HTML::Filter(3) User Contributed Perl Documentation HTML::Filter(3)

NAME
       HTML::Filter - Filter HTML text through the parser

NNOOTTEE
       TThhiiss mmoodduullee iiss ddeepprreeccaatteedd.. The "HTML::Parser" now provides the
       functionally of "HTML::Filter" much more efficiently with the the
       "default" handler.

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

DESCRIPTION
       "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.

       "HTML::Filter" is a subclass of "HTML::Parser". This means that the
       document should be given to the parser by calling the $p->parse() or
       $p->parsefile() methods.

EEXXAAMMPPLLEESS
       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 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->{tableseen}++ if $[0] eq "table";
            $self->SUPER::start(@);
         }

         sub end
         {
            my $self = shift;
            $self->SUPER::end(@);
            $self->{tableseen}- if $[0] eq "table";
         }

         sub output
         {
             my $self = shift;
             unless ($self->{tableseen}) {
                 $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}}, $[1]) }
         sub filteredhtml { join("", @{$[0]->{fhtml}}) }
SEE ALSO
       HTML::Parser

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.



perl v5.8.8                       2005-09-12                   HTML::Filter(3)





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