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Member "install-tl-20200916/tlpkg/tlperl/site/lib/HTML/Filter.pm" (5 Apr 2016, 2681 Bytes) of package /windows/misc/install-tl.zip:


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    1 package HTML::Filter;
    2 
    3 use strict;
    4 use vars qw(@ISA $VERSION);
    5 
    6 require HTML::Parser;
    7 @ISA=qw(HTML::Parser);
    8 
    9 $VERSION = "3.72";
   10 
   11 sub declaration { $_[0]->output("<!$_[1]>")     }
   12 sub process     { $_[0]->output($_[2])          }
   13 sub comment     { $_[0]->output("<!--$_[1]-->") }
   14 sub start       { $_[0]->output($_[4])          }
   15 sub end         { $_[0]->output($_[2])          }
   16 sub text        { $_[0]->output($_[1])          }
   17 
   18 sub output      { print $_[1] }
   19 
   20 1;
   21 
   22 __END__
   23 
   24 =head1 NAME
   25 
   26 HTML::Filter - Filter HTML text through the parser
   27 
   28 =head1 NOTE
   29 
   30 B<This module is deprecated.> The C<HTML::Parser> now provides the
   31 functionally of C<HTML::Filter> much more efficiently with the
   32 C<default> handler.
   33 
   34 =head1 SYNOPSIS
   35 
   36  require HTML::Filter;
   37  $p = HTML::Filter->new->parse_file("index.html");
   38 
   39 =head1 DESCRIPTION
   40 
   41 C<HTML::Filter> is an HTML parser that by default prints the
   42 original text of each HTML element (a slow version of cat(1) basically).
   43 The callback methods may be overridden to modify the filtering for some
   44 HTML elements and you can override output() method which is called to
   45 print the HTML text.
   46 
   47 C<HTML::Filter> is a subclass of C<HTML::Parser>. This means that
   48 the document should be given to the parser by calling the $p->parse()
   49 or $p->parse_file() methods.
   50 
   51 =head1 EXAMPLES
   52 
   53 The first example is a filter that will remove all comments from an
   54 HTML file.  This is achieved by simply overriding the comment method
   55 to do nothing.
   56 
   57   package CommentStripper;
   58   require HTML::Filter;
   59   @ISA=qw(HTML::Filter);
   60   sub comment { }  # ignore comments
   61 
   62 The second example shows a filter that will remove any E<lt>TABLE>s
   63 found in the HTML file.  We specialize the start() and end() methods
   64 to count table tags and then make output not happen when inside a
   65 table.
   66 
   67   package TableStripper;
   68   require HTML::Filter;
   69   @ISA=qw(HTML::Filter);
   70   sub start
   71   {
   72      my $self = shift;
   73      $self->{table_seen}++ if $_[0] eq "table";
   74      $self->SUPER::start(@_);
   75   }
   76 
   77   sub end
   78   {
   79      my $self = shift;
   80      $self->SUPER::end(@_);
   81      $self->{table_seen}-- if $_[0] eq "table";
   82   }
   83 
   84   sub output
   85   {
   86       my $self = shift;
   87       unless ($self->{table_seen}) {
   88       $self->SUPER::output(@_);
   89       }
   90   }
   91 
   92 If you want to collect the parsed text internally you might want to do
   93 something like this:
   94 
   95   package FilterIntoString;
   96   require HTML::Filter;
   97   @ISA=qw(HTML::Filter);
   98   sub output { push(@{$_[0]->{fhtml}}, $_[1]) }
   99   sub filtered_html { join("", @{$_[0]->{fhtml}}) }
  100 
  101 =head1 SEE ALSO
  102 
  103 L<HTML::Parser>
  104 
  105 =head1 COPYRIGHT
  106 
  107 Copyright 1997-1999 Gisle Aas.
  108 
  109 This library is free software; you can redistribute it and/or
  110 modify it under the same terms as Perl itself.
  111 
  112 =cut