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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
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