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From: Taco Hoekwater <taco@elvenkind.com>
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Subject: Re: xml comments
Date: Tue, 27 Nov 2001 09:37:41 +0100
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"Hans Hagen" <pragma@wxs.nl> wrote:
> At 03:20 PM 11/26/2001 +0100, Patrick Gundlach wrote:
> >Hi,
> >
> >xml comments have a bug (!?): spaces are critical at the
> >beginning of a comment.
> 
> you may try (and play with):
> 
> \long\def\xparseXMLescape !#1#2#3{\parseXMLescape{#1#2}#3}

Adding #3 is safe, sort of. <! is always followed by one of the language's
keywords, and <!-- is by far the shortest of those. Just watch out
that <!----> is a valid comment (although very unlikely to appear).

The string "<!-- crap -->" is actually a comment that starts with
a space. The comment itself in this case is: " crap ".

It is possible to take advantage of the fact that '<!--' is the only
keyword that starts with the same character twice, so the 'best' thing 
to do is something along these lines:

\long\def\xparseXMLescape!#1#2%
  {\if#1#2%
     \@EA\handleXMLcomment
    \else
     \@EA\doxparseXMLescape
    \fi#1#2}

\def\handleXMLcomment--#1-->{}

\def\doxparseXMLescape#1 {\parseXMLescape{#1}}

-- 
groeten,

Taco