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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 9.3.9.1, p. I-335.
% Original source in file "boxit.TEX", starting line 1131.
\wlog{L: "boxing7.tip" ["boxit.TEX," l. 1131, p. I-335]}%
% This file DOES belong to format "texip."
\InputD{boxing6.tip}
\InputD{vcentx.tip}
\catcode`\@ = 11
\newdimen\@BoxRDimen
\newbox\@BoxRBox
\newcount\@BoxRNumber
\def\HboxR{%
\hbox\bgroup
\def\@WhichBox{\hbox}%
\def\@WhichBoxDimen{}%
\@BoxRaa
}
\def\VboxR{%
\vbox\bgroup
\def\@WhichBox{\vbox}%
\def\@WhichBoxDimen{}%
\@BoxRaa
}
\def\VtopR{%
\vtop\bgroup
\def\@WhichBox{\vtop}%
\def\@WhichBoxDimen{}%
\@BoxRaa
}
\def\VcenterXR{%
\hbox\bgroup
\def\@WhichBox{\VcenterX}%
\def\@WhichBoxDimen{}%
\@BoxRaa
}
\def\BoxR{%
\hbox\bgroup
\def\@WhichBox{\hbox}%
\def\@WhichBoxDimen{}%
\afterassignment\@BoxRB
\@BoxRNumber =
}
\def\@BoxRB{%
\HboxR{\box\@BoxRNumber}%
\egroup
}
\def\CopyR{%
\hbox\bgroup
\def\@WhichBox{\hbox}%
\def\@WhichBoxDimen{}%
\afterassignment\@CopyRbb
\@BoxRNumber =
}
\def\@CopyRbb{%
\HboxR{\copy\@BoxRNumber}%
\egroup
}
\def\@BoxRaa{%
\futurelet\@BoxRSymbol\@BoxRA
}
\def\@BoxRA{%
\ifx\@BoxRSymbol\bgroup
\let\@BoxitNext = \@BoxRb
\else
\if\@BoxRSymbol t%
\let\@BoxitNext = \@BoxRbTo
\else
\let\@BoxitNext = \@BoxRbSpread
\fi
\fi
\@BoxitNext
}
\def\@BoxRb{%
\afterassignment\@BoxRbTwo
\let\@BoxDrop =
}
\def\@BoxRbTwo{%
\setbox\@BoxRBox = \expandafter\@WhichBox\@WhichBoxDimen\bgroup
\aftergroup\@BoxRbThree
}
\def\@BoxRbThree{%
\BoxingE{\box\@BoxRBox}%
\egroup
}
\def\@BoxRbTo to{%
\def\@WhichBoxDimen{to}%
\afterassignment\@BoxRbMoreSpreadTo
\@BoxRDimen =
}
\def\@BoxRbSpread spread{%
\def\@WhichBoxDimen{spread}%
\afterassignment\@BoxRbMoreSpreadTo
\@BoxRDimen =
}
\def\@BoxRbMoreSpreadTo{%
\edef\@WhichBoxDimen{\@WhichBoxDimen \the\@BoxRDimen}%
\afterassignment\@BoxRbTwo
\let\@BoxDrop =
}
\catcode`\@ = 12
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