%%
%% This is file 'bxtoolbox.def'.
%%

%% file declaration
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile{bxtoolbox.def}[2023/02/23 v1.2a]
\providecommand*\bxtb@pkgname{BXtoolbox}% bundle name

%% check intergrity
\edef\bxtb@tmpa{\@currname.\@currext}\def\bxtb@tmpb{bxtoolbox.def}
\ifx\bxtb@tmpa\bxtb@tmpb\else
  \PackageError\bxtb@pkgname{Illegal load sequence}\@eha
\expandafter\endinput\fi\relax

%% code guards
\edef\bxtb@restore@codes{%
  \catcode33=\the\catcode33%
  \catcode34=\the\catcode34%
  \catcode39=\the\catcode39%
  \catcode45=\the\catcode45%
  \catcode46=\the\catcode46%
  \catcode47=\the\catcode47%
  \catcode58=\the\catcode58%
  \catcode60=\the\catcode60%
  \catcode62=\the\catcode62%
  \catcode63=\the\catcode63%
  \catcode96=\the\catcode96%
\relax}
\catcode33=12 % <!>
\catcode34=12 % <">
\catcode39=12 % <'>
\catcode45=12 % <->
\catcode46=12 % <.>
\catcode47=12 % </>
\catcode58=12 % <:>
\catcode60=12 % <<>
\catcode62=12 % <>>
\catcode63=12 % <?>
\catcode96=12 % <`>
\AtEndOfPackage{%
  \bxtb@restore@codes
  \let\bxtb@restore@codes\@undefined}

%--------------------------------------- 0. Prologue

%% variables
\newif\ifbxOk       % general-purpose switch
\let\bxRes\relax    % result container

%% unique tokens
\def\bxtb@uniq{\bxtb@uniq@}

%% error messages
\def\bxtb@error{\PackageError\bxtb@pkgname}
\def\bxtb@warn{\PackageWarningNoLine\bxtb@pkgname}

%--------------------------------------- 1. Engine-independent stuffs

%% \bxtb@@bs
\let\bxtb@@bs\@backslashchar

%%<+> \bxIfcsundefX{<csname>}{<T>}{<F>}
\newcommand*\bxIfcsundefX{}
\let\bxIfcsundefX\@ifundefined

%%<+> \bxCsuseX{<csname>}
\newcommand*\bxCsuseX[1]{%
  \@ifundefined{#1}{}{\csname#1\endcsname}}

%% \bxtb@listmake@do
\def\bxtb@listmake@do{\let\do\bxtb@lm@do}
\def\bxtb@lm@do{\noexpand\do\noexpand}
\def\bxtb@csdo#1{\expandafter\do\csname#1\endcsname}

%% \bxtb@letcs\CSA{<csnameB>}
%% \bxtb@cslet{<csnameA>}\CSB
%% \bxtb@csletcs{<csnameA>}{<csnameB>}
% Same as \letcs, \cslet, \csletcs in etoolbox.
% They are defined here since subsequent stuffs use them.
\def\bxtb@letcs#1#2{%
  \expandafter\let\expandafter#1\csname #2\endcsname}
\def\bxtb@cslet#1#2{%
  \expandafter\let\csname #1\endcsname#2}
\def\bxtb@csletcs#1#2{%
  \expandafter\let\csname #1\expandafter\endcsname\csname #2\endcsname}

%% \bxtb@ifprimitive\CS{<T>}{<F>}
% Core of \bxIfPrimitive.
\def\bxtb@ifprimitive#1{%
  \edef\bxtb@tmpa{\string#1}\edef\bxtb@tmpb{\meaning#1}%
  \ifx\bxtb@tmpa\bxtb@tmpb \expandafter\@firstoftwo
  \else \expandafter\@secondoftwo \fi}

%% \bxtb@ifstrempty{<str>}{<T>}{<F>}
% Core of \ifstrempty.
\def\bxtb@ifstrempty#1{%
  \ifx\bxtb@empty@uniq#1\bxtb@empty@uniq
    \expandafter\@firstoftwo
  \else \expandafter\@secondoftwo \fi}
\def\bxtb@empty@uniq{\bxtb@empty@uniq@}

%%<+> \ifbxineTeX (if-token)
%%<+> \bxIfineTeX{<T>}{<F>}
%%<+> \ifbxinpdfTeX / \ifbxinLuaTeX / \ifbxinOmega / \ifbxinAleph
%%<+> \ifbxinXeTeX / \ifbxinpTeX / \ifbxinupTeX / \ifbxinjTeX
%%<+> \bxIfinpdfTeX / \bxIfinLuaTeX / \bxIfinOmega / \bxIfinAleph
%%<+> \bxIfinXeTeX / \bxIfinpTeX / \bxIfinupTeX / \bxIfinjTeX
%% Engine check.
\def\bxtb@do#1#2{%
  \bxtb@ifprimitive#2%
  {\let\bxtb@tmpa\@firstoftwo}{\let\bxtb@tmpa\@secondoftwo}%
  \bxtb@cslet{bxIfin#1}\bxtb@tmpa
  \bxtb@csletcs{ifbxin#1}{if\bxtb@tmpa{true}{false}}}
\bxtb@do{eTeX}{\eTeXversion}
\bxtb@do{pdfTeX}{\pdftexversion}
\bxtb@do{LuaTeX}{\luatexversion}
\bxtb@do{Omega}{\OmegaVersion}
\bxtb@do{Aleph}{\AlephVersion}
\bxtb@do{XeTeX}{\XeTeXversion}
\bxtb@do{pTeX}{\kanjiskip}
\bxtb@do{upTeX}{\enablecjktoken}
\bxtb@do{jTeX}{\jintercharskip}

%%<+> \ifbxinnativeupTeX / bxIfinnativeupTeX
% Checks if upTeX with kanji-internal=uptex is used.
\bxtb@do{nativeupTeX}{\bxtb@uniq}
\ifbxinupTeX \ifnum\ucs"3000="3000 \bxtb@do{nativeupTeX}{\ucs}\fi\fi

%%<+> \bxPreamble\CSX[*]\CSY
% Prefix used for preamble-only commands.
% \CSX can be \def, \newcommand, \DeclareRobustCommand, etc.
\@onlypreamble\bxPreamble
\newcommand*\bxPreamble[2]{%
  \ifx *#2\def\bxtb@args{{#1*}}%
  \else \def\bxtb@args{#1#2}%
  \fi \expandafter\bxtb@preamble@a\bxtb@args}
\@onlypreamble\bxtb@preamble@a
\def\bxtb@preamble@a#1#2{%
  \@onlypreamble#2#1#2}

%%<+> \bxConstBool
\newcommand*\bxConstIfToken[2]{%
  \bxtb@cslet{if#1}{if#2}}

%% \bxtb@skip@new@cmd...{<text>}
% Gobbles a following whole macro definition sentence.
\def\bxtb@skip@new@cmd#1#{\@gobble}

%% \bxtb@name@cs\CS
\def\bxtb@name@cs{%
  \expandafter\bxtb@name@cs@a\string\$\@gobble\@empty\@nil}
\def\bxtb@name@cs@a#1#2#3#4\@nil#5{%
  \expandafter#3\string#5}

