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+;;; sidecap.el --- AUCTeX style for `sidecap.sty' (v1.6f)  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021, 2022 Free Software Foundation, Inc.
+
+;; Author: Arash Esbati <arash@gnu.org>
+;; Maintainer: auctex-devel@gnu.org
+;; Created: 2021-12-11
+;; Keywords: tex
+
+;; 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.
+
+;;; Commentary:
+
+;; This file adds support for `sidecap.sty' (v1.6f) from 2003/06/06.
+;; `sidecap.sty' is part of TeXLive.
+
+;;; Code:
+
+(require 'tex)
+(require 'latex)
+
+(defun LaTeX-env-sidecap-float (environment)
+  "Create ENVIRONMENT with \\caption and \\label commands.
+This function runs `LaTeX-env-figure' and inserts the first
+optional argument 'relwidth' provided by environments of the
+package sidecap."
+  (let ((relwidth (TeX-read-string
+                   (TeX-argument-prompt t nil "Relative caption width")))
+        (sc-active-mark (and (TeX-active-mark)
+                             (not (eq (mark) (point)))))
+        (p (point-marker))
+        s)
+    ;; Run `LaTeX-env-figure' which does the major part of the job:
+    (LaTeX-env-figure environment)
+    ;; Now save the position:
+    (setq s (point-marker))
+    ;; Search backwards to see if an optional float-placement arg is
+    ;; inserted; this would be the 2nd arg for sidecap environments:
+    (save-excursion
+      (re-search-backward (concat (regexp-quote TeX-esc)
+                                  "begin"
+                                  "[ \t]*"
+                                  TeX-grop
+                                  (regexp-quote environment)
+                                  "\\(" TeX-grcl "\\)"
+                                  "[ \t]*"
+                                  "\\("
+                                  (regexp-quote LaTeX-optop)
+                                  ;; Float placement:
+                                  "\\([a-zA-Z!]*\\)"
+                                  (regexp-quote LaTeX-optcl)
+                                  "\\)?")
+                          p t))
+    (cond (;; Insert the first optional arg at any rate if non-empty:
+           (and relwidth (not (string= relwidth "")))
+           (goto-char (match-end 1))
+           (insert LaTeX-optop relwidth LaTeX-optcl))
+          ;; Insert a pair of empty brackets if relwidth is empty and
+          ;; float-placement is given:
+          ((and (or (null relwidth)
+                    (string= relwidth ""))
+                (match-string 3))
+           (goto-char (match-beginning 2))
+           (insert LaTeX-optop LaTeX-optcl))
+          (t nil))
+    ;; Go back to where we started if we have moved at all:
+    (unless (= s (point))
+      (goto-char s))
+    ;; Insert a tabular stored in `LaTeX-default-tabular-environment':
+    (when (and (member environment '("SCtable" "SCtable*"))
+               (not sc-active-mark))
+      (LaTeX-environment-menu LaTeX-default-tabular-environment))
+    ;; Clean up the markers:
+    (set-marker s nil)
+    (set-marker p nil)))
+
+(TeX-add-style-hook
+ "sidecap"
+ (lambda ()
+
+   ;; Add the environments provided by the package:
+   (LaTeX-add-environments
+    '("SCtable"   LaTeX-env-sidecap-float)
+    '("SCtable*"  LaTeX-env-sidecap-float)
+    '("SCfigure"  LaTeX-env-sidecap-float)
+    '("SCfigure*" LaTeX-env-sidecap-float)
+    '("wide"))
+
+   ;; Add the float environments to `LaTeX-label-alist':
+   (dolist (env '("SCfigure" "SCfigure*"))
+     (add-to-list 'LaTeX-label-alist `(,env . LaTeX-figure-label) t))
+
+   (dolist (env '("SCtable" "SCtable*"))
+     (add-to-list 'LaTeX-label-alist `(,env . LaTeX-table-label) t))
+
+   ;; The next 2 can be set with '\renewcommand':
+   (TeX-add-symbols
+    "sidecaptionsep"
+    "sidecaptionrelwidth")
+
+   ;; Run the style hook for 'ragged2e' if necessary:
+   (when (or (LaTeX-provided-package-options-member "sidecap" "raggedright")
+             (LaTeX-provided-package-options-member "sidecap" "raggedleft")
+             (LaTeX-provided-package-options-member "sidecap" "ragged"))
+     (TeX-run-style-hooks "ragged2e")))
+
+ TeX-dialect)
+
+(defvar LaTeX-sidecap-package-options
+  '("outercaption" "innercaption"
+    "leftcaption" "rightcaption"
+    "wide"
+    "raggedright" "raggedleft" "ragged")
+  "Package options for the sidecap package.")
+
+;;; sidecap.el ends here