%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%
%                                                                          %
% This is file 'pgfkeyx.sty', version 0.0.1, April 2012.                   %
%                                                                          %
% This package and accompanying files may be distributed and/or            %
% modified under the conditions of the LaTeX Project Public License,       %
% either version 1.3 of this license or any later version. The latest      %
% version of this license is in http://www.latex-project.org/lppl.txt      %
% and version 1.3 or later is part of all distributions of LaTeX           %
% version 2005/12/01 or later.                                             %
%                                                                          %
% The LPPL maintenance status of this software is 'author-maintained'.     %
%                                                                          %
% This software is provided 'as it is', without warranty of any kind,      %
% either expressed or implied, including, but not limited to, the          %
% implied warranties of merchantability and fitness for a particular       %
% purpose.                                                                 %
%                                                                          %
% Copyright (c) 2012 Ahmed Musa (amusa22@gmail.com).                       %
%                                                                          %
%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%

\begingroup
\catcode064 11 % @
\catcode123 01 % {
\catcode125 02 % }
\catcode044 12 % ,
\def\reserved@a{\endgroup
  \def\do##1,{%
    \ifx##1\do\else
      \catcode##1\string=\the\catcode##1 %
      \expandafter\do
    \fi
  }%
  \edef\pgfkeys@restorecodes{\do035,064,123,125,061,059,\do,}%
}
\reserved@a
\catcode035 06 % #
\catcode064 11 % @
\catcode123 01 % {
\catcode125 02 % }
\catcode061 12 % =
\catcode044 12 % ,
\def\do#1=#2,{%
  \ifx#1\do\else
    \edef\pgfkeys@restorecodes{%
      \pgfkeys@restorecodes
      \catcode#1=\the\catcode#1 %
    }%
    \catcode#1=#2\relax
    \expandafter\do
  \fi
}
\do 032=10,033=12,036=03,038=04,040=12,041=12,042=12,043=12,%
059=12,045=12,047=12,058=12,063=12,091=12,093=12,126=13,\do=,%

\NeedsTeXFormat{LaTeX2e}[2011/06/27]
\ProvidesPackage{pgfkeyx}[2012/04/13 v0.0.1 Patch for pgfkeys (AM)]
\begingroup\expandafter\endgroup\expandafter
\ifx\csname ver@pgfkeys.sty\endcsname\@undefined
  \PackageError{pgfkeyx}{'pgfkeys' package not loaded}
    {This package requires 'pgfkeys' package to be loaded first.}%
  \expandafter\endinput
\fi

\newif\ifpgfkeys@tempst
\newif\ifpgfkeysloopbreak
\newif\ifpgfkeys@preservebrace % preserve outer braces in key values?
\newif\ifpgfkeys@in
\newif\ifpgfkeys@tracingkeys % include tracing features in the future.
\long\def\pgfkeys@iofi#1{#1}
\long\def\pgfkeys@iofii#1#2{#1}
\long\def\pgfkeys@iiofii#1#2{#2}
\long\protected\def\pgfkeys@ifnextchar@a#1#2#3{%
  \let\reserved@d=#1\def\reserved@a{#2}\def\reserved@b{#3}%
  \futurelet\pgfkeys@next\pgfkeys@ifnextchar@c
}
\lowercase{\lowercase{\let\pgfkeys@sptoken= } }
\lowercase{\def\pgfkeys@ifnextchar@b} %
  {\futurelet\pgfkeys@next\pgfkeys@ifnextchar@c}
\def\pgfkeys@ifnextchar@c{%
  \ifx\pgfkeys@next\pgfkeys@sptoken
    \let\reserved@c\pgfkeys@ifnextchar@b
  \else
    \ifx\pgfkeys@next\reserved@d
      \let\reserved@c\reserved@a
    \else
      \let\reserved@c\reserved@b
    \fi
  \fi
  \reserved@c
}
\long\protected\def\ifpgfkeysnextchar#1#2#3{%
  \pgfkeys@ifnextchar@a\bgroup
  {\pgfkeys@ifnextchar@a{#1}{#2}{#3}}%
  {\pgfkeys@ifnextchar{#1}{#2}{#3}}%
}
\long\def\pgfkeys@ifnextchar#1#2#3#4{%
  \if\string#1\string#4%
    \expandafter\pgfkeys@iofii
  \else
    \expandafter\pgfkeys@iiofii
  \fi
  {#2}{#3}#4%
}
\long\protected\def\pgfkeys@starorlong#1{%
  \ifpgfkeysstar{\let\l@ngrel@x\relax#1}{\let\l@ngrel@x\long#1}%
}
\long\protected\def\pgfkeys@testopt#1#2{\ifpgfkeysnextchar[{#1}{#1[{#2}]}}
\long\protected\def\ifpgfkeysstar#1{\ifpgfkeysnextchar*{\pgfkeys@iofii{#1}}}
\def\pgfkeys@defcmd#1#2#3{%
  \ifdefined#3%
    \ifx#3\relax\else
      \pgfkeys@error{Command '\string#3' already exists}%
    \fi
  \fi
  \l@ngrel@x
  \ifcat$\detokenize{#2}$\else
    \ifx#2p\expandafter\expandafter\expandafter\protected\fi
  \fi
  \csname#1def\endcsname#3%
}
\protected\def\pgfkeysrobustdef{\pgfkeys@starorlong{\pgfkeys@defcmd{}{p}}}
\pgfkeysrobustdef*\pgfkeysrobustgdef{\pgfkeys@starorlong{\pgfkeys@defcmd{g}{p}}}
\pgfkeysrobustdef*\pgfkeysnewdef{\pgfkeys@starorlong{\pgfkeys@defcmd{}{}}}
\pgfkeysrobustdef*\pgfkeysnewedef{\pgfkeys@starorlong{\pgfkeys@defcmd{e}{}}}
\pgfkeysrobustdef*\pgfkeysnewgdef{\pgfkeys@starorlong{\pgfkeys@defcmd{g}{}}}
\pgfkeysrobustdef*\pgfkeysrobustredef{\pgfkeys@starorlong{\pgfkeys@redefcmd{}{p}}}
\pgfkeysrobustdef*\pgfkeysnewredef{\pgfkeys@starorlong{\pgfkeys@redefcmd{}{}}}
\pgfkeysrobustdef*\pgfkeys@redefcmd#1#2#3{%
  \ifdefined#3%
    \ifpgfkeys@tracingkeys
      \immediate\write\m@ne{Command '\string#3' redefined}%
    \fi
  \fi
  \l@ngrel@x
  \ifcat$\detokenize{#2}$\else
    \ifx#2p\expandafter\expandafter\expandafter\protected\fi
  \fi
  \csname#1def\endcsname#3%
}

