% $Id: DEoptions.sty 574 2011-09-05 08:17:17Z herbert $
% Copyright 2011 by Herbert Voss
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/licenses/LICENSE for more details.

\RequirePackage{keyval}[1997/11/10]

\def\ProcessOptionsExa{%
 \let\@tempa\@empty
 \ifx\@currext\@clsextension%
 \else
 \@for\CurrentOption:=\@classoptionslist\do{%
   \@ifundefined{KV@\@currname @\CurrentOption}%
   {}{\edef\@tempa{\@tempa,\CurrentOption,}}}%
 \fi
 \edef\@tempa{%
   \noexpand\setkeys{\@currname}{\@tempa\@ptionlist{\@currname.\@currext}}}%
 \let\exa@origkverr\KV@err%
 \ifx\@currext\@clsextension\let\KV@errx=\@gobble\fi% never mind
 \@tempa%
 \let\KV@err\exa@origkverr%
 \AtEndOfPackage{\let\@unprocessedoptions\relax}}

\def\ExecuteOptionsExa#1{\setkeys{\@currname}{#1}}
\def\DeclareOptionExa#1{\@ifnextchar[{\exa@dokv{#1}}{\exa@dokv{#1}[]}}
\long\def\exa@dokv#1[#2]#3{\define@key{\@currname}{#1}[{#2}]{#3}}

\def\exa@filterclassoptions{%
 \def\exa@filteredclassoptionslist{}
 \@for\CurrentOption:=\@classoptionslist\do{%
   \ifx\CurrentOption\@empty\else
   \@expandtwoargs\in@{=}{\CurrentOption}%
   \ifin@
   \else
   \edef\exa@filteredclassoptionslist{%
     \exa@filteredclassoptionslist,\CurrentOption}
   \fi
   \fi
 }%
 \let\@classoptionslist=\exa@filteredclassoptionslist%
}

\newcommand\defexaoption{\define@key{exa@option}}
\newcommand\setexaoption{\setkeys{exa@option}}

\endinput

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