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From: guzman-juan@cs.yale.edu (Juan Carlos Guzman)
Newsgroups: comp.text.tex
Subject: LaTeX: How to include \end{document} in a macro?
Message-ID: <29996@cs.yale.edu>
Date: 12 Apr 91 15:39:12 GMT
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Organization: Yale University, Dept. of Computer Science, New Haven, CT
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Originator: guzman@monad.CS.Yale.Edu



Hi,

I have defined the environment `file', which should work essentially
like `document', except that I can have nested file environments, in
which case the nested ones behave as noop.

  \newenvironment{file}[1]
    {\ifnum\value{FileCounter}=0\begin{document}\fi
     \addtocounter{FileCounter}{1}}
    {\addtocounter{FileCounter}{-1}
     \ifnum\value{FileCounter}=0\end{document}\fi}

The environment works fine, but when it's time to close the
document, LaTeX complains:

   % latex myfile
   LaTeX error.  See LaTeX manual for explanation.
		 Type  H <return>  for immediate help.
   ! \begin{file} ended by \end{document}.
   ...
   l.123 \end{file}

   ?

After hitting <CR>, the file is closed with no problem, except that
\end{file} does not seem to have been closed properly (note
complaining about \ifnum not being complete):

   [3] (myfile.aux) )
   (\end occurred inside a group at level 1)
   (\end occurred when \ifnum on line 123 was incomplete)
   Output written on .dvi (3 pages, 7200 bytes).
   Transcript written on myfile.log.

From this I gather that when LaTeX processes \end{document}, it
immediately stops further processing of the input.  So my question is:
How can I do to `delay' LaTeX's processing of \end{document} until it
has completely expanded \end{file}?

On a related note, How should I change the macro so that when LaTeX
reaches a recursive \end{file} it ignores further input from this
file, and returns processing its parent?

Thanks a lot,

Juan Carlos Guzman
guzman-juan@cs.yale.edu
-- 
Juan in a million