ruby-mode.el 57.1 KB
Newer Older
Chong Yidong's avatar
Chong Yidong committed
1 2
;;; ruby-mode.el --- Major mode for editing Ruby files

3
;; Copyright (C) 1994-2012  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 10 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
;; URL: http://www.emacswiki.org/cgi-bin/wiki/RubyMode
;; Created: Fri Feb  4 14:49:13 JST 1994
;; Keywords: languages ruby
;; Version: 1.0

;; 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 58 59 60 61 62 63 64 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 95 96 97 98 99 100
(defconst ruby-keyword-end-re
  (if (string-match "\\_>" "ruby")
      "\\_>"
    "\\>"))

(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
  (concat (regexp-opt '("while" "until" "for" "rescue") t) ruby-keyword-end-re)
  "Regexp to match keywords that nest without blocks.")

(defconst ruby-indent-beg-re
  (concat "\\(\\s *" (regexp-opt '("class" "module" "def") t) "\\)\\|"
          (regexp-opt '("if" "unless" "case" "while" "until" "for" "begin")))
  "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.")

(defconst ruby-block-end-re "\\<end\\>")

101 102
(eval-and-compile
  (defconst ruby-here-doc-beg-re
Chong Yidong's avatar
Chong Yidong committed
103
  "\\(<\\)<\\(-\\)?\\(\\([a-zA-Z0-9_]+\\)\\|[\"]\\([^\"]+\\)[\"]\\|[']\\([^']+\\)[']\\)"
104
    "Regexp to match the beginning of a heredoc."))
Chong Yidong's avatar
Chong Yidong committed
105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135

(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
  (concat "[?$/%(){}#\"'`.:]\\|<<\\|\\[\\|\\]\\|\\<\\("
          ruby-block-beg-re
          "\\)\\>\\|" ruby-block-end-re
          "\\|^=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.")

(defconst ruby-operator-re "[-,.+*/%&|^~=<>:]"
  "Regexp to match operators.")

(defconst ruby-symbol-chars "a-zA-Z0-9_"
  "List of characters that symbol names may contain.")
(defconst ruby-symbol-re (concat "[" ruby-symbol-chars "]")
  "Regexp to match symbols.")

136
(define-abbrev-table 'ruby-mode-abbrev-table ()
137
  "Abbrev table in use in Ruby mode buffers.")
Chong Yidong's avatar
Chong Yidong committed
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153

(defvar ruby-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "{" 'ruby-electric-brace)
    (define-key map "}" 'ruby-electric-brace)
    (define-key map (kbd "M-C-a") 'ruby-beginning-of-defun)
    (define-key map (kbd "M-C-e") 'ruby-end-of-defun)
    (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-p") 'ruby-beginning-of-block)
    (define-key map (kbd "M-C-n") 'ruby-end-of-block)
    (define-key map (kbd "M-C-h") 'ruby-mark-defun)
    (define-key map (kbd "M-C-q") 'ruby-indent-exp)
    (define-key map (kbd "C-M-h") 'backward-kill-word)
    (define-key map (kbd "C-j")   'reindent-then-newline-and-indent)
    (define-key map (kbd "C-m")   'newline)
154
    (define-key map (kbd "C-c C-c") 'comment-region)
Chong Yidong's avatar
Chong Yidong committed
155
    map)
156
  "Keymap used in Ruby mode.")
Chong Yidong's avatar
Chong Yidong committed
157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186

(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)
    (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)
187
  "Syntax table to use in Ruby mode.")
Chong Yidong's avatar
Chong Yidong committed
188 189

(defcustom ruby-indent-tabs-mode nil
190
  "Indentation can insert tabs in Ruby mode if this is non-nil."
Chong Yidong's avatar
Chong Yidong committed
191 192 193
  :type 'boolean :group 'ruby)

(defcustom ruby-indent-level 2
194
  "Indentation of Ruby statements."
Chong Yidong's avatar
Chong Yidong committed
195 196 197 198 199 200 201 202 203 204 205 206
  :type 'integer :group 'ruby)

(defcustom ruby-comment-column 32
  "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)
207 208
  "Deep indent lists in parenthesis when non-nil.
The value t means continuous line.
Chong Yidong's avatar
Chong Yidong committed
209 210 211 212 213 214 215 216 217 218 219 220
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
221
  "Insert a magic Emacs 'coding' comment upon save if this is non-nil."
Chong Yidong's avatar
Chong Yidong committed
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283
  :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)

