Graphics, Figures & Tables ⇒ listings | Problems with Greek Letters

[marius63]

Is there a bug reporting/discussing channel for this? Is this it?

Nice Ada source code, with Greek letter variables, UTF-8 encoded:

nice_ada_code.png (21.12 KiB) Viewed 9131 times

And here is how LaTeX typesets it, via package listings:

ada_code_latex.png (30.14 KiB) Viewed 9131 times

Note how line 49 is perfectly typeset, but the variables at the start of lines 42, 43 have moved to end of the previous line.

Any help greatly appreciated. Thanks.

[Stefan Kottwitz]

Hi Mario,

perhaps show a small compilable code example which produced that for you, so we also know your listings settings, possibly we would see the cause. Looking only at the output doesn't help much.

Stefan

[marius63]

Thanks. LaTeX input and contents of the source code file follows.

Code: Select all

\documentclass[12pt,a4paper]{report}
\usepackage{ucs}
\usepackage[utf8]{inputenc}
\usepackage{listings}
\lstloadlanguages{Ada,C}
\usepackage{textgreek}

\begin{document}

\lstset{
language=Ada,
basicstyle={\rmfamily\scriptsize},
numbers=left,
numberstyle=\tiny,
breaklines=true,
showstringspaces=false,
extendedchars=false
}

\lstinputlisting{adacode.txt}

\end{document}

adacode.txt

Code: Select all

      A : Real_Vector (1 .. N);
      λ : Real_T := 1.0;
      α : Real_T := 1.0;
      I : Real_Matrix := Unit_Matrix (N, 1, 1);
      M : Real_Matrix_Ptr_T;
      Items : Page_Item_Array_T (1 .. N);
   begin
      --  Setup the matrix
      M := new Real_Matrix (1 .. N, 1 .. N);
      M.all := λ * I + α * Transpose (W.all);

[Stefan Kottwitz]

I see! With the standard listings package, UTF-8 characters are a problem, they need to be escaped somehow. There's the package listingsutf8 you could use. Perhaps work with math symbols instead of Unicode character.

Stefan

[marius63]

Thanks. I checked listingsutf8 but from its documentation it seems it requires the source code to be able to be transformed into a one byte encoding. That sounds useless and silly. If the source code could be represented in one byte I would not be using UTF8 in the first place. Maybe they are thinking of a special one byte encoding that combines ASCII and Greek. But then we would loose Latin1 or other codes that are also used in the source code (Portuguese literals for instance).

You cannot use \lamba et al. either because the source code is in a distinct language from LaTeX (then it would not compile).

The solution is Unicode. I am only interested in fixing the Unicode in LaTeX. Thanks.

[shadgrind]

Have you tried adding inputencoding=utf8 in your \lstset command? Another thing to try is \usepackage[utf8x]{inputenc}, instead of \usepackage[utf8]{inputenc}, in the preamble.

[marius63]

Have you tried adding inputencoding=utf8 in your \lstset command? Another thing to try is \usepackage[utf8x]{inputenc}, instead of \usepackage[utf8]{inputenc}, in the preamble.

Thanks. Yes I've tried. No luck:-(

[shadgrind]

One alternative is to use XeTeX, so that you could use TrueType fonts with real Unicode support. The minted package seems to have better Unicode support than the listings package. This worked for me with your adacode.txt file:

Code: Select all

\documentclass[12pt,a4paper]{report}
\usepackage{fontspec}
\usepackage{minted}
\setmainfont{DejaVu Serif}
\setsansfont{DejaVu Sans}
\setmonofont{DejaVu Sans Mono}

\begin{document}
\usemintedstyle{emacs}
\inputminted[linenos=true]{ada}{adacode.txt}

\end{document}

Then compile like this:

Code: Select all

xelatex -shell-escape myfile.tex

The shell escape is necessary because minted depends on the Pygments Python library and utilities.

[marius63]

Great! Now I'm on a complex, critical mission and cannot change installation midway, but definitely will try XeLaTeX in the future. Thanks a lot.

[localghost]

It works if you allow escaping to math mode thus typeset all Greek letter as math symbols.

Code: Select all

\documentclass[12pt,a4paper]{report}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{listings}

\lstloadlanguages{Ada,C}
\lstset{%
  language=Ada,
  basicstyle=\scriptsize,
  numbers=left,
  numberstyle=\tiny,
  breaklines=true,
  showstringspaces=false,
  mathescape=true
}

\begin{document}
  \lstinputlisting{adacode.txt}
\end{document}

But this requires modifications to your Ada code.

Code: Select all

  A : Real_Vector (1 .. N);
  $\lambda$ : Real_T := 1.0;
  $\alpha$ : Real_T := 1.0;
  I : Real_Matrix := Unit_Matrix (N, 1, 1);
  M : Real_Matrix_Ptr_T;
  Items : Page_Item_Array_T (1 .. N);
begin
  --  Setup the matrix
  M := new Real_Matrix (1 .. N, 1 .. N);
  M.all := $\lambda$ * I + $\alpha$ * Transpose (W.all);

For details see Section 4.14 of the listings manual.


Thorsten