Non-ASCII escape characters

Question

I'm using all ASCII characters in my code blocks, so I need to reach for non-ASCII ones for the escape characters. I expected Xetex to deal with this just fine; alas, it doesn't seem to be the case.

\documentclass{memoir}
\usepackage{listings}
\lstset{escapeinside=〈〉}
\begin{document}
\begin{lstlisting}
foo bar baz〈\textit{hello}〉
\end{lstlisting}
\end{document}

When typeset by running latexmk -xelatex foo.tex, this results in a code listing that contains "\textit{hello}" instead of "hello".

How do I use non-ASCII escape characters within lstlisting?

Answer 1

You must enable the parsing:

\documentclass{memoir}
\usepackage{listings}
\makeatletter 
\lst@InputCatcodes
\def\lst@DefEC{%
 \lst@CCECUse \lst@ProcessLetter
  ^^80^^81^^82^^83^^84^^85^^86^^87^^88^^89^^8a^^8b^^8c^^8d^^8e^^8f%
  ^^90^^91^^92^^93^^94^^95^^96^^97^^98^^99^^9a^^9b^^9c^^9d^^9e^^9f%
  ^^a0^^a1^^a2^^a3^^a4^^a5^^a6^^a7^^a8^^a9^^aa^^ab^^ac^^ad^^ae^^af%
  ^^b0^^b1^^b2^^b3^^b4^^b5^^b6^^b7^^b8^^b9^^ba^^bb^^bc^^bd^^be^^bf%
  ^^c0^^c1^^c2^^c3^^c4^^c5^^c6^^c7^^c8^^c9^^ca^^cb^^cc^^cd^^ce^^cf%
  ^^d0^^d1^^d2^^d3^^d4^^d5^^d6^^d7^^d8^^d9^^da^^db^^dc^^dd^^de^^df%
  ^^e0^^e1^^e2^^e3^^e4^^e5^^e6^^e7^^e8^^e9^^ea^^eb^^ec^^ed^^ee^^ef%
  ^^f0^^f1^^f2^^f3^^f4^^f5^^f6^^f7^^f8^^f9^^fa^^fb^^fc^^fd^^fe^^ff%
  ^^^^3008^^^^3009% angle chars for xelatex
  ^^00}
\lst@RestoreCatcodes
\makeatother
\lstset{escapeinside=〈〉}
\begin{document}
\begin{lstlisting}
foo bar baz〈\textit{hello}〉
\end{lstlisting}
\end{document}

See also The 'listings' package and UTF-8