| blob | bae9e52bf0fb570adacff4fe68de32132f2b9fda |
1 ;;; js.el --- Major mode for editing JavaScript -*- lexical-binding: t -*-
3 ;; Copyright (C) 2008-2017 Free Software Foundation, Inc.
5 ;; Author: Karl Landstrom <karl.landstrom@brgeight.se>
6 ;; Daniel Colascione <dan.colascione@gmail.com>
7 ;; Maintainer: Daniel Colascione <dan.colascione@gmail.com>
8 ;; Version: 9
9 ;; Date: 2009-07-25
10 ;; Keywords: languages, javascript
12 ;; This file is part of GNU Emacs.
14 ;; GNU Emacs is free software: you can redistribute it and/or modify
15 ;; it under the terms of the GNU General Public License as published by
16 ;; the Free Software Foundation, either version 3 of the License, or
17 ;; (at your option) any later version.
19 ;; GNU Emacs is distributed in the hope that it will be useful,
20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 ;; GNU General Public License for more details.
24 ;; You should have received a copy of the GNU General Public License
25 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
27 ;;; Commentary
29 ;; This is based on Karl Landstrom's barebones javascript-mode. This
30 ;; is much more robust and works with cc-mode's comment filling
31 ;; (mostly).
32 ;;
33 ;; The main features of this JavaScript mode are syntactic
34 ;; highlighting (enabled with `font-lock-mode' or
35 ;; `global-font-lock-mode'), automatic indentation and filling of
36 ;; comments, C preprocessor fontification, and MozRepl integration.
37 ;;
38 ;; General Remarks:
39 ;;
40 ;; XXX: This mode assumes that block comments are not nested inside block
41 ;; XXX: comments
42 ;;
43 ;; Exported names start with "js-"; private names start with
44 ;; "js--".
46 ;;; Code:
69 ;;; Constants
91 "Regexp matching the prefix of a cpp directive.
92 This includes the directive name, or nil in languages without
93 preprocessor support. The first submatch surrounds the directive
100 Group 1 is a (possibly-dotted) class name, group 2 is a method name,
109 ;; var NewClass = BaseClass.extend(
117 ;; var NewClass = Class.create()
133 ;; var NewClass = Class.create({
140 ;; Parent class name(s) (yes, multiple inheritance in JavaScript) are
141 ;; matched with dedicated font-lock matchers
169 :prototype t
175 :prototype t
191 :prototype t
197 :prototype t
208 :prototype t
222 "List of JavaScript class definition styles.
224 A class definition style is a plist with the following keys:
226 :name is a human-readable name of the class type
228 :class-decl is a regular expression giving the start of the
229 class. Its first group must match the name of its class. If there
230 is a parent class, the second group should match, and it should be
231 the name of the class.
233 If :prototype is present and non-nil, the parser will merge
234 declarations for this constructs with others at the same lexical
235 level that have the same name. Otherwise, multiple definitions
236 will create multiple top-level entries. Don't use :prototype
237 unnecessarily: it has an associated cost in performance.
239 If :strip-prototype is present and non-nil, then if the class
240 name as matched contains
247 collect framework into available-frameworks
248 finally return available-frameworks)
254 "Regexp matching the start of a JavaScript function header.
260 "Regexp matching the start of a function entry in an associative array.
272 "Regexp matching a CPP macro definition, up to the opening parenthesis.
322 ;; js--pitem is the basic building block of the lexical
323 ;; database. When one refers to a real part of the buffer, the region
324 ;; of text to which it refers is split into a conceptual header and
325 ;; body. Consider the (very short) block described by a hypothetical
326 ;; js--pitem:
327 ;;
328 ;; function foo(a,b,c) { return 42; }
329 ;; ^ ^ ^
330 ;; | | |
331 ;; +- h-begin +- h-end +- b-end
332 ;;
333 ;; (Remember that these are buffer positions, and therefore point
334 ;; between characters, not at them. An arrow drawn to a character
335 ;; indicates the corresponding position is between that character and
336 ;; the one immediately preceding it.)
337 ;;
338 ;; The header is the region of text [h-begin, h-end], and is
339 ;; the text needed to unambiguously recognize the start of the
340 ;; construct. If the entire header is not present, the construct is
341 ;; not recognized at all. No other pitems may be nested inside the
342 ;; header.
343 ;;
344 ;; The body is the region [h-end, b-end]. It may contain nested
345 ;; js--pitem instances. The body of a pitem may be empty: in
346 ;; that case, b-end is equal to header-end.
347 ;;
348 ;; The three points obey the following relationship:
349 ;;
350 ;; h-begin < h-end <= b-end
351 ;;
352 ;; We put a text property in the buffer on the character *before*
353 ;; h-end, and if we see it, on the character *before* b-end.
354 ;;
355 ;; The text property for h-end, js--pstate, is actually a list
356 ;; of all js--pitem instances open after the marked character.
357 ;;
358 ;; The text property for b-end, js--pend, is simply the
359 ;; js--pitem that ends after the marked character. (Because
360 ;; pitems always end when the paren-depth drops below a critical
361 ;; value, and because we can only drop one level per character, only
362 ;; one pitem may end at a given character.)
363 ;;
364 ;; In the structure below, we only store h-begin and (sometimes)
365 ;; b-end. We can trivially and quickly find h-end by going to h-begin
366 ;; and searching for an js--pstate text property. Since no other
367 ;; js--pitem instances can be nested inside the header of a
368 ;; pitem, the location after the character with this text property
369 ;; must be h-end.
370 ;;
371 ;; js--pitem instances are never modified (with the exception
372 ;; of the b-end field). Instead, modified copies are added at
373 ;; subsequence parse points.
374 ;; (The exception for b-end and its caveats is described below.)
375 ;;
378 ;; IMPORTANT: Do not alter the position of fields within the list.
379 ;; Various bits of code depend on their positions, particularly
380 ;; anything that manipulates the list of children.
382 ;; List of children inside this pitem's body
385 ;; When we reach this paren depth after h-end, the pitem ends
388 ;; Symbol or class-style plist if this is a class
391 ;; See above
394 ;; List of strings giving the parts of the name of this pitem (e.g.,
395 ;; '("MyClass" "myMethod"), or t if this pitem is anonymous
398 ;; THIS FIELD IS MUTATED, and its value is shared by all copies of
399 ;; this pitem: when we copy-and-modify pitem instances, we share
400 ;; their tail structures, so all the copies actually have the same
401 ;; terminating cons cell. We modify that shared cons cell directly.
