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% from TeXbook, appendix D
\protected\def\yquant@futurenonspacelet#1{%
\def\yquant@futurenonspacelet@cs{#1}%
\afterassignment\yquant@futurenonspacelet@i\let\yquant@futurenonspacelet@next= %
}
\def\yquant@futurenonspacelet@i{%
\expandafter\futurelet\yquant@futurenonspacelet@cs\yquant@futurenonspacelet@ii%
}
\def\yquant@futurenonspacelet@ii{%
\expandafter\ifx\yquant@futurenonspacelet@cs\@sptoken%
\expandafter\yquant@futurenonspacelet@iii%
\else%
\expandafter\yquant@futurenonspacelet@next%
\fi%
}
\def\yquant@futurenonspacelet@iii{%
\afterassignment\yquant@futurenonspacelet@i%
\let\@eattoken= %
}
% Loop #1 from min(#2, #3) to max(#2, #3), executing #4
\protected\def\yquant@for #1:=#2to#3#{%
\yquant@for@aux#1{#2}{#3}%
}
\long\def\yquant@for@aux#1#2#3#4{%
\ifnum#2<#3\relax%
\numdef#1{#2}%
% to allow for things like \yquant@for \i := \i to ..., expand the boundaries
\expandafter\yquant@for@loop\expandafter#1\expandafter{\the\numexpr#3+1\relax}{#4}%
\else%
\numdef#1{#3}%
\expandafter\yquant@for@loop\expandafter#1\expandafter{\the\numexpr#2+1\relax}{#4}%
\fi%
}
\long\def\yquant@for@loop#1#2#3{%
\loop%
\ifnum#1<#2\relax%
#3%
\numdef#1{#1+1}%
\repeat%
}
% Def #1 to be the minimum of #2, ... until \relax
\protected\def\yquant@min#1{%
\def#1{2147483647}%
\def\yquant@min@var{#1}%
\yquant@min@loop%
}
\def\yquant@min@loop#1{%
\unless\ifx#1\relax\relax%
\ifnum#1<\yquant@min@var\relax%
\expandafter\edef\yquant@min@var{#1}%
\fi%
\expandafter\yquant@min@loop%
\fi%
}
% Def #1 to be the maximum of #2, ... until \relax
\protected\def\yquant@max#1{%
\def#1{-2147483647}%
\def\yquant@max@var{#1}%
\yquant@max@loop%
}
\def\yquant@max@loop#1{%
\unless\ifx#1\relax\relax%
\ifnum#1>\yquant@max@var\relax%
\expandafter\edef\yquant@max@var{#1}%
\fi%
\expandafter\yquant@max@loop%
\fi%
}
% Cleanup global tokens after environment
\protected\def\yquant@cleanup@csadd#1{%
\csxappto{\yquant@prefix cleanup}{\expandafter\noexpand\csname#1\endcsname}%
}
\def\yquant@cleanup#1#2{%
\global\undef#1%
\unless\ifx|#2%
\expandafter\yquant@cleanup\expandafter#2%
\fi%
}
% Executes #3 if #1 (single token!) is equal (\ifx) to the first token of #2, and #4 else.
\def\ifyquant@firsttoken#1#2{%
% First check whether #2 is present at all...
\if\relax\detokenize{#2}\relax%
\expandafter\@secondoftwo%
\else%
\ifyquant@firsttoken@aux#1#2\yquant@sep%
\fi%
}
\def\ifyquant@firsttoken@aux#1#2#3\yquant@sep{%
\ifx#1#2%
\expandafter\expandafter\expandafter\@firstoftwo%
\else%
\expandafter\expandafter\expandafter\@secondoftwo%
\fi%
}
% Executes #3 if #1 begins with #2, and #4 else - non-expandable
\protected\def\ifyquant@beginswith#1#2{%
\def\ifyquant@beginswith@##1#2##2\yquant@end{%
\if\relax\detokenize{##1}\relax%
\expandafter\@firstoftwo%
\else%
\expandafter\@secondoftwo%
\fi%
}%
\ifyquant@beginswith@#1#2\yquant@end%
}
% absolute value of a dimension
\def\yquant@abs#1{%
\ifdim#1<0pt %
\the\dimexpr-\dimexpr#1\relax\relax%
\else%
#1%
\fi%
}
% Sortlist related macros.
\newcount\yquant@sort@count
\protected\def\yquant@sort@clear{%
% Probably cleanup used macros?