%% \bxtb@let@name\CSX\CSY
\def\bxtb@let@name#1#2{%
  \edef#1{\bxtb@name@cs#2}}

%%<+> \bxIf{<test>}{<T>}{<F>}
%%<+> \bxIfcat{<test>}{<T>}{<F>}
%%<+> \bxIfx{<test>}{<T>}{<F>}
%%<+> \bxIfdim{<test>}{<T>}{<F>}
%%<+> \bxIfnum{<test>}{<T>}{<F>}
% Primitive if-tests rendered in LaTeX format.
\let\bxtb@bumper\noindent % primitive other than \relax
\bxPreamble\def\bxtb@defifmacro@noarg#1#2#3{%
  \@gobble{\if}% if-match hack
  \def#1{#2\expandafter\@firstoftwo
    \else\expandafter\@secondoftwo\fi}}
\bxPreamble\def\bxtb@defifmacro#1#2#3{%
  \@gobble{\if}% if-match hack
  \def#1##1{#2##1\expandafter\@firstoftwo
    \else\expandafter\@secondoftwo\fi}}
\bxPreamble\def\bxtb@defifmacro@val#1#2#3{%
  \@gobble{\if}% if-match hack
  \def#1##1{\expandafter\@gobble
    #2##1\bxtb@bumper\expandafter\@firstoftwo
    \else \bxtb@bumper\expandafter\@secondoftwo \fi}}
\bxtb@defifmacro\bxIf\if\fi
\bxtb@defifmacro\bxIfcat\ifcat\fi
\bxtb@defifmacro\bxIfx\ifx\fi
\bxtb@defifmacro@val\bxIfdim\ifdim\fi
\bxtb@defifmacro@val\bxIfnum\ifnum\fi

%%<+> \bxIfInMovingArg{<T>}{<F>}
% Moving argument check. Note that it actually expands to <T> or
% <F> prepended with some unexpandable garbles with no effect.
% For that reason, this macro is not suitable for switching
% implementation. Instead it is intended for error check for
% use in moving arguments.
\long\def\bxIfInMovingArg#1#2{%
  \let\bxtb@ifinmovarg@a\bxtb@ifinmovarg@a\bxtb@ifinmovarg@c{#1}%
  #2\bxtb@ifinmovarg@end}
\def\bxtb@ifinmovarg@a#1{%
  \bxtb@ifinmovarg@dummy\relax \bxtb@ifinmovarg@b}
\def\bxtb@ifinmovarg@b#1#2#3\bxtb@ifinmovarg@end{#2}
\def\bxtb@ifinmovarg@c#1#2\bxtb@ifinmovarg@end{#2}
\let\bxtb@ifinmovarg@end\@empty
\let\bxtb@ifinmovarg@dummy\relax

%%<+> \bxMessageToken{<str>}{<text>}
% Executes <text> where #1 is replaced by control sequence \<str>.
% The meaning of \<str> is unchanged.
% (In <text> # must be doubled.)
\def\bxMessageToken#1{%
  \begingroup
    \xdef\bxtb@g@tmpa{\noexpand\bxtb@tmpa
      \expandafter\noexpand\csname #1\endcsname}%
  \endgroup
  \afterassignment\bxtb@g@tmpa \long\def\bxtb@tmpa##1}

%%<+> \bxCheckForMovingArg{<text>}
% When in moving arguments, it raises an error in the form of
% undefined conrol sequence; otherwise expands to <text>.
%%<+> \bxCheckForMovingArgForTest{\SOMETEST{<arg>}}{<T>}{<F>}
% When in moving arguments, it raises an error in the form of
% undefined conrol sequence and expands to <F>; otherwise
% it expands to \SOMETEST{<arg>}{<T>}{<F>}.
\bxMessageToken{ ERROR: Use in wrong place!}{%
  \def\bxCheckForMovingArg{\bxIfInMovingArg{#1}}%
  \def\bxCheckForMovingArgForTest{%
    \bxIfInMovingArg{#1\@secondoftwo}}%
}

%% \bxtb@ifnewdefok\CS{<T>}{<F>}
%% \bxtb@ifrenewdefok\CS{<T>}{<F>}
%% \bxtb@ifprovidedefok\CS{<T>}{<F>}
\def\bxtb@ifnewdefok#1{%
  \newcommand#1{\bxtb@uniq}\bxtb@ifnewdefok@a#1}
\def\bxtb@ifrenewdefok#1{% <F> is never executed
  \renewcommand#1{\bxtb@uniq}\let#1\@undefined \@firstoftwo}
\def\bxtb@ifprovidedefok#1{%
  \providecommand#1{\bxtb@uniq}\bxtb@ifnewdefok@a#1}
\def\bxtb@ifnewdefok@a#1{%
  \ifx#1\bxtb@ifdefok@probe
    \let#1\@undefined \expandafter\@firstoftwo
  \else \expandafter\@secondoftwo
  \fi}
\long\def\bxtb@ifdefok@probe{\bxtb@uniq}

%% \bxtb@detokenize{<text>}
% Resource consuming version of \detokenize ;)
%% \bxtb@stringify{<text>}
% Expands <text> and then detokenizes the result.
\def\bxtb@detokenize{%
  \romannumeral-`a\bxtb@detok@pre@a\bxtb@detok@lop@a}
\def\bxtb@stringify{%
  \romannumeral-`a\bxtb@detok@pre@a\bxtb@edetok@lop@a}
\def\bxtb@detok@pre@a#1#2{%
  \expandafter\bxtb@detok@ppst@a
  \csname\bxtb@nonce@pfx"#1#2\bxtb@detok@enda
  {} \bxtb@detok@endb\endcsname}
\def\bxtb@detok@enda{\bxtb@detok@enda@}
\def\bxtb@detok@endb{\bxtb@detok@endb@}
\begingroup
  \catcode`\(=12 \lccode`\(=`\{ \catcode`\)=12 \lccode`\)=`\}
  \lowercase{\gdef\bxtb@detok@brc@a#1#2{(#1#2)}}
\endgroup
\def\bxtb@detok@lop@a#1 #2\bxtb@detok@endb{%
  \bxtb@ifstrempty{#1}%
  { \bxtb@detok@lop@a}{\bxtb@detok@lop@b#1 }%
  #2\bxtb@detok@endb}
\def\bxtb@detok@lop@b#1#{%
  \bxtb@ifstrempty{#1}%
  {\bxtb@detok@brc@a\bxtb@detok@lop@a}{\bxtb@detok@lop@c#1}}
\def\bxtb@detok@lop@c#1{%
  \bxIfx{#1\bxtb@detok@enda}{\bxtb@detok@pst@a}{%
    \bxIfcat{\noexpand#1\relax}{\bxtb@format@cs#1}{\string#1}%
    \bxtb@detok@lop@a}}
\def\bxtb@edetok@lop@a#1 #2\bxtb@detok@endb{%
  \bxtb@ifstrempty{#1}%
  { \bxtb@edetok@lop@a}{\bxtb@edetok@lop@b#1 }%
  #2\bxtb@detok@endb}
\def\bxtb@edetok@lop@b#1#{%
  \bxtb@ifstrempty{#1}%
  {\bxtb@detok@brc@a\bxtb@edetok@lop@a}{\bxtb@edetok@lop@c#1}}
\def\bxtb@edetok@lop@c#1{%
  \bxIfx{#1\bxtb@detok@enda}{\bxtb@detok@pst@a}%
    {\bxtb@edetok@lop@d#1}}
\def\bxtb@edetok@lop@d#1{%
  \bxtb@ifdefmacro#1{\expandafter\bxtb@edetok@lop@a#1}%
    {\expandafter\bxtb@edetok@lop@e\romannumeral-`\a#1}}
\def\bxtb@edetok@lop@e#1{%
  \bxIfcat{\noexpand#1\relax}{\bxtb@format@cs#1}{\string#1}%
    \bxtb@edetok@lop@a}
\def\bxtb@detok@pst@a#1\bxtb@detok@endb{}
\def\bxtb@detok@ppst@a#1{%
  \expandafter\bxtb@detok@ppst@b\string#1\@nil}
\def\bxtb@detok@ppst@b#1#2"#3\@nil{\space#3}

