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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}
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