1;;; disp-table.el --- functions for dealing with char tables 2 3;; Copyright (C) 1987, 1994, 1995, 1999, 2001, 2002, 2003, 2004, 4;; 2005, 2006, 2007 Free Software Foundation, Inc. 5 6;; Author: Erik Naggum <erik@naggum.no> 7;; Based on a previous version by Howard Gayle 8;; Maintainer: FSF 9;; Keywords: i18n 10 11;; This file is part of GNU Emacs. 12 13;; GNU Emacs is free software; you can redistribute it and/or modify 14;; it under the terms of the GNU General Public License as published by 15;; the Free Software Foundation; either version 2, or (at your option) 16;; any later version. 17 18;; GNU Emacs is distributed in the hope that it will be useful, 19;; but WITHOUT ANY WARRANTY; without even the implied warranty of 20;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21;; GNU General Public License for more details. 22 23;; You should have received a copy of the GNU General Public License 24;; along with GNU Emacs; see the file COPYING. If not, write to the 25;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 26;; Boston, MA 02110-1301, USA. 27 28;;; Commentary: 29 30;;; Code: 31 32(put 'display-table 'char-table-extra-slots 6) 33 34;;;###autoload 35(defun make-display-table () 36 "Return a new, empty display table." 37 (make-char-table 'display-table nil)) 38 39(or standard-display-table 40 (setq standard-display-table (make-display-table))) 41 42;;; Display-table slot names. The property value says which slot. 43 44(put 'truncation 'display-table-slot 0) 45(put 'wrap 'display-table-slot 1) 46(put 'escape 'display-table-slot 2) 47(put 'control 'display-table-slot 3) 48(put 'selective-display 'display-table-slot 4) 49(put 'vertical-border 'display-table-slot 5) 50 51;;;###autoload 52(defun display-table-slot (display-table slot) 53 "Return the value of the extra slot in DISPLAY-TABLE named SLOT. 54SLOT may be a number from 0 to 5 inclusive, or a slot name (symbol). 55Valid symbols are `truncation', `wrap', `escape', `control', 56`selective-display', and `vertical-border'." 57 (let ((slot-number 58 (if (numberp slot) slot 59 (or (get slot 'display-table-slot) 60 (error "Invalid display-table slot name: %s" slot))))) 61 (char-table-extra-slot display-table slot-number))) 62 63;;;###autoload 64(defun set-display-table-slot (display-table slot value) 65 "Set the value of the extra slot in DISPLAY-TABLE named SLOT to VALUE. 66SLOT may be a number from 0 to 5 inclusive, or a name (symbol). 67Valid symbols are `truncation', `wrap', `escape', `control', 68`selective-display', and `vertical-border'." 69 (let ((slot-number 70 (if (numberp slot) slot 71 (or (get slot 'display-table-slot) 72 (error "Invalid display-table slot name: %s" slot))))) 73 (set-char-table-extra-slot display-table slot-number value))) 74 75;;;###autoload 76(defun describe-display-table (dt) 77 "Describe the display table DT in a help buffer." 78 (with-output-to-temp-buffer "*Help*" 79 (princ "\nTruncation glyph: ") 80 (prin1 (display-table-slot dt 'truncation)) 81 (princ "\nWrap glyph: ") 82 (prin1 (display-table-slot dt 'wrap)) 83 (princ "\nEscape glyph: ") 84 (prin1 (display-table-slot dt 'escape)) 85 (princ "\nCtrl glyph: ") 86 (prin1 (display-table-slot dt 'control)) 87 (princ "\nSelective display glyph sequence: ") 88 (prin1 (display-table-slot dt 'selective-display)) 89 (princ "\nVertical window border glyph: ") 90 (prin1 (display-table-slot dt 'vertical-border)) 91 (princ "\nCharacter display glyph sequences:\n") 92 (save-excursion 93 (set-buffer standard-output) 94 (let ((vector (make-vector 256 nil)) 95 (i 0)) 96 (while (< i 256) 97 (aset vector i (aref dt i)) 98 (setq i (1+ i))) 99 (describe-vector vector)) 100 (help-mode)) 101 (print-help-return-message))) 102 103;;;###autoload 104(defun describe-current-display-table () 105 "Describe the display table in use in the selected window and buffer." 106 (interactive) 107 (let ((disptab (or (window-display-table (selected-window)) 108 buffer-display-table 109 standard-display-table))) 110 (if disptab 111 (describe-display-table disptab) 112 (message "No display table")))) 113 114;;;###autoload 115(defun standard-display-8bit (l h) 116 "Display characters in the range L to H literally." 117 (or standard-display-table 118 (setq standard-display-table (make-display-table))) 119 (while (<= l h) 120 (aset standard-display-table l (if (or (< l ?\s) (>= l 127)) (vector l))) 121 (setq l (1+ l)))) 122 123;;;###autoload 124(defun standard-display-default (l h) 125 "Display characters in the range L to H using the default notation." 126 (or standard-display-table 127 (setq standard-display-table (make-display-table))) 128 (while (<= l h) 129 (if (and (>= l ?\s) (char-valid-p l)) 130 (aset standard-display-table l nil)) 131 (setq l (1+ l)))) 132 133;; This function does NOT take terminal-dependent escape sequences. 134;; For that, you need to go through create-glyph. Use one of the 135;; other functions below, or roll your own. 136;;;###autoload 137(defun standard-display-ascii (c s) 138 "Display character C using printable string S." 139 (or standard-display-table 140 (setq standard-display-table (make-display-table))) 141 (aset standard-display-table c (vconcat s))) 142 143;;;###autoload 144(defun standard-display-g1 (c sc) 145 "Display character C as character SC in the g1 character set. 146This function assumes that your terminal uses the SO/SI characters; 147it is meaningless for an X frame." 