├── LICENSE ├── README.rst ├── TODO.org ├── emacsrepl ├── emacsrepl.el ├── readline.el └── utf8-decode.el /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | 676 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | emacsrepl 2 | ========= 3 | 4 | .. 5 | 6 | About 7 | ----- 8 | 9 | This is madness. Less madness than readline though... 10 | 11 | Usage 12 | ----- 13 | 14 | - ``git clone https://github.com/tetracat/emacsrepl`` 15 | - ``cd emacsrepl`` 16 | - ``./emacsrepl`` 17 | 18 | Features 19 | -------- 20 | 21 | - Basic readline-style editing (duh) 22 | - Runs properly under ``M-x run-lisp`` 23 | - Persistent history 24 | 25 | Wishlist 26 | -------- 27 | 28 | See `TODO.org 29 | `_. 30 | 31 | Further Notes 32 | ------------- 33 | 34 | See the `blog post 35 | `_. 36 | 37 | Credits 38 | ------- 39 | 40 | - `@antirez `_ for writing `linenoise 41 | `_ 42 | - `@ackalker `_ for the shell script 43 | magic and initial Emacs Lisp code 44 | - `@wasamasa `_ for turning the above 45 | into an Emacs REPL 46 | -------------------------------------------------------------------------------- /TODO.org: -------------------------------------------------------------------------------- 1 | * Basics [6/6] 2 | 3 | ** DONE Modularization 4 | 5 | This would allow for a less hacky shell script: 6 | 7 | #+BEGIN_SRC shell 8 | emacs -Q --batch -l foo.el -l bar.el -f repl 9 | #+END_SRC 10 | 11 | Candidates: 12 | 13 | - readline.el 14 | - repl.el 15 | 16 | ** DONE History support 17 | 18 | - Save successful (not cancelled or erroneous) to a history ring 19 | - Recognize =C-p= / == and =C-n= / == 20 | 21 | ** DONE Persistent history 22 | 23 | - Save history to file after quitting 24 | - Load history from file after start 25 | - Support a hardcoded file location 26 | - Support an environment variable 27 | 28 | ** DONE Dumb mode 29 | 30 | Not everything supports our fancy control codes. It would be better 31 | to check =TERM= and disable printing them for dumb terminals. 32 | 33 | ** DONE Support UTF-8 34 | 35 | - Extend the state machine to handle UTF-8 sequences 36 | - Convert a recognized UTF-8 sequence into a multibyte character 37 | - Print multi-byte characters 38 | - Downside: other multi-byte encodings will be turned into even 39 | weirder gibberish than before 40 | 41 | ** DONE Support all linenoise bindings 42 | 43 | - =C-t= (swap previous and current char, advance cursor by one) 44 | - =C-p/C-n= (prev/next history item) 45 | - =C-u= (delete entire line) 46 | - =C-k= (delete to end) 47 | - =C-w= (delete previous word) 48 | 49 | * Nice to have [0/16] 50 | 51 | ** TODO Tests 52 | 53 | Something along the lines of the MAL test file format would be nice to 54 | have, together with some elisp and shell code for ensuring typical 55 | usecases don't mysteriously break down (as it is currently the case 56 | for =M-x ansi-term=). 57 | 58 | ** TODO Install script 59 | 60 | wasamasa: Imo, a better approach is to install the repl component somewhere else, like $PREFIX/lib/emacsrepl/repl.el 61 | wasamasa: Then hardcode that path 62 | Earnestly: so the user would need to edit PREFIX in the shell script? 