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c0274f38 ER |
1 | ;;; disp-table.el --- functions for dealing with char tables. |
2 | ||
ef9c36a5 | 3 | ;; Copyright (C) 1987, 1994, 1995 Free Software Foundation, Inc. |
9750e079 | 4 | |
ef9c36a5 EN |
5 | ;; Author: Erik Naggum <erik@naggum.no> |
6 | ;; Based on a previous version by Howard Gayle | |
e5167999 | 7 | ;; Maintainer: FSF |
a1d15b3e | 8 | ;; Keywords: i18n |
a2535589 JA |
9 | |
10 | ;; This file is part of GNU Emacs. | |
11 | ||
12 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
13 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 14 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
15 | ;; any later version. |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
24 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | ||
e5167999 | 26 | ;;; Code: |
a2535589 | 27 | |
963fd070 | 28 | (put 'display-table 'char-table-extra-slots 6) |
dc5a82ea | 29 | |
ef9c36a5 EN |
30 | ;;;###autoload |
31 | (defun make-display-table () | |
32 | "Return a new, empty display table." | |
963fd070 | 33 | (make-char-table 'display-table nil)) |
ef9c36a5 EN |
34 | |
35 | (or standard-display-table | |
36 | (setq standard-display-table (make-display-table))) | |
37 | ||
963fd070 RS |
38 | ;;; Display-table slot names. The property value says which slot. |
39 | ||
40 | (put 'truncation 'display-table-slot 0) | |
41 | (put 'wrap 'display-table-slot 1) | |
42 | (put 'escape 'display-table-slot 2) | |
43 | (put 'control 'display-table-slot 3) | |
44 | (put 'selective-display 'display-table-slot 4) | |
45 | (put 'vertical-border 'display-table-slot 5) | |
ef9c36a5 EN |
46 | |
47 | ;;;###autoload | |
48 | (defun display-table-slot (display-table slot) | |
49 | "Return the value of the extra slot in DISPLAY-TABLE named SLOT. | |
12c9fbcc EN |
50 | SLOT may be a number from 0 to 5 inclusive, or a slot name (symbol). |
51 | Valid symbols are `truncation', `wrap', `escape', `control', | |
52 | `selective-display', and `vertical-border'." | |
ef9c36a5 EN |
53 | (let ((slot-number |
54 | (if (numberp slot) slot | |
963fd070 | 55 | (or (get slot 'display-table-slot) |
ef9c36a5 EN |
56 | (error "Invalid display-table slot name: %s" slot))))) |
57 | (char-table-extra-slot display-table slot-number))) | |
58 | ||
59 | ;;;###autoload | |
60 | (defun set-display-table-slot (display-table slot value) | |
61 | "Set the value of the extra slot in DISPLAY-TABLE named SLOT to VALUE. | |
62 | SLOT may be a number from 0 to 5 inclusive, or a name (symbol). | |
12c9fbcc EN |
63 | Valid symbols are `truncation', `wrap', `escape', `control', |
64 | `selective-display', and `vertical-border'." | |
963fd070 RS |
65 | (let ((slot-number |
66 | (if (numberp slot) slot | |
67 | (or (get slot 'display-table-slot) | |
68 | (error "Invalid display-table slot name: %s" slot))))) | |
69 | (set-char-table-extra-slot display-table slot-number value))) | |
ef9c36a5 EN |
70 | |
71 | ;;;###autoload | |
e31b61e6 | 72 | (defun describe-display-table (dt) |
49116ac0 | 73 | "Describe the display table DT in a help buffer." |
a2535589 | 74 | (with-output-to-temp-buffer "*Help*" |
03131799 | 75 | (princ "\nTruncation glyph: ") |
963fd070 | 76 | (prin1 (display-table-slot dt 'truncation)) |
03131799 | 77 | (princ "\nWrap glyph: ") |
963fd070 | 78 | (prin1 (display-table-slot dt 'wrap)) |
03131799 | 79 | (princ "\nEscape glyph: ") |
963fd070 | 80 | (prin1 (display-table-slot dt 'escape)) |
03131799 | 81 | (princ "\nCtrl glyph: ") |
963fd070 | 82 | (prin1 (display-table-slot dt 'control)) |
afb1e4b4 | 83 | (princ "\nSelective display glyph sequence: ") |
963fd070 | 84 | (prin1 (display-table-slot dt 'selective-display)) |
dc5a82ea | 85 | (princ "\nVertical window border glyph: ") |
963fd070 | 86 | (prin1 (display-table-slot dt 'vertical-border)) |
afb1e4b4 | 87 | (princ "\nCharacter display glyph sequences:\n") |
bb6066c8 RS |
88 | (save-excursion |
89 | (set-buffer standard-output) | |
90 | (let ((vector (make-vector 256 nil)) | |
91 | (i 0)) | |
92 | (while (< i 256) | |
93 | (aset vector i (aref dt i)) | |
94 | (setq i (1+ i))) | |
5d74f2a6 KH |
95 | (describe-vector vector)) |
96 | (help-mode)) | |
a2535589 JA |
97 | (print-help-return-message))) |
98 | ||
e31b61e6 | 99 | ;;;###autoload |
a2535589 | 100 | (defun describe-current-display-table () |
bb6066c8 RS |
101 | "Describe the display table in use in the selected window and buffer." |
102 | (interactive) | |
ef9c36a5 EN |
103 | (let ((disptab (or (window-display-table (selected-window)) |
104 | buffer-display-table | |
105 | standard-display-table))) | |
bb6066c8 RS |
106 | (if disptab |
