% Copyright 2003--2007 by Till Tantau
% Copyright 2010 by Vedran Mileti\'c
% Copyright 2013,2015 by Vedran Mileti\'c, Joseph Wright
% Copyright 2017 by Joseph Wright
%
% 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 LICENSE.md for more details.

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

\newrobustcmd*\ProcessOptionsBeamer{%
  \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\beamer@origkverr\KV@errx
  \let\beamer@origxkverr\XKV@err
  \let\KV@errx=\@gobble% never mind
  \let\XKV@err=\@gobble% never mind
  \@tempa
  \let\KV@errx\beamer@origkverr
  \let\XKV@err\beamer@origxkverr
  \AtEndOfPackage{\let\@unprocessedoptions\relax}}

\newrobustcmd\ExecuteOptionsBeamer[1]{%
  \setkeys{\@currname}{#1}}

\newrobustcmd\DeclareOptionBeamer[1]{\@ifnextchar[{\beamer@dokv{#1}}{\beamer@dokv{#1}[]}}
\long\def\beamer@dokv#1[#2]#3{\define@key{\@currname}{#1}[{#2}]{#3}}

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

\newrobustcmd*\defbeameroption{\define@key{beamer@option}}
\newrobustcmd*\setbeameroption{\setkeys{beamer@option}}