402 ;;
403 ;; The field value is either a number (buffer location) or nil if
404 ;; unknown.
405 ;;
406 ;; If the field's value is greater than `js--cache-end', the
407 ;; value is stale and must be treated as if it were nil. Conversely,
408 ;; if this field is nil, it is guaranteed that this pitem is open up
409 ;; to at least `js--cache-end'. (This property is handy when
410 ;; computing whether we're inside a given pitem.)
411 ;;
414 ;; The pitem we start parsing with.
417 :paren-depth most-negative-fixnum
420 ;;; User Customization
423 "Customization variables for JavaScript mode."
428 "Number of spaces for each indentation step in `js-mode'."
434 "Number of additional spaces for indenting continued expressions.
435 The value must be no less than minus `js-indent-level'."
441 "Number of additional spaces for indenting expressions in parentheses.
442 The value must be no less than minus `js-indent-level'."
449 "Number of additional spaces for indenting expressions in square braces.
450 The value must be no less than minus `js-indent-level'."
457 "Number of additional spaces for indenting expressions in curly braces.
458 The value must be no less than minus `js-indent-level'."
465 "Number of additional spaces for indenting the contents of a switch block.
466 The value must not be negative."
473 "Treat nested functions as top-level functions in `js-mode'.
474 This applies to function movement, marking, and so on."
479 "Lineup function for `cc-mode-style', for C comments in `js-mode'."
484 "Frameworks recognized by `js-mode'.
485 To improve performance, you may turn off some frameworks you
486 seldom use, either globally or on a per-buffer basis."
489 js--available-frameworks))
494 "Whether `js-mode' should display tabs while selecting them.
495 This is useful only if the windowing system has a good mechanism
496 for preventing Firefox from stealing the keyboard focus."
501 "~/.emacs.d/js/js"
502 "Temporary directory used by `js-mode' to communicate with Mozilla.
503 This directory must be readable and writable by both Mozilla and Emacs."
508 "Reply timeout for executing commands in Mozilla via `js-mode'.
509 The value is given in seconds. Increase this value if you are
510 getting timeout messages."
515 "Non-nil means specially indent the first variable declaration's initializer.
516 Normally, the first declaration's initializer is unindented, and
517 subsequent declarations have their identifiers aligned with it:
519 var o = {
520 foo: 3
521 };
523 var o = {
524 foo: 3
525 },
526 bar = 2;
528 If this option has the value t, indent the first declaration's
529 initializer by an additional level:
531 var o = {
532 foo: 3
533 };
535 var o = {
536 foo: 3
537 },
538 bar = 2;
540 If this option has the value `dynamic', if there is only one declaration,
541 don't indent the first one's initializer; otherwise, indent it.
543 var o = {
544 foo: 3
545 };
547 var o = {
548 foo: 3
549 },
550 bar = 2;"
562 let x = svg.mumble()
563 .chained;
564 "
570 ;;; KeyMap
586 keymap)
589 ;;; Syntax table and parsing
596 table)
627 "Helper function for `js--update-quick-match-re'.
628 If LIST contains any element that is not nil, return its non-nil
629 elements, separated by SEPARATOR, prefixed by PREFIX, and ended
630 with SUFFIX as with `concat'. Otherwise, if LIST is empty, return
631 nil. If any element in LIST is itself a list, flatten that
632 element."
638 "Internal function used by `js-mode' for caching buffer constructs.
639 This updates `js--quick-match-re', based on the current set of
640 enabled frameworks."
645 ;; #define mumble
654 ;; var mumble = THING (
675 ;; mumble.prototypeTHING
683 ;; mumble.prototype = {
690 "Move over the next value of PROPNAME in the buffer.
691 If found, return that value and leave point after the character
692 having that value; otherwise, return nil and leave point at EOB."
703 next-value))
706 "Move over the previous value of PROPNAME in the buffer.
707 If found, return that value and leave point just before the
708 character that has that value, otherwise return nil and leave
709 point at BOB."
722 prev-value)))
735 "Helper function for `js--re-search-forward'."
737 str-terminator
766 "Search forward, ignoring strings, cpp macros, and comments.
767 This function invokes `re-search-forward', but treats the buffer
768 as if strings, cpp macros, and comments have been removed.
770 If invoked while inside a macro, it treats the contents of the
771 macro as normal text."
788 "Auxiliary function for `js--re-search-backward'."
790 str-terminator
821 "Search backward, ignoring strings, preprocessor macros, and comments.
823 This function invokes `re-search-backward' but treats the buffer
824 as if strings, preprocessor macros, and comments have been
825 removed.
827 If invoked while inside a macro, treat the macro as normal text."
831 "Move forward over a whole JavaScript expression.
832 This function doesn't move over expressions continued across
833 lines."
835 ;; non-continued case; simplistic, but good enough?
848 "Move forward over a JavaScript function declaration.
849 This puts point at the `function' keyword.
851 If this is a syntactically-correct non-expression function,
852 return the name of the function, or t if the name could not be
853 determined. Otherwise, return nil."
869 name)))))
872 "Return the start of the JavaScript function prologue containing POS.
873 A function prologue is everything from start of the definition up
874 to and including the opening brace. POS defaults to point.
875 If POS is not in a function prologue, return nil."
902 "Helper function for `js-beginning-of-defun'.
903 Go to previous defun-beginning and return the parse state for it,
904 or nil if we went all the way back to bob and don't find
905 anything."
913 "Helper function for `js--beginning-of-defun-nested'.
914 If PSTATE represents a non-empty top-level defun, return the
915 top-most pitem. Otherwise, return nil."
918 with func-pitem
925 "Helper function for `js--beginning-of-defun'.
926 Return the pitem of the function we went to the beginning of."
928 ;; Look for the smallest function that encloses point...
933 and return pitem)
935 ;; ...and if that isn't found, look for the previous top-level
936 ;; defun
938 while pstate
941 and return it)))
944 "Helper function for `js-beginning-of-defun'."
950 "Value of `beginning-of-defun-function' for `js-mode'."
966 ;; If we're just past the end of a function, the user probably wants
967 ;; to go to the beginning of *that* function
981 "Flush the `js-mode' syntax cache after position BEG.
