;;; Last edited: 1999-12-18 18:54:53 lenst
;; Copyright (C) 1994 Lennart Staflin
;; Author: Steinar Bang, Falch Hurtigtrykk as., Oslo, 940711
;; Lennart Staflin <email@example.com>
;; 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
;; of the License, 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 this program; if not, write to the Free Software
;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;; Functions to convert character entities into displayable characters
;; and displayable characters back into character entities.
;;;; Variable declarations
(or (locate-data-directory "psgml")
"*Name of file holding relations between character codes and character
names of displayable characters")
(defvar sgml-display-char-alist-cache nil)
;;;; Function declarations
(defun sgml-display-char-alist ()
"Return the current display character alist.
Alist with entity name as key and display character as content."
(unless (file-exists-p sgml-display-char-list-filename)
(error "No display char file: %s"
(defun sgml-read-display-char-alist ()
(let (key disp-char alist)
(while (re-search-forward "^\\([0-9]+\\)[ \t]+\\(.+\\)$" nil t)
(setq key (buffer-substring (match-beginning 2) (match-end 2)))
(buffer-substring (match-beginning 1) (match-end 1)))))
(push (cons key disp-char)
(defun sgml-charent-to-dispchar-alist ()
"Association list to hold relations of the type
(CHARACTER-NAME . CHARACTER)
CHARACTER-NAME is a string holding a character name
CHARACTER is a string holding a single displayable character"
(let ((display-chars (sgml-display-char-alist))
(let ((char (cdr (assoc (sgml-entity-text entity)
(push (cons (sgml-entity-name entity) char) alist)))))
(defun sgml-charent-to-display-char ()
"Replace character entities with their display character equivalents"
(while (re-search-forward "&\\(\\w\\(\\w\\|\\s_\\)*\\);?" nil t)
(setq charent (buffer-substring
(match-beginning 1) (match-end 1)))
(if (setq replacement (cdr (assoc charent charent-to-char)))
(replace-match replacement t t)))))))
(defun sgml-display-char-to-charent ()
"Replace displayable characters with their character entity equivalents"
(let ((case-fold-search nil))
(loop for pair in (sgml-charent-to-dispchar-alist)
do (goto-char (point-min))
(while (search-forward (cdr pair) nil t)
(replace-match (concat "&" (car pair) ";") t t))))))
;;; psgml-charent.el ends here