| 1 | ;;; cl-indent.el --- enhanced lisp-indent mode |
| 2 | |
| 3 | ;; Copyright (C) 1987 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: Richard Mlynark <mly@eddie.mit.edu> |
| 6 | ;; Created: July 1987 |
| 7 | ;; Maintainer: FSF |
| 8 | ;; Keywords: lisp, tools |
| 9 | |
| 10 | ;; This file is part of GNU Emacs. |
| 11 | |
| 12 | ;; GNU Emacs is free software; you can redistribute it and/or modify |
| 13 | ;; it under the terms of the GNU General Public License as published by |
| 14 | ;; the Free Software Foundation; either version 2, or (at your option) |
| 15 | ;; any later version. |
| 16 | |
| 17 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | ;; GNU General Public License for more details. |
| 21 | |
| 22 | ;; You should have received a copy of the GNU General Public License |
| 23 | ;; along with GNU Emacs; see the file COPYING. If not, write to |
| 24 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 25 | |
| 26 | ;;; Commentary: |
| 27 | |
| 28 | ;; This package supplies a single entry point, common-lisp-indent-function, |
| 29 | ;; which performs indentation in the preferred style for Common Lisp code. |
| 30 | ;; To enable it: |
| 31 | ;; |
| 32 | ;; (setq lisp-indent-function 'common-lisp-indent-function) |
| 33 | |
| 34 | ;;>> TODO |
| 35 | ;; :foo |
| 36 | ;; bar |
| 37 | ;; :baz |
| 38 | ;; zap |
| 39 | ;; &key (like &body)?? |
| 40 | |
| 41 | ;; &rest 1 in lambda-lists doesn't work |
| 42 | ;; -- really want (foo bar |
| 43 | ;; baz) |
| 44 | ;; not (foo bar |
| 45 | ;; baz) |
| 46 | ;; Need something better than &rest for such cases |
| 47 | |
| 48 | ;;; Code: |
| 49 | |
| 50 | (defvar lisp-indent-maximum-backtracking 3 |
| 51 | "*Maximum depth to backtrack out from a sublist for structured indentation. |
| 52 | If this variable is 0, no backtracking will occur and forms such as flet |
| 53 | may not be correctly indented.") |
| 54 | |
| 55 | (defvar lisp-tag-indentation 1 |
| 56 | "*Indentation of tags relative to containing list. |
| 57 | This variable is used by the function `lisp-indent-tagbody'.") |
| 58 | |
| 59 | (defvar lisp-tag-body-indentation 3 |
| 60 | "*Indentation of non-tagged lines relative to containing list. |
| 61 | This variable is used by the function `lisp-indent-tagbody' to indent normal |
| 62 | lines (lines without tags). |
| 63 | The indentation is relative to the indentation of the parenthesis enclosing |
| 64 | the special form. If the value is t, the body of tags will be indented |
| 65 | as a block at the same indentation as the first s-expression following |
| 66 | the tag. In this case, any forms before the first tag are indented |
| 67 | by `lisp-body-indent'.") |
| 68 | |
| 69 | \f |
| 70 | ;;;###autoload |
| 71 | (defun common-lisp-indent-function (indent-point state) |
| 72 | (let ((normal-indent (current-column))) |
| 73 | ;; Walk up list levels until we see something |
| 74 | ;; which does special things with subforms. |
| 75 | (let ((depth 0) |
