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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]
%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
%D \macros
%D {processingverbatim}
%D
%D Typesetting a file in most cases results in more than one
%D page. Because we don't want problems with files that are
%D read in during the construction of the page, we set \type
%D {\ifprocessingverbatim}, so the output routine can adapt
%D its behavior. Originally we used \type {\scratchread}, but
%D because we want to support nesting, we decided to use a
%D separate input file.
\newif\ifprocessingverbatim
%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.
\def\obeyedspace {\ifprocessingverbatim\hbox{ }\else\space\fi}
\def\obeyedtab {\obeyedspace}
\def\obeyedline {\par}
\def\obeyedpage {\vfill\eject}
%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:
\def\controlspace{\hbox{\char32}} % rather tex
\def\normalspace { }
\def\normalspaces{\catcode`\ =\@@space}
\bgroup
\catcode`\ =\@@active
\gdef\obeyspaces{\catcode`\ =\@@active\def {\obeyedspace}}
\gdef\setcontrolspaces{\catcode`\ =\@@active\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.
\catcode`\^^L=\@@active \def^^L{\par}
%D The following indirect definitions enable us to implement
%D all kind of \type{\obeyed} handlers.
\bgroup
\catcode`\^^I=\@@active
\catcode`\^^M=\@@active
\catcode`\^^L=\@@active
\gdef\obeytabs {\catcode`\^^I=\@@active\def^^I{\obeyedtab}}
\gdef\obeylines {\catcode`\^^M=\@@active\def^^M{\obeyedline}}
\gdef\obeypages {\catcode`\^^L=\@@active\def^^L{\obeyedpage}}
\gdef\ignoretabs {\catcode`\^^I=\@@active\def^^I{\obeyedspace}}
\gdef\ignorelines {\catcode`\^^M=\@@active\def^^M{\obeyedspace}}
\gdef\ignorepages {\catcode`\^^L=\@@ignore} % \@@active\def^^L{\obeyedline}}
\gdef\ignoreeofs {\catcode`\^^Z=\@@ignore}
\egroup
%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.
\def\naturaltextext#1\relax
{\bgroup
\def\ascii{#1}%
\setcatcodetable\ctxcatcodes
\prettynaturalfont{\scantextokens\expandafter{\ascii}\ifhmode\unskip\fi}%
\egroup}
\endinput \protect
% obsolete (old hack for idris)
%D This is a hack, and only meant for special situations. We don't
%D support this in for instance verbatim. The active characters map
%D onto the \CONTEXT\ names and font handling etc. is up to the user.
%D This feature is obsolete.
\registerctxluafile{char-act}{1.001}
\def\enableactiveutf {\ctxlua{characters.active.enable()}}
\def\disableactiveutf{\ctxlua{characters.active.disable()}}
\def\testactiveutf #1{\ctxlua{characters.active.test("#1")}}
%D Usage:
%D
%D \starttyping
%D \enableactiveutf \testactiveutf{eacute}
%D \stoptyping
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