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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 1. Auflage
+%%
+%% Beispiel 04-04-10 auf Seite 94.
+%%
+%% 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,libertine}
+\begin{luacode}
+ local translate={c='ĉ', g='ĝ', h='ĥ', j='ĵ', s='ŝ', u='û'}
+ local function get_char_token(char)
+ return token.create(unicode.utf8.byte(char))
+ end
+ local function get_token_char(tok)
+ return tok[1] == 11 and unicode.utf8.char(tok[2])
+ end
+ local circumflex_token = get_char_token("^")
+ local function is_circumflex(tok)
+ return tok[1] == circumflex_token[1] and tok[2] == circumflex_token[2]
+ and tok[3] == circumflex_token[3]
+ end
+ local function in_math_mode()
+ local n = tex.nest[tex.nest.ptr]
+ return n.mode == 235 or n.mode == -235
+ end
+ local function texperanto()
+ local t = token.get_next()
+ if not in_math_mode() and is_circumflex(t) then
+ local u = token.get_next()
+ local c = get_token_char(u)
+ if c then
+ local d = translate[c]
+ if d then return get_char_token(d) else return {t, u} end
+ else return {t, u} end
+ else return t end
+ end
+ luatexbase.add_to_callback("token_filter", texperanto, "texperanto")
+\end{luacode}
+%StopShownPreambleCommands
+\begin{document}
+^c ^g ^h ^j ^s ^u $a^2+b^2=c^2$ und $a^c\le h^j$
+\end{document}