow-to-region (point-min) (point))
(goto-char (point-min))
;; make value with evaluating
(if (and (listp value)
(stringp (car value)))
(setq value (cons 'format value)))
(setq value
(condition-case e
(eval value)
(error
(format "*** ERROR: %s: %s ***" (car e) (car (cdr e))))))
(unless (or (stringp value)
(null value))
(setq value (format "%s" value)))
;; at this time, value is string or nil
(cond
((re-search-forward regex nil t)
(setq start (match-beginning 0))
(forward-line)
(mew-header-goto-next)
(delete-region start (point))
(if value
(mew-draft-header-insert field value)))
(value ;; insert when value is exist
(mew-header-goto-end)
(mew-draft-header-insert field value)))))))
(defun mew-make-field-regex (fields)
(concat "^\\(" (mapconcat 'identity fields "\\|") "\\)"))
(defun mew-header-delete-lines (fields)
(when fields
(let ((case-fold-search t)
(regex (mew-make-field-regex fields))
start)
(mew-header-goto-end)
(save-restriction
(narrow-to-region (point-min) (point))
(goto-char (point-min))
(while (re-search-forward regex nil t)
(setq start (match-beginning 0))
(forward-line)
(mew-header-goto-next)
(delete-region start (point)))))))
(defun mew-header-delete-other-lines (fields)
(when fields
(let ((case-fold-search t)
(regex (mew-make-field-regex fields))
start)
(mew-header-goto-end)
(save-restriction
(narrow-to-region (point-min) (point))
(goto-char (point-min))
(while (not (eobp))
(if start (delete-region start (point)))
(if (looking-at regex)
(setq start nil)
(setq start (point)))
(forward-line)
(mew-header-goto-next))
(if start (delete-region start (point)))))))
(defun mew-header-replace-lines (fields prefix)
(when fields
(let ((case-fold-search t)
(regex (mew-make-field-regex fields)))
(mew-header-goto-end)
(save-restriction
(narrow-to-region (point-min) (point))
(goto-char (point-min))
(while (re-search-forward regex nil t)
(beginning-of-line)
(insert prefix)
(forward-line))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Header sort
;;;
(defun mew-header-sort (order)
(when order
(let* ((case-fold-search t)
(len (length order))
(vec (make-vector len nil))
key beg n line other)
(mew-header-goto-end)
(save-restriction
(narrow-to-region (point-min) (point))
(goto-char (point-min))
(while (not (eobp))
(if (not (looking-at mew-keyval))
(forward-line)
(setq key (mew-match-string 1))
(setq beg (match-beginning 0))
(forward-line)
(mew-header-goto-next)
(setq line (mew-buffer-substring beg (point)))
(delete-region beg (point))
(setq n (mew-member-case-equal key order))
(if n
(aset vec n (concat (aref vec n) line))
(setq other (concat other line)))))
(dotimes (i len)
(and (aref vec i) (insert (aref vec i))))
(and other (insert other))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Header insertion
;;;
(defun mew-draft-header-insert (field value)
"No encoding. Just insert."
(if (and value (stringp field)) (insert field " " value "\n")))
(defun mew-draft-header-fill (field value)
(unless (mew-header-existp field) (mew-draft-header-insert field value)))
(defun mew-header-insert (key value &optional no-fold)
(if (and value (stringp key))
(let ((beg (point)) params med parname parval)
(when (listp value)
(setq params (cdr value))
(setq value (car value)))
(insert key)
(insert " ")
(setq med (point))
(if (string-match "^[\t -~]*$" value)
(insert value)
(mew-header-encode-text value nil (length key)))
(dolist (par params)
(mew-set '(parname parval) par)
(insert ";")
(cond
((string-match "^[-a-zA-Z0-9]+$" parval)
) ;; do nothing
((and (string= (mew-charset-guess-string parval) mew-us-ascii)
(not (string-match "\"" parval)))
(setq parval (concat "\"" parval "\"")))
(t
(setq parval (mew-param-encode parval))
(setq parname (concat parname "*"))))
(insert " " parname "=" parval))
(insert "\n")
(unless no-fold
(mew-header-fold-region beg (point) med)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Low-level functions to parse fields
;;;
;;
;; The purpose of this function is to purse and extract value
;; of address or content header. text is not target!
;;
;; ADDRP is t if STR are addresses.
;; ADDRP is nil if STR is a value of content-*.
;;
;; 'Winnie (The) Pooh <"W. Pooh" (loves "honey") @ (somewhere in) England>'
;; ->
;; '"W. Pooh"@England'
;;
;; For 'destination', SEP is ",".
;; For Content-*, SEP is ";".
;;
;; The special (i.e. SEP) is one of delimiters.
;; 'linear-white-space' is another delimiter.
;; 'quoted-string', 'comment', and 'domain-literal' is self-delimiting.
