ruby-mode.el 80.1 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
(define-abbrev-table 'ruby-mode-abbrev-table ()
145
  "Abbrev table in use in Ruby mode buffers.")
Chong Yidong's avatar
Chong Yidong committed
146

147
(defvar ruby-use-smie t)
148

Chong Yidong's avatar
Chong Yidong committed
149 150
(defvar ruby-mode-map
  (let ((map (make-sparse-keymap)))
151 152 153 154
    (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))
Chong Yidong's avatar
Chong Yidong committed
155 156
    (define-key map (kbd "M-C-p") 'ruby-beginning-of-block)
    (define-key map (kbd "M-C-n") 'ruby-end-of-block)
157
    (define-key map (kbd "C-c {") 'ruby-toggle-block)
Chong Yidong's avatar
Chong Yidong committed
158
    map)
159
  "Keymap used in Ruby mode.")
Chong Yidong's avatar
Chong Yidong committed
160 161 162 163 164 165 166 167 168 169 170 171

(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)
172
    (modify-syntax-entry ?: "_" table)
Chong Yidong's avatar
Chong Yidong committed
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
    (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)
191
  "Syntax table to use in Ruby mode.")
Chong Yidong's avatar
Chong Yidong committed
192 193

(defcustom ruby-indent-tabs-mode nil
194
  "Indentation can insert tabs in Ruby mode if this is non-nil."
Chong Yidong's avatar
Chong Yidong committed
195 196 197
  :type 'boolean :group 'ruby)

(defcustom ruby-indent-level 2
198
  "Indentation of Ruby statements."
Chong Yidong's avatar
Chong Yidong committed
199 200
  :type 'integer :group 'ruby)

201
(defcustom ruby-comment-column (default-value 'comment-column)
Chong Yidong's avatar
Chong Yidong committed
202 203 204 205 206 207 208 209 210
  "Indentation column of comments."
  :type 'integer :group 'ruby)

(defcustom ruby-deep-arglist t
  "Deep indent lists in parenthesis when non-nil.
Also ignores spaces after parenthesis when 'space."
  :group 'ruby)

(defcustom ruby-deep-indent-paren '(?\( ?\[ ?\] t)
211 212
  "Deep indent lists in parenthesis when non-nil.
The value t means continuous line.
Chong Yidong's avatar
Chong Yidong committed
213 214 215 216 217 218 219 220 221 222 223 224
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)

(defcustom ruby-encoding-map '((shift_jis . cp932) (shift-jis . cp932))
  "Alist to map encoding name from Emacs to Ruby."
  :group 'ruby)

(defcustom ruby-insert-encoding-magic-comment t
225
  "Insert a magic Emacs 'coding' comment upon save if this is non-nil."
Chong Yidong's avatar
Chong Yidong committed
226 227 228 229 230 231 232 233 234 235 236 237
  :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)

;; Safe file variables
(put 'ruby-indent-tabs-mode 'safe-local-variable 'booleanp)
(put 'ruby-indent-level 'safe-local-variable 'integerp)
(put 'ruby-comment-column 'safe-local-variable 'integerp)
(put 'ruby-deep-arglist 'safe-local-variable 'booleanp)

238 239 240 241 242 243 244 245 246 247 248
;;; SMIE support

(require 'smie)

