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- ;;; 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
-