ruby-mode.el 73.1 KB
Newer Older
Chong Yidong's avatar
Chong Yidong committed
1 2
;;; ruby-mode.el --- Major mode for editing Ruby files

3
;; Copyright (C) 1994-2013 Free Software Foundation, Inc.
Chong Yidong's avatar
Chong Yidong committed
4

5 6
;; Authors: Yukihiro Matsumoto
;;	Nobuyoshi Nakada
Chong Yidong's avatar
Chong Yidong committed
7 8 9
;; URL: http://www.emacswiki.org/cgi-bin/wiki/RubyMode
;; Created: Fri Feb  4 14:49:13 JST 1994
;; Keywords: languages ruby
10
;; Version: 1.2
Chong Yidong's avatar
Chong Yidong committed
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

;; 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 <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Provides font-locking, indentation support, and navigation for Ruby code.
;;
;; If you're installing manually, you should add this to your .emacs
;; file after putting it on your load path:
;;
;;    (autoload 'ruby-mode "ruby-mode" "Major mode for ruby files" t)
;;    (add-to-list 'auto-mode-alist '("\\.rb$" . ruby-mode))
;;    (add-to-list 'interpreter-mode-alist '("ruby" . ruby-mode))
;;
;; Still needs more docstrings; search below for TODO.

;;; Code:

(eval-when-compile (require 'cl))

44 45 46 47 48
(defgroup ruby nil
  "Major mode for editing Ruby code."
  :prefix "ruby-"
  :group 'languages)

Chong Yidong's avatar
Chong Yidong committed
49 50 51 52 53 54 55 56 57
(defconst ruby-block-beg-keywords
  '("class" "module" "def" "if" "unless" "case" "while" "until" "for" "begin" "do")
  "Keywords at the beginning of blocks.")

(defconst ruby-block-beg-re
  (regexp-opt ruby-block-beg-keywords)
  "Regexp to match the beginning of blocks.")

(defconst ruby-non-block-do-re
58
  (regexp-opt '("while" "until" "for" "rescue") 'symbols)
Chong Yidong's avatar
Chong Yidong committed
59 60 61
  "Regexp to match keywords that nest without blocks.")

(defconst ruby-indent-beg-re
62 63 64
  (concat "^\\(\\s *" (regexp-opt '("class" "module" "def")) "\\|"
          (regexp-opt '("if" "unless" "case" "while" "until" "for" "begin"))
          "\\)\\_>")
Chong Yidong's avatar
Chong Yidong committed
65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94
  "Regexp to match where the indentation gets deeper.")

(defconst ruby-modifier-beg-keywords
  '("if" "unless" "while" "until")
  "Modifiers that are the same as the beginning of blocks.")

(defconst ruby-modifier-beg-re
  (regexp-opt ruby-modifier-beg-keywords)
  "Regexp to match modifiers same as the beginning of blocks.")

(defconst ruby-modifier-re
  (regexp-opt (cons "rescue" ruby-modifier-beg-keywords))
  "Regexp to match modifiers.")

(defconst ruby-block-mid-keywords
  '("then" "else" "elsif" "when" "rescue" "ensure")
  "Keywords where the indentation gets shallower in middle of block statements.")

(defconst ruby-block-mid-re
  (regexp-opt ruby-block-mid-keywords)
  "Regexp to match where the indentation gets shallower in middle of block statements.")

(defconst ruby-block-op-keywords
  '("and" "or" "not")
  "Regexp to match boolean keywords.")

(defconst ruby-block-hanging-re
  (regexp-opt (append ruby-modifier-beg-keywords ruby-block-op-keywords))
  "Regexp to match hanging block modifiers.")

95
(defconst ruby-block-end-re "\\_<end\\_>")
Chong Yidong's avatar
Chong Yidong committed
96

Dmitry Gutov's avatar
Dmitry Gutov committed
97 98 99 100
(defconst ruby-defun-beg-re
  '"\\(def\\|class\\|module\\)"
  "Regexp to match the beginning of a defun, in the general sense.")

101 102 103 104
(defconst ruby-singleton-class-re
  "class\\s *<<"
  "Regexp to match the beginning of a singleton class context.")

105 106
(eval-and-compile
  (defconst ruby-here-doc-beg-re
Chong Yidong's avatar
Chong Yidong committed
107
  "\\(<\\)<\\(-\\)?\\(\\([a-zA-Z0-9_]+\\)\\|[\"]\\([^\"]+\\)[\"]\\|[']\\([^']+\\)[']\\)"
Dmitry Gutov's avatar
Dmitry Gutov committed
108 109 110
  "Regexp to match the beginning of a heredoc.")

  (defconst ruby-expression-expansion-re
111
    "\\(?:[^\\]\\|\\=\\)\\(\\\\\\\\\\)*\\(#\\({[^}\n\\\\]*\\(\\\\.[^}\n\\\\]*\\)*}\\|\\(\\$\\|@\\|@@\\)\\(\\w\\|_\\)+\\)\\)"))
Chong Yidong's avatar
Chong Yidong committed
112 113 114 115 116 117 118 119 120 121 122 123 124

(defun ruby-here-doc-end-match ()
  "Return a regexp to find the end of a heredoc.

This should only be called after matching against `ruby-here-doc-beg-re'."
  (concat "^"
          (if (match-string 2) "[ \t]*" nil)
          (regexp-quote
           (or (match-string 4)
               (match-string 5)
               (match-string 6)))))

(defconst ruby-delimiter
125
  (concat "[?$/%(){}#\"'`.:]\\|<<\\|\\[\\|\\]\\|\\_<\\("
Chong Yidong's avatar
Chong Yidong committed
126
          ruby-block-beg-re
127
          "\\)\\_>\\|" ruby-block-end-re
Chong Yidong's avatar
Chong Yidong committed
128 129 130 131 132 133 134
          "\\|^=begin\\|" ruby-here-doc-beg-re))

(defconst ruby-negative
  (concat "^[ \t]*\\(\\(" ruby-block-mid-re "\\)\\>\\|"
          ruby-block-end-re "\\|}\\|\\]\\)")
  "Regexp to match where the indentation gets shallower.")

135
(defconst ruby-operator-re "[-,.+*/%&|^~=<>:]\\|\\\\$"
Chong Yidong's avatar
Chong Yidong committed
136 137 138 139
  "Regexp to match operators.")

(defconst ruby-symbol-chars "a-zA-Z0-9_"
  "List of characters that symbol names may contain.")
140

Chong Yidong's avatar
Chong Yidong committed
141 142 143
(defconst ruby-symbol-re (concat "[" ruby-symbol-chars "]")
  "Regexp to match symbols.")