(defconst ruby-smie-grammar
  ;; FIXME: Add support for Cucumber.
  (smie-prec2->grammar
   (smie-bnf->prec2
    '((id)
      (insts (inst) (insts ";" insts))
      (inst (exp) (inst "iuwu-mod" exp))
249 250
      (exp  (exp1) (exp "," exp) (exp "=" exp) (exp "-" exp)  (exp "+" exp)
            (id " @ " exp))
251 252 253 254 255 256 257 258
      (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 "}")
259
            ("{" insts "}")
260 261 262 263 264
            ("while" insts "end")
            ("until" insts "end")
            ("unless" insts "end")
            ("if" if-body "end")
            ("case"  cases "end"))
265
      (formal-params ("opening-|" exp "|"))
266 267 268
      (for-body (for-head ";" insts))
      (for-head (id "in" exp))
      (cases (exp "then" insts) ;; FIXME: Ruby also allows (exp ":" insts).
269
             (cases "when" cases) (insts "else" insts))
270 271 272 273 274 275 276 277
      (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)))
278 279
    '((nonassoc "in") (assoc ";") (right " @ ")
      (assoc ",") (right "=") (assoc "-" "+"))
280 281 282 283 284 285 286 287 288 289 290 291 292
    '((assoc "when"))
    '((assoc "elsif"))
    '((assoc "rescue" "ensure"))
    '((assoc ",")))))

(defun ruby-smie--bosp ()
  (save-excursion (skip-chars-backward " \t")
                  (or (bolp) (eq (char-before) ?\;))))

(defun ruby-smie--implicit-semi-p ()
  (save-excursion
    (skip-chars-backward " \t")
    (not (or (bolp)
293 294
             (and (memq (char-before)
                        '(?\; ?- ?+ ?* ?/ ?: ?. ?, ?\[ ?\( ?\{ ?\\))
295 296
                  ;; Make sure it's not the end of a regexp.
                  (not (eq (car (syntax-after (1- (point)))) 7)))
297 298 299 300 301
             (and (eq (char-before) ?\?)
                  (equal (save-excursion (ruby-smie--backward-token)) "?"))
             (and (eq (char-before) ?=)
                  (string-match "\\`\\s." (save-excursion
                                            (ruby-smie--backward-token))))
302 303 304
             (and (eq (car (syntax-after (1- (point)))) 2)
                  (equal (save-excursion (ruby-smie--backward-token))
                         "iuwu-mod"))
305 306 307
             (save-excursion
               (forward-comment 1)
               (eq (char-after) ?.))))))
308

309 310 311
(defun ruby-smie--redundant-do-p (&optional skip)
  (save-excursion
    (if skip (backward-word 1))
312
    (member (nth 2 (smie-backward-sexp ";")) '("while" "until" "for"))))
313

314 315 316 317 318 319
(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)))))
320

321 322 323 324 325 326
(defun ruby-smie--args-separator-p (pos)
  (and
   (eq ?w (char-syntax (char-before)))
   (< pos (point-max))
   (memq (char-syntax (char-after pos)) '(?w ?\"))))

327 328 329 330 331 332 333 334 335
(defun ruby-smie--forward-id ()
  (when (and (not (eobp))
             (eq ?w (char-syntax (char-after))))
    (let ((tok (smie-default-forward-token)))
      (when (eq ?. (char-after))
        (forward-char 1)
        (setq tok (concat tok "." (ruby-smie--forward-id))))
      tok)))

336
(defun ruby-smie--forward-token ()
337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355
  (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
        (let ((tok (smie-default-forward-token)))
356
          (cond
357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372
           ((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 ";")))
           ((equal tok ".") (concat tok (ruby-smie--forward-id)))
           (t tok)))))))))
373

374 375 376 377 378 379 380 381 382
(defun ruby-smie--backward-id ()
  (when (and (not (bobp))
             (eq ?w (char-syntax (char-before))))
    (let ((tok (smie-default-backward-token)))
      (when (eq ?. (char-before))
        (forward-char -1)
        (setq tok (concat (ruby-smie--backward-id) "." tok)))
      tok)))