63 | wasamasa: You'd use a Makefile or some such where they can install it, the PREFIX can be sed'd in during that process 64 | hmm 65 | wasamasa: sed is far nicer for simple stuff, and probably complex stuff, than m4 66 | wasamasa: https://ptpb.pw/gdvL/make all I use for taverner 67 | wasamasa: You could just throw in a sed -i 's/PREFIX/$PREFIX' emacsrepl before the install 68 | wasamasa: It's about as simple as this: https://ptpb.pw/Y9Tv/make 69 | wasamasa: Where script=PREFIX/emacsrepl/repl.el or whatever path you want 70 | Erm, PREFIX/lib/emacsrepl/repl.el 71 | You could even abstrct /lib/ into LIBDIR like gnu autohell does, but I don't care about such opinions 72 | 73 | ** TODO Quoted insert 74 | 75 | ** TODO Bracketed paste 76 | 77 | ** TODO User file 78 | 79 | ** TODO Indentation 80 | 81 | ** TODO Continuation prompts 82 | 83 | ** TODO Multi-line editing 84 | 85 | Currently editing a line longer than the terminal width results in 86 | undefined behaviour, typically printing beyond it will work, but 87 | deleting only affect the visual continuation line... 88 | 89 | Take a look at how the linenoise multi-line algorithm works for this. 90 | 91 | ** TODO Undo 92 | 93 | ** TODO Paredit 94 | 95 | ** TODO Better error messages 96 | 97 | ** TODO Completion 98 | 99 | ** TODO History search 100 | 101 | ** TODO Syntax highlighting 102 | 103 | ** TODO Pretty-printing 104 | 105 | ** TODO "Comma" commands 106 | -------------------------------------------------------------------------------- /emacsrepl: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # emacsrepl - Interactive CLI REPL for Emacs Lisp 3 | 4 | scriptdir=${0%/*} 5 | 6 | repl() { 7 | emacs -Q --batch -L . --load "$scriptdir/emacsrepl.el" 8 | pkill -u "$USER" -P "$$" -x od 9 | } 10 | 11 | case $TERM in 12 | dumb|cons25|emacs) 13 | emacs -Q --batch -L . --load "$scriptdir/emacsrepl.el" 14 | ;; 15 | *) 16 | trap 'stty "$restore"' EXIT 17 | 18 | restore=$(stty -g) 19 | stty raw -echo opost 20 | 21 | stdbuf -oL od -w1 -An -tx1 -v | repl 22 | esac 23 | -------------------------------------------------------------------------------- /emacsrepl.el: -------------------------------------------------------------------------------- 1 | ;; Copyright (C) 2016 Alain Kalker 2 | ;; Copyright (C) 2016 Vasilij Schneidermann 3 | 4 | ;; This file is free software; you can redistribute it and/or modify 5 | ;; it under the terms of the GNU General Public License as published by 6 | ;; the Free Software Foundation; either version 3, or (at your option) 7 | ;; any later version. 8 | 9 | ;; This file is distributed in the hope that it will be useful, 10 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | ;; GNU General Public License for more details. 13 | 14 | ;; You should have received a copy of the GNU General Public License 15 | ;; along with GNU Emacs; see the file COPYING. If not, write to 16 | ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 17 | ;; Boston, MA 02111-1307, USA. 18 | 19 | (require 'readline) 20 | 21 | (defun rep (input) 22 | (let ((form (read input))) 23 | (prin1-to-string (eval form)))) 24 | 25 | (defun emacs-read-line (prompt) 26 | (ignore-errors (read-from-minibuffer prompt))) 27 | 28 | (defvar dumb-term-p (member (getenv "TERM") '("dumb" "cons25" "emacs"))) 29 | 30 | (defvar readline-function 31 | (if dumb-term-p 32 | 'emacs-read-line 33 | 'rl-read-line)) 34 | 35 | (defvar history-file 36 | (let ((data-home (getenv "XDG_DATA_HOME"))) 37 | (if (and data-home (= (aref data-home 0) ?/)) 38 | (concat data-home "/emacsrepl/history") 39 | (expand-file-name "~/.local/share/emacsrepl/history")))) 40 | 41 | (defvar blank-or-comment-re 42 | (rx bos (* space) (? (: ";" (* any))) eos)) 43 | 44 | (defun repl () 45 | (let (eof) 46 | (when (and (not dumb-term-p) (file-exists-p history-file)) 47 | (rl-history-load history-file)) 48 | (while (not eof) 49 | (condition-case err 50 | (let ((line (funcall readline-function "EMACS> "))) 51 | (if line 52 | (if (string-match-p blank-or-comment-re line) 53 | ;; treat empty line like C-c 54 | (signal 'rl-cancel nil) 55 | (when (not dumb-term-p) 56 | (rl-history-add