html::filter(3)
NAME
HTML::Filter - Filter HTML text through the parser
NOTE
This module is deprecated. "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->parse_file("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->parse_file() methods.
EXAMPLES
- The first example is a filter that will remove all com
ments from an HTML file. This is achieved by simply over
riding 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
<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}}) }
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.