[Tex/LaTex] XML listing shows incorrect quotation marks

listings

I'm using \lstinputlisting from listings package to insert an xml file as a listing in my latex file. In the XML file the quotation marks are double quotes as normal when I view my PDF they appear as double closing inverted commas for both the opening and closing. I know that latex requires to use “ and '' for quotation marks but since I'm importing from an XML file, how can I fix this to make them appear normal(so I get proper opening quotation marks)?

Best Answer

In OT1 encoding only a limited set of quotes are available. Try T1 encoding:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{listings}
\begin{document}

\begin{lstlisting}[language=XML,basicstyle=\fontencoding{OT1}\selectfont]
<root attr1="OT1" attr2='foobar'/>
\end{lstlisting}

\begin{lstlisting}[language=XML]
<root attr1="T1" attr2='foobar'/>
\end{lstlisting}

\end{document}

Or use a typewriter font:

\documentclass{article}
\usepackage{listings}
\begin{document}

\begin{lstlisting}[language=XML,basicstyle=\ttfamily]
<root attr1="foo" attr2='bar'/>
\end{lstlisting}

\end{document}

$\ttfamily$

And I prefer something like

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[variablett]{lmodern}
\usepackage{listings}
\lstset{
  basicstyle=\ttfamily,
  columns=flexible,
}
\begin{document}

\begin{lstlisting}[language=XML]
<root attr1="foo" attr2='bar'/>
\end{lstlisting}

\end{document}

A straight single quote is available in encoding TS1 (package textcomp). In package listings this is enabled by option upquote (Thanks alexis and Paul Gaborit):

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage[variablett]{lmodern}
\usepackage{listings}
\lstset{
  basicstyle=\ttfamily,
  columns=flexible,
  upquote,
}
\begin{document}

\begin{lstlisting}[language=XML]
<root attr1="foo" attr2='bar'/>
\end{lstlisting}

\end{document}

Related Solutions

[Tex/LaTex] Package listings: Error “Undefined control sequence.” because of single-quote-symbol

Your example works well if you add the two packages to your preamble:

\usepackage{xcolor}
\usepackage{textcomp}

Tested with TeX Live 2012.

[Tex/LaTex] Inconsistent output for R language operators when using listings package

A possible manual approach is with the use of moredelim=**[is][\bfseries]{@}{@},

Can I also suggest a style? Below I have defined \lstdefinelanguage customRthree in conjunction with package courier. You can also try beramono. See for instance, Latex listings R: need mono-spaced font with bold keywords and correct caret (^).

\lstdefinelanguage{customRthree}{
    keywords={t},
    otherkeywords={<<-,\%*\%},    %% cannot add <-
    keywordstyle=\bfseries,
    moredelim=**[is][\bfseries]{@}{@}, % every character inside @ @ will be in bold face
    basicstyle=\ttfamily,
    commentstyle=\textsl,
}

Code

\documentclass[preview,border=5,convert]{standalone}

\usepackage{courier}

\usepackage{listings}           
\lstdefinelanguage{customR}{    % defined a new R entry
  keywords={t},
  otherkeywords={<<-,\%*\%},    %% cannot add <-
  keywordstyle=\bfseries,
  moredelim=**[is][\bfseries]{@}{@},
}
\lstdefinelanguage{customRtwo}{
  otherkeywords={<-,<<-,\%*\%},  %% cannot add <-
  keywordstyle=\bfseries,
  moredelim=**[is][\bfseries]{@}{@},
}

\lstdefinelanguage{customRthree}{
    keywords={t,R},
    otherkeywords={<<-,\%*\%},    %% cannot add <-
    keywordstyle=\bfseries,
    moredelim=**[is][\bfseries]{@}{@},
    basicstyle=\ttfamily,
    commentstyle=\textsl,
}

\begin{document} 

\lstset{language=R,caption={Standard R}}
\begin{lstlisting}[frame=tb]
    S <- H %*% t(pprd) %*% t(H) + R
    xest <<- xprd + kalmangain %*% (z - H %*% xprd)
}
\end{lstlisting}

\lstset{language=customR,caption={Custom R}}
\begin{lstlisting}[frame=tb]
    S @<-@ H %*% t(pprd) %*% t(H) + R
    xest @<<-@ xprd + kalmangain %*% (z - H %*% xprd)
}
\end{lstlisting}

\lstset{language=customRtwo,caption={Custom R (alt.)}}
\begin{lstlisting}[frame=tb]
    S <- H %*% t(pprd) %*% t(H) + R
    xest @<@<- xprd + kalmangain %*% (z - H %*% xprd)
}
\end{lstlisting}

\begin{lstlisting}[frame=tb,language=customRthree,caption={Custom R 3}]
    S @<-@ H %*% t(pprd) %*% t(H) + R
    xest @<<-@ xprd + kalmangain %*% (z - H %*% xprd)
}
\end{lstlisting}

\end{document}

Output

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