\ProvidesPackage{biblatex-ext-oasymb-tikz}
  [2019/04/04 v0.7a open access symbols with TikZ (MW)]

\RequirePackage{etoolbox}
\RequirePackage{kvoptions}

\protected\def\extblx@oasymb@tikz@error#1#2{%
  \PackageError{biblatex-ext-oasymb-tikz}{#1}{#2.}}

\protected\def\extblx@oasymb@tikz@warning@noline{%
  \PackageWarningNoLine{biblatex-ext-oasymb-tikz}}

\let\extblx@oasymb@tikz@warning\extblx@oasymb@tikz@warning@noline
\AtEndOfPackage{%
  \protected\def\extblx@oasymb@tikz@warning{%
    \PackageWarning{biblatex-ext-oasymb-tikz}}}

\RequirePackage{tikz}

% PLoS Open Access symbol based on
% https://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg
% public domain/CC0 by PLoS & Wikipedia users Nina, Beao and JakobVoss
\definecolor{extblx@oasymb@tikz@plos@orange}{HTML}{f68212}
\newcommand*{\extblx@oasymb@tikz@plos@tikz}{%
  \begin{tikzpicture}[x=.1pt,y=.1pt]
    \begin{scope}
      \clip (06,73) rectangle ++(52,26);
      \fill[extblx@oasymb@tikz@plos@orange, even odd rule]
        (32,73) circle[radius=26]
        (32,73) circle[radius=15];
    \end{scope}
    \fill[extblx@oasymb@tikz@plos@orange, even odd rule]
      (32,32) circle[radius=32]
      (32,32) circle[radius=21]
      (32,32) circle[radius= 9];
    \fill[extblx@oasymb@tikz@plos@orange]
      (47,47) rectangle ++ (11,26);
  \end{tikzpicture}%
}

\newsavebox{\extblx@oasymb@tikz@plos@box}
\sbox{\extblx@oasymb@tikz@plos@box}{\extblx@oasymb@tikz@plos@tikz}
\newcommand*{\extblx@oasymb@tikz@plos}{%
  \usebox{\extblx@oasymb@tikz@plos@box}}

% PLoS symbols is standard
\newcommand*{\oasymbol}{\extblx@oasymb@tikz@plos}

% Open-Acess.net Open Acess symbol
% redrawn with TikZ from
% http://open-access.net/fileadmin/logos/oa.svg
% public domain according to
% https://commons.wikimedia.org/wiki/File:Open_access.svg
% might be covered by open-access.net's overall CC-BY 4.0 license
% (https://creativecommons.org/licenses/by/4.0/)
% see https://open-access.net/impressum/
% the site states no specific conditions for use of the logo
% other than
%   "Das Logo der Informationsplattform darf nachgenutzt werden,
%    gerne mit einem Link zu open-access.net"
% on https://open-access.net/ueber-uns/
% see also https://open-access.net/community/materialien/
% logo by
% Medien + Design
% Center for Digital Systems
% Competence Center for E-Learning and Multimedia
% Freie Universität Berlin
\definecolor{extblx@oasymb@tikz@oanet@green}{HTML}{356031}
\definecolor{extblx@oasymb@tikz@oanet@gold}{HTML}{f9c63a}
\definecolor{extblx@oasymb@tikz@oanet@intersect}{HTML}{89923a}

\newcommand*{\extblx@oasymb@tikz@oanet@tikz}{%
  \begin{tikzpicture}[x=1.1pt,y=1.1pt]
    \fill[extblx@oasymb@tikz@oanet@green, even odd rule]
      ( 4,4) circle[radius=4.3]
      ( 4,4) circle[radius=2.7];
    \begin{scope}
      \clip % this is *terrible*, but it was the only way I could stop
            % some viewers from adding thin lines that shouldn't be there
        (11,4) circle[radius=2.7]
        -- +(-4.3,-4.3) -- +(-4.3,+4.3) -- +(+4.3,+4.3) -- +(+4.3,-4.3)
        -- +(-4.3,-4.3);
      \fill[extblx@oasymb@tikz@oanet@gold, even odd rule]
        (11,4) ++ (0:4.3) arc (0:300:4.3) -- (11,4) ++ (300:4.3) -- cycle
        (11,4) ++ (0:2.7) arc (0:300:2.7) -- (11,4) ++ (300:2.7) -- cycle;
    \end{scope}
    \begin{scope}
      \clip                                  ( 4,4) circle[radius=4.3];
      \fill[extblx@oasymb@tikz@oanet@intersect] (11,4) circle[radius=4.3];
    \end{scope}
    \fill[extblx@oasymb@tikz@oanet@gold]
      (11,4) ++ (2.7,.1) rectangle ++(1.6,-4.1);
  \end{tikzpicture}%
}

