listings and unicode-math scriptsize bad

[wspr]

Description

Unicode-math and/or listings has a problem if basicstyle=\scriptsize is set and the maths fonts haven't been initialised. (IMO I don't think listings should be using maths characters, but maybe there's a good reason.)

Check/indicate

• [x] Relevant for XeTeX
• [x] Relevant for LuaTeX
• [x] Issue tracker has been searched for similar issues?
• [x] Links to discussion if appropriate: https://tex.stackexchange.com/questions/423652/error-in-listings-file-when-combined-with-lstset-and-unicode-math-package/423661#423661

Minimal example demonstrating the issue

\documentclass{article}
\usepackage{unicode-math}
\usepackage{listings}
\lstset{basicstyle=\scriptsize}
\begin{document}
\lstinputlisting{test.cpp}
\end{document}

Further details

Workaround: \AtBeginDocument{\sbox0{\scriptsize $x$}} or similar.

[u-fischer]

The problem is that fontspec/unicode-math reads font dimens with luacode. And while catcodes in the tex code are frozen when the code is read this is not true for values you get from directlua. So when trying to setup the font in the middle of lstlisting (which activates all chars) things explodes.

The problem can be resolved by explicitly setting the catcode table when reading the dimens in the first argument of tex.sprint:

\documentclass{article}
\usepackage{unicode-math}
\RequirePackage{luacode}
\begin{luacode}
local latexcatcodetable = luatexbase.registernumber("catcodetable@latex")
function fontspec.mathfontdimen(fnt, str)
    local mathdimens = luaotfload.aux.get_math_dimension(fnt, str)
    if mathdimens then
        tex.sprint(latexcatcodetable,mathdimens)
        tex.sprint(latexcatcodetable,"sp")
    else
        tex.sprint(latexcatcodetable,"0pt")
    end
end
\end{luacode}

\usepackage{listings}

\lstset{basicstyle=\scriptsize}
\begin{document}

\begin{lstlisting}
-
\end{lstlisting}

\end{document}

[davidcarlisle]

you shouldn't need luatexbase packae

\catcodetable@latex

is pre-defined in the format, see

https://github.com/wspr/fontspec/issues/230

which was same issue in fontspec

On 29 March 2018 at 10:09, u-fischer notifications@github.com wrote:

The problem is that fontspec/unicode-math reads font dimens with luacode. And while catcodes in the tex code are frozen when the code is read this is not true for values you get from directlua. So when trying to setup the font in the middle of lstlisting (which activates all chars) things explodes.

The problem can be resolved by explicitly setting the catcode table when reading the dimens in the first argument of tex.sprint:

\documentclass{article} \usepackage{unicode-math} \RequirePackage{luacode} \begin{luacode}

function fontspec.mathfontdimen(fnt, str) local mathdimens = luaotfload.aux.get_math_dimension(fnt, str) if mathdimens then tex.sprint(luatexbase.catcodetables.latex,mathdimens) tex.sprint(luatexbase.catcodetables.latex,"sp") else tex.sprint(luatexbase.catcodetables.latex,"0pt") end end \end{luacode}

\usepackage{listings}

\lstset{basicstyle=\scriptsize} \begin{document}

\begin{lstlisting}

\end{lstlisting}

\end{document}

(this needs the luatexbase package, I'm not sure how to get the table with kernel code alone.)

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