RE: [htmltmpl] Trimming whitespace

[Paulsen, B. <BPa...@le...>]

One other advantage of doing this as a filter function.  Any updates to the
function can be done independently of Sam's release of H::T (provide that
it's in a separate package)

Brian

-----Original Message-----
From: Drew Taylor [mailto:dr...@dr...] 
Sent: Tuesday, February 11, 2003 4:08 PM
To: Paulsen, Brian
Cc: htm...@li...
Subject: RE: [htmltmpl] Trimming whitespace


I'm coming from the TT world, where this is just an option to new(). I get 
all kinds of useful options to make the results look prettier:

my %opts = (
   TRIM => 1,
   PRE_CHOMP => 1,
   POST_CHOMP => 1,
);
$tt = Template->new(%opts);

 From http://www.template-toolkit.org/docs/default/Manual/Config.html
>PRE_CHOMP, POST_CHOMP
>
>Anything outside a directive tag is considered plain text and is 
>generally
>passed through unaltered (but see the INTERPOLATE option). This includes 
>all whitespace and newlines characters surrounding directive tags. 
>Directives that don't generate any output will leave gaps in the output 
>document.

That's what I want - a simple config option. If this adds a filter behind 
the scenes I don't care. No, it doesn't matter much to the resulting HTML. 
But nicely formatted & spaced HTML makes it easier for me when there's a 
problem and I'm trying to find it. Yes, I create my H:T object in a 
centralized place and could easily add a filter, but that's not the point.
:-)

Drew

At 03:27 PM 2/11/03 -0500, Paulsen, Brian wrote:
>I'm still at a loss why a simple filter function couldn't do this work.
>
>Perhaps what we need is people to contribute filter functions to do 
>these kinds of things.
>
>Brian
>
>-----Original Message-----
>From: Jody Biggs [mailto:big...@ya...]
>Sent: Tuesday, February 11, 2003 3:19 PM
>To: simran; Jay 'Whip' Grizzard
>Cc: htm...@li...
>Subject: Re: [htmltmpl] Trimming whitespace
>
>
>hear hear!
>
>I've got some _extremely_ ugly templates that are outputting CSV or tab 
>delimited data, as they loop through data cells in each row, and have 
>several conditions within each row and cell...
>
>perhaps it would be reasonable to consider adding an option for 
>stripping white space out of lines which contain nothing but an 
>HTML::Template tag?
>
>  - j
>
>--- simran <sim...@le...> wrote:
> > On Tue, 2003-02-11 at 05:27, Jay 'Whip' Grizzard wrote:
> > > On Fri, Feb 07, 2003 at 12:54:59PM -0500, Sam Tregar wrote:
> > > > On Fri, 7 Feb 2003, Drew Taylor wrote:
> > > >
> > > > > Is there a way to trim the extra whitespace\newlines from the
> > final output?
> > > > > I didn't notice anything in the docs so I thought I'd ask 
> > > > > here.
> > > >
> > > > HTML::Clean works for some people.  In general I don't let it
> > bother me.
> > > > It's just a few extra bytes and the browser certainly doesn't
> > care.
> > >
> > > Problem is, sometimes the browser -does- care. There's not a
> > difference
> > > between "one character of whitespace" and "many characters of
> > whitespace", but
> > > there is a difference between those and "zero characters of
> > whitespace".
> >
> > Agree. Also, HTML::Template is i think used in quite a wide range of 
> > applications - and its not uncommon (at least at my workplace) to 
> > encounter this templating mechanism to produce output for other 
> > applications (eg, XML, CSV, TXT, ...) and sometimes those 
> > applications do care about the number of whitespaces.
> >
> > >
> > >
> > > Me personally, I use an HTML::Template::Extension module to do it.
> > Heck,
> > > said module even appears to be appended to this email. Usage: use
> > PACKTAGS
> > > as an extension, and close some of your tags with " #>" (note the
> > space)
> > > instead of >. Any tags closed that way will cut off output until
> > the next
> > > tag in the template. (This could be trivially adjusted to just
> > remove
> > > whitespace, as well .. adjust _pack_tags in the obvious way).
> > >
> > > Incidentally, this script solves one of the two complaints I've 
> > > had
> > about
> > > HTML::Template. The other complaint? There isn't a way to
> > incrementally
> > > render loops, since you have to give it the entire contents of the
> > loop at
> > > once. It seems silly to hold several thousand iterations of data 
> > > in
> > memory,
> > > when one could just output an iteration at a time...
> > >
> > > Anyhoo. Enjoy.
> > >
> > > -jay
> > >
> > >                            ----- CUT HERE -----
> > >
> > >
> > > package HTML::Template::Extension::PACKTAGS;
> > >
> > > $VERSION            = "0.01";
> > > sub Version         { $VERSION; }
> > >
> > > use Carp;
> > > use strict;
> > >
> > > my $classname;
> > > my $parentname;
> > >
> > >
> > > my %fields  =
> > > (
> > >  ecp_compatibility_mode => 0,
> > > );
> > >
> > >
> > > my @fields_req  = qw//;
> > >
> > >
> > > sub new
> > > {
> > >     $classname = shift;
> > >     my $self = shift;
> > >     $parentname = ref($self);
> > >     bless $self,$classname;
> > >
> > >     $self->_init_local(@_);
> > >     return $self;
> > > }
> > >
> > >
> > > sub _init_local {
> > >     my $self = shift;
> > >     my (%options) = @_;
> > >
> > >     # Assign default options
> > >     while (my ($key,$value) = each(%fields)) {
> > >         $self->{$key} = $self->{$key} || $value;
> > >     }
> > >
> > >     # Assign options
> > >     while (my ($key,$value) = each(%options)) {
> > >         $self->{$key} = $value
> > >     }
> > >
> > >     # Check required params
> > >     foreach (@fields_req) {
> > >         croak "You must declare '$_' in " . ref($self) . "::new"
> > >         if (!defined $self->{$_});
> > >     }
> > >
> > >     $self->push_filter();
> > > }
> > >
> > >
> > > sub push_filter {
> > >     my $self = shift;
> > >     bless($self, $classname);
> > >
> > >     push(@{$self->{filter}}, @{$self->_get_filter()});
> > >     bless($self, $parentname);
> > > }
> > >
> > >
> > > sub _get_filter {
> > >     my $self = shift;
> > >     my @ret ;
> > >
> > >     # Sorry for this :->. I've an e-commerce project called ecp
> > that
> > >     # use a CSTART modified syntax using html comment
> > >     push @ret,\&_pack_tags if ($self->{ecp_compatibility_mode});
> > >
> > >     # Standard CSTART syntax
> > >     push @ret,\&_pack_tags;
> > >
> > >     return \@ret;
> > > }
> > >
> > >
> > > sub _pack_tags {
> > >     my $template = shift;
> > >
> > > #    $template = $$template;
> > > #    print STDERR $template;
> > >
> > >     $$template =~ s/\s+#>[^<]*</></g;
> > >
> > >     return $template;
> > > }
> > >
> > > 1;
> > >
> > >
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--
Drew Taylor                | Web development & consulting
http://www.drewtaylor.com/ | perl/mod_perl/DBI/mysql/postgres
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