383 384 385
(defun ruby-smie--backward-token ()
  (let ((pos (point)))
    (forward-comment (- (point)))
386 387 388 389
    (cond
     ((and (> pos (line-end-position)) (ruby-smie--implicit-semi-p))
      (skip-chars-forward " \t") ";")
     ((and (bolp) (not (bobp))) "")         ;Presumably a heredoc.
390 391 392 393 394 395
     ((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".
      " @ ")
396
     (t
397
      (let ((tok (smie-default-backward-token)))
398 399
        (when (eq ?. (char-before))
          (forward-char -1)
400
          (setq tok (concat "." tok)))
401 402
        (when (and (eq ?: (char-before)) (string-match "\\`\\s." tok))
          (forward-char -1) (setq tok (concat ":" tok))) ;; bug#15208.
403 404 405 406
        (cond
         ((member tok '("unless" "if" "while" "until"))
          (if (ruby-smie--bosp)
              tok "iuwu-mod"))
407 408
         ((equal tok "|")
          (if (ruby-smie--opening-pipe-p) "opening-|" tok))
409 410
         ((and (equal tok "") (eq ?\\ (char-before)) (looking-at "\n"))
          (forward-char -1) (ruby-smie--backward-token))
411 412 413 414 415 416 417 418
         ((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 ";")))
419 420 421
         ;; FIXME: We shouldn't merge the dot with preceding token here
         ;; either, but not doing that breaks indentation of hanging
         ;; method calls with dot on the first line.
422 423
         ((equal tok ".")
          (concat (ruby-smie--backward-id) tok))
424
         (t tok)))))))
425 426 427 428

(defun ruby-smie-rules (kind token)
  (pcase (cons kind token)
    (`(:elem . basic) ruby-indent-level)
429 430 431 432
    ;; "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))
433 434
    (`(:after . ";")
     (if (smie-rule-parent-p "def" "begin" "do" "class" "module" "for"
435
                             "while" "until" "unless"
436 437 438 439 440 441
                             "if" "then" "elsif" "else" "when"
                             "rescue" "ensure")
         (smie-rule-parent ruby-indent-level)
       ;; For (invalid) code between switch and case.
       ;; (if (smie-parent-p "switch") 4)
       0))
442 443 444
    (`(:before . ,(or `"(" `"[" `"{"))
     ;; Treat purely syntactic block-constructs as being part of their parent,
     ;; when the opening statement is hanging.
445 446
     (when (smie-rule-hanging-p)
       (smie-backward-sexp 'halfsexp) (smie-indent-virtual)))
447
    (`(:after . ,(or "=" "iuwu-mod")) 2)
448
    (`(:before . "do") (smie-rule-parent))
449
    (`(:before . ,(or `"else" `"then" `"elsif" `"rescue" `"ensure")) 0)
450 451
    (`(:before . ,(or `"when"))
     (if (not (smie-rule-sibling-p)) 0)) ;; ruby-indent-level
452
    ))
453

Chong Yidong's avatar
Chong Yidong committed
454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503
(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 ()
504
  "Set up initial buffer-local variables for Ruby mode."
Chong Yidong's avatar
Chong Yidong committed
505 506 507
  (set-syntax-table ruby-mode-syntax-table)
  (setq local-abbrev-table ruby-mode-abbrev-table)
  (setq indent-tabs-mode ruby-indent-tabs-mode)
508 509 510 511 512
  (if ruby-use-smie
      (smie-setup ruby-smie-grammar #'ruby-smie-rules
                  :forward-token  #'ruby-smie--forward-token
                  :backward-token #'ruby-smie--backward-token)
    (set (make-local-variable 'indent-line-function) 'ruby-indent-line))
Chong Yidong's avatar
Chong Yidong committed
513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531
  (set (make-local-variable 'require-final-newline) t)
  (set (make-local-variable 'comment-start) "# ")
  (set (make-local-variable 'comment-end) "")
  (set (make-local-variable 'comment-column) ruby-comment-column)
  (set (make-local-variable 'comment-start-skip) "#+ *")
  (set (make-local-variable 'parse-sexp-ignore-comments) t)
  (set (make-local-variable 'parse-sexp-lookup-properties) t)
  (set (make-local-variable 'paragraph-start) (concat "$\\|" page-delimiter))
  (set (make-local-variable 'paragraph-separate) paragraph-start)
  (set (make-local-variable 'paragraph-ignore-fill-prefix) t))

