% 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{\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}