| 76 | ;; Path describes the position of point in terms of |
| 77 | ;; list-structure with respect to contining lists. |
| 78 | ;; `foo' has a path of (0 4 1) in `((a b c (d foo) f) g)' |
| 79 | (path ()) |
| 80 | ;; set non-nil when somebody works out the indentation to use |
| 81 | calculated |
| 82 | (last-point indent-point) |
| 83 | ;; the position of the open-paren of the innermost containing list |
| 84 | (containing-form-start (elt state 1)) |
| 85 | ;; the column of the above |
| 86 | sexp-column) |
| 87 | ;; Move to start of innermost containing list |
| 88 | (goto-char containing-form-start) |
| 89 | (setq sexp-column (current-column)) |
| 90 | ;; Look over successively less-deep containing forms |
| 91 | (while (and (not calculated) |
| 92 | (< depth lisp-indent-maximum-backtracking)) |
| 93 | (let ((containing-sexp (point))) |
| 94 | (forward-char 1) |
| 95 | (parse-partial-sexp (point) indent-point 1 t) |
| 96 | ;; Move to the car of the relevant containing form |
| 97 | (let (tem function method) |
| 98 | (if (not (looking-at "\\sw\\|\\s_")) |
| 99 | ;; This form doesn't seem to start with a symbol |
| 100 | (setq function nil method nil) |
| 101 | (setq tem (point)) |
| 102 | (forward-sexp 1) |
| 103 | (setq function (downcase (buffer-substring tem (point)))) |
| 104 | (goto-char tem) |
| 105 | (setq tem (intern-soft function) |
| 106 | method (get tem 'common-lisp-indent-function)) |
| 107 | (cond ((and (null method) |
| 108 | (string-match ":[^:]+" function)) |
| 109 | ;; The pleblisp package feature |
| 110 | (setq function (substring function |
| 111 | (1+ (match-beginning 0))) |
| 112 | method (get (intern-soft function) |
| 113 | 'common-lisp-indent-function))) |
| 114 | ((and (null method)) |
| 115 | ;; backwards compatibility |
| 116 | (setq method (get tem 'lisp-indent-function))))) |
| 117 | (let ((n 0)) |
| 118 | ;; How far into the containing form is the current form? |
| 119 | (if (< (point) indent-point) |
| 120 | (while (condition-case () |
| 121 | (progn |
| 122 | (forward-sexp 1) |
| 123 | (if (>= (point) indent-point) |
| 124 | nil |
| 125 | (parse-partial-sexp (point) |
| 126 | indent-point 1 t) |
| 127 | (setq n (1+ n)) |
| 128 | t)) |
| 129 | (error nil)))) |
| 130 | (setq path (cons n path))) |
| 131 | |
| 132 | ;; backwards compatibility. |
| 133 | (cond ((null function)) |
| 134 | ((null method) |
| 135 | (if (null (cdr path)) |
| 136 | ;; (package prefix was stripped off above) |
| 137 | (setq method (cond ((string-match "\\`def" |
| 138 | function) |
| 139 | '(4 (&whole 4 &rest 1) &body)) |
| 140 | ((string-match "\\`\\(with\\|do\\)-" |
| 141 | function) |
| 142 | '(4 &body)))))) |
| 143 | ;; backwards compatibility. Bletch. |
| 144 | ((eq method 'defun) |
| 145 | (setq method '(4 (&whole 4 &rest 1) &body)))) |
| 146 | |
| 147 | (cond ((and (memq (char-after (1- containing-sexp)) '(?\' ?\`)) |
| 148 | (not (eql (char-after (- containing-sexp 2)) ?\#))) |