144
(defvar ruby-use-smie t)
145

Chong Yidong's avatar
Chong Yidong committed
146 147
(defvar ruby-mode-map
  (let ((map (make-sparse-keymap)))
148 149 150 151
    (unless ruby-use-smie
      (define-key map (kbd "M-C-b") 'ruby-backward-sexp)
      (define-key map (kbd "M-C-f") 'ruby-forward-sexp)
      (define-key map (kbd "M-C-q") 'ruby-indent-exp))
152 153
    (when ruby-use-smie
      (define-key map (kbd "M-C-d") 'smie-down-list))
Chong Yidong's avatar
Chong Yidong committed
154 155
    (define-key map (kbd "M-C-p") 'ruby-beginning-of-block)
    (define-key map (kbd "M-C-n") 'ruby-end-of-block)
156
    (define-key map (kbd "C-c {") 'ruby-toggle-block)
Chong Yidong's avatar
Chong Yidong committed
157
    map)
158
  "Keymap used in Ruby mode.")
Chong Yidong's avatar
Chong Yidong committed
159

160 161 162 163 164
(easy-menu-define
  ruby-mode-menu
  ruby-mode-map
  "Ruby Mode Menu"
  '("Ruby"
165 166
    ["Beginning of Block" ruby-beginning-of-block t]
    ["End of Block" ruby-end-of-block t]
167 168 169
    ["Toggle Block" ruby-toggle-block t]
    "--"
    ["Backward Sexp" ruby-backward-sexp
170 171 172
     :visible (not ruby-use-smie)]
    ["Backward Sexp" backward-sexp
     :visible ruby-use-smie]
173
    ["Forward Sexp" ruby-forward-sexp
174 175 176 177 178 179 180
     :visible (not ruby-use-smie)]
    ["Forward Sexp" forward-sexp
     :visible ruby-use-smie]
    ["Indent Sexp" ruby-indent-exp
     :visible (not ruby-use-smie)]
    ["Indent Sexp" prog-indent-sexp
     :visible ruby-use-smie]))
181

Chong Yidong's avatar
Chong Yidong committed
182 183 184 185 186 187 188 189 190 191 192
(defvar ruby-mode-syntax-table
  (let ((table (make-syntax-table)))
    (modify-syntax-entry ?\' "\"" table)
    (modify-syntax-entry ?\" "\"" table)
    (modify-syntax-entry ?\` "\"" table)
    (modify-syntax-entry ?# "<" table)
    (modify-syntax-entry ?\n ">" table)
    (modify-syntax-entry ?\\ "\\" table)
    (modify-syntax-entry ?$ "." table)
    (modify-syntax-entry ?? "_" table)
    (modify-syntax-entry ?_ "_" table)
193
    (modify-syntax-entry ?: "_" table)
Chong Yidong's avatar
Chong Yidong committed
194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
    (modify-syntax-entry ?< "." table)
    (modify-syntax-entry ?> "." table)
    (modify-syntax-entry ?& "." table)
    (modify-syntax-entry ?| "." table)
    (modify-syntax-entry ?% "." table)
    (modify-syntax-entry ?= "." table)
    (modify-syntax-entry ?/ "." table)
    (modify-syntax-entry ?+ "." table)
    (modify-syntax-entry ?* "." table)
    (modify-syntax-entry ?- "." table)
    (modify-syntax-entry ?\; "." table)
    (modify-syntax-entry ?\( "()" table)
    (modify-syntax-entry ?\) ")(" table)
    (modify-syntax-entry ?\{ "(}" table)
    (modify-syntax-entry ?\} "){" table)
    (modify-syntax-entry ?\[ "(]" table)
    (modify-syntax-entry ?\] ")[" table)
    table)
212
  "Syntax table to use in Ruby mode.")
Chong Yidong's avatar
Chong Yidong committed
213 214

(defcustom ruby-indent-tabs-mode nil
215
  "Indentation can insert tabs in Ruby mode if this is non-nil."
216 217 218
  :type 'boolean
  :group 'ruby
  :safe 'booleanp)
Chong Yidong's avatar
Chong Yidong committed
219 220

(defcustom ruby-indent-level 2
221
  "Indentation of Ruby statements."
222 223 224
  :type 'integer
  :group 'ruby
  :safe 'integerp)
Chong Yidong's avatar
Chong Yidong committed
225

226
(defcustom ruby-comment-column (default-value 'comment-column)
Chong Yidong's avatar
Chong Yidong committed
227
  "Indentation column of comments."
228 229 230
  :type 'integer
  :group 'ruby
  :safe 'integerp)
Chong Yidong's avatar
Chong Yidong committed
231 232 233 234

(defcustom ruby-deep-arglist t
  "Deep indent lists in parenthesis when non-nil.
Also ignores spaces after parenthesis when 'space."
235 236 237
  :type 'boolean
  :group 'ruby
  :safe 'booleanp)
Chong Yidong's avatar
Chong Yidong committed
238 239

(defcustom ruby-deep-indent-paren '(?\( ?\[ ?\] t)
240 241
  "Deep indent lists in parenthesis when non-nil.
The value t means continuous line.
Chong Yidong's avatar
Chong Yidong committed
242 243 244 245 246 247 248
Also ignores spaces after parenthesis when 'space."
  :group 'ruby)

(defcustom ruby-deep-indent-paren-style 'space
  "Default deep indent style."
  :options '(t nil space) :group 'ruby)

249 250 251 252 253 254 255 256 257
(defcustom ruby-encoding-map
  '((us-ascii       . nil)       ;; Do not put coding: us-ascii
    (shift-jis      . cp932)     ;; Emacs charset name of Shift_JIS
    (shift_jis      . cp932)     ;; MIME charset name of Shift_JIS
    (japanese-cp932 . cp932))    ;; Emacs charset name of CP932
  "Alist to map encoding name from Emacs to Ruby.
Associating an encoding name with nil means it needs not be
explicitly declared in magic comment."
  :type '(repeat (cons (symbol :tag "From") (symbol :tag "To")))
Chong Yidong's avatar
Chong Yidong committed
258 259 260
  :group 'ruby)

(defcustom ruby-insert-encoding-magic-comment t
261
  "Insert a magic Emacs 'coding' comment upon save if this is non-nil."
Chong Yidong's avatar
Chong Yidong committed
262 263 264 265 266 267
  :type 'boolean :group 'ruby)

(defcustom ruby-use-encoding-map t
  "Use `ruby-encoding-map' to set encoding magic comment if this is non-nil."
  :type 'boolean :group 'ruby)

268 269 270 271
;;; SMIE support

(require 'smie)

272 273
;; Here's a simplified BNF grammar, for reference:
;; http://www.cse.buffalo.edu/~regan/cse305/RubyBNF.pdf
274 275
(defconst ruby-smie-grammar
  (smie-prec2->grammar
276 277 278 279 280 281
   (smie-merge-prec2s
    (smie-bnf->prec2
     '((id)
       (insts (inst) (insts ";" insts))
       (inst (exp) (inst "iuwu-mod" exp))
       (exp  (exp1) (exp "," exp) (exp "=" exp)
282 283
             (id " @ " exp)
             (exp "." exp))
284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
       (exp1 (exp2) (exp2 "?" exp1 ":" exp1))
       (exp2 ("def" insts "end")
             ("begin" insts-rescue-insts "end")
             ("do" insts "end")
             ("class" insts "end") ("module" insts "end")
             ("for" for-body "end")
             ("[" expseq "]")
             ("{" hashvals "}")
             ("{" insts "}")
             ("while" insts "end")
             ("until" insts "end")
             ("unless" insts "end")
             ("if" if-body "end")
             ("case"  cases "end"))
       (formal-params ("opening-|" exp "|"))
       (for-body (for-head ";" insts))
       (for-head (id "in" exp))
       (cases (exp "then" insts) ;; FIXME: Ruby also allows (exp ":" insts).
              (cases "when" cases) (insts "else" insts))
       (expseq (exp) );;(expseq "," expseq)
       (hashvals (id "=>" exp1) (hashvals "," hashvals))
       (insts-rescue-insts (insts)
                           (insts-rescue-insts "rescue" insts-rescue-insts)
                           (insts-rescue-insts "ensure" insts-rescue-insts))
       (itheni (insts) (exp "then" insts))
       (ielsei (itheni) (itheni "else" insts))
       (if-body (ielsei) (if-body "elsif" if-body)))
     '((nonassoc "in") (assoc ";") (right " @ ")
312
       (assoc ",") (right "=") (assoc "."))
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332
     '((assoc "when"))
     '((assoc "elsif"))
     '((assoc "rescue" "ensure"))
     '((assoc ",")))

