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ruby-mode.el
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;;; ruby-mode.el --- Major mode for editing Ruby files
;; Copyright (C) 1994-2008 Yukihiro Matsumoto, Nobuyoshi Nakada
;; Authors: Yukihiro Matsumoto, Nobuyoshi Nakada
;; URL: http://www.emacswiki.org/cgi-bin/wiki/RubyMode
;; Created: Fri Feb 4 14:49:13 JST 1994
;; Keywords: languages ruby
;; Version: 1.1
;; This file is not yet part of GNU Emacs.
;;; 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.
;;
;; This version has a few changes to the default indentation rules.
;; See http://github.com/psanford/ruby-mode for more details.
;;; Code:
(eval-when-compile (require 'cl))
(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\\>")
(defconst ruby-here-doc-beg-re
"\\(<\\)<\\(-\\)?\\(\\([a-zA-Z0-9_]+\\)\\|[\"]\\([^\"]+\\)[\"]\\|[']\\([^']+\\)[']\\)"
"Regexp to match the beginning of a heredoc.")
(defconst ruby-here-doc-end-re
"^\\([ \t]+\\)?\\(.*\\)\\(.\\)$"
"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-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)))))
(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'."
(let ((contents (regexp-quote (concat (match-string 2) (match-string 3)))))
(concat "<<"
(let ((match (match-string 1)))
(if (and match (> (length match) 0))
(concat "\\(?:-\\([\"']?\\)\\|\\([\"']\\)" (match-string 1) "\\)"
contents "\\b\\(\\1\\|\\2\\)")
(concat "-?\\([\"']\\|\\)" contents "\\b\\1"))))))
(defconst ruby-delimiter
(concat "[?$/%(){}#\"'`.:]\\|<<\\|\\[\\|\\]\\|\\<\\("
ruby-block-beg-re
"\\)\\>\\|" ruby-block-end-re
"\\|^=begin\\|" ruby-here-doc-beg-re))
(defconst ruby-negative
(concat "^[ \t]*\\(\\(" ruby-block-mid-re "\\)\\>\\|"
ruby-block-end-re "\\|}\\|\\]\\|)\\)")
"Regexp to match where the indentation gets shallower.")
(defconst ruby-operator-re "[-,.+*/%&|^~=<>:]"
"Regexp to match operators.")
(defconst ruby-symbol-chars "a-zA-Z0-9_"
"List of characters that symbol names may contain.")
(defconst ruby-symbol-re (concat "[" ruby-symbol-chars "]")
"Regexp to match symbols.")
(defvar ruby-mode-abbrev-table nil
"Abbrev table in use in ruby-mode buffers.")
(define-abbrev-table 'ruby-mode-abbrev-table ())
(defvar ruby-mode-map
(let ((map (make-sparse-keymap)))
(define-key map "{" 'ruby-electric-brace)
(define-key map "}" 'ruby-electric-brace)
(define-key map (kbd "M-C-a") 'ruby-beginning-of-defun)
(define-key map (kbd "M-C-e") 'ruby-end-of-defun)
(define-key map (kbd "M-C-b") 'ruby-backward-sexp)
(define-key map (kbd "M-C-f") 'ruby-forward-sexp)
(define-key map (kbd "M-C-p") 'ruby-beginning-of-block)
(define-key map (kbd "M-C-n") 'ruby-end-of-block)
(define-key map (kbd "M-C-h") 'ruby-mark-defun)
(define-key map (kbd "M-C-q") 'ruby-indent-exp)
(define-key map (kbd "TAB") 'ruby-indent-line)
(define-key map (kbd "C-M-h") 'backward-kill-word)
(define-key map (kbd "C-j") 'reindent-then-newline-and-indent)
(define-key map (kbd "C-m") 'newline)
map)
"Keymap used in ruby-mode.")
(defvar ruby-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?\' "\"" table)
(modify-syntax-entry ?\" "\"" table)
(modify-syntax-entry ?\` "\"" table)
(modify-syntax-entry ?# "<" table)
(modify-syntax-entry ?\n ">" table)
(modify-syntax-entry ?\\ "\\" table)
(modify-syntax-entry ?$ "." 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)
"Syntax table to use in ruby-mode.")
