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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 12.1.3, p. II-108.
+% Original source in file "par3.TEX", starting line 176.
+\wlog{L: "x-parsh.tip" ["par3.TEX," l. 176, p. II-108]}%
+% This file DOES belong to format "texip."
+\InputD{doloop.tip}
+\catcode`\@ = 11
+\newcount\X@ParShapeCountA
+\newcount\X@ParShapeCountB
+\newcount\X@ParShapeCountC
+\newdimen\X@ParShapeDimenA
+\newdimen\X@ParShapeDimenB
+\def\XParShape{%
+ \def\X@ParShapeCollect{ }%
+ \X@ParShapeCountC = 0
+ \afterassignment\X@ParShapeB
+ \X@ParShapeCountA
+}
+\def\X@ParShapeB{%
+ \ifnum\X@ParShapeCountA = 0
+ \let\@XParShapeNext = \X@ParShapeD
+ \else
+ \advance\X@ParShapeCountA by -1
+ \let\@XParShapeNext = \X@ParShapeC
+ \fi
+ \@XParShapeNext
+}
+\def\X@ParShapeD{%
+ \parshape = \X@ParShapeCountC\X@ParShapeCollect
+}
+\def\X@ParShapeC #1 #2 #3 #4 #5 {%
+ \message{\string\X@ParShapeC: #1, #2, #3, #4, #5}%
+ \X@ParShapeDimenA = #2%
+ \X@ParShapeDimenB = #4%
+ \DoLoop{\X@ParShapeCountB}{1}{1}{#1}%
+ {%
+ \edef\X@ParShapeCollect{%
+ \space
+ \X@ParShapeCollect
+ \the\X@ParShapeDimenA
+ \space
+ \the\X@ParShapeDimenB
+ \space
+ }%
+ \advance\X@ParShapeCountC by 1
+ \advance\X@ParShapeDimenA by #3\relax
+ \advance\X@ParShapeDimenB by #5\relax
+ }%
+ \X@ParShapeB
+}
+\catcode`\@ = 12