(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 ()
284
  "Set up initial buffer-local variables for Ruby mode."
Chong Yidong's avatar
Chong Yidong committed
285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320
  (set-syntax-table ruby-mode-syntax-table)
  (setq local-abbrev-table ruby-mode-abbrev-table)
  (setq indent-tabs-mode ruby-indent-tabs-mode)
  (set (make-local-variable 'indent-line-function) 'ruby-indent-line)
  (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
             (or coding-system-for-write
                 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))))
        (setq coding-system
              (if coding-system
                  (symbol-name
                   (or (and ruby-use-encoding-map
                            (cdr (assq coding-system ruby-encoding-map)))
                       coding-system))
                "ascii-8bit"))
321
        (if (looking-at "^#!") (beginning-of-line 2))
Chong Yidong's avatar
Chong Yidong committed
322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342
        (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"))))))))

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

343
(defun ruby-indent-line (&optional ignored)
344
  "Correct the indentation of the current Ruby line."
Chong Yidong's avatar
Chong Yidong committed
345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385
  (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 ??)))))

(defun ruby-expr-beg (&optional option)
  "TODO: document."
  (save-excursion
    (store-match-data nil)
386
    (let ((space (skip-chars-backward " \t")))
Chong Yidong's avatar
Chong Yidong committed
387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434
      (cond
       ((bolp) t)
       ((progn
          (forward-char -1)
          (and (looking-at "\\?")
               (or (eq (char-syntax (char-before (point))) ?w)
                   (ruby-special-char-p))))
        nil)
       ((and (eq option 'heredoc) (< space 0)) t)
       ((or (looking-at ruby-operator-re)
            (looking-at "[\\[({,;]")
            (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))
                   (not (looking-at "\\s_")))
                  ((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)
435
  "TODO: document."
Chong Yidong's avatar
Chong Yidong committed
436 437 438 439 440 441 442 443 444 445
  (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)
446
  "TODO: document throughout function body."
Chong Yidong's avatar
Chong Yidong committed
447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596
  (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)))
       ((looking-at (concat "\\<\\(" ruby-block-beg-re "\\)\\>"))
        (and
         (save-match-data
           (or (not (looking-at (concat "do" ruby-keyword-end-re)))
               (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)
         (setq w (char-after (point)))
         (not (eq ?_ w))
         (not (eq ?! w))
         (not (eq ?? w))
         (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))
        (ruby-forward-string (buffer-substring (match-beginning 1) (match-end 1)) end))
597
       ((looking-at ":\\([-,.+*/%&|^~<>]=?\\|===?\\|<=>\\|![~=]?\\)")
Chong Yidong's avatar
Chong Yidong committed
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617
        (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)))
618
                 (line-end-position (point-at-eol))
Chong Yidong's avatar
Chong Yidong committed
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669
                 (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)
670
  "Return the indentation level in spaces NEST levels deeper than POS."
Chong Yidong's avatar
Chong Yidong committed
671 672 673
  (+ pos (* (or nest 1) ruby-indent-level)))

(defun ruby-calculate-indent (&optional parse-start)
674
  "Return the proper indentation level of the current line."
Chong Yidong's avatar
Chong Yidong committed
675 676 677 678 679
  ;; TODO: Document body
  (save-excursion
    (beginning-of-line)
    (let ((ruby-indent-point (point))
          (case-fold-search nil)
680
          state eol begin op-end
Chong Yidong's avatar
Chong Yidong committed
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
          (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)))))
732

Chong Yidong's avatar
Chong Yidong committed
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
       ((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))
                    ;; operator at the end of line
                    (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 "|"))))))
                       (or (not (eq ?/ c))
                           (null (nth 0 (ruby-parse-region (or begin parse-start) (point)))))
                       (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-electric-brace (arg)
836
  "Insert a brace and re-indent the current line."
Chong Yidong's avatar
Chong Yidong committed
837 838 839 840 841 842 843
  (interactive "P")
  (self-insert-command (prefix-numeric-value arg))
  (ruby-indent-line t))