\yquant@sort@count=0 %
}
\protected\def\yquant@sort@eadd#1{%
\csedef{yquant@sort@item\the\yquant@sort@count}{#1}%
\advance \yquant@sort@count by 1 %
}
% Perform quicksort on the stored sortlist.
% #1: compare macro that expands to ##3 if its second argument is strictly larger than its first or to ##4 else
\protected\def\yquant@sort#1{%
\let\yquant@sort@cmp=#1%
\expandafter\yquant@sort@aux\expandafter0\expandafter{\the\numexpr\yquant@sort@count-1\relax}%
}
\protected\def\yquant@sort@aux#1#2{%
\ifnum#1<#2\relax%
\yquant@sort@divide{#1}{#2}%
\edef\cmd{%
\noexpand\yquant@sort@aux{#1}{\the\numexpr\count0-1\relax}%
\noexpand\yquant@sort@aux{\the\numexpr\count0+1\relax}{#2}%
}%
\cmd%
\fi%
}
\protected\def\yquant@sort@divide#1#2{%
\count0=#1\relax% i
\count2=#2\relax% j
\advance\count2 by -1 %
\letcs\yquant@sort@pivot{yquant@sort@item#2}%
\loop%
% search an item from the left that is larger or equal to the pivot
{% protect the outer loop from finding \repeat
\csletcs{next}{iftrue}%
\loop%
\ifnum\count0<#2\relax%
\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\yquant@sort@cmp%
\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter{%
\expandafter\expandafter\expandafter\yquant@sort@pivot%
\expandafter\expandafter\expandafter}%
\expandafter\expandafter\expandafter{%
\csname yquant@sort@item\the\count0\endcsname%
}{%
\csletcs{next}{iffalse}%
}{%
\advance\count0 by 1 %
}%
\else%
\csletcs{next}{iffalse}%
\fi%
\next%
\repeat%
\expandafter%
}%
\expandafter\count\expandafter0\expandafter=\the\count0\relax%
% search an item from the right that is small than the pivot
{% protect the outer loop from finding \repeat
\csletcs{next}{iftrue}%
\loop%
\ifnum\count2>#1\relax%
\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\yquant@sort@cmp%
\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter{%
\expandafter\expandafter\expandafter\yquant@sort@pivot%
\expandafter\expandafter\expandafter}%
\expandafter\expandafter\expandafter{%
\csname yquant@sort@item\the\count2\endcsname%
}{%
\advance\count2 by -1 %
}{%
\csletcs{next}{iffalse}%
}%
\else%
\csletcs{next}{iffalse}%
\fi%
\next%
\repeat%
\expandafter
}%
\expandafter\count\expandafter2\expandafter=\the\count2\relax%
\ifnum\count0<\count2 %
% swap item i <> item j
\letcs\tmp{yquant@sort@item\the\count0}%
\csletcs{yquant@sort@item\the\count0}{yquant@sort@item\the\count2}%
\cslet{yquant@sort@item\the\count2}\tmp%
\fi%
\ifnum\count0<\count2 %
\repeat%
\letcs\tmp{yquant@sort@item\the\count0}%
\csletcs{yquant@sort@item\the\count0}{yquant@sort@item#2}%
\cslet{yquant@sort@item#2}\tmp%
}
% Sorts an internal etoolbox list #1 using macro #2
\protected\def\yquant@sort@list#1#2{%
\begingroup%
\yquant@sort@count=0 %
\def\do##1{%
\csdef{yquant@sort@item\the\yquant@sort@count}{##1}%
\advance\yquant@sort@count by 1 %
}%
\dolistloop#1%
\yquant@sort#2%
\let#1=\empty%
\count0=0 %
\loop%
\ifnum\count0<\yquant@sort@count%
\expandafter\expandafter\expandafter\listadd%
\expandafter\expandafter\expandafter#1%
\expandafter\expandafter\expandafter{%
\csname yquant@sort@item\the\count0\endcsname%
}%
\advance\count0 by 1 %
\repeat%
\expandafter%
\endgroup%
\expandafter\def\expandafter#1\expandafter{#1}%
}
\protected\def\yquant@sort@dolistloop{%
\count0=0 %
\loop%
\ifnum\count0<\yquant@sort@count%
\expandafter\expandafter\expandafter\do%
\expandafter\expandafter\expandafter{%
\csname yquant@sort@item\the\count0\endcsname%
}
\advance\count0 by 1 %
\repeat%
}
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