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%%
%% Ein Beispiel der DANTE-Edition
%%
%% 1. Auflage
%%
%% Beispiel 01-02-12 auf Seite 14.
%%
%% Copyright (C) 2013 Herbert Voss
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%
%%
%% ====
% Show page(s) 1
%%
%%
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
%\usepackage[margin=5mm,a6paper]{geometry}
\setlength\parindent{0pt}\sloppy
%StartShownPreambleCommands
\directlua{tex.enableprimitives("",tex.extraprimitives('luatex'))}% \latelua{}
\newcount\gstatelevel
\def\pdfsave{\latelua{pdf.print("page", "q\string\n")}}
\def\pdfrestore{\latelua{pdf.print("page", "Q\string\n")}}
\def\pdflocal#1#2{\begingroup\ifnum\currentgrouplevel=\gstatelevel
\else \gstatelevel=\currentgrouplevel \pdfsave \aftergroup\pdfrestore\fi
\latelua{pdf.print"#1\string\n"}#2\endgroup}
\def\flip#1{\pdflocal{-1 0 0 -1 20 6 cm}{\hbox to0pt{#1\hss}}%
\hbox to20bp{\hss}}
\def\red#1{\pdflocal{0 1 1 0 k}{#1}}
%StopShownPreambleCommands
\begin{document}
The first macro applies a transformation to a \flip{text} object, the second
applies a color (\red{red online}, \red{gray in print}). If used separately,
they work just fine. If used as \verb|\flip{\red{text}}|, it's still ok:
\flip{\red{text}}. Now try to say \verb|\red{\flip{text}}|: \red{\flip{text}}.
The text is transformed and colored as expected. But all the rest of the page
is broken, as its content is completely displaced!
\end{document}
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