line)) 57 | (princ (format "%s\n" (rep line)))) 58 | (princ "\n") 59 | (setq eof t))) 60 | (rl-cancel) ; proceed with new prompt 61 | (error 62 | (princ (format "%s\n" (error-message-string err)))))) 63 | (when (not dumb-term-p) 64 | (rl-history-dump history-file)))) 65 | 66 | (repl) 67 | -------------------------------------------------------------------------------- /readline.el: -------------------------------------------------------------------------------- 1 | ;; Copyright (C) 2016 Alain Kalker 2 | ;; Copyright (C) 2016 Vasilij Schneidermann 3 | 4 | ;; This file is free software; you can redistribute it and/or modify 5 | ;; it under the terms of the GNU General Public License as published by 6 | ;; the Free Software Foundation; either version 3, or (at your option) 7 | ;; any later version. 8 | 9 | ;; This file is distributed in the hope that it will be useful, 10 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | ;; GNU General Public License for more details. 13 | 14 | ;; You should have received a copy of the GNU General Public License 15 | ;; along with GNU Emacs; see the file COPYING. If not, write to 16 | ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 17 | ;; Boston, MA 02111-1307, USA. 18 | 19 | (require 'utf8-decode) 20 | (require 'ring) 21 | 22 | (defgroup readline nil 23 | "Readline-style editing library" 24 | :group 'terminals 25 | :prefix "rl-") 26 | 27 | (defcustom rl-decode-utf8 t 28 | "If non-nil, try decoding UTF-8 codepoints. 29 | Disable this if you're having issues or are using a different 30 | multi-byte encoding." 31 | :type 'boolean 32 | :group 'readline) 33 | 34 | ;;; input 35 | 36 | (defun rl-read-byte () 37 | (string-to-number (read-from-minibuffer "") 16)) 38 | 39 | (defun rl-read-utf8-char () 40 | (let ((state 0) 41 | (code-point 0) 42 | complete decoded) 43 | (while (not complete) 44 | (setq decoded (utf8-decode state code-point (rl-read-byte)) 45 | state (car decoded) 46 | code-point (cdr decoded)) 47 | (cond 48 | ((= state 0) 49 | (setq complete t)) 50 | ((= state 1) ; fail gracefully for single-byte compatibility 51 | (setq state 0)) 52 | (t 53 | ;; continue decoding non-trivial sequences 54 | ))) 55 | code-point)) 56 | 57 | (defun rl-read-sequence () 58 | (let ((state 'start) 59 | char output) 60 | (while (not (eq state 'end)) 61 | (setq char (funcall (if rl-decode-utf8 'rl-read-utf8-char 'read-byte))) 62 | (push char output) 63 | (cond 64 | ((eq state 'start) 65 | (if (= char ?\e) 66 | (setq state 'escape) 67 | (setq state 'end))) 68 | ((eq state 'escape) 69 | (if (= char ?\[) 70 | (setq state 'csi) 71 | (setq state 'end))) 72 | ((eq state 'csi) 73 | (if (and (>= char ?0) (<= char ?9)) 74 | (setq state 'csi) 75 | (setq state 'end))))) 76 | (concat (nreverse output)))) 77 | 78 | ;;; history handling 79 | 80 | (defvar rl-history-size 100) 81 | (defvar rl-history-index 0) 82 | (defvar rl-history (make-ring rl-history-size)) 83 | 84 | ;; not sure why that's not a thing... 85 | (defun rl-ring-set (ring index item) 86 | "Set RING's INDEX element to ITEM. 87 | INDEX = 0 is the most recently inserted; higher indices 88 | correspond to older elements. 89 | INDEX need not be <= the ring length; the appropriate modulo operation 90 | will be performed." 