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HTML::LinkExtractor.3pm
Langue: en
Version: 2005-01-06 (mandriva - 01/05/08)
Section: 3 (Bibliothèques de fonctions)
NAME
HTML::LinkExtractor - Extract links from an HTML documentDESCRIPTION
HTML::LinkExtractor is used for extracting links from HTML. It is very similar to HTML::LinkExtor, except that besides getting the URL, you also get the link-text.Example ( please run the examples ):
use HTML::LinkExtractor; use Data::Dumper;
my $input = q{If <a href="http://perl.com/"> I am a LINK!!! </a>}; my $LX = new HTML::LinkExtractor();
$LX->parse(\$input);
print Dumper($LX->links); __END__ # the above example will yield $VAR1 = [ { '_TEXT' => '<a href="http://perl.com/"> I am a LINK!!! </a>', 'href' => bless(do{\(my $o = 'http://perl.com/')}, 'URI::http'), 'tag' => 'a' } ];
"HTML::LinkExtractor" will also correctly extract nested link-type tags.
SYNOPSIS
## the demo perl LinkExtractor.pm perl LinkExtractor.pm file.html othefile.html
## or if the module is installed, but you don't know where
perl -MHTML::LinkExtractor -e" system $^X, $INC{q{HTML/LinkExtractor.pm}} " perl -MHTML::LinkExtractor -e' system $^X, $INC{q{HTML/LinkExtractor.pm}} '
## or
use HTML::LinkExtractor; use LWP qw( get ); # use LWP::Simple qw( get );
my $base = 'http://search.cpan.org'; my $html = get($base.'/recent'); my $LX = new HTML::LinkExtractor();
$LX->parse(\$html);
print qq{<base href="$base">\n};
for my $Link( @{ $LX->links } ) { ## new modules are linked by /author/NAME/Dist if( $$Link{href}=~ m{^\/author\/\w+} ) { print $$Link{_TEXT}."\n"; } }
undef $LX; __END__
## or
use HTML::LinkExtractor; use Data::Dumper;
my $input = q{If <a href="http://perl.com/"> I am a LINK!!! </a>}; my $LX = new HTML::LinkExtractor( sub { print Data::Dumper::Dumper(@_); }, 'http://perlFox.org/', );
$LX->parse(\$input); $LX->strip(1); $LX->parse(\$input); __END__
#### Calculate to total size of a web-page #### adds up the sizes of all the images and stylesheets and stuff
use strict; use LWP; # use LWP::Simple; use HTML::LinkExtractor; # my $url = shift || 'http://www.google.com'; my $html = get($url); my $Total = length $html; # print "initial size $Total\n"; # my $LX = new HTML::LinkExtractor( sub { my( $X, $tag ) = @_; # unless( grep {$_ eq $tag->{tag} } @HTML::LinkExtractor::TAGS_IN_NEED ) { # print "$$tag{tag}\n"; # for my $urlAttr ( @{$HTML::LinkExtractor::TAGS{$$tag{tag}}} ) { if( exists $$tag{$urlAttr} ) { my $size = (head( $$tag{$urlAttr} ))[1]; $Total += $size if $size; print "adding $size\n" if $size; } } } }, $url, 0 ); # $LX->parse(\$html); # print "The total size of \n$url\n is $Total bytes\n"; __END__
METHODS
"$LX->new([\&callback, [$baseUrl, [1]]])"
$LX->new([\&callback, [$baseUrl, [1]]])
Accepts 3 arguments, all of which are optional. If for example you want to pass a $baseUrl, but don't want to have a callback invoked, just put "undef" in place of a subref.
This is the only class method.
- 1
- a callback ( a sub reference, as in "sub{}", or "\&sub") which is to be called each time a new LINK is encountered ( for @HTML::LinkExtractor::TAGS_IN_NEED this means
after the closing tag is encountered )The callback receives an object reference($LX) and a link hashref.
- 2
- and a base URL ( URI->new, so its up to you to make sure it's valid which is used to convert all relative URI's to absolute ones.
$ALinkP{href} = URI->new_abs( $ALink{href}, $base );
- 3
- A ``boolean'' (just stick with 1). See the example in ``DESCRIPTION''. Normally, you'd get back _TEXT that looks like
'_TEXT' => '<