(require 'sgml-mode)
(defvar js2-language-version)
(declare-function js2-backward-sws "js2-mode")
(declare-function js2-forward-sws "js2-mode")
(declare-function js2-same-line "js2-mode")
(defcustom js2-basic-offset (if (and (boundp 'c-basic-offset)
(numberp c-basic-offset))
c-basic-offset
4)
"Number of spaces to indent nested statements.
Similar to `c-basic-offset'."
:group 'js2-mode
:safe 'integerp
:type 'integer)
(defcustom js2-pretty-multiline-declarations t
"Non-nil to line up multiline declarations vertically:
var a = 10,
b = 20,
c = 30;
If the value is t, and the first assigned value in the
declaration is a function/array/object literal spanning several
lines, it won't be indented additionally:
var o = { var bar = 2,
foo: 3 vs. o = {
}, foo: 3
bar = 2; };
If the value is `all', it will always be indented additionally:
var o = {
foo: 3
};
var o = {
foo: 3
},
bar = 2;
If the value is `dynamic', it will be indented additionally only
if the declaration contains more than one variable:
var o = {
foo: 3
};
var o = {
foo: 3
},
bar = 2;"
:group 'js2-mode
:safe 'symbolp
:type 'symbol)
(defcustom js2-indent-switch-body nil
"When nil, case labels are indented on the same level as the
containing switch statement. Otherwise, all lines inside
switch statement body are indented one additional level."
:type 'boolean
:safe 'booleanp
:group 'js2-mode)
(defconst js2-possibly-braceless-keywords-re
(concat "else[ \t]+if\\|for[ \t]+each\\|"
(regexp-opt '("catch" "do" "else" "finally" "for" "if"
"try" "while" "with" "let")))
"Regular expression matching keywords that are optionally
followed by an opening brace.")
(defconst js2-indent-operator-re
(concat "[-+*/%<>&^|?:.]\\([^-+*/.]\\|$\\)\\|!?=\\|"
(regexp-opt '("in" "instanceof") 'symbols))
"Regular expression matching operators that affect indentation
of continued expressions.")
(defconst js2-declaration-keyword-re
(regexp-opt '("var" "let" "const") 'symbols)
"Regular expression matching variable declaration keywords.")
(defun js2-re-search-forward-inner (regexp &optional bound count)
"Auxiliary function for `js2-re-search-forward'."
(let (parse saved-point)
(while (> count 0)
(re-search-forward regexp bound)
(setq parse (if saved-point
(parse-partial-sexp saved-point (point))
(syntax-ppss (point))))
(cond ((nth 3 parse)
(re-search-forward
(concat "\\(\\=\\|[^\\]\\|^\\)" (string (nth 3 parse)))
(save-excursion (end-of-line) (point)) t))
((nth 7 parse)
(forward-line))
((or (nth 4 parse)
(and (eq (char-before) ?\/) (eq (char-after) ?\*)))
(re-search-forward "\\*/"))
(t
(setq count (1- count))))
(setq saved-point (point))))
(point))
(defun js2-re-search-forward (regexp &optional bound noerror count)
"Search forward but ignore strings and comments.
Invokes `re-search-forward' but treats the buffer as if strings
and comments have been removed."
(let ((saved-point (point)))
(condition-case err
(cond ((null count)
(js2-re-search-forward-inner regexp bound 1))
((< count 0)
(js2-re-search-backward-inner regexp bound (- count)))
((> count 0)
(js2-re-search-forward-inner regexp bound count)))
(search-failed
(goto-char saved-point)
(unless noerror
(error (error-message-string err)))))))
(defun js2-re-search-backward-inner (regexp &optional bound count)
"Auxiliary function for `js2-re-search-backward'."
