fontloader error when trying to mix LRT/RTL text in paragraphs

[ralessi]

With luaotfload v2.7 (from TeXLive 2016 pretest), I cannot anymore mix RTL and LTR text in one and the same paragraph, namely without inserting blank lines before \textdir TRT and the like.

Here is a mwe:

\documentclass{article}

\usepackage{fontspec}

\newfontfamily\arabicfont[Script=Arabic]{Amiri}

\begin{document}

\section*{This works:}
English text: hello, world.

\textdir TRT\arabicfont
دَخَكَ مُبتَسِمًا

\textdir TLT\normalfont
English text back again.

\section*{But this doesn't}
English text: hello, world.
\textdir TRT\arabicfont
دَخَكَ مُبتَسِمًا
\textdir TLT\normalfont
English text back again.

\end{document}

This mwe gives me the following error: [...]texmf/tex/luatex/luaotfload/fontloader-2016-04-27.lua:13071: attempt to index local 'i' (a nil value)

Furthermore, if I force the compilation, I get this:

Which is wrong, for we should read the last line as follows:

English text: hello, world. دَخَلَ مُبتَسِمًا English text back again.

Many thanks in anticipation for your help. -- Robert

[ralessi]

Furthermore, if I force the compilation, I get this [...]

I am wrong, sorry. The brave old TeXLive 2015 and luaotfload v2.6 give the same word order.

[ralessi]

So here is the actual issue in my opinion:

With luaotfload v2.7 (from TeXLive 2016 pretest), I cannot anymore mix RTL and LTR text in one and the same paragraph, namely without inserting blank lines before \textdir TRT and the like.

Here is a mwe:

\documentclass{article}

\usepackage{fontspec}

\newfontfamily\arabicfont[Script=Arabic]{Amiri}

\begin{document}

\section*{This works:}
English text: hello, world.

\textdir TRT\arabicfont
دَخَكَ مُبتَسِمًا

\textdir TLT\normalfont
English text back again.

\section*{But this doesn't}
English text: hello, world.
\textdir TRT\arabicfont
دَخَكَ مُبتَسِمًا
\textdir TLT\normalfont
English text back again.

\end{document}

This mwe gives me the following error: [...]texmf/tex/luatex/luaotfload/fontloader-2016-04-27.lua:13071: attempt to index local 'i' (a nil value)

[ralessi]

NB1: I think fontspec is not implicated for I get the same error with this preamble:

\documentclass{article}

\usepackage{luaotfload}
\font\normalfont = {name:Libertinus Serif:script=latn} at 12pt
\font\arabicfont = {name:Amiri:script=arab} at 12pt

\begin{document}

NB2: \textdir xyz must be combined with \normal|arabicfont for the error to come out.

[phi-gamma]

Hi,

thanks for the report!

I think this was an instance of this bug: https://mailman.ntg.nl/pipermail/ntg-context/2016/085321.html
In any case, it doesn’t occur anymore with the latest fontloader code
so please wait for the next Luaotfload release.

BTW I took the liberty and added your example to the test repo. It’s
pretty useful in triggering some less common code paths:
https://bitbucket.org/phg/lua-la-tex-tests/src/60fbd26ce8cfcef9f3fa0955524b314c552a8c6b/plain/pln-arabic-2-amiri-issue-349.tex

Philipp

[ralessi]

Hi Philipp,

Excellent. I will test it as soon as it is out. Good to hear that this will be part of the test repo: so we kill two birds with one stone.

Robert

[ralessi]

Hi Philipp,

I still have an issue in this mwe:

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Libertinus Serif}

\newfontfamily\arabicfont[Script=Arabic]{Amiri}

\begin{document}

Hello: this is not so efficient:
\textdir TRT\arabicfont دَخَلَ مُبتَسِمًا

Hello: this is good:
\textdir TRT\arabicfont دَخَلَ مُبتَسِمًا

\end{document}

It gives me this error:

error: ...xmf-dist/tex/luatex/luaotfload/fontloader-2016-05-04.lua:13129: attempt to index local 'i' (a nil value)
.
l.11

Oddly, the culprit is the word 'efficient' on line 9; if you take it out, or replace it with 'good', the mwe compiles smoothly. Is it because of the 'ffi' ligature?

Robert

[phi-gamma]

Hi Robert,

thanks for testing.

It gives me this error:

error: ...xmf-dist/tex/luatex/luaotfload/fontloader-2016-05-04.lua:13129: attempt to index local 'i' (a nil value)

Confirmed. Looks like this is triggered by the transition from
Latin to Arabic script:

https://bitbucket.org/phg/lua-la-tex-tests/src/684543a96a38ca647ca63c3301036b18fa39d7a0/latex/ltx-arabic-4.tex

I’ll file a bug with Hans.

Best,
Philipp

[ralessi]

Great! I can't wait to test this new release! Many thanks, -R

Le 15 juin 2016 00:02:44 HAEC, Philipp Gesang notifications@github.com a écrit :

Closed #349 via 195d57d.

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#349 (comment)

[phi-gamma]

···<date: 2016-06-14, Tuesday>···<from: Robert Alessi>···

Great! I can't wait to test this new release! Many thanks, -R

Don’t thank me just yet ;) I still have to run another batch of
tests before releasing.

[ralessi]

Fingers crossed! If I understood well, this fontloader update does not address issue #361 yet. Is that so? Many thanks again for your efforts. -R