(defcustom ruby-indent-tabs-mode nil
"Indentation can insert tabs in ruby mode if this is non-nil."
:type 'boolean :group 'ruby)
(defcustom ruby-indent-level 2
"Indentation of ruby statements."
: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)
"Deep indent lists in parenthesis when non-nil. t means continuous line.
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
"*Insert a magic emacs 'coding' comment upon save if this is non-nil."
: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 ()
"Set up initial buffer-local variables for ruby-mode."
(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-variable-buffer-local 'comment-start) "# ")
(set (make-variable-buffer-local 'comment-end) "")
(set (make-variable-buffer-local 'comment-column) ruby-comment-column)
(set (make-variable-buffer-local '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"))
(if (looking-at "^#![^\n]*ruby") (beginning-of-line 2))
(cond ((looking-at "\\s *#.*-\*-\\s *\\(en\\)?coding\\s *:\\s *\\([-a-z0-9_]*\\)\\s *\\(;\\|-\*-\\)")
(unless (string= (match-string 2) coding-system)
(goto-char (match-beginning 2))
(delete-region (point) (match-end 2))
(and (looking-at "-\*-")
(let ((n (skip-chars-backward " ")))
(cond ((= n 0) (insert " ") (backward-char))
((= n -1) (insert " "))
((forward-char)))))
(insert coding-system)))
((looking-at "\\s *#.*coding\\s *[:=]"))
(t (when ruby-insert-encoding-magic-comment
(insert "# -*- coding: " coding-system " -*-\n")))
)))))
;;;###autoload
(defun ruby-mode ()
"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.
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)
(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
(cond ((boundp 'before-save-hook)
(make-local-variable 'before-save-hook)
'before-save-hook)
((boundp 'write-contents-functions) 'write-contents-functions)
((boundp 'write-contents-hooks) 'write-contents-hooks))
'ruby-mode-set-encoding)
(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)
(set (make-local-variable 'font-lock-syntactic-keywords) ruby-font-lock-syntactic-keywords)
(if (fboundp 'run-mode-hooks)
(run-mode-hooks 'ruby-mode-hook)
(run-hooks 'ruby-mode-hook)))
(defun ruby-current-indentation ()
"Return the indentation level of current line."
(save-excursion
(beginning-of-line)
(back-to-indentation)
(current-column)))
(defun ruby-indent-line (&optional flag)
"Correct the indentation of the current ruby line."
(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 pnt)
"Return t if the character before PNT (default `point') is a special character.
Special characters are `?', `$', `:' when preceded by whitespace,
and `\\' when preceded by `?'."
(setq pnt (or pnt (point)))
(let ((c (char-before pnt)) (b (and (< (point-min) pnt) (char-before (1- pnt)))))
(cond ((or (eq c ??) (eq c ?$)))
((and (eq c ?:) (or (not b) (eq (char-syntax b) ? ))))
((eq c ?\\) (eq b ??)))))
(defun ruby-expr-beg (&optional option)
"TODO: document."
(save-excursion
(store-match-data nil)
(let ((space (skip-chars-backward " \t"))
(start (point)))
(cond
((bolp) t)
((progn
(forward-char -1)
(and (looking-at "\\?")
(or (eq (char-syntax (char-before (point))) ?w)
(ruby-special-char-p))))
nil)
((and (eq option 'heredoc) (< space 0)) t)
((or (looking-at ruby-operator-re)
(looking-at "[\\[({,;]")
(and (looking-at "[!?]")
(or (not (eq option 'modifier))
(bolp)
(save-excursion (forward-char -1) (looking-at "\\Sw$"))))
(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)
"TODO: document."
(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-same-line (p1 p2)
"Return t if p1 and p2 are on the same line."
