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From: duchier@cs.yale.edu (Denys Duchier)
Newsgroups: comp.text.tex
Subject: Re: Using \iffalse inside a LaTeX environment definition.
Message-ID: <DUCHIER.90Jul27105456@albania.cs.yale.edu>
Date: 27 Jul 90 14:54:56 GMT
References: <811@qusuntrd.queensu.CA>
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In-reply-to: erskine@qucis.queensu.CA's message of 27 Jul 90 02:17:43 GMT

In article <811@qusuntrd.queensu.CA> erskine@qucis.queensu.CA (Neil Erskine) writes:
 >	   I have a large number of files written using LaTeX and some
 >   additional macros I wrote.  I sometimes want to suppress certain
 >   parts of them, so I thought to do this by placing some parts in null
 >   environments, as in
 >
 >   \newenvironment{Comments}{}{}
 >   ...
 >   \begin{Comments}
 >   Stuff that is sometimes suppressed.
 >   \end{Comments}
 >
 >   I now want to suppress the comments, so I tried
 >
 >   \newenvironment{Comments}{\iffalse}{\fi}
 >[...]

Here comes this question again! :-)

The following ought to do what you want.

{\catcode`\{= 12 \catcode`\}= 12 \catcode`\@=11 
 \catcode`\[=1 \catcode`]=2 
 \catcode`\|=0 \catcode`\\=12 
 |global|long|def|@Comments#1\end{Comments}[|end[Comments]]
 |global|def|Comments[|let|do|@makeother|dospecials|@Comments]]


--Denys