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