Master/texmf-dist/tex/latex/williams/toklist.sty


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% Impliment token list macros from pages 378-379 of "The TeXbook" by D.E. Knuth
% ISBN 0-201-13448-9

\newtoks\TOKL@ta
\newtoks\TOKL@tb
\long\def\TOKL@prepend#1\to#2{\TOKL@ta={\\{#1}}\TOKL@tb=\expandafter{#2}%
  \edef#2{\the\TOKL@ta\the\TOKL@tb}}
\long\def\TOKL@prependv#1\to#2{\TOKL@ta={\\}\TOKL@tb=\expandafter{#2}%
  \edef#2{\the\TOKL@ta{#1}\the\TOKL@tb}}
\long\def\TOKL@append#1\to#2{\TOKL@ta={\\{#1}}\TOKL@tb=\expandafter{#2}%
  \edef#2{\the\TOKL@tb\the\TOKL@ta}}
\long\def\TOKL@appendv#1\to#2{\TOKL@ta={\\}\TOKL@tb=\expandafter{#2}%
  \edef#2{\the\TOKL@tb\the\TOKL@ta{#1}}}
\def\TOK@concat#1=#2&#3{\TOK@ta=\expandafter{#2}\TOK@tb=\expandafter{#3}%
  \edef#1{\the\TOKL@ta\the\TOKL@tb}}

\def\TOKL@lop#1\to#2{\expandafter\TOKL@lopoff#1\TOKL@lopoff#1#2}
\long\def\TOKL@lopoff\\#1#2\TOKL@lopoff#3#4{\def#4{#1}\def#3{#2}}

\def\TOK@card#1\to#2{#2=0 \long\def\\##1{\advance#2 by 1 }#1}

\def\TOK@select#1\of#2\to#3{\def#3{\outofrange}%
  \long\def\\##1{\advance#1-1 \ifnum#1=0 \def#3{##1}\fi}#2}

\def\TOK@empty#1{\ifx#1\empty true\else false\fi}