%%
%% Ein Beispiel der DANTE-Edition
%%
%% 1. Auflage
%%
%%
%% 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[]{examinimal}
\pagestyle{empty}
\setlength\textwidth{52.91997pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{luacode}
\begin{luacode*}
function checknode(head)
while head do
if head.id==37 then
if head.char==string.byte("c") then
local n=node.new("glyph")
n.subtype=head.subtype n.char=head.char n.font=head.font
n.next = head head.prev.next = n
n.prev = head.prev head.prev = n
end
end
if head.id==0 or head.id==1 then checknode(head.head) end
head=head.next
end
return true
end
luatexbase.add_to_callback("post_linebreak_filter",checknode,"checknode")
\end{luacode*}
%StopShownPreambleCommands
\begin{document}
\fbox{abc1}
\end{document}
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