%% \bxtb@format@cs\CS
% Detokenizes control sequence \CS with an optional space
% appended just in \write.
\def\bxtb@format@cs{%
  \expandafter\bxtb@format@cs@a\string\$%
  \bxtb@format@cs@c\bxtb@format@cs@b\@nil}
\def\bxtb@format@cs@a#1#2#3#4\@nil#5{%
  \expandafter#3\string#5\@nil}
\def\bxtb@format@cs@b{\bxtb@format@cs@c\@empty}
\def\bxtb@format@cs@c#1#2#3\@nil{%
  #1#2#3\ifcat_#3_\ifnum\catcode`#2=11 \space \fi\else\space\fi}

%% \bxtb@return@true
\def\bxtb@return@true#1\bxtb@esac{%
  \fi\@firstoftwo}
\def\bxtb@return@false#1\bxtb@esac{%
  \fi\@secondoftwo}


%--------------------------------------- 2. Dummy if-token definitions.

%% \bxtb@make@dummy@if@setter
\bxPreamble\def\bxtb@make@dummy@if@setter#1#2{%
  \begingroup
    \def\bxtb@bval{#1}%
    \@for\bxtb@bname:=#2\do{\bxtb@make@dummy@if@setter@a}%
  \endgroup}
\bxPreamble\def\bxtb@make@dummy@if@setter@a{%
  \expandafter\ifx\csname if\bxtb@bname\endcsname\relax
    \bxtb@make@dummy@if@setter@appto\bxtb@set@dummy@ifs{%
      \let \expandafter\noexpand\csname if\bxtb@bname\endcsname
      \expandafter\noexpand\csname if\bxtb@bval\endcsname}%
    \bxtb@make@dummy@if@setter@appto\bxtb@unset@dummy@ifs{%
      \let \expandafter\noexpand\csname if\bxtb@bname\endcsname
      \noexpand\@undefined}%
  \fi}
\bxPreamble\def\bxtb@make@dummy@if@setter@appto#1#2{%
  \edef\bxtb@tmpx{#2}%
  \expandafter\g@addto@macro\expandafter#1%
   \expandafter{\bxtb@tmpx}}
\let\bxtb@set@dummy@ifs\@empty
\let\bxtb@unset@dummy@ifs\@empty
\bxtb@make@dummy@if@setter{false}{%
  % e-TeX if-tokens
  fontchar,defined,csname,incsname,%
  % pdfTeX if-tokens
  pdfprimitive,pdfabsdim,pdfabsnum,%
  % LuaTeX if-tokens
  absdim,absnum,primitive,%
  % pTeX if-tokens
  tdir}
\bxtb@make@dummy@if@setter{true}{%
  % pTeX if-tokens
  ydir}

%%<+> \bxSetDummyIfs
%%<+> \bxUnsetDummyIfs
\newcommand*\bxSetDummyIfs{}
\let\bxSetDummyIfs\bxtb@set@dummy@ifs
\newcommand*\bxUnsetDummyIfs{}
\let\bxUnsetDummyIfs\bxtb@unset@dummy@ifs

%% dummy-ifs are enabled in this file
\bxSetDummyIfs

\bxPreamble\def\bxtb@defifmacro@engdep#1{%
  \expandafter\bxtb@defifmacro@engdep@a
   \csname bxIf#1\expandafter\endcsname
   \csname if#1\expandafter\endcsname
   \csname iftrue\expandafter\endcsname\csname iffalse\endcsname}
\bxPreamble\def\bxtb@defifmacro@engdep@a#1#2#3#4{%
  % be careful that #2,#3,#4 are \if-tokens
  \bxtb@defifmacro@noarg#1#2\relax \chardef\bxtb@tmpa\z@
  \ifx#2#3\chardef\bxtb@tmpa\@ne \fi
  \ifx#2#4\chardef\bxtb@tmpa\tw@ \fi
  \ifcase\bxtb@tmpa\relax
  \or \let#1\@firstoftwo
  \or \let#1\@secondoftwo
  \fi}
\bxPreamble\def\bxtb@make@engdep@test#1{%
  \@for\bxtb@bname:=#1\do{%
    \bxtb@defifmacro@engdep\bxtb@bname}}
% this must be done in \bxSetDummyIfs effective
\bxtb@make@engdep@test{%
  ydir,tdir%
}

%--------------------------------------- 3. Macrodef prefix operations

%% \bxtb@all@prefix
\def\bxtb@all@prefix{\do{protected}\do{long}\do{outer}}

%% \bxtb@set@prefix{<name>}
%% \bxtb@unset@prefix{<name>}
%% \bxtb@unset@all@prefix{<name>}
\def\bxtb@set@prefix#1{\bxtb@cslet{bxtb@PFX/#1}{T}}
\def\bxtb@unset@prefix#1{\bxtb@cslet{bxtb@PFX/#1}{F}}
\def\do{\noexpand\bxtb@unset@prefix}
\edef\bxtb@unset@all@prefix{\bxtb@all@prefix}

%% \bxtb@clear@prefix
\def\bxtb@clear@prefix{%
  \def\bxtb@savepfx@dummy{}\let\bxtb@savepfx@dummy\relax}

%% \bxtb@render@prefix
\def\do{\noexpand\bxtb@render@prefix@a}
\edef\bxtb@render@prefix{\bxtb@all@prefix}
\def\bxtb@render@prefix@a#1{%
  \bxIf{\csname bxtb@PFX/#1\endcsname T}{\csname #1\endcsname}{}}

%% \bxtb@save@prefix
\def\bxtb@save@prefix{%
  \def\bxtb@savepfx@dummy{}% prefixes applied to this definition
  \bxtb@unset@all@prefix
  \begingroup \escapechar`\\
  \expandafter\bxtb@savepfx@prs@a\meaning\bxtb@savepfx@dummy\@nil
  %\endgroup already done
}