;; TODO: Why isn't one ruby-*-of-defun written in terms of the other?
(defun ruby-beginning-of-defun (&optional arg)
  "Move backward to the beginning of the current top-level defun.
844
With ARG, move backward multiple defuns.  Negative ARG means
Chong Yidong's avatar
Chong Yidong committed
845 846 847 848 849 850 851 852
move forward."
  (interactive "p")
  (and (re-search-backward (concat "^\\(" ruby-block-beg-re "\\)\\b")
                           nil 'move (or arg 1))
       (beginning-of-line)))

(defun ruby-end-of-defun (&optional arg)
  "Move forward to the end of the current top-level defun.
853
With ARG, move forward multiple defuns.  Negative ARG means
Chong Yidong's avatar
Chong Yidong committed
854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
move backward."
  (interactive "p")
  (and (re-search-forward (concat "^\\(" ruby-block-end-re "\\)\\($\\|\\b[^_]\\)")
                          nil 'move (or arg 1))
       (beginning-of-line))
  (forward-line 1))

(defun ruby-beginning-of-indent ()
  "TODO: document"
  ;; I don't understand this function.
  ;; It seems like it should move to the line where indentation should deepen,
  ;; but ruby-indent-beg-re only accounts for whitespace before class, module and def,
  ;; so this will only match other block beginners at the beginning of the line.
  (and (re-search-backward (concat "^\\(" ruby-indent-beg-re "\\)\\b") nil 'move)
       (beginning-of-line)))

(defun ruby-move-to-block (n)
871
  "Move to the beginning (N < 0) or the end (N > 0) of the current block
Chong Yidong's avatar
Chong Yidong committed
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
or blocks containing the current block."
  ;; TODO: Make this work for n > 1,
  ;; make it not loop for n = 0,
  ;; document body
  (let (start pos done down)
    (setq start (ruby-calculate-indent))
    (setq down (looking-at (if (< n 0) ruby-block-end-re
                             (concat "\\<\\(" ruby-block-beg-re "\\)\\>"))))
    (while (and (not done) (not (if (< n 0) (bobp) (eobp))))
      (forward-line n)
      (cond
       ((looking-at "^\\s *$"))
       ((looking-at "^\\s *#"))
       ((and (> n 0) (looking-at "^=begin\\>"))
        (re-search-forward "^=end\\>"))
       ((and (< n 0) (looking-at "^=end\\>"))
        (re-search-backward "^=begin\\>"))
       (t
        (setq pos (current-indentation))
        (cond
         ((< start pos)
          (setq down t))
         ((and down (= pos start))
          (setq done t))
         ((> start pos)
          (setq done t)))))
      (if done
          (save-excursion
            (back-to-indentation)
            (if (looking-at (concat "\\<\\(" ruby-block-mid-re "\\)\\>"))
                (setq done nil))))))
  (back-to-indentation))

(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."
  ;; Passing a value > 1 to ruby-move-to-block currently doesn't work.
  (interactive)
  (ruby-move-to-block (or arg 1)))

(defun ruby-forward-sexp (&optional arg)
  "Move forward across one balanced expression (sexp).
920
With ARG, do it many times.  Negative ARG means move backward."
Chong Yidong's avatar
Chong Yidong committed
921 922 923 924 925 926 927 928
  ;; TODO: Document body
  (interactive "p")
  (if (and (numberp arg) (< arg 0))
      (ruby-backward-sexp (- arg))
    (let ((i (or arg 1)))
      (condition-case nil
          (while (> i 0)
            (skip-syntax-forward " ")
929
	    (if (looking-at ",\\s *") (goto-char (match-end 0)))
Chong Yidong's avatar
Chong Yidong committed
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
            (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)))
      i)))

(defun ruby-backward-sexp (&optional arg)
  "Move backward across one balanced expression (sexp).
963
With ARG, do it many times.  Negative ARG means move forward."
Chong Yidong's avatar
Chong Yidong committed
964 965 966 967 968 969 970 971 972 973 974 975 976
  ;; TODO: Document body
  (interactive "p")
  (if (and (numberp arg) (< arg 0))
      (ruby-forward-sexp (- arg))
    (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))
977
                     ((?q ?Q ?w ?W ?r ?x)
Chong Yidong's avatar
Chong Yidong committed
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
                      (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)))
      i)))

(defun ruby-mark-defun ()
  "Put mark at end of this Ruby function, point at beginning."
  (interactive)
  (push-mark (point))
  (ruby-end-of-defun)
  (push-mark (point) nil t)
  (ruby-beginning-of-defun)
  (re-search-backward "^\n" (- (point) 1) t))

1017 1018
(defun ruby-indent-exp (&optional ignored)
  "Indent each line in the balanced expression following the point."
Chong Yidong's avatar
Chong Yidong committed
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
  (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 ()
1039
  "Return the current method name as a string.
Chong Yidong's avatar
Chong Yidong committed
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 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
This string includes all namespaces.

