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%D \module
%D [ file=syst-tex,
%D version=1995.10.10,
%D title=\CONTEXT\ System Macros,
%D subtitle=Efficient \PLAIN\ \TEX\ loading,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. Non||commercial use is
%C granted.
%D We've build \CONTEXT\ on top of \PLAIN\ \TEX. Because we
%D want to make the format file as independant as possible of
%D machine dependant font encodings, we have to bypass the
%D loading of fonts.
%D
%D Let's start at the beginning. Because \PLAIN\ is not yet
%D loaded we have to define some \CATCODES\ ourselves.
\catcode`\{=1 % left brace is begin-group character
\catcode`\}=2 % right brace is end-group character
\catcode`\#=6 % hash mark is macro parameter character
%D We are going to report to the user what we are skipping.
\def\skipmessage#1{\immediate\write16{skipping #1 in plain}}
%D We want to be able to use the \type{\newsomething}
%D declarations not only on the \type{\outer} level. This can
%D be done by redefining \type{\outer} so we have to save its
%D original meaning.
\let\normalouter = \outer
\let\outer = \relax
%D We also want to postpone the loading of hyphenation patters,
%D so we redefine and therefore save \type{\input}.
\let\normalinput = \input
\def\input #1 {\skipmessage{\string\input}}
%D Finaly are going to we redefine some font specification
%D commands and that's why we save them too. The redefinitions
%D are straightforward because the macros have to do nothing
%D but skipping.
\let\normalskewchar = \skewchar
\def\skewchar #1=#2 {\skipmessage{\string\skewchar}}
\let\normaltextfont = \textfont
\let\normalscriptfont = \scriptfont
\let\normalscriptscriptfont = \scriptscriptfont
\def\textfont #1=#2{\skipmessage{\string\textfont}}
\def\scriptfont #1=#2{\skipmessage{\string\scriptfont}}
\def\scriptscriptfont #1=#2{\skipmessage{\string\scriptscriptfont}}
%D The redefinition of \type{\font} is a bit more complicated,
%D because in version 3.14159 a scaled specification was
%D introduced.
\let\normalfont = \font
\def\skipscaled scaled #1 {}
\long\def\font#1=#2 #3%
{\ifx#3s%
\skipmessage{scaled \string\font}%
\let\next=\skipscaled
\else
\skipmessage{\string\font}%
\let\next=\relax
\fi
\next#3}
%D Relaxing some font switching macros is needed because we
%D don't want any error messages during loading. These
%D unharmfull messages could be ingored.
%D
%D The next substitution is needed for determining
%D \type{\p@renwd} in the macro \type{\bordermatrix}.
\def\tenex#1%
{\skipmessage{used \string\tenex}\hskip8.75002pt}
%D We need to define \type{\tenrm} for switching to
%D \type{\rm}.
\def\tenrm%
{\skipmessage{\string\tenrm}}
%D In \CONTEXT\ all \PLAIN\ \TEX\ fonts are available, just
%D like \type{\p@renwd}. We only postpone loading them until
%D they are actually needed.
%D By bypassing fonts, some definitions become less valid so
%D we have to redefine them afterwards.
%D
%D \starttypen
%D \let\normalbordermatrix=\bordermatrix
%D
%D \def\bordermatrix%
%D {\bgroup
%D \setbox0=\hbox{\getvalue{\textface\c!mm\c!ex}B}%
%D \global\p@renwd=\wd0\relax
%D \egroup
%D \normalbordermatrix}
%D \stoptypen
%D Now we are ready for loading \PLAIN\ \TEX. Of couse we use
%D \type{\normalinput} and not \type{\input}.
\normalinput plain.tex
%D We have to take care of unwanted \PDFTEX\
%D initializations. We just want to default to \DVI\ output.
\ifx\pdftexversion\undefined
\chardef\pdfoutput=0
\else
\pdfoutput=0
\fi
%D When applicable, we also load the \ETEX\ source and
%D defintion files.
\def\gobbleETEX#1\par{}
\def\doifETEX{\ifx\eTeXversion\undefined \expandafter\gobbleETEX\fi}
\def\ifnoETEX{\ifx\eTeXversion\undefined\else\expandafter\gobbleETEX\fi}
\doifETEX \normalinput etex.src \relax
\doifETEX \normalinput etexdefs.lib \relax
\let\normalprotected = \protected
\let\normalunexpanded = \unexpanded
%D We restore some redefined primitives to their old meaning.
\let\font = \normalfont
\let\skewchar = \normalskewchar
\let\textfont = \normaltextfont
\let\scriptfont = \normalscriptfont
\let\scriptscriptfont = \normalscriptscriptfont
\let\input = \normalinput
\let\outer = \normalouter
%D We reset some of the used auxiliary macro's to
%D \type{\undefined}. One never knows what testing on them is
%D done elsewhere.
\let\skipmessage = \undefined
\let\skipscaled = \undefined
\let\normalfont = \undefined
\let\normalskewchar = \undefined
\let\normaltextfont = \undefined
\let\normalscriptfont = \undefined
\let\normalscriptscriptfont = \undefined
\let\normalinput = \undefined
\let\normalouter = \undefined
%D We want a bit more statistics and some less logging info
%D in the \type{log} file.
\def\wlog#1{}
\tracingstats=1
\endinput
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