From: Philipp Gesang <gesang@stud.uni-heidelberg.de>
To: hajtmar@gyza.cz, mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Problem with Lua processing UTF8 substrings
Date: Wed, 1 Feb 2012 21:05:55 +0100 [thread overview]
Message-ID: <20120201200555.GA1647@phlegethon> (raw)
In-Reply-To: <4F2991C9.2090602@gyza.cz>
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On 2012-02-01 20:26, Jaroslav Hajtmar wrote:
> I want to use Lua to write characters (substrings) from a string,
> but I get an error message:
>
> ! String contains an invalid utf-8 sequence.
>
> Can you please someone help?
Have you tried the unicode library? The standard string library
operates on bytes, therefore extracting a single byte yields an
incomplete multibyte char if the codepoint is beyond ascii.
·································································
\def\mymacro#1{%
\startluacode
local utf = unicode.utf8
local target = [==[\detokenize{#1}]==]
for i=1, utf.len(target) do
context(utf.sub(target,i,i)..", ")
end
\stopluacode%
}
%% alternatively, use utfcharacters
\define[1]\myothermacro{%
\startluacode
local result = { }
for i in string.utfcharacters[==[\detokenize{#1}]==] do
result[\letterhash result+1] = i
end
context(table.concat(result, ", "))
\stopluacode
}
\starttext
\mymacro{šěřěžřýčřčžáýčý}\par
\myothermacro{šěřěžřýčřčžáýčý}
\stoptext
·································································
(Lazy people would just do a “local string = unicode.utf8” at the
top of the file.)
Regards
Philipp
>
> Thanks
> Jaroslav Hajtmar
>
> Here is my minimal example:
>
> \def\mymacro#1{\ctxlua{for i=1, string.len('#1') do
> context(string.sub('#1',i,i)..", ") end}}
>
> \starttext
>
> %\mymacro{šěřěžřýčřčžáýčý} % Here is a problem
> \mymacro{asdfghjklqwertt} % Here is all OK
>
> \stoptext
>
>
>
>
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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> ___________________________________________________________________________________
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2012-02-01 20:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 19:26 Jaroslav Hajtmar
2012-02-01 20:05 ` Philipp Gesang [this message]
2012-02-01 20:17 ` Jaroslav Hajtmar
2012-02-01 20:35 ` Philipp Gesang
2012-02-01 20:38 ` Jaroslav Hajtmar
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