For example:

  #exit
  String#gsub
  Net::HTTP#active?
  File::open.

See `add-log-current-defun-function'."
  ;; TODO: Document body
  ;; Why does this append a period to class methods?
  (condition-case nil
      (save-excursion
        (let (mname mlist (indent 0))
          ;; get current method (or class/module)
          (if (re-search-backward
               (concat "^[ \t]*\\(def\\|class\\|module\\)[ \t]+"
                       "\\("
                       ;; \\. and :: for class method
                        "\\([A-Za-z_]" ruby-symbol-re "*\\|\\.\\|::" "\\)"
                        "+\\)")
               nil t)
              (progn
                (setq mname (match-string 2))
                (unless (string-equal "def" (match-string 1))
                  (setq mlist (list mname) mname nil))
                (goto-char (match-beginning 1))
                (setq indent (current-column))
                (beginning-of-line)))
          ;; nest class/module
          (while (and (> indent 0)
                      (re-search-backward
                       (concat
                        "^[ \t]*\\(class\\|module\\)[ \t]+"
                        "\\([A-Z]" ruby-symbol-re "*\\)")
                       nil t))
            (goto-char (match-beginning 1))
            (if (< (current-column) indent)
                (progn
                  (setq mlist (cons (match-string 2) mlist))
                  (setq indent (current-column))
                  (beginning-of-line))))
          (when mname
            (let ((mn (split-string mname "\\.\\|::")))
              (if (cdr mn)
                  (progn
                    (cond
                     ((string-equal "" (car mn))
                      (setq mn (cdr mn) mlist nil))
                     ((string-equal "self" (car mn))
                      (setq mn (cdr mn)))
                     ((let ((ml (nreverse mlist)))
                        (while ml
                          (if (string-equal (car ml) (car mn))
                              (setq mlist (nreverse (cdr ml)) ml nil))
                          (or (setq ml (cdr ml)) (nreverse mlist))))))
                    (if mlist
                        (setcdr (last mlist) mn)
                      (setq mlist mn))
                    (setq mn (last mn 2))
                    (setq mname (concat "." (cadr mn)))
                    (setcdr mn nil))
                (setq mname (concat "#" mname)))))
          ;; generate string
          (if (consp mlist)
              (setq mlist (mapconcat (function identity) mlist "::")))
          (if mname
              (if mlist (concat mlist mname) mname)
            mlist)))))

1111 1112
(declare-function ruby-syntax-propertize-heredoc "ruby-mode" (limit))

1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
(if (eval-when-compile (fboundp #'syntax-propertize-rules))
    ;; New code that works independently from font-lock.
    (progn
      (defun ruby-syntax-propertize-function (start end)
        "Syntactic keywords for Ruby mode.  See `syntax-propertize-function'."
        (goto-char start)
        (ruby-syntax-propertize-heredoc end)
        (funcall
         (syntax-propertize-rules
          ;; #{ }, #$hoge, #@foo are not comments
          ("\\(#\\)[{$@]" (1 "."))
          ;; $' $" $` .... are variables
          ;; ?' ?" ?` are ascii codes
1126 1127 1128 1129 1130
          ("\\([?$]\\)[#\"'`]"
           (1 (unless (save-excursion
                        ;; Not within a string.
                        (nth 3 (syntax-ppss (match-beginning 0))))
                (string-to-syntax "\\"))))
1131
          ;; regexps
1132
          ("\\(^\\|[[=(,~?:;<>]\\|\\(^\\|\\s \\)\\(if\\|elsif\\|unless\\|while\\|until\\|when\\|and\\|or\\|&&\\|||\\)\\|g?sub!?\\|scan\\|split!?\\)\\s *\\(/\\)[^/\n\\\\]*\\(\\\\.[^/\n\\\\]*\\)*\\(/\\)"
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
           (4 "\"/")
           (6 "\"/"))
          ("^=en\\(d\\)\\_>" (1 "!"))
          ("^\\(=\\)begin\\_>" (1 "!"))
          ;; Handle here documents.
          ((concat ruby-here-doc-beg-re ".*\\(\n\\)")
           (7 (prog1 "\"" (ruby-syntax-propertize-heredoc end)))))
         (point) end))

