Ross Moore writes:
> Yes, you can do this -- at least in principle.
> I'm not sure how well it actually works.
> A similar thing is needed occasionally with \color-macros.
>
> It works this way.
>
>
> Whenever a call is made to do_cmd_<whatever>
> there are 2 arguments passed:
> 1. the current string being processed
> 2. a list of open tags: @open_tags
>
> For most macros, onthe string is required, to be able to extract
> the arguments to the LaTeX command.
> This is done by: local($_) = @_;
> which stats the code block in most cases.
>
> However you could easily start the block with:
> local ($_, @open_tags) = @_;
Ross,
After digging around with this a bit, and consulting our local Perl
guru, I've come up with:
sub do_cmd_var{
local($_, $open_tags) = @_;
print "do_cmd_var(); \@open_tags = ("
. join(',', @open_tags)
. ")\n";
return ...;
}
always prints an empty list for @open_tags. Greg's comment (he's our
Perl guy) was that a lot of the code that dealt with @open_tags in
latex2html was using the Perl 4 approach, making it more complicated.
His explanation of what we had to do to figure this out was that the
second parameter to do_cmd_var() is a symbol table reference, and
should be unpacked using $open_tags but accessed using the
appropriate @open_tags syntax.
Why the list is empty I don't know; should my code be doing anything
to update @open_tags ? I'm not at all sure that that even makes
sense. Does latex2html pull out HTML tags from the stream in the main
loop to update the list? If I write:
sub next_argument{
# extract and return text of next { } group
my $param;
$param = missing_braces()
unless ((s/$next_pair_pr_rx/$param=$2;''/eo)
||(s/$next_pair_rx/$param=$2;''/eo));
return $param;
}
sub do_cmd_code{
local($_) = @_;
my $param = next_argument();
return "<code>$param</code>$_";
}
how would I modify do_cmd_code() to properly update @open_tags so
that do_cmd_var() could detect the already-opened <code> element?
Thanks for the prompt reply!
-Fred
--
Fred L. Drake, Jr.
[EMAIL PROTECTED]
Corporation for National Research Initiatives
1895 Preston White Drive Reston, VA 20191