(let (parse)
(while (> count 0)
(re-search-backward regexp bound)
(setq parse (syntax-ppss (point)))
(cond ((nth 3 parse)
(re-search-backward
(concat "\\([^\\]\\|^\\)" (string (nth 3 parse)))
(line-beginning-position) t))
((nth 7 parse)
(goto-char (nth 8 parse)))
((or (nth 4 parse)
(and (eq (char-before) ?/) (eq (char-after) ?*)))
(re-search-backward "/\\*"))
(t
(setq count (1- count))))))
(point))
(defun js2-re-search-backward (regexp &optional bound noerror count)
"Search backward but ignore strings and comments.
Invokes `re-search-backward' but treats the buffer as if strings
and comments have been removed."
(let ((saved-point (point)))
(condition-case err
(cond ((null count)
(js2-re-search-backward-inner regexp bound 1))
((< count 0)
(js2-re-search-forward-inner regexp bound (- count)))
((> count 0)
(js2-re-search-backward-inner regexp bound count)))
(search-failed
(goto-char saved-point)
(unless noerror
(error (error-message-string err)))))))
(defun js2-looking-at-operator-p ()
"Return non-nil if text after point is a non-comma operator."
(defvar js2-mode-identifier-re)
(and (looking-at js2-indent-operator-re)
(or (not (eq (char-after) ?:))
(save-excursion
(and (js2-re-search-backward "[?:{]\\|\\_<case\\_>" nil t)
(eq (char-after) ??))))
(not (and
(eq (char-after) ?/)
(save-excursion
(eq (nth 3 (syntax-ppss)) ?/))))
(not (and
(eq (char-after) ?*)
(looking-at (concat "\\* *\\(?:\\[\\|"
js2-mode-identifier-re
" *(\\)"))
(save-excursion
(js2-backward-sws)
(memq (char-before) '(?, ?} ?{)))))))
(defun js2-continued-expression-p ()
"Return non-nil if the current line continues an expression."
(save-excursion
(back-to-indentation)
(if (js2-looking-at-operator-p)
(or (not (memq (char-after) '(?- ?+)))
(progn
(forward-comment (- (point)))
(not (memq (char-before) '(?, ?\[ ?\()))))
(forward-comment (- (point)))
(or (bobp) (backward-char))
(when (js2-looking-at-operator-p)
(backward-char)
(not (looking-at "\\*\\|\\+\\+\\|--\\|/[/*]"))))))
(defun js2-end-of-do-while-loop-p ()
"Return non-nil if word after point is `while' of a do-while
statement, else returns nil. A braceless do-while statement
spanning several lines requires that the start of the loop is
indented to the same column as the current line."
(interactive)
(save-excursion
(when (looking-at "\\s-*\\_<while\\_>")
(if (save-excursion
(skip-chars-backward "[ \t\n]*}")
(looking-at "[ \t\n]*}"))
(save-excursion
(backward-list) (backward-word 1) (looking-at "\\_<do\\_>"))
(js2-re-search-backward "\\_<do\\_>" (point-at-bol) t)
(or (looking-at "\\_<do\\_>")
(let ((saved-indent (current-indentation)))
(while (and (js2-re-search-backward "^[ \t]*\\_<" nil t)
(/= (current-indentation) saved-indent)))
(and (looking-at "[ \t]*\\_<do\\_>")
(not (js2-re-search-forward
"\\_<while\\_>" (point-at-eol) t))
(= (current-indentation) saved-indent))))))))
(defun js2-multiline-decl-indentation ()
"Return the declaration indentation column if the current line belongs
to a multiline declaration statement. See `js2-pretty-multiline-declarations'."
(let (forward-sexp-function at-opening-bracket)
(save-excursion
(back-to-indentation)
(when (not (looking-at js2-declaration-keyword-re))
(when (looking-at js2-indent-operator-re)
(goto-char (match-end 0))) (while (and (not at-opening-bracket)
(not (bobp))
(let ((pos (point)))
(save-excursion
(js2-backward-sws)
(or (eq (char-before) ?,)
(and (not (eq (char-before) ?\ (prog2 (skip-syntax-backward ".")