      (defun ruby-syntax-propertize-heredoc (limit)
        (let ((ppss (syntax-ppss))
              (res '()))
          (when (eq ?\n (nth 3 ppss))
            (save-excursion
              (goto-char (nth 8 ppss))
              (beginning-of-line)
              (while (re-search-forward ruby-here-doc-beg-re
                                        (line-end-position) t)
                (push (concat (ruby-here-doc-end-match) "\n") res)))
            (let ((start (point)))
              ;; With multiple openers on the same line, we don't know in which
              ;; part `start' is, so we have to go back to the beginning.
              (when (cdr res)
                (goto-char (nth 8 ppss))
                (setq res (nreverse res)))
              (while (and res (re-search-forward (pop res) limit 'move))
                (if (null res)
                    (put-text-property (1- (point)) (point)
                                       'syntax-table (string-to-syntax "\""))))
              ;; Make extra sure we don't move back, lest we could fall into an
              ;; inf-loop.
              (if (< (point) start) (goto-char start))))))
      )
1166

1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
  ;; For Emacsen where syntax-propertize-rules is not (yet) available,
  ;; fallback on the old font-lock-syntactic-keywords stuff.

  (defconst ruby-here-doc-end-re
    "^\\([ \t]+\\)?\\(.*\\)\\(\n\\)"
    "Regexp to match the end of heredocs.

This will actually match any line with one or more characters.
It's useful in that it divides up the match string so that
`ruby-here-doc-beg-match' can search for the beginning of the heredoc.")

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

This should only be called after matching against `ruby-here-doc-end-re'."
Glenn Morris's avatar
Glenn Morris committed
1182 1183 1184
    (let ((contents (concat
                     (regexp-quote (concat (match-string 2) (match-string 3)))
                     (if (string= (match-string 3) "_") "\\B" "\\b"))))
1185 1186 1187
      (concat "<<"
              (let ((match (match-string 1)))
                (if (and match (> (length match) 0))
Glenn Morris's avatar
Glenn Morris committed
1188 1189 1190 1191
                    (concat "\\(?:-\\([\"']?\\)\\|\\([\"']\\)"
                            (match-string 1) "\\)"
                            contents "\\(\\1\\|\\2\\)")
                  (concat "-?\\([\"']\\|\\)" contents "\\1"))))))
1192 1193 1194

  (defconst ruby-font-lock-syntactic-keywords
    `( ;; #{ }, #$hoge, #@foo are not comments
Chong Yidong's avatar
Chong Yidong committed
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
    ("\\(#\\)[{$@]" 1 (1 . nil))
    ;; the last $', $", $` in the respective string is not variable
    ;; the last ?', ?", ?` in the respective string is not ascii code
    ("\\(^\\|[\[ \t\n<+\(,=]\\)\\(['\"`]\\)\\(\\\\.\\|\\2\\|[^'\"`\n\\\\]\\)*?\\\\?[?$]\\(\\2\\)"
     (2 (7 . nil))
     (4 (7 . nil)))
    ;; $' $" $` .... are variables
    ;; ?' ?" ?` are ascii codes
    ("\\(^\\|[^\\\\]\\)\\(\\\\\\\\\\)*[?$]\\([#\"'`]\\)" 3 (1 . nil))
    ;; regexps
1205
    ("\\(^\\|[[=(,~?:;<>]\\|\\(^\\|\\s \\)\\(if\\|elsif\\|unless\\|while\\|until\\|when\\|and\\|or\\|&&\\|||\\)\\|g?sub!?\\|scan\\|split!?\\)\\s *\\(/\\)[^/\n\\\\]*\\(\\\\.[^/\n\\\\]*\\)*\\(/\\)"
Chong Yidong's avatar
Chong Yidong committed
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230
     (4 (7 . ?/))
     (6 (7 . ?/)))
    ("^=en\\(d\\)\\_>" 1 "!")
    ("^\\(=\\)begin\\_>" 1 (ruby-comment-beg-syntax))
    ;; Currently, the following case is highlighted incorrectly:
    ;;
    ;;   <<FOO
    ;;   FOO
    ;;   <<BAR
    ;;   <<BAZ
    ;;   BAZ
    ;;   BAR
    ;;
    ;; This is because all here-doc beginnings are highlighted before any endings,
    ;; so although <<BAR is properly marked as a beginning, when we get to <<BAZ
    ;; it thinks <<BAR is part of a string so it's marked as well.
    ;;
    ;; This may be fixable by modifying ruby-in-here-doc-p to use
    ;; ruby-in-non-here-doc-string-p rather than syntax-ppss-context,
    ;; but I don't want to try that until we've got unit tests set up
    ;; to make sure I don't break anything else.
    (,(concat ruby-here-doc-beg-re ".*\\(\n\\)")
     ,(+ 1 (regexp-opt-depth ruby-here-doc-beg-re))
     (ruby-here-doc-beg-syntax))
    (,ruby-here-doc-end-re 3 (ruby-here-doc-end-syntax)))
Juanma Barranquero's avatar
Juanma Barranquero committed
1231
  "Syntactic keywords for Ruby mode.  See `font-lock-syntactic-keywords'.")
1232 1233

