/ 
HTML-Element-Replacer-0.06
River stage one • 1 direct dependent • 2 total dependents
/ HTML::Element::Replacer

NAME

HTML::Element::Replacer - simplify the HTML::Element clone() - push_content() ritual

SYNOPSIS

 use HTML::Element::Replacer;

 {
  my $replacer = HTML::Element::Replacer->new(tree => $tree, look_down => [ scla => 'mid' ]);

  for my $data (@data) {
    $replacer->push_clone->defmap(attr_name => $data); # clone and push onto @temp_list
  }
 }
 # by default Replacer replaces... so it removes the element you were push_clone()ing

DESCRIPTION

Let's say you have this HTML:

<table>

  <tr scla="top"/> 

  <tr scla="mid"> 
    <td kmap="brand"> blah </td>
    <td kmap="age"> blah </td>
  </tr>

  <tr scla="bot"/> 

</table>

Now let's say you have 5 data rows that you wish to display using the middle tr as your sample. The pure HTML::Tree way to do this would be:

my $sample_tr = $tree->look_down(scla => 'mid');

my @c;
for my $data (@data) {
   my $c = $sample_tr->clone; 
   $c->defmap(kmap => $data);
   push @c, $c;
}

$sample->replace_with(@c);

We did cheat a bit by using defmap() from HTML::Element::Library. Now, with this class, we can do this:

 { 	
    my $replacer = HTML::Element::Replacer->new(look_down => [ scla => 'mid' ]);
 
    for my $data (@data) {
	my $clone = $replacer->push_clone->defmap(kmap => $data); # clone and push onto @temp_list
    }

 } # replacer goes out of scope and then replaces sample_tr

AUTHOR

Terrence Brannon, <tbone at cpan.org>

Many thanks to Dave Rolsky in #moose on irc.perl.org

[16:04] @autarch: metaperl: I'm not sure you understand what "going out of scope" means
[16:05] @autarch: { my $x = { foo => 1 }; my $y = { x => $x }; }
[16:05] @autarch: both $x & $y go out of scope at the end of the block
[16:05] @autarch: my $x = { foo => 1 };{  my $y = { x => $x }; }
[16:05] @autarch: $y goes out of scope at the end of the block, $x persists
[16:06] @autarch: my $x = { foo => 1 };{  my $y = {}; $x->{y} = $y }
[16:06] @autarch: $y does not go out of scope until $x does
[16:06] @autarch: the only thing that matters is references _to_ the thing in question, not references it holds
[16:07] metaperl: ok that answers my question perfectly.... it doesnt matter if the hashref points to something that will remain 'alive' due to being defined in larger scope. thank you. now if $y were blessed into a class, when it goes out of scope... Classname::DESTROY($self) would be called .... where $self is $y in this case?
[16:08] metaperl: because manually calling $object->finish is not elegant
[16:08] metaperl: I want to handle that in a destructor method

SOURCE

http://github.com/metaperl/html-element-replacer

BUGS

Please report any bugs or feature requests to bug-html-element-replacer at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=HTML-Element-Replacer. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc HTML::Element::Replacer

You can also look for information at:

ACKNOWLEDGEMENTS

COPYRIGHT & LICENSE

Copyright 2009 Terrence Brannon, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.