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+;;;
+;;; ruby-mode.el -
+;;;
+;;; $Author$
+;;; $Revision$
+;;; $Date$
+;;; created at: Fri Feb 4 14:49:13 JST 1994
+;;;
+
+(defconst ruby-block-beg-re
+ "class\\|module\\|def\\|if\\|case\\|while\\|do\\|for\\|protect"
+ )
+
+(defconst ruby-block-mid-re
+ "else\\|elsif\\|when\\|using\\|resque\\|ensure"
+ )
+
+(defconst ruby-block-end-re
+ (concat "\\(end\\([ \t]+\\(" ruby-block-beg-re "\\)\\)?\\)")
+ )
+
+(defconst ruby-delimiter
+ (concat "(\\|)\\|\\{\\|\\}\\|\"\\|\'\\|\\b\\(" ruby-block-beg-re "\\|" ruby-block-end-re "\\)\\b\\|#")
+ )
+(defconst ruby-negative
+ (concat "^[ \t]*\\b\\(\\(" ruby-block-mid-re "\\)\\|\\(" ruby-block-end-re "\\)\\)\\b")
+ )
+
+(defvar ruby-mode-abbrev-table nil
+ "Abbrev table in use in ruby-mode buffers.")
+
+(define-abbrev-table 'ruby-mode-abbrev-table ())
+
+(defvar ruby-mode-map nil "Keymap used in ruby mode.")
+
+(if ruby-mode-map
+ nil
+ (setq ruby-mode-map (make-sparse-keymap))
+ (define-key ruby-mode-map "\e\C-a" 'ruby-beginning-of-defun)
+ (define-key ruby-mode-map "\e\C-e" 'ruby-end-of-defun)
+ (define-key ruby-mode-map "\t" 'ruby-indent-command)
+ (define-key ruby-mode-map "\t" 'ruby-indent-command)
+ (define-key ruby-mode-map "\C-m" 'ruby-reindent-then-newline-and-indent)
+ (define-key ruby-mode-map "\C-j" 'newline))
+
+(defvar ruby-mode-syntax-table nil
+ "Syntax table in use in ruby-mode buffers.")
+
+(if ruby-mode-syntax-table
+ ()
+ (setq ruby-mode-syntax-table (make-syntax-table))
+ (modify-syntax-entry ?\' "\"" ruby-mode-syntax-table)
+ (modify-syntax-entry ?\" "\"" ruby-mode-syntax-table)
+ (modify-syntax-entry ?\n "> " ruby-mode-syntax-table)
+ (modify-syntax-entry ?\f "> " ruby-mode-syntax-table)
+ (modify-syntax-entry ?# "< " ruby-mode-syntax-table)
+ (modify-syntax-entry ?_ "w" ruby-mode-syntax-table)
+ (modify-syntax-entry ?< "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?> "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?& "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?| "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?$ "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?% "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?= "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?/ "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?+ "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?* "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?- "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?\; "." ruby-mode-syntax-table)
+ (modify-syntax-entry ?\( "()" ruby-mode-syntax-table)
+ (modify-syntax-entry ?) ")(" ruby-mode-syntax-table)
+ (modify-syntax-entry ?{ "(}" ruby-mode-syntax-table)
+ (modify-syntax-entry ?} "){" ruby-mode-syntax-table)
+ (modify-syntax-entry ?\[ "(]" ruby-mode-syntax-table)
+ (modify-syntax-entry ?\] ")[" ruby-mode-syntax-table)
+ )
+
+(defvar ruby-indent-level 2
+ "*Indentation of ruby statements.")
+
+(defun ruby-mode-variables ()
+ (setq local-abbrev-table ruby-mode-abbrev-table)
+ (make-local-variable 'indent-line-function)
+ (setq indent-line-function 'ruby-indent-line)
+ (make-local-variable 'require-final-newline)
+ (setq require-final-newline t)
+ (make-variable-buffer-local 'comment-start)
+ (setq comment-start "# ")
+ (make-variable-buffer-local 'comment-end)
+ (setq comment-end "")
+ (make-variable-buffer-local 'comment-column)
+ (setq comment-column 32)
+ (make-variable-buffer-local 'comment-start-skip)
+ (setq comment-start-skip "#+ *")
+ (make-local-variable 'parse-sexp-ignore-comments)
+ (setq parse-sexp-ignore-comments t))
+
+(defun ruby-mode ()
+ "Major mode for editing ruby scripts.
+\\[ruby-indent-command] properly indents subexpressions of multi-line
+class, module, def, if, while, for, do, and case statements, taking
+nesting into account.
+
+The variable ruby-indent-level controls the amount of indentation.
+\\{ruby-mode-map}"
+ (interactive)
+ (kill-all-local-variables)
+ (use-local-map ruby-mode-map)
+ (setq mode-name "ruby")
+ (setq major-mode 'ruby-mode)
+ (set-syntax-table ruby-mode-syntax-table)
+ (ruby-mode-variables)
+ (run-hooks 'ruby-mode-hook))
+
+(defun ruby-current-indentation ()
+ (save-excursion
+ (beginning-of-line)
+ (back-to-indentation)
+ (current-column)))
+
+(defun ruby-delete-indentation ()
+ (let
+ ((b nil)
+ (m nil))
+ (save-excursion
+ (beginning-of-line)
+ (setq b (point))
+ (back-to-indentation)
+ (setq m (point)))
+ (delete-region b m)))
+
+(defun ruby-indent-line (&optional flag)
+ "Correct indentation of the current ruby line."