982 BEG defaults to `point-min', meaning to flush the entire cache."
988 ;; `(message ,@arguments)
989 )
998 ;; open-items must contain at least two items for this to
999 ;; work, but because we push a dummy item to start with,
1000 ;; that assumption holds.
1003 open-items)
1006 "Helper function for `js--ensure-cache'.
1007 Update parsing information up to point, referring to parse,
1008 prev-parse-point, goal-point, and open-items bound lexically in
1009 the body of `js--ensure-cache'."
1016 ;; Make sure parse-partial-sexp doesn't stop because we *entered*
1017 ;; the given depth -- i.e., make sure we're deeper than the target
1018 ;; depth.
1022 prev-parse-point goal-point
1024 nil parse))
1026 ;; (let ((overlay (make-overlay prev-parse-point (point))))
1027 ;; (overlay-put overlay 'face '(:background "red"))
1028 ;; (unwind-protect
1029 ;; (progn
1030 ;; (js--debug "parsed: %S" parse)
1031 ;; (sit-for 1))
1032 ;; (delete-overlay overlay)))
1048 "Split a JavaScript name into its dot-separated parts.
1049 This also removes any prototype parts from the split name
1061 "Guess the name of the JavaScript function at POSITION.
1063 Return the name of the function, or nil if the name could not be
1064 guessed.
1066 This function clobbers match data. If we find the preamble
1067 begins earlier than expected while guessing the function name,
1068 set `js--guess-function-name-start' to that position; otherwise,
1069 set that variable to nil."
1086 ;; Clear any endings that occur after point
1093 ;; Remove any cache properties after this point
1098 "Ensures brace cache is valid up to the character before LIMIT.
1099 LIMIT defaults to point."
1105 parse
1106 prev-parse-point
1107 name
1108 case-fold-search
1109 filtered-class-styles
1110 goal-point)
1112 ;; Figure out which class styles we need to look for
1116 js-enabled-frameworks)
1117 collect style))
1123 ;; Find last known good position
1139 ;; Make a placeholder for the top-level definition
1155 ;; Each of these conditions should return non-nil if
1156 ;; we should add a new item and leave point at the end
1157 ;; of the new item's header (h-end in the
1158 ;; js--pitem diagram). This point is the one
1159 ;; after the last character we need to unambiguously
1160 ;; detect this construct. If one of these evaluates to
1161 ;; nil, the location of the point is ignored.
1163 ;; In comment or string
1166 ;; Regular function declaration
1175 js--guess-function-name-start))
1182 :paren-depth orig-depth
1183 :h-begin orig-match-start
1186 name
1189 ;; Macro
1192 ;; Macros often contain unbalanced parentheses.
1193 ;; Make sure that h-end is at the textual end of
1194 ;; the macro no matter what the parenthesis say.
1200 :h-begin orig-match-start
1204 ;; "Prototype function" declaration
1211 :paren-depth orig-depth
1212 :h-begin orig-match-start
1218 ;; Class definition
1220 with syntactic-context =
1222 for class-style in filtered-class-styles
1228 and return
1230 :paren-depth orig-depth
1231 :h-begin orig-match-start
1232 :type class-style
1247 )))))
1250 "Helper function for `js-end-of-defun'."
1255 return t
1259 "Helper function for `js-end-of-defun'."
1268 found)
1271 ;; We're already inside a function; just go to its end.
1274 ;; Otherwise, go to the end of the next function...
1281 ;; ... or eob.
1285 "Value of `end-of-defun-function' for `js-mode'."
1296 ;; look for function backward. if we're inside it, go to that
1297 ;; function's end. otherwise, search for the next function's end and
1298 ;; go there
1302 ;; if we're doing nested functions, see whether we're in the
1303 ;; prologue. If we are, go to the end of the function; otherwise,
1304 ;; call js--end-of-defun-nested to do the real work
1325 t
1327 nil))))
1330 "Simple implementation of `c-backward-syntactic-ws' for `js-mode'."
1341 pos
1345 "Simple implementation of `c-forward-syntactic-ws' for `js-mode'."
1355 pos
1358 ;; Like (up-list -1), but only considers lists that end nearby"
1361 ;; Look at a very small region so our computation time doesn't
1362 ;; explode in pathological cases.
1367 "Return non-nil if point is in a function parameter list."
1378 "Return non-nil if point is in a Dojo multiple-inheritance class block."
1389 ;;; Font Lock
1391 "Helper function for building `js--font-lock-keywords'.
1392 Create a byte-compiled function for matching a concatenation of
1393 REGEXPS, but only if FRAMEWORK is in `js-enabled-frameworks'."
1404 "Move forward over a JavaScript destructuring spec.
1405 If FUNC is supplied, call it with no arguments before every
1406 variable name in the spec. Return true if this was actually a
1407 spec. FUNC must preserve the match data."
1419 t)
1424 t))))
1427 t))
1441 t))
1446 t)))))
1449 t))))
1452 "Font-lock matcher for variable names in a variable declaration.
1453 This is a cc-mode-style matcher that *always* fails, from the
1454 point of view of font-lock. It applies highlighting directly with
1455 `font-lock-apply-highlight'."
1467 t))
1489 ;; Conditions to handle
1493 ;; Matcher always "fails"
1494 nil)
1497 `(
1498 ;; This goes before keywords-2 so it gets used preferentially
1499 ;; instead of the keywords in keywords-2. Don't use override
1500 ;; because that will override syntactic fontification too, which
1501 ;; will fontify commented-out directives as if they weren't
1502 ;; commented out.
1505 ,@js--font-lock-keywords-2
1510 ;; Highlights class being declared, in parts
1514 nil
1517 ;; Highlights parent class, in parts, if available
1534 ;; Highlights parent class
1538 ;; Dojo needs its own matcher to override the string highlighting
1540 'dojo
1547 ;; Match Dojo base classes. Of course Mojo has to be different
1548 ;; from everything else under the sun...
1550 'dojo
1559 ;; continued Dojo base-class list
1561 'dojo
1572 ;; variable declarations
1577 ;; class instantiation
1582 ;; instanceof
1587 ;; formal parameters
1591 js--name-start-re)
1597 ;; continued formal parameter list
1611 "Return whether point is inside the given pitem's header or body."
1621 "Parse the JavaScript program state at point.
1622 Return a list of `js--pitem' instances that apply to point, most
1623 specific first. In the worst case, the current toplevel instance
1624 will be returned."
