├── LICENSE ├── README.md └── janet-mode.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 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 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 | {project} Copyright (C) {year} {fullname} 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.md: -------------------------------------------------------------------------------- 1 | janet-mode - A major mode for Janet 2 | ===================================== 3 | 4 | [![License GPL 3][badge-license]][license] 5 | 6 | `janet-mode` provides a major mode for the [Janet][] programming language. 7 | 8 | Installation 9 | ------------ 10 | 11 | Ensure that `janet-mode.el` is in your load-path, and then add 12 | 13 | (require 'janet-mode) 14 | 15 | to your emacs init file. 16 | 17 | [Janet]: https://janet-lang.org/ 18 | [badge-license]: https://img.shields.io/badge/license-GPL_3-green.svg?dummy 19 | [license]: https://github.com/ALSchwalm/janet-mode/blob/master/LICENSE 20 | -------------------------------------------------------------------------------- /janet-mode.el: -------------------------------------------------------------------------------- 1 | ;;; janet-mode.el --- Defines a major mode for Janet -*- lexical-binding: t; -*- 2 | 3 | ;; Copyright (c) 2019 Adam Schwalm 4 | 5 | ;; Author: Adam Schwalm 6 | ;; Version: 0.1.0 7 | ;; URL: https://github.com/ALSchwalm/janet-mode 8 | ;; Package-Requires: ((emacs "24.3")) 9 | 10 | ;; This program is free software: you can redistribute it and/or modify 11 | ;; it under the terms of the GNU General Public License as published by 12 | ;; the Free Software Foundation, either version 3 of the License, or 13 | ;; (at your option) any later version. 14 | 15 | ;; This program is distributed in the hope that it will be useful, 16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of 17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 | ;; GNU General Public License for more details. 19 | 20 | ;; You should have received a copy of the GNU General Public License 21 | ;; along with this program. If not, see . 22 | 23 | ;;; Commentary: 24 | 25 | ;; Defines a major mode for the janet language: https://janet-lang.org/ 26 | 27 | ;;; Code: 28 | 29 | (require 'cl-lib) 30 | 31 | (defgroup janet nil 32 | "A mode for Janet" 33 | :group 'languages) 34 | 35 | (defvar janet-mode-syntax-table 36 | (let ((table (make-syntax-table))) 37 | 38 | ;; Comments start with a '#' and end with a newline 39 | (modify-syntax-entry ?# "<" table) 40 | (modify-syntax-entry ?\n ">" table) 41 | 42 | ;; For keywords, make the ':' part of the symbol class 43 | (modify-syntax-entry ?: "_" table) 44 | 45 | ;; Backtick is a string delimiter 46 | (modify-syntax-entry ?` "\"" table) 47 | 48 | ;; Other chars that are allowed in symbols 49 | (modify-syntax-entry ?? "_" table) 50 | (modify-syntax-entry ?! "_" table) 51 | (modify-syntax-entry ?. "_" table) 52 | (modify-syntax-entry ?@ "_" table) 53 | 54 | table)) 55 | 56 | (defconst janet-symbol '(one-or-more (or (syntax word) (syntax symbol))) 57 | "Regex representation of a Janet symbol. 58 | A Janet symbol is a collection of words or symbol characters as determined by 59 | the syntax table. This allows us to keep things like '-' in the symbol part of 60 | the syntax table, so `forward-word' works as expected.") 61 | 62 | (defconst janet-start-of-sexp '("(" (zero-or-more (or space "\n")))) 63 | 64 | (defconst janet-macro-decl-forms '("defmacro" "defmacro-")) 65 | 66 | (defconst janet-normal-function-decl-forms '("defn" "defn-")) 67 | 68 | (defconst janet-function-decl-forms 69 | `(,@janet-normal-function-decl-forms ,@janet-macro-decl-forms "varfn" "fn")) 70 | 71 | (defconst janet-function-pattern 72 | (rx-to-string `(sequence ,@janet-start-of-sexp 73 | (or ,@janet-function-decl-forms) 74 | (one-or-more space) (group ,janet-symbol) symbol-end)) 75 | "The regex to identify janet function names.") 76 | 77 | (defconst janet-var-decl-forms 78 | '("var" "var-" "def" "def-" "defglobal" "varglobal" "default" "dyn")) 79 | 80 | (defconst janet-variable-declaration-pattern 81 | (rx-to-string `(sequence ,@janet-start-of-sexp 82 | (or ,@janet-var-decl-forms) 83 | (one-or-more space) (group ,janet-symbol))) 84 | "The regex to identify variable declarations.") 