Unicode characters in a listing environment are not colorized!

Question

When using the package listing, colorized comments will not yield colorized exotic unicode characters.

This is a minimal working example:

\documentclass{minimal}

    \usepackage{
        listings,
        color,
        fontspec
    }

    \setmainfont{Linux Libertine}

    \lstset{
      commentstyle=\color{green},
    }

\begin{document}
    \begin{lstlisting}[language=Java,showtabs=false]
        // Comments are green, yet ‘•’ and ‘≤’ are not.
    \end{lstlisting}
\end{document}

Colorizing these characters generally works within listing environments:

    \lstset{
      basicstyle=\color{green},
    }

\begin{document}
    \begin{lstlisting}[showtabs=false]
      Everything is green, even ‘•’ and ‘≤’.
    \end{lstlisting}
\end{document}

Is this a bug? How can I colorize the unicode characters within comments? I’m using TeXLive 2013 and lualatex.

Answer 1

You have to add the the non-ascii letters (this includes the quote characters) to \lst@ProcessLetter (see https://tex.stackexchange.com/a/25396/2388}

\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%
  ^^^^2022^^^^2264% add more codes here
  ^^00}
\lst@RestoreCatcodes
\makeatother