Mrthfx

I have a fixed column listing on which I have escapped to LaTeX to write a proportional bit of text. The following pic illustrates what I have:

On the green box, the proportional text have perfectly aligned to the monospaced text, probably by accident, but that's exactly what I want.

On the red box, because of the subscript there, the text did not align properly to the fixed columns. (In this case, I believe the spacing should be increased so that the semicolon will align to the space above it.)

How could I justify escaped text (possibly with math mode equations) so that it would align to the closest number of fixed-width columns inside the listing?

Here's the code to reproduce the above table:

documentclass{article}



usepackage[utf8]{inputenc}

usepackage{graphicx}

usepackage{listings}

usepackage{color}

usepackage{mathtools}

usepackage{booktabs}



begin{document}



pagestyle{empty}



lstnewenvironment{rgxbc}

  {lstset{

    basicstyle=ttfamily,

    columns=fixed,

    escapeinside={@}{@}

    }

  }

  {}



subsection{Relation to NFAs}



begin{center}

  begin{tabular}{*3l}

    toprule

    multicolumn{1}{c}{emph{Expression}} & multicolumn{1}{c}{emph{NFA}} & multicolumn{1}{c}{emph{Bytecode}} \

    midrule

    $texttt{e}_{1}texttt{e}_{2}$ &

    ...

    &

    begin{rgxbc}

     @textnormal{textit{code for }}$texttt{e}_{1}$@;

     @textnormal{textit{code for }}$texttt{e}_{2}$@;

    end{rgxbc}

    \

    hline

    $texttt{e}_{1}| texttt{e}_{2}$ &

    ...

    &

    begin{rgxbc}

     SPL .L1, .L2;

.L1: @textnormal{textit{code for }}$texttt{e}_{1}$@;

     JMP .L3;

.L2: @textnormal{textit{code for }}$texttt{e}_{2}$@;

.L3:

    end{rgxbc}

    \

    hline

    $texttt{e?}$ &

    ...

    &

    begin{rgxbc}

     SPL .L1, .L2;

.L1: @textnormal{textit{code for }}$texttt{e}$@;

.L2:

    end{rgxbc}

    \

    hline

    $texttt{e+}$ &

    ...

    &

    begin{rgxbc}

.L1: @textnormal{textit{code for }}$texttt{e}$@;

     SPL .L1, .L2;

.L2:

    end{rgxbc}

    \

    hline

    $texttt{e*}$ &

    ...

    &

    begin{rgxbc}

.L1: SPL .L2, .L3;

.L2: @textnormal{textit{code for }}$texttt{e}$@;

     JMP .L1;

.L3:

    end{rgxbc}

    \

    bottomrule

  end{tabular}

end{center}



end{document}

You can force all the escaped code into a box a size a multiple of the listings fixed column width

documentclass{article}



usepackage[utf8]{inputenc}

usepackage{graphicx}

usepackage{listings}

usepackage{color}

usepackage{mathtools}

usepackage{booktabs}



makeatletter

defzz#1{{%

setbox0hbox{{#1}}%

count0=wd0

dividecount0 by dimexprlst@widthfixedrelax

dimen0=count0 dimexprlst@widthfixedrelax

ifdimdimen0<wd0 advancedimen0 lst@widthfixedfi

makebox[dimen0][l]{usebox0}}}%



makeatletter





begin{document}



pagestyle{empty}



lstnewenvironment{rgxbc}

  {lstset{

    basicstyle=ttfamily,

    columns=fixed,

    escapeinside={@}{@}

    }

  }

  {}







subsection{Relation to NFAs}



begin{center}

  begin{tabular}{*3l}

    toprule

    multicolumn{1}{c}{emph{Expression}} & multicolumn{1}{c}{emph{NFA}} & multicolumn{1}{c}{emph{Bytecode}} \

    midrule

    $texttt{e}_{1}texttt{e}_{2}$ &

    ...

    &

    begin{rgxbc}

     @zz{textnormal{textit{code for }}$texttt{e}_{1}$}@;

     @zz{textnormal{textit{code for }}$texttt{e}_{2}$}@;

    end{rgxbc}

    \

    hline

    $texttt{e}_{1}| texttt{e}_{2}$ &

    ...

    &

    begin{rgxbc}

     SPL  .L1, .L2;

.L1: @zz{textnormal{textit{code for }}$texttt{e}_{1}$}@;

     JMP  .L3;

.L2: @zz{textnormal{textit{code for }}$texttt{e}_{2}$}@;

.L3:

    end{rgxbc}

    \

    hline

    $texttt{e?}$ &

    ...

    &

    begin{rgxbc}

     SPL  .L1, .L2;

.L1: @zz{textnormal{textit{code for }}$texttt{e}$}@;

.L2:

    end{rgxbc}

    \

    hline

    $texttt{e+}$ &

    ...

    &

    begin{rgxbc}

.L1: @zz{textnormal{textit{code for }}$texttt{e}$}@;

     SPL  .L1, .L2;

.L2:

    end{rgxbc}

    \

    hline

    $texttt{e*}$ &

    ...

    &

    begin{rgxbc}

.L1: SPL  .L2, .L3;

.L2: @zz{textnormal{textit{code for }}$texttt{e}$}@;

     JMP  .L1;

.L3:

    end{rgxbc}

    \

    bottomrule

  end{tabular}

end{center}



end{document}