/IronPython_Main/Runtime/Tests/LinqDlrTests/testenv/perl/site/lib/html/Filter.pm

package HTML::Filter;



require HTML::Parser;

@ISA=qw(HTML::Parser);



$VERSION = sprintf("%d.%02d", q$Revision: 2.9 $ =~ /(\d+)\.(\d+)/);



sub declaration { $_[0]->output("<!$_[1]>")     }

sub process     { $_[0]->output($_[2])          }

sub comment     { $_[0]->output("<!--$_[1]-->") }

sub start       { $_[0]->output($_[4])          }

sub end         { $_[0]->output($_[2])          }

sub text        { $_[0]->output($_[1])          }



sub output      { print $_[1] }



1;



__END__



=head1 NAME



HTML::Filter - Filter HTML text through the parser



=head1 NOTE



This module is deprecated. C<HTML::Parser> now provides the

functionally of C<HTML::Filter> much more efficiently with the the

C<default> handler.



=head1 SYNOPSIS



 require HTML::Filter;

 $p = HTML::Filter->new->parse_file("index.html");



=head1 DESCRIPTION



C<HTML::Filter> is an HTML parser that by default prints the

original text of each HTML element (a slow version of cat(1) basically).

The callback methods may be overridden to modify the filtering for some

HTML elements and you can override output() method which is called to

print the HTML text.



C<HTML::Filter> is a subclass of C<HTML::Parser>. This means that

the document should be given to the parser by calling the $p->parse()

or $p->parse_file() methods.



=head1 EXAMPLES



The first example is a filter that will remove all comments from an

HTML file.  This is achieved by simply overriding the comment method

to do nothing.



  package CommentStripper;

  require HTML::Filter;

  @ISA=qw(HTML::Filter);

  sub comment { }  # ignore comments



The second example shows a filter that will remove any E<lt>TABLE>s

found in the HTML file.  We specialize the start() and end() methods

to count table tags and then make output not happen when inside a

table.



  package TableStripper;

  require HTML::Filter;

  @ISA=qw(HTML::Filter);

  sub start

  {

     my $self = shift;

     $self->{table_seen}++ if $_[0] eq "table";

     $self->SUPER::start(@_);

  }



  sub end

  {

     my $self = shift;

     $self->SUPER::end(@_);

     $self->{table_seen}-- if $_[0] eq "table";

  }



  sub output

  {

      my $self = shift;

      unless ($self->{table_seen}) {

	  $self->SUPER::output(@_);

      }

  }



If you want to collect the parsed text internally you might want to do

something like this:



  package FilterIntoString;

  require HTML::Filter;

  @ISA=qw(HTML::Filter);

  sub output { push(@{$_[0]->{fhtml}}, $_[1]) }

  sub filtered_html { join("", @{$_[0]->{fhtml}}) }



=head1 SEE ALSO



L<HTML::Parser>



=head1 COPYRIGHT



Copyright 1997-1999 Gisle Aas.



This library is free software; you can redistribute it and/or

modify it under the same terms as Perl itself.



=cut