;;; js.el --- Major mode for editing JavaScript -*- lexical-binding: t -*-
-;; Copyright (C) 2008-2014 Free Software Foundation, Inc.
+;; Copyright (C) 2008-2015 Free Software Foundation, Inc.
;; Author: Karl Landstrom <karl.landstrom@brgeight.se>
;; Daniel Colascione <dan.colascione@gmail.com>
(defconst js--function-heading-1-re
(concat
- "^\\s-*function\\s-+\\(" js--name-re "\\)")
+ "^\\s-*function\\(?:\\s-\\|\\*\\)+\\(" js--name-re "\\)")
"Regexp matching the start of a JavaScript function header.
Match group 1 is the name of the function.")
:type 'integer
:group 'js)
+(defcustom js-indent-first-init nil
+ "Non-nil means specially indent the first variable declaration's initializer.
+Normally, the first declaration's initializer is unindented, and
+subsequent declarations have their identifiers aligned with it:
+
+ var o = {
+ foo: 3
+ };
+
+ var o = {
+ foo: 3
+ },
+ bar = 2;
+
+If this option has the value t, indent the first declaration's
+initializer by an additional level:
+
+ var o = {
+ foo: 3
+ };
+
+ var o = {
+ foo: 3
+ },
+ bar = 2;
+
+If this option has the value `dynamic', if there is only one declaration,
+don't indent the first one's initializer; otherwise, indent it.
+
+ var o = {
+ foo: 3
+ };
+
+ var o = {
+ foo: 3
+ },
+ bar = 2;"
+ :version "25.1"
+ :type '(choice (const nil) (const t) (const dynamic))
+ :safe 'symbolp
+ :group 'js)
+
;;; KeyMap
(defvar js-mode-map
(let ((table (make-syntax-table)))
(c-populate-syntax-table table)
(modify-syntax-entry ?$ "_" table)
+ (modify-syntax-entry ?` "\"" table)
table)
"Syntax table for `js-mode'.")
(let ((name t))
(forward-word)
(forward-comment most-positive-fixnum)
+ (when (eq (char-after) ?*)
+ (forward-char)
+ (forward-comment most-positive-fixnum))
(when (looking-at js--name-re)
(setq name (match-string-no-properties 0))
(goto-char (match-end 0)))
js--font-lock-keywords-3)
"Font lock keywords for `js-mode'. See `font-lock-keywords'.")
+(defconst js--syntax-propertize-regexp-syntax-table
+ (let ((st (make-char-table 'syntax-table (string-to-syntax "."))))
+ (modify-syntax-entry ?\[ "(]" st)
+ (modify-syntax-entry ?\] ")[" st)
+ (modify-syntax-entry ?\\ "\\" st)
+ st))
+
(defun js-syntax-propertize-regexp (end)
- (when (eq (nth 3 (syntax-ppss)) ?/)
- ;; A /.../ regexp.
- (when (re-search-forward "\\(?:\\=\\|[^\\]\\)\\(?:\\\\\\\\\\)*/" end 'move)
- (put-text-property (1- (point)) (point)
- 'syntax-table (string-to-syntax "\"/")))))
+ (let ((ppss (syntax-ppss)))
+ (when (eq (nth 3 ppss) ?/)
+ ;; A /.../ regexp.
+ (while
+ (when (re-search-forward "\\(?:\\=\\|[^\\]\\)\\(?:\\\\\\\\\\)*/"
+ end 'move)
+ (if (nth 1 (with-syntax-table
+ js--syntax-propertize-regexp-syntax-table
+ (let ((parse-sexp-lookup-properties nil))
+ (parse-partial-sexp (nth 8 ppss) (point)))))
+ ;; A / within a character class is not the end of a regexp.
+ t
+ (put-text-property (1- (point)) (point)
+ 'syntax-table (string-to-syntax "\"/"))
+ nil))))))
(defun js-syntax-propertize (start end)
;; Javascript allows immediate regular expression objects, written /.../.
;; We can probably just add +, -, !, <, >, %, ^, ~, |, &, ?, : at which
;; point I think only * and / would be missing which could also be added,
;; but need care to avoid affecting the // and */ comment markers.