%% some internal stuffs
\begingroup \escapechar\m@ne
\xdef\bxtb@g@args{{\string\macro:}{\space}{\string\\}}
\endgroup
\def\bxtb@do#1#2#3{%
  \def\bxtb@savepfx@prs@a##1#1##2\@nil{%
    \endgroup
    \let\bxtb@savepfx@dummy\relax
    \bxIfcat{_##1_}{}{\bxtb@savepfx@prs@b##1\@nil}}
  \def\bxtb@savepfx@prs@b##1##2#2##3\@nil{%
    \bxtb@savepfx@prs@c##2#3#3}
  \def\bxtb@savepfx@prs@c##1#3{%
    \bxIfcat{_##1_}{}%
    {\bxtb@set@prefix{##1}\bxtb@savepfx@prs@c}}
  \def\bxtb@ifdefmacro##1{%
    \expandafter\bxtb@ifdefmacro@a\meaning##1#1\@nil}
  \def\bxtb@ifdefmacro@a##1#1##2\@nil##3##4{%
    \bxIfcat{_##2_}{##4}{##3}}
}
\expandafter\bxtb@do\bxtb@g@args

%--------------------------------------- 4. pdfTeX primitives

%%<+> \ifbxPrimitive
% The primitive equivalent to pdfTeX's \ifpdfprimitive; if the
% primitive is not available, this is \let'd to \iffalse.
%%<+> \bxIfHasIfPrimitive{<T>}{<F>}
% Whether \ifbxPrimitive has a valid definition.
\bxtb@cslet{ifbxPrimitive}\@undefined
\expandafter\bxtb@ifprimitive\csname ifpdfprimitive\endcsname{%then
  \let\bxIfHasIfPrimitive\@firstoftwo
  \bxtb@csletcs{ifbxPrimitive}{ifpdfprimitive}%
}{%else
  \expandafter\bxtb@ifprimitive\csname ifprimitive\endcsname{%then
    \let\bxIfHasIfPrimitive\@firstoftwo
    \bxtb@csletcs{ifbxPrimitive}{ifprimitive}%
  }{%else
    \let\bxIfHasIfPrimitive\@secondoftwo
    \bxtb@csletcs{ifbxPrimitive}{iffalse}%
}}

%%<+> \bxPrimitive
% The primitive equivalent to pdfTeX's \pdfprimitive; if the
% primitive is not available, this is defined to be empty.
\bxtb@ifprimitive\pdfprimitive{%then
  \let\bxPrimitive\pdfprimitive
}{%else
  \bxtb@ifprimitive\primitive{%then
    \let\bxPrimitive\primitive
  }{%else
    \let\bxPrimitive\@empty
}}

%%<+> \bxStrcmp
% The primitive equivalent to pdfTeX's \pdfstrcmp; if the
% primitive is not available, this is left undefined.
\let\bxStrcmp\@undefined
\bxtb@ifprimitive\pdfstrcmp{%then
  \let\bxStrcmp\pdfstrcmp
}{%else
  \bxtb@ifprimitive\strcmp{%then
    \let\bxStrcmp\strcmp
  }{%else
}}
\ifbxinLuaTeX       %----<*LuaTeX>
  \ifdefined\luatexluaescapestring
    \unless\ifdefined\bxStrcmp
      \directlua0{%
        function bxtoolbox_strcmp(A, B)
          if A == B then    tex.write("0")
          elseif A < B then tex.write("-1")
          else              tex.write("1")
          end
        end
      }
      \long\def\bxStrcmp#1#2{\directlua0{%
        bxtoolbox_strcmp("\luatexluaescapestring{#1}",
          "\luatexluaescapestring{#2}")
      }}
    \fi
  \fi
\fi                 %----</LuaTeX>

%--------------------------------------- 5. non etoolbox stuffs

%%<+> \bxRobustdef\CS
%%<+> \bxRobustgdef\CS
%%<+> \bxRobustedef\CS
%%<+> \bxRobustxdef\CS
\ifbxineTeX         %<*etex>
\def\bxRobustdef{\protected\def}
\def\bxRobustgdef{\protected\gdef}
\def\bxRobustedef{\protected\edef}
\def\bxRobustxdef{\protected\xdef}
\else               %<*!etex>
\def\bxRobustdef{\bxtb@robustdef\def}
\def\bxRobustgdef{\bxtb@robustdef\gdef}
\def\bxRobustedef{\bxtb@robustdef\edef}
\def\bxRobustxdef{\bxtb@robustdef\xdef}
\def\bxtb@robustdef#1#2{%
  \bxtb@save@prefix
  \let#2\@undefined \DeclareRobustCommand*#2{}%
  \bxtb@let@name\bxtb@tmpb#2%
  \bxtb@render@prefix
  \expandafter#1\csname \bxtb@tmpb\space \endcsname}
\fi                 %</etex>

%% \bxtb@robustlet\CSA\CSB
\ifbxineTeX         %<*etex>
\def\bxtb@robustlet#1#2{%
  \protected\def#1{#2}}
\else               %<*!etex>
\def\bxtb@robustlet#1{%
  \expandafter\bxtb@robustlet@a
   \csname\bxtb@name@cs#1\space\endcsname#1}
\def\bxtb@robustlet@a#1#2#3{%
  \DeclareRobustCommand*#2{}\let#1#3}
\fi

%%<+> \bxIfPdfOutput{<T>}{<F>}
%%<+> \bxIfPdfOutputNow{<T>}{<F>}
\newcommand*\bxIfPdfOutputNow{%
  \ifx\pdfoutput\@undefined \bxtb@return@false \fi
  \ifx\pdfoutput\relax \bxtb@return@false \fi
  \ifnum\pdfoutput>\z@ \bxtb@return@true
  \else \bxtb@return@false \fi
  \bxtb@esac}
\newcommand*\bxIfPdfOutput{}
\bxIfPdfOutputNow
{\let\bxIfPdfOutput\@firstoftwo
 \bxtb@letcs\ifbxPdfOutput{iftrue}}%
{\let\bxIfPdfOutput\@secondoftwo
 \bxtb@letcs\ifbxPdfOutput{iffalse}}%

%%<+> \bxIfPrimitive\CS
%%<+> \bxCSIfPrimitive{<csname>}
\newcommand*\bxIfPrimitive{}
\bxtb@robustlet\bxIfPrimitive\bxtb@ifprimitive
\def\bxtb@ifcsprimitive@a#1{%
  \expandafter\bxIfPrimitive\csname #1\endcsname}
\ifbxineTeX          %<*etex>
\def\bxIfCsPrimitive#1{%
  \unless\ifcsname#1\endcsname \let\bxtb@tmpx\@secondoftwo
  \else \def\bxtb@tmpx{\bxtb@ifcsprimitive@a{#1}}%
  \fi \bxtb@tmpx}
\else               %<*!etex>
\def\bxIfCsPrimitive#1{%
  \begingroup\expandafter\endgroup
  \expandafter\ifx\csname #1\endcsname\@undefined
    \let\bxtb@tmpx\@secondoftwo
  \else \def\bxtb@tmpx{\bxtb@ifcsprimitive@a{#1}}%
  \fi \bxtb@tmpx}
\fi                 %</etex>
% use \ifbxPrimitive if available
\bxIfHasIfPrimitive{%
\bxtb@defifmacro\bxIfPrimitive\ifbxPrimitive\fi
}{}