(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
532
             (or save-buffer-coding-system
533 534 535 536 537
                 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
538
        (setq coding-system
539 540 541 542 543 544
              (if coding-system
                  (symbol-name
                   (or (and ruby-use-encoding-map
                            (cdr (assq coding-system ruby-encoding-map)))
                       coding-system))
                "ascii-8bit"))
545
        (if (looking-at "^#!") (beginning-of-line 2))
Chong Yidong's avatar
Chong Yidong committed
546 547 548 549 550 551 552 553 554 555 556 557
        (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
558 559 560
                   (insert "# -*- coding: " coding-system " -*-\n"))))
        (when (buffer-modified-p)
          (basic-save-buffer-1))))))
Chong Yidong's avatar
Chong Yidong committed
561 562 563 564 565 566 567 568

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

569
(defun ruby-indent-line (&optional ignored)
570
  "Correct the indentation of the current Ruby line."
Chong Yidong's avatar
Chong Yidong committed
571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607
  (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 ??)))))

608 609 610 611 612
(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)) ?_)))
613
         (looking-at ruby-singleton-class-re))))
614

Chong Yidong's avatar
Chong Yidong committed
615
(defun ruby-expr-beg (&optional option)
616 617 618
  "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
619 620
  (save-excursion
    (store-match-data nil)
621 622
    (let ((space (skip-chars-backward " \t"))
          (start (point)))
Chong Yidong's avatar
Chong Yidong committed
623 624 625 626 627 628 629 630
      (cond
       ((bolp) t)
       ((progn
          (forward-char -1)
          (and (looking-at "\\?")
               (or (eq (char-syntax (char-before (point))) ?w)
                   (ruby-special-char-p))))
        nil)
631 632 633 634
       ((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
635 636 637 638 639 640 641 642 643 644 645 646 647
            (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))
648
                   (not (looking-at "\\s_\\|!")))
Chong Yidong's avatar
Chong Yidong committed
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671
                  ((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)
672
  "TODO: document."
Chong Yidong's avatar
Chong Yidong committed
673 674 675 676 677 678 679 680 681 682
  (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)
683
  "TODO: document throughout function body."
Chong Yidong's avatar
Chong Yidong committed
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804
  (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)))
805
       ((looking-at (concat "\\_<\\(" ruby-block-beg-re "\\)\\_>"))
Chong Yidong's avatar
Chong Yidong committed
806 807
        (and
         (save-match-data
808
           (or (not (looking-at "do\\_>"))
Chong Yidong's avatar
Chong Yidong committed
809 810 811 812 813 814 815 816 817 818
               (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)
819
         (not (eq ?! (char-after (point))))
Chong Yidong's avatar
Chong Yidong committed
820 821 822 823 824 825 826 827 828 829
         (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))
830
        (ruby-forward-string (match-string 1) end t))
831
       ((looking-at ":\\([-,.+*/%&|^~<>]=?\\|===?\\|<=>\\|![~=]?\\)")
Chong Yidong's avatar
Chong Yidong committed
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851
        (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)))
852
                 (line-end-position (point-at-eol))
Chong Yidong's avatar
Chong Yidong committed
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
                 (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)
904
  "Return the indentation level in spaces NEST levels deeper than POS."
Chong Yidong's avatar
Chong Yidong committed
905 906 907
  (+ pos (* (or nest 1) ruby-indent-level)))

(defun ruby-calculate-indent (&optional parse-start)
908
  "Return the proper indentation level of the current line."
Chong Yidong's avatar
Chong Yidong committed
909 910 911 912 913
  ;; TODO: Document body
  (save-excursion
    (beginning-of-line)
    (let ((ruby-indent-point (point))
          (case-fold-search nil)
914
          state eol begin op-end
Chong Yidong's avatar
Chong Yidong committed
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
          (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)))))
966

