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lib::HTML::Filter

Section: User Contributed Perl Documentation (3)
Updated: perl 5.005, patch 03
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NAME

HTML::Filter - Filter HTML text through the parser

NOTE

This module is deprecated. HTML::Parser now provides thefunctionally of HTML::Filter much more efficiently with the thedefault handler.

SYNOPSIS

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

DESCRIPTION

HTML::Filter is an HTML parser that by default prints theoriginal text of each HTML element (a slow version of cat(1) basically).The callback methods may be overridden to modify the filtering for someHTML elements and you can override output() method which is called toprint the HTML text.

HTML::Filter is a subclass of HTML::Parser. This means thatthe 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 anHTML file. This is achieved by simply overriding the comment methodto 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>sfound in the HTML file. We specialize the start() and end() methodsto count table tags and then make output not happen when inside atable.

  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 dosomething like this:

  package FilterIntoString;  require HTML::Filter;  @ISA=qw(HTML::Filter);  sub output { push(@{$_[0]->{fhtml}}, $_[1]) }  sub filtered_html { join("", @{$_[0]->{fhtml}}) }

COPYRIGHT

This library is free software; you can redistribute it and/ormodify it under the same terms as Perl itself.

This document was created byman2html,using the manual pages.