1633 ;; Loop until we either hit a pitem at BOB or pitem ends after
1634 ;; point (or at point if we're at eob)
1641 pstate))))
1644 "Return the JavaScript syntactic context corresponding to PSTATE."
1647 type)
1653 "Return the JavaScript syntactic context at point.
1654 When called interactively, also display a message with that
1655 context."
1663 syntactic-context))
1666 "Font lock function used by `js-mode'.
1667 This performs fontification according to `js--class-styles'."
1675 js-enabled-frameworks)
1678 decl-re
1681 and return t)
1682 return t
1687 js--font-lock-keywords-2
1688 js--font-lock-keywords-3)
1692 "Return syntactic face given STATE."
1694 font-lock-string-face
1698 font-lock-doc-face
1699 font-lock-comment-face)))
1703 ;; Start of regexp.
1704 "/"
1706 ;; Match characters outside of a character class.
1708 ;; Match backslash quoted characters.
1710 ;; Match character class.
1712 "["
1723 ;; A /.../ regexp.
1726 ;; Don't touch text after END.
1734 ;; JavaScript allows immediate regular expression objects, written /.../.
1739 ;; Distinguish /-division from /-regexp chars (and from /-comment-starter).
1740 ;; FIXME: Allow regexps after infix ops like + ...
1741 ;; https://developer.mozilla.org/en/JavaScript/Reference/Operators
1742 ;; We can probably just add +, -, <, >, %, ^, ~, ?, : at which
1743 ;; point I think only * and / would be missing which could also be added,
1744 ;; but need care to avoid affecting the // and */ comment markers.
1749 ;; If the / is at the beginning of line, we have to check
1750 ;; the end of the previous text.
1768 ;;; Indentation
1786 "Return non-nil if point is on a JavaScript operator, other than a comma."
1801 ;; Generator method (possibly using computed property).
1805 ;; We might misindent some expressions that would
1806 ;; return NaN anyway. Shouldn't be a problem.
1810 "Move backward to the nearest newline that is not in a block comment."
1817 ;; We match the end of a // comment but not a newline in a
1818 ;; block comment.
1821 ;; If we saw a block comment, keep trying.
1825 result))
1828 "Return non-nil if the current line continues an expression."
1847 "Skip a term before point; return t if a term was skipped."
1849 ;; Skip backward over balanced parens.
1853 ;; First skip whitespace.
1855 ;; Now if we're looking at closing paren, skip to the opener.
1856 ;; This doesn't strictly follow JS syntax, in that we might
1857 ;; skip something nonsensical like "()[]{}", but it is enough
1858 ;; if it works ok for valid input.
1862 ;; Maybe skip over a symbol.
1866 ;; Skipped.
1870 ;; Did not skip, so restore point.
1877 "Skip any number of terms backward.
1879 Returns t if successful, nil if no term was found."
1881 ;; Found at least one.
1886 t)))
1889 "A helper for js--proper-indentation that handles chained expressions.
1890 A chained expression is when the current line starts with '.' and the
1891 previous line also has a '.' expression.
1892 This function returns the indentation for the current line if it is
1893 a chained expression line; otherwise nil.
1894 This should only be called while point is at the start of the line's content,
1895 as determined by `back-to-indentation'."
1906 Otherwise, return nil. A braceless do-while statement spanning
1907 several lines requires that the start of the loop is indented to
1908 the same column as the current line."
1930 "Helper function for `js--proper-indentation'.
1931 Return the proper indentation of the current line if it starts
1932 the body of a control statement without braces; otherwise, return
1933 nil."
1962 "Helper function for `js--proper-indentation'.
1963 Return the proper indentation of the current line if it belongs to a declaration
1964 statement spanning multiple lines; otherwise, return nil."
1966 at-opening-bracket)
1993 "Return non-nil if we think we're in an array comprehension.
1994 In particular, return the buffer position of the first `for' kwd."
2011 ;; Nothing to do here.
2012 nil)))
2013 ;; To skip arbitrary expressions we need the parser,
2014 ;; so we'll just guess at it.
2017 ;; Not inside comment or string literal.
2025 ;; First continuation line.
2036 "Helper function for `js--proper-indentation'.
2037 Depending on the value of `js-indent-first-init', move
2038 point to the end of a variable declaration keyword so that
2039 indentation is aligned to that column."
2046 declaration-keyword-end
2047 at-closing-bracket-p
2048 forward-sexp-function ; Use Lisp version.
2049 comma-p)
2058 t)
2067 "Return the proper indentation for the current line."
2075 ;; Indent array comprehension continuation lines specially.
2077 beg)
2081 ;; At or after the first loop?
2088 ;; A single closing paren/bracket should be indented at the
2089 ;; same level as the opening statement. Same goes for
2090 ;; "case" and "default".
2105 in-switch-p)))
2111 js-expr-indent-offset))
2120 indent)))
2121 ;; If there is something following the opening
2122 ;; paren/bracket, everything else should be indented at
2123 ;; the same level.
2133 ;;; JSX Indentation
2136 "Find where JSX starts.
2138 Assume JSX appears in the following instances:
2139 - Inside parentheses, when returned or as the first argument
2140 to a function, and after a newline
2141 - When assigned to variables or object properties, but only
2142 on a single line
2143 - As the N+1th argument to a function
2146 nil t), except set point to the end of the match. This logic
2147 executes up to the number of lines in the file, so it should be
2148 really fast to reduce that impact."
2156 pos))
2163 "Find where JSX ends.
2164 This complements the assumption of where JSX appears from
2168 "Determine if/how the current line should be indented as JSX.