+ (let
+ ((x (ruby-calculate-indent)))
+ (ruby-indent-to x)))
+
+(defun ruby-indent-command ()
+ (interactive)
+ (ruby-indent-line t))
+
+(defun ruby-indent-to (x)
+ (let ((p nil) beg end)
+ (if (null x)
+ nil
+ (setq p (- (current-column) (ruby-current-indentation)))
+ (ruby-delete-indentation)
+ (beginning-of-line)
+ (save-excursion
+ (setq beg (point))
+ (forward-line 1)
+ (setq end (point)))
+ (indent-to x)
+ (if (> p 0) (forward-char p)))))
+
+(defun ruby-parse-region (start end)
+ (let ((indent-point end)
+ (indent 0)
+ (in-string nil)
+ (in-paren nil)
+ (depth 0)
+ (nest nil))
+ (save-excursion
+ (if start
+ (goto-char start)
+ (ruby-beginning-of-defun))
+ (while (and (> indent-point (point))
+ (re-search-forward ruby-delimiter indent-point t))
+ (let ((w (buffer-substring (match-beginning 0) (match-end 0))))
+ (cond
+ ((or (string= "\"" w) ;skip string
+ (string= "\'" w))
+ (if (search-forward w indent-point t)
+ nil
+ (goto-char indent-point)
+ (setq in-string t)))
+ ((string= "#" w) ;skip comment
+ (forward-line 1))
+ ((string= "(" w) ;skip to matching paren
+ (let ((orig depth))
+ (setq nest (cons (point) nest))
+ (setq depth (1+ depth))
+ (while (and (/= depth orig)
+ (re-search-forward "[()]" indent-point t))
+ (cond
+ ((= (char-after (match-beginning 0)) ?\( )
+ (setq nest (cons (point) nest))
+ (setq depth (1+ depth)))
+ (t
+ (setq nest (cdr nest))
+ (setq depth (1- depth)))))
+ (if (> depth orig) (setq in-paren t))))
+ ((string= "{" w) ;skip to matching paren
+ (let ((orig depth))
+ (setq nest (cons (point) nest))
+ (setq depth (1+ depth))
+ (while (and (/= depth orig)
+ (re-search-forward "[{}]" indent-point t))
+ (cond
+ ((= (char-after (match-beginning 0)) ?\{ )
+ (setq nest (cons (point) nest))
+ (setq depth (1+ depth)))
+ (t
+ (setq nest (cdr nest))
+ (setq depth (1- depth)))))
+ (if (> depth orig) (setq in-paren t))))
+ ((string-match "^end" w)
+ (setq nest (cdr nest))
+ (setq depth (1- depth)))
+ ((string-match ruby-block-beg-re w)
+ (setq nest (cons (point) nest))
+ (setq depth (1+ depth)))
+ (t
+ (error (format "bad string %s" w)))))))
+ (if in-paren (message "in-paren"))
+ (list in-string in-paren (car nest) depth)))
+
+(defun ruby-calculate-indent (&optional parse-start)
+ (save-excursion
+ (beginning-of-line)
+ (let ((indent-point (point))
+ (case-fold-search nil)
+ state eol
+ (indent 0))
+ (if parse-start
+ (goto-char parse-start)
+ (beginning-of-defun)
+ (setq parse-start (point)))
+ (setq state (ruby-parse-region parse-start indent-point))
+ (cond
+ ((nth 0 state) ; within string
+ (setq indent nil)) ; do nothing
+
+ ((nth 1 state) ; in paren
+ (goto-char (nth 2 state))
+ (setq indent
+ (if (looking-at "$")
+ (+ (current-indentation) ruby-indent-level)
+ (current-column))))
+
+ ((> (nth 3 state) 0) ; in nest
+ (goto-char (nth 2 state))
+ (forward-word -1) ; skip back a keyword
+ (setq indent (+ (current-column) ruby-indent-level)))
+
+ (t ; toplevel
+ (setq indent 0)))
+ (goto-char indent-point)
+ (end-of-line)
+ (setq eol (point))
+ (beginning-of-line)
+ (if (re-search-forward ruby-negative eol t)
+ (setq indent (- indent ruby-indent-level)))
+ indent)))
+
+(defun ruby-beginning-of-defun (&optional arg)
+ "Move backward to next beginning-of-defun.
+With argument, do this that many times.
+Returns t unless search stops due to end of buffer."
+ (interactive "p")
+ (and (re-search-backward (concat "^\\(" ruby-block-beg-re "\\)")
+ nil 'move (or arg 1))
+ (progn (beginning-of-line) t)))
+
+(defun ruby-end-of-defun (&optional arg)
+ "Move forward to next end of defun.
+An end of a defun is found by moving forward from the beginning of one."
+ (interactive "p")
+ (and (re-search-forward (concat "^\\(" ruby-block-end-re "\\)")
+ nil 'move (or arg 1))
+ (progn (beginning-of-line) t))
+ (forward-line 1))
+
+(defun ruby-reindent-then-newline-and-indent ()
+ (interactive "*")
+ (save-excursion
+ (delete-region (point) (progn (skip-chars-backward " \t") (point))))
+ (insert ?\n)
+ (save-excursion
+ (forward-line -1)
+ (indent-according-to-mode))
+ (indent-according-to-mode))
+
+(defun ruby-encomment-region (beg end)
+ (interactive "r")
+ (save-excursion
+ (goto-char beg)
+ (while (re-search-forward "^" end t)
+ (replace-match "#" nil nil))))
+
+(defun ruby-decomment-region (beg end)
+ (interactive "r")
+ (save-excursion
+ (goto-char beg)
+ (while (re-search-forward "^\\([ \t]*\\)#" end t)
+ (replace-match "\\1" nil nil))))