Chong Yidong's avatar
Chong Yidong committed
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
       ((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))
1020 1021 1022 1023
                    (save-excursion
                      (forward-char -1)
                      (or (not (looking-at ruby-operator-re))
                          (not (eq (char-before) ?:))))
1024
                    ;; Operator at the end of line.
Chong Yidong's avatar
Chong Yidong committed
1025 1026 1027 1028 1029 1030 1031 1032 1033
                    (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 "|"))))))
1034
                       ;; Not a regexp or percent literal.
1035 1036
                       (null (nth 0 (ruby-parse-region (or begin parse-start)
                                                       (point))))
Chong Yidong's avatar
Chong Yidong committed
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
                       (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)
1075
  "Move backward to the beginning of the current defun.
1076
With ARG, move backward multiple defuns.  Negative ARG means
Chong Yidong's avatar
Chong Yidong committed
1077 1078
move forward."
  (interactive "p")
1079 1080 1081 1082 1083 1084 1085 1086 1087
  (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
1088
  (interactive "p")
Dmitry Gutov's avatar
Dmitry Gutov committed
1089
  (ruby-forward-sexp)
1090 1091 1092
  (let (case-fold-search)
    (when (looking-back (concat "^\\s *" ruby-block-end-re))
      (forward-line 1))))
Chong Yidong's avatar
Chong Yidong committed
1093 1094

(defun ruby-beginning-of-indent ()
1095 1096 1097 1098 1099 1100 1101
  "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
1102 1103

(defun ruby-move-to-block (n)
1104 1105
  "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."
1106
  (back-to-indentation)
1107
  (let ((signum (if (> n 0) 1 -1))
1108
        (backward (< n 0))
1109
        (depth (or (nth 2 (ruby-parse-region (point) (line-end-position))) 0))
1110
        case-fold-search
1111
        down done)
1112 1113
    (when (looking-at ruby-block-mid-re)
      (setq depth (+ depth signum)))
1114 1115 1116
    (when (< (* depth signum) 0)
      ;; Moving end -> end or beginning -> beginning.
      (setq depth 0))
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
    (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
1130
        (cond
1131 1132 1133 1134 1135 1136 1137 1138
         ;; 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\\>"))
1139 1140 1141 1142 1143 1144
         ;; 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.
1145
         (t
1146 1147 1148
          (let ((state (ruby-parse-region (point) (line-end-position))))
            (unless (car state) ; Line ends with unfinished string.
              (setq depth (+ (nth 2 state) depth))))
1149
          (cond
1150
           ;; Increased depth, we found a block.
1151
           ((> (* signum depth) 0)
1152
            (setq down t))
1153 1154
           ;; We're at the same depth as when we started, and we've
           ;; encountered a block before.  Stop.
1155
           ((and down (zerop depth))
1156
            (setq done t))
1157
           ;; Lower depth, means outer block, can stop now.
1158
           ((< (* signum depth) 0)
1159
            (setq done t)))))))
1160
    (back-to-indentation)))
Chong Yidong's avatar
Chong Yidong committed
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170

(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."
1171
  (interactive "p")
Chong Yidong's avatar
Chong Yidong committed
1172 1173 1174 1175
  (ruby-move-to-block (or arg 1)))

(defun ruby-forward-sexp (&optional arg)
  "Move forward across one balanced expression (sexp).
1176
With ARG, do it many times.  Negative ARG means move backward."
Chong Yidong's avatar
Chong Yidong committed
1177 1178
  ;; TODO: Document body
  (interactive "p")
1179 1180 1181 1182
  (cond
   (ruby-use-smie (forward-sexp arg))
   ((and (numberp arg) (< arg 0)) (ruby-backward-sexp (- arg)))
   (t
Chong Yidong's avatar
Chong Yidong committed
1183 1184 1185 1186
    (let ((i (or arg 1)))
      (condition-case nil
          (while (> i 0)
            (skip-syntax-forward " ")
1187
	    (if (looking-at ",\\s *") (goto-char (match-end 0)))
Chong Yidong's avatar
Chong Yidong committed
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
            (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\\|[\"'`/]")))
                           (nth 1 (setq state (apply 'ruby-parse-partial nil state))))
                       (setq expr t)
                       (skip-chars-forward "<"))
                     (not expr))))
            (setq i (1- i)))
        ((error) (forward-word 1)))
1217
      i))))
Chong Yidong's avatar
Chong Yidong committed
1218 1219 1220

