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1 | ;;; disp-table.el --- functions for dealing with char tables. |
2 | ||
e5167999 ER |
3 | ;; Author: Howard Gayle |
4 | ;; Maintainer: FSF | |
5 | ;; Last-Modified: 16 Mar 1992 | |
6 | ||
a2535589 JA |
7 | ;; Copyright (C) 1987 Free Software Foundation, Inc. |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
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 | |
e5167999 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
14 | ;; any later version. |
15 | ||
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. | |
20 | ||
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. | |
24 | ||
e5167999 | 25 | ;;; Code: |
a2535589 JA |
26 | |
27 | (defun rope-to-vector (rope) | |
28 | (let* ((len (/ (length rope) 2)) | |
29 | (vector (make-vector len nil)) | |
30 | (i 0)) | |
31 | (while (< i len) | |
32 | (aset vector i (rope-elt rope i)) | |
33 | (setq i (1+ i))))) | |
34 | ||
35 | (defun describe-display-table (DT) | |
49116ac0 | 36 | "Describe the display table DT in a help buffer." |
a2535589 | 37 | (with-output-to-temp-buffer "*Help*" |
03131799 | 38 | (princ "\nTruncation glyph: ") |
a2535589 | 39 | (prin1 (aref dt 256)) |
03131799 | 40 | (princ "\nWrap glyph: ") |
a2535589 | 41 | (prin1 (aref dt 257)) |
03131799 | 42 | (princ "\nEscape glyph: ") |
a2535589 | 43 | (prin1 (aref dt 258)) |
03131799 | 44 | (princ "\nCtrl glyph: ") |
a2535589 JA |
45 | (prin1 (aref dt 259)) |
46 | (princ "\nSelective display rope: ") | |
47 | (prin1 (rope-to-vector (aref dt 260))) | |
48 | (princ "\nCharacter display ropes:\n") | |
49 | (let ((vector (make-vector 256 nil)) | |
50 | (i 0)) | |
51 | (while (< i 256) | |
52 | (aset vector i | |
53 | (if (stringp (aref dt i)) | |
54 | (rope-to-vector (aref dt i)) | |
55 | (aref dt i))) | |
56 | (setq i (1+ i))) | |
57 | (describe-vector vector)) | |
58 | (print-help-return-message))) | |
59 | ||
60 | (defun describe-current-display-table () | |
49116ac0 | 61 | "Describe the display table in use in the selected window and buffer." |
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62 | (interactive) |
63 | (describe-display-table | |
64 | (or (window-display-table (selected-window)) | |
65 | buffer-display-table | |
66 | standard-display-table))) | |
67 | ||
68 | (defun make-display-table () | |
69 | (make-vector 261 nil)) | |
70 | ||
71 | (defun standard-display-8bit (l h) | |
49116ac0 | 72 | "Display characters in the range L to H literally." |
a2535589 JA |
73 | (while (<= l h) |
74 | (if (and (>= l ?\ ) (< l 127)) | |
75 | (if standard-display-table (aset standard-display-table l nil)) | |
76 | (or standard-display-table | |
77 | (setq standard-display-table (make-vector 261 nil))) | |
78 | (aset standard-display-table l l)) | |
79 | (setq l (1+ l)))) | |
80 | ||
81 | (defun standard-display-ascii (c s) | |
82 | "Display character C using string S." | |
83 | (or standard-display-table | |
84 | (setq standard-display-table (make-vector 261 nil))) | |
85 | (aset standard-display-table c (apply 'make-rope (append s nil)))) | |
86 | ||
87 | (defun standard-display-g1 (c sc) | |
88 | "Display character C as character SC in the g1 character set." | |
89 | (or standard-display-table | |
90 | (setq standard-display-table (make-vector 261 nil))) | |
91 | (aset standard-display-table c | |
03131799 | 92 | (make-rope (create-glyph (concat "\016" (char-to-string sc) "\017"))))) |
a2535589 JA |
93 | |
94 | (defun standard-display-graphic (c gc) | |
95 | "Display character C as character GC in graphics character set." | |
96 | (or standard-display-table | |
97 | (setq standard-display-table (make-vector 261 nil))) | |
98 | (aset standard-display-table c | |
03131799 | 99 | (make-rope (create-glyph (concat "\e(0" (char-to-string gc) "\e(B"))))) |
a2535589 JA |
100 | |
101 | (defun standard-display-underline (c uc) | |
102 | "Display character C as character UC plus underlining." | |
103 | (or standard-display-table | |
104 | (setq standard-display-table (make-vector 261 nil))) | |
105 | (aset standard-display-table c | |
03131799 RS |
106 | (make-rope (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m"))))) |
107 | ||
108 | ;; Allocate a glyph code to display by sending STRING to the terminal. | |
109 | (defun create-glyph (string) | |
110 | (if (= (length glyph-table) 65536) | |
111 | (error "No free glyph codes remain")) | |
112 | (setq glyph-table (vconcat glyph-table (list string))) | |
113 | (1- (length glyph-table))) | |
a2535589 JA |
114 | |
115 | (provide 'disp-table) | |
c0274f38 ER |
116 | |
117 | ;;; disp-table.el ends here |