Approach the problem from a slightly different tack. Don't try to do
everything in one pass through H::T.
Instead, think of it as a two-step approach.
Each user belongs to a group, and the group portions of the template are the
same for all members of that group.
Only the user portions need to change with each visit. So, separate the
group variables from the user variables.
In this type situation, I do a one-time "page generation" of the "group"
template to be used for subsequent user visits.
That user template is generated from a "master template" where all the
"group" level elements (like logo image, background and text colors, etc.)
are normal TMPL_VAR's to be handled during this page gen step. Portions that
pertain to user-specific variables are "renamed" (or purposely misnamed, if
you will) TMPL_VAR's so they are not recognized and handled by H::T during
this pass. So, the user's first name, which should be "ignored" during the
page gen might be in a "tag" named like -
<my_special_VAR NAME=first>
In my page gen code I take the output H::T and rename the dummy VAR names to
"proper" H::T TMPL_VAR's before writing out the user version of the
template. Assuming you've got an H::T object, $template, and previously
opened FileHandle, $fh, the code would look something like this -
my $output = $template->output;
## Replace temporary tags with HTML::Temlate tags before write to file
#
$output =~ s/my_special_VAR/TMPL_VAR/g;
print $fh $output;
The template output in the output file pointed to by $fh is then your "user"
version of the template.
All the "group-level" elements have already been replaced with the
hard-coded equivalents.
Makes for a much faster end-user experience since there are less tags to
process at that level.
Steve Ragan
Sr. Internet Developer
Harris Internet Services
2500 Westchester Ave.
Purchase, NY 10577
Phone: 914-641-3948
Fax : 914-641-3901
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
Mark Fuller
Sent: Tuesday, January 18, 2005 12:26 PM
To: HTML::Template users
Subject: [htmltmpl] RFC: Persistent or 2-stage evaluation
Sam, earlier I said it would be useful if I could apply some evaluation
once. Then operate upon that partially evaluated template. I didn't realize
H::T applies everything at output(?).
If H::T applies everything at output, wouldn't it be relatively easy to
accomplish this if there was a way to tell H::T to perform an "output" *but
don't eliminate any H::T tags that are unevaluated*?
If I could do this, I could set all my one-time page evaluation and do a
"new_scalar_ref->" (using the output from my first "new->" from a file). If
there were a way to tell H::T to reload it internally there may be a way to
utilize H::T's caching mechanism (instead of me keeping my H::T object in
%hash_of_templates{language}). Doing a "new->" would have to tell me it
reloaded the template so that I could do the one-time processing again (and
output_internal-> to put it back into the state where it's mostely prepared
for repeated processing).
What do you think? Would it be easy to do by sub-classing?
Did you eventually agree there is a legitimate case for one-time page
evaluation? (One-time language replacement of title, headings, navigation,
etc.) I'd like to apply some heavy replacement and do it only once. Keep the
resulting text containing only the tags that are evaluated on a
display-by-display basis (messages, etc.).
This might have some application for select/option lists too. I won't
confuse the issue with that yet. My main concern is just to avoid repetitive
numerous replacement of text which is constant for a page.
Thanks!
Mark
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