;; But 'domain-literal' (e.g. [1.2.3.4]) is meaningless.
;; So, the delimiters consists of SEP, SP, TAB, CRLF, "(", ")", and <">.
;;
;; 'qtext' remains. (It will be removed by mew-param-decode.)
;; ## how about 'quoted-pair'?
;;
;; 'comment' must be symmetric. That is, it must have the exact number of
;; ")" against that of ")". The entire 'comment', even if nested, is
;; ignored.
;;
;; 'encoded-word' is meaningless.
;; (1) Remove 'comment' so 'encoded-word' in 'comment' is meaningless.
;; (2) 'phrase' of 'mailbox' will be ignored because 'addr-spec' in
;; 'route-addr' will be extracted. So, 'encoded-word' in 'phrase' is
;; meaningless.
(defmacro mew-addrstr-parse-syntax-list-check-depth (&optional depth)
`(progn
(setq sep-cnt (1+ sep-cnt))
(if (and ,depth (>= sep-cnt ,depth))
(throw 'max nil))
(when (and (integerp mew-header-max-depth)
(>= sep-cnt mew-header-max-depth))
(mew-warn "Too many values. Truncate values over mew-header-max-depth")
(throw 'max nil))))
(defun mew-addrstr-parse-syntax-list (str sep addrp &optional depth allow-spc)
(if str (mew-addrstr-parse-syntax-list1 str sep addrp depth allow-spc)))
(defun mew-addrstr-parse-syntax-list1 (str sep addrp depth allow-spc)
(let* ((i 0) (len (length str))
(par-cnt 0) (tmp-cnt 0) (sep-cnt 0)
;; Emacs 23 has non-safe aset.
(tmp (mew-set-string-multibyte (mew-make-string len)))
c ret prevc
(do-clear
(lambda ()
(setq tmp-cnt 0)
(mew-addrstr-parse-syntax-list-check-depth depth)))
(do-cons-ret
(lambda ()
(setq ret (cons (substring tmp 0 tmp-cnt) ret))))
(do-copy
(lambda ()
(aset tmp tmp-cnt c)
(setq tmp-cnt (1+ tmp-cnt))))
(in-fold-quote
(lambda ()
(setq i (1+ i))
(catch 'fold-quote
(while (< i len)
(setq c (aref str i))
(cond
;; ((or (char-equal c ?\t) (char-equal c mew-sp))
;; (setq i (1+ i)))
((char-equal c ?\")
(funcall do-copy)
(throw 'quote nil))
(t
(funcall do-copy)
(throw 'fold-quote nil)))))))
(in-quote
(lambda ()
(funcall do-copy)
(setq i (1+ i))
(catch 'quote
(while (< i len)
(setq prevc c)
(setq c (aref str i))
(cond
((and (char-equal c ?\") (not (char-equal prevc ?\\)))
(funcall do-copy)
(throw 'quote nil))
((char-equal c ?\n)
(funcall in-fold-quote))
(t
(funcall do-copy)))
(setq i (1+ i))))))
(in-comment
(lambda ()
(setq par-cnt 1)
(setq i (1+ i))
(catch 'comment
(while (< i len)
(setq c (aref str i))
(cond
((char-equal c ?\()
(setq par-cnt (1+ par-cnt)))
((char-equal c ?\))
(setq par-cnt (1- par-cnt))
(if (eq par-cnt 0) (throw 'comment nil))))
(setq i (1+ i))))))
(do-skip-until
(lambda (target)
(while (and (< i len) (not (char-equal (aref str i) target)))
(setq i (1+ i)))))
(in-addr
(lambda ()
(cond
(addrp
(let (rbeg rend)
(setq i (1+ i))
(setq rbeg i)
(funcall do-skip-until ?>)
(when (> i rbeg)
(setq rend i)
;; note: to be used for substring, so not 1-.
;; should not be nested but easy to implement...
