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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 1. Auflage
+%%
+%% Beispiel 04-04-3 auf Seite 88.
+%%
+%% 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}
+\setlength\parindent{0pt}
+%StartShownPreambleCommands
+\usepackage{luacode}
+\begin{luacode}
+function funny(data)
+ if string.find(data,"\\") then return data
+ else return string.reverse(data)
+ end
+end
+\end{luacode}
+%StopShownPreambleCommands
+\begin{document}
+\directlua{luatexbase.add_to_callback("process_input_buffer",funny,"funny")}
+Dies ist eine ganz normale Zeile, die unsinnigen Text
+zeigt, der hier auch noch weitergeht :-) Nur
+dies ist ok :-) \ldots
+\end{document}