%%<+> \bxIfPrimitiveX\CS
%% TODO: for e-TeX, TeX
% use \ifpdfprimitive if available
\bxIfHasIfPrimitive\@tempswatrue\@tempswafalse
\if@tempswa         %----
\let\bxIfPrimitiveX\bxIfPrimitive
\else               %----
\def\bxIfPrimitiveX#1{%
  \bxIfcat{\noexpand#1\relax}%
    {\bxtb@ifdefmacro#1{\@secondoftwo}{\bxtb@ifprimitive@x@a#1}}%
    {\@secondoftwo}}
\def\bxtb@ifprimitive@x@a#1{%
  \expandafter\bxtb@ifprimitive@x@b\meaning#1\bxtb@cmp@endb#1}
\def\bxtb@ifprimitive@x@b#1\bxtb@cmp@endb#2{%
  \expandafter\bxtb@ifprimitive@x@c\string#1\@bxtb@cmp@enda
    #2\bxtb@cmp@endb}
\def\bxtb@do#1{%
  \def\bxtb@ifprimitive@x@b##1\bxtb@cmp@endb##2{%
    \expandafter\bxtb@ifprimitive@x@c\string##1\@bxtb@cmp@enda
      ##2\bxtb@cmp@endb#1\@nil}}
\def\bxtb@ifprimitive@x@c#1 #2\@nil{%
  \bxtb@ifstrempty{#2}{\bxtb@ifeq@pstr#1}%
    {\@secondoftwo}}
\fi                 %----

%%<+> \bxIfExpToEqual{<text1>}{<text2>}{<T>}{<F>}
\newcommand*\bxIfExpToEqual{}
\bxRobustdef\bxIfExpToEqual#1#2{%
  \bxCheckForMovingArgForTest{%
    \bxtb@edef@detokenized\bxtb@tmpx{#1}%
    \bxtb@edef@detokenized\bxtb@tmpy{#2}%
    \bxIfx{\bxtb@tmpx\bxtb@tmpy}}}
% use \bxStrcmp if available
\ifx\bxStrcmp\@undefined\else
\def\bxIfExpToEqual#1#2{%
  \bxIfnum{\bxStrcmp{#1}{#2}=\z@}}
\fi

%%<+> \bxIfExpToEqualX{<text1>}{<text2>}{<T>}{<F>}
\def\bxIfExpToEqualX#1#2{%
  \bxtb@ifeq@text#1\bxtb@cmp@enda#2\bxtb@cmp@endb}
% use \bxStrcmp if available
\ifx\bxStrcmp\@undefined\else
\let\bxIfExpToEqualX\bxIfExpToEqual
\fi

%% \bxtb@ifstrequal@pdftex{<str1>}{<str2>}{<T>}{<F>}
% a version of \ifstrequal using \bxStrcmp
\ifx\bxStrcmp\@undefined\else
\def\bxtb@ifstrequal@pdftex#1#2{%
  \bxIfnum{\bxStrcmp{\detokenize{#1}}{\detokenize{#2}}=\z@}}
\AtEndOfPackage{% override the definition in etoolbox
  \let\bxIfstrequal\bxtb@ifstrequal@pdftex}
\fi

%% \bxIfstrequalX{<str1>}{<str2>}{<T>}{<F>}
\newcommand*\bxIfstrequalX{}
\def\bxIfstrequalX#1#2{%
  \bxtb@ifeq@str#1\bxtb@cmp@enda#2\bxtb@cmp@endb}
% use \bxStrcmp if available
\ifx\bxStrcmp\@undefined\else
\let\bxIfstrequalX\bxtb@ifstrequal@pdftex
\fi

%% \bxtb@nonce@pfx
\def\bxtb@nonce@pfx{bxtb@?@\string\$}

%%<+> \bxDetokenize{<text>}
\bxIfineTeX
{\let\bxDetokenize\detokenize}
{\let\bxDetokenize\bxtb@detokenize}
%%<+> \bxStringify{<text>}
\let\bxStringify\bxtb@stringify

%% \bxtb@def@detokenized\CS{<text>}
%% \bxtb@edef@detokenized\CS{<text>}
\ifbxineTeX         %<*etex>
\def\bxtb@def@detokenized#1#2{%
  \edef#1{\detokenize{#2}}}
\def\bxtb@edef@detokenized#1#2{%
  \edef\bxtb@args{\noexpand#1{#2}}%
  \expandafter\bxtb@def@detokenized\bxtb@args}
\else               %<*!etex>
\def\bxtb@def@detokenized{\bxtb@defdetok@a\def}
\def\bxtb@edef@detokenized{\bxtb@defdetok@a\edef}
\def\bxtb@defdetok@a#1#2#3{%
  #1\bxtb@tmpa{#3}%
  \expandafter\bxtb@defdetok@b\meaning\bxtb@tmpa\@nil#2}
\def\bxtb@defdetok@b#1>#2\@nil#3{\def#3{#2}}
\fi                 %</etex>

%% \bxtb@ifeq@text
\def\bxtb@ifeq@text#1\bxtb@cmp@enda#2\bxtb@cmp@endb{%
  \expandafter\expandafter\expandafter\bxtb@ifeqtx@a
    \bxtb@stringify@ss{#2}\bxtb@cmp@endb#1\bxtb@cmp@enda}
\def\bxtb@ifeqtx@a#1\bxtb@cmp@endb#2\bxtb@cmp@enda{%
  \expandafter\expandafter\expandafter\bxtb@ifeq@pstr
    \bxtb@stringify@ss{#2}\bxtb@cmp@enda#1\bxtb@cmp@endb}

%% \bxtb@ifeq@str#1#2
\def\bxtb@ifeq@str#1\bxtb@cmp@enda#2\bxtb@cmp@endb{%
  \expandafter\expandafter\expandafter\bxtb@ifeqstr@a
    \bxtb@detokenize@ss{#2}\bxtb@cmp@endb#1\bxtb@cmp@enda}
\def\bxtb@ifeqstr@a#1\bxtb@cmp@endb#2\bxtb@cmp@enda{%
  \expandafter\expandafter\expandafter\bxtb@ifeq@pstr
    \bxtb@detokenize@ss{#2}\bxtb@cmp@enda#1\bxtb@cmp@endb}

%% \bxtb@ifeq@pstr
\def\bxtb@ifeq@pstr#1\bxtb@cmp@enda#2\bxtb@cmp@endb{%
  \bxtb@ifstrempty{#1}%
    {\bxtb@ifstrempty{#2}}%
    {\bxtb@ifstrempty{#2}{\@secondoftwo}%
      {\bxtb@ifeqps@a#1\bxtb@cmp@enda#2\bxtb@cmp@endb}}}
\def\bxtb@ifeqps@a#1#2\bxtb@cmp@enda#3#4\bxtb@cmp@endb{%
  \bxIfx{#1#3}%
    {\bxtb@ifeq@pstr#2\bxtb@cmp@enda#4\bxtb@cmp@endb}%
    {\@secondoftwo}}
\def\bxtb@cmp@enda{\bxtb@cmp@enda@}
\def\bxtb@cmp@endb{\bxtb@cmp@endb@}