- ("\\(?:^\\|[=([{,:;]\\)\\(?:[ \t]\\)*\\(/\\)[^/*]"
+ ("\\(?:^\\|[=([{,:;]\\|\\_<return\\_>\\)\\(?:[ \t]\\)*\\(/\\)[^/*]"
(1 (ignore
(forward-char -1)
(when (or (not (memq (char-after (match-beginning 0)) '(?\s ?\t)))
"Regular expression matching variable declaration keywords.")
(defconst js--indent-operator-re
- (concat "[-+*/%<>=&^|?:.]\\([^-+*/]\\|$\\)\\|"
+ (concat "[-+*/%<>&^|?:.]\\([^-+*/]\\|$\\)\\|!?=\\|"
(js--regexp-opt-symbol '("in" "instanceof")))
"Regexp matching operators that affect indentation of continued expressions.")
(save-excursion (backward-char) (not (looking-at "[/*]/")))
(js--looking-at-operator-p)
(and (progn (backward-char)
- (not (looking-at "++\\|--\\|/[/*]"))))))))))
+ (not (looking-at "+\\+\\|--\\|/[/*]"))))))))))
(defun js--end-of-do-while-loop-p ()
(goto-char for-kwd)
(current-column))))
+(defun js--maybe-goto-declaration-keyword-end (parse-status)
+ "Helper function for `js--proper-indentation'.
+Depending on the value of `js-indent-first-init', move
+point to the end of a variable declaration keyword so that
+indentation is aligned to that column."
+ (cond
+ ((eq js-indent-first-init t)
+ (when (looking-at js--declaration-keyword-re)
+ (goto-char (1+ (match-end 0)))))
+ ((eq js-indent-first-init 'dynamic)
+ (let ((bracket (nth 1 parse-status))
+ declaration-keyword-end
+ at-closing-bracket-p
+ comma-p)
+ (when (looking-at js--declaration-keyword-re)
+ (setq declaration-keyword-end (match-end 0))
+ (save-excursion
+ (goto-char bracket)
+ (setq at-closing-bracket-p
+ (condition-case nil
+ (progn
+ (forward-sexp)
+ t)
+ (error nil)))
+ (when at-closing-bracket-p
+ (while (forward-comment 1))
+ (setq comma-p (looking-at-p ","))))
+ (when comma-p
+ (goto-char (1+ declaration-keyword-end))))))))
+
(defun js--proper-indentation (parse-status)
"Return the proper indentation for the current line."
(save-excursion
(skip-syntax-backward " ")
(when (eq (char-before) ?\)) (backward-list))
(back-to-indentation)
+ (js--maybe-goto-declaration-keyword-end parse-status)
(let* ((in-switch-p (unless same-indent-p
(looking-at "\\_<switch\\_>")))
(same-indent-p (or same-indent-p
(let* ((parse-status
(save-excursion (syntax-ppss (point-at-bol))))
(offset (- (point) (save-excursion (back-to-indentation) (point)))))
- (indent-line-to (js--proper-indentation parse-status))
- (when (> offset 0) (forward-char offset))))
+ (unless (nth 3 parse-status)
+ (indent-line-to (js--proper-indentation parse-status))
+ (when (> offset 0) (forward-char offset)))))
;;; Filling
(defsubst js--js-true (value)
(not (js--js-not value)))
-;; The somewhat complex code layout confuses the byte-compiler into
-;; thinking this function "might not be defined at runtime".
-(declare-function js--optimize-arglist "js" (arglist))
-
(eval-and-compile
(defun js--optimize-arglist (arglist)
"Convert immediate js< and js! references to deferred ones."
'(when (fboundp 'folding-add-to-marks-list)
(folding-add-to-marks-list 'js-mode "// {{{" "// }}}" )))
+;;;###autoload
+(dolist (name (list "node" "nodejs" "gjs" "rhino"))
+ (add-to-list 'interpreter-mode-alist (cons (purecopy name) 'js-mode)))
+
(provide 'js)
;; js.el ends here