148 (if (memq window-system '(x w32 mac)) 149 (error "Cannot use string glyphs in a windowing system")) 150 (or standard-display-table 151 (setq standard-display-table (make-display-table))) 152 (aset standard-display-table c 153 (vector (create-glyph (concat "\016" (char-to-string sc) "\017"))))) 154 155;;;###autoload 156(defun standard-display-graphic (c gc) 157 "Display character C as character GC in graphics character set. 158This function assumes VT100-compatible escapes; it is meaningless for an 159X frame." 160 (if (memq window-system '(x w32 mac)) 161 (error "Cannot use string glyphs in a windowing system")) 162 (or standard-display-table 163 (setq standard-display-table (make-display-table))) 164 (aset standard-display-table c 165 (vector (create-glyph (concat "\e(0" (char-to-string gc) "\e(B"))))) 166 167;;;###autoload 168(defun standard-display-underline (c uc) 169 "Display character C as character UC plus underlining." 170 (or standard-display-table 171 (setq standard-display-table (make-display-table))) 172 (aset standard-display-table c 173 (vector 174 (if window-system 175 (make-glyph-code uc 'underline) 176 (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m")))))) 177 178;;;###autoload 179(defun create-glyph (string) 180 "Allocate a glyph code to display by sending STRING to the terminal." 181 (if (= (length glyph-table) 65536) 182 (error "No free glyph codes remain")) 183 ;; Don't use slots that correspond to ASCII characters. 184 (if (= (length glyph-table) 32) 185 (setq glyph-table (vconcat glyph-table (make-vector 224 nil)))) 186 (setq glyph-table (vconcat glyph-table (list string))) 187 (1- (length glyph-table))) 188 189;;;###autoload 190(defun make-glyph-code (char &optional face) 191 "Return a glyph code representing char CHAR with face FACE." 192 ;; Due to limitations on Emacs integer values, faces with 193 ;; face id greater that 4091 are silently ignored. 194 (if (and face (<= (face-id face) #xfff)) 195 (logior char (lsh (face-id face) 19)) 196 char)) 197 198;;;###autoload 199(defun glyph-char (glyph) 200 "Return the character of glyph code GLYPH." 201 (logand glyph #x7ffff)) 202 203;;;###autoload 204(defun glyph-face (glyph) 205 "Return the face of glyph code GLYPH, or nil if glyph has default face." 206 (let ((face-id (lsh glyph -19))) 207 (and (> face-id 0) 208 (car (delq nil (mapcar (lambda (face) 209 (and (eq (get face 'face) face-id) 210 face)) 211 (face-list))))))) 212 213;;;###autoload 214(defun standard-display-european (arg) 215 "Semi-obsolete way to toggle display of ISO 8859 European characters. 216 217This function is semi-obsolete; if you want to do your editing with 218unibyte characters, it is better to `set-language-environment' coupled 219with either the `--unibyte' option or the EMACS_UNIBYTE environment 220variable, or else customize `enable-multibyte-characters'. 221 222With prefix argument, this command enables European character display 223if arg is positive, disables it otherwise. Otherwise, it toggles 224European character display. 225 226When this mode is enabled, characters in the range of 160 to 255 227display not as octal escapes, but as accented characters. Codes 146 228and 160 display as apostrophe and space, even though they are not the 229ASCII codes for apostrophe and space. 230 231Enabling European character display with this command noninteractively 232from Lisp code also selects Latin-1 as the language environment, and 233selects unibyte mode for all Emacs buffers \(both existing buffers and 234those created subsequently). This provides increased compatibility 235for users who call this function in `.emacs'." 236 237 (if (or (<= (prefix-numeric-value arg) 0) 238 (and (null arg) 239 (char-table-p standard-display-table) 240 ;; Test 161, because 160 displays as a space. 241 (equal (aref standard-display-table 161) [161]))) 242 (progn 243 (standard-display-default 160 255) 244 (unless (or (memq window-system '(x w32 mac))) 245 (and (terminal-coding-system) 246 (set-terminal-coding-system nil)))) 247 248 (display-warning 'i18n 249 "`standard-display-european' is semi-obsolete; see its doc string for details" 250 :warning) 251 252 ;; Switch to Latin-1 language environment 253 ;; unless some other has been specified. 254 (if (equal current-language-environment "English") 255 (set-language-environment "latin-1")) 256 (unless (or noninteractive (memq window-system '(x w32 mac))) 257 ;; Send those codes literally to a character-based terminal. 258 ;; If we are using single-byte characters, 259 ;; it doesn't matter which coding system we use. 260 (set-terminal-coding-system 261 (let ((c (intern (downcase current-language-environment)))) 262 (if (coding-system-p c) c 'latin-1)))) 263 (standard-display-european-internal))) 264 265(provide 'disp-table) 266 267;;; arch-tag: ffe4c28c-960c-47aa-b8a8-ae89d371ffc7 268;;; disp-table.el ends here 269