Variable: rot13-display-table

rot13-display-table is a variable defined in rot13.el.gz.

Value

#^[nil nil display-table
       #^^[3 0 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
	     [78]
	     [79]
	     [80]
	     [81]
	     [82]
	     [83]
	     [84]
	     [85]
	     [86]
	     [87]
	     [88]
	     [89]
	     [90]
	     [65]
	     [66]
	     [67]
	     [68]
	     [69]
	     [70]
	     [71]
	     [72]
	     [73]
	     [74]
	     [75]
	     [76]
	     [77]
	     nil nil nil nil nil nil
	     [110]
	     [111]
	     [112]
	     [113]
	     [114]
	     [115]
	     [116]
	     [117]
	     [118]
	     [119]
	     [120]
	     [121]
	     [122]
	     [97]
	     [98]
	     [99]
	     [100]
	     [101]
	     [102]
	     [103]
	     [104]
	     [105]
	     [106]
	     [107]
	     [108]
	     [109]
	     nil nil nil nil nil]
       #^^[1 0
	     #^^[2 0
		   #^^[3 0 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil
			 [78]
			 [79]
			 [80]
			 [81]
			 [82]
			 [83]
			 [84]
			 [85]
			 [86]
			 [87]
			 [88]
			 [89]
			 [90]
			 [65]
			 [66]
			 [67]
			 [68]
			 [69]
			 [70]
			 [71]
			 [72]
			 [73]
			 [74]
			 [75]
			 [76]
			 [77]
			 nil nil nil nil nil nil
			 [110]
			 [111]
			 [112]
			 [113]
			 [114]
			 [115]
			 [116]
			 [117]
			 [118]
			 [119]
			 [120]
			 [121]
			 [122]
			 [97]
			 [98]
			 [99]
			 [100]
			 [101]
			 [102]
			 [103]
			 [104]
			 [105]
			 [106]
			 [107]
			 [108]
			 [109]
			 nil nil nil nil nil]
		   nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil]
	     nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil]
       nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil]

Documentation

Char table for ROT13 display.

Source Code

;; Defined in /usr/src/emacs/lisp/rot13.el.gz
;;; rot13.el --- display a buffer in ROT13  -*- lexical-binding: t -*-

;; Copyright (C) 1988, 2001-2024 Free Software Foundation, Inc.

;; Author: Howard Gayle
;;         Simon Josefsson
;; Maintainer: emacs-devel@gnu.org

;; 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 3 of the License, 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.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;;   "ROT13 ('rotate by 13 places') is a simple letter substitution
;;   cipher that replaces a letter with the 13th letter after it in
;;   the alphabet.  ROT13 is a special case of the Caesar cipher
;;   which was developed in ancient Rome.
;;
;;   Because there are 26 letters (2×13) in the basic Latin
;;   alphabet, ROT13 is its own inverse; that is, to undo ROT13, the
;;   same algorithm is applied, so the same action can be used for
;;   encoding and decoding.  The algorithm provides virtually no
;;   cryptographic security, and is often cited as a canonical
;;   example of weak encryption.
;;
;;   ROT13 is used in online forums as a means of hiding spoilers,
;;   punchlines, puzzle solutions, and offensive materials from the
;;   casual glance."                      - Wikipedia article on ROT13
;;
;; The entry points, `rot13', `rot13-string', and `rot13-region' performs ROT13
;; encoding/decoding on buffers and strings.  The entry point
;; `rot13-other-window' performs a ROT13 encoding/decoding on the current
;; buffer and displays the result in another window.

;;; Code:

(defconst rot13-display-table
  (let ((table (make-display-table)))
    (dotimes (i 26)
      (aset table (+ i ?a) (vector (+ (% (+ i 13) 26) ?a)))
      (aset table (+ i ?A) (vector (+ (% (+ i 13) 26) ?A))))
    table)
  "Char table for ROT13 display.")