107 | (describe-display-table disptab) | |
108 | (message "No display table")))) | |
a2535589 | 109 | |
e31b61e6 | 110 | ;;;###autoload |
a2535589 | 111 | (defun standard-display-8bit (l h) |
49116ac0 | 112 | "Display characters in the range L to H literally." |
a2535589 JA |
113 | (while (<= l h) |
114 | (if (and (>= l ?\ ) (< l 127)) | |
ef9c36a5 | 115 | (aset standard-display-table l nil) |
afb1e4b4 | 116 | (aset standard-display-table l (vector l))) |
a2535589 JA |
117 | (setq l (1+ l)))) |
118 | ||
798aa8d0 JB |
119 | ;;;###autoload |
120 | (defun standard-display-default (l h) | |
121 | "Display characters in the range L to H using the default notation." | |
122 | (while (<= l h) | |
123 | (if (and (>= l ?\ ) (< l 127)) | |
ef9c36a5 | 124 | (aset standard-display-table l nil) |
798aa8d0 JB |
125 | (aset standard-display-table l nil)) |
126 | (setq l (1+ l)))) | |
127 | ||
a171458a KH |
128 | ;; This function does NOT take terminal-dependent escape sequences. |
129 | ;; For that, you need to go through create-glyph. Use one of the | |
130 | ;; other functions below, or roll your own. | |
ef9c36a5 | 131 | ;;;###autoload |
a2535589 | 132 | (defun standard-display-ascii (c s) |
a171458a | 133 | "Display character C using printable string S." |
ef9c36a5 | 134 | (aset standard-display-table c (vconcat s))) |
a2535589 | 135 | |
e31b61e6 | 136 | ;;;###autoload |
a2535589 | 137 | (defun standard-display-g1 (c sc) |
de7d5cb6 KH |
138 | "Display character C as character SC in the g1 character set. |
139 | This function assumes that your terminal uses the SO/SI characters; | |
140 | it is meaningless for an X frame." | |
141 | (if window-system | |
142 | (error "Cannot use string glyphs in a windowing system")) | |
a2535589 | 143 | (aset standard-display-table c |
82093c70 | 144 | (vector (create-glyph (concat "\016" (char-to-string sc) "\017"))))) |
a2535589 | 145 | |
e31b61e6 | 146 | ;;;###autoload |
a2535589 | 147 | (defun standard-display-graphic (c gc) |
de7d5cb6 KH |
148 | "Display character C as character GC in graphics character set. |
149 | This function assumes VT100-compatible escapes; it is meaningless for an | |
150 | X frame." | |
151 | (if window-system | |
152 | (error "Cannot use string glyphs in a windowing system")) | |
a2535589 | 153 | (aset standard-display-table c |
82093c70 | 154 | (vector (create-glyph (concat "\e(0" (char-to-string gc) "\e(B"))))) |
a2535589 | 155 | |
e31b61e6 | 156 | ;;;###autoload |
a2535589 JA |
157 | (defun standard-display-underline (c uc) |
158 | "Display character C as character UC plus underlining." | |
de7d5cb6 | 159 | (if window-system (require 'faces)) |
a2535589 | 160 | (aset standard-display-table c |
de7d5cb6 KH |
161 | (vector |
162 | (if window-system | |
163 | (logior uc (lsh (face-id (internal-find-face 'underline)) 8)) | |
164 | (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m")))))) | |
03131799 RS |
165 | |
166 | ;; Allocate a glyph code to display by sending STRING to the terminal. | |
e31b61e6 | 167 | ;;;###autoload |
03131799 RS |
168 | (defun create-glyph (string) |
169 | (if (= (length glyph-table) 65536) | |
170 | (error "No free glyph codes remain")) | |
03fd83c5 KH |
171 | ;; Don't use slots that correspond to ASCII characters. |
172 | (if (= (length glyph-table) 32) | |
173 | (setq glyph-table (vconcat glyph-table (make-vector 224 nil)))) | |
03131799 RS |
174 | (setq glyph-table (vconcat glyph-table (list string))) |
175 | (1- (length glyph-table))) | |
a2535589 | 176 | |
2eae7226 | 177 | ;;;###autoload |
798aa8d0 | 178 | (defun standard-display-european (arg) |
2eae7226 JB |
179 | "Toggle display of European characters encoded with ISO 8859. |
180 | When enabled, characters in the range of 160 to 255 display not | |
181 | as octal escapes, but as accented characters. | |
182 | With prefix argument, enable European character display iff arg is positive." | |
798aa8d0 | 183 | (interactive "P") |
c3a14a2b | 184 | (if (or (<= (prefix-numeric-value arg) 0) |
2eae7226 | 185 | (and (null arg) |
ef9c36a5 | 186 | (char-table-p standard-display-table) |
55f5abaf | 187 | ;; Test 161, because 160 displays as a space. |
e470e6f0 | 188 | (equal (aref standard-display-table 161) [161]))) |
2eae7226 | 189 | (standard-display-default 160 255) |
55f5abaf RS |
190 | (standard-display-8bit 160 255) |
191 | ;; Make non-line-break space display as a plain space. | |
192 | ;; Most X fonts do the wrong thing for code 160. | |
193 | (aset standard-display-table 160 [32]))) | |
798aa8d0 | 194 | |
a2535589 | 195 | (provide 'disp-table) |
c0274f38 ER |
196 | |
197 | ;;; disp-table.el ends here |