85 | 86 | (defconst janet-keyword-pattern 87 | (rx-to-string `(group symbol-start ":" ,janet-symbol))) 88 | 89 | (defconst janet-error-pattern 90 | (rx-to-string `(sequence ,@janet-start-of-sexp (group symbol-start "error" symbol-end)))) 91 | 92 | (defconst janet-constant-pattern 93 | (rx-to-string `(group symbol-start (group (or "true" "false" "nil")) symbol-end))) 94 | 95 | (defconst janet-imenu-generic-expression 96 | `((nil 97 | ,(rx-to-string `(sequence line-start ,@janet-start-of-sexp 98 | (or ,@janet-normal-function-decl-forms) 99 | (one-or-more space) 100 | (group ,janet-symbol))) 101 | 1) 102 | ("Variables" 103 | ,(rx-to-string `(sequence line-start ,@janet-start-of-sexp 104 | (or ,@janet-var-decl-forms) 105 | (one-or-more space) 106 | (group ,janet-symbol))) 107 | 1) 108 | ("Macros" 109 | ,(rx-to-string `(sequence line-start ,@janet-start-of-sexp 110 | (or ,@janet-macro-decl-forms) 111 | (one-or-more space) 112 | (group ,janet-symbol))) 113 | 1))) 114 | 115 | (defcustom janet-special-forms 116 | `( 117 | ;; Not all explicitly special forms, but included for 118 | ;; symmetry with other lisp-modes 119 | 120 | "->" 121 | "->>" 122 | "-?>" 123 | "-?>>" 124 | "as->" 125 | "as?->" 126 | "break" 127 | "cond" 128 | "coro" 129 | "do" 130 | "each" 131 | "fn" 132 | "for" 133 | "generate" 134 | "if" 135 | "if-let" 136 | "if-not" 137 | "import" 138 | "let" 139 | "loop" 140 | "match" 141 | "quasiquote" 142 | "quote" 143 | "require" 144 | "seq" 145 | "set" 146 | "setdyn" 147 | "splice" 148 | "try" 149 | "unless" 150 | "unquote" 151 | "var" 152 | "when" 153 | "when-let" 154 | "while" 155 | "with" 156 | "with-dyns" 157 | "with-syms" 158 | "with-vars" 159 | 160 | ,@janet-var-decl-forms 161 | ,@janet-function-decl-forms) 162 | "List of Janet special forms." 163 | :type '(repeat string) 164 | :group 'janet) 165 | 166 | (defconst janet-special-form-pattern 167 | (let ((builtins (cons 'or janet-special-forms))) 168 | (rx-to-string `(sequence ,@janet-start-of-sexp (group ,builtins) symbol-end))) 169 | "The regex to identify builtin Janet special forms.") 170 | 171 | (defconst janet-highlights 172 | `((,janet-special-form-pattern . (1 font-lock-keyword-face)) 173 | (,janet-function-pattern . (1 font-lock-function-name-face)) 174 | (,janet-variable-declaration-pattern . (1 font-lock-variable-name-face)) 175 | (,janet-error-pattern . (1 font-lock-warning-face)) 176 | (,janet-constant-pattern . (1 font-lock-constant-face)) 177 | (,janet-keyword-pattern . (1 font-lock-builtin-face)))) 178 | 179 | ;; The janet-mode indentation logic borrows heavily from 180 | ;; racket-mode and clojure-mode 181 | 182 | (defcustom janet-indent 2 183 | "The number of spaces to add per indentation level." 184 | :type 'integer 185 | :group 'janet) 186 | 187 | (defcustom janet-indent-sequence-depth 1 188 | "To what depth should `janet-indent-line' search. 189 | This affects the indentation of forms like '() `() and {}, 190 | but not () or ,@(). A zero value disables, giving the normal 191 | indent behavior of Emacs `lisp-mode' derived modes. Setting this 192 | to a high value can make indentation noticeably slower." 193 | :type 'integer 194 | :group 'janet) 195 | 196 | (defun janet--ppss-containing-sexp (xs) 197 | "The start of the innermost paren grouping containing the stopping point. 198 | XS must be a `parse-partial-sexp' -- NOT `syntax-ppss'." 199 | (elt xs 1)) 200 | 201 | (defun janet--ppss-last-sexp (xs) 202 | "The character position of the start of the last complete subexpression. 203 | XS must be a `parse-partial-sexp' -- NOT `syntax-ppss'." 204 | (elt xs 2)) 205 | 206 | (defun janet--ppss-string-p (xs) 207 | "Non-nil if inside a string. 208 | More precisely, this is the character that will terminate the 209 | string, or t if a generic string delimiter character should 210 | terminate it. 211 | XS must be a `parse-partial-sexp' -- NOT `syntax-ppss'." 