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+;;; breqn.el --- AUCTeX style for `breqn.sty' (v0.98j)  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2017--2020 Free Software Foundation, Inc.
+
+;; Author: Arash Esbati <arash@gnu.org>
+;; Maintainer: auctex-devel@gnu.org
+;; Created: 2017-01-06
+;; 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 `breqn.sty' (v0.98j) from 2020/04/19.
+;; `breqn.sty' is part of TeXLive.
+
+;; In breqn documentation, there is the following statement:
+;;
+;;   9 Various environment options
+;;
+;;   Use of the normal \label command instead of the label option
+;;   works, I think, most of the time (untested).
+;;
+;; To be on the safe side, a label should be written in the optional
+;; argument of an environment as value to the `label' key, e.g.:
+;;
+;;   \begin{dmath}[label={eq:42}]
+;;     ...
+;;   \end{dmath}
+;;
+;; This style achieves this requirement by using the function
+;; `LaTeX-env-label-as-keyval'.
+
+;;; Code:
+
+(require 'latex)
+
+(defvar LaTeX-breqn-key-val-options
+  '(("style" ("\\tiny" "\\scriptsize" "\\footnotesize" "\\small"
+              "\\normalsize" "\\large" "\\Large" "\\LARGE"
+              "\\huge" "\\Huge"))
+    ("number")
+    ("indentstep")
+    ("compact")
+    ("spread")
+    ("frame")
+    ("framesep")
+    ("breakdepth"))
+  "Key=value options for breqn environments.
+The keys \"label\" and \"labelprefix\" are omitted.")
+
+(defvar LaTeX-breqn-key-val-label-regexp
+  `(,(concat
+      "\\\\begin{"
+      (regexp-opt '("dmath" "dseries" "dgroup" "darray"))
+      "}"
+      (LaTeX-extract-key-value-label))
+    1 LaTeX-auto-label)
+  "Matches the label inside an optional argument after \\begin{<breqn-env's>}.")
+
+(defun LaTeX-breqn-env (env)
+  "Insert ENV from breqn package incl. optional key=val argument.
+Keys offered for key=val query depend on ENV.  \"label\" and
+\"labelprefix\" are omitted."
+  (let ((keyvals
+         (TeX-read-key-val t
+                           (cond ((or (string= env "dgroup")
+                                      (string= env "dgroup*"))
+                                  (append '(("noalign") ("brace"))
+                                          LaTeX-breqn-key-val-options))
+                                 ((or (string= env "darray")
+                                      (string= env "darray*"))
+                                  (append '(("noalign") ("brace") ("cols" ("{}")))
+                                          LaTeX-breqn-key-val-options))
+                                 (t LaTeX-breqn-key-val-options)))))
+    (LaTeX-insert-environment env (when (and keyvals
+                                             (not (string= keyvals "")))
+                                    (concat LaTeX-optop keyvals LaTeX-optcl)))
+    (LaTeX-env-label-as-keyval nil nil keyvals env)))
+
+(add-hook 'TeX-update-style-hook #'TeX-auto-parse t)
+
+(TeX-add-style-hook
+ "breqn"
+ (lambda ()
+
+   ;; Add breqn to parser:
+   (TeX-auto-add-regexp LaTeX-breqn-key-val-label-regexp)
+
+   ;; Tell AUCTeX that we want to prefix the labels with `LaTeX-equation-label':
+   (let ((envs '("dmath"  "dseries" "dgroup" "darray")))
+     (dolist (env envs)
+       (add-to-list 'LaTeX-label-alist `(,env . LaTeX-equation-label) t)))
+
+   ;; For RefTeX, we must distinguish between equation and eqnarray-like:
+   ;; breqn env == equivalent -- starred
+   ;; dmath     == equation   -- dmath*   == unnumbered
+   ;; dseries   == equation   -- dseries* == unnumbered
+   ;; dgroup    == align      -- dgroup*  == unnumbered
+   ;; darray    == eqnarray   -- darray*  == unnumbered
+   (when (fboundp 'reftex-add-label-environments)
+     (dolist (env '("dmath" "dseries" "dgroup"))
+       (reftex-add-label-environments `((,env ?e nil nil t))))
+     (reftex-add-label-environments '(("darray" ?e nil nil eqnarray-like))))
+
+   (LaTeX-add-environments
+    '("dmath" LaTeX-breqn-env)
+    '("dmath*" LaTeX-breqn-env)
+    '("dseries" LaTeX-breqn-env)
+    '("dseries*" LaTeX-breqn-env)
+    '("dgroup" LaTeX-breqn-env)
+    '("dgroup*" LaTeX-breqn-env)
+    '("darray" LaTeX-breqn-env)
+    '("darray*" LaTeX-breqn-env)
+    '("dsuspend"))
+
+   (TeX-add-symbols
+    '("condition"  [ "Punctuation mark (default ,)" ] t)
+    '("condition*" [ "Punctuation mark (default ,)" ] t)
+    '("hiderel" t)))
+ TeX-dialect)
+
+(defvar LaTeX-breqn-package-options nil
+  "Package options for the breqn package.")
+
+;;; breqn.el ends here