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118 lines
3.9 KiB
EmacsLisp
118 lines
3.9 KiB
EmacsLisp
;;; disp-table.el --- functions for dealing with char tables.
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;; Copyright (C) 1987 Free Software Foundation, Inc.
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;; Author: Howard Gayle
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;; Maintainer: FSF
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;; Keywords: i14n
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Code:
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(defun rope-to-vector (rope)
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(let* ((len (/ (length rope) 2))
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(vector (make-vector len nil))
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(i 0))
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(while (< i len)
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(aset vector i (rope-elt rope i))
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(setq i (1+ i)))))
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(defun describe-display-table (DT)
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"Describe the display table DT in a help buffer."
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(with-output-to-temp-buffer "*Help*"
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(princ "\nTruncation glyph: ")
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(prin1 (aref dt 256))
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(princ "\nWrap glyph: ")
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(prin1 (aref dt 257))
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(princ "\nEscape glyph: ")
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(prin1 (aref dt 258))
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(princ "\nCtrl glyph: ")
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(prin1 (aref dt 259))
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(princ "\nSelective display rope: ")
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(prin1 (rope-to-vector (aref dt 260)))
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(princ "\nCharacter display ropes:\n")
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(let ((vector (make-vector 256 nil))
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(i 0))
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(while (< i 256)
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(aset vector i
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(if (stringp (aref dt i))
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(rope-to-vector (aref dt i))
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(aref dt i)))
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(setq i (1+ i)))
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(describe-vector vector))
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(print-help-return-message)))
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(defun describe-current-display-table ()
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"Describe the display table in use in the selected window and buffer."
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(interactive)
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(describe-display-table
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(or (window-display-table (selected-window))
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buffer-display-table
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standard-display-table)))
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(defun make-display-table ()
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(make-vector 261 nil))
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(defun standard-display-8bit (l h)
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"Display characters in the range L to H literally."
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(while (<= l h)
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(if (and (>= l ?\ ) (< l 127))
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(if standard-display-table (aset standard-display-table l nil))
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(or standard-display-table
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(setq standard-display-table (make-vector 261 nil)))
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(aset standard-display-table l l))
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(setq l (1+ l))))
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(defun standard-display-ascii (c s)
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"Display character C using string S."
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(or standard-display-table
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(setq standard-display-table (make-vector 261 nil)))
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(aset standard-display-table c (apply 'make-rope (append s nil))))
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(defun standard-display-g1 (c sc)
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"Display character C as character SC in the g1 character set."
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(or standard-display-table
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(setq standard-display-table (make-vector 261 nil)))
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(aset standard-display-table c
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(make-rope (create-glyph (concat "\016" (char-to-string sc) "\017")))))
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(defun standard-display-graphic (c gc)
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"Display character C as character GC in graphics character set."
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(or standard-display-table
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(setq standard-display-table (make-vector 261 nil)))
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(aset standard-display-table c
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(make-rope (create-glyph (concat "\e(0" (char-to-string gc) "\e(B")))))
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(defun standard-display-underline (c uc)
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"Display character C as character UC plus underlining."
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(or standard-display-table
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(setq standard-display-table (make-vector 261 nil)))
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(aset standard-display-table c
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(make-rope (create-glyph (concat "\e[4m" (char-to-string uc) "\e[m")))))
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;; Allocate a glyph code to display by sending STRING to the terminal.
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(defun create-glyph (string)
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(if (= (length glyph-table) 65536)
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(error "No free glyph codes remain"))
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(setq glyph-table (vconcat glyph-table (list string)))
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(1- (length glyph-table)))
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(provide 'disp-table)
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;;; disp-table.el ends here
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