script detection faulty with xetex?

[u-fischer]

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Description

with xelatex \fontspec_if_script:nTF detects scripts which are not in the font

Check/indicate

• [ X] Relevant for XeTeX
• [ ] Relevant for LuaTeX
• [X ] Issue tracker has been searched for similar issues?

Minimal example demonstrating the issue

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Sanskrit 2003}
\begin{document}

\ExplSyntaxOn

deva:~\fontspec_if_script:nTF{deva}{yes}{no}\par

deva2:~\fontspec_if_script:nTF{deva2}{yes}{no}

\ExplSyntaxOff

\end{document}

Further details

Output with xelatex

Output with lualatex (using an experimental fontloader, but I doubt that it matters):

Output of otfinfo

C:\Windows\Fonts>otfinfo -s Sanskrit2003.ttf
deva            Devanagari

Perhaps related: issue #317

[wspr]

Ah, NB dev2 not deva2. This is because XeTeX has to jump through hoops to turn the 4-digit code into an integer to then check against low-level return integers from \XeTeXOTscripttag, whereas LuaTeX can pass through the string directly to luaotfload. So XeTeX truncates the deva2 tag to deva which works.

I could add error checking to ensure the tl length of the script tag is exactly 4, I suppose. WDYT?

[u-fischer]

Regarding dev2 against deva2: It is simply to hot here currently.

[wspr]

I just tried this out again and I think I must have added a check and forgotten to close this issue:

./fstest.tex:23: Package fontspec Error: OpenType tag ‘deva2’ is too long; scri
pt, language,
(fontspec)                and feature tags must be four characters or fewer.

(no idea why the text wrapping is broken... I liked our old LaTeX3 errors :))