| 149 | ;; No indentation for "'(...)" elements |
| 150 | (setq calculated (1+ sexp-column))) |
| 151 | ((or (eql (char-after (1- containing-sexp)) ?\,) |
| 152 | (and (eql (char-after (1- containing-sexp)) ?\@) |
| 153 | (eql (char-after (- containing-sexp 2)) ?\,))) |
| 154 | ;; ",(...)" or ",@(...)" |
| 155 | (setq calculated normal-indent)) |
| 156 | ((eql (char-after (1- containing-sexp)) ?\#) |
| 157 | ;; "#(...)" |
| 158 | (setq calculated (1+ sexp-column))) |
| 159 | ((null method)) |
| 160 | ((integerp method) |
| 161 | ;; convenient top-level hack. |
| 162 | ;; (also compatible with lisp-indent-function) |
| 163 | ;; The number specifies how many `distinguished' |
| 164 | ;; forms there are before the body starts |
| 165 | ;; Equivalent to (4 4 ... &body) |
| 166 | (setq calculated (cond ((cdr path) |
| 167 | normal-indent) |
| 168 | ((<= (car path) method) |
| 169 | ;; `distinguished' form |
| 170 | (list (+ sexp-column 4) |
| 171 | containing-form-start)) |
| 172 | ((= (car path) (1+ method)) |
| 173 | ;; first body form. |
| 174 | (+ sexp-column lisp-body-indent)) |
| 175 | (t |
| 176 | ;; other body form |
| 177 | normal-indent)))) |
| 178 | ((symbolp method) |
| 179 | (setq calculated (funcall method |
| 180 | path state indent-point |
| 181 | sexp-column normal-indent))) |
| 182 | (t |
| 183 | (setq calculated (lisp-indent-259 |
| 184 | method path state indent-point |
| 185 | sexp-column normal-indent))))) |
| 186 | (goto-char containing-sexp) |
| 187 | (setq last-point containing-sexp) |
| 188 | (if (not calculated) |
| 189 | (condition-case () |
| 190 | (progn (backward-up-list 1) |
| 191 | (setq depth (1+ depth))) |
| 192 | (error (setq depth lisp-indent-maximum-backtracking)))))) |
| 193 | calculated))) |
| 194 | |
| 195 | |
| 196 | (defun lisp-indent-report-bad-format (m) |
| 197 | (error "%s has a badly-formed %s property: %s" |
| 198 | ;; Love those free variable references!! |
| 199 | function 'common-lisp-indent-function m)) |
| 200 | |
| 201 | ;; Blame the crufty control structure on dynamic scoping |
| 202 | ;; -- not on me! |
| 203 | (defun lisp-indent-259 (method path state indent-point |
| 204 | sexp-column normal-indent) |
| 205 | (catch 'exit |
| 206 | (let ((p path) |
| 207 | (containing-form-start (elt state 1)) |
| 208 | n tem tail) |
| 209 | ;; Isn't tail-recursion wonderful? |
| 210 | (while p |
| 211 | ;; This while loop is for destructuring. |
| 212 | ;; p is set to (cdr p) each iteration. |
| 213 | (if (not (consp method)) (lisp-indent-report-bad-format method)) |
| 214 | (setq n (1- (car p)) |
| 215 | p (cdr p) |
| 216 | tail nil) |
| 217 | (while n |
| 218 | ;; This while loop is for advancing along a method |
| 219 | ;; until the relevant (possibly &rest/&body) pattern |
| 220 | ;; is reached. |
| 221 | ;; n is set to (1- n) and method to (cdr method) |
| 222 | ;; each iteration. |
| 223 | (setq tem (car method)) |
| 224 | |
| 225 | (or (eq tem 'nil) ;default indentation |