2170 Return `first' for the first JSXElement on its own line.
2171 Return `nth' for subsequent lines of the first JSXElement.
2172 Return `expression' for an embedded JS expression.
2173 Return `after' for anything after the last JSXElement.
2174 Return nil for non-JSX lines.
2176 Currently, JSX indentation supports the following styles:
2178 - Single-line elements (indented like normal JS):
2180 var element = <div></div>;
2182 - Multi-line elements (enclosed in parentheses):
2184 function () {
2185 return (
2186 <div>
2187 <div></div>
2188 </div>
2189 );
2190 }
2192 - Function arguments:
2194 React.render(
2195 <div></div>,
2196 document.querySelector('.root')
2197 );"
2200 last-pos
2201 before-tag-pos before-tag-line
2202 tag-start-pos tag-start-line
2203 tag-end-pos tag-end-line
2204 after-tag-line
2205 parens paren type)
2208 ;; Determine if we're inside a jsx element
2218 tag-start-pos)
2223 ;; A "before" line which also starts an element begins with js, so
2224 ;; indent it like js
2226 ;; Only indent the jsx lines like jsx
2229 ;; Analyze bounds if there are any
2236 tag-end-pos)
2240 ;; Ensure we're actually within the bounds of the jsx
2242 ;; An "after" line which does not end an element begins with
2243 ;; js, so indent it like js
2246 ;; Handle another case where there could be e.g. comments after
2247 ;; the element
2251 ;; They may not be any bounds (yet)
2253 ;; Check if we're inside an embedded multi-line js expression
2263 ;; Curly bracket indicates the start of an embedded expression
2265 ;; The first line of the expression is indented like sgml
2267 ;; Check if within a closing curly bracket (if any)
2268 ;; (exclusive, as the closing bracket is indented like sgml)
2276 ;; Indicate this guy will be indented specially
2279 t)
2283 ;; Indent the first jsx thing like js so we can indent future jsx things
2284 ;; like sgml relative to the first thing
2289 "Execute BODY as if in sgml-mode."
2292 parse-sexp-lookup-properties)
2296 "Indent the current line as JavaScript or SGML (whichever is farther)."
2299 ;; Don't whine about errors/warnings when we're indenting.
2300 ;; This has to be set before calling parse-partial-sexp below.
2304 ;; Don't touch multiline strings.
2311 'noindent
2312 ;; Use whichever indentation column is greater, such that the sgml
2313 ;; column is effectively a minimum
2321 "Indent the current line as JavaScript."
2331 "Indent the current line as JSX (with SGML offsets).
2332 i.e., customize JSX element indentation with `sgml-basic-offset',
2333 `sgml-attribute-offset' et al."
2341 ;; Don't treat this first thing as a continued expression (often a "<" or
2342 ;; ">" causes this misinterpretation)
2349 ;;; Filling
2353 ;; FIXME: Such redefinitions are bad style. We should try and use some other
2354 ;; way to get the same result.
2358 ad-do-it))
2363 ad-do-it))
2368 ad-do-it))
2371 "Fill the paragraph with `c-fill-paragraph'."
2377 ;;; Type database and Imenu
2379 ;; We maintain a cache of semantic information, i.e., the classes and
2380 ;; functions we've encountered so far. In order to avoid having to
2381 ;; re-parse the buffer on every change, we cache the parse state at
2382 ;; each interesting point in the buffer. Each parse state is a
2383 ;; modified copy of the previous one, or in the case of the first
2384 ;; parse state, the empty state.
2385 ;;
2386 ;; The parse state itself is just a stack of js--pitem
2387 ;; instances. It starts off containing one element that is never
2388 ;; closed, that is initially js--initial-pitem.
2389 ;;
2397 name
2399 type
2403 "Helper function for `js--splice-into-items'.
2404 Return a new item that is the result of merging CHILD into
2405 ITEM. NAME-PARTS is a list of parts of the name of CHILD
2406 that we haven't consumed yet."
2411 ;; If the item we're merging into isn't a class, make it into one
2417 ;; Use the child's class-style if it's available
2419 js--dummy-class-style
2424 ;; Now we can merge either a function or a class into a class
2428 ;; if we have more name-parts to go before we get to the
2429 ;; bottom of the class hierarchy, call the merger
2430 ;; recursively
2436 ;; Not merging a class, but something else, so just prepend
2437 ;; it
2441 ;; Otherwise, merge the new child's items into those
2442 ;; of the new class
2448 "Last part of the name of PITEM, as a string or symbol."
2452 name)))
2455 "Splice CHILD into the `js--pitem' ITEMS at NAME-PARTS.
2456 If a class doesn't exist in the tree, create it. Return
2457 the new items list. NAME-PARTS is a list of strings given
2458 the broken-down class name of the item to insert."
2462 new-items last-new-item new-cons)
2465 name-parts
2471 ;; If top-name isn't found in items, then we build a copy of items
2472 ;; and throw it away. But that's okay, since most of the time, we
2473 ;; *will* find an instance.
2477 ;; Okay, we found an entry with the right name. Splice
2478 ;; the merged item into the list...
2481 name-parts)
2488 ;; ...and terminate the loop
2489 nil)
2492 ;; Otherwise, copy the current cons and move onto the
2493 ;; text. This is tricky; we keep track of the tail of
2494 ;; the list that begins with new-items in
2495 ;; last-new-item.
2502 ;; Go to the next cell in items
2506 ;; Yay! We stopped because we found something, not because
2507 ;; we ran out of items to search. Just return the new
2508 ;; list.
2511 new-items)
2513 ;; We didn't find anything. If the child is a class and we don't
2514 ;; have any classes to drill down into, just push that class;
2515 ;; otherwise, make a fake class and carry on.
2518 ;; We have name-parts left to process. Make a fake
2519 ;; class for this particular part...
2521 ;; ...and recursively digest the rest of the name
2524 :type js--dummy-class-style
2527 ;; Otherwise, this is the only name we have, so stick
2528 ;; the item on the front of the list
2529 child)
2530 items))))
2533 "Copy `js--pitem' PITEM, and push CHILD onto its list of children."
2538 t))
2540 ;; This trick works because we know (based on our defstructs) that
2541 ;; the child list is always the first element, and so the second
2542 ;; element and beyond can be shared when we make our "copy".
2549 ;; Use slow path because we need class lookup
2555 ;; Use slow path because we need class merging. We know
2556 ;; name is a list here because down in
2557 ;; `js--ensure-cache', we made sure to only add
2558 ;; class entries with lists for :name
2563 ;; Fast path
2569 "Return a marker for LOCATION if `imenu-use-markers' is non-nil."
2572 location))
2575 "Convert PITEMS, a list of `js--pitem' structures, to imenu format."
2592 imenu-items))
2597 unknown-ctr))
2600 imenu-items))
2609 imenu-items))))
2613 imenu-items))
2616 "Return an imenu index for the current buffer."
2628 ;; Make sure everything is closed
2636 ;; Convert the new-finalized state into what imenu expects
2639 unknown-ctr))))))
2641 ;; Silence the compiler.
2652 symbols)
2653 else
2664 "Return a hash table of all JavaScript symbols.