    (smie-precs->prec2
     '((right "=")
       (right "+=" "-=" "*=" "/=" "%=" "**=" "&=" "|=" "^="
              "<<=" ">>=" "&&=" "||=")
       (left ".." "...")
       (left "+" "-")
       (left "*" "/" "%" "**")
       ;; (left "|") ; FIXME: Conflicts with | after block parameters.
       (left "^" "&")
       (nonassoc "<=>")
       (nonassoc ">" ">=" "<" "<=")
       (nonassoc "==" "===" "!=")
       (nonassoc "=~" "!~")
       (left "<<" ">>")
       (left "&&" "||"))))))
333 334 335

(defun ruby-smie--bosp ()
  (save-excursion (skip-chars-backward " \t")
336
                  (or (bolp) (memq (char-before) '(?\; ?=)))))
337 338 339 340 341

(defun ruby-smie--implicit-semi-p ()
  (save-excursion
    (skip-chars-backward " \t")
    (not (or (bolp)
342
             (and (memq (char-before)
343
                        '(?\; ?- ?+ ?* ?/ ?: ?. ?, ?\[ ?\( ?\{ ?\\ ?& ?> ?< ?% ?~))
344 345
                  ;; Make sure it's not the end of a regexp.
                  (not (eq (car (syntax-after (1- (point)))) 7)))
346 347 348 349 350
             (and (eq (char-before) ?\?)
                  (equal (save-excursion (ruby-smie--backward-token)) "?"))
             (and (eq (char-before) ?=)
                  (string-match "\\`\\s." (save-excursion
                                            (ruby-smie--backward-token))))
351 352 353
             (and (eq (car (syntax-after (1- (point)))) 2)
                  (equal (save-excursion (ruby-smie--backward-token))
                         "iuwu-mod"))
354 355 356
             (save-excursion
               (forward-comment 1)
               (eq (char-after) ?.))))))
357

358 359 360
(defun ruby-smie--redundant-do-p (&optional skip)
  (save-excursion
    (if skip (backward-word 1))
361
    (member (nth 2 (smie-backward-sexp ";")) '("while" "until" "for"))))
362

363 364 365 366 367 368
(defun ruby-smie--opening-pipe-p ()
  (save-excursion
    (if (eq ?| (char-before)) (forward-char -1))
    (skip-chars-backward " \t\n")
    (or (eq ?\{ (char-before))
        (looking-back "\\_<do" (- (point) 2)))))
369

370 371
(defun ruby-smie--args-separator-p (pos)
  (and
372
   (< pos (line-end-position))
373
   (or (eq (char-syntax (preceding-char)) '?w)
374 375
       ;; FIXME: Check that the preceding token is not a keyword.
       ;; This isn't very important most of the time, though.
376 377
       (and (memq (preceding-char) '(?! ??))
            (eq (char-syntax (char-before (1- (point)))) '?w)))
378 379 380 381 382 383 384 385
   (or (and (eq (char-syntax (char-after pos)) ?w)
            (not (looking-at (regexp-opt '("unless" "if" "while" "until"
                                           "else" "elsif" "do" "end")
                                         'symbols))))
       (memq (syntax-after pos) '(7 15))
       (save-excursion
         (goto-char pos)
         (looking-at "\\s(\\|[-+!~:]\\sw")))))
386

387
(defun ruby-smie--at-dot-call ()
388
  (and (eq ?w (char-syntax (following-char)))
389 390
       (eq (char-before) ?.)
       (not (eq (char-before (1- (point))) ?.))))
391

392
(defun ruby-smie--forward-token ()
393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410
  (let ((pos (point)))
    (skip-chars-forward " \t")
    (cond
     ((looking-at "\\s\"") "")          ;A heredoc or a string.
     ((and (looking-at "[\n#]")
           (ruby-smie--implicit-semi-p)) ;Only add implicit ; when needed.
      (if (eolp) (forward-char 1) (forward-comment 1))
      ";")
     (t
      (forward-comment (point-max))
      (cond
       ((looking-at ":\\s.+")
        (goto-char (match-end 0)) (match-string 0)) ;; bug#15208.
       ((and (< pos (point))
             (save-excursion
               (ruby-smie--args-separator-p (prog1 (point) (goto-char pos)))))
        " @ ")
       (t
411 412 413 414
        (let ((dot (ruby-smie--at-dot-call))
              (tok (smie-default-forward-token)))
          (when dot
            (setq tok (concat "." tok)))
415
          (cond
416 417 418 419 420 421 422 423 424 425 426 427 428 429 430
           ((member tok '("unless" "if" "while" "until"))
            (if (save-excursion (forward-word -1) (ruby-smie--bosp))
                tok "iuwu-mod"))
           ((equal tok "|")
            (if (ruby-smie--opening-pipe-p) "opening-|" tok))
           ((and (equal tok "") (looking-at "\\\\\n"))
            (goto-char (match-end 0)) (ruby-smie--forward-token))
           ((equal tok "do")
            (cond
             ((not (ruby-smie--redundant-do-p 'skip)) tok)
             ((> (save-excursion (forward-comment (point-max)) (point))
                 (line-end-position))
              (ruby-smie--forward-token)) ;Fully redundant.
             (t ";")))
           (t tok)))))))))
431 432 433 434

(defun ruby-smie--backward-token ()
  (let ((pos (point)))
    (forward-comment (- (point)))
435 436 437 438
    (cond
     ((and (> pos (line-end-position)) (ruby-smie--implicit-semi-p))
      (skip-chars-forward " \t") ";")
     ((and (bolp) (not (bobp))) "")         ;Presumably a heredoc.
439 440 441 442 443 444
     ((and (> pos (point)) (not (bolp))
           (ruby-smie--args-separator-p pos))
      ;; We have "ID SPC ID", which is a method call, but it binds less tightly
      ;; than commas, since a method call can also be "ID ARG1, ARG2, ARG3".
      ;; In some textbooks, "e1 @ e2" is used to mean "call e1 with arg e2".
      " @ ")
445
     (t
446 447 448
      (let ((tok (smie-default-backward-token))
            (dot (ruby-smie--at-dot-call)))
        (when dot
449
          (setq tok (concat "." tok)))
450 451
        (when (and (eq ?: (char-before)) (string-match "\\`\\s." tok))
          (forward-char -1) (setq tok (concat ":" tok))) ;; bug#15208.
452 453 454 455
        (cond
         ((member tok '("unless" "if" "while" "until"))
          (if (ruby-smie--bosp)
              tok "iuwu-mod"))
456 457
         ((equal tok "|")
          (if (ruby-smie--opening-pipe-p) "opening-|" tok))
458 459
         ((and (equal tok "") (eq ?\\ (char-before)) (looking-at "\n"))
          (forward-char -1) (ruby-smie--backward-token))
460 461 462 463 464 465 466 467
         ((equal tok "do")
          (cond
           ((not (ruby-smie--redundant-do-p)) tok)
           ((> (save-excursion (forward-word 1)
                               (forward-comment (point-max)) (point))
               (line-end-position))
            (ruby-smie--backward-token)) ;Fully redundant.
           (t ";")))
468
         (t tok)))))))
469 470 471 472

