Created
September 30, 2012 05:31
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\directlua の弱点をつく件について
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%#! lualatex | |
\documentclass[a4paper]{article} | |
\def\length#1{% | |
\directlua{\unexpanded{ | |
require('lualibs-unicode') | |
local input = [[#1]] | |
local state = 'r' | |
% print(input) | |
for i = 1, utf.len(input) do | |
local r = utf.byte(utf.sub(input, i, i)) | |
if state == 'r' then | |
tex.write('*') | |
if tex.getcatcode(r) == 0 then state = 'csb' end | |
elseif state == 'csb' then | |
if tex.getcatcode(r) == 11 then state = 'cs' else state = 'r' end | |
elseif state == 'cs' then | |
if tex.getcatcode(r) == 10 then | |
state = 'r' | |
elseif tex.getcatcode(r) ~= 11 then | |
tex.write('*') | |
state = 'r' | |
end | |
end | |
end | |
}}} | |
\begin{document} | |
\escapechar=-1 | |
\edef\result{\length{\expandafter\expandafter\expandafter}} | |
\escapechar=`\\ | |
\def\check{***} | |
\ifx\result\check OK\else NG\fi | |
\edef\result{\expandafter\length\expandafter{\csname ?TeX\endcsname}} | |
\def\check{*} | |
\ifx\result\check OK\else NG\fi | |
\end{document} |
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