% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 20.2.2, p. III-121.
% Original source in file "tokens3.TEX", starting line 263.
\wlog{L: "list-mac.tip" ["tokens3.TEX," l. 263, p. III-121]}%
% This file DOES belong to format "texip."
\InputD{compst.tip}
\catcode`\@ = 11
\def\@EmptyRefList{}
\def\EmptyListConditional #1{%
TT\fi
\ifx#1\@EmptyRefList
}
\newtoks\@AppendTokOne
\newtoks\@AppendTokTwo
\def\LeftAppendElement #1#2{%
\edef\@AppendTemp{\noexpand\\{#2}}%
\@AppendTokOne = \expandafter{\@AppendTemp}%
\@AppendTokTwo = \expandafter{#1}%
\edef#1{\the\@AppendTokOne \the\@AppendTokTwo}%
}
\def\RightAppendElement #1#2{%
\edef\@AppendTemp{\noexpand\\{#2}}%
\@AppendTokOne = \expandafter{\@AppendTemp}%
\@AppendTokTwo = \expandafter{#1}%
\edef#1{\the\@AppendTokTwo \the\@AppendTokOne}%
}
\def\CarOfList #1#2{%
\def\@CarTemp \\##1##2\@EndCarList{\def#2{##1}}%
\expandafter\@CarTemp#1\@EndCarList
}
\def\CdrOfList #1#2{%
\def\@CdrTemp \\##1##2\@EndCdrList{\def#2{##2}}%
\expandafter\@CdrTemp#1\@EndCdrList
}
\def\DropFirstElementOfList #1{%
\if\EmptyListConditional{#1}%
\errhelp = {\string\DropFirstElementOfList: list is
empty. No first element to drop.}%
\errmessage{\string\DropFirstElementOfList: List
\noexpand#1 is empty.}%
\else
\def\@DropFirstElementTemp \\##1##2\@EndCdrList{\def#1{##2}}%
\expandafter\@DropFirstElementTemp#1\@EndCdrList
\fi
}
\def\CarCarOfList #1#2{%
\let\@CarCarOfListList = #1%
\DropFirstElementOfList{\@CarCarOfListList}%
\CarOfList{\@CarCarOfListList}{#2}
}
\def\ForEveryListElement #1#2{%
\let\@ForEveryList = #1%
\let\@ForEveryListElementMacro = #2%
\@ForEveryListElement
}
\def\@ForEveryListElement{%
\if\EmptyListConditional{\@ForEveryList}%
\let\@ForEveryListElementNext = \relax
\else
\CarOfList{\@ForEveryList}{\@ForEveryListElementElement}%
\@ForEveryListElementMacro{\@ForEveryListElementElement}%
\DropFirstElementOfList{\@ForEveryList}%
\let\@ForEveryListElementNext = \@ForEveryListElement
\fi
\@ForEveryListElementNext
}
\newif\if@MemberList
\def\MemberOfListConditional #1#2{%
TT\fi
\@MemberListfalse
{%
\def\\##1{%
\if\StringsEqualConditional{#2}{##1}%
\global\@MemberListtrue
\fi
}%
#1%
}%
\if@MemberList
}
\def\ReverseList #1#2{%
\def\@ReverseListOut{}%
\ForEveryListElement{#1}{\@ReverseList}%
\let#2 = \@ReverseListOut
}
\def\@ReverseList #1{%
\LeftAppendElement{\@ReverseListOut}{#1}%
}
\def\LastElementOfList #1#2{%
\ReverseList{#1}{#1}%
\CarOfList{#1}{#2}%
\ReverseList{#1}{#1}%
}
\def\DropLastElementOfList #1{%
\ReverseList{#1}{#1}%
\DropFirstElementOfList{#1}%
\ReverseList{#1}{#1}%
}
\def\NumberOfListElements #1#2{%
\let\@NumberOfListElementsList = #1%
\def\@NumberOfListElementsCount{#2}%
\@NumberOfListElementsCount = 0
\@NumberOfListElements
}
\def\@NumberOfListElements{%
\if\EmptyListConditional{\@NumberOfListElementsList}%
\let\@NumberOfListElementsNext = \relax
\else
\advance\@NumberOfListElementsCount by 1
\DropFirstElementOfList{\@NumberOfListElementsList}%
\let\@NumberOfListElementsNext = \@NumberOfListElements
\fi
\@NumberOfListElementsNext
}
\newcount\@NumberOfListElCCount
\def\NumberOfListElementsNumConditional #1{%
0=0\fi
\NumberOfListElements{#1}{\@NumberOfListElCCount}%
\ifnum\@NumberOfListElCCount
}
\def\CombineTwoLists #1#2#3{%
\def\@CombineTwoLists{\def\@CombineTwoListsResult}%
\expandafter\expandafter\expandafter
\expandafter\expandafter\expandafter
\expandafter\@CombineTwoLists
\expandafter\expandafter\expandafter{\expandafter#1#2}%
\let #3 = \@CombineTwoListsResult
}
\catcode`\@ = 12