(defun ruby-smie-rules (kind token)
  (pcase (cons kind token)
    (`(:elem . basic) ruby-indent-level)
473 474 475 476
    ;; "foo" "bar" is the concatenation of the two strings, so the second
    ;; should be aligned with the first.
    (`(:elem . args) (if (looking-at "\\s\"") 0))
    ;; (`(:after . ",") (smie-rule-separator kind))
477
    (`(:before . ";")
478 479 480 481
     (cond
      ((smie-rule-parent-p "def" "begin" "do" "class" "module" "for"
                           "while" "until" "unless"
                           "if" "then" "elsif" "else" "when"
482
                           "rescue" "ensure" "{")
483 484 485
       (smie-rule-parent ruby-indent-level))
      ;; For (invalid) code between switch and case.
      ;; (if (smie-parent-p "switch") 4)
486
      ))
487
    (`(:before . ,(or `"(" `"[" `"{"))
488 489
     (cond
      ((and (equal token "{")
490
            (not (smie-rule-prev-p "(" "{" "[" "," "=>" "=" "return" ";")))
491
       ;; Curly block opener.
492
       (smie-rule-parent))
493 494 495 496 497 498
      ((smie-rule-hanging-p)
       ;; Treat purely syntactic block-constructs as being part of their parent,
       ;; when the opening statement is hanging.
       (let ((state (smie-backward-sexp 'halfsexp)))
         (when (eq t (car state)) (goto-char (cadr state))))
       (cons 'column  (smie-indent-virtual)))))
499
    (`(:after . ,(or "=" "iuwu-mod")) 2)
500
    (`(:after . " @ ") (smie-rule-parent))
501
    (`(:before . "do") (smie-rule-parent))
502 503 504
    (`(,(or :before :after) . ".")
     (unless (smie-rule-parent-p ".")
       (smie-rule-parent ruby-indent-level)))
505
    (`(:before . ,(or `"else" `"then" `"elsif" `"rescue" `"ensure")) 0)
506 507
    (`(:before . ,(or `"when"))
     (if (not (smie-rule-sibling-p)) 0)) ;; ruby-indent-level
508 509
    (`(:after . "+")       ;FIXME: Probably applicable to most infix operators.
     (if (smie-rule-parent-p ";") ruby-indent-level))
510
    ))
511

Chong Yidong's avatar
Chong Yidong committed
512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561
(defun ruby-imenu-create-index-in-block (prefix beg end)
  "Create an imenu index of methods inside a block."
  (let ((index-alist '()) (case-fold-search nil)
        name next pos decl sing)
    (goto-char beg)
    (while (re-search-forward "^\\s *\\(\\(class\\s +\\|\\(class\\s *<<\\s *\\)\\|module\\s +\\)\\([^\(<\n ]+\\)\\|\\(def\\|alias\\)\\s +\\([^\(\n ]+\\)\\)" end t)
      (setq sing (match-beginning 3))
      (setq decl (match-string 5))
      (setq next (match-end 0))
      (setq name (or (match-string 4) (match-string 6)))
      (setq pos (match-beginning 0))
      (cond
       ((string= "alias" decl)
        (if prefix (setq name (concat prefix name)))
        (push (cons name pos) index-alist))
       ((string= "def" decl)
        (if prefix
            (setq name
                  (cond
                   ((string-match "^self\." name)
                    (concat (substring prefix 0 -1) (substring name 4)))
                  (t (concat prefix name)))))
        (push (cons name pos) index-alist)
        (ruby-accurate-end-of-block end))
       (t
        (if (string= "self" name)
            (if prefix (setq name (substring prefix 0 -1)))
          (if prefix (setq name (concat (substring prefix 0 -1) "::" name)))
          (push (cons name pos) index-alist))
        (ruby-accurate-end-of-block end)
        (setq beg (point))
        (setq index-alist
              (nconc (ruby-imenu-create-index-in-block
                      (concat name (if sing "." "#"))
                      next beg) index-alist))
        (goto-char beg))))
    index-alist))

(defun ruby-imenu-create-index ()
  "Create an imenu index of all methods in the buffer."
  (nreverse (ruby-imenu-create-index-in-block nil (point-min) nil)))

(defun ruby-accurate-end-of-block (&optional end)
  "TODO: document."
  (let (state
        (end (or end (point-max))))
    (while (and (setq state (apply 'ruby-parse-partial end state))
                (>= (nth 2 state) 0) (< (point) end)))))

(defun ruby-mode-variables ()
562
  "Set up initial buffer-local variables for Ruby mode."
Chong Yidong's avatar
Chong Yidong committed
563
  (setq indent-tabs-mode ruby-indent-tabs-mode)
564 565 566 567
  (if ruby-use-smie
      (smie-setup ruby-smie-grammar #'ruby-smie-rules
                  :forward-token  #'ruby-smie--forward-token
                  :backward-token #'ruby-smie--backward-token)
568 569 570 571 572 573 574 575 576 577 578
    (setq-local indent-line-function 'ruby-indent-line))
  (setq-local require-final-newline t)
  (setq-local comment-start "# ")
  (setq-local comment-end "")
  (setq-local comment-column ruby-comment-column)
  (setq-local comment-start-skip "#+ *")
  (setq-local parse-sexp-ignore-comments t)
  (setq-local parse-sexp-lookup-properties t)
  (setq-local paragraph-start (concat "$\\|" page-delimiter))
  (setq-local paragraph-separate paragraph-start)
  (setq-local paragraph-ignore-fill-prefix t))
Chong Yidong's avatar
Chong Yidong committed
579 580 581 582 583 584 585 586 587

(defun ruby-mode-set-encoding ()
  "Insert a magic comment header with the proper encoding if necessary."
  (save-excursion
    (widen)
    (goto-char (point-min))
    (when (re-search-forward "[^\0-\177]" nil t)
      (goto-char (point-min))
      (let ((coding-system
588
             (or save-buffer-coding-system
589 590 591 592 593
                 buffer-file-coding-system)))
        (if coding-system
            (setq coding-system
                  (or (coding-system-get coding-system 'mime-charset)
                      (coding-system-change-eol-conversion coding-system nil))))
Chong Yidong's avatar
Chong Yidong committed
594
        (setq coding-system
595 596
              (if coding-system
                  (symbol-name
597 598 599 600
                   (if ruby-use-encoding-map
                       (let ((elt (assq coding-system ruby-encoding-map)))
                         (if elt (cdr elt) coding-system))
                     coding-system))
601
                "ascii-8bit"))
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618
        (when coding-system
          (if (looking-at "^#!") (beginning-of-line 2))
          (cond ((looking-at "\\s *#.*-\*-\\s *\\(en\\)?coding\\s *:\\s *\\([-a-z0-9_]*\\)\\s *\\(;\\|-\*-\\)")
                 (unless (string= (match-string 2) coding-system)
                   (goto-char (match-beginning 2))
                   (delete-region (point) (match-end 2))
                   (and (looking-at "-\*-")
                        (let ((n (skip-chars-backward " ")))
                          (cond ((= n 0) (insert "  ") (backward-char))
                                ((= n -1) (insert " "))
                                ((forward-char)))))
                   (insert coding-system)))
                ((looking-at "\\s *#.*coding\\s *[:=]"))
                (t (when ruby-insert-encoding-magic-comment
                     (insert "# -*- coding: " coding-system " -*-\n"))))
          (when (buffer-modified-p)
            (basic-save-buffer-1)))))))
Chong Yidong's avatar
Chong Yidong committed
619 620 621 622 623 624 625 626

