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/lzjheA "&Tţ i7_ub &=LV[(package HTML::LinkExtor; require HTML::Parser; @ISA = qw(HTML::Parser); $VERSION = "3.69"; =head1 NAME HTML::LinkExtor - Extract links from an HTML document =head1 SYNOPSIS require HTML::LinkExtor; $p = HTML::LinkExtor->new(\&cb, "http://www.perl.org/"); sub cb { my($tag, %links) = @_; print "$tag @{[%links]}\n"; } $p->parse_file("index.html"); =head1 DESCRIPTION I is an HTML parser that extracts links from an HTML document. The I is a subclass of I. This means that the document should be given to the parser by calling the $p->parse() or $p->parse_file() methods. =cut use strict; use HTML::Tagset (); # legacy (some applications grabs this hash directly) use vars qw(%LINK_ELEMENT); *LINK_ELEMENT = \%HTML::Tagset::linkElements; =over 4 =item $p = HTML::LinkExtor->new =item $p = HTML::LinkExtor->new( $callback ) =item $p = HTML::LinkExtor->new( $callback, $base ) The constructor takes two optional arguments. The first is a reference to a callback routine. It will be called as links are found. If a callback is not provided, then links are just accumulated internally and can be retrieved by calling the $p->links() method. The $base argument is an optional base URL used to absolutize all URLs found. You need to have the I module installed if you provide $base. The callback is called with the lowercase tag name as first argument, and then all link attributes as separate key/value pairs. All non-link attributes are removed. =cut sub new { my($class, $cb, $base) = @_; my $self = $class->SUPER::new( start_h => ["_start_tag", "self,tagname,attr"], report_tags => [keys %HTML::Tagset::linkElements], ); $self->{extractlink_cb} = $cb; if ($base) { require URI; $self->{extractlink_base} = URI->new($base); } $self; } sub _start_tag { my($self, $tag, $attr) = @_; my $base = $self->{extractlink_base}; my $links = $HTML::Tagset::linkElements{$tag}; $links = [$links] unless ref $links; my @links; my $a; for $a (@$links) { next unless exists $attr->{$a}; (my $link = $attr->{$a}) =~ s/^\s+//; $link =~ s/\s+$//; # HTML5 push(@links, $a, $base ? URI->new($link, $base)->abs($base) : $link); } return unless @links; $self->_found_link($tag, @links); } sub _found_link { my $self = shift; my $cb = $self->{extractlink_cb}; if ($cb) { &$cb(@_); } else { push(@{$self->{'links'}}, [@_]); } } =item $p->links Returns a list of all links found in the document. The returned values will be anonymous arrays with the following elements: [$tag, $attr => $url1, $attr2 => $url2,...] The $p->links method will also truncate the internal link list. This means that if the method is called twice without any parsing between them the second call will return an empty list. Also note that $p->links will always be empty if a callback routine was provided when the I was created. =cut sub links { my $self = shift; exists($self->{'links'}) ? @{delete $self->{'links'}} : (); } # We override the parse_file() method so that we can clear the links # before we start a new file. sub parse_file { my $self = shift; delete $self->{'links'}; $self->SUPER::parse_file(@_); } =back =head1 EXAMPLE This is an example showing how you can extract links from a document received using LWP: use LWP::UserAgent; use HTML::LinkExtor; use URI::URL; $url = "http://www.perl.org/"; # for instance $ua = LWP::UserAgent->new; # Set up a callb