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% 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 11.2.1, p. II-67.
% Original source in file "par2.TEX", starting line 956.
\wlog{L: "parv-1.tip" ["par2.TEX," l. 956, p. II-67]}%
% This file DOES belong to format "texip."
\catcode`\@ = 11
\newdimen \Delta@XY
\newskip\@ParListBeforeAfter
\newskip\@ParListBetweenLabels
\newskip\@ParListAfterLabel
\newcount\@LabeledParNesting    \@LabeledParNesting = 0
\newcount\@LabelCounter
\def\BeginAList #1#2#3#4#5#6#7{%
    \par
    \bgroup
    \advance\leftskip by #1
    \advance\rightskip by #2
    \advance \@LabeledParNesting by 1
    \@LabelCounter = 0
    \Delta@XY = #3
    \ifdim\Delta@XY < 0pt
        \errmessage{\string\BeginAList: negative Delta{xy},
            made positive.}%
    \fi
    \@ParListBeforeAfter = #4   
    \@ParListBetweenLabels = #5
    \@ParListAfterLabel = #6
    \SetParIndent{#7}
}
\def\EndAList{% 
    \par
    \vskip\@ParListBeforeAfter
    \egroup
}
\def\@GenLabel #1{%
    \par
    \advance\@LabelCounter by 1
    \ifnum\@LabelCounter = 1
        \parskip = \@ParListBeforeAfter
    \else
        \parskip = \@ParListBetweenLabels
    \fi
    \noindent
    \hbox to 0pt{#1}%
    \parskip = \@ParListAfterLabel
    \ignorespaces
}
\def\ItemLL #1{% 
    \@GenLabel{%
        \hskip -\Delta@XY
        #1%
        \hfil
    }%
}
\def\ItemLR #1{%
    \@GenLabel{%
        \hss
        #1%
        \hskip\Delta@XY
    }%
}
\def\ItemRL #1{%
    \@GenLabel{%
        \hskip\Delta@XY
        #1%
        \hss
    }%
}
\def\ItemRR #1{%
    \@GenLabel{%
        \hfil
        #1%
        \hskip -\Delta@XY
    }%
}
\catcode`\@ = 12