%% \bxtb@space@subst
\def\bxtb@space@subst#1 #2\bxtb@ss@endb{%
  \bxtb@ifstrempty{#2}{\bxtb@spcsub@a#1\bxtb@ss@endb}%
    {\bxtb@space@subst#1\space#2\bxtb@ss@endb}}
\def\bxtb@spcsub@a#1\bxtb@ss@enda#2\bxtb@ss@endb{\space#1}
\def\bxtb@ss@enda{\bxtb@ss@enda@}
\def\bxtb@ss@endb{\bxtb@ss@endb@}

%% \bxtb@combine@ss
\def\bxtb@combine@ss#1#2{%
  \expandafter\expandafter\expandafter\bxtb@space@subst
    #1{#2}\bxtb@ss@enda{} \bxtb@ss@endb}
\def\bxtb@detokenize@ss{%
  \romannumeral-`\a\bxtb@combine@ss\bxDetokenize}
\def\bxtb@stringify@ss{%
  \romannumeral-`\a\bxtb@combine@ss\bxStringify}

%%<+> \bxCsNoexpand{<csname>}
\newcommand*\bxCsNoexpand[1]{%
  \expandafter\noexpand\csname#1\endcsname}

%--------------------------------------- 6. Import from etoolbox

%% \bxtb@import{\CSA \CSB ...}
% [e-TeX] Aliases each of macros to a new name with 'bx' prefixed.
% [non-e-TeX] Adds the prefixed name to the function check list.
\bxPreamble\def\bxtb@import#1{%
  \bxtb@listmake@do
  \@tfor\bxtb@tmpa:=#1\do{\expandafter\bxtb@importcmd\bxtb@tmpa}}
\bxPreamble\def\bxtb@importcmd#1{%
  \begingroup
    \expandafter\bxtb@importcmd@a\string#1\@nil
  \endgroup}
\bxPreamble\def\bxtb@importcmd@a#1#2#3\@nil{%
  \@tempcnta`#2 \@tempcntb\@tempcnta
  \ifnum 96<\@tempcntb \ifnum 123>\@tempcntb
    \advance\@tempcntb-32 \fi\fi
  \uccode\@tempcnta\@tempcntb
  \uppercase{\edef\bxtb@tmpa{#2}}%
  \expandafter\bxtb@importcmd@b\csname bx\bxtb@tmpa#3%
    \expandafter\endcsname\csname #2#3\endcsname}

%% \bxtb@provide{\CSA \CSB ...}
% [e-TeX] Does nothing.
% [non-e-TeX] Adds the name to the function check list.
\bxPreamble\def\bxtb@provide#1{%
  \bxtb@listmake@do
  \@tfor\bxtb@tmpa:=#1\do{\expandafter\bxtb@providecmd\bxtb@tmpa}}

\ifbxineTeX         %<*etex>
%% Load etoolbox.
\RequirePackage{etoolbox}\relax
%%
\bxPreamble\def\bxtb@importcmd@b#1#2{\global\let#1#2}
\bxPreamble\def\bxtb@providecmd#1{}

\else               %<*!etex>
%%
\bxPreamble\let\bxtb@provided\@empty
\bxPreamble\def\bxtb@importcmd@b#1#2{%
  \xdef\bxtb@provided{\bxtb@provided\do#1}}
\bxPreamble\def\bxtb@providecmd#1{%
  \xdef\bxtb@provided{\bxtb@provided\do#1}}

\fi                 %</etex>

\bxtb@import{%
%%==== Here is a list of commands imported to bx* namespace.
%% For such commands, bxtoolbox provides compatible but not equivalent
%% commands when e-TeX extension is not available, under the same
%% 'bx'-prefixed name.
  \newrobustcmd \renewrobustcmd \providerobustcmd         %2.1
  \robustify                                              %2.2
  \csuse \csshow                                          %3.1.1
  \ifcsdef \ifcsundef                                     %3.6.1
}
\bxtb@provide{%
%% For the following commands, bxtoolbox provides equivalent commands
%% for non-e-TeX environment under the same name as in etoolbox.
  \AfterPreamble \AtEndPreamble \AfterEndPreamble         %2.5
  \AfterEndDocument
  \csdef \csgdef \csedef \csxdef                          %3.1.1
  \cslet \letcs \csletcs \undef \csundef
  \appto \gappto \eappto \xappto                          %3.3.1
  \csappto \csgappto \cseappto \csxappto
  \preto \gpreto \epreto \xpreto                          %3.3.2
  \cspreto \csgpreto \csepreto \csxpreto
  \newbool \providebool \booltrue \boolfalse              %3.5.1
  \setbool \ifbool \notbool
  \newtoggle \providetoggle \toggletrue \togglefalse      %3.5.2
  \settoggle \iftoggle \nottoggle
  \ifdef \ifundef                                         %3.6.1
  \ifstrequal \ifstrempty                                 %3.6.2
}

\ifbxineTeX         %<*etex>
%% When the engine is eTeX, stop reading here.
\bxUnsetDummyIfs
\expandafter\endinput
\fi                 %</etex>
%--------------------------------------- 7. etoolbox compatible functions

%% error messages
\def\bxtb@err@ukbool#1{\bxtb@error
  {\bxtb@@bs if#1 undefined}\@eha}
\def\bxtb@err@ukbval#1{\bxtb@error
  {Invalid boolean value '#1'}\@eha}
\def\bxtb@err@aetgl#1{\bxtb@error
  {Toggle '#1' already defined}\@eha}
\def\bxtb@err@uktgl#1{\bxtb@error
  {Toggle '#1' undefined}\@eha}
\def\bxtb@err@nomcr#1{\bxtb@error
  {\string#1 is not a macro}\@eha}

%%<+> \cslet
%%<+> \letcs
%%<+> \csletcs
\bxtb@robustlet\cslet\bxtb@cslet
\bxtb@robustlet\letcs\bxtb@letcs
\bxtb@robustlet\csletcs\bxtb@csletcs

%%<+> \bxNewrobustcmd
%%<+> \bxRenewrobustcmd
%%<+> \bxProviderobustcmd
\newcommand\bxNewrobustcmd{}
\DeclareRobustCommand*\bxNewrobustcmd{%
  \bxtb@dclrobustcmd@a\bxtb@ifnewdefok}
\def\bxtb@dclrobustcmd@a#1{%
  \@ifstar{\bxtb@dclrobustcmd@b#1{*}}{\bxtb@dclrobustcmd@b#1{}}}
\def\bxtb@dclrobustcmd@b#1#2#3{%
  #1#3{\DeclareRobustCommand#2#3}{\bxtb@skip@new@cmd}}
\bxNewrobustcmd*\bxRenewrobustcmd{%
  \bxtb@dclrobustcmd@a\bxtb@ifrenewdefok}
\bxNewrobustcmd*\bxProviderobustcmd{%
  \bxtb@dclrobustcmd@a\bxtb@ifprovidedefok}