  (defun ruby-comment-beg-syntax ()
1234
  "Return the syntax cell for a the first character of a =begin.
Chong Yidong's avatar
Chong Yidong committed
1235 1236 1237 1238
See the definition of `ruby-font-lock-syntactic-keywords'.

This returns a comment-delimiter cell as long as the =begin
isn't in a string or another comment."
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
    (when (not (nth 3 (syntax-ppss)))
      (string-to-syntax "!")))

  (defun ruby-in-here-doc-p ()
    "Return whether or not the point is in a heredoc."
    (save-excursion
      (let ((old-point (point)) (case-fold-search nil))
        (beginning-of-line)
        (catch 'found-beg
          (while (re-search-backward ruby-here-doc-beg-re nil t)
            (if (not (or (ruby-in-ppss-context-p 'anything)
                         (ruby-here-doc-find-end old-point)))
                (throw 'found-beg t)))))))

  (defun ruby-here-doc-find-end (&optional limit)
    "Expects the point to be on a line with one or more heredoc openers.
Returns the buffer position at which all heredocs on the line
are terminated, or nil if they aren't terminated before the
buffer position `limit' or the end of the buffer."
    (save-excursion
      (beginning-of-line)
      (catch 'done
1261
        (let ((eol (point-at-eol))
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
              (case-fold-search nil)
              ;; Fake match data such that (match-end 0) is at eol
              (end-match-data (progn (looking-at ".*$") (match-data)))
              beg-match-data end-re)
          (while (re-search-forward ruby-here-doc-beg-re eol t)
            (setq beg-match-data (match-data))
            (setq end-re (ruby-here-doc-end-match))

            (set-match-data end-match-data)
            (goto-char (match-end 0))
            (unless (re-search-forward end-re limit t) (throw 'done nil))
            (setq end-match-data (match-data))

            (set-match-data beg-match-data)
            (goto-char (match-end 0)))
          (set-match-data end-match-data)
          (goto-char (match-end 0))
          (point)))))

  (defun ruby-here-doc-beg-syntax ()
    "Return the syntax cell for a line that may begin a heredoc.
See the definition of `ruby-font-lock-syntactic-keywords'.

This sets the syntax cell for the newline ending the line
containing the heredoc beginning so that cases where multiple
heredocs are started on one line are handled correctly."
    (save-excursion
      (goto-char (match-beginning 0))
      (unless (or (ruby-in-ppss-context-p 'non-heredoc)
                  (ruby-in-here-doc-p))
        (string-to-syntax "\""))))

  (defun ruby-here-doc-end-syntax ()
    "Return the syntax cell for a line that may end a heredoc.
See the definition of `ruby-font-lock-syntactic-keywords'."
    (let ((pss (syntax-ppss)) (case-fold-search nil))
      ;; If we aren't in a string, we definitely aren't ending a heredoc,
      ;; so we can just give up.
      ;; This means we aren't doing a full-document search
      ;; every time we enter a character.
      (when (ruby-in-ppss-context-p 'heredoc pss)
        (save-excursion
          (goto-char (nth 8 pss))    ; Go to the beginning of heredoc.
          (let ((eol (point)))
            (beginning-of-line)
            (if (and (re-search-forward (ruby-here-doc-beg-match) eol t) ; If there is a heredoc that matches this line...
                     (not (ruby-in-ppss-context-p 'anything)) ; And that's not inside a heredoc/string/comment...
                     (progn (goto-char (match-end 0)) ; And it's the last heredoc on its line...
                            (not (re-search-forward ruby-here-doc-beg-re eol t))))
                (string-to-syntax "\"")))))))
Chong Yidong's avatar
Chong Yidong committed
1312