(defun ruby-current-indentation ()
  "Return the indentation level of current line."
  (save-excursion
    (beginning-of-line)
    (back-to-indentation)
    (current-column)))

627
(defun ruby-indent-line (&optional ignored)
628
  "Correct the indentation of the current Ruby line."
Chong Yidong's avatar
Chong Yidong committed
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665
  (interactive)
  (ruby-indent-to (ruby-calculate-indent)))

(defun ruby-indent-to (column)
  "Indent the current line to COLUMN."
  (when column
    (let (shift top beg)
      (and (< column 0) (error "invalid nest"))
      (setq shift (current-column))
      (beginning-of-line)
      (setq beg (point))
      (back-to-indentation)
      (setq top (current-column))
      (skip-chars-backward " \t")
      (if (>= shift top) (setq shift (- shift top))
        (setq shift 0))
      (if (and (bolp)
               (= column top))
          (move-to-column (+ column shift))
        (move-to-column top)
        (delete-region beg (point))
        (beginning-of-line)
        (indent-to column)
        (move-to-column (+ column shift))))))

(defun ruby-special-char-p (&optional pos)
  "Return t if the character before POS is a special character.
If omitted, POS defaults to the current point.
Special characters are `?', `$', `:' when preceded by whitespace,
and `\\' when preceded by `?'."
  (setq pos (or pos (point)))
  (let ((c (char-before pos)) (b (and (< (point-min) pos)
				      (char-before (1- pos)))))
    (cond ((or (eq c ??) (eq c ?$)))
          ((and (eq c ?:) (or (not b) (eq (char-syntax b) ? ))))
          ((eq c ?\\) (eq b ??)))))

666 667 668 669 670
(defun ruby-singleton-class-p (&optional pos)
  (save-excursion
    (when pos (goto-char pos))
    (forward-word -1)
    (and (or (bolp) (not (eq (char-before (point)) ?_)))
671
         (looking-at ruby-singleton-class-re))))
672

Chong Yidong's avatar
Chong Yidong committed
673
(defun ruby-expr-beg (&optional option)
674 675 676
  "Check if point is possibly at the beginning of an expression.
OPTION specifies the type of the expression.
Can be one of `heredoc', `modifier', `expr-qstr', `expr-re'."
Chong Yidong's avatar
Chong Yidong committed
677 678
  (save-excursion
    (store-match-data nil)
679 680
    (let ((space (skip-chars-backward " \t"))
          (start (point)))
Chong Yidong's avatar
Chong Yidong committed
681 682 683 684 685 686 687 688
      (cond
       ((bolp) t)
       ((progn
          (forward-char -1)
          (and (looking-at "\\?")
               (or (eq (char-syntax (char-before (point))) ?w)
                   (ruby-special-char-p))))
        nil)
689 690 691 692
       ((looking-at ruby-operator-re))
       ((eq option 'heredoc)
        (and (< space 0) (not (ruby-singleton-class-p start))))
       ((or (looking-at "[\\[({,;]")
Chong Yidong's avatar
Chong Yidong committed
693 694 695 696 697 698 699 700 701 702 703 704 705
            (and (looking-at "[!?]")
                 (or (not (eq option 'modifier))
                     (bolp)
                     (save-excursion (forward-char -1) (looking-at "\\Sw$"))))
            (and (looking-at ruby-symbol-re)
                 (skip-chars-backward ruby-symbol-chars)
                 (cond
                  ((looking-at (regexp-opt
                                (append ruby-block-beg-keywords
                                        ruby-block-op-keywords
                                        ruby-block-mid-keywords)
                                'words))
                   (goto-char (match-end 0))
706
                   (not (looking-at "\\s_\\|!")))
Chong Yidong's avatar
Chong Yidong committed
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729
                  ((eq option 'expr-qstr)
                   (looking-at "[a-zA-Z][a-zA-z0-9_]* +%[^ \t]"))
                  ((eq option 'expr-re)
                   (looking-at "[a-zA-Z][a-zA-z0-9_]* +/[^ \t]"))
                  (t nil)))))))))

(defun ruby-forward-string (term &optional end no-error expand)
  "TODO: document."
  (let ((n 1) (c (string-to-char term))
        (re (if expand
                (concat "[^\\]\\(\\\\\\\\\\)*\\([" term "]\\|\\(#{\\)\\)")
              (concat "[^\\]\\(\\\\\\\\\\)*[" term "]"))))
    (while (and (re-search-forward re end no-error)
                (if (match-beginning 3)
                    (ruby-forward-string "}{" end no-error nil)
                  (> (setq n (if (eq (char-before (point)) c)
                                     (1- n) (1+ n))) 0)))
      (forward-char -1))
    (cond ((zerop n))
          (no-error nil)
          ((error "unterminated string")))))

(defun ruby-deep-indent-paren-p (c)
730
  "TODO: document."
Chong Yidong's avatar
Chong Yidong committed
731 732 733 734 735 736 737 738 739 740
  (cond ((listp ruby-deep-indent-paren)
         (let ((deep (assoc c ruby-deep-indent-paren)))
           (cond (deep
                  (or (cdr deep) ruby-deep-indent-paren-style))
                 ((memq c ruby-deep-indent-paren)
                  ruby-deep-indent-paren-style))))
        ((eq c ruby-deep-indent-paren) ruby-deep-indent-paren-style)
        ((eq c ?\( ) ruby-deep-arglist)))

