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+;;; index.el --- AUCTeX support for indices with index.sty.  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 1999, 2020 Free Software Foundation, Inc.
+
+;; Author: Carsten Dominik <dominik@strw.leidenuniv.nl>
+;; Maintainer: auctex-devel@gnu.org
+
+;; This file is part of AUCTeX.
+
+;; AUCTeX is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; AUCTeX is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with AUCTeX; see the file COPYING.  If not, write to the Free
+;; Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+;; 02110-1301, USA.
+
+;;; Code:
+
+(require 'tex)
+(require 'latex)
+
+(TeX-add-style-hook
+ "index"
+ (lambda ()
+
+   (TeX-add-symbols
+    ;; New indices
+    '("newindex" [ "Counter" ] "Tag"
+      "Extension of raw index" "Extension of processed index" "Index title")
+    '("renewindex" [ "Counter" ] "Tag"
+      "Extension of raw index" "Extension of processed index" "Index title")
+    "makeindex"
+    '("disableindex" "Tag[,tag...]")
+
+    ;; Printing the index
+    '("printindex" [ "Indextag" ] [ "Prologue" ])
+    "indexspace"
+
+    ;; Index entries
+    '("index" [ TeX-arg-index-tag ] TeX-arg-index)
+    '("index*" [ TeX-arg-index-tag ] TeX-arg-index)
+
+    ;; Showidx-like stuff
+    "proofmodetrue" "proofmodefalse" '("indexproofstyle" "Style")
+
+    ;; Shortcuts (THESE ARE DEPRECATED AND SHOULD NOT BE USED
+    "shortindexingon" "shortindexinoff")
+
+   ;; Parsing index macros
+   (setq LaTeX-auto-regexp-list
+         (append
+
+          ;; The first regexp is faster, but less accurate
+          ;;'(("\\\\index\\*?\\[[^{}]*\\]{\\([^}]*\\)"
+          ;;   1 LaTeX-auto-index-entry))
+
+          ;; The second regexp is very good, but slower.
+          '(("\\\\index\\*?\\[[^{}]*\\]{\\([^}{]*\\({[^}{]*\\({[^}{]*\\({[^}{]*}[^}{]*\\)*}[^}{]*\\)*}[^}{]*\\)*\\)}"
+             1 LaTeX-auto-index-entry))
+
+          LaTeX-auto-regexp-list))
+
+   ;; Completion for the index entries in \index and |see commands
+   (setq TeX-complete-list
+         (append
+          '(("\\\\index\\*?\\(\\[[^][{}]*\\]\\)?{\\([^{}\n\r]*\\)" 
+             2 LaTeX-index-entry-list)
+            ("|see{\\([^}]*\\)" 1 LaTeX-index-entry-list))
+          TeX-complete-list))
+
+   ;; RefTeX support
+   (and (fboundp 'reftex-add-index-macros)
+        (reftex-add-index-macros '(index))))
+ TeX-dialect)
+
+(defvar LaTeX-index-package-options nil
+  "Package options for the index package.")
+
+;;; index.el ends here