| 226 | ; (eq tem '&lambda) ;abbrev for (&whole 4 (&rest 1)) |
| 227 | (and (eq tem '&body) (null (cdr method))) |
| 228 | (and (eq tem '&rest) |
| 229 | (consp (cdr method)) (null (cdr (cdr method)))) |
| 230 | (integerp tem) ;explicit indentation specified |
| 231 | (and (consp tem) ;destructuring |
| 232 | (eq (car tem) '&whole) |
| 233 | (or (symbolp (car (cdr tem))) |
| 234 | (integerp (car (cdr tem))))) |
| 235 | (and (symbolp tem) ;a function to call to do the work. |
| 236 | (null (cdr method))) |
| 237 | (lisp-indent-report-bad-format method)) |
| 238 | |
| 239 | (cond ((and tail (not (consp tem))) |
| 240 | ;; indent tail of &rest in same way as first elt of rest |
| 241 | (throw 'exit normal-indent)) |
| 242 | ((eq tem '&body) |
| 243 | ;; &body means (&rest <lisp-body-indent>) |
| 244 | (throw 'exit |
| 245 | (if (and (= n 0) ;first body form |
| 246 | (null p)) ;not in subforms |
| 247 | (+ sexp-column |
| 248 | lisp-body-indent) |
| 249 | normal-indent))) |
| 250 | ((eq tem '&rest) |
| 251 | ;; this pattern holds for all remaining forms |
| 252 | (setq tail (> n 0) |
| 253 | n 0 |
| 254 | method (cdr method))) |
| 255 | ((> n 0) |
| 256 | ;; try next element of pattern |
| 257 | (setq n (1- n) |
| 258 | method (cdr method)) |
| 259 | (if (< n 0) |
| 260 | ;; Too few elements in pattern. |
| 261 | (throw 'exit normal-indent))) |
| 262 | ((eq tem 'nil) |
| 263 | (throw 'exit (list normal-indent containing-form-start))) |
| 264 | ; ((eq tem '&lambda) |
| 265 | ; ;; abbrev for (&whole 4 &rest 1) |
| 266 | ; (throw 'exit |
| 267 | ; (cond ((null p) |
| 268 | ; (list (+ sexp-column 4) containing-form-start)) |
| 269 | ; ((null (cdr p)) |
| 270 | ; (+ sexp-column 1)) |
| 271 | ; (t normal-indent)))) |
| 272 | ((integerp tem) |
| 273 | (throw 'exit |
| 274 | (if (null p) ;not in subforms |
| 275 | (list (+ sexp-column tem) containing-form-start) |
| 276 | normal-indent))) |
| 277 | ((symbolp tem) ;a function to call |
| 278 | (throw 'exit |
| 279 | (funcall tem path state indent-point |
| 280 | sexp-column normal-indent))) |
| 281 | (t |
| 282 | ;; must be a destructing frob |
| 283 | (if (not (null p)) |
| 284 | ;; descend |
| 285 | (setq method (cdr (cdr tem)) |
| 286 | n nil) |
| 287 | (setq tem (car (cdr tem))) |
| 288 | (throw 'exit |
| 289 | (cond (tail |
| 290 | normal-indent) |
| 291 | ((eq tem 'nil) |
| 292 | (list normal-indent |
| 293 | containing-form-start)) |
| 294 | ((integerp tem) |
| 295 | (list (+ sexp-column tem) |
| 296 | containing-form-start)) |
| 297 | (t |
| 298 | (funcall tem path state indent-point |
| 299 | sexp-column normal-indent)))))))))))) |
| 300 | \f |
| 301 | (defun lisp-indent-tagbody (path state indent-point sexp-column normal-indent) |
| 302 | (if (not (null (cdr path))) |
| 303 | normal-indent |
| 304 | (save-excursion |
| 305 | (goto-char indent-point) |
| 306 | (beginning-of-line) |
| 307 | (skip-chars-forward " \t") |
| 308 | (list (cond ((looking-at "\\sw\\|\\s_") |
| 309 | ;; a tagbody tag |
