stack.sty and \end{environment}

Question

I'm writing a multilevel itemize list environment to simplify the process of putting nested lists in Beamer slides, and I want it to support enumerate lists as well. The mitemize environment is supposed to work as follows:

\begin{mitemize}
  \enumeratelist
  \mitem{1} Candidate Generation
  \mitem{2} From annotated data
  \mitem{2} Using heuristics from unannotated data
  \mitem{1} Connect the slots to create trees
  \mitem{1} Pruning and Sorting
  \mitem{2} Covering algorithm on annotated corpus
  \mitem{2} Sorting linkage specifications by structure
\end{mitemize}

Which is supposed to look as follows:

I've gotten the package working with one problem: whenever mitemize.sty tries to close an enumerate or itemize list, the result is an error message:

\begin{itemize} on input line 104 ended by \end{itemize}.

or

\begin{enumerate} on input line 504 ended by \end{enumerate}.

Apparently \Push{stackname}{itemize}\end{\Stack{stackname}} isn't the same as \end{itemize}. Any ideas how to fix this:

\ProvidesPackage{mitemize}
\RequirePackage{stack}
\RequirePackage{ifthen}

\NewStack{mitemizeStack}{\empty}
\newcounter{mitemize@depth}

\newenvironment{mitemize}{
   \newcommand{\mitem}[1]{%
      \whiledo{\value{mitemize@depth}>##1}{%
     \end{\Stack{mitemizeStack}}%
     \Pop{mitemizeStack}%
     \addtocounter{mitemize@depth}{-1}%
      }%
      \whiledo{\value{mitemize@depth}<##1}{%
     \addtocounter{mitemize@depth}{1}%
     \Push{mitemizeStack}{itemize}
     \begin{itemize}%
      }%
      \item%
   }%
   \newcommand{\enumeratelist}{%
     \addtocounter{mitemize@depth}{1}%
     \Push{mitemizeStack}{enumerate}
     \begin{enumerate}%
   }%
}{
   \whiledo{\value{mitemize@depth}>0}{%
      \end{\Stack{mitemizeStack}}%
      \Pop{mitemizeStack}%
      \addtocounter{mitemize@depth}{-1}%
   }%
}

---

Here's a more minimal example to play with. The output is correct, but I get the error \begin{itemize} on input line 7 ended by \end{itemize}.

\documentclass{article}
\usepackage{stack}
\NewStack{endenvstack}{\empty}
\begin{document}

\Push{endenvstack}{itemize}
\begin{itemize}
\item Foo
\item Bar
\item Baz
\end{\Stack{endenvstack}}

Text that comes after the list

\end{document}

Answer 1

I got a working version by putting creating new commands to hide the \end{enumerate} and \end{itemize} and calling them using csname.

In my minimal example, this works out to:

\documentclass{article}
\usepackage{stack}

\newcommand{\wrapenditemize}{\end{itemize}}    %create a wrapper

\NewStack{endenvstack}{\empty}
\begin{document}

\Push{endenvstack}{wrapenditemize}             %the wrapper's name is pushed as normal text
\begin{itemize}
\item Foo
\item Bar
\item Baz
\csname\Stack{endenvstack}\endcsname           %the wrapper's name is popped as normal text
                                               %and then turned into a macro call
                                               %using \csname

Text that comes after the list

\end{document}