(looking-at js2-indent-operator-re)
(js2-backward-sws))
(not (eq (char-before) ?\ (js2-same-line pos)))))
(condition-case _
(backward-sexp)
(scan-error (setq at-opening-bracket t))))
(when (looking-at js2-declaration-keyword-re)
(goto-char (match-end 0))
(1+ (current-column)))))))
(defun js2-ctrl-statement-indentation ()
"Return the proper indentation of current line if it is a control statement.
Returns an indentation if this line starts the body of a control
statement without braces, else returns nil."
(let (forward-sexp-function)
(save-excursion
(back-to-indentation)
(when (and (not (js2-same-line (point-min)))
(not (looking-at "{"))
(js2-re-search-backward "[[:graph:]]" nil t)
(not (looking-at "[{([]"))
(progn
(forward-char)
(when (= (char-before) ?\))
(ignore-errors (backward-sexp))
(skip-chars-backward " \t" (point-at-bol)))
(let ((pt (point)))
(back-to-indentation)
(when (looking-at "}[ \t]*")
(goto-char (match-end 0)))
(and (looking-at js2-possibly-braceless-keywords-re)
(= (match-end 0) pt)
(not (js2-end-of-do-while-loop-p))))))
(+ (current-indentation) js2-basic-offset)))))
(defun js2-indent-in-array-comp (parse-status)
"Return non-nil if we think we're in an array comprehension.
In particular, return the buffer position of the first `for' kwd."
(let ((bracket (nth 1 parse-status))
(end (point)))
(when bracket
(save-excursion
(goto-char bracket)
(when (looking-at "\\[")
(forward-char 1)
(js2-forward-sws)
(if (looking-at "[[{]")
(let (forward-sexp-function) (forward-sexp) (js2-forward-sws)
(if (and (/= (char-after) ?,) (looking-at "for"))
(match-beginning 0)))
(if (and (> end (point)) (re-search-forward "[^,]]* \\(for\\) " end t)
(let ((state (parse-partial-sexp bracket (point))))
(and (= 1 (car state))
(not (nth 8 state)))))
(match-beginning 1))))))))
(defun js2-array-comp-indentation (parse-status for-kwd)
(if (js2-same-line for-kwd)
(save-excursion
(goto-char (nth 1 parse-status))
(forward-char 1)
(skip-chars-forward " \t")
(current-column))
(save-excursion
(goto-char for-kwd)
(current-column))))
(defun js2-maybe-goto-declaration-keyword-end (bracket)
"Helper function for `js2-proper-indentation'.
Depending on the value of `js2-pretty-multiline-declarations',
move point to the end of a variable declaration keyword so that
indentation is aligned to that column."
(cond
((eq js2-pretty-multiline-declarations 'all)
(when (looking-at js2-declaration-keyword-re)
(goto-char (1+ (match-end 0)))))
((eq js2-pretty-multiline-declarations 'dynamic)
(let (declaration-keyword-end
at-closing-bracket-p
comma-p)
(when (looking-at js2-declaration-keyword-re)
(setq declaration-keyword-end (match-end 0))
(save-excursion
(goto-char bracket)
(setq at-closing-bracket-p
(condition-case nil
(progn
(let (forward-sexp-function)
(forward-sexp))
t)
(error nil)))
(when at-closing-bracket-p
(js2-forward-sws)
(setq comma-p (looking-at-p ","))))
(when comma-p
(goto-char (1+ declaration-keyword-end))))))))
(cl-defun js2-proper-indentation (parse-status)
"Return the proper indentation for the current line."
