mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-24 07:20:37 +00:00
199 lines
7.1 KiB
EmacsLisp
199 lines
7.1 KiB
EmacsLisp
;;; disp-table.el --- functions for dealing with char tables.
|
|
|
|
;; Copyright (C) 1987, 1994, 1995 Free Software Foundation, Inc.
|
|
|
|
;; Author: Erik Naggum <erik@naggum.no>
|
|
;; Based on a previous version by 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 2, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs 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:
|
|
|
|
(put 'display-table 'char-table-extra-slots 6)
|
|
|
|
;;;###autoload
|
|
(defun make-display-table ()
|
|
"Return a new, empty display table."
|
|
(make-char-table 'display-table nil))
|
|
|
|
(or standard-display-table
|
|
(setq standard-display-table (make-display-table)))
|
|
|
|
;;; Display-table slot names. The property value says which slot.
|
|
|
|
(put 'truncation 'display-table-slot 0)
|
|
(put 'wrap 'display-table-slot 1)
|
|
(put 'escape 'display-table-slot 2)
|
|
(put 'control 'display-table-slot 3)
|
|
(put 'selective-display 'display-table-slot 4)
|
|
(put 'vertical-border 'display-table-slot 5)
|
|
|
|
;;;###autoload
|
|
(defun display-table-slot (display-table slot)
|
|
"Return the value of the extra slot in DISPLAY-TABLE named SLOT.
|
|
SLOT may be a number from 0 to 5 inclusive, or a slot name (symbol).
|
|
Valid symbols are `truncation', `wrap', `escape', `control',
|
|
`selective-display', and `vertical-border'."
|
|
(let ((slot-number
|
|
(if (numberp slot) slot
|
|
(or (get slot 'display-table-slot)
|
|
(error "Invalid display-table slot name: %s" slot)))))
|
|
(char-table-extra-slot display-table slot-number)))
|
|
|
|
;;;###autoload
|
|
(defun set-display-table-slot (display-table slot value)
|
|
"Set the value of the extra slot in DISPLAY-TABLE named SLOT to VALUE.
|
|
SLOT may be a number from 0 to 5 inclusive, or a name (symbol).
|
|
Valid symbols are `truncation', `wrap', `escape', `control',
|
|
`selective-display', and `vertical-border'."
|
|
(let ((slot-number
|
|
(if (numberp slot) slot
|
|
(or (get slot 'display-table-slot)
|
|
(error "Invalid display-table slot name: %s" slot)))))
|
|
(set-char-table-extra-slot display-table slot-number value)))
|
|
|
|
;;;###autoload
|
|
(defun describe-display-table (dt)
|
|
"Describe the display table DT in a help buffer."
|
|
(with-output-to-temp-buffer "*Help*"
|
|
(princ "\nTruncation glyph: ")
|
|
(prin1 (display-table-slot dt 'truncation))
|
|
(princ "\nWrap glyph: ")
|
|
(prin1 (display-table-slot dt 'wrap))
|
|
(princ "\nEscape glyph: ")
|
|
(prin1 (display-table-slot dt 'escape))
|
|
(princ "\nCtrl glyph: ")
|
|
(prin1 (display-table-slot dt 'control))
|
|
(princ "\nSelective display glyph sequence: ")
|
|
(prin1 (display-table-slot dt 'selective-display))
|
|
(princ "\nVertical window border glyph: ")
|
|
(prin1 (display-table-slot dt 'vertical-border))
|
|
(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)
|
|
(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 standard-display-8bit (l h)
|
|
"Display characters in the range L to H literally."
|
|
(while (<= l h)
|
|
(if (and (>= l ?\ ) (< l 127))
|
|
(aset standard-display-table l 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))
|
|
(aset standard-display-table l nil)
|
|
(aset standard-display-table l nil))
|
|
(setq l (1+ l))))
|
|
|
|
;; 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.
|
|
;;;###autoload
|
|
(defun standard-display-ascii (c s)
|
|
"Display character C using printable string S."
|
|
(aset standard-display-table c (vconcat s)))
|
|
|
|
;;;###autoload
|
|
(defun standard-display-g1 (c sc)
|
|
"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"))
|
|
(aset standard-display-table c
|
|
(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.
|
|
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"))
|
|
(aset standard-display-table c
|
|
(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))
|
|
(aset standard-display-table c
|
|
(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)
|
|
(char-table-p standard-display-table)
|
|
;; Test 161, because 160 displays as a space.
|
|
(equal (aref standard-display-table 161) [161])))
|
|
(standard-display-default 160 255)
|
|
(standard-display-8bit 160 255)
|
|
;; Make non-line-break space display as a plain space.
|
|
;; Most X fonts do the wrong thing for code 160.
|
|
(aset standard-display-table 160 [32])))
|
|
|
|
(provide 'disp-table)
|
|
|
|
;;; disp-table.el ends here
|