(defun ruby-parse-partial (&optional end in-string nest depth pcol indent)
741
  "TODO: document throughout function body."
Chong Yidong's avatar
Chong Yidong committed
742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862
  (or depth (setq depth 0))
  (or indent (setq indent 0))
  (when (re-search-forward ruby-delimiter end 'move)
    (let ((pnt (point)) w re expand)
      (goto-char (match-beginning 0))
      (cond
       ((and (memq (char-before) '(?@ ?$)) (looking-at "\\sw"))
        (goto-char pnt))
       ((looking-at "[\"`]")            ;skip string
        (cond
         ((and (not (eobp))
               (ruby-forward-string (buffer-substring (point) (1+ (point))) end t t))
          nil)
         (t
          (setq in-string (point))
          (goto-char end))))
       ((looking-at "'")
        (cond
         ((and (not (eobp))
               (re-search-forward "[^\\]\\(\\\\\\\\\\)*'" end t))
          nil)
         (t
          (setq in-string (point))
          (goto-char end))))
       ((looking-at "/=")
        (goto-char pnt))
       ((looking-at "/")
        (cond
         ((and (not (eobp)) (ruby-expr-beg 'expr-re))
          (if (ruby-forward-string "/" end t t)
              nil
            (setq in-string (point))
            (goto-char end)))
         (t
          (goto-char pnt))))
       ((looking-at "%")
        (cond
         ((and (not (eobp))
               (ruby-expr-beg 'expr-qstr)
               (not (looking-at "%="))
               (looking-at "%[QqrxWw]?\\([^a-zA-Z0-9 \t\n]\\)"))
          (goto-char (match-beginning 1))
          (setq expand (not (memq (char-before) '(?q ?w))))
          (setq w (match-string 1))
          (cond
           ((string= w "[") (setq re "]["))
           ((string= w "{") (setq re "}{"))
           ((string= w "(") (setq re ")("))
           ((string= w "<") (setq re "><"))
           ((and expand (string= w "\\"))
            (setq w (concat "\\" w))))
          (unless (cond (re (ruby-forward-string re end t expand))
                        (expand (ruby-forward-string w end t t))
                        (t (re-search-forward
                            (if (string= w "\\")
                                "\\\\[^\\]*\\\\"
                              (concat "[^\\]\\(\\\\\\\\\\)*" w))
                            end t)))
            (setq in-string (point))
            (goto-char end)))
         (t
          (goto-char pnt))))
       ((looking-at "\\?")              ;skip ?char
        (cond
         ((and (ruby-expr-beg)
               (looking-at "?\\(\\\\C-\\|\\\\M-\\)*\\\\?."))
          (goto-char (match-end 0)))
         (t
          (goto-char pnt))))
       ((looking-at "\\$")              ;skip $char
        (goto-char pnt)
        (forward-char 1))
       ((looking-at "#")                ;skip comment
        (forward-line 1)
        (goto-char (point))
        )
       ((looking-at "[\\[{(]")
        (let ((deep (ruby-deep-indent-paren-p (char-after))))
          (if (and deep (or (not (eq (char-after) ?\{)) (ruby-expr-beg)))
              (progn
                (and (eq deep 'space) (looking-at ".\\s +[^# \t\n]")
                     (setq pnt (1- (match-end 0))))
                (setq nest (cons (cons (char-after (point)) pnt) nest))
                (setq pcol (cons (cons pnt depth) pcol))
                (setq depth 0))
            (setq nest (cons (cons (char-after (point)) pnt) nest))
            (setq depth (1+ depth))))
        (goto-char pnt)
        )
       ((looking-at "[])}]")
        (if (ruby-deep-indent-paren-p (matching-paren (char-after)))
            (setq depth (cdr (car pcol)) pcol (cdr pcol))
          (setq depth (1- depth)))
        (setq nest (cdr nest))
        (goto-char pnt))
       ((looking-at ruby-block-end-re)
        (if (or (and (not (bolp))
                     (progn
                       (forward-char -1)
                       (setq w (char-after (point)))
                       (or (eq ?_ w)
                           (eq ?. w))))
                (progn
                  (goto-char pnt)
                  (setq w (char-after (point)))
                  (or (eq ?_ w)
                      (eq ?! w)
                      (eq ?? w))))
            nil
          (setq nest (cdr nest))
          (setq depth (1- depth)))
        (goto-char pnt))
       ((looking-at "def\\s +[^(\n;]*")
        (if (or (bolp)
                (progn
                  (forward-char -1)
                  (not (eq ?_ (char-after (point))))))
            (progn
              (setq nest (cons (cons nil pnt) nest))
              (setq depth (1+ depth))))
        (goto-char (match-end 0)))
863
       ((looking-at (concat "\\_<\\(" ruby-block-beg-re "\\)\\_>"))
Chong Yidong's avatar
Chong Yidong committed
864 865
        (and
         (save-match-data
866
           (or (not (looking-at "do\\_>"))
Chong Yidong's avatar
Chong Yidong committed
867 868 869 870 871 872 873 874 875 876
               (save-excursion
                 (back-to-indentation)
                 (not (looking-at ruby-non-block-do-re)))))
         (or (bolp)
             (progn
               (forward-char -1)
               (setq w (char-after (point)))
               (not (or (eq ?_ w)
                        (eq ?. w)))))
         (goto-char pnt)
877
         (not (eq ?! (char-after (point))))
Chong Yidong's avatar
Chong Yidong committed
878 879 880 881 882 883 884 885 886 887
         (skip-chars-forward " \t")
         (goto-char (match-beginning 0))
         (or (not (looking-at ruby-modifier-re))
             (ruby-expr-beg 'modifier))
         (goto-char pnt)
         (setq nest (cons (cons nil pnt) nest))
         (setq depth (1+ depth)))
        (goto-char pnt))
       ((looking-at ":\\(['\"]\\)")
        (goto-char (match-beginning 1))
888
        (ruby-forward-string (match-string 1) end t))
889
       ((looking-at ":\\([-,.+*/%&|^~<>]=?\\|===?\\|<=>\\|![~=]?\\)")
Chong Yidong's avatar
Chong Yidong committed
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
        (goto-char (match-end 0)))
       ((looking-at ":\\([a-zA-Z_][a-zA-Z_0-9]*[!?=]?\\)?")
        (goto-char (match-end 0)))
       ((or (looking-at "\\.\\.\\.?")
            (looking-at "\\.[0-9]+")
            (looking-at "\\.[a-zA-Z_0-9]+")
            (looking-at "\\."))
        (goto-char (match-end 0)))
       ((looking-at "^=begin")
        (if (re-search-forward "^=end" end t)
            (forward-line 1)
          (setq in-string (match-end 0))
          (goto-char end)))
       ((looking-at "<<")
        (cond
         ((and (ruby-expr-beg 'heredoc)
               (looking-at "<<\\(-\\)?\\(\\([\"'`]\\)\\([^\n]+?\\)\\3\\|\\(?:\\sw\\|\\s_\\)+\\)"))
          (setq re (regexp-quote (or (match-string 4) (match-string 2))))
          (if (match-beginning 1) (setq re (concat "\\s *" re)))
          (let* ((id-end (goto-char (match-end 0)))
910
                 (line-end-position (point-at-eol))
Chong Yidong's avatar
Chong Yidong committed
911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
                 (state (list in-string nest depth pcol indent)))
            ;; parse the rest of the line
            (while (and (> line-end-position (point))
                        (setq state (apply 'ruby-parse-partial
                                           line-end-position state))))
            (setq in-string (car state)
                  nest (nth 1 state)
                  depth (nth 2 state)
                  pcol (nth 3 state)
                  indent (nth 4 state))
            ;; skip heredoc section
            (if (re-search-forward (concat "^" re "$") end 'move)
                (forward-line 1)
              (setq in-string id-end)
              (goto-char end))))
         (t
          (goto-char pnt))))
       ((looking-at "^__END__$")
        (goto-char pnt))
       ((and (looking-at ruby-here-doc-beg-re)
	     (boundp 'ruby-indent-point))
        (if (re-search-forward (ruby-here-doc-end-match)
                               ruby-indent-point t)
            (forward-line 1)
          (setq in-string (match-end 0))
          (goto-char ruby-indent-point)))
       (t
        (error (format "bad string %s"
                       (buffer-substring (point) pnt)
                       ))))))
  (list in-string nest depth pcol))