(save-excursion
(back-to-indentation)
(when (nth 4 parse-status)
(cl-return-from js2-proper-indentation (js2--comment-indent parse-status)))
(let* ((at-closing-bracket (looking-at "[]})]"))
(same-indent-p (or at-closing-bracket
(looking-at "\\_<case\\_>[^:]")
(and (looking-at "\\_<default:")
(save-excursion
(js2-backward-sws)
(not (memq (char-before) '(?, ?{)))))))
(continued-expr-p (js2-continued-expression-p))
(declaration-indent (and js2-pretty-multiline-declarations
(js2-multiline-decl-indentation)))
(bracket (nth 1 parse-status))
beg indent)
(cond
((and bracket
(>= js2-language-version 170)
(not (js2-same-line bracket))
(setq beg (js2-indent-in-array-comp parse-status))
(>= (point) (save-excursion
(goto-char beg)
(point-at-bol)))) (js2-array-comp-indentation parse-status beg))
((js2-ctrl-statement-indentation))
((and declaration-indent continued-expr-p)
(+ declaration-indent js2-basic-offset))
(declaration-indent)
(bracket
(goto-char bracket)
(cond
((looking-at "[({[][ \t]*\\(/[/*]\\|$\\)")
(when (save-excursion (skip-chars-backward " \t\n)")
(looking-at ")"))
(backward-list))
(back-to-indentation)
(js2-maybe-goto-declaration-keyword-end bracket)
(setq indent
(cond (same-indent-p
(current-column))
(continued-expr-p
(+ (current-column) (* 2 js2-basic-offset)))
(t
(+ (current-column) js2-basic-offset))))
(if (and js2-indent-switch-body
(not at-closing-bracket)
(looking-at "\\_<switch\\_>"))
(+ indent js2-basic-offset)
indent))
(t
(unless same-indent-p
(forward-char)
(skip-chars-forward " \t"))
(current-column))))
(continued-expr-p js2-basic-offset)
(t 0)))))
(defun js2--comment-indent (parse-status)
"Indentation inside a multi-line block comment continuation line."
(save-excursion
(goto-char (nth 8 parse-status))
(if (looking-at "/\\*")
(+ 1 (current-column))
0)))
(defun js2-indent-line (&optional _bounce-backwards)
"Indent the current line as JavaScript source text."
(interactive)
(let (parse-status offset
(inhibit-point-motion-hooks t))
(setq parse-status (save-excursion
(syntax-ppss (point-at-bol)))
offset (- (point) (save-excursion
(back-to-indentation)
(point))))
(unless (nth 3 parse-status)
(indent-line-to (js2-proper-indentation parse-status))
(when (cl-plusp offset)
(forward-char offset)))))
(defsubst js2--jsx-find-before-tag ()
"Find where JSX starts.
Assume JSX appears in the following instances:
- Inside parentheses, when returned or as the first argument
to a function, and after a newline
- When assigned to variables or object properties, but only
on a single line
- As the N+1th argument to a function
This is an optimized version of (re-search-backward \"[(,]\n\"
nil t), except set point to the end of the match. This logic
executes up to the number of lines in the file, so it should be
really fast to reduce that impact."
(let (pos)
(while (and (> (point) (point-min))
(not (progn
(end-of-line 0)
(when (or (eq (char-before) 40) (eq (char-before) 44)) (setq pos (1- (point))))))))
pos))
(defconst js2--jsx-end-tag-re
(concat "</" sgml-name-re ">\\|/>")
"Find the end of a JSX element.")
(defconst js2--jsx-after-tag-re "[),]"
"Find where JSX ends.
This complements the assumption of where JSX appears from
`js--jsx-before-tag-re', which see.")
(defun js2--jsx-indented-element-p ()
"Determine if/how the current line should be indented as JSX.
Return `first' for the first JSXElement on its own line.
Return `nth' for subsequent lines of the first JSXElement.
Return `expression' for an embedded JS expression.
Return `after' for anything after the last JSXElement.
Return nil for non-JSX lines.
