1 files changed, 912 insertions, 0 deletions
diff --git a/macros/latex/contrib/pgfkeyx/pgfkeyx.sty b/macros/latex/contrib/pgfkeyx/pgfkeyx.sty
new file mode 100644
index 0000000000..d29eb4fcf1
--- /dev/null
+++ b/macros/latex/contrib/pgfkeyx/pgfkeyx.sty
@@ -0,0 +1,912 @@
+%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%
+%                                                                          %
+% 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' %%