9

I am using the listings package to include GAUSS code to Latex.

E.g. like this:

\lstset{
emph={proc,retp,endp,local}, emphstyle=\color{blue}\textbf,
emph={[2]=,.^,./,=}, emphstyle={[2]\color{red}}
}

\begin{lstlisting}
proc(1) = tdist(n,v);
local x, z, z2, u, t;
x=rndn(n,1); 
z=rndn(n,v);
z2=z.^2; 
t=x./((U./v)^(1/2));
retp(t);
endp;
\end{lstlisting}

While the strings (proc, retp etc.) are highlighted, the math operators (=, *, /) are not. What am I doing wrong here?

14

You can't do this with the emph key. But you can do it using the literate key:

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

\lstset{
emph={proc,retp,endp,local}, emphstyle={\color{blue}\textbf},
literate={./}{{{\color{red}./}}}2 {.^}{{{\color{red}.\^{}}}}2 {=}{{{\color{red}=}}}1
}

\begin{lstlisting}
proc(1) = tdist(n,v);
local x, z, z2, u, t;
x=rndn(n,1); 
z=rndn(n,v);
z2=z.^2; 
t=x./((U./v)^(1/2));
retp(t);
endp;
\end{lstlisting}

\end{document}

Note that all the braces are required, since you need to limit the scope of the \color command.

output of code

| improve this answer | |
  • This works quite fine with a low number of characters but fails for whole words regarding spacing. See tex.stackexchange.com/questions/277486 – stefanct Nov 9 '15 at 20:11
  • The problem is that the definition of colors is mixed with the definition of the language. I would normally prefer to define the syntactic categories in a package, but choose/customize colors in the document I am typesetting. This solution does not help :( – Andrzej Wąsowski Jun 22 at 12:03
4

I would like to add some observations to Alan's answer, since I also ran into that issue, landed here and I see your question is only partially answered.

If you want operators like / or * coloured, too, you might get in trouble with comments in code. As literate will break the way comments will be recognized by the listings package. Here is an example:

/** 
 * This is a 
 * comment ...
 **/
let java = s / c + r * i - p + t    // and this is some code

Screenshot:

screenshot0

Now you want to highlight / and * in the equation, but it breaks the commets:

literate=%
  {+}{{{\color{Red}+}}}1
  {-}{{{\color{Red}-}}}1
  {*}{{{\color{Red}*}}}1
  {/}{{{\color{Red}/}}}1
  {=}{{{\color{Red}=}}}1

Result:

Screenshot1

Obviously, the comments both are broken. Now I played around with adding spaces to the pattern, but with insufficient results.

literate=%
  {\ +}{{{\color{Red}\ +}}}1
  {\ -}{{{\color{Red}\ -}}}1
  {\ *}{{{\color{Red}\ *}}}1
  {\ /}{{{\color{Red}\ /}}}1
  {\ =}{{{\color{Red}\ =}}}1

The block comment is now recognized, but the one-line comment not.

Screenshot2

So, why not appending a whitespace, too?

literate=%
  {\ +\ }{{{\color{Red}\ +\ }}}1
  {\ -\ }{{{\color{Red}\ -\ }}}1
  {\ *\ }{{{\color{Red}\ *\ }}}1
  {\ /\ }{{{\color{Red}\ /\ }}}1
  {\ =\ }{{{\color{Red}\ =\ }}}1

This is the closest I could get to the desired result.

Screenshot3

You can see it somehow shrinks the whitespaces. Some could dive into the dozens of different TeX whitespaces from here. But you'll get an idea.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.