(defun ruby-backward-sexp (&optional arg)
  "Move backward across one balanced expression (sexp).
1221
With ARG, do it many times.  Negative ARG means move forward."
Chong Yidong's avatar
Chong Yidong committed
1222 1223
  ;; TODO: Document body
  (interactive "p")
1224 1225 1226 1227
  (cond
   (ruby-use-smie (backward-sexp arg))
   ((and (numberp arg) (< arg 0)) (ruby-forward-sexp (- arg)))
   (t
Chong Yidong's avatar
Chong Yidong committed
1228 1229 1230 1231 1232 1233 1234 1235 1236
    (let ((i (or arg 1)))
      (condition-case nil
          (while (> i 0)
            (skip-chars-backward " \t\n,.:;|&^~=!?\\+\\-\\*")
            (forward-char -1)
            (cond ((looking-at "\\s)")
                   (goto-char (scan-sexps (1+ (point)) -1))
                   (case (char-before)
                     (?% (forward-char -1))
1237
                     ((?q ?Q ?w ?W ?r ?x)
Chong Yidong's avatar
Chong Yidong committed
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
                      (if (eq (char-before (1- (point))) ?%) (forward-char -2))))
                   nil)
                  ((looking-at "\\s\"\\|\\\\\\S_")
                   (let ((c (char-to-string (char-before (match-end 0)))))
                     (while (and (search-backward c)
				 (eq (logand (skip-chars-backward "\\") 1)
				     1))))
                   nil)
                  ((looking-at "\\s.\\|\\s\\")
                   (if (ruby-special-char-p) (forward-char -1)))
                  ((looking-at "\\s(") nil)
                  (t
                   (forward-char 1)
                   (while (progn (forward-word -1)
                                 (case (char-before)
                                   (?_ t)
                                   (?. (forward-char -1) t)
                                   ((?$ ?@)
                                    (forward-char -1)
                                    (and (eq (char-before) (char-after)) (forward-char -1)))
                                   (?:
                                    (forward-char -1)
                                    (eq (char-before) :)))))
                   (if (looking-at ruby-block-end-re)
                       (ruby-beginning-of-block))
                   nil))
            (setq i (1- i)))
        ((error)))
1266
      i))))
Chong Yidong's avatar
Chong Yidong committed
1267

1268 1269
(defun ruby-indent-exp (&optional ignored)
  "Indent each line in the balanced expression following the point."
Chong Yidong's avatar
Chong Yidong committed
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
  (interactive "*P")
  (let ((here (point-marker)) start top column (nest t))
    (set-marker-insertion-type here t)
    (unwind-protect
        (progn
          (beginning-of-line)
          (setq start (point) top (current-indentation))
          (while (and (not (eobp))
                      (progn
                        (setq column (ruby-calculate-indent start))
                        (cond ((> column top)
                               (setq nest t))
                              ((and (= column top) nest)
                               (setq nest nil) t))))
            (ruby-indent-to column)
            (beginning-of-line 2)))
      (goto-char here)
      (set-marker here nil))))

(defun ruby-add-log-current-method ()
1290
  "Return the current method name as a string.
Chong Yidong's avatar
Chong Yidong committed
1291 1292 1293 1294 1295 1296 1297
This string includes all namespaces.

For example:

  #exit
  String#gsub
  Net::HTTP#active?
1298
  File.open
Chong Yidong's avatar
Chong Yidong committed
1299 1300 1301 1302

See `add-log-current-defun-function'."
  (condition-case nil
      (save-excursion
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
        (let*