2665 This searches all existing `js-mode' buffers. Each key is the
2666 name of a symbol (possibly disambiguated with <N>, where N > 1),
2667 and each value is a marker giving the location of that symbol."
2669 with imenu-use-markers = t
2670 for buffer being the buffers
2675 finally return symbols))
2681 "Helper function for `js-find-symbol'.
2682 Read a symbol from SYMBOLS-TABLE, which is a hash table like the
2683 one from `js--get-all-known-symbols', using prompt PROMPT and
2684 initial input INITIAL-INPUT. Return a cons of (SYMBOL-NAME
2685 . LOCATION), where SYMBOL-NAME is a string and LOCATION is a
2686 marker."
2692 prompt
2694 collect key)
2710 ;; etags loads ring.
2714 "Read a JavaScript symbol and jump to it.
2715 With a prefix argument, restrict symbols to those from the
2716 current buffer. Pushes a mark onto the tag ring just like
2717 `find-tag'."
2728 symbols "Jump to: "
2736 ;;; MozRepl integration
2743 "Wait TIMEOUT seconds for PROCESS to output a match for REGEXP.
2744 On timeout, return nil. On success, return t with match data
2745 set. If START is non-nil, look for output starting from START.
2746 Otherwise, use the current value of `process-mark'."
2758 'js-moz-bad-rpc
2762 ;; Integer, mirrors the value we see in JS
2765 ;; Process to which this thing belongs
2786 ; */" Make Emacs happy
2787 "(function(repl) {
2788 repl.defineInteractor('js', {
2789 onStart: function onStart(repl) {
2790 if(!repl._jsObjects) {
2791 repl._jsObjects = {};
2792 repl._jsLastID = 0;
2793 repl._jsGC = this._jsGC;
2794 }
2795 this._input = '';
2796 },
2798 _jsGC: function _jsGC(ids_in_use) {
2799 var objects = this._jsObjects;
2800 var keys = [];
2801 var num_freed = 0;
2803 for(var pn in objects) {
2804 keys.push(Number(pn));
2805 }
2807 keys.sort(function(x, y) x - y);
2808 ids_in_use.sort(function(x, y) x - y);
2809 var i = 0;
2810 var j = 0;
2812 while(i < ids_in_use.length && j < keys.length) {
2813 var id = ids_in_use[i++];
2814 while(j < keys.length && keys[j] !== id) {
2815 var k_id = keys[j++];
2816 delete objects[k_id];
2817 ++num_freed;
2818 }
2819 ++j;
2820 }
2822 while(j < keys.length) {
2823 var k_id = keys[j++];
2824 delete objects[k_id];
2825 ++num_freed;
2826 }
2828 return num_freed;
2829 },
2831 _mkArray: function _mkArray() {
2832 var result = [];
2833 for(var i = 0; i < arguments.length; ++i) {
2834 result.push(arguments[i]);
2835 }
2836 return result;
2837 },
2839 _parsePropDescriptor: function _parsePropDescriptor(parts) {
2840 if(typeof parts === 'string') {
2841 parts = [ parts ];
2842 }
2844 var obj = parts[0];
2845 var start = 1;
2847 if(typeof obj === 'string') {
2848 obj = window;
2849 start = 0;
2850 } else if(parts.length < 2) {
2851 throw new Error('expected at least 2 arguments');
2852 }
2854 for(var i = start; i < parts.length - 1; ++i) {
2855 obj = obj[parts[i]];
2856 }
2858 return [obj, parts[parts.length - 1]];
2859 },
2861 _getProp: function _getProp(/*...*/) {
2862 if(arguments.length === 0) {
2863 throw new Error('no arguments supplied to getprop');
2864 }
2866 if(arguments.length === 1 &&
2867 (typeof arguments[0]) !== 'string')
2868 {
2869 return arguments[0];
2870 }
2872 var [obj, propname] = this._parsePropDescriptor(arguments);
2873 return obj[propname];
2874 },
2876 _putProp: function _putProp(properties, value) {
2877 var [obj, propname] = this._parsePropDescriptor(properties);
2878 obj[propname] = value;
2879 },
2881 _delProp: function _delProp(propname) {
2882 var [obj, propname] = this._parsePropDescriptor(arguments);
2883 delete obj[propname];
2884 },
2886 _typeOf: function _typeOf(thing) {
2887 return typeof thing;
2888 },
2890 _callNew: function(constructor) {
2891 if(typeof constructor === 'string')
2892 {
2893 constructor = window[constructor];
2894 } else if(constructor.length === 1 &&
2895 typeof constructor[0] !== 'string')
2896 {
2897 constructor = constructor[0];
2898 } else {
2899 var [obj,propname] = this._parsePropDescriptor(constructor);
2900 constructor = obj[propname];
2901 }
2903 /* Hacky, but should be robust */
2904 var s = 'new constructor(';
2905 for(var i = 1; i < arguments.length; ++i) {
2906 if(i != 1) {
2907 s += ',';
2908 }
2910 s += 'arguments[' + i + ']';
2911 }
2913 s += ')';
2914 return eval(s);
2915 },
2917 _callEval: function(thisobj, js) {
2918 return eval.call(thisobj, js);
2919 },
2921 getPrompt: function getPrompt(repl) {
2922 return 'EVAL>'
2923 },
2925 _lookupObject: function _lookupObject(repl, id) {
2926 if(typeof id === 'string') {
2927 switch(id) {
2928 case 'global':
2929 return window;
2930 case 'nil':
2931 return null;
2932 case 't':
2933 return true;
2934 case 'false':
2935 return false;
2936 case 'undefined':
2937 return undefined;
2938 case 'repl':
2939 return repl;
2940 case 'interactor':
2941 return this;
2942 case 'NaN':
2943 return NaN;
2944 case 'Infinity':
2945 return Infinity;
2946 case '-Infinity':
2947 return -Infinity;
2948 default:
2949 throw new Error('No object with special id:' + id);
2950 }
2951 }
2953 var ret = repl._jsObjects[id];
2954 if(ret === undefined) {
2955 throw new Error('No object with id:' + id + '(' + typeof id + ')');
2956 }
2957 return ret;
2958 },
2960 _findOrAllocateObject: function _findOrAllocateObject(repl, value) {
2961 if(typeof value !== 'object' && typeof value !== 'function') {
2962 throw new Error('_findOrAllocateObject called on non-object('
2963 + typeof(value) + '): '
2964 + value)
2965 }
