X-Git-Url: https://code.delx.au/gnu-emacs-elpa/blobdiff_plain/0ded730347c5d42900b28ba3fd307e7da828f280..f10533854f4c7bb54247a11981191bf37b70cb36:/packages/js2-mode/js2-old-indent.el

diff --git a/packages/js2-mode/js2-old-indent.el b/packages/js2-mode/js2-old-indent.el
index efc9053a2..0b0ed3a5d 100644
--- a/packages/js2-mode/js2-old-indent.el
+++ b/packages/js2-mode/js2-old-indent.el
@@ -54,6 +54,8 @@
 
 ;;; Code:
 
+(require 'sgml-mode)
+
 (defvar js2-language-version)
 
 (declare-function js2-mark-safe-local "js2-mode")
@@ -129,13 +131,13 @@ switch statement body are indented one additional level."
 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)
@@ -215,30 +217,38 @@ and comments have been removed."
 
 (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
@@ -431,7 +441,7 @@ indentation is aligned to that column."
         (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)
@@ -484,6 +494,215 @@ indentation is aligned to that column."
       (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