(defun ruby-parse-region (start end)
  "TODO: document."
  (let (state)
    (save-excursion
      (if start
          (goto-char start)
        (ruby-beginning-of-indent))
      (save-restriction
        (narrow-to-region (point) end)
        (while (and (> end (point))
                    (setq state (apply 'ruby-parse-partial end state))))))
    (list (nth 0 state)                 ; in-string
          (car (nth 1 state))           ; nest
          (nth 2 state)                 ; depth
          (car (car (nth 3 state)))     ; pcol
          ;(car (nth 5 state))          ; indent
          )))

(defun ruby-indent-size (pos nest)
962
  "Return the indentation level in spaces NEST levels deeper than POS."
Chong Yidong's avatar
Chong Yidong committed
963 964 965
  (+ pos (* (or nest 1) ruby-indent-level)))

(defun ruby-calculate-indent (&optional parse-start)
966
  "Return the proper indentation level of the current line."
Chong Yidong's avatar
Chong Yidong committed
967 968 969 970 971
  ;; TODO: Document body
  (save-excursion
    (beginning-of-line)
    (let ((ruby-indent-point (point))
          (case-fold-search nil)
972
          state eol begin op-end
Chong Yidong's avatar
Chong Yidong committed
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
          (paren (progn (skip-syntax-forward " ")
                        (and (char-after) (matching-paren (char-after)))))
          (indent 0))
      (if parse-start
          (goto-char parse-start)
        (ruby-beginning-of-indent)
        (setq parse-start (point)))
      (back-to-indentation)
      (setq indent (current-column))
      (setq state (ruby-parse-region parse-start ruby-indent-point))
      (cond
       ((nth 0 state)                   ; within string
        (setq indent nil))              ;  do nothing
       ((car (nth 1 state))             ; in paren
        (goto-char (setq begin (cdr (nth 1 state))))
        (let ((deep (ruby-deep-indent-paren-p (car (nth 1 state)))))
          (if deep
              (cond ((and (eq deep t) (eq (car (nth 1 state)) paren))
                     (skip-syntax-backward " ")
                     (setq indent (1- (current-column))))
                    ((let ((s (ruby-parse-region (point) ruby-indent-point)))
                       (and (nth 2 s) (> (nth 2 s) 0)
                            (or (goto-char (cdr (nth 1 s))) t)))
                     (forward-word -1)
                     (setq indent (ruby-indent-size (current-column)
						    (nth 2 state))))
                    (t
                     (setq indent (current-column))
                     (cond ((eq deep 'space))
                           (paren (setq indent (1- indent)))
                           (t (setq indent (ruby-indent-size (1- indent) 1))))))
            (if (nth 3 state) (goto-char (nth 3 state))
              (goto-char parse-start) (back-to-indentation))
            (setq indent (ruby-indent-size (current-column) (nth 2 state))))
          (and (eq (car (nth 1 state)) paren)
               (ruby-deep-indent-paren-p (matching-paren paren))
               (search-backward (char-to-string paren))
               (setq indent (current-column)))))
       ((and (nth 2 state) (> (nth 2 state) 0)) ; in nest
        (if (null (cdr (nth 1 state)))
            (error "invalid nest"))
        (goto-char (cdr (nth 1 state)))
        (forward-word -1)               ; skip back a keyword
        (setq begin (point))
        (cond
         ((looking-at "do\\>[^_]")      ; iter block is a special case
          (if (nth 3 state) (goto-char (nth 3 state))
            (goto-char parse-start) (back-to-indentation))
          (setq indent (ruby-indent-size (current-column) (nth 2 state))))
         (t
          (setq indent (+ (current-column) ruby-indent-level)))))
1024

Chong Yidong's avatar
Chong Yidong committed
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
       ((and (nth 2 state) (< (nth 2 state) 0)) ; in negative nest
        (setq indent (ruby-indent-size (current-column) (nth 2 state)))))
      (when indent
        (goto-char ruby-indent-point)
        (end-of-line)
        (setq eol (point))
        (beginning-of-line)
        (cond
         ((and (not (ruby-deep-indent-paren-p paren))
               (re-search-forward ruby-negative eol t))
          (and (not (eq ?_ (char-after (match-end 0))))
               (setq indent (- indent ruby-indent-level))))
         ((and
           (save-excursion
             (beginning-of-line)
             (not (bobp)))
           (or (ruby-deep-indent-paren-p t)
               (null (car (nth 1 state)))))
          ;; goto beginning of non-empty no-comment line
          (let (end done)
            (while (not done)
              (skip-chars-backward " \t\n")
              (setq end (point))
              (beginning-of-line)
              (if (re-search-forward "^\\s *#" end t)
                  (beginning-of-line)
                (setq done t))))
          (end-of-line)
          ;; skip the comment at the end
          (skip-chars-backward " \t")
          (let (end (pos (point)))
            (beginning-of-line)
            (while (and (re-search-forward "#" pos t)
                        (setq end (1- (point)))
                        (or (ruby-special-char-p end)
                            (and (setq state (ruby-parse-region parse-start end))
                                 (nth 0 state))))
              (setq end nil))
            (goto-char (or end pos))
            (skip-chars-backward " \t")
            (setq begin (if (and end (nth 0 state)) pos (cdr (nth 1 state))))
            (setq state (ruby-parse-region parse-start (point))))
          (or (bobp) (forward-char -1))
          (and
           (or (and (looking-at ruby-symbol-re)
                    (skip-chars-backward ruby-symbol-chars)
                    (looking-at (concat "\\<\\(" ruby-block-hanging-re "\\)\\>"))
                    (not (eq (point) (nth 3 state)))
                    (save-excursion
                      (goto-char (match-end 0))
                      (not (looking-at "[a-z_]"))))
               (and (looking-at ruby-operator-re)
                    (not (ruby-special-char-p))
1078 1079 1080 1081
                    (save-excursion
                      (forward-char -1)
                      (or (not (looking-at ruby-operator-re))
                          (not (eq (char-before) ?:))))
1082
                    ;; Operator at the end of line.
Chong Yidong's avatar
Chong Yidong committed
1083 1084 1085 1086 1087 1088 1089 1090 1091
                    (let ((c (char-after (point))))
                      (and
;;                     (or (null begin)
;;                         (save-excursion
;;                           (goto-char begin)
;;                           (skip-chars-forward " \t")
;;                           (not (or (eolp) (looking-at "#")
;;                                    (and (eq (car (nth 1 state)) ?{)
;;                                         (looking-at "|"))))))
1092
                       ;; Not a regexp or percent literal.
1093 1094
                       (null (nth 0 (ruby-parse-region (or begin parse-start)
                                                       (point))))
Chong Yidong's avatar
Chong Yidong committed
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
                       (or (not (eq ?| (char-after (point))))
                           (save-excursion
                             (or (eolp) (forward-char -1))
                             (cond
                              ((search-backward "|" nil t)
                               (skip-chars-backward " \t\n")
                               (and (not (eolp))
                                    (progn
                                      (forward-char -1)
                                      (not (looking-at "{")))
                                    (progn
                                      (forward-word -1)
                                      (not (looking-at "do\\>[^_]")))))
                              (t t))))
                       (not (eq ?, c))
                       (setq op-end t)))))
           (setq indent
                 (cond
                  ((and
                    (null op-end)
                    (not (looking-at (concat "\\<\\(" ruby-block-hanging-re "\\)\\>")))
                    (eq (ruby-deep-indent-paren-p t) 'space)
                    (not (bobp)))
                   (widen)
                   (goto-char (or begin parse-start))
                   (skip-syntax-forward " ")
                   (current-column))
                  ((car (nth 1 state)) indent)
                  (t
                   (+ indent ruby-indent-level))))))))
      (goto-char ruby-indent-point)
      (beginning-of-line)
      (skip-syntax-forward " ")
      (if (looking-at "\\.[^.]")
          (+ indent ruby-indent-level)
        indent))))