91 | (if (ring-empty-p ring) 92 | (error "Accessing an empty ring") 93 | (let ((hd (car ring)) 94 | (ln (cadr ring)) 95 | (vec (cddr ring))) 96 | (aset vec (ring-index index hd ln (length vec)) item)))) 97 | 98 | (defun rl-history-add (line) 99 | (ring-insert rl-history line)) 100 | 101 | (defun rl-history-dump (file) 102 | (let ((base-dir (file-name-directory file))) 103 | (when (not (file-exists-p base-dir)) 104 | (make-directory base-dir))) 105 | 106 | (let ((buffer-file-coding-system 'raw-text)) 107 | (with-temp-file file 108 | (dolist (item (nreverse (ring-elements rl-history))) 109 | (insert (format "%s\n" item)))))) 110 | 111 | (defun rl-history-load (file) 112 | (with-temp-buffer 113 | (insert-file-contents file) 114 | (goto-char (point-min)) 115 | (while (not (eobp)) 116 | (let ((line (buffer-substring (line-beginning-position) 117 | (line-end-position)))) 118 | (ring-insert rl-history line) 119 | (forward-line 1))))) 120 | 121 | ;;; escape codes 122 | 123 | ;; see https://github.com/antirez/linenoise and console_codes(4) 124 | 125 | (defconst rl-delete-to-end-sequence "\e[0K") 126 | (defconst rl-retreat-cursor-sequence "\e[%sD") 127 | (defconst rl-advance-cursor-sequence "\e[%sC") 128 | (defconst rl-clear-screen-sequence "\e[H\e[2J") 129 | 130 | ;;; main logic 131 | 132 | (when (not (fboundp 'define-error)) 133 | (defun define-error (name message &optional parent) 134 | "Define NAME as a new error signal. 135 | MESSAGE is a string that will be output to the echo area if such an error 136 | is signaled without being caught by a `condition-case'. 137 | PARENT is either a signal or a list of signals from which it inherits. 138 | Defaults to `error'." 139 | (unless parent (setq parent 'error)) 140 | (let ((conditions 141 | (if (consp parent) 142 | (apply #'nconc 143 | (mapcar (lambda (parent) 144 | (cons parent 145 | (or (get parent 'error-conditions) 146 | (error "Unknown signal `%s'" parent)))) 147 | parent)) 148 | (cons parent (get parent 'error-conditions))))) 149 | (put name 'error-conditions 150 | (delete-dups (copy-sequence (cons name conditions)))) 151 | (when message (put name 'error-message message))))) 152 | 153 | (define-error 'rl-cancel "Input cancelled") 154 | 155 | (defun rl-redraw-screen (prompt) 156 | (princ rl-clear-screen-sequence) 157 | (princ prompt) 158 | (princ (buffer-string))) 159 | 160 | (defun rl-navigate-history (prompt &optional prev) 161 | (let ((rl-history-length (ring-length rl-history))) 162 | (when (and (> rl-history-length 1) 163 | (if prev 164 | (< rl-history-index (1- rl-history-length)) 165 | (> rl-history-index 0))) 166 | (rl-ring-set rl-history rl-history-index (buffer-string)) 167 | (setq rl-history-index (+ rl-history-index (if prev 1 -1))) 168 | (let ((other-item (ring-ref rl-history rl-history-index))) 169 | (when (not (bobp)) 170 | (princ (format rl-retreat-cursor-sequence (1- (point))))) 171 | (princ rl-delete-to-end-sequence) 172 | (princ other-item) 173 | (erase-buffer) 174 | (insert other-item))))) 175 | 176 | (defun rl-prev-char () 177 | (when (not (bobp)) 178 | (princ (format rl-retreat-cursor-sequence 1)) 179 | (forward-char -1))) 180 | 181 | (defun rl-next-char () 182 | (when (not (eobp)) 183 | (princ (format rl-advance-cursor-sequence 1)) 184 | (forward-char 1))) 185 | 186 | (defun rl-line-beginning (prompt) 187 | (when (not (bobp)) 188 | (princ (format rl-retreat-cursor-sequence (1- (point)))) 189 | (goto-char (point-min)))) 190 | 191 | (defun rl-line-end () 192 | (when (not (eobp)) 193 | (princ (format rl-advance-cursor-sequence (- (point-max) (point)))) 194 | (goto-char (point-max)))) 195 | 196 | (defun rl-delete-prev-char () 197 | (when (not (bobp)) 198 | (princ (format rl-retreat-cursor-sequence 1)) 199 | (princ rl-delete-to-end-sequence) 200 | (when (not (eobp)) 201 | (princ (buffer-substring (point) (point-max))) 202 | (princ (format rl-retreat-cursor-sequence (- (point-max) (point))))) 203 | (delete-char -1))) 204 | 205 | (defun rl-delete-next-char () 206 | (when (not (eobp)) 207 | (princ rl-delete-to-end-sequence) 208 | (when (> (- (point-max) (point)) 1) 209 | (princ (buffer-substring (1+ (point)) (point-max))) 210 | (princ (format rl-retreat-cursor-sequence (- (point-max) (1+ (point)))))) 211 | (delete-char 1))) 212 | 213 | (defun rl-delete-line (prompt) 214 | (when (not (zerop (buffer-size))) 215 | (when (not (bobp)) 216 | (princ (format rl-retreat-cursor-sequence (1- (point))))) 217 | (princ rl-delete-to-end-sequence) 218 | (erase-buffer))) 219 | 220 | (defun rl-delete-to-end () 221 | (when (not (eobp)) 222 | (delete-region (point) (point-max)) 223 | (princ rl-delete-to-end-sequence))) 224 | 225 | (defun rl-delete-prev-word () 226 | (when (not (bobp)) 227 | (let ((word-beg (save-excursion 228 | (forward-word -1) 229 | (point)))) 230 | (princ (format rl-retreat-cursor-sequence (- (point) word-beg))) 231 | (princ rl-delete-to-end-sequence) 232 | (when (not (eobp)) 233 | (princ (buffer-substring (point) (point-max))) 234 | (princ (format rl-retreat-cursor-sequence (- (point-max) (point))))) 235 | (delete-region word-beg (point))))) 236 | 237 | (defun rl-transpose-chars () 238 | (when (>= (buffer-size) 2) 239 | (cond 240 | ((bobp) 241 | (princ (format rl-advance-cursor-sequence 1)) 242 | (forward-char 1)) 243 | ((eobp) 244 | (princ (format rl-retreat-cursor-sequence 1)) 245 | (forward-char -1))) 246 | (let ((prev (preceding-char)) 247 | (next (following-char))) 248 | (princ (format rl-retreat-cursor-sequence 1)) 249 | (princ (format "%c%c" next prev)) 250 | (delete-char -1) 251 | (delete-char 1) 252 | (insert next prev)))) 253 | 254 | (defun rl-send-line () 255 | (princ "\n") 256 | (setq rl-history-index 0) 257 | (ring-remove rl-history 0)) 258 | 259 | (defun rl-cancel-input () 260 | (princ "\n") 261 | (signal 'rl-cancel nil)) 262 | 263 | (defun rl-printed-representation (chars) 264 | (mapconcat 265 | (lambda (char) 266 | (if (< char ?\s) 267 | (format "^%c" (logior char 64)) 268 | (format "%c" char))) 269 | chars "")) 270 | 271 | (defun rl-print-chars (chars) 272 | (let ((representation (rl-printed-representation chars))) 273 | (princ representation) 274 | (when (> (- (point-max) (point)) 1) 275 | (princ rl-delete-to-end-sequence) 276 | (princ (buffer-substring (point) (point-max))) 277 | (princ (format rl-retreat-cursor-sequence (- (point-max) (point))))) 278 | (insert representation))) 279 | 280 | (defun rl-read-line (prompt) 281 | (with-temp-buffer 282 | (princ prompt) 283 | (let (eol return) 284 | (ring-insert rl-history "") ; scratch entry 285 | (while (not (or eol return)) 286 | (let* ((chars (rl-read-sequence))) 287 | (cond 288 | ;; special 289 | ((equal chars "\C-l") 290 | (rl-redraw-screen prompt)) 291 | ;; history 292 | ((or (equal chars "\C-p") 293 | (equal chars "\e[A")) ; 294 | (rl-navigate-history prompt t)) 295 | ((or (equal chars "\C-n") 296 | (equal chars "\e[B")) ; 297 | (rl-navigate-history prompt)) 298 | ;; movement 299 | ((or (equal chars "\C-b") 300 | (equal chars "\e[D")) ; 301 | (rl-prev-char)) 302 | ((or (equal chars "\C-f") 303 | (equal chars "\e[C")) ; 304 | (rl-next-char)) 305 | ((or (equal chars "\C-a") 306 | (equal chars "\e[H") ; (xterm) 307 | (equal chars "\e[1~")) 308 | (rl-line-beginning prompt)) 309 | ((or (equal chars "\C-e") 310 | (equal chars "\e[F") ; (xterm) 311 | (equal chars "\e[4~")) 312 | (rl-line-end)) 313 | ((or (equal chars "\C-h") 314 | (equal chars "\C-?")) 