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c0274f38 ER |
1 | ;;; disp-table.el --- functions for dealing with char tables. |
2 | ||
a2535589 JA |
3 | ;; Copyright (C) 1987 Free Software Foundation, Inc. |
4 | ||
5 | ;; This file is part of GNU Emacs. | |
6 | ||
7 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
8 | ;; it under the terms of the GNU General Public License as published by | |
9 | ;; the Free Software Foundation; either version 1, or (at your option) | |
10 | ;; any later version. | |
11 | ||
12 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
13 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;; GNU General Public License for more details. | |
16 | ||
17 | ;; You should have received a copy of the GNU General Public License | |
18 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
19 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | ||
21 | ||
03131799 | 22 | ;; Written by Howard Gayle. |
a2535589 JA |
23 | |
24 | (defun rope-to-vector (rope) | |
25 | (let* ((len (/ (length rope) 2)) | |
26 | (vector (make-vector len nil)) | |
27 | (i 0)) | |
28 | (while (< i len) | |
29 | (aset vector i (rope-elt rope i)) | |
30 | (setq i (1+ i))))) | |
31 | ||
32 | (defun describe-display-table (DT) | |
49116ac0 | 33 | "Describe the display table DT in a help buffer." |
a2535589 | 34 | (with-output-to-temp-buffer "*Help*" |
03131799 | 35 | (princ "\nTruncation glyph: ") |
a2535589 | 36 | (prin1 (aref dt 256)) |
03131799 | 37 | (princ "\nWrap glyph: ") |
a2535589 | 38 | (prin1 (aref dt 257)) |
03131799 | 39 | (princ "\nEscape glyph: ") |
a2535589 | 40 | (prin1 (aref dt 258)) |
03131799 | 41 | (princ "\nCtrl glyph: ") |
a2535589 JA |
42 | (prin1 (aref dt 259)) |
43 | (princ "\nSelective display rope: ") | |
44 | (prin1 (rope-to-vector (aref dt 260))) | |
45 | (princ "\nCharacter display ropes:\n") | |
46 | (let ((vector (make-vector 256 nil)) | |
47 | (i 0)) | |
48 | (while (< i 256) | |
49 | (aset vector i | |
50 | (if (stringp (aref dt i)) | |
51 | (rope-to-vector (aref dt i)) | |
52 | (aref dt i))) | |
53 | (setq i (1+ i))) | |
54 | (describe-vector vector)) | |
55 | (print-help-return-message))) | |
56 | ||
57 | (defun describe-current-display-table () | |
49116ac0 | 58 | "Describe the display table in use in the selected window and buffer." |
a2535589 JA |
59 | (interactive) |
60 | (describe-display-table | |
61 | (or (window-display-table (selected-window)) | |
62 | buffer-display-table | |
63 | standard-display-table))) | |
64 | ||
65 | (defun make-display-table () | |
66 | (make-vector 261 nil)) | |
67 | ||
68 | (defun standard-display-8bit (l h) | |
49116ac0 | 69 | "Display characters in the range L to H literally." |
a2535589 JA |
70 | (while (<= l h) |
71 | (if (and (>= l ?\ ) (< l 127)) | |
72 | (if standard-display-table (aset standard-display-table l nil)) | |
73 | (or standard-display-table | |
74 | (setq standard-display-table (make-vector 261 nil))) | |
75 | (aset standard-display-table l l)) | |
76 | (setq l (1+ l)))) | |
77 | ||
78 | (defun standard-display-ascii (c s) | |
79 | "Display character C using string S." | |
80 | (or standard-display-table | |
81 | (setq standard-display-table (make-vector 261 nil))) | |
82 | (aset standard-display-table c (apply 'make-rope (append s nil)))) | |
83 | ||
84 | (defun standard-display-g1 (c sc) | |
85 | "Display character C as character SC in the g1 character set." | |
86 | (or standard-display-table | |
87 | (setq standard-display-table (make-vector 261 nil))) | |
88 | (aset standard-display-table c | |
03131799 | 89 | (make-rope (create-glyph (concat "\016" (char-to-string sc) "\017"))))) |
a2535589 JA |
90 | |
91 | (defun standard-display-graphic (c gc) | |
92 | "Display character C as character GC in graphics character set." | |
93 | (or standard-display-table | |
94 | (setq standard-display-table (make-vector 261 nil))) | |
95 | (aset standard-display-table c | |
03131799 | 96 | (make-rope (create-glyph (concat "\e(0" (char-to-string gc) "\e(B"))))) |
a2535589 JA |
97 | |
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 | |
03131799 RS |
103 | (make-rope (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m"))))) |
104 | ||
105 | ;; Allocate a glyph code to display by sending STRING to the terminal. | |
106 | (defun create-glyph (string) | |
107 | (if (= (length glyph-table) 65536) | |
108 | (error "No free glyph codes remain")) | |
109 | (setq glyph-table (vconcat glyph-table (list string))) | |
110 | (1- (length glyph-table))) | |
a2535589 JA |
111 | |
112 | (provide 'disp-table) | |
c0274f38 ER |
113 | |
114 | ;;; disp-table.el ends here |