NewEnviron, \BODY and lstlisting

Question

I was trying to understand egreg's answer to Hide content to show later, and I noticed that there were some problems when using lstlisting or tcblisting environments inside the solution environment proposed by egreg, while other environments like figureor proof seem to work fine.

I looked to several related questions (like Using an environ environment with \newenvironment and How to remove \BODY defined in the algorithmic package?), and I think (but am not sure) that the conflict comes from the listing package which possibly defines a \BODY command, as does environ.

For example, a minimal non working example is the following :

\documentclass[10pt]{book}
\usepackage{environ}
\usepackage{listings}

\NewEnviron{solution}{\BODY}

\begin{document}

\begin{solution}
This is an environment containing code.
\begin{lstlisting}
My code
\end{lstlisting} 
\end{solution}


\end{document}

With this code, I have the following error : Text dropped after begin of listing

Where does this error comes from, and how can I avoid it ? My goal would be to have a solution environment, defined with \NewEnviron, and which could contain an lstlistingor a tcblisting environment.

Note : I am aware that in the code I have defined, I could use \newenvironment instead of \NewEnviron, but the environment I want (which is exactly the one in egreg's answer to Hide content to show later) really needs the features of \NewEnviron, especially the \BODY macro, since I want to store the content of \solution in order to display it later.

You can't have verbatim material like lstlisting inside of another command. Environments defined with environ look like environments but in many aspects behave like commands => you can't have verbatim material in an environment defined with environ — cgnieder, Jul 27 '15 at 10:22
Thanks a lot, my guess for the origin of the problem was wrong, and I realize that my question is a total duplicate. (For the sake of completeness, the solution uses \cprotectEnv). — mvienney, Jul 27 '15 at 11:53
An alternative solution with tcolorboxes and tcblistings can be found in http://tex.stackexchange.com/a/257455/1952 — Ignasi, Jul 28 '15 at 11:57

score 1 · Answer 1 · answered Jul 27 '15 at 10:53

If you are able to settle for verbatim code that is not syntax highlighted, and which does not require page breaking, you could place it in a verbatimbox prior to entering your newly defined solution environment.

Of course, by that point, it is in a box, and not available as text.

\documentclass[10pt]{book}
\usepackage{environ}
%\usepackage{listings}
\usepackage{verbatimbox}
\NewEnviron{solution}{\BODY}

\begin{document}

\begin{verbbox}
c My code
      i = 0
      do while(i .lt. 10)
        print *, i
        i = i + 1
      end do
      stop
\end{verbbox}
\begin{solution}
This is an environment containing code.

\theverbbox
\end{solution}


\end{document}

NewEnviron, \BODY and lstlisting

1 Answers1

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