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a2535589 JA |
1 | ;; Functions for dealing with char tables. |
2 | ;; Copyright (C) 1987 Free Software Foundation, Inc. | |
3 | ||
4 | ;; This file is part of GNU Emacs. | |
5 | ||
6 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
7 | ;; it under the terms of the GNU General Public License as published by | |
8 | ;; the Free Software Foundation; either version 1, or (at your option) | |
9 | ;; any later version. | |
10 | ||
11 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
12 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;; GNU General Public License for more details. | |
15 | ||
16 | ;; You should have received a copy of the GNU General Public License | |
17 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
18 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | ||
20 | ||
21 | ;; Written by Howard Gayle. See case-table.el for details. | |
22 | ||
23 | (require 'case-table) | |
24 | ||
25 | (defun rope-to-vector (rope) | |
26 | (let* ((len (/ (length rope) 2)) | |
27 | (vector (make-vector len nil)) | |
28 | (i 0)) | |
29 | (while (< i len) | |
30 | (aset vector i (rope-elt rope i)) | |
31 | (setq i (1+ i))))) | |
32 | ||
33 | (defun describe-display-table (DT) | |
34 | "Describe the display-table DT in a help buffer." | |
35 | (with-output-to-temp-buffer "*Help*" | |
36 | (princ "\nTruncation glyf: ") | |
37 | (prin1 (aref dt 256)) | |
38 | (princ "\nWrap glyf: ") | |
39 | (prin1 (aref dt 257)) | |
40 | (princ "\nEscape glyf: ") | |
41 | (prin1 (aref dt 258)) | |
42 | (princ "\nCtrl glyf: ") | |
43 | (prin1 (aref dt 259)) | |
44 | (princ "\nSelective display rope: ") | |
45 | (prin1 (rope-to-vector (aref dt 260))) | |
46 | (princ "\nCharacter display ropes:\n") | |
47 | (let ((vector (make-vector 256 nil)) | |
48 | (i 0)) | |
49 | (while (< i 256) | |
50 | (aset vector i | |
51 | (if (stringp (aref dt i)) | |
52 | (rope-to-vector (aref dt i)) | |
53 | (aref dt i))) | |
54 | (setq i (1+ i))) | |
55 | (describe-vector vector)) | |
56 | (print-help-return-message))) | |
57 | ||
58 | (defun describe-current-display-table () | |
59 | "Describe the display-table in use in the selected window and buffer." | |
60 | (interactive) | |
61 | (describe-display-table | |
62 | (or (window-display-table (selected-window)) | |
63 | buffer-display-table | |
64 | standard-display-table))) | |
65 | ||
66 | (defun make-display-table () | |
67 | (make-vector 261 nil)) | |
68 | ||
69 | (defun standard-display-8bit (l h) | |
70 | "Display characters in the range [L, H] literally." | |
71 | (while (<= l h) | |
72 | (if (and (>= l ?\ ) (< l 127)) | |
73 | (if standard-display-table (aset standard-display-table l nil)) | |
74 | (or standard-display-table | |
75 | (setq standard-display-table (make-vector 261 nil))) | |
76 | (aset standard-display-table l l)) | |
77 | (setq l (1+ l)))) | |
78 | ||
79 | (defun standard-display-ascii (c s) | |
80 | "Display character C using string S." | |
81 | (or standard-display-table | |
82 | (setq standard-display-table (make-vector 261 nil))) | |
83 | (aset standard-display-table c (apply 'make-rope (append s nil)))) | |
84 | ||
85 | (defun standard-display-g1 (c sc) | |
86 | "Display character C as character SC in the g1 character set." | |
87 | (or standard-display-table | |
88 | (setq standard-display-table (make-vector 261 nil))) | |
89 | (aset standard-display-table c | |
90 | (make-rope (create-glyf (concat "\016" (char-to-string sc) "\017"))))) | |
91 | ||
92 | (defun standard-display-graphic (c gc) | |
93 | "Display character C as character GC in graphics character set." | |
94 | (or standard-display-table | |
95 | (setq standard-display-table (make-vector 261 nil))) | |
96 | (aset standard-display-table c | |
97 | (make-rope (create-glyf (concat "\e(0" (char-to-string gc) "\e(B"))))) | |
98 | ||
99 | (defun standard-display-underline (c uc) | |
100 | "Display character C as character UC plus underlining." | |
101 | (or standard-display-table | |
102 | (setq standard-display-table (make-vector 261 nil))) | |
103 | (aset standard-display-table c | |
104 | (make-rope (create-glyf (concat "\e[4m" (char-to-string uc) "\e[m"))))) | |
105 | ||
106 | (defun create-glyf (string) | |
107 | (let ((i 256)) | |
108 | (while (and (< i 65536) (aref glyf-table i) | |
109 | (not (string= (aref glyf-table i) string))) | |
110 | (setq i (1+ i))) | |
111 | (if (= i 65536) | |
112 | (error "No free glyf codes remain")) | |
113 | (aset glyf-table i string))) | |
114 | ||
115 | (provide 'disp-table) |