(save-excursion
(goto-char p1)
(and (>= p2 (point-at-bol))
(<= p2 (point-at-eol)))))
(defun ruby-hash-context-p (start end)
"Returns t if it looks like this region has key value pairs"
(save-excursion
(save-restriction
(narrow-to-region start end)
(goto-char (point-min))
(when (search-forward-regexp "\\(=>\\|)\\)" nil t)
(string-equal "=>" (match-string 1))))))
(defun ruby-open-list-p (state)
"Returns true if it looks like this is the opening of a list or array"
(let ((char (car state)))
(or
(eq char ?\[)
(and
(eq char ?\()
(not (ruby-hash-context-p (nth 1 state) (point)))))))
(defun ruby-parse-partial (&optional end in-string nest depth pcol indent)
"TODO: document throughout function body."
(or depth (setq depth 0))
(or indent (setq indent 0))
(when (re-search-forward ruby-delimiter end 'move)
(let ((pnt (point)) w re expand previous-nest)
(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 (list (char-after (point)) pnt depth) nest))
(setq pcol (cons (cons pnt depth) pcol))
(setq depth 0))
(setq previous-nest (car nest))
(setq nest (cons (list (char-after (point)) pnt depth) nest))
;; same line as previous open [{(, don't indent again
(if (and previous-nest
(ruby-open-list-p previous-nest)
(and (not (eq (car previous-nest) (caar nest)))))
nil ;; no-op
(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 depth (nth 2 (car nest)))
(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 (list nil pnt depth) 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 (list nil pnt depth) 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))
((looking-at ":\\([-,.+*/%&|^~<>]=?\\|===?\\|<=>\\)")
(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)))
(line-end-position (save-excursion (end-of-line) (point)))
(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))
((looking-at ruby-here-doc-beg-re)
(if (re-search-forward (ruby-here-doc-end-match)
indent-point t)
(forward-line 1)
(setq in-string (match-end 0))
(goto-char 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)
"Returns the indentation level in spaces NEST levels deeper than POS."
(+ pos (* (or nest 1) ruby-indent-level)))
(defun ruby-calculate-indent (&optional parse-start)
"Returns the proper indentation level of the current line."
;; TODO: Document body
(save-excursion
(beginning-of-line)
(let ((indent-point (point))
(case-fold-search nil)
state bol eol begin op-end
(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 indent-point))
(cond
((nth 0 state) ; within string
(setq indent nil)) ; do nothing
((car (nth 1 state)) ; in paren
(goto-char (setq begin (nth 1 (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) indent-point)))
(and (nth 2 s) (> (nth 2 s) 0)
(or (goto-char (nth 1 (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 (nth 1 (nth 1 state)))
(error "invalid nest"))
(goto-char (nth 1 (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)))))
((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 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))))
(setq bol (point))
(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 (nth 1 (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 indent-point)
(beginning-of-line)
(skip-syntax-forward " ")
(if (looking-at "\\.[^.]")
(+ indent ruby-indent-level)
indent))))
(defun ruby-electric-brace (arg)
"Inserts a brace and re-indents the current line."
(interactive "P")
(self-insert-command (prefix-numeric-value arg))
(ruby-indent-line t))
(eval-when-compile
(defmacro defun-region-command (func args &rest body)
"TODO: document."
;; If we drop xemacs support, we can replace this macro with a simple defun
(let ((intr (car body)))
(when (featurep 'xemacs)
(if (stringp intr) (setq intr (cadr body)))
(and (eq (car intr) 'interactive)
(setq intr (cdr intr))
(setcar intr (concat "_" (car intr)))))
(cons 'defun (cons func (cons args body))))))
;; TODO: Why isn't one ruby-*-of-defun written in terms of the other?
(defun-region-command ruby-beginning-of-defun (&optional arg)
"Move backward to the beginning of the current top-level defun.
With ARG, move backward multiple defuns. Negative ARG means
move forward."
(interactive "p")
(and (re-search-backward (concat "^\\(" ruby-block-beg-re "\\)\\_>")
nil 'move (or arg 1))
(beginning-of-line)))
(defun-region-command ruby-end-of-defun (&optional arg)
"Move forward to the end of the current top-level defun.
With ARG, move forward multiple defuns. Negative ARG means
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 "\\)\\_>") nil 'move)
(beginning-of-line)))
(defun ruby-move-to-block (n)
"Moves to the beginning (N < 0) or the end (N > 0) of the current block
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-region-command 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-region-command ruby-end-of-block (&optional arg)
"Move forward to the end of the current block.