\pgfkeysrobustdef\pgfkeys@testst#1{%
  \ifpgfkeysstar{\pgfkeys@tempsttrue#1}{\pgfkeys@tempstfalse#1}%
}
\pgfkeysrobustdef\pgfkeys@testcl#1{%
  \ifpgfkeysnextchar!{\pgfkeys@cltrue#1}{\pgfkeys@clfalse#1}%
}
\pgfkeysrobustdef\pgfkeys@testpl#1{%
  \ifpgfkeysnextchar+{\pgfkeys@pltrue#1}{\pgfkeys@plfalse#1}%
}
% \pgfkeysnewlet shouldn't grab second argument!
\pgfkeysrobustdef*\pgfkeysnewlet#1{%
  \ifdefined#1%
    \pgfkeys@error{Command '\string#1' already exists}%
    \expandafter\pgfkeys@gobble
  \else
    \expandafter\pgfkeys@iofi
  \fi
  {\let#1 }%
}
\pgfkeysnewlet\pgfkeys@nil\relax
\pgfkeysnewdef\pgfkeys@cmdeq{\pgfkeys@gobble\pgfkeys@cmdeq}
\pgfkeysnewdef\ifpgfkeyscmdeq#1#2{%
  \ifx#1#2\pgfkeys@cmdeq\expandafter\pgfkeys@iofii\else
    \expandafter\pgfkeys@iiofii\fi
}
\pgfkeysnewdef\pgfkeys@gobble#1{}
\pgfkeysnewdef*\pgfkeys@space{ }
\edef\pgfkeys@backslashchar{\expandafter\pgfkeys@gobble\string\\}
\pgfkeysnewdef\pgfkeys@gobbletwo#1#2{}
\pgfkeysnewdef*\pgfkeys@stripprefix#1>{}
\pgfkeysnewdef\pgfkeys@car#1#2\car@nil{#1}
\lowercase{\pgfkeysnewdef*\pgfkeys@gobblespace} {}
\pgfkeysnewdef\pgfkeysswap#1#2{#2#1}
\pgfkeysnewdef\pgfkeysswapfirstbraced#1#2{#2{#1}}
\pgfkeysnewdef\pgfkeysexpandnext#1#2{%
  \expandafter\pgfkeysswap\expandafter{#2}{#1}%
}
\pgfkeysnewdef\pgfkeysexpandbracenext#1#2{%
  \expandafter\pgfkeysswap\expandafter{\expandafter{#2}}{#1}%
}
\pgfkeysrobustdef*\pgfkeyscsdef#1{\expandafter\def\csname#1\endcsname}
\pgfkeysrobustdef*\pgfkeyscsedef#1{\expandafter\edef\csname#1\endcsname}
\pgfkeysrobustdef*\pgfkeysnoexpandcs#1{%
  \unexpanded\expandafter{\csname#1\endcsname}%
}
\pgfkeysrobustdef*\pgfkeysexpandcsonce#1{%
  \unexpanded\expandafter\expandafter\expandafter{\csname#1\endcsname}%
}
\pgfkeysrobustdef\pgfkeysexpanded#1{\begingroup\edef\x{\endgroup#1}\x}
\pgfkeysrobustdef\pgfkeysexpandarg#1#2{%
  \begingroup\toks@{#1}%
  \pgfkeysexpanded{\endgroup\the\toks@{#2}}%
}
\pgfkeysrobustdef\pgfkeysexpandargonce#1#2{%
  \begingroup
  \toks@{#1}\toks1\expandafter{#2}%
  \pgfkeysexpanded{\endgroup\the\toks@{\the\toks1}}%
}
\pgfkeysrobustdef\pgfkeysexpandsecond#1#2{%
  \begingroup\toks@{#1}%
  \pgfkeysexpanded{\endgroup\the\toks@#2}%
}
\pgfkeysrobustdef\pgfkeysexpandsecondonce#1#2{%
  \begingroup
  \toks@{#1}\toks1\expandafter{#2}%
  \pgfkeysexpanded{\endgroup\the\toks@\the\toks1}%
}
\pgfkeysnewdef*\ifpgfkeysswitch#1{%
  \ifpgfkeysblank{#1}{%
    \pgfkeys@iiofii
  }{%
    \expandafter\pgfkeys@ifswitch\romannumeral-`\q#1\pgfkeys@nil{%
      \if#1\expandafter\pgfkeys@iofii\else\expandafter\pgfkeys@iiofii\fi
    }{%
      \pgfkeys@error{Invalid switch '#1'}%
    }%
  }%
}
\pgfkeysnewdef*\pgfkeys@ifswitch#1#2\pgfkeys@nil{%
  \ifpgfkeysblank{#2}\pgfkeys@iiofii\pgfkeys@iofii
}
\pgfkeysnewdef\ifpgfkeyscond#1\fi{%
  #1\relax\expandafter\pgfkeys@iofii\else
    \expandafter\pgfkeys@iiofii\fi
}
\pgfkeysnewdef*\ifpgfkeysnum#1#{\ifpgfkeyscond\ifnum#1\fi}
\pgfkeysrobustdef*\pgfkeys@in#1#2{%
  \long\def\in@@##1#1##2\in@@{%
    \edef\in@@{\unexpanded{##2}}%
    \ifx\in@@\pgfkeys@empty\pgfkeys@infalse\else\pgfkeys@intrue\fi
  }%
  \in@@#2{\in@@}#1\in@@
}
\pgfkeysrobustdef*\ifpgfkeysin#1#2{%
  \pgfkeys@in{#1}{#2}%
  \csname pgfkeys@\ifpgfkeys@in iofii\else iiofii\fi\endcsname
}
\pgfkeysrobustdef*\ifpgfkeysnotin#1#2{%
  \ifpgfkeysin{#1}{#2}\pgfkeys@iiofii\pgfkeys@iofii
}
\pgfkeysrobustdef*\ifpgfkeysxin#1#2{%
  \pgfkeys@expandtwoargs\ifpgfkeysin{#1}{#2}%
}
\pgfkeysrobustdef*\pgfkeys@expandtwoargs#1#2#3{%
  % #1 might be a token list:
  \begingroup\toks@{#1}%
  \edef\x{\endgroup\the\toks@{#2}{#3}}\x
}
\pgfkeysnewdef*\ifpgfkeysdef#1{%
  \ifpgfkeysblank{#1}\pgfkeys@iiofii{%
    \ifx#1\@undefined
      \expandafter\pgfkeys@iiofii
    \else
      \ifx#1\relax
        \expandafter\expandafter\expandafter\pgfkeys@iiofii
      \else
        \expandafter\expandafter\expandafter\pgfkeys@iofii
      \fi
    \fi
  }%
}
\pgfkeysnewdef*\ifpgfkeyscsdef#1{%
  \ifpgfkeysblank{#1}{%
    \expandafter\pgfkeys@iiofii\pgfkeys@gobble
  }{%
    \ifcsname#1\endcsname
      \expandafter\pgfkeys@iofi
    \else
      \expandafter\expandafter\expandafter
      \pgfkeys@iiofii\expandafter\pgfkeys@gobble
    \fi
  }{%
    \expandafter\ifpgfkeysdef\csname#1\endcsname
  }%
}
\pgfkeysnewdef*\ifpgfkeyskeydef#1{\ifpgfkeyscsdef{pgfk@#1}}
\pgfkeysnewredef*\pgfkeysifdefined#1{%
  \pgfkeys@ifcsname pgfk@#1\endcsname
    \expandafter\pgfkeys@iofii
  \else
    \expandafter\pgfkeys@iiofii
  \fi
}

