;;; disp-table.el --- functions for dealing with char tables.
-;; Copyright (C) 1987 Free Software Foundation, Inc.
+;; Copyright (C) 1987, 1994 Free Software Foundation, Inc.
+
+;; Author: Howard Gayle
+;; Maintainer: FSF
+;; Keywords: i18n
;; This file is part of GNU Emacs.
;; GNU Emacs 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 1, or (at your option)
+;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;;; Code:
-;; Written by Howard Gayle.
-
-(defun rope-to-vector (rope)
- (let* ((len (/ (length rope) 2))
- (vector (make-vector len nil))
- (i 0))
- (while (< i len)
- (aset vector i (rope-elt rope i))
- (setq i (1+ i)))))
+(defconst display-table-len 262
+ "The proper length of a display table.")
-(defun describe-display-table (DT)
+(defun describe-display-table (dt)
"Describe the display table DT in a help buffer."
(with-output-to-temp-buffer "*Help*"
(princ "\nTruncation glyph: ")
(prin1 (aref dt 258))
(princ "\nCtrl glyph: ")
(prin1 (aref dt 259))
- (princ "\nSelective display rope: ")
- (prin1 (rope-to-vector (aref dt 260)))
- (princ "\nCharacter display ropes:\n")
- (let ((vector (make-vector 256 nil))
- (i 0))
- (while (< i 256)
- (aset vector i
- (if (stringp (aref dt i))
- (rope-to-vector (aref dt i))
- (aref dt i)))
- (setq i (1+ i)))
- (describe-vector vector))
+ (princ "\nSelective display glyph sequence: ")
+ (prin1 (aref dt 260))
+ (princ "\nVertical window border glyph: ")
+ (prin1 (aref dt 261))
+ (princ "\nCharacter display glyph sequences:\n")
+ (save-excursion
+ (set-buffer standard-output)
+ (let ((vector (make-vector 256 nil))
+ (i 0))
+ (while (< i 256)
+ (aset vector i (aref dt i))
+ (setq i (1+ i)))
+ (describe-vector vector))
+ (help-mode))
(print-help-return-message)))
+;;;###autoload
(defun describe-current-display-table ()
- "Describe the display table in use in the selected window and buffer."
- (interactive)
- (describe-display-table
- (or (window-display-table (selected-window))
- buffer-display-table
- standard-display-table)))
-
+ "Describe the display table in use in the selected window and buffer."
+ (interactive)
+ (let ((disptab
+ (or (window-display-table (selected-window))
+ buffer-display-table
+ standard-display-table)))
+ (if disptab
+ (describe-display-table disptab)
+ (message "No display table"))))
+
+;;;###autoload
(defun make-display-table ()
- (make-vector 261 nil))
+ "Return a new, empty display table."
+ (make-vector display-table-len nil))
+;;;###autoload
(defun standard-display-8bit (l h)
"Display characters in the range L to H literally."
(while (<= l h)
(if (and (>= l ?\ ) (< l 127))
(if standard-display-table (aset standard-display-table l nil))
(or standard-display-table
- (setq standard-display-table (make-vector 261 nil)))
- (aset standard-display-table l l))
+ (setq standard-display-table (make-vector display-table-len nil)))
+ (aset standard-display-table l (vector l)))
+ (setq l (1+ l))))
+
+;;;###autoload
+(defun standard-display-default (l h)
+ "Display characters in the range L to H using the default notation."
+ (while (<= l h)
+ (if (and (>= l ?\ ) (< l 127))
+ (if standard-display-table (aset standard-display-table l nil))
+ (or standard-display-table
+ (setq standard-display-table (make-vector display-table-len nil)))
+ (aset standard-display-table l nil))
(setq l (1+ l))))
+;;;###autoload
+;; This function does NOT take terminal-dependent escape sequences.
+;; For that, you need to go through create-glyph. Use one of the
+;; other functions below, or roll your own.
(defun standard-display-ascii (c s)
- "Display character C using string S."
+ "Display character C using printable string S."
(or standard-display-table
- (setq standard-display-table (make-vector 261 nil)))
- (aset standard-display-table c (apply 'make-rope (append s nil))))
+ (setq standard-display-table (make-vector display-table-len nil)))
+ (aset standard-display-table c (apply 'vector (append s nil))))
+;;;###autoload
(defun standard-display-g1 (c sc)
- "Display character C as character SC in the g1 character set."
+ "Display character C as character SC in the g1 character set.
+This function assumes that your terminal uses the SO/SI characters;
+it is meaningless for an X frame."
+ (if window-system
+ (error "Cannot use string glyphs in a windowing system"))
(or standard-display-table
- (setq standard-display-table (make-vector 261 nil)))
+ (setq standard-display-table (make-vector display-table-len nil)))
(aset standard-display-table c
- (make-rope (create-glyph (concat "\016" (char-to-string sc) "\017")))))
+ (vector (create-glyph (concat "\016" (char-to-string sc) "\017")))))
+;;;###autoload
(defun standard-display-graphic (c gc)
- "Display character C as character GC in graphics character set."
+ "Display character C as character GC in graphics character set.
+This function assumes VT100-compatible escapes; it is meaningless for an
+X frame."
+ (if window-system
+ (error "Cannot use string glyphs in a windowing system"))
(or standard-display-table
- (setq standard-display-table (make-vector 261 nil)))
+ (setq standard-display-table (make-vector display-table-len nil)))
(aset standard-display-table c
- (make-rope (create-glyph (concat "\e(0" (char-to-string gc) "\e(B")))))
+ (vector (create-glyph (concat "\e(0" (char-to-string gc) "\e(B")))))
+;;;###autoload
(defun standard-display-underline (c uc)
"Display character C as character UC plus underlining."
+ (if window-system (require 'faces))
(or standard-display-table
- (setq standard-display-table (make-vector 261 nil)))
+ (setq standard-display-table (make-vector display-table-len nil)))
(aset standard-display-table c
- (make-rope (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m")))))
+ (vector
+ (if window-system
+ (logior uc (lsh (face-id (internal-find-face 'underline)) 8))
+ (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m"))))))
;; Allocate a glyph code to display by sending STRING to the terminal.
+;;;###autoload
(defun create-glyph (string)
(if (= (length glyph-table) 65536)
(error "No free glyph codes remain"))
+ ;; Don't use slots that correspond to ASCII characters.
+ (if (= (length glyph-table) 32)
+ (setq glyph-table (vconcat glyph-table (make-vector 224 nil))))
(setq glyph-table (vconcat glyph-table (list string)))
(1- (length glyph-table)))
+;;;###autoload
+(defun standard-display-european (arg)
+ "Toggle display of European characters encoded with ISO 8859.
+When enabled, characters in the range of 160 to 255 display not
+as octal escapes, but as accented characters.
+With prefix argument, enable European character display iff arg is positive."
+ (interactive "P")
+ (if (or (<= (prefix-numeric-value arg) 0)
+ (and (null arg)
+ (vectorp standard-display-table)
+ (>= (length standard-display-table) 161)
+ (equal (aref standard-display-table 160) [160])))
+ (standard-display-default 160 255)
+ (standard-display-8bit 160 255)))
+
(provide 'disp-table)
;;; disp-table.el ends here
HCoop / bpt / emacs.git / blobdiff