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%D \module
%D [ file=core-fnt,
%D version=1995.10.10,
%D title=\CONTEXT\ Core Macros,
%D subtitle=Fonts,
%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.
\writestatus{loading}{ConTeXt Core Macros / Fonts}
\unprotect
%D \macros
%D {compound}
%D
%D We will overload the already active \type {|} so we have
%D to save its meaning in order to be able to use this handy
%D macro.
%D
%D \starttyping
%D so test\compound{}test can be used instead of test||test
%D \stoptyping
\bgroup \catcode\barasciicode\activecatcode \gdef\compound#1{|#1|} \egroup
%D Here we hook some code into the clean up mechanism needed
%D for verbatim data.
\appendtoks
\disablecompoundcharacters
\disablediscretionaries
\to \everycleanupfeatures
%D The following code will me mkiv'd when needed. It's rather easy to
%D extend the kerner with glue.
%D \macros
%D {stretched}
%D
%D Stretching characters in a word is a sort of typographical
%D murder. Nevertheless we support this manipulation for use in
%D for instance titles.
%D
%D \starttyping
%D \hbox to 5cm{\stretched{murder}}
%D \stoptyping
%D
%D \typebuffer
%D
%D or
%D
%D \startexample
%D \getbuffer
%D \stopexample
%D
%D \showsetup{stretched}
\unexpanded\def\stretched#1%
{\ifvmode\hbox to \hsize\else\ifinner\else\hbox\fi\fi
\bgroup\processtokens\relax\hss\relax{\hss\hss}{#1}\egroup}
%D \startbuffer
%D \stretched{Unknown Box}
%D \hbox to .5\hsize{\stretched{A Horizontal Box}}
%D \vbox to 2cm{\stretched{A Vertical Box}}
%D \hbox to 3cm{\stretched{sp{\'e}c{\`\i}{\"a}l}}
%D \stopbuffer
%D
%D \getbuffer
%D
%D The first line of this macros takes care of boxing. Normally
%D one will use an \type{\hbox} specification. The last line
%D shows how special characters should be passed.
%D
%D \typebuffer
%D \macros
%D {stretchednormalcase, stretcheduppercase, stretchedlowercase}
%D
%D A convenient alternative is:
%D
%D \starttyping
%D \stretcheduppercase{Is this what you like?}
%D \stoptyping
%D
%D \typebuffer
%D
%D this one uses fixed skips and kerns.
%D
%D \startexample
%D \getbuffer
%D \stopexample
%D
%D The default skip can be set with:
%D Given the following settings, the space is 1em by default:
%D OBSOLETE:
\def\stretchedspacefactor{4}
\def\stretchedspaceamount{.25em}
\def\stretchedbreaktokens{.@/}
\unexpanded\def\stretchednormalcase
{\stretchedsomecase\firstofoneargument}
\unexpanded\def\stretcheduppercase
{\stretchedsomecase{\the\everyuppercase\uppercase}}
\unexpanded\def\stretchedlowercase
{\stretchedsomecase{\the\everylowercase\lowercase}}
\def\stretchedsomecase#1#2%
{\bgroup
#1{\def\textstring{#2}}%
\ifdim\stretchedspaceamount=\zeropoint
\textstring
\else
\def\textkern##1%
{% beware: ##1 may not be \box\somebox -)
\determinemidwordbreak{##1}{\stretchedbreaktokens}%
\kern\stretchedspaceamount##1\domidwordbreak}%
\def\textskip
{\scratchdimen\stretchedspaceamount
\hskip\stretchedspacefactor\scratchdimen}%
\@EA\processtokens\@EA\relax\@EA\textkern\@EA\relax\@EA\textskip\@EA{\textstring}%
\fi
\egroup}
%D An auxiliary macro, see for usage \type {\stretcheduppercase}.
\let\domidwordbreak\relax
\def\setmidwordbreaktoken#1%
{\sfcode`#1=5000\relax}
\def\determinemidwordbreak#1#2%
{\edef\midwordbreaktokens{#2}%
\ifx\midwordbreaktokens\empty
\global\let\domidwordbreak\relax
\else
\setbox\scratchbox\hbox
{\expandafter\handletokens\midwordbreaktokens\with\setmidwordbreaktoken
a\space \!!dimena\lastskip
#1\space\!!dimenb\lastskip \relax % needed
\ifdim\!!dimena=\!!dimenb
\globallet\domidwordbreak\relax
\else
\globallet\domidwordbreak\allowbreak
\fi}%
\fi}
\protect \endinput
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