212 | (elt xs 3)) 213 | 214 | (defun janet-indent-line () 215 | "Indent current line as Janet code." 216 | (interactive) 217 | (pcase (janet--calculate-indent) 218 | (`() nil) 219 | ;; When point is within the leading whitespace, move it past the 220 | ;; new indentation whitespace. Otherwise preserve its position 221 | ;; relative to the original text. 222 | (amount (let ((pos (- (point-max) (point))) 223 | (beg (progn (beginning-of-line) (point)))) 224 | (skip-chars-forward " \t") 225 | (unless (= amount (current-column)) 226 | (delete-region beg (point)) 227 | (indent-to amount)) 228 | (when (< (point) (- (point-max) pos)) 229 | (goto-char (- (point-max) pos))))))) 230 | 231 | (defun janet--calculate-indent () 232 | "Calculate the appropriate indentation for the current Janet line." 233 | (save-excursion 234 | (beginning-of-line) 235 | (let ((indent-point (point)) 236 | (state nil)) 237 | (janet--plain-beginning-of-defun) 238 | (while (< (point) indent-point) 239 | (setq state (parse-partial-sexp (point) indent-point 0))) 240 | (let ((strp (janet--ppss-string-p state)) 241 | (last (janet--ppss-last-sexp state)) 242 | (cont (janet--ppss-containing-sexp state))) 243 | (cond 244 | (strp nil) 245 | ((and (janet--looking-at-keyword-p last) 246 | (not (janet--line-closes-delimiter-p indent-point))) 247 | (goto-char (1+ cont)) (+ (current-column) janet-indent)) 248 | ((and state last cont) (janet-indent-function indent-point state)) 249 | (cont (goto-char (1+ cont)) (current-column)) 250 | (t (current-column))))))) 251 | 252 | (defun janet--looking-at-keyword-p (point) 253 | "Is the given POINT the start of a keyword?" 254 | (when point 255 | (save-excursion 256 | (goto-char point) 257 | (looking-at (rx-to-string `(group ":" ,janet-symbol)))))) 258 | 259 | (defun janet--plain-beginning-of-defun () 260 | "Quickly move to the start of the function containing the point." 261 | (when (re-search-backward (rx bol (syntax open-parenthesis)) 262 | nil 263 | 'move) 264 | (goto-char (1- (match-end 0))))) 265 | 266 | (defun janet--get-indent-function-method (symbol) 267 | "Retrieve the indent function for a given SYMBOL." 268 | (let ((sym (intern-soft symbol))) 269 | (get sym 'janet-indent-function))) 270 | 271 | (defun janet-indent-function (indent-point state) 272 | "Called by `janet--calculate-indent' to get indent column. 273 | 274 | INDENT-POINT is the position at which the line being indented begins. 275 | STATE is the `parse-partial-sexp' state for that position. 276 | There is special handling for: 277 | - Common Janet special forms 278 | - [], @[], {}, and @{} forms" 279 | (goto-char (janet--ppss-containing-sexp state)) 280 | (let ((body-indent (+ (current-column) janet-indent))) 281 | (forward-char 1) 282 | (if (janet--data-sequence-p) 283 | (progn 284 | (backward-prefix-chars) 285 | ;; Don't indent the end of a data list 286 | (when (janet--line-closes-delimiter-p indent-point) 287 | (backward-char 1)) 288 | (current-column)) 289 | (let* ((head (buffer-substring (point) (progn (forward-sexp 1) (point)))) 290 | (method (janet--get-indent-function-method head))) 291 | (cond ((integerp method) 292 | (janet--indent-special-form method indent-point state)) 293 | ((eq method 'defun) 294 | body-indent) 295 | (method 296 | (funcall method indent-point state)) 297 | ((string-match (rx bos (or "def" "with-")) head) 298 | body-indent) ;just like 'defun 299 | (t 300 | (janet--normal-indent state))))))) 301 | 302 | (defun janet--line-closes-delimiter-p (point) 303 | "Is the line at POINT ending an expression?" 304 | (save-excursion 305 | (goto-char point) 306 | (looking-at (rx (zero-or-more space) (syntax close-parenthesis))))) 307 | 308 | (defun janet--data-sequence-p () 309 | "Is the point in a data squence? 310 | 311 | Data sequences consist of '(), {}, @{}, [], and @[]." 312 | (and (< 0 janet-indent-sequence-depth) 313 | (save-excursion 314 | (ignore-errors 315 | (let ((answer 'unknown) 316 | (depth janet-indent-sequence-depth)) 317 | (while (and (eq answer 'unknown) 318 | (< 0 depth)) 319 | (backward-up-list) 320 | (cl-decf depth) 321 | (cond ((or 322 | ;; a quoted '( ) or quasiquoted `( ) list 323 | (and (memq (char-before (point)) '(?\' ?\`)) 324 | (eq (char-after (point)) ?\()) 325 | ;; [ ] 326 | (eq (char-after (point)) ?\[) 327 | ;; { } 328 | (eq (char-after (point)) ?