% If you don't want to have \detokenize, here is rather lengthy way for
% \ifnull. Note that \ifnull defers from \ifblank:
\pgfkeysnewdef\ifpgfkeysnull#1#2#3{%
  \romannumeral\iffalse{\fi\expandafter\pgfkeys@iiofii\expandafter
  {\expandafter{\string#1}\expandafter\pgfkeys@iiofii\string}%
  \expandafter\pgfkeys@iofii\expandafter{\iffalse}\fi0 #3}{0 #2}%
}
%\pgfkeysnewdef\ifpgfkeysblank#1{%
%  \expandafter\ifpgfkeysnull\expandafter{\pgfkeys@gobble#1.}%
%}
\pgfkeysnewdef\ifpgfkeysblank#1{%
  \ifcat$\detokenize\expandafter{\pgfkeys@gobble#1.}$%
  \expandafter\pgfkeys@iofii\else\expandafter\pgfkeys@iiofii\fi
}
\pgfkeysnewdef*\ifpgfkeysbool#1{%
  \ifpgfkeysblank{#1}{%
    \pgfkeys@iiofii
  }{%
    \ifpgfkeyscsdef{if#1}{%
      \csname pgfkeys@i\csname if#1\endcsname ofii\else iofii\fi\endcsname
    }{%
      \pgfkeys@error{Undefined boolean '#1'}%
    }%
  }%
}
\pgfkeysrobustdef*\pgfkeysaftergroupdef#1\endgroup{%
  \edef\x{\endgroup\edef\noexpand#1{\noexpand\unexpanded
    {\unexpanded\expandafter{#1}}}}\x
}