%%<+> \bxRobustify
\bxNewrobustcmd*\bxRobustify[1]{%
  \ifundef{#1}{\bxtb@err@nomcr#1}
   {\bxtb@ifdefmacro{#1}%
     {\begingroup
      \expandafter\bxtb@robustify@a
       \csname\bxtb@name@cs#1\space\endcsname#1}%
     {\bxtb@err@nomcr#1}}}
\def\bxtb@robustify@a#1#2{%
  \global\let\bxtb@rbf@do\@empty
  \let\bxtb@tmpa#2\let#2\@undefined
  \let\bxtb@tmpb#1\let#1\@undefined
  \DeclareRobustCommand*#2{}%
  \ifx#2\bxtb@tmpa
    \bxtb@warn{\string#2 is already robust}%
  \else\ifx\bxtb@tmpb\relax
    \global\let\bxtb@rbf@tmpa#2%
    \gdef\bxtb@rbf@do{\let#1#2\let#2\bxtb@rbf@tmpa}%
  \else \bxtb@error{Failed to robustify \string#1}\@ehc
  \fi\fi
  \endgroup \bxtb@rbf@do}

%%<+> \csdef
%%<+> \csedef
%%<+> \csgdef
%%<+> \csxdef
\bxNewrobustcmd*\csdef[1]{\expandafter\def\csname #1\endcsname}
\bxNewrobustcmd*\csedef[1]{\expandafter\edef\csname #1\endcsname}
\bxNewrobustcmd*\csgdef[1]{\expandafter\gdef\csname #1\endcsname}
\bxNewrobustcmd*\csxdef[1]{\expandafter\xdef\csname #1\endcsname}

%%<+> \undef
%%<+> \csundef
\bxNewrobustcmd*\undef[1]{\let#1\@undefined}
\bxNewrobustcmd*\csundef[1]{%
 \expandafter\let\csname #1\endcsname\@undefined}

%%<+> \ifdef\CS{<T>}{<F>}
%%<+> \ifundef\CS{<T>}{<F>}
%%<+> \bxIfcsdef{<csname>}{<T>}{<F>}
%%<+> \bxIfcsundef{<csname>}{<T>}{<F>}
\newcommand*\ifdef[1]{%
  \ifx#1\@undefined \expandafter\@secondoftwo
  \else \expandafter\@firstoftwo
  \fi}
\newcommand*\ifundef[1]{%
  \ifx#1\@undefined \expandafter\@firstoftwo
  \else \expandafter\bxtb@ifundef@a\expandafter#1%
  \fi}
\def\bxtb@ifundef@a#1{%
  \ifx#1\relax \expandafter\@firstoftwo
  \else \expandafter\@secondoftwo
  \fi}
\newcommand*\bxIfcsdef[1]{%
  \bxCheckForMovingArgForTest{%
    \begingroup\expandafter\endgroup
    \expandafter\ifx\csname #1\endcsname\@undefined
      \expandafter\@secondoftwo
    \else \expandafter\@firstoftwo
    \fi}}
\newcommand*\bxIfcsundef[1]{%
  \bxCheckForMovingArgForTest{%
    \begingroup\expandafter\expandafter\expandafter\endgroup
    \expandafter\ifx\csname #1\endcsname\relax
      \expandafter\@firstoftwo
    \else \expandafter\@secondoftwo
    \fi}}

%%<+> \bxCsuse
\bxNewrobustcmd*\bxCsuse[1]{%
  \bxIfcsdef{#1}{\csname #1\endcsname}{}}

%%<+> \bxCsshow
\bxNewrobustcmd*\bxCsshow[1]{%
  \bxIfcsdef{#1}{\expandafter\show\csname #1\endcsname}{}}

%%<+> \appto
%%<+> \gappto
%%<+> \eappto
%%<+> \xappto
\bxNewrobustcmd*\appto{\bxtb@appto\@empty}
\bxNewrobustcmd*\gappto{\bxtb@appto\global}
\bxNewrobustcmd*\eappto{\bxtb@eappto\@empty}
\bxNewrobustcmd*\xappto{\bxtb@eappto\global}
\bxNewrobustcmd*\csappto[1]{\expandafter\appto\csname#1\endcsname}
\bxNewrobustcmd*\csgappto[1]{\expandafter\gappto\csname#1\endcsname}
\bxNewrobustcmd*\cseappto[1]{\expandafter\eappto\csname#1\endcsname}
\bxNewrobustcmd*\csxappto[1]{\expandafter\xappto\csname#1\endcsname}
\def\bxtb@eappto#1#2#3{%
  \edef\bxtb@args{\noexpand#1\noexpand#2{#3}}%
  \expandafter\bxtb@appto\bxtb@args}
\def\bxtb@appto#1#2#3{%
  \begingroup
    \ifx#2\@undefined \let#2\@empty \fi
    \toks@\expandafter{#2#3}\xdef\bxtb@g@tmpa{\the\toks@}%
  \endgroup #1\let#2\bxtb@g@tmpa}

%%<+> \preto
%%<+> \gpreto
%%<+> \epreto
%%<+> \xpreto
\bxNewrobustcmd*\preto{\bxtb@preto\@empty}
\bxNewrobustcmd*\gpreto{\bxtb@preto\global}
\bxNewrobustcmd*\epreto{\bxtb@epreto\@empty}
\bxNewrobustcmd*\xpreto{\bxtb@epreto\global}
\bxNewrobustcmd*\cspreto[1]{\expandafter\preto\csname#1\endcsname}
\bxNewrobustcmd*\csgpreto[1]{\expandafter\gpreto\csname#1\endcsname}
\bxNewrobustcmd*\csepreto[1]{\expandafter\epreto\csname#1\endcsname}
\bxNewrobustcmd*\csxpreto[1]{\expandafter\xpreto\csname#1\endcsname}
\toksdef\bxtb@toksa=2
\def\bxtb@epreto#1#2#3{%
  \edef\bxtb@args{\noexpand#1\noexpand#2{#3}}%
  \expandafter\bxtb@preto\bxtb@args}
\def\bxtb@preto#1#2#3{%
  \begingroup
    \ifx#2\@undefined \let#2\@empty \fi
    \toks@\expandafter{#2}\bxtb@toksa{#3}%
    \xdef\bxtb@g@tmpa{\the\bxtb@toksa\the\toks@}%
  \endgroup #1\let#2\bxtb@g@tmpa}

%%<+> \newbool
%%<+> \providebool
\bxNewrobustcmd*\newbool[1]{%
  \expandafter\bxtb@newbool@a\csname if#1\endcsname}
\def\bxtb@newbool@a#1{\@ifdefinable#1{\newif#1}}
\bxNewrobustcmd*\providebool[1]{%
  \@ifundefined{if#1}%
  {\expandafter\newif\csname if#1\endcsname}{}}

