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%D \module
%D [ file=spac-chr,
%D version=2011.05.24, % code moved from core-spa.mkiv
%D title=\CONTEXT\ Spacing Macros,
%D subtitle=Characters,
%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 Spacing Macros / Characters}
\unprotect
\registerctxluafile{spac-chr}{1.001}
\definesystemattribute[characters][public]
%D The nobreakspace is special as it needs to keep track of the space being
%D flexible. Another option is to use space (glue) nodes and tag them as characters
%D instead. No big deal but takes a moment of coding. So, as a prelude we
%D tag the nobreakspace only. Interesting is that it also fits better in the
%D tagging mechanism.
%D
%D But we need to do some checking as from then on we no longer can compare
%D them in a string. So this needs thinking. Not that we can compare the
%D nobreakspace now anyway.
% \unexpanded\def\specialspacecharacter#1{\begingroup\attribute\charactersattribute#1\ \endgroup}
%
% \unexpanded\edef\nobreakspace {\specialspacecharacter{"00A0}} % 1 = left
% \unexpanded\edef\ideographicspace {\specialspacecharacter{"2000}}
% \unexpanded\edef\ideographichalffillspace{\specialspacecharacter{"2001}}
% \unexpanded\edef\twoperemspace {\specialspacecharacter{"2002}}
% \unexpanded\edef\threeperemspace {\specialspacecharacter{"2004}}
% \unexpanded\edef\fourperemspace {\specialspacecharacter{"2005}}
% \unexpanded\edef\sixperemspace {\specialspacecharacter{"2006}}
% \unexpanded\edef\figurespace {\specialspacecharacter{"2007}}
% \unexpanded\edef\punctuationspace {\specialspacecharacter{"2008}}
% \unexpanded\edef\breakablethinspace {\specialspacecharacter{"2009}}
% \unexpanded\edef\hairspace {\specialspacecharacter{"200A}}
% \unexpanded\edef\zerowidthspace {\specialspacecharacter{"200B}}
% \unexpanded\edef\zwnj {\specialspacecharacter{"200C}}
% \unexpanded\edef\zwj {\specialspacecharacter{"200D}}
% \unexpanded\edef\narrownobreakspace {\specialspacecharacter{"202F}}
% This does not work as spaceskip is only inserted in the case of raggedleft
% and we need to be able to figure out all of them. Which makes me wonder ...
% can't we just always set spaceskip to some value?
% Making them active is also not an option unless we do that in every
% catcode vector.
% \nobreakspace {\begingroup\setalignstateattribute\normalUchar"00A0\endgroup} % 1 = left
\edef\nobreakspace {\normalUchar"00A0} % space
\edef\ideographicspace {\normalUchar"2000} % quad/2
\edef\ideographichalffillspace{\normalUchar"2001} % quad
\edef\twoperemspace {\normalUchar"2002} % quad/2
% % "2003 % quad == \quad == \hskip\emwidth
\edef\threeperemspace {\normalUchar"2004} % quad/3
\edef\fourperemspace {\normalUchar"2005} % quad/4
\edef\sixperemspace {\normalUchar"2006} % quad/6
\edef\figurespace {\normalUchar"2007} % width of zero
\edef\punctuationspace {\normalUchar"2008} % width of period
\edef\breakablethinspace {\normalUchar"2009} % quad/8
\edef\hairspace {\normalUchar"200A} % quad/8
\edef\zerowidthspace {\normalUchar"200B} % 0
\edef\zerowidthnonjoiner {\normalUchar"200C} % 0
\edef\zerowidthjoiner {\normalUchar"200D} % 0
\edef\narrownobreakspace {\normalUchar"202F} % quad/8
% % "205F % space/8 (math)
% \zerowidthnobreakspace {\normalUchar"FEFF}
\udef\zerowidthnobreakspace {\penalty\plustenthousand\kern\zeropoint}
\let\zwnj\zerowidthnonjoiner
\let\zwj \zerowidthjoiner
\let\nbsp\nobreakspace
\chardef\optionalspace"1F % will be space unless before punctuation
% Shortcuts:
% unexpanded as otherwise we need to intercept / cleanup a lot
\unexpanded\def~{\nobreakspace}
% Goodies:
\unexpanded\def\fiveperemspace{\hskip\dimexpr\emwidth/5\relax}
\protect \endinput
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