\ifpgfkeysdef\pdfstrcmp{%
  \let\pgfkeys@strcmp\pdfstrcmp
}{%
  % Is it true that tikz doesn't load any external packages? If yes,
  % then we've to find another way around the need for 'pdftexcmds':
  \RequirePackage{pdftexcmds}%
  \ifpgfkeysdef\pdf@strcmp{%
    \let\pgfkeys@strcmp\pdf@strcmp
  }{%
    \pgfkeys@error{Neither '\string\pdfstrcmp' nor
      '\string\pdf@strcmp' could be found}%
  }%
}
\pgfkeysnewdef\ifpgfkeysstrcmp#1#2{%
  \csname pgfkeys@i\ifnum\pgfkeys@strcmp{\detokenize{#1}}%
    {\detokenize{#2}}=0ofii\else iofii\fi\endcsname
}
\pgfkeysnewdef\ifpgfkeysxstrcmp#1#2{%
  \csname pgfkeys@i\ifnum\pgfkeys@strcmp{#1}{#2}=0
    ofii\else iofii\fi\endcsname
}
\pgfkeysnewdef\ifpgfkeysbraced#1{%
  \ifpgfkeysblank{#1}\pgfkeys@iiofii{%
      \ifpgfkeysxstrcmp{\detokenize\expandafter{\pgfkeys@gobble#1}}{}{%
      \ifpgfkeysxstrcmp{\expandafter\pgfkeys@car\detokenize{#1}\car@nil}
      {\pgfkeys@leftbracechar}\pgfkeys@iofii\pgfkeys@iiofii
    }{%
      \pgfkeys@iiofii
    }%
  }%
}
\pgfkeysnewdef\ifpgfkeysleadspace#1#2#3{%
  \romannumeral\csname
  pgfkeys@i\ifpgfkeysnull{#1}{iofii}{\iffalse{\fi\pgfkeys@ifleadspace.#1 }}%
  \endcsname{0 #2}{0 #3}%
}
\pgfkeysnewdef\pgfkeys@ifleadspace#1 {% don't shift!
  \expandafter\ifpgfkeysnull\expandafter{\pgfkeys@gobble#1}{ofii}{iofii}%
  \expandafter\pgfkeys@gobble\expandafter{\iffalse}\fi
}
\pgfkeysrobustdef*\pgfkeys@sanitizemacro#1{%
  \edef#1{\expandafter\pgfkeys@stripprefix\meaning#1}%
}

\begingroup
\catcode`\&=7
\pgfkeysnewgdef\pgfkeystrimspace#1{\pgfkeys@trimspace@a.#1& &}
\pgfkeysnewgdef\pgfkeys@trimspace@a#1 &{\pgfkeys@trimspace@b#1&}
\pgfkeysnewgdef\pgfkeys@trimspace@b#1&#2{%
  \unexpanded\expandafter{%
    \romannumeral0%
    \expandafter\ifpgfkeysleadspace\expandafter{\pgfkeys@gobble#1}{%
      \pgfkeys@gobble#1%
    }{%
      \expandafter\space\pgfkeys@gobble#1%
    }%
  }%
}
\endgroup

\pgfkeysrobustdef\pgfkeysdespace#1#2{\edef#2{\pgfkeystrimspace{#1}}}
\pgfkeysrobustdef*\pgfkeysdespacecontent#1{%
  \edef#1{\expandafter\pgfkeystrimspace\expandafter{#1}}%
}
\pgfkeysnewdef*\pgfkeysgobblescape#1{%
  \ifpgfkeysblank{#1}{}{%
    \ifnum\escapechar>255
      \string#1%
    \else
      \ifnum\escapechar<0
        \string#1%
      \else
        \ifnum\escapechar=32
          \expandafter\pgfkeys@gobblespace\string#1%
        \else
          \expandafter\pgfkeys@gobble\string#1%
        \fi
      \fi
    \fi
  }%
}
\pgfkeysnewdef*\ifpgfkeysescaped#1{%
  \ifnum\escapechar>255
    \expandafter\pgfkeys@iiofii
  \else
    \ifnum\escapechar<0
      \expandafter\expandafter\expandafter\pgfkeys@iiofii
    \else
      \ifnum\escapechar=32
        \expandafter\expandafter\expandafter\expandafter
        \expandafter\expandafter\expandafter\pgfkeys@iiofii
      \else
        \csname pgfkeys@i\if\expandafter\pgfkeys@car\string#1x\@nil
        \pgfkeys@backslashchar ofii\else iofii\fi
        \expandafter\expandafter\expandafter\expandafter
        \expandafter\expandafter\expandafter
        \endcsname
      \fi
    \fi
  \fi
}
\pgfkeysnewdef\pgfkeys@alloftwo#1#2{#1#2}
\pgfkeysnewdef\ifpgfkeysntype#1{% Bruno Le Floch
  \ifpgfkeysxstrcmp
    {\detokenize\expandafter{\pgfkeys@alloftwo#1{}{}}}%
    {\detokenize{#1{}}}%
}

% Expandable test option. Use with caution: it can't be used to test
% for explicit braces!
% Examples:
% {
%   \catcode`\ =13
%   \gdef\activespace{ }
% }
% \def\cmd[#1]{}
% \def\x{\pgfkeys@xtestopt\cmd{noarg}}
% \x {xy}
% \x [arg] {xy}
% \expandafter\x \activespace {xy}
% \expandafter\x \activespace [arg] {xy}

\pgfkeysnewdef*\pgfkeys@xtestopt#1#2#3{%
  \ifpgfkeysstrcmp{ }{#3}{%
    \pgfkeys@xtestopt#1{#2}%
  }{%
    \ifpgfkeysstrcmp{#3}{[}
      {#1[}{\ifpgfkeysntype{#3}{#1[#2]#3}{#1[#2]{#3}}}%
  }%
}

% This can't be used to test for the presence of explicit left or right brace.
\pgfkeysnewdef*\ifpgfkeysxifnextchar#1#2#3#4{%
  \ifpgfkeysstrcmp{ }{#4}{%
    \ifpgfkeysxifnextchar#1{#2}{#3}%
  }{%
    \ifpgfkeysstrcmp{#4}{#1}{#2}{\ifpgfkeysntype{#4}{#3#4}{#3{#4}}}%
  }%
}