%%<+> \booltrue
%%<+> \boolfalse
%%<+> \setbool
% NB: Here \bxIfcsundef cannot be used because otherwise the use
% with \global would fail.
\bxNewrobustcmd*\booltrue[1]{%
  \bxIfcsundefX{if#1}{\bxtb@clear@prefix\bxtb@err@ukbool{#1}}%
   {\csname #1true\endcsname}}
\bxNewrobustcmd*\boolfalse[1]{%
  \bxIfcsundefX{if#1}{\bxtb@clear@prefix\bxtb@err@ukbool{#1}}%
   {\csname #1false\endcsname}}
\bxNewrobustcmd*\setbool[2]{%
  \bxIfcsundefX{if#1}{\bxtb@clear@prefix\bxtb@err@ukbool{#1}}%
   {\bxIfcsundefX{#1#2}{\bxtb@clear@prefix\bxtb@err@ukbval{#2}}%
    {\csname #1#2\endcsname}}}

%%<+> \ifbool
%%<+> \notbool
\@gobble{\if\if}% if-match hack
\newcommand*\ifbool[1]{%
  \bxIfcsundefX{if#1}{\bxtb@err@ukbool{#1}\@gobbletwo}%
   {\csname if#1\endcsname\expandafter\@firstoftwo
    \else \expandafter\@secondoftwo
    \fi}}
\newcommand*\notbool[1]{%
  \bxIfcsundefX{if#1}{\bxtb@err@ukbool{#1}\@gobbletwo}%
   {\csname if#1\endcsname\expandafter\@secondoftwo
    \else \expandafter\@firstoftwo
    \fi}}

%%<+> \newtoggle
%%<+> \providetoggle
\bxNewrobustcmd*\newtoggle[1]{%
  \bxIfcsdef{bxtb@TG/#1}{\bxtb@err@aetgl{#1}}%
    {\cslet{bxtb@TG/#1}\bxtb@tgl@@false}}
\bxNewrobustcmd*\providetoggle[1]{%
  \bxIfcsdef{bxtb@TG/#1}{}{\cslet{bxtb@TG/#1}\bxtb@tgl@@false}}
\let\bxtb@tgl@@true\@firstoftwo
\let\bxtb@tgl@@false\@secondoftwo

%%<+> \toggletrue
%%<+> \togglefalse
%%<+> \settoggle
% NB: Here \bxIfcsdef cannot be used because otherwise the use
% with \global would fail.
\bxNewrobustcmd*\toggletrue[1]{%
  \bxIfcsundefX{bxtb@TG/#1}{\bxtb@clear@prefix\bxtb@err@uktgl{#1}}%
    {\cslet{bxtb@TG/#1}\bxtb@tgl@@true}}
\bxNewrobustcmd*\togglefalse[1]{%
  \bxIfcsundefX{bxtb@TG/#1}{\bxtb@clear@prefix\bxtb@err@uktgl{#1}}%
    {\cslet{bxtb@TG/#1}\bxtb@tgl@@false}}
\bxNewrobustcmd*\settoggle[2]{%
  \bxIfcsundefX{bxtb@TG/#1}{\bxtb@clear@prefix\bxtb@err@uktgl{#1}}%
   {\bxIfcsundefX{bxtb@tgl@@#2}{\bxtb@clear@prefix\bxtb@err@ukbval{#2}}%
     {\csletcs{bxtb@TG/#1}{bxtb@tgl@@#2}}}}

%%<+> \iftoggle
%%<+> \nottoggle
\newcommand*\iftoggle[1]{%
  \bxIfcsundefX{bxtb@TG/#1}{\bxtb@err@uktgl{#1}\@gobbletwo}%
   {\csname bxtb@TG/#1\endcsname}}
\newcommand*\nottoggle[1]{%
  \bxIfcsundefX{bxtb@TG/#1}{\bxtb@err@uktgl{#1}\@gobbletwo}%
   {\csname bxtb@TG/#1\endcsname\@secondoftwo\@firstoftwo}}

%%<+> \ifstrequal{<str1>}{<str2>}{<T>}{<F>}
\newcommand*\ifstrequal{}
\bxRobustdef\ifstrequal#1#2{%
  \bxCheckForMovingArgForTest{%
    \bxtb@def@detokenized\bxtb@tmpx{#1}%
    \bxtb@def@detokenized\bxtb@tmpy{#2}%
    \bxIfx{\bxtb@tmpx\bxtb@tmpy}}}

%%<+> \ifstrempty{<str>}{<T>}{<F>}
\newcommand*\ifstrempty{}
\let\ifstrempty\bxtb@ifstrempty

%% internal stuffs needed for hook commands
\bxPreamble\def\bxtb@prepare@bdhook#1#2{%
  \bxNewrobustcmd*#1{\gappto#2}%
  \newcommand*#2{}}
\def\bxtb@dispatch@bdhook#1#2{%
  \let#1\@firstofone #2%
  \bxRobustdef#1{\@notprerr\@gobble}\undef#2}

%%<+> \AtEndPreamble
%%<+> \AfterPreamble
%%<+> \AfterEndPreamble
%%<+> \AfterEndDocument
\bxtb@prepare@bdhook\AtEndPreamble\@endpreamblehook
\bxtb@prepare@bdhook\AfterEndPreamble\@afterendpreamblehook
\bxtb@prepare@bdhook\AfterEndDocument\@afterenddocumenthook
\bxNewrobustcmd*\AfterPreamble{\AtBeginDocument}
\AtEndPreamble{\let\AfterPreamble\@firstofone}
\AfterEndPreamble{\undef\bxtb@dispatch@bdhook}
%
\preto\document{\endgroup
  \bxtb@dispatch@bdhook\AtEndPreamble\@endpreamblehook
  \begingroup}
\appto\document{%
  \bxtb@dispatch@bdhook\AfterEndPreamble\@afterendpreamblehook
  \ignorespaces}
% patch to \enddocument
\bxPreamble\def\bxtb@patch@enddocument{%
  \expandafter\bxtb@patch@ed@a\enddocument\deadcycles\bxtb@end}
\bxPreamble\def\bxtb@patch@ed@a#1\deadcycles#2\bxtb@end{%
  \bxtb@ifstrempty{#2}{\bxtb@patch@ed@fail}%
   {\def\bxtb@tmpa{#1}\bxtb@patch@ed@b#2\bxtb@end}}
\bxPreamble\def\bxtb@patch@ed@b#1\deadcycles#2\bxtb@end{%
  \bxtb@ifstrempty{#2}{\bxtb@patch@ed@c{#1}}%
   {\bxtb@patch@ed@fail}}
\bxPreamble\def\bxtb@patch@ed@c#1{%
  \appto\bxtb@tmpa{\let\AfterEndDocument\@firstofone
    \@afterenddocumenthook
    \deadcycles#1}%
  \let\bxtb@org@enddocument\enddocument
  \let\enddocument\bxtb@tmpa}
\bxPreamble\def\bxtb@patch@ed@fail{%
  \bxtb@warn{\string\AfterEndDocument\space is set disabled}%
  \bxRobustdef\AfterEndDocument##1{\bxtb@error
    {\string\AfterEndDocument\space is now disabled}\@eha}}
\bxtb@patch@enddocument

%--------------------------------------- 8. Epilogue
\def\do#1{%
  \ifx#1\@undefined \bxtb@warn{\string#1 not yet implemented}\fi}
\bxtb@provided
\bxUnsetDummyIfs
\endinput
%% EOF