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-rw-r--r--luatexbase-regs.dtx76
1 files changed, 69 insertions, 7 deletions
diff --git a/luatexbase-regs.dtx b/luatexbase-regs.dtx
index b5af110..e93d57f 100644
--- a/luatexbase-regs.dtx
+++ b/luatexbase-regs.dtx
@@ -135,12 +135,66 @@ and the derived files
%
% \section{Implementation}
%
-% \subsection{\TeX\ package}
-%
% \begin{macrocode}
%<*texpackage>
% \end{macrocode}
%
+% \subsection{Preliminaries}
+%
+% Reload protection, especially for Plain TeX.
+%
+% \begin{macrocode}
+ \csname lltxb@regs@loaded\endcsname
+\expandafter\let\csname lltxb@regs@loaded\endcsname\endinput
+% \end{macrocode}
+%
+% Package declaration.
+%
+% \begin{macrocode}
+\begingroup
+ \expandafter\ifx\csname ProvidesPackage\endcsname\relax
+ \def\x#1[#2]{\immediate\write16{Package: #1 #2}}
+ \else
+ \let\x\ProvidesPackage
+ \fi
+\expandafter\endgroup
+\x{luatexbase-regs}[2010/01/14 Registers allocation for LuaTeX (mpg)]
+% \end{macrocode}
+%
+% Make sure \LuaTeX\ is used.
+%
+% \begin{macrocode}
+\begingroup\expandafter\expandafter\expandafter\endgroup
+\expandafter\ifx\csname RequirePackage\endcsname\relax
+ \input ifluatex.sty
+\else
+ \RequirePackage{ifluatex}
+\fi
+\ifluatex\else
+ \begingroup
+ \expandafter\ifx\csname PackageWarningNoLine\endcsname\relax
+ \def\x#1#2{\begingroup\newlinechar10
+ \immediate\write16{Package #1 warning: #2}\endgroup}
+ \else
+ \let\x\PackageWarningNoLine
+ \fi
+ \expandafter\endgroup
+ \x{luatexbase-regs}{LuaTeX is required for this package.^^J
+ Aborting package loading.}
+ \expandafter\endinput
+\fi
+% \end{macrocode}
+%
+% Make sure the catcode of @ is correct, especially for Plain~\TeX.
+%
+% \begin{macrocode}
+\expandafter\edef\csname lltxb@AtEnd\endcsname{%
+ \catcode64 \the\catcode64\relax}
+\catcode64 11
+% \end{macrocode}
+%
+% \subsection{Main content}
+%
% If running \LaTeX, load \texttt{etex.sty}. If not, either
% \texttt{etex.src} was loaded at format generation time, or we cannot do
% anything.
@@ -154,13 +208,22 @@ and the derived files
%
% To the best of my (mpg) knowledge, all Plain-based formats built with
% \eTeX-enabled engines in \TeX\,Live load \texttt{etex.src}. However,
-% let's be careful and check that \texttt{etex.sty} or \texttt{src} is
+% let's be careful and check that \texttt{etex.sty} or \texttt{etex.src} is
% loaded.
%
% \begin{macrocode}
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname et@xins\endcsname\relax
- %%TODO: issue a warning here
+ \begingroup
+ \expandafter\ifx\csname PackageWarningNoLine\endcsname\relax
+ \def\x#1#2{\begingroup\newlinechar10
+ \immediate\write16{Package #1 warning: #2}\endgroup}
+ \else
+ \let\x\PackageWarningNoLine
+ \fi
+ \expandafter\endgroup
+ \x{luatexbase-regs}{etex macros not loaded!^^J
+ Registers allocation scheme will not be extended.}
\else
% \end{macrocode}
%
@@ -226,12 +289,13 @@ and the derived files
\expandafter\let\csname newdimen\endcsname\globdimen
\expandafter\let\csname newskip\endcsname\globskip
\expandafter\let\csname newbox\endcsname\globbox
+\fi
% \end{macrocode}
%
% That's all folks!
%
% \begin{macrocode}
-\fi
+\lltxb@AtEnd
%</texpackage>
% \end{macrocode}
%
@@ -248,9 +312,7 @@ and the derived files
% enough for testing purposes.)
%
% \begin{macrocode}
-%<testplain>\catcode 64 11
%<testplain>\input luatexbase-regs.sty
-%<testplain>\catcode 64 12
%<testlatex>\RequirePackage{luatexbase-regs}
%<*testplain,testlatex>
\def\checkregister#1{%