On Tue, 24 Nov 2009 21:24:30 -0500, Brad Baxter wrote
> Hi all,
>
> I once tried to implement nested templates with HTML::Template.
> Below is an example of what I came up with:
>
> 1 #!/usr/local/bin/perl
> 2
> 3 use strict;
> 4 use warnings;
> 5 use HTML::Template;
> 6
> 7 my $text = <<__;
> 8 This is a <TMPL_VAR NAME="color"> bird.
> 9 This is a <TMPL_VAR NAME="<TMPL_VAR NAME="color">"> bird.
> 10 This is a <TMPL_VAR NAME="<TMPL_VAR NAME="<TMPL_VAR
> NAME="color">">"> bird.
> 11 __
> 12
> 13 my $output = '';
> 14 my $sref = \$text;
> 15 my $count;
> 16
> 17 while (1) {
> 18 $count++;
> 19
> 20 my $tmpl = HTML::Template->new(
> 21 scalarref => $sref,
> 22 strict => 0,
> 23 die_on_bad_params => 0,
> 24 case_sensitive => 1,
> 25 );
> 26
> 27 $tmpl->param( color => 'blue' );
> 28 $tmpl->param( blue => 'BLUE' );
> 29 $tmpl->param( BLUE => '**BLUE**' );
> 30
> 31 $text = $tmpl->output();
> 32
> 33 print "\n$count:\n$text"; # debug
> 34
> 35 last if $output eq $text; # no changes since last time
> 36 $output = $text;
> 37
> 38 }
> 39
> 40 print "\nfinal: \n$output";
> 41
> 42 __END__
>
> 1:
> This is a blue bird.
> This is a <TMPL_VAR NAME="blue"> bird.
> This is a <TMPL_VAR NAME="<TMPL_VAR NAME="blue">"> bird.
>
> 2:
> This is a blue bird.
> This is a BLUE bird.
> This is a <TMPL_VAR NAME="BLUE"> bird.
>
> 3:
> This is a blue bird.
> This is a BLUE bird.
> This is a **BLUE** bird.
>
> 4:
> This is a blue bird.
> This is a BLUE bird.
> This is a **BLUE** bird.
>
> final:
> This is a blue bird.
> This is a BLUE bird.
> This is a **BLUE** bird.
>
> I would like a better way of doing this. The calls to
> new() on line 20, the copies on lines 31 and 36, and
> the compares on line 36 just seem all a bit much for
> what ought (I think) to be more like
>
> 1 while s/from/to/g;
>
> Is there a better way?
I would just do:
#!/usr/local/bin/perl
use strict;
use warnings;
use HTML::Template;
my $template = qq|
This is a <tmpl_var color> bird.
This is a <tmpl_if is_blue>BLUE</tmpl_if> bird.
This is a <tmpl_if is_blue>**BLUE**</tmpl_if> bird.
|;
# all the logic of what the color will be goes here
my $color = 'blue';
my $tmpl = HTML::Template->new(
scalarref => \$template,
strict => 0,
die_on_bad_params => 0,
case_sensitive => 1,
);
$tmpl->param(
color => $color,
is_blue => $color eq 'blue' ? 1 : 0,
);
print $tmpl->output();
So many advantages. The logic is completely separate from the presentation. If
you send the template
to a speaker of a different language, they can localize that with no problems.
The code is much
shorter at 29 lines vs. 42 lines, and its much more clear to a future
maintainer what is happening
without any brain gymnastics.
HTH,
Alex
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