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I have the following custom listing but it throws error for lstset part that the keys are undefined. Any ideas how to fix this?

\documentclass{llncs}
\pagestyle{plain}

\usepackage[utf8]{inputenc}
\usepackage{listings}
\lstdefinelanguage{Sage}[]{Python}
{morekeywords={False,sage,True},sensitive=true}
\lstset{
  frame=none,
  showtabs=False,
  showspaces=False,
  showstringspaces=False,
  commentstyle={\ttfamily\color{dgreencolor}},
  keywordstyle={\ttfamily\color{dbluecolor}\bfseries},
  stringstyle={\ttfamily\color{dgraycolor}\bfseries},
  language=Sage,
  basicstyle={\fontsize{10pt}{10pt}\ttfamily},
  aboveskip=0.3em,
  belowskip=0.1em,
  numbers=left,
  numberstyle=\footnotesize
}
\definecolor{dblackcolor}{rgb}{0.0,0.0,0.0}
\definecolor{dbluecolor}{rgb}{0.01,0.02,0.7}
\definecolor{dgreencolor}{rgb}{0.2,0.4,0.0}
\definecolor{dgraycolor}{rgb}{0.30,0.3,0.30}
\newcommand{\dblue}{\color{dbluecolor}\bf}
\newcommand{\dred}{\color{dredcolor}\bf}
\newcommand{\dblack}{\color{dblackcolor}\bf}

\begin{document}

\section{Test}

A code example:

\begin{lstlisting}
sage: R.<x> = ZZ[]
sage: type(R.an_element())
<type 'sage.rings...Polynomial_integer_dense_flint'>
sage: R.<x,y> = ZZ[]
sage: type(R.an_element())
<type 'sage.rings...MPolynomial_libsingular'>
sage: R = PolynomialRing(ZZ, 'x', implementation='NTL')
sage: type(R.an_element())  # this is a comment
<type 'sage.rings...Polynomial_integer_dense_ntl'>
sage: def abc():
...       """
...       This should be a very long comment.
...       That should span multiple lines.
...       To illustrate what colour Sage comments look like.
...       To get a feel for the color when rendered using LaTeX.
...       """
...       return 2
\end{lstlisting}

\end{document}

1 Answer 1

1

You forgot to add \usepackage{xcolor}

Using colours in LaTeX

\documentclass{llncs}
\pagestyle{plain}
\usepackage{xcolor}

\usepackage[utf8]{inputenc}
\usepackage{listings}
\lstdefinelanguage{Sage}[]{Python}
{morekeywords={False,sage,True},sensitive=true}
\lstset{
  frame=none,
  showtabs=False,
  showspaces=False,
  showstringspaces=False,
  commentstyle={\ttfamily\color{dgreencolor}},
  keywordstyle={\ttfamily\color{dbluecolor}\bfseries},
  stringstyle={\ttfamily\color{dgraycolor}\bfseries},
  language=Sage,
  basicstyle={\fontsize{10pt}{10pt}\ttfamily},
  aboveskip=0.3em,
  belowskip=0.1em,
  numbers=left,
  numberstyle=\footnotesize
}
\definecolor{dblackcolor}{rgb}{0.0,0.0,0.0}
\definecolor{dbluecolor}{rgb}{0.01,0.02,0.7}
\definecolor{dgreencolor}{rgb}{0.2,0.4,0.0}
\definecolor{dgraycolor}{rgb}{0.30,0.3,0.30}
\newcommand{\dblue}{\color{dbluecolor}\bf}
\newcommand{\dred}{\color{dredcolor}\bf}
\newcommand{\dblack}{\color{dblackcolor}\bf}

\begin{document}

\section{Test}

A code example:

\begin{lstlisting}
sage: R.<x> = ZZ[]
sage: type(R.an_element())
<type 'sage.rings...Polynomial_integer_dense_flint'>
sage: R.<x,y> = ZZ[]
sage: type(R.an_element())
<type 'sage.rings...MPolynomial_libsingular'>
sage: R = PolynomialRing(ZZ, 'x', implementation='NTL')
sage: type(R.an_element())  # this is a comment
<type 'sage.rings...Polynomial_integer_dense_ntl'>
sage: def abc():
...       """
...       This should be a very long comment.
...       That should span multiple lines.
...       To illustrate what colour Sage comments look like.
...       To get a feel for the color when rendered using LaTeX.
...       """
...       return 2
\end{lstlisting}

\end{document}
4
  • I still get the same error in Overleaf. The problem is the keys inside lstset part.
    – pixel
    Dec 26, 2022 at 11:16
  • As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.
    – Community Bot
    Dec 26, 2022 at 11:24
  • If I copy and paste the "my code", I do not get any kind of error
    – mala97
    Dec 26, 2022 at 11:25
  • @pixel Which error do you get with the code as it is in the answer? It seems to work find with up-to-date texlive. Dec 26, 2022 at 11:25

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