;;; Code:
+(require 'sgml-mode)
+
(defvar js2-language-version)
(declare-function js2-mark-safe-local "js2-mode")
followed by an opening brace.")
(defconst js2-indent-operator-re
- (concat "[-+*/%<>&^|?:.]\\([^-+*/]\\|$\\)\\|!?=\\|"
- (regexp-opt '("in" "instanceof") 'words))
+ (concat "[-+*/%<>&^|?:.]\\([^-+*/.]\\|$\\)\\|!?=\\|"
+ (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") 'words)
+ (regexp-opt '("var" "let" "const") 'symbols)
"Regular expression matching variable declaration keywords.")
(defun js2-re-search-forward-inner (regexp &optional bound count)
(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 (looking-at ":"))
+ (or (not (eq (char-after) ?:))
(save-excursion
(and (js2-re-search-backward "[?:{]\\|\\_<case\\_>" nil t)
- (looking-at "?"))))))
+ (eq (char-after) ??))))
+ (not (and
+ (eq (char-after) ?*)
+ ;; Generator method (possibly using computed property).
+ (looking-at (concat "\\* *\\(?:\\[\\|"
+ js2-mode-identifier-re
+ " *(\\)"))
+ (save-excursion
+ (js2-backward-sws)
+ ;; We might misindent some expressions that would
+ ;; return NaN anyway. Shouldn't be a problem.
+ (memq (char-before) '(?, ?} ?{)))))))
(defun js2-continued-expression-p ()
"Return non-nil if the current line continues an expression."
(save-excursion
(back-to-indentation)
- (or (js2-looking-at-operator-p)
- (when (catch 'found
- (while (and (re-search-backward "\n" nil t)
- (let ((state (syntax-ppss)))
- (when (nth 4 state)
- (goto-char (nth 8 state))) ;; skip comments
- (skip-chars-backward " \t")
- (if (bolp)
- t
- (throw 'found t))))))
- (backward-char)
- (when (js2-looking-at-operator-p)
- (backward-char)
- (not (looking-at "\\*\\|\\+\\+\\|--\\|/[/*]")))))))
+ (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
(goto-char bracket)
(cond
((looking-at "[({[][ \t]*\\(/[/*]\\|$\\)")
- (when (save-excursion (skip-chars-backward " \t)")
+ (when (save-excursion (skip-chars-backward " \t\n)")
(looking-at ")"))
(backward-list))
(back-to-indentation)
(when (cl-plusp offset)
(forward-char offset)))))
+;;; JSX Indentation
+
+;; The following JSX indentation code is copied basically verbatim from js.el at
+;; 958da7f, except that the prefixes on the functions/variables are changed.
+
+(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
+ ;; Determine if we're inside a jsx element
+ (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
+ ;; A "before" line which also starts an element begins with js, so
+ ;; indent it like js
+ (> current-line before-tag-line)
+ ;; Only indent the jsx lines like jsx
+ (>= current-line tag-start-line)))
+ (cond
+ ;; Analyze bounds if there are any
+ ((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
+ ;; Ensure we're actually within the bounds of the jsx
+ (<= current-line tag-end-line)
+ ;; An "after" line which does not end an element begins with
+ ;; js, so indent it like js
+ (<= current-line after-tag-line))
+ (and
+ ;; Handle another case where there could be e.g. comments after
+ ;; the element
+ (> current-line tag-end-line)
+ (< current-line after-tag-line)
+ (setq type 'after))))
+ ;; They may not be any bounds (yet)
+ (t))
+ ;; Check if we're inside an embedded multi-line js expression
+ (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)
+ ;; Curly bracket indicates the start of an embedded expression
+ (= (char-after paren) 123) ; {
+ ;; The first line of the expression is indented like sgml
+ (> current-line (line-number-at-pos paren))
+ ;; Check if within a closing curly bracket (if any)
+ ;; (exclusive, as the closing bracket is indented like sgml)
+ (cond
+ ((progn
+ (goto-char paren)
+ (ignore-errors (let (forward-sexp-function)
+ (forward-sexp))))
+ (< current-line (line-number-at-pos)))
+ (t)))
+ ;; Indicate this guy will be indented specially
+ (setq type 'expression))
+ (t (setq parens (cdr parens)))))
+ t)
+ (t))
+ (cond
+ (type)
+ ;; Indent the first jsx thing like js so we can indent future jsx things
+ ;; like sgml relative to the first thing
+ ((= 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))
+ ;; Don't whine about errors/warnings when we're indenting.
+ ;; This has to be set before calling parse-partial-sexp below.
+ (inhibit-point-motion-hooks t)
+ (parse-status (save-excursion
+ (syntax-ppss (point-at-bol)))))
+ ;; Don't touch multiline strings.
+ (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
+ ;; Use whichever indentation column is greater, such that the sgml
+ ;; column is effectively a minimum
+ (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))
+ ;; Don't treat this first thing as a continued expression (often a "<" or
+ ;; ">" causes this misinterpretation)
+ (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)
;;; js2-old-indent.el ends here