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-%D \module
-%D [ file=supp-spe,
-%D version=1997.07.05,
-%D title=\CONTEXT\ Support Macros,
-%D subtitle=Specials,
-%D author=Hans Hagen,
-%D date=\currentdate,
-%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
-%C
-%C This module is part of the \CONTEXT\ macro||package and is
-%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
-%C details.
-
-%D This module implements some \type{\special} manipulation
-%D macros. I needed these when I implemented the code that
-%D handles the conversion of \TPIC\ specials to \PDF\ code.
-
-\ifx \undefined \writestatus \input supp-mis.tex \relax \fi
-\ifx \undefined \redefinespecial \else \expandafter \endinput \fi
-
-\writestatus{loading}{ConTeXt Support Macros / Specials}
-
-\unprotect
-
-%D When interpreting specials we need to do some basic scanning.
-%D For the moment we distinguish between three cases. We need
-%D
-%D \starttyping
-%D \special{tag: arguments}
-%D \special{tag arguments}
-%D \special{tag}
-%D \stoptyping
-%D
-%D We cannot be sure that the first case isn't
-%D
-%D \starttyping
-%D \special{tag:arguments}
-%D \stoptyping
-%D
-%D So we have to take care of that one too.
-
-%D \macros
-%D {redefinespecial}
-%D
-%D Specials that are to be interpreted are defined with
-%D commands like:
-%D
-%D \startbuffer[tmp-1]
-%D \redefinespecial a: \using#1\endspecial%
-%D {let's execute special 'a:' using '#1'}
-%D
-%D \redefinespecial a \using#1\endspecial%
-%D {let's execute special 'a' using '#1'}
-%D
-%D \redefinespecial a \using#1\endspecial%
-%D {let's execute special 'a' using nothing}
-%D \stopbuffer
-%D
-%D \typebuffer[tmp-1]
-%D
-%D The first two always take an argument, the last one not.
-%D The definition of this redefinition macro is not that
-%D complex. The names are internally tagged with \type{\@rds@}
-%D which saves both time and space.
-
-\def\@rds@{@rds@}
-
-\def\redefinespecial #1 {\setvalue{\@rds@#1}}
-
-%D \macros
-%D {mimmickspecials}
-%D
-%D Mimmicking specials is activated by saying:
-%D
-%D \starttyping
-%D \mimmickspecials
-%D \stoptyping
-%D
-%D This commands redefines the \PLAIN\ \TEX\ primitive
-%D \type{\special}.
-
-\def\mimmickspecials
- {\let\special\domimmickspecial}
-
-%D The special mimmicking macro first looks if it can find an
-%D colon terminated tag, next it searches for a tag that end
-%D with a space. If both cannot find, the tag itself is treated
-%D without argument.
-
-\def\domimmickspecial#1%
- {\domimmickcolonspecial#1:\relax/:\relax/\end}
-
-\def\domimmickcolonspecial#1:#2#3:\relax/#4\end
- {\ifx#2\relax
- \domimmickspacespecial#1 \relax/ \relax/\end
- \else
- \dodomimmickspecial#1:\using#2#3\endspecial
- \fi}
-
-\def\domimmickspacespecial#1 #2#3 \relax/#4\end
- {\ifx#2\relax
- \dodomimmickspecial#1\using\endspecial
- \else
- \dodomimmickspecial#1\using#2#3\endspecial
- \fi}
-
-\def\dodomimmickspecial#1\using#2\endspecial
- {\expandafter\ifx\csname\@rds@#1\endcsname\relax % \doifdefinedelse
- \defaultspecial{#1 #2}%
- \else
- %\message{[mimmick special #1 with #2]}%
- \getvalue{\@rds@#1}\using#2\endspecial
- \fi}
-
-%D Now let's show that things work the way we want, using the
-%D previous definitions of tag~a.
-%D
-%D \startbuffer[tmp-2]
-%D \mimmickspecials
-%D \special{a: 1 2 3 4 5}
-%D \special{a: 1 2 3 4 5}
-%D \special{a}
-%D \stopbuffer
-%D
-%D \typebuffer[tmp-2]
-%D
-%D Which results in:
-%D
-%D \startlines
-%D \getbuffer[tmp-1]
-%D \getbuffer[tmp-2]
-%D \stoplines
-
-%D \macros
-%D {mimmickspecial}
-%D
-%D When needed, one can call a mimmicked special directly by
-%D saying for instance:
-%D
-%D \starttyping
-%D \mimmickspecial a: \using...\endspecial
-%D \stoptyping
-%D
-%D This can be handy when specials have much in common.
-
-\def\mimmickspecial #1 {\getvalue{\@rds@#1}}
-
-%D \macros
-%D {normalspecial,defaultspecial}
-%D
-%D Unknown specials are passed to the default special handler.
-%D One can for instance ignore all further specials by saying
-%D \type{\normalspecial}:
-%D
-%D \starttyping
-%D \def\defaultspecial#1{}
-%D \stoptyping
-%D
-%D But here we default to idle.
-
-\let\normalspecial \special
-\let\defaultspecial\special
-
-\protect \endinput