(setq ret (cons (car (mew-addrstr-parse-syntax-list (substring str rbeg rend) sep t)) ret))))
(funcall do-skip-until sep)
(funcall do-clear))
(t
;; just ignore
(funcall do-skip-until ?>)))))
(do-sep
(lambda ()
;; broken quoted string cannot be rescued because
;; the separator cannot be distinguished
(if (> tmp-cnt 0) (funcall do-cons-ret))
(funcall do-clear)))
(do-rescue
(lambda (var)
(save-match-data
(if (and addrp (string-match "<\\([^>]+\\)>" var))
(setq ret (cons (mew-match-string 1 var) ret))
(funcall do-cons-ret))))))
;; main
(catch 'max
(while (< i len)
(setq c (aref str i))
(cond
((char-equal c ?\")
(funcall in-quote))
((char-equal c ?\()
(funcall in-comment))
((char-equal c ?<)
(funcall in-addr))
((or (char-equal c ?\n) (char-equal c ?\t)
(and (not allow-spc) (char-equal c mew-sp)))
) ;; do nothing
((char-equal c sep)
(funcall do-sep))
(t
(funcall do-copy)))
(setq i (1+ i)))
;; broken quoted string can be rescued if it appears solely
(cond
((> par-cnt 0)
(funcall do-rescue str))
((> tmp-cnt 0)
(funcall do-rescue tmp))))
(setq ret (delete nil ret))
(when allow-spc
(setq ret (mapcar (lambda (str)
(if (string-match "^ +\\(.*\\)" str)
(mew-match-string 1 str)
str))
ret)))
(nreverse ret)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; High-level functions to parse fields
;;;
(defun mew-addrstr-parse-value (value)
(car (mew-addrstr-parse-syntax-list value ?\; nil 1)))
(defun mew-addrstr-parse-value-list (value)
(mew-addrstr-parse-syntax-list value ?\; nil))
(defun mew-addrstr-parse-value2 (value)
(car (mew-addrstr-parse-syntax-list value ?, nil 1)))
(defun mew-addrstr-parse-value-list2 (value)
(mew-addrstr-parse-syntax-list value ?, nil nil t))
;;
(defun mew-addrstr-parse-address (address)
(car (mew-addrstr-parse-syntax-list address ?, t 1)))
(defun mew-addrstr-parse-address-list (address)
(mew-addrstr-parse-syntax-list address ?, t))
(defun mew-header-parse-address (field)
(car
(mew-addrstr-parse-syntax-list
(mapconcat 'mew-header-get-value (list field) ",")
?, t 1)))
(defun mew-header-parse-address-list (field-list)
(mew-addrstr-parse-syntax-list
(mapconcat 'mew-header-get-value field-list ",")
?, t))
(defun mew-header-parse-address-list2 (field-list)
"Collect addresses from FIELD-LIST.
Remove anonymous addresses."
(let ((vals (mew-addrstr-parse-syntax-list
(mapconcat 'mew-header-get-value field-list ",")
?, t))
ret)
(dolist (val vals)
(unless (string-match mew-anonymous-recipients val)
(setq ret (cons val ret))))
(nreverse ret)))
;;
(defun mew-addrstr-extract-user-list (addr-list)
(mapcar 'mew-addrstr-extract-user addr-list))
(defun mew-addrstr-extract-user (addr)
"Extracts username from ADDR"
(if (string-match "@.*:" addr) ;; xxx what's this?
(setq addr (substring addr (match-end 0)))
(setq addr (mew-replace-character addr mew-sp ?_))
(setq addr (substring addr 0 (string-match "%" addr)))
(setq addr (substring addr 0 (string-match "@" addr)))
;; just for refile: "To: recipients:;" -> recipients
(setq addr (substring addr 0 (string-match mew-anonymous-recipients addr)))
;; removing Notes domain
(setq addr (substring addr 0 (string-match "/" addr)))))
;;
(defun mew-addrstr-append-domain (addr)
(if mew-addrbook-append-domain-p
(if (string-match "@" addr)
addr
(concat addr "@" (mew-mail-domain))) ;; xxx
addr))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Functions for ID
;;;
(defun mew-idstr-get-first-id (idstr)
(when (stringp idstr)
(if (string-match mew-regex-id idstr)
(mew-replace-white-space2 (match-string 0 idstr)))))
(defun mew-idstr-get-last-id (idstr)
(when (stringp idstr)
(let (beg end start)
(while (string-match mew-regex-id idstr start)
(setq beg (match-beginning 0))
(setq end (match-end 0))
(setq start (match-end 0)))
(if (and beg end)
(mew-replace-white-space2 (substring idstr beg end))))))
(defun mew-idstr-to-id-list (idstr &optional rev)
(when (stringp idstr)
(let (ret start)
(while (string-match mew-regex-id idstr start)
(setq start (match-end 0))
(setq ret (cons (mew-replace-white-space2 (match-string 0 idstr)) ret)))
(if rev
ret
(nreverse ret)))))
(defun mew-id-list-to-idstr (id-list)
(let (skip)
(if (integerp mew-references-max-count)
(setq skip (- (length id-list) mew-references-max-count)))
(if (and (integerp skip) (> skip 0))
(setq id-list (nthcdr skip id-list)))
(mew-join "\n\t" id-list)))
(provide 'mew-header)
;;; Copyright Notice:
;; Copyright (C) 1996-2015 Mew developing team.
;; All rights reserved.
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions
;; are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; 2. Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in the
;; documentation and/or other materials provided with the distribution.
;; 3. Neither the name of the team nor the names of its contributors
;; may be used to endorse or promote products derived from this software
;; without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS'' AND
;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
;; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE TEAM OR CONTRIBUTORS BE
;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
;; BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
;; OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
;; IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;; mew-header.el ends here
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