% \pgfkeysremoveouterbraces[<no of braces to remove>]{<token>}
% To make the test expandable, we need to use expandable testopt.
\pgfkeysnewdef*\pgfkeysremoveouterbraces{%
  \pgfkeys@xtestopt\pgfkeys@removeouterbraces{1}%
}
\pgfkeysnewdef*\pgfkeys@removeouterbraces[#1]{%
  \romannumeral\expandafter\pgfkeys@r@moveouterbraces\expandafter{%
    \romannumeral\ifpgfkeysxstrcmp{\pgfkeystrimspace{#1}}{all}{1000}{#1}000%
  }%
}
\pgfkeysnewdef\pgfkeys@r@moveouterbraces#1#2{%
  \ifpgfkeysblank{#1}{0 \unexpanded{#2}}{%
    \expandafter\ifpgfkeysblank\expandafter{\pgfkeys@gobble#2}{%
      \ifpgfkeysbraced{#2}{%
        \expandafter\pgfkeysswapfirstbraced\expandafter{\pgfkeys@iofi#2}%
        {\expandafter\pgfkeys@r@moveouterbraces\expandafter{\pgfkeys@gobble#1}}%
      }{0 \unexpanded{#2}}%
    }{0 \unexpanded{#2}}%
  }%
}

\pgfkeysrobustdef*\pgfkeyscsvnormalize{\pgfkeys@testopt\pgfkeys@csvnormalize,}
\pgfkeysrobustdef\pgfkeys@csvnormalize[#1]#2{%
  \begingroup
  \pgfkeysdeclarenormalizer{#1}%
  \@tempswafalse
  \pgfkeys@normalizelist{#2}%
  \expandafter\endgroup\expandafter\pgfkeys@temptoks\expandafter
    {\the\pgfkeys@temptoks}%
}
\pgfkeysrobustdef\pgfkeyskvnormalize#1{%
  \begingroup
  \pgfkeysdeclarenormalizer{,}%
  \@tempswatrue
  \pgfkeys@normalizelist{#1^?^}%
  \def\reserved@a##1^?^##2\pgfkeys@nil{%
    \pgfkeys@parserequalerr##1##2,=\pgfkeys@nil
    \pgfkeys@temptoks{##1##2}%
  }%
  \expandafter\reserved@a\the\pgfkeys@temptoks\pgfkeys@nil
  \expandafter\endgroup\expandafter\pgfkeys@temptoks\expandafter
    {\the\pgfkeys@temptoks}%
}
\pgfkeysrobustdef\pgfkeysslashnormalize#1{%
  \pgfkeys@csvnormalize[/]{x#1}%
  \pgfkeys@temptoks\expandafter\expandafter\expandafter
  \expandafter\expandafter\expandafter\expandafter
  {\expandafter\expandafter\expandafter\noexpand\expandafter
  \pgfkeys@gobble\the\pgfkeys@temptoks}%
}

% A general list normalizer, for arbitrary list parsers:
\begingroup
\catcode`\~=13
\catcode`\!=13
\pgfkeysrobustgdef*\pgfkeysdeclarenormalizer#1{%
  \begingroup
  \lccode`\~=`#1%
  \lccode`\!=`\=%
  \lowercase{\endgroup
    \def\pgfkeys@normalizelist##1{%
      \pgfkeys@temptoks\expandafter{\romannumeral-`\q
        \pgfkeys@activeparser#1##1#1~\pgfkeys@nil}%
    }%
    \def\pgfkeys@activeparser##1~##2\pgfkeys@nil{%
      \ifpgfkeysblank{##2}{%
        \ifpgfkeysbool{@tempswa}{%
          \pgfkeys@activeequal##1!\pgfkeys@nil
        }{%
          \pgfkeys@spaceparser##1 #1\pgfkeys@nil
        }%
      }{%
        \pgfkeys@activeparser##1#1##2\pgfkeys@nil
      }%
    }%
  }%
  \begingroup
  \uccode`\~=`\=%
  \uppercase{\endgroup
    \def\pgfkeys@activeequal##1~##2\pgfkeys@nil{%
      \ifpgfkeysblank{##2}{%
        \pgfkeys@spaceparser##1 #1\pgfkeys@nil
      }{%
        \pgfkeys@activeequal##1=##2\pgfkeys@nil
      }%
    }%
  }%
  \def\pgfkeys@spaceparser##1 #1##2\pgfkeys@nil{%
    \ifpgfkeysblank{##2}{%
      \pgfkeys@parserspace##1#1 \pgfkeys@nil
    }{%
      \pgfkeys@spaceparser##1#1##2\pgfkeys@nil
    }%
  }%
  \def\pgfkeys@parserspace##1#1 ##2\pgfkeys@nil{%
    \ifpgfkeysblank{##2}{%
      \ifpgfkeysbool{@tempswa}{%
        \pgfkeys@spaceequal##1 =\pgfkeys@nil
      }{%
        \pgfkeys@doubleparser##1#1#1\pgfkeys@nil
      }%
    }{%
      \pgfkeys@parserspace##1#1##2\pgfkeys@nil
    }%
  }%
  \def\pgfkeys@spaceequal##1 =##2\pgfkeys@nil{%
    \ifpgfkeysblank{##2}{%
      \pgfkeys@equalspace##1= \pgfkeys@nil
    }{%
      \pgfkeys@spaceequal##1=##2\pgfkeys@nil
    }%
  }%
  \def\pgfkeys@equalspace##1= ##2\pgfkeys@nil{%
    \ifpgfkeysblank{##2}{%
      \pgfkeys@doubleparser##1#1#1\pgfkeys@nil
    }{%
      \pgfkeys@equalspace##1=##2\pgfkeys@nil
    }%
  }%
  \def\pgfkeys@doubleparser##1#1#1##2\pgfkeys@nil{%
    \ifpgfkeysblank{##2}{%
      \ifpgfkeysbool{@tempswa}{%
        \pgfkeys@doubleequal##1==\pgfkeys@nil
      }{%
        \ifpgfkeysblank{##1}{}{%
          \pgfkeys@remleadparser##1\pgfkeys@nil
        }%
      }%
    }{%
      \pgfkeys@doubleparser##1#1##2\pgfkeys@nil
    }%
  }%
  \def\pgfkeys@doubleequal##1==##2\pgfkeys@nil{%
    \ifpgfkeysblank{##2}{%
      \ifpgfkeysblank{##1}{}{%
        \pgfkeys@remleadparser##1\pgfkeys@nil
      }%
    }{%
      \pgfkeys@doubleequal##1=##2\pgfkeys@nil
    }%
  }%
  \def\pgfkeys@remleadparser#1##1\pgfkeys@nil{%
    \expandafter\space\noexpand##1%
  }%
  \def\pgfkeys@parserequalerr##1#1=##2\pgfkeys@nil{%
    \ifpgfkeysblank{##2}{}{%
      \pgfkeys@error{There is '#1=' in your key-value list}%
    }%
  }%
}
\endgroup