\newsavebox{\extblx@oasymb@tikz@oanet@box}
\sbox{\extblx@oasymb@tikz@oanet@box}{\extblx@oasymb@tikz@oanet@tikz}
\newcommand*{\extblx@oasymb@tikz@oanet}{%
  \usebox{\extblx@oasymb@tikz@oanet@box}}

\protected\def\extblx@oasymb@tikz@opt@symbol@process#1{%
  \begingroup
  \edef\extblx@oasymb@tikz@tempa{\endgroup
    \noexpand\extblx@oasymb@tikz@opt@symbol@process@i{#1}}%
  \extblx@oasymb@tikz@tempa}

\def\extblx@oasymb@tikz@opt@symbol@process@i#1{%
  \ifcsundef{extblx@oasymb@tikz@#1}
    {\extblx@oasymb@tikz@error
      {Unknown value\MessageBreak
       \space\space'#1'\MessageBreak
       for option 'symbol'}
      {The symbol '#1' does not exist.\MessageBreak
       Please consult the documentation for a list of valid options}}
    {\edef\oasymbol{%
       \expandonce{\csname extblx@oasymb@tikz@#1\endcsname}}}}

\newrobustcmd*{\DefineTikZOASymbol}{%
  \extblx@oasymb@tikz@warning{%
    The command '\string\DefineTikZOASymbol'\MessageBreak
    is deprecated.\MessageBreak
    Use '\string\DefineOASymbol' instead.\MessageBreak
    Using '\string\DefineOASymbol'}%
  \DefineOASymbol}

\newrobustcmd*{\DefineOASymbol}[1][plos]{%
  \begingroup
  \edef\extblx@oasymb@tikz@tempa{\endgroup
    \noexpand\extblx@oasymb@tikz@DefineOASymbol@i{#1}}%
  \extblx@oasymb@tikz@tempa}

\protected\def\extblx@oasymb@tikz@DefineOASymbol@i#1{%
  \ifcsundef{extblx@oasymb@tikz@#1}
    {\extblx@oasymb@tikz@error
      {Unknown symbol option\MessageBreak
       \space\space'#1'}
      {The symbol '#1' does not exist.\MessageBreak
       Please consult the documentation for a list of valid options}}
    {\edef\oasymbol{%
       \expandonce{\csname extblx@oasymb@tikz@#1\endcsname}}}}

\SetupKeyvalOptions{
  family=extblx@oasymb@tikz@opt,
  prefix=extblx@oasymb@tikz@opt@,
}

\DeclareStringOption[plos]{symbol}
\DeclareVoidOption{plos}{\csdef{extblx@oasymb@tikz@opt@symbol}{plos}}
\DeclareVoidOption{oanet}{\csdef{extblx@oasymb@tikz@opt@symbol}{oanet}}

\ProcessKeyvalOptions*

\extblx@oasymb@tikz@opt@symbol@process{%
  \csuse{extblx@oasymb@tikz@opt@symbol}}

\endinput
%
% This file is part of the biblatex-ext bundle.
% biblatex-ext is released under the LaTeX Project Public License v1.3c
% or later.
%
% A complete list of files included in that package can be found in
% README.md or - failing that - in ext-standard.bbx.
%
% Official releases of this package are on CTAN
%   https://www.ctan.org/pkg/biblatex-ext
% development takes place on GitHub
%   https://github.com/moewew/biblatex-ext
%