{)) 329 | (setq answer t)) 330 | (;; unquote or unquote-splicing 331 | (and (or (eq (char-before (point)) ?,) 332 | (and (eq (char-before (1- (point))) ?,) 333 | (eq (char-before (point)) ?@))) 334 | (eq (char-after (point)) ?\()) 335 | (setq answer nil)))) 336 | (eq answer t)))))) 337 | 338 | (defun janet--normal-indent (state) 339 | "Calculate the correct indentation for a 'normal' Janet form. 340 | 341 | STATE is the `parse-partial-sexp' state for that position." 342 | (goto-char (janet--ppss-last-sexp state)) 343 | (backward-prefix-chars) 344 | (let ((last-sexp nil)) 345 | (if (ignore-errors 346 | ;; `backward-sexp' until we reach the start of a sexp that is the 347 | ;; first of its line (the start of the enclosing sexp). 348 | (while (string-match (rx (not blank)) 349 | (buffer-substring (line-beginning-position) 350 | (point))) 351 | (setq last-sexp (prog1 (point) 352 | (forward-sexp -1)))) 353 | t) 354 | ;; Here we've found an arg before the arg we're indenting 355 | ;; which is at the start of a line. 356 | (current-column) 357 | ;; Here we've reached the start of the enclosing sexp (point is 358 | ;; now at the function name), so the behavior depends on whether 359 | ;; there's also an argument on this line. 360 | (when (and last-sexp 361 | (< last-sexp (line-end-position))) 362 | ;; There's an arg after the function name, so align with it. 363 | (goto-char last-sexp)) 364 | (current-column)))) 365 | 366 | (defun janet--indent-special-form (method indent-point state) 367 | "Calculate the correct indentation for a 'special' Janet form. 368 | 369 | METHOD is the number of \"special\" args that get extra indent when 370 | not on the first line. Any additinonl args get normal indent 371 | INDENT-POINT is the position at which the line being indented begins. 372 | STATE is the `parse-partial-sexp' state for that position." 373 | (let ((containing-column (save-excursion 374 | (goto-char (janet--ppss-containing-sexp state)) 375 | (current-column))) 376 | (pos -1)) 377 | (condition-case nil 378 | (while (and (<= (point) indent-point) 379 | (not (eobp))) 380 | (forward-sexp 1) 381 | (cl-incf pos)) 382 | ;; If indent-point is _after_ the last sexp in the current sexp, 383 | ;; we detect that by catching the `scan-error'. In that case, we 384 | ;; should return the indentation as if there were an extra sexp 385 | ;; at point. 386 | (scan-error (cl-incf pos))) 387 | (cond ((= method pos) ;first non-distinguished arg 388 | (+ containing-column janet-indent)) 389 | ((< method pos) ;more non-distinguished args 390 | (janet--normal-indent state)) 391 | (t ;distinguished args 392 | (+ containing-column (* 2 janet-indent)))))) 393 | 394 | (defun janet--set-indentation () 395 | "Set indentation for various Janet forms." 396 | (mapc (lambda (x) 397 | (put (car x) 'janet-indent-function (cadr x))) 398 | '((and 0) 399 | (defmacro defun) 400 | (defmacro- defun) 401 | (defn defun) 402 | (defn- defun) 403 | (case 1) 404 | (cond 0) 405 | (do 0) 406 | (each 2) 407 | (fn defun) 408 | (for 3) 409 | (if 1) 410 | (if-let 1) 411 | (if-not 1) 412 | (let 1) 413 | (loop 1) 414 | (match 1) 415 | (or 0) 416 | (reduce 0) 417 | (try 0) 418 | (unless 1) 419 | (varfn defun) 420 | (when 1) 421 | (when-let 1) 422 | (while 1)))) 423 | 424 | ;;;###autoload 425 | (define-derived-mode janet-mode prog-mode "janet" 426 | "Major mode for the Janet language" 427 | :syntax-table janet-mode-syntax-table 428 | (setq-local font-lock-defaults '(janet-highlights)) 429 | (setq-local indent-line-function #'janet-indent-line) 430 | (setq-local lisp-indent-function #'janet-indent-function) 431 | (setq-local comment-start "#") 432 | (setq-local comment-start-skip "#+ *") 433 | (setq-local comment-use-syntax t) 434 | (setq-local comment-end "") 435 | (setq-local imenu-case-fold-search t) 436 | (setq-local imenu-generic-expression janet-imenu-generic-expression) 437 | (janet--set-indentation)) 438 | 439 | ;;;###autoload 440 | (add-to-list 'auto-mode-alist '("\\.janet\\'" . janet-mode)) 441 | 442 | ;;;###autoload 443 | (add-to-list 'interpreter-mode-alist '("janet" . janet-mode)) 444 | 445 | (provide 'janet-mode) 446 | ;;; janet-mode.el ends here 447 | --------------------------------------------------------------------------------