| 310 | (+ sexp-column lisp-tag-indentation)) |
| 311 | ((integerp lisp-tag-body-indentation) |
| 312 | (+ sexp-column lisp-tag-body-indentation)) |
| 313 | ((eq lisp-tag-body-indentation 't) |
| 314 | (condition-case () |
| 315 | (progn (backward-sexp 1) (current-column)) |
| 316 | (error (1+ sexp-column)))) |
| 317 | (t (+ sexp-column lisp-body-indent))) |
| 318 | ; (cond ((integerp lisp-tag-body-indentation) |
| 319 | ; (+ sexp-column lisp-tag-body-indentation)) |
| 320 | ; ((eq lisp-tag-body-indentation 't) |
| 321 | ; normal-indent) |
| 322 | ; (t |
| 323 | ; (+ sexp-column lisp-body-indent))) |
| 324 | (elt state 1) |
| 325 | )))) |
| 326 | |
| 327 | (defun lisp-indent-do (path state indent-point sexp-column normal-indent) |
| 328 | (if (>= (car path) 3) |
| 329 | (let ((lisp-tag-body-indentation lisp-body-indent)) |
| 330 | (funcall (function lisp-indent-tagbody) |
| 331 | path state indent-point sexp-column normal-indent)) |
| 332 | (funcall (function lisp-indent-259) |
| 333 | '((&whole nil &rest |
| 334 | ;; the following causes wierd indentation |
| 335 | ;;(&whole 1 1 2 nil) |
| 336 | ) |
| 337 | (&whole nil &rest 1)) |
| 338 | path state indent-point sexp-column normal-indent))) |
| 339 | |
| 340 | (defun lisp-indent-function-lambda-hack (path state indent-point |
| 341 | sexp-column normal-indent) |
| 342 | ;; indent (function (lambda () <newline> <body-forms>)) kludgily. |
| 343 | (if (or (cdr path) ; wtf? |
| 344 | (> (car path) 3)) |
| 345 | ;; line up under previous body form |
| 346 | normal-indent |
| 347 | ;; line up under function rather than under lambda in order to |
| 348 | ;; conserve horizontal space. (Which is what #' is for.) |
| 349 | (condition-case () |
| 350 | (save-excursion |
| 351 | (backward-up-list 2) |
| 352 | (forward-char 1) |
| 353 | (if (looking-at "\\(lisp:+\\)?function\\(\\Sw\\|\\S_\\)") |
| 354 | (+ lisp-body-indent -1 (current-column)) |
| 355 | (+ sexp-column lisp-body-indent))) |
| 356 | (error (+ sexp-column lisp-body-indent))))) |
| 357 | |
| 358 | \f |
| 359 | (let ((l '((block 1) |
| 360 | (catch 1) |
| 361 | (case (4 &rest (&whole 2 &rest 1))) |
| 362 | (ccase . case) (ecase . case) |
| 363 | (typecase . case) (etypecase . case) (ctypecase . case) |
| 364 | (catch 1) |
| 365 | (cond (&rest (&whole 2 &rest 1))) |
| 366 | (block 1) |
| 367 | (defvar (4 2 2)) |
| 368 | (defconstant . defvar) (defparameter . defvar) |
| 369 | (define-modify-macro |
| 370 | (4 &body)) |
| 371 | (define-setf-method |
| 372 | (4 (&whole 4 &rest 1) &body)) |
| 373 | (defsetf (4 (&whole 4 &rest 1) 4 &body)) |
| 374 | (defun (4 (&whole 4 &rest 1) &body)) |
| 375 | (defmacro . defun) (deftype . defun) |
| 376 | (defstruct ((&whole 4 &rest (&whole 2 &rest 1)) |
| 377 | &rest (&whole 2 &rest 1))) |
| 378 | (destructuring-bind |
| 379 | ((&whole 6 &rest 1) 4 &body)) |
| 380 | (do lisp-indent-do) |
| 381 | (do* . do) |
| 382 | (dolist ((&whole 4 2 1) &body)) |
| 383 | (dotimes . dolist) |
