NAME
HTML::Filter - Filter HTML text through the parser
NOTE
This module is deprecated. The "HTML::Parser" now provides the
functionally of "HTML::Filter" much more efficiently with 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 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 <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.