(defun ruby-beginning-of-defun (&optional arg)
1133
  "Move backward to the beginning of the current defun.
1134
With ARG, move backward multiple defuns.  Negative ARG means
Chong Yidong's avatar
Chong Yidong committed
1135 1136
move forward."
  (interactive "p")
1137 1138 1139 1140 1141 1142 1143 1144 1145
  (let (case-fold-search)
    (and (re-search-backward (concat "^\\s *" ruby-defun-beg-re "\\_>")
                             nil t (or arg 1))
         (beginning-of-line))))

(defun ruby-end-of-defun ()
  "Move point to the end of the current defun.
The defun begins at or after the point.  This function is called
by `end-of-defun'."
Chong Yidong's avatar
Chong Yidong committed
1146
  (interactive "p")
Dmitry Gutov's avatar
Dmitry Gutov committed
1147
  (ruby-forward-sexp)
1148 1149 1150
  (let (case-fold-search)
    (when (looking-back (concat "^\\s *" ruby-block-end-re))
      (forward-line 1))))
Chong Yidong's avatar
Chong Yidong committed
1151 1152

(defun ruby-beginning-of-indent ()
1153 1154 1155 1156 1157 1158 1159
  "Backtrack to a line which can be used as a reference for
calculating indentation on the lines after it."
  (while (and (re-search-backward ruby-indent-beg-re nil 'move)
              (if (ruby-in-ppss-context-p 'anything)
                  t
                ;; We can stop, then.
                (beginning-of-line)))))
Chong Yidong's avatar
Chong Yidong committed
1160 1161

(defun ruby-move-to-block (n)
1162 1163
  "Move to the beginning (N < 0) or the end (N > 0) of the
current block, a sibling block, or an outer block.  Do that (abs N) times."
1164
  (back-to-indentation)
1165
  (let ((signum (if (> n 0) 1 -1))
1166
        (backward (< n 0))
1167
        (depth (or (nth 2 (ruby-parse-region (point) (line-end-position))) 0))
1168
        case-fold-search
1169
        down done)
1170 1171
    (when (looking-at ruby-block-mid-re)
      (setq depth (+ depth signum)))
1172 1173 1174
    (when (< (* depth signum) 0)
      ;; Moving end -> end or beginning -> beginning.
      (setq depth 0))
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
    (dotimes (_ (abs n))
      (setq done nil)
      (setq down (save-excursion
                   (back-to-indentation)
                   ;; There is a block start or block end keyword on this
                   ;; line, don't need to look for another block.
                   (and (re-search-forward
                         (if backward ruby-block-end-re
                           (concat "\\_<\\(" ruby-block-beg-re "\\)\\_>"))
                         (line-end-position) t)
                        (not (nth 8 (syntax-ppss))))))
      (while (and (not done) (not (if backward (bobp) (eobp))))
        (forward-line signum)
Chong Yidong's avatar
Chong Yidong committed
1188
        (cond
1189 1190 1191 1192 1193 1194 1195 1196
         ;; Skip empty and commented out lines.
         ((looking-at "^\\s *$"))
         ((looking-at "^\\s *#"))
         ;; Skip block comments;
         ((and (not backward) (looking-at "^=begin\\>"))
          (re-search-forward "^=end\\>"))
         ((and backward (looking-at "^=end\\>"))
          (re-search-backward "^=begin\\>"))
1197 1198 1199 1200 1201 1202
         ;; Jump over a multiline literal.
         ((ruby-in-ppss-context-p 'string)
          (goto-char (nth 8 (syntax-ppss)))
          (unless backward
            (forward-sexp)
            (when (bolp) (forward-char -1)))) ; After a heredoc.
1203
         (t
1204 1205 1206
          (let ((state (ruby-parse-region (point) (line-end-position))))
            (unless (car state) ; Line ends with unfinished string.
              (setq depth (+ (nth 2 state) depth))))
1207
          (cond
1208
           ;; Increased depth, we found a block.
1209
           ((> (* signum depth) 0)
1210
            (setq down t))
1211 1212
           ;; We're at the same depth as when we started, and we've
           ;; encountered a block before.  Stop.
1213
           ((and down (zerop depth))
1214
            (setq done t))
1215
           ;; Lower depth, means outer block, can stop now.
1216
           ((< (* signum depth) 0)
1217
            (setq done t)))))))
1218
    (back-to-indentation)))
Chong Yidong's avatar
Chong Yidong committed
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228

(defun ruby-beginning-of-block (&optional arg)
  "Move backward to the beginning of the current block.
With ARG, move up multiple blocks."
  (interactive "p")
  (ruby-move-to-block (- (or arg 1))))

(defun ruby-end-of-block (&optional arg)
  "Move forward to the end of the current block.
With ARG, move out of multiple blocks."
1229
  (interactive "p")
Chong Yidong's avatar
Chong Yidong committed
1230 1231 1232 1233
  (ruby-move-to-block (or arg 1)))

(defun ruby-forward-sexp (&optional arg)
  "Move forward across one balanced expression (sexp).
1234
With ARG, do it many times.  Negative ARG means move backward."
Chong Yidong's avatar
Chong Yidong committed
1235 1236
  ;; TODO: Document body
  (interactive "p")
1237 1238 1239 1240
  (cond
   (ruby-use-smie (forward-sexp arg))
   ((and (numberp arg) (< arg 0)) (ruby-backward-sexp (- arg)))
   (t
Chong Yidong's avatar
Chong Yidong committed
1241 1242 1243 1244
    (let ((i (or arg 1)))
      (condition-case nil
          (while (> i 0)
            (skip-syntax-forward " ")
1245
	    (if (looking-at ",\\s *") (goto-char (match-end 0)))
Chong Yidong's avatar
Chong Yidong committed
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
            (cond ((looking-at "\\?\\(\\\\[CM]-\\)*\\\\?\\S ")
                   (goto-char (match-end 0)))
                  ((progn
                     (skip-chars-forward ",.:;|&^~=!?\\+\\-\\*")
                     (looking-at "\\s("))
                   (goto-char (scan-sexps (point) 1)))
                  ((and (looking-at (concat "\\<\\(" ruby-block-beg-re "\\)\\>"))
                        (not (eq (char-before (point)) ?.))
                        (not (eq (char-before (point)) ?:)))
                   (ruby-end-of-block)
                   (forward-word 1))
                  ((looking-at "\\(\\$\\|@@?\\)?\\sw")
                   (while (progn
                            (while (progn (forward-word 1) (looking-at "_")))
                            (cond ((looking-at "::") (forward-char 2) t)
                                  ((> (skip-chars-forward ".") 0))
                                  ((looking-at "\\?\\|!\\(=[~=>]\\|[^~=]\\)")
                                   (forward-char 1) nil)))))
                  ((let (state expr)
                     (while
                         (progn
                           (setq expr (or expr (ruby-expr-beg)
                                          (looking-at "%\\sw?\\Sw\\|[\"'`/]")))
                           <