% I haven't studied all of pgf/tikz's looping macros, but we may sometimes
% need to break out of the loop prematurely.
% Example:
% \pgfkeysdeclarelistparser\myloop{,}
% \chardef\nr=0
% \myloop{a,b,c}\temp{%
%   \edef\nr{\the\numexpr\nr+1}%
%   \ifnum\nr=2 \pgfkeysloopbreak\fi % use only a,b
%   \edef\y#1{#1\temp}%
% }
\pgfkeysnewlet\pgfkeysloopbreak\pgfkeysloopbreaktrue
\pgfkeysnewdef*\pgfkeys@listparser@nil{\pgfkeys@listparser@nil}
\pgfkeysrobustdef*\pgfkeysdeclarelistparser#1#2{%
  \pgfkeysrobustdef#1##1##2##3{%
    \pgfkeys@csvnormalize[#2]{##1}%
    \edef##2{\the\pgfkeys@temptoks}%
    \ifpgfkeyscmdeq##2\pgfkeys@empty{}{%
      \pgfkeysexpandnext{%
        \csname pgfkeys@listparser@\pgfkeysgobblescape#1\endcsname
        ##2{##3}%
      }##2#2\pgfkeys@listparser@nil#2%
    }%
  }%
  \pgfkeyscsdef{pgfkeys@listparser@\pgfkeysgobblescape#1}##1##2##3#2{%
    \pgfkeys@temptoks{##3}%
    \edef##1{\the\pgfkeys@temptoks}%
    \ifpgfkeyscmdeq##1\pgfkeys@listparser@nil{}{%
      ##2\relax
      \ifpgfkeysloopbreak
        % To allow nesting of loop:
        \pgfkeysloopbreakfalse
        \begingroup
        \pgfkeyscsdef{pgfkeys@listparser@\pgfkeysgobblescape#1}%
          ####1\pgfkeys@listparser@nil#2{%
          \endgroup
          \pgfkeys@temptoks{####1}%
          \edef\pgfkeysremainder{\the\pgfkeys@temptoks}%
        }%
      \fi
      \csname pgfkeys@listparser@\pgfkeysgobblescape#1\endcsname##1{##2}%
    }%
  }%
  % <#1@e> is like #1 but will execute <callback> once when
  % <list> is empty:
  \expandafter\pgfkeysrobustdef
  \csname\pgfkeysgobblescape#1@e\endcsname##1##2##3{%
    \pgfkeys@csvnormalize[#2]{##1}%
    \begingroup
    \toks@{\csname pgfkeys@listparser@\pgfkeysgobblescape#1\endcsname##2{##3}}%
    \expandafter\endgroup\the\expandafter\toks@
    \the\pgfkeys@temptoks#2\pgfkeys@listparser@nil#2%
  }%
}
\pgfkeysdeclarelistparser\pgfkeyscommaloop{,}

% \pgfkeysnewbools[<prefix>]{<boolean list>}
\pgfkeysrobustdef*\pgfkeysnewbools{\pgfkeys@testopt\pgfkeys@newbools{}}
\pgfkeysrobustdef*\pgfkeys@newbools[#1]#2{%
  \pgfkeyscommaloop{#2}\pgfkeys@tempa{%
    \ifpgfkeyscsdef{if#1\pgfkeys@tempa}{%
      \pgfkeysnoexpandcs{if#1\pgfkeys@tempa}%
      \pgfkeys@err{Boolean '\the\pgfkeys@temptoks'
        already exists}%
    }{%
      \expandafter\newif\csname if#1\pgfkeys@tempa\endcsname
    }%
  }%
}
\pgfkeysnewbools[pgfkeys@]{cl,pl}

\pgfkeysrobustdef*\pgfkeys@trimsuffixcomma{%
  \begingroup
  \def\pgfkeys@tempa{%
    \edef\reserved@a{\the\pgfkeys@temptoks}%
    \pgfkeys@sanitizemacro\reserved@a
    \ifpgfkeysxin{,\pgfkeys@nil}{\reserved@a\pgfkeys@nil}{%
      \def\reserved@a####1,\pgfkeys@nil{%
        \pgfkeys@temptoks{####1}\pgfkeys@tempa
      }%
      \expandafter\reserved@a\the\pgfkeys@temptoks\pgfkeys@nil
    }{}%
  }%
  \pgfkeys@tempa
  \expandafter\endgroup\expandafter\pgfkeys@temptoks\expandafter
    {\the\pgfkeys@temptoks}%
}

