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199 lines
7.1 KiB
EmacsLisp
199 lines
7.1 KiB
EmacsLisp
;;; disp-table.el --- functions for dealing with char tables.
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;; Copyright (C) 1987, 1994, 1995 Free Software Foundation, Inc.
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;; Author: Erik Naggum <erik@naggum.no>
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;; Based on a previous version by Howard Gayle
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;; Maintainer: FSF
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;; Keywords: i18n
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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 the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Code:
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(put 'display-table 'char-table-extra-slots 6)
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;;;###autoload
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(defun make-display-table ()
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"Return a new, empty display table."
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(make-char-table 'display-table nil))
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(or standard-display-table
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(setq standard-display-table (make-display-table)))
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;;; Display-table slot names. The property value says which slot.
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(put 'truncation 'display-table-slot 0)
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(put 'wrap 'display-table-slot 1)
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(put 'escape 'display-table-slot 2)
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(put 'control 'display-table-slot 3)
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(put 'selective-display 'display-table-slot 4)
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(put 'vertical-border 'display-table-slot 5)
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;;;###autoload
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(defun display-table-slot (display-table slot)
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"Return the value of the extra slot in DISPLAY-TABLE named SLOT.
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SLOT may be a number from 0 to 5 inclusive, or a slot name (symbol).
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Valid symbols are `truncation', `wrap', `escape', `control',
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`selective-display', and `vertical-border'."
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(let ((slot-number
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(if (numberp slot) slot
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(or (get slot 'display-table-slot)
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(error "Invalid display-table slot name: %s" slot)))))
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(char-table-extra-slot display-table slot-number)))
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;;;###autoload
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(defun set-display-table-slot (display-table slot value)
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"Set the value of the extra slot in DISPLAY-TABLE named SLOT to VALUE.
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SLOT may be a number from 0 to 5 inclusive, or a name (symbol).
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Valid symbols are `truncation', `wrap', `escape', `control',
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`selective-display', and `vertical-border'."
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(let ((slot-number
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(if (numberp slot) slot
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(or (get slot 'display-table-slot)
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(error "Invalid display-table slot name: %s" slot)))))
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(set-char-table-extra-slot display-table slot-number value)))
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;;;###autoload
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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 (display-table-slot dt 'truncation))
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(princ "\nWrap glyph: ")
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(prin1 (display-table-slot dt 'wrap))
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(princ "\nEscape glyph: ")
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(prin1 (display-table-slot dt 'escape))
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(princ "\nCtrl glyph: ")
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(prin1 (display-table-slot dt 'control))
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(princ "\nSelective display glyph sequence: ")
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(prin1 (display-table-slot dt 'selective-display))
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(princ "\nVertical window border glyph: ")
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(prin1 (display-table-slot dt 'vertical-border))
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(princ "\nCharacter display glyph sequences:\n")
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(save-excursion
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(set-buffer standard-output)
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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 (aref dt i))
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(setq i (1+ i)))
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(describe-vector vector))
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(help-mode))
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(print-help-return-message)))
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;;;###autoload
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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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(let ((disptab (or (window-display-table (selected-window))
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buffer-display-table
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standard-display-table)))
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(if disptab
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(describe-display-table disptab)
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(message "No display table"))))
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;;;###autoload
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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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(aset standard-display-table l nil)
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(aset standard-display-table l (vector l)))
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(setq l (1+ l))))
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;;;###autoload
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(defun standard-display-default (l h)
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"Display characters in the range L to H using the default notation."
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(while (<= l h)
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(if (and (>= l ?\ ) (< l 127))
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(aset standard-display-table l nil)
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(aset standard-display-table l nil))
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(setq l (1+ l))))
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;; This function does NOT take terminal-dependent escape sequences.
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;; For that, you need to go through create-glyph. Use one of the
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;; other functions below, or roll your own.
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;;;###autoload
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(defun standard-display-ascii (c s)
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"Display character C using printable string S."
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(aset standard-display-table c (vconcat s)))
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;;;###autoload
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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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This function assumes that your terminal uses the SO/SI characters;
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it is meaningless for an X frame."
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(if window-system
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(error "Cannot use string glyphs in a windowing system"))
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(aset standard-display-table c
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(vector (create-glyph (concat "\016" (char-to-string sc) "\017")))))
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;;;###autoload
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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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This function assumes VT100-compatible escapes; it is meaningless for an
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X frame."
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(if window-system
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(error "Cannot use string glyphs in a windowing system"))
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(aset standard-display-table c
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(vector (create-glyph (concat "\e(0" (char-to-string gc) "\e(B")))))
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;;;###autoload
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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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(if window-system (require 'faces))
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(aset standard-display-table c
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(vector
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(if window-system
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(logior uc (lsh (face-id (internal-find-face 'underline)) 8))
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(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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;;;###autoload
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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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;; Don't use slots that correspond to ASCII characters.
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(if (= (length glyph-table) 32)
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(setq glyph-table (vconcat glyph-table (make-vector 224 nil))))
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(setq glyph-table (vconcat glyph-table (list string)))
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(1- (length glyph-table)))
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;;;###autoload
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(defun standard-display-european (arg)
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"Toggle display of European characters encoded with ISO 8859.
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When enabled, characters in the range of 160 to 255 display not
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as octal escapes, but as accented characters.
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With prefix argument, enable European character display iff arg is positive."
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(interactive "P")
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(if (or (<= (prefix-numeric-value arg) 0)
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(and (null arg)
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(char-table-p standard-display-table)
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;; Test 161, because 160 displays as a space.
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(equal (aref standard-display-table 161) [161])))
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(standard-display-default 160 255)
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(standard-display-8bit 160 255)
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;; Make non-line-break space display as a plain space.
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;; Most X fonts do the wrong thing for code 160.
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(aset standard-display-table 160 [32])))
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(provide 'disp-table)
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;;; disp-table.el ends here
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