2967 for(var id in repl._jsObjects) {
2968 id = Number(id);
2969 var obj = repl._jsObjects[id];
2970 if(obj === value) {
2971 return id;
2972 }
2973 }
2975 var id = ++repl._jsLastID;
2976 repl._jsObjects[id] = value;
2977 return id;
2978 },
2980 _fixupList: function _fixupList(repl, list) {
2981 for(var i = 0; i < list.length; ++i) {
2982 if(list[i] instanceof Array) {
2983 this._fixupList(repl, list[i]);
2984 } else if(typeof list[i] === 'object') {
2985 var obj = list[i];
2986 if(obj.funcall) {
2987 var parts = obj.funcall;
2988 this._fixupList(repl, parts);
2989 var [thisobj, func] = this._parseFunc(parts[0]);
2990 list[i] = func.apply(thisobj, parts.slice(1));
2991 } else if(obj.objid) {
2992 list[i] = this._lookupObject(repl, obj.objid);
2993 } else {
2994 throw new Error('Unknown object type: ' + obj.toSource());
2995 }
2996 }
2997 }
2998 },
3000 _parseFunc: function(func) {
3001 var thisobj = null;
3003 if(typeof func === 'string') {
3004 func = window[func];
3005 } else if(func instanceof Array) {
3006 if(func.length === 1 && typeof func[0] !== 'string') {
3007 func = func[0];
3008 } else {
3009 [thisobj, func] = this._parsePropDescriptor(func);
3010 func = thisobj[func];
3011 }
3012 }
3014 return [thisobj,func];
3015 },
3017 _encodeReturn: function(value, array_as_mv) {
3018 var ret;
3020 if(value === null) {
3021 ret = ['special', 'null'];
3022 } else if(value === true) {
3023 ret = ['special', 'true'];
3024 } else if(value === false) {
3025 ret = ['special', 'false'];
3026 } else if(value === undefined) {
3027 ret = ['special', 'undefined'];
3028 } else if(typeof value === 'number') {
3029 if(isNaN(value)) {
3030 ret = ['special', 'NaN'];
3031 } else if(value === Infinity) {
3032 ret = ['special', 'Infinity'];
3033 } else if(value === -Infinity) {
3034 ret = ['special', '-Infinity'];
3035 } else {
3036 ret = ['atom', value];
3037 }
3038 } else if(typeof value === 'string') {
3039 ret = ['atom', value];
3040 } else if(array_as_mv && value instanceof Array) {
3041 ret = ['array', value.map(this._encodeReturn, this)];
3042 } else {
3043 ret = ['objid', this._findOrAllocateObject(repl, value)];
3044 }
3046 return ret;
3047 },
3049 _handleInputLine: function _handleInputLine(repl, line) {
3050 var ret;
3051 var array_as_mv = false;
3053 try {
3054 if(line[0] === '*') {
3055 array_as_mv = true;
3056 line = line.substring(1);
3057 }
3058 var parts = eval(line);
3059 this._fixupList(repl, parts);
3060 var [thisobj, func] = this._parseFunc(parts[0]);
3061 ret = this._encodeReturn(
3062 func.apply(thisobj, parts.slice(1)),
3063 array_as_mv);
3064 } catch(x) {
3065 ret = ['error', x.toString() ];
3066 }
3068 var JSON = Components.classes['@mozilla.org/dom/json;1'].createInstance(Components.interfaces.nsIJSON);
3069 repl.print(JSON.encode(ret));
3070 repl._prompt();
3071 },
3073 handleInput: function handleInput(repl, chunk) {
3074 this._input += chunk;
3075 var match, line;
3077 line = match[0];
3080 repl.popInteractor();
3081 repl._prompt();
3082 return;
3083 }
3085 this._input = this._input.substring(line.length);
3086 this._handleInputLine(repl, line);
3087 }
3088 }
3089 });
3090 })
3096 "Marshall the given value for JS.
3097 Strings and numbers are JSON-encoded. Lists (including nil) are
3098 made into JavaScript array literals and their contents encoded
3099 with `js--js-encode-value'."
3126 js--js-repl-prompt-regexp js-js-timeout
3128 ;; start matching against the beginning of the line in
3129 ;; order to catch a prompt that's only partially arrived
3132 ;; Presumably "inferior-moz-process" loads comint.
3142 ;; Do some initialization the first time we see a process
3148 ;; Send interactor definition
3154 js-js-timeout))
3156 ;; Sanity check
3162 ;; If js--js-repl-depth > 0, we *should* be seeing an
3163 ;; EVAL> prompt. If we don't, give Mozilla a chance to catch
3164 ;; up with us.
3167 ;; Otherwise, tell Mozilla to enter the interactor mode
3173 js-js-timeout))
3187 js-js-timeout))))
3197 "Convert immediate js< and js! references to deferred ones."
3221 function))
3223 else
3224 collect item)))
3239 "Run FORMS with the Mozilla repl set up for js commands.
3240 Inside the lexical scope of `with-js', `js?', `js!',
3241 `js-new', `js-eval', `js-list', `js<', `js>', `js-get-service',
3242 `js-create-instance', and `js-qi' are defined."
3253 function)
3261 function)
3293 props)
3295 ))
3301 "Whether to listify any Array returned by a Mozilla function.
3308 (`array
3310 (`objid
3312 js--js-references)
3317 js--js-references)))
3325 "Call the Mozilla function FUNCTION with arguments ARGUMENTS.
3326 If function is a string, look it up as a property on the global
3327 object and use the global object for `this'.
3328 If FUNCTION is a list with one element, use that element as the
3329 function with the global object for `this', except that if that
3330 single element is a string, look it up on the global object.
3331 If FUNCTION is a list with more than one argument, use the list
3332 up to the last value as a property descriptor and the last
3333 argument as a function."
3340 ;; Actual funcall
3347 js-js-timeout)
3350 ;; Read the result
3357 "Call CONSTRUCTOR as a constructor, with arguments ARGUMENTS.
3358 CONSTRUCTOR is a JS handle, a string, or a list of these things."
3361 constructor arguments))
3367 "Return a Lisp array resulting from evaluating each of ARGUMENTS."
3370 arguments)))
3379 "Tell the repl about any objects we don't reference anymore.