315 | (rl-delete-prev-char)) 316 | ((equal chars "\C-d") 317 | (if (zerop (buffer-size)) ; empty prompt 318 | (progn 319 | (setq eol t) 320 | (ring-remove rl-history 0)) 321 | (rl-delete-next-char))) 322 | ((equal chars "\e[3~") ; DEL 323 | (rl-delete-next-char)) 324 | ((equal chars "\C-u") 325 | (rl-delete-line prompt)) 326 | ((equal chars "\C-k") 327 | (rl-delete-to-end)) 328 | ((equal chars "\C-w") 329 | (rl-delete-prev-word)) 330 | ;; editing 331 | ((equal chars "\C-t") 332 | (rl-transpose-chars)) 333 | ;; control flow 334 | ((or (equal chars "\C-j") 335 | (equal chars "\C-m")) 336 | (rl-send-line) 337 | (setq return t)) 338 | ((equal chars "\C-c") 339 | (rl-cancel-input)) 340 | ;; printables 341 | (t 342 | (rl-print-chars chars))))) 343 | (when return 344 | (buffer-string))))) 345 | 346 | (provide 'readline) 347 | -------------------------------------------------------------------------------- /utf8-decode.el: -------------------------------------------------------------------------------- 1 | ;; Copyright (c) 2016 Alain Kalker 2 | ;; Based on work Copyright (c) 2008-2009 Bjoern Hoehrmann 3 | 4 | ;; Permission is hereby granted, free of charge, to any person 5 | ;; obtaining a copy of this software and associated documentation 6 | ;; files (the "Software"), to deal in the Software without 7 | ;; restriction, including without limitation the rights to use, copy, 8 | ;; modify, merge, publish, distribute, sublicense, and/or sell copies 9 | ;; of the Software, and to permit persons to whom the Software is 10 | ;; furnished to do so, subject to the following conditions: 11 | 12 | ;; The above copyright notice and this permission notice shall be 13 | ;; included in all copies or substantial portions of the Software. 14 | 15 | ;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 | ;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 | ;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18 | ;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 19 | ;; BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20 | ;; ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 21 | ;; CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 | ;; SOFTWARE. 23 | 24 | ;; http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ 25 | 26 | (defconst utf8-accept 0) 27 | (defconst utf8-reject 1) 28 | 29 | (defconst utf8-decode [ 30 | 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ; 00..1f 31 | 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ; 20..3f 32 | 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ; 40..5f 33 | 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ; 60..7f 34 | 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 ; 80..9f 35 | 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 ; a0..bf 36 | 8 8 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 ; c0..df 37 | #xa #x3 #x3 #x3 #x3 #x3 #x3 #x3 #x3 #x3 #x3 #x3 #x3 #x4 #x3 #x3 ; e0..ef 38 | #xb #x6 #x6 #x6 #x5 #x8 #x8 #x8 #x8 #x8 #x8 #x8 #x8 #x8 #x8 #x8 ; f0..ff 39 | #x0 #x1 #x2 #x3 #x5 #x8 #x7 #x1 #x1 #x1 #x4 #x6 #x1 #x1 #x1 #x1 ; s0..s0 40 | 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 1 ; s1..s2 41 | 1 2 1 1 1 1 1 2 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 ; s3..s4 42 | 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 3 1 3 1 1 1 1 1 1 ; s5..s6 43 | 1 3 1 1 1 1 1 3 1 3 1 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ; s7..s8 44 | ]) 45 | 46 | (defun utf8-decode (state code-point byte) 47 | (let* ((type (elt utf8-decode byte)) 48 | (code-point (if (not (= state utf8-accept)) 49 | (logior (logand byte #x3f) (lsh code-point 6)) 50 | (logand (lsh #xff (- type)) byte))) 51 | (state (elt utf8-decode (+ 256 (* state 16) type)))) 52 | (cons state code-point))) 53 | 54 | (provide 'utf8-decode) 55 | --------------------------------------------------------------------------------