| 384 | (eval-when 1) |
| 385 | (flet ((&whole 4 &rest (&whole 1 (&whole 4 &rest 1) &body)) |
| 386 | &body)) |
| 387 | (labels . flet) |
| 388 | (macrolet . flet) |
| 389 | ;; `else-body' style |
| 390 | (if (nil nil &body)) |
| 391 | ;; single-else style (then and else equally indented) |
| 392 | (if (&rest nil)) |
| 393 | ;(lambda ((&whole 4 &rest 1) &body)) |
| 394 | (lambda ((&whole 4 &rest 1) |
| 395 | &rest lisp-indent-function-lambda-hack)) |
| 396 | (let ((&whole 4 &rest (&whole 1 1 2)) &body)) |
| 397 | (let* . let) |
| 398 | (compiler-let . let) ;barf |
| 399 | (locally 1) |
| 400 | ;(loop ...) |
| 401 | (multiple-value-bind |
| 402 | ((&whole 6 &rest 1) 4 &body)) |
| 403 | (multiple-value-call |
| 404 | (4 &body)) |
| 405 | (multiple-value-list 1) |
| 406 | (multiple-value-prog1 1) |
| 407 | (multiple-value-setq |
| 408 | (4 2)) |
| 409 | ;; Combines the worst features of BLOCK, LET and TAGBODY |
| 410 | (prog ((&whole 4 &rest 1) &rest lisp-indent-tagbody)) |
| 411 | (prog* . prog) |
| 412 | (prog1 1) |
| 413 | (prog2 2) |
| 414 | (progn 0) |
| 415 | (progv (4 4 &body)) |
| 416 | (return 0) |
| 417 | (return-from (nil &body)) |
| 418 | (tagbody lisp-indent-tagbody) |
| 419 | (throw 1) |
| 420 | (unless 1) |
| 421 | (unwind-protect |
| 422 | (5 &body)) |
| 423 | (when 1)))) |
| 424 | (while l |
| 425 | (put (car (car l)) 'common-lisp-indent-function |
| 426 | (if (symbolp (cdr (car l))) |
| 427 | (get (cdr (car l)) 'common-lisp-indent-function) |
| 428 | (car (cdr (car l))))) |
| 429 | (setq l (cdr l)))) |
| 430 | |
| 431 | \f |
| 432 | ;(defun foo (x) |
| 433 | ; (tagbody |
| 434 | ; foo |
| 435 | ; (bar) |
| 436 | ; baz |
| 437 | ; (when (losing) |
| 438 | ; (with-big-loser |
| 439 | ; (yow) |
| 440 | ; ((lambda () |
| 441 | ; foo) |
| 442 | ; big))) |
| 443 | ; (flet ((foo (bar baz zap) |
| 444 | ; (zip)) |
| 445 | ; (zot () |
| 446 | ; quux)) |
| 447 | ; (do () |
| 448 | ; ((lose) |
| 449 | ; (foo 1)) |
| 450 | ; (quux) |
| 451 | ; foo |
| 452 | ; (lose)) |
| 453 | ; (cond ((x) |
| 454 | ; (win 1 2 |
| 455 | ; (foo))) |
| 456 | ; (t |
| 457 | ; (lose |
| 458 | ; 3)))))) |
| 459 | |
| 460 | |
| 461 | ;(put 'while 'common-lisp-indent-function 1) |
| 462 | ;(put 'defwrapper'common-lisp-indent-function ...) |
| 463 | ;(put 'def 'common-lisp-indent-function ...) |
| 464 | ;(put 'defflavor 'common-lisp-indent-function ...) |
| 465 | ;(put 'defsubst 'common-lisp-indent-function ...) |
| 466 | |
| 467 | ;(put 'with-restart 'common-lisp-indent-function '((1 4 ((* 1))) (2 &body))) |
| 468 | ;(put 'restart-case 'common-lisp-indent-function '((1 4) (* 2 ((0 1) (* 1))))) |
| 469 | ;(put 'define-condition 'common-lisp-indent-function '((1 6) (2 6 ((* 1))) (3 4 ((* 1))) (4 &body))) |
| 470 | ;(put 'with-condition-handler 'common-lisp-indent-function '((1 4 ((* 1))) (2 &body))) |
| 471 | ;(put 'condition-case 'common-lisp-indent-function '((1 4) (* 2 ((0 1) (1 3) (2 &body))))) |
| 472 | |
| 473 | ;;; cl-indent.el ends here |