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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 25.1.19.1, p. III-341.
+% Original source in file "macros5.TEX", starting line 1398.
+\wlog{L: "stswitch.tip" ["macros5.TEX," l. 1398, p. III-341]}%
+% This file DOES belong to format "texip."
+\InputD{compst.tip}
+\catcode`\@ = 11
+\newcount\@StringSwitchMatchCount
+\def\StringSwitch #1#2{%
+ \edef\@StringSwitchMasterString{#1}%
+ \if\EmptyStringConditional{#1}%
+ \errmessage{\string\StringSwitch: master string
+ must not be the empty string.}%
+ \fi
+ \def\@StringSwitchMatchCommonCode{#2}%
+ \@StringSwitchMatchCount = 0
+ \@StringSwitch
+}
+\def\@StringSwitchOne #1#2{%
+ \def\@StringSwitchString{#1}%
+ \def\@StringSwitchAction{#2}%
+}
+\def\@StringSwitch #1{%
+ \@StringSwitchOne #1%
+ \if\EmptyStringConditional{\@StringSwitchString}%
+ \ifcase\@StringSwitchMatchCount
+ \@StringSwitchAction
+ \or
+ \else
+ \errmessage{\string\StringSwitch: double match.}%
+ \fi
+ \def\@StringSwitchNext{}%
+ \else
+ \if\StringsEqualConditional{\@StringSwitchMasterString}%
+ {\@StringSwitchString}%
+ \advance\@StringSwitchMatchCount by 1
+ \@StringSwitchMatchCommonCode
+ \@StringSwitchAction
+ \fi
+ \def\@StringSwitchNext{\@StringSwitch}%
+ \fi
+ \@StringSwitchNext
+}
+\catcode`\@ = 12