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MAN page from Fedora 20 perl-HTML-Parser-3.71-4.fc20.x86_64.rpm

HTML::Filter

Section: User Contributed Perl Documentation (3)
Updated: 2013-03-25
Index 

NAME

HTML::Filter - Filter HTML text through the parser 

NOTE

This module is deprecated. The "HTML::Parser" now provides thefunctionally 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 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}}) }
 

SEE ALSO

HTML::Parser 

COPYRIGHT

Copyright 1997-1999 Gisle Aas.

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


 

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NAME
NOTE
SYNOPSIS
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EXAMPLES
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