\pgfkeysrobustredef\pgfkeys@@set#1#2{%
  \let\pgfkeysdefaultpath\pgfkeys@root
  \pgfkeys@set@aux{#1}{#2}%
}
% \pgfkeys@set@aux is also needed by \pgfkeys@@qset:
\pgfkeysrobustdef\pgfkeys@set@aux#1#2{%
  \pgfkeysslashnormalize{#2}%
  \expandafter\pgfkeyskvnormalize\expandafter{\the\pgfkeys@temptoks}%
  \pgfkeys@trimsuffixcomma
  \expandafter\pgfkeys@parse\the\pgfkeys@temptoks,\pgfkeys@mainstop
  \def\pgfkeysdefaultpath{#1}%
}
\pgfkeysrobustredef\pgfkeys@normal#1,{%
  \pgfkeys@unpack@a#1=\pgfkeysnovalue=\pgfkeys@stop
  \pgfkeys@parse
}
\pgfkeysrobustdef\pgfkeys@unpack@a#1={%
  % No need to despace #1: the list was previously normalized.
  \edef\pgfkeyscurrentkey{#1}%
  \ifpgfkeysbool{pgfkeys@preservebrace}{%
    \pgfkeys@unpack@b\do
  }{%
    \pgfkeys@unpack@b
  }%
}
\pgfkeysrobustdef\pgfkeys@unpack@b#1=#2\pgfkeys@stop{%
  % No need to despace #1 here.
  \ifpgfkeys@preservebrace
    \pgfkeys@temptoks\expandafter{\pgfkeys@gobble#1}%
  \else
    \pgfkeys@temptoks{#1}%
  \fi
  % This solution is useful but it isn't yet foolproof because of the way
  % the original pgfkeys package delimits arguments by \pgfeov.
  % Robustifying this stage will require changes to pgfkeys' style of
  % argument grabbing.
  \edef\pgfkeyscurrentvalue{%
    \ifpgfkeys@preservebrace
      \expandafter\ifpgfkeysbraced\expandafter{\the\pgfkeys@temptoks}{%
        {\the\pgfkeys@temptoks}%
      }{%
        \the\pgfkeys@temptoks
      }%
    \else
      \the\pgfkeys@temptoks
    \fi
  }%
  % Using LaTeX-style branches can help offset problems often found with
  % parsing unbalanced conditionals.
  \ifpgfkeyscmdeq\pgfkeyscurrentkey\pgfkeys@empty{%
    % OK, just skip
  }{%
    \pgfkeys@add@path@as@needed
    \ifpgfkeyscmdeq\pgfkeyscurrentvalue\pgfkeysnovalue@text{%
      \pgfkeysifdefined{\pgfkeyscurrentkey/.@def}{%
        \pgfkeysgetvalue{\pgfkeyscurrentkey/.@def}\pgfkeyscurrentvalue
      }{%
        % Proposal:
        % If there is no user value and no default, we should check if
        % their is an handler for the name of this key or if value is
        % forbidden. If nothing is found, we should alert the user.
        % To reduce the cost of checking, this should be based on user
        % preference.
      }%
    }{}%
    \ifpgfkeyscmdeq\pgfkeyscurrentvalue\pgfkeysvaluerequired{%
      \pgfkeysvalueof{/errors/value required/.@cmd}\pgfkeyscurrentkey
        \pgfkeyscurrentvalue\pgfeov
    }{%
      \pgfkeys@case@one
    }%
  }%
}

\pgfkeysrobustredef\pgfkeysalso#1{%
  % First strip all outer brace of #1; otherwise parsing may fail.
  \edef\pgfkeys@tempa{\pgfkeysremoveouterbraces[all]{#1}}%
  \expandafter\pgfkeysslashnormalize\expandafter{\pgfkeys@tempa}%
  \expandafter\pgfkeyskvnormalize\expandafter{\the\pgfkeys@temptoks}%
  \pgfkeys@trimsuffixcomma
  \expandafter\pgfkeys@parse\the\pgfkeys@temptoks,\pgfkeys@mainstop
}

% No change to the original \pgfqkeys, but \pgfkeys@@qset requires patching:
\pgfkeysrobustredef*\pgfqkeys{%
  \expandafter\pgfkeys@@qset\expandafter{\pgfkeysdefaultpath}%
}
\pgfkeysrobustredef\pgfkeys@@qset#1#2#3{%
  \pgfkeysexpandarg\pgfkeysslashnormalize{#2}%
  \expandafter\pgfkeyskvnormalize\expandafter{\the\pgfkeys@temptoks}%
  \edef\pgfkeysdefaultpath{\the\pgfkeys@temptoks/}%
  \pgfkeys@set@aux{#1}{#3}%
}
% \pgfqkeysalso also needs to call the list normalizer:
\pgfkeysrobustredef\pgfqkeysalso#1#2{%
  \pgfkeysexpandarg\pgfkeysslashnormalize{#1}%
  \expandafter\pgfkeyskvnormalize\expandafter{\the\pgfkeys@temptoks}%
  \edef\pgfkeysdefaultpath{\the\pgfkeys@temptoks/}%
  \pgfkeysalso{#2}%
}