1313 1314 1315 1316
  (unless (functionp 'syntax-ppss)
    (defun syntax-ppss (&optional pos)
      (parse-partial-sexp (point-min) (or pos (point)))))
  )
Chong Yidong's avatar
Chong Yidong committed
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326

(defun ruby-in-ppss-context-p (context &optional ppss)
  (let ((ppss (or ppss (syntax-ppss (point)))))
    (if (cond
         ((eq context 'anything)
          (or (nth 3 ppss)
              (nth 4 ppss)))
         ((eq context 'string)
          (nth 3 ppss))
         ((eq context 'heredoc)
1327
          (eq ?\n (nth 3 ppss)))
Chong Yidong's avatar
Chong Yidong committed
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350
         ((eq context 'non-heredoc)
          (and (ruby-in-ppss-context-p 'anything)
               (not (ruby-in-ppss-context-p 'heredoc))))
         ((eq context 'comment)
          (nth 4 ppss))
         (t
          (error (concat
                  "Internal error on `ruby-in-ppss-context-p': "
                  "context name `" (symbol-name context) "' is unknown"))))
        t)))

(if (featurep 'xemacs)
    (put 'ruby-mode 'font-lock-defaults
         '((ruby-font-lock-keywords)
           nil nil nil
           beginning-of-line
           (font-lock-syntactic-keywords
            . ruby-font-lock-syntactic-keywords))))

(defvar ruby-font-lock-syntax-table
  (let ((tbl (copy-syntax-table ruby-mode-syntax-table)))
    (modify-syntax-entry ?_ "w" tbl)
    tbl)
1351
  "The syntax table to use for fontifying Ruby mode buffers.
Chong Yidong's avatar
Chong Yidong committed
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423
See `font-lock-syntax-table'.")

(defconst ruby-font-lock-keywords
  (list
   ;; functions
   '("^\\s *def\\s +\\([^( \t\n]+\\)"
     1 font-lock-function-name-face)
   ;; keywords
   (cons (concat
          "\\(^\\|[^_:.@$]\\|\\.\\.\\)\\b\\(defined\\?\\|"
          (regexp-opt
           '("alias_method"
             "alias"
             "and"
             "begin"
             "break"
             "case"
             "catch"
             "class"
             "def"
             "do"
             "elsif"
             "else"
             "fail"
             "ensure"
             "for"
             "end"
             "if"
             "in"
             "module_function"
             "module"
             "next"
             "not"
             "or"
             "public"
             "private"
             "protected"
             "raise"
             "redo"
             "rescue"
             "retry"
             "return"
             "then"
             "throw"
             "super"
             "unless"
             "undef"
             "until"
             "when"
             "while"
             "yield")
           t)
          "\\)"
          ruby-keyword-end-re)
         2)
   ;; here-doc beginnings
   (list ruby-here-doc-beg-re 0 'font-lock-string-face)
   ;; variables
   '("\\(^\\|[^_:.@$]\\|\\.\\.\\)\\b\\(nil\\|self\\|true\\|false\\)\\>"
     2 font-lock-variable-name-face)
   ;; variables
   '("\\(\\$\\([^a-zA-Z0-9 \n]\\|[0-9]\\)\\)\\W"
     1 font-lock-variable-name-face)
   '("\\(\\$\\|@\\|@@\\)\\(\\w\\|_\\)+"
     0 font-lock-variable-name-face)
   ;; general delimited string
   '("\\(^\\|[[ \t\n<+(,=]\\)\\(%[xrqQwW]?\\([^<[{(a-zA-Z0-9 \n]\\)[^\n\\\\]*\\(\\\\.[^\n\\\\]*\\)*\\(\\3\\)\\)"
     (2 font-lock-string-face))
   ;; constants
   '("\\(^\\|[^_]\\)\\b\\([A-Z]+\\(\\w\\|_\\)*\\)"
     2 font-lock-type-face)
   ;; symbols
1424
   '("\\(^\\|[^:]\\)\\(:\\([-+~]@?\\|[/%&|^`]\\|\\*\\*?\\|<\\(<\\|=>?\\)?\\|>[>=]?\\|===?\\|=~\\|![~=]?\\|\\[\\]=?\\|\\(\\w\\|_\\)+\\([!?=]\\|\\b_*\\)\\|#{[^}\n\\\\]*\\(\\\\.[^}\n\\\\]*\\)*}\\)\\)"
Chong Yidong's avatar
Chong Yidong committed
1425
     2 font-lock-reference-face)
1426
   '("\\(^\\s *\\|[\[\{\(,]\\s *\\|\\sw\\s +\\)\\(\\(\\sw\\|_\\)+\\):[^:]" 2 font-lock-reference-face)
Chong Yidong's avatar
Chong Yidong committed
1427 1428 1429 1430 1431 1432 1433
   ;; expression expansion
   '("#\\({[^}\n\\\\]*\\(\\\\.[^}\n\\\\]*\\)*}\\|\\(\\$\\|@\\|@@\\)\\(\\w\\|_\\)+\\)"
     0 font-lock-variable-name-face t)
   ;; warn lower camel case
                                        ;'("\\<[a-z]+[a-z0-9]*[A-Z][A-Za-z0-9]*\\([!?]?\\|\\>\\)"
                                        ;  0 font-lock-warning-face)
   )
1434
  "Additional expressions to highlight in Ruby mode.")
Chong Yidong's avatar
Chong Yidong committed
1435 1436