Currently, JSX indentation supports the following styles:
- Single-line elements (indented like normal JS):
var element = <div></div>;
- Multi-line elements (enclosed in parentheses):
function () {
return (
<div>
<div></div>
</div>
);
}
- Function arguments:
React.render(
<div></div>,
document.querySelector(\\='.root\\=')
);"
(let ((current-pos (point))
(current-line (line-number-at-pos))
last-pos
before-tag-pos before-tag-line
tag-start-pos tag-start-line
tag-end-pos tag-end-line
after-tag-line
parens paren type)
(save-excursion
(and
(progn
(end-of-line)
(while (and (not tag-start-pos)
(setq last-pos (js2--jsx-find-before-tag)))
(while (forward-comment 1))
(when (= (char-after) 60) (setq before-tag-pos last-pos
tag-start-pos (point)))
(goto-char last-pos))
tag-start-pos)
(progn
(setq before-tag-line (line-number-at-pos before-tag-pos)
tag-start-line (line-number-at-pos tag-start-pos))
(and
(> current-line before-tag-line)
(>= current-line tag-start-line)))
(cond
((progn
(while (and (not tag-end-pos)
(setq last-pos (re-search-forward js2--jsx-end-tag-re nil t)))
(while (forward-comment 1))
(when (looking-at js2--jsx-after-tag-re)
(setq tag-end-pos last-pos)))
tag-end-pos)
(setq tag-end-line (line-number-at-pos tag-end-pos)
after-tag-line (line-number-at-pos after-tag-line))
(or (and
(<= current-line tag-end-line)
(<= current-line after-tag-line))
(and
(> current-line tag-end-line)
(< current-line after-tag-line)
(setq type 'after))))
(t))
(cond
((not type)
(goto-char current-pos)
(end-of-line)
(setq parens (nth 9 (syntax-ppss)))
(while (and parens (not type))
(setq paren (car parens))
(cond
((and (>= paren tag-start-pos)
(= (char-after paren) 123) (> current-line (line-number-at-pos paren))
(cond
((progn
(goto-char paren)
(ignore-errors (let (forward-sexp-function)
(forward-sexp))))
(< current-line (line-number-at-pos)))
(t)))
(setq type 'expression))
(t (setq parens (cdr parens)))))
t)
(t))
(cond
(type)
((= current-line tag-start-line) 'first)
('nth))))))
(defmacro js2--as-sgml (&rest body)
"Execute BODY as if in sgml-mode."
`(with-syntax-table sgml-mode-syntax-table
(let (forward-sexp-function
parse-sexp-lookup-properties)
,@body)))
(defun js2--expression-in-sgml-indent-line ()
"Indent the current line as JavaScript or SGML (whichever is farther)."
(let* (indent-col
(savep (point))
(inhibit-point-motion-hooks t)
(parse-status (save-excursion
(syntax-ppss (point-at-bol)))))
(unless (nth 3 parse-status)
(setq indent-col (save-excursion
(back-to-indentation)
(if (>= (point) savep) (setq savep nil))
(js2--as-sgml (sgml-calculate-indent))))
(if (null indent-col)
'noindent
(setq indent-col (max (js2-proper-indentation parse-status)
(+ indent-col js2-basic-offset)))
(if savep
(save-excursion (indent-line-to indent-col))
(indent-line-to indent-col))))))
(defun js2-jsx-indent-line ()
"Indent the current line as JSX (with SGML offsets).
i.e., customize JSX element indentation with `sgml-basic-offset'
et al."
(interactive)
(let ((indentation-type (js2--jsx-indented-element-p)))
(cond
((eq indentation-type 'expression)
(js2--expression-in-sgml-indent-line))
((or (eq indentation-type 'first)
(eq indentation-type 'after))
(cl-letf (((symbol-function #'js2-continued-expression-p) 'ignore))
(js2-indent-line)))
((eq indentation-type 'nth)
(js2--as-sgml (sgml-indent-line)))
(t (js2-indent-line)))))
(provide 'js2-old-indent)