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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 | ||
22 | ;; Written by Howard Gayle. See case-table.el for details. | |
23 | ||
24 | (require 'case-table) | |
25 | ||
26 | (defun rope-to-vector (rope) | |
27 | (let* ((len (/ (length rope) 2)) | |
28 | (vector (make-vector len nil)) | |
29 | (i 0)) | |
30 | (while (< i len) | |
31 | (aset vector i (rope-elt rope i)) | |
32 | (setq i (1+ i))))) | |
33 | ||
34 | (defun describe-display-table (DT) | |
49116ac0 | 35 | "Describe the display table DT in a help buffer." |
a2535589 JA |
36 | (with-output-to-temp-buffer "*Help*" |
37 | (princ "\nTruncation glyf: ") | |
38 | (prin1 (aref dt 256)) | |
39 | (princ "\nWrap glyf: ") | |
40 | (prin1 (aref dt 257)) | |
41 | (princ "\nEscape glyf: ") | |
42 | (prin1 (aref dt 258)) | |
43 | (princ "\nCtrl glyf: ") | |
44 | (prin1 (aref dt 259)) | |
45 | (princ "\nSelective display rope: ") | |
46 | (prin1 (rope-to-vector (aref dt 260))) | |
47 | (princ "\nCharacter display ropes:\n") | |
48 | (let ((vector (make-vector 256 nil)) | |
49 | (i 0)) | |
50 | (while (< i 256) | |
51 | (aset vector i | |
52 | (if (stringp (aref dt i)) | |
53 | (rope-to-vector (aref dt i)) | |
54 | (aref dt i))) | |
55 | (setq i (1+ i))) | |
56 | (describe-vector vector)) | |
57 | (print-help-return-message))) | |
58 | ||
59 | (defun describe-current-display-table () | |
49116ac0 | 60 | "Describe the display table in use in the selected window and buffer." |
a2535589 JA |
61 | (interactive) |
62 | (describe-display-table | |
63 | (or (window-display-table (selected-window)) | |
64 | buffer-display-table | |
65 | standard-display-table))) | |
66 | ||
67 | (defun make-display-table () | |
68 | (make-vector 261 nil)) | |
69 | ||
70 | (defun standard-display-8bit (l h) | |
49116ac0 | 71 | "Display characters in the range L to H literally." |
a2535589 JA |
72 | (while (<= l h) |
73 | (if (and (>= l ?\ ) (< l 127)) | |
74 | (if standard-display-table (aset standard-display-table l nil)) | |
75 | (or standard-display-table | |
76 | (setq standard-display-table (make-vector 261 nil))) | |
77 | (aset standard-display-table l l)) | |
78 | (setq l (1+ l)))) | |
79 | ||
80 | (defun standard-display-ascii (c s) | |
81 | "Display character C using string S." | |
82 | (or standard-display-table | |
83 | (setq standard-display-table (make-vector 261 nil))) | |
84 | (aset standard-display-table c (apply 'make-rope (append s nil)))) | |
85 | ||
86 | (defun standard-display-g1 (c sc) | |
87 | "Display character C as character SC in the g1 character set." | |
88 | (or standard-display-table | |
89 | (setq standard-display-table (make-vector 261 nil))) | |
90 | (aset standard-display-table c | |
91 | (make-rope (create-glyf (concat "\016" (char-to-string sc) "\017"))))) | |
92 | ||
93 | (defun standard-display-graphic (c gc) | |
94 | "Display character C as character GC in graphics character set." | |
95 | (or standard-display-table | |
96 | (setq standard-display-table (make-vector 261 nil))) | |
97 | (aset standard-display-table c | |
98 | (make-rope (create-glyf (concat "\e(0" (char-to-string gc) "\e(B"))))) | |
99 | ||
100 | (defun standard-display-underline (c uc) | |
101 | "Display character C as character UC plus underlining." | |
102 | (or standard-display-table | |
103 | (setq standard-display-table (make-vector 261 nil))) | |
104 | (aset standard-display-table c | |
105 | (make-rope (create-glyf (concat "\e[4m" (char-to-string uc) "\e[m"))))) | |
106 | ||
107 | (defun create-glyf (string) | |
108 | (let ((i 256)) | |
109 | (while (and (< i 65536) (aref glyf-table i) | |
110 | (not (string= (aref glyf-table i) string))) | |
111 | (setq i (1+ i))) | |
112 | (if (= i 65536) | |
113 | (error "No free glyf codes remain")) | |
114 | (aset glyf-table i string))) | |
115 | ||
116 | (provide 'disp-table) | |
c0274f38 ER |
117 | |
118 | ;;; disp-table.el ends here |