;;;###autoload
1437
(define-derived-mode ruby-mode prog-mode "Ruby"
Chong Yidong's avatar
Chong Yidong committed
1438 1439 1440 1441 1442
  "Major mode for editing Ruby scripts.
\\[ruby-indent-line] properly indents subexpressions of multi-line
class, module, def, if, while, for, do, and case statements, taking
nesting into account.

1443 1444
The variable `ruby-indent-level' controls the amount of indentation.

Chong Yidong's avatar
Chong Yidong committed
1445 1446 1447 1448 1449 1450 1451 1452 1453
\\{ruby-mode-map}"
  (ruby-mode-variables)

  (set (make-local-variable 'imenu-create-index-function)
       'ruby-imenu-create-index)
  (set (make-local-variable 'add-log-current-defun-function)
       'ruby-add-log-current-method)

  (add-hook
1454
   (cond ((boundp 'before-save-hook) 'before-save-hook)
Chong Yidong's avatar
Chong Yidong committed
1455 1456
         ((boundp 'write-contents-functions) 'write-contents-functions)
         ((boundp 'write-contents-hooks) 'write-contents-hooks))
1457 1458 1459
   'ruby-mode-set-encoding nil 'local)

  (set (make-local-variable 'electric-indent-chars)
1460
       (append '(?\{ ?\}) electric-indent-chars))
Chong Yidong's avatar
Chong Yidong committed
1461 1462 1463 1464 1465 1466 1467 1468

  (set (make-local-variable 'font-lock-defaults)
       '((ruby-font-lock-keywords) nil nil))
  (set (make-local-variable 'font-lock-keywords)
       ruby-font-lock-keywords)
  (set (make-local-variable 'font-lock-syntax-table)
       ruby-font-lock-syntax-table)

1469 1470 1471 1472 1473
  (if (eval-when-compile (fboundp 'syntax-propertize-rules))
      (set (make-local-variable 'syntax-propertize-function)
           #'ruby-syntax-propertize-function)
    (set (make-local-variable 'font-lock-syntactic-keywords)
         ruby-font-lock-syntactic-keywords)))
Chong Yidong's avatar
Chong Yidong committed
1474 1475 1476 1477

;;; Invoke ruby-mode when appropriate

;;;###autoload
1478
(add-to-list 'auto-mode-alist (cons (purecopy "\\.rb\\'") 'ruby-mode))
Chong Yidong's avatar
Chong Yidong committed
1479 1480

;;;###autoload
1481
(dolist (name (list "ruby" "rbx" "jruby" "ruby1.9" "ruby1.8"))
1482
  (add-to-list 'interpreter-mode-alist (cons (purecopy name) 'ruby-mode)))
Chong Yidong's avatar
Chong Yidong committed
1483 1484 1485 1486

(provide 'ruby-mode)

;;; ruby-mode.el ends here