\pgfkeysnewdef*\pgfkeys@generateparameters#1#2{%
  \ifnum#1<\numexpr#2+1\relax ####\number#1%
    \expandafter\pgfkeys@generateparameters
    \expandafter{\number\numexpr#1+1\expandafter}%
    \expandafter{\number#2\expandafter}%
  \fi
}
\pgfkeysnewredef\pgfkeysdefnargs#1#2#3{\pgfkeysdefnargs@{#1}{#2}{#3}{\def}}
\pgfkeysnewredef\pgfkeysedefnargs#1#2#3{\pgfkeysdefnargs@{#1}{#2}{#3}{\edef}}
\pgfkeysnewredef\pgfkeysdefnargs@#1#2#3#4{%
  \ifnum#2>9\relax
    \pgfkeys@error{\string\pgfkeysdefnargs:
      I expected #2<=9 arguments but I saw #2}%
  \else
    \pgfkeyscsedef{pgfk@#1/.@args}{\pgfkeys@generateparameters{1}{#2}}%
  \fi
  \pgfkeysgetvalue{#1/.@args}\pgfkeys@tempargs
  \def\pgfkeys@temp{\expandafter#4\csname pgfk@#1/.@@body\endcsname}%
  \expandafter\pgfkeys@temp\pgfkeys@tempargs{#3}%
  \edef\pgfkeys@tempargs{\noexpand\pgfkeysvalueof{#1/.@@body}}%
  \def\pgfkeys@temp{\pgfkeysdef{#1}}%
  \expandafter\pgfkeys@temp\expandafter{\pgfkeys@tempargs##1}%
  \pgfkeyssetvalue{#1/.@body}{#3}%
}

\pgfkeys{%
  % Use default values to set the key. If the key has no default or
  % if value is required, an error will be raised:
  /handlers/.restore default/.code=\pgfkeys{\pgfkeyscurrentpath}%
}
\pgfkeys{%
  /handlers/.restore key defaults/.code=\pgfkeysalso{#1}%
}
\pgfkeys{/handlers/.normal code/.code=#1}

% New handlers for boolean keys:
% Syntaxes:
% <key>.is if with no callback=<default>
% <key>.is if with 1 callback={<default>}{<callback>}
% <key>.is if with 2 callbacks={<default>}{<callback-1>}{<callback-2>}
% In this way, I know I am dealing with <key>, and not with another
% (auxiliary) boolean as in conventional '.is if' handler.
\pgfkeys{%
  /handlers/.is if with no callback/.code={%
    \pgfkeys@boolean@handler{#1}{##1}{}{}%
  },
  /handlers/.is if with 1 callback/.code 2 args={%
    \pgfkeys@boolean@handler{#1}{##1}{#2}{}%
  },
  /handlers/.is if with one callback/.style 2 args={%
    \pgfkeyscurrentpath/.is if with 1 callback={#1}{#2}%
  },
  /handlers/.is if with 2 callbacks/.code n args={3}{%
    \pgfkeys@boolean@handler{#1}{##1}{#2}{#3}%
  }
}
\pgfkeysrobustredef*\pgfkeys@savresname#1{%
  \ifcase#1\relax
    % The idea is, for a given key '/my path/key/.code', to set
    % path := '/my path'
    % name := 'key/.code'
    % key := '/my path/key/.code'
    \let\pgfkeyssavedkey=\pgfkeyscurrentkey
	  \let\pgfkeyssavedname=\pgfkeyscurrentname
    \edef\pgfkeyssavedpath{\pgfkeyscurrentpath}%
    \edef\pgfkeyscurrentkey{\pgfkeyscurrentpath}%
    \pgfkeys@split@path
    \let\pgfkeyssavednameb\pgfkeyscurrentname
  \or
    % Recover:
    \let\pgfkeyscurrentkey=\pgfkeyssavedkey
	  \let\pgfkeyscurrentname=\pgfkeyssavedname
    % Don't do \edef\pgfkeyscurrentpath{\pgfkeyssavedpath} here, since
    % \pgfkeyscurrentpath is determined by \pgfkeys@pathtoks.
  \else
    \pgfkeys@error{Number '#1' out of range [0,1]}%
  \fi
}
\pgfkeysrobustredef\pgfkeys@boolean@handler#1#2#3#4{%
  \pgfkeys@savresname{0}%
  % Let's not redefine 'if\pgfkeyscurrentname' is it already exists,
  % so that we don't change its current state:
  \ifpgfkeyscsdef{if\pgfkeyscurrentname}{}{%
    % Can use \outer-defined \newif:
    \csname newif\expandafter\endcsname
    \csname if\pgfkeyscurrentname\endcsname
  }%
  \begingroup
  \def\reserved@a{\pgfkeyssavedpath/.code=}%
  \expandafter\expandafter\expandafter\endgroup\expandafter\expandafter
  \expandafter\pgfkeysalso\expandafter\expandafter\expandafter{%
    \expandafter\reserved@a\expandafter\pgfkeys@boolean@handler@b
      \expandafter{\pgfkeyssavednameb}{#2}{#3}{#4},
    \pgfkeyssavedpath/.default=#1%
  }%
  \pgfkeys@savresname{1}%
}
\pgfkeysrobustredef\pgfkeys@boolean@handler@b#1#2#3#4{%
  \ifpgfkeysxin{,\pgfkeystrimspace{#2},}{,true,false,}{%
    \ifpgfkeyscsdef{#1#2}{%
      \csname#1#2\endcsname
      \ifpgfkeysblank{#3#4}{}{\ifpgfkeysbool{#1}{#3}{#4}}%
    }{%
      \pgfkeysvalueof{/errors/boolean expected/.@cmd}%
        \pgfkeyscurrentkey{#2}\pgfeov
    }%
  }{%
    \pgfkeysvalueof{/errors/boolean expected/.@cmd}%
      \pgfkeyscurrentkey{#2}\pgfeov
  }%
}

\pgfkeys@restorecodes
\endinput

%% End of file 'pgfkeyx.sty' %%