3380 With argument, run even if no intervening GC has happened."
3391 ;; Don't bother running unless we've had an intervening
3392 ;; garbage collection; without a gc, nothing is deleted
3393 ;; from the weak hash table, so it's pointless telling
3394 ;; MozRepl about that references we still hold
3397 ;; Are we looking at a normal prompt? Make sure not to
3398 ;; interrupt the user if he's doing something
3406 of js--js-references
3407 collect x))
3414 num)))
3419 "Evaluate the JavaScript in JS and return JSON-decoded result."
3427 result)))
3430 "Enumerate all JavaScript contexts available.
3431 Each context is a list:
3432 (TITLE URL BROWSER TAB TABBROWSER) for content documents
3433 (TITLE URL WINDOW) for windows
3435 All tabs of a given window are grouped together. The most recent
3436 window is first. Within each window, the tabs are returned
3437 left-to-right."
3442 "@mozilla.org/appshell/window-mediator;1"
3468 "browsers"
3469 x
3470 "contentDocument"
3474 "browsers"
3475 x
3476 "contentWindow"
3477 "location"
3480 "browsers"
3481 x)
3484 "tabContainer"
3485 "childNodes"
3487 x)
3489 gbrowser))))))
3496 "Read a Mozilla tab with prompt PROMPT.
3497 Return a cons of (TYPE . OBJECT). TYPE is either `window' or
3498 `tab', and OBJECT is a JavaScript handle to a ChromeWindow or a
3499 browser, respectively."
3501 ;; Prime IDO
3508 selected-tab prev-hitab)
3510 ;; Disambiguate names
3513 for tab in tabs
3531 ;; Hack to reduce the number of
3532 ;; round-trips to mozilla
3535 ;; Highlighting tab
3538 "style"
3540 cmds)
3542 ;; Highlight window proper
3545 "style"
3547 cmds)
3549 ;; Select tab, when appropriate
3553 cmds)))
3555 ;; Highlighting whole window
3559 "style"
3562 cmds)))
3565 ;; Unhighlighting tab
3568 cmds)
3570 cmds))
3572 ;; Unhighlighting window
3577 cmds)))
3583 ()
3589 ()
3590 ;; Fiddle with the match list a bit: if our first match
3591 ;; is a tabbrowser window, rotate the match list until
3592 ;; the active tab comes up
3598 "document"
3599 "documentElement"
3604 "gBrowser"
3607 for match in ido-matches
3612 and return t)))
3618 ;; FIXME: Don't impose IDO on the user.
3623 prompt
3625 nil t nil
3642 "Helper function for `js-eval-defun'.
3643 Return a list (NAME . CLASSPARTS), where CLASSPARTS is a list of
3644 strings making up the class name and NAME is the name of the
3645 function part."
3664 "The current JavaScript context.
3665 This is a cons like the one returned from `js--read-tab'.
3669 "(function(func_info,func) {
3670 func_info.unshift('window');
3671 var obj = window;
3672 for(var i = 1; i < func_info.length - 1; ++i) {
3673 var next = obj[func_info[i]];
3674 if(typeof next !== 'object' && typeof next !== 'function') {
3675 next = obj.prototype && obj.prototype[func_info[i]];
3676 if(typeof next !== 'object' && typeof next !== 'function') {
3677 alert('Could not find ' + func_info.slice(0, i+1).join('.') +
3678 ' or ' + func_info.slice(0, i+1).join('.') + '.prototype');
3679 return;
3680 }
3682 func_info.splice(i+1, 0, 'prototype');
3683 ++i;
3684 }
3685 }
3687 obj[func_info[i]] = func;
3688 alert('Successfully updated '+func_info.join('.'));
3692 "Set the JavaScript context to CONTEXT.
3693 When called interactively, prompt for CONTEXT."
3698 "Return a valid JavaScript context.
3699 If one hasn't been set, or if it's stale, prompt for a new one."
3709 js--js-context))
3724 file)))
3737 "Update a Mozilla tab using the JavaScript defun at point."
3740 ;; This function works by generating a temporary file that contains
3741 ;; the function we'd like to insert. We then use the elisp-js bridge
3742 ;; to command mozilla to load this file by inserting a script tag
3743 ;; into the document we set. This way, debuggers and such will have
3744 ;; a way to find the source of the just-inserted function.
3745 ;;
3746 ;; We delete the temporary file if there's an error, but otherwise
3747 ;; we add an unload event listener on the Mozilla side to delete the
3748 ;; file.
3779 ;; (Re)register a Mozilla resource URL to point to the
3780 ;; temporary directory
3798 ;; Give Mozilla responsibility for deleting this file
3803 ;; Regular content
3807 ;; Chrome
3829 ))
3831 ;; temp-name is set to nil on success
3835 ;;; Main Function
3837 ;;;###autoload
3839 "Major mode for editing JavaScript."
3848 . js-font-lock-syntactic-face-function)))
3856 ;; Comments
3861 ;; Parse cache
3864 ;; Frameworks
3867 ;; Imenu
3871 ;; for filling, pretend we're cc-mode
3874 c-paragraph-separate "$"
3875 c-block-comment-prefix "* "
3876 c-line-comment-starter "//"
3889 ;; FIXME: These are normally set by `c-basic-common-init'. Should
3890 ;; we call it instead? (Bug#6071)
3898 ;; Important to fontify the whole buffer syntactically! If we don't,
3899 ;; then we might have regular expression literals that aren't marked
3900 ;; as strings, which will screw up parse-partial-sexp, scan-lists,
3901 ;; etc. and produce maddening "unbalanced parenthesis" errors.
3902 ;; When we attempt to find the error and scroll to the portion of
3903 ;; the buffer containing the problem, JIT-lock will apply the
3904 ;; correct syntax to the regular expression literal and the problem
3905 ;; will mysteriously disappear.
3906 ;; FIXME: We should instead do this fontification lazily by adding
3907 ;; calls to syntax-propertize wherever it's really needed.
3908 ;;(syntax-propertize (point-max))
3909 )
3911 ;;;###autoload
3913 "Major mode for editing JSX.
3915 To customize the indentation for this mode, set the SGML offset
3916 variables (`sgml-basic-offset', `sgml-attribute-offset' et al.)
3917 locally, like so:
3919 (defun set-jsx-indentation ()
3920 (setq-local sgml-basic-offset js-indent-level))
3925 ;;;###autoload (defalias 'javascript-mode 'js-mode)
3931 ;;;###autoload
3937 ;; js.el ends here