Added 900-line support
[emacs.git] / lisp / disp-table.el
blob5ecf667c3333ef0711af88bb3abef176ba3066c5
1 ;;; disp-table.el --- functions for dealing with char tables.
3 ;; Copyright (C) 1987 Free Software Foundation, Inc.
5 ;; Author: Howard Gayle
6 ;; Maintainer: FSF
7 ;; Keywords: i14n
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to
23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 ;;; Code:
27 (defun describe-display-table (dt)
28 "Describe the display table DT in a help buffer."
29 (with-output-to-temp-buffer "*Help*"
30 (princ "\nTruncation glyph: ")
31 (prin1 (aref dt 256))
32 (princ "\nWrap glyph: ")
33 (prin1 (aref dt 257))
34 (princ "\nEscape glyph: ")
35 (prin1 (aref dt 258))
36 (princ "\nCtrl glyph: ")
37 (prin1 (aref dt 259))
38 (princ "\nSelective display rope: ")
39 (prin1 (aref dt 260))
40 (princ "\nCharacter display ropes:\n")
41 (let ((vector (make-vector 256 nil))
42 (i 0))
43 (while (< i 256)
44 (aset vector i (aref dt i))
45 (setq i (1+ i)))
46 (describe-vector vector))
47 (print-help-return-message)))
49 ;;;###autoload
50 (defun describe-current-display-table ()
51 "Describe the display table in use in the selected window and buffer."
52 (interactive)
53 (describe-display-table
54 (or (window-display-table (selected-window))
55 buffer-display-table
56 standard-display-table)))
58 ;;;###autoload
59 (defun make-display-table ()
60 "Return a new, empty display table."
61 (make-vector 261 nil))
63 ;;;###autoload
64 (defun standard-display-8bit (l h)
65 "Display characters in the range L to H literally."
66 (while (<= l h)
67 (if (and (>= l ?\ ) (< l 127))
68 (if standard-display-table (aset standard-display-table l nil))
69 (or standard-display-table
70 (setq standard-display-table (make-vector 261 nil)))
71 (aset standard-display-table l l))
72 (setq l (1+ l))))
74 ;;;###autoload
75 (defun standard-display-ascii (c s)
76 "Display character C using string S."
77 (or standard-display-table
78 (setq standard-display-table (make-vector 261 nil)))
79 (aset standard-display-table c (apply 'make-rope (append s nil))))
81 ;;;###autoload
82 (defun standard-display-g1 (c sc)
83 "Display character C as character SC in the g1 character set."
84 (or standard-display-table
85 (setq standard-display-table (make-vector 261 nil)))
86 (aset standard-display-table c
87 (make-rope (create-glyph (concat "\016" (char-to-string sc) "\017")))))
89 ;;;###autoload
90 (defun standard-display-graphic (c gc)
91 "Display character C as character GC in graphics character set."
92 (or standard-display-table
93 (setq standard-display-table (make-vector 261 nil)))
94 (aset standard-display-table c
95 (make-rope (create-glyph (concat "\e(0" (char-to-string gc) "\e(B")))))
97 ;;;###autoload
98 (defun standard-display-underline (c uc)
99 "Display character C as character UC plus underlining."
100 (or standard-display-table
101 (setq standard-display-table (make-vector 261 nil)))
102 (aset standard-display-table c
103 (make-rope (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m")))))
105 ;; Allocate a glyph code to display by sending STRING to the terminal.
106 ;;;###autoload
107 (defun create-glyph (string)
108 (if (= (length glyph-table) 65536)
109 (error "No free glyph codes remain"))
110 (setq glyph-table (vconcat glyph-table (list string)))
111 (1- (length glyph-table)))
113 (provide 'disp-table)
115 ;;; disp-table.el ends here