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%D \module
%D [ file=char-act,
%D version=2006.12.05,
%D title=\CONTEXT\ Character Support,
%D subtitle=Active,
%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 Character Support / Active}
\unprotect
\ifdefined\page_otr_fill_and_eject_page \else \let\page_otr_fill_and_eject_page\relax \fi % forward reference
%D \macros
%D {obeyedspace, obeyedtab, obeyedline, obeyedpage}
%D
%D We have followed Knuth in naming macros that make \SPACE,
%D \NEWLINE\ and \NEWPAGE\ active and assigning them
%D \type{\obeysomething}, but first we set some default values.
% These are expandable!
\def\obeyedspace {\space}
\def\obeyedtab {\obeyedspace}
\def\obeyedline {\par}
\def\obeyedpage {\page_otr_fill_and_eject_page}
%D \macros
%D {controlspace,setcontrolspaces}
%D
%D First we define \type{\obeyspaces}. When we want visible
%D spaces (control spaces) we only have to adapt the definition
%D of \type{\obeyedspace} to:
\chardef\asciispacechar\spaceasciicode % a real space character
\unexpanded\def\naturalspace{\asciispacechar}
\unexpanded\def\controlspace{\hbox{\asciispacechar}} % rather tex, we need the unicode value
\unexpanded\def\normalspaces{\catcode\spaceasciicode\spacecatcode}
\bgroup
\catcode\spaceasciicode\activecatcode
\unexpanded\gdef\obeyspaces{\catcode\spaceasciicode\activecatcode\def {\obeyedspace}}
\unexpanded\gdef\setcontrolspaces{\catcode\spaceasciicode\activecatcode\def {\controlspace}}
\egroup
%D \macros
%D {obeytabs, obeylines, obeypages,ignoretabs, ignorelines, ignorepages}
%D
%D Next we take care of \NEWLINE\ and \NEWPAGE\ and because we
%D want to be able to typeset listings that contain \TAB, we
%D have to handle those too. Because we have to redefine the
%D \NEWPAGE\ character locally, we redefine the meaning of
%D this (often already) active character.
\expandafter\def\activeformfeedtoken{\par}
%D The following indirect definitions enable us to implement
%D all kind of \type{\obeyed} handlers.
\unexpanded\def\obeytabs {\catcode\tabasciicode \activecatcode\expandafter\def\activetabtoken {\obeyedtab }}
\unexpanded\def\obeylines {\catcode\endoflineasciicode\activecatcode\expandafter\def\activeendoflinetoken{\obeyedline}}
\unexpanded\def\obeypages {\catcode\formfeedasciicode \activecatcode\expandafter\def\activeformfeedtoken {\obeyedpage}}
\unexpanded\def\ignoretabs {\catcode\tabasciicode \activecatcode\expandafter\def\activetabtoken {\obeyedspace}}
\unexpanded\def\ignorelines{\catcode\endoflineasciicode\activecatcode\expandafter\def\activeendoflinetoken{\obeyedspace}}
\unexpanded\def\ignorepages{\catcode\formfeedasciicode \ignorecatcode}
\unexpanded\def\ignoreeofs {\catcode\endoffileasciicode\ignorecatcode}
%D \macros
%D {naturaltextext}
%D
%D When one uses \ETEX, switching to normal \TEX\ is possible
%D too. We also introduce a switch that can be used in the
%D drivers and set in higher level shell macros.
\unexpanded\def\naturaltextext#1\relax % this command will become obsolete
{\begingroup
\def\ascii{#1}%
\setcatcodetable\ctxcatcodes
\prettynaturalfont{\scantextokens\expandafter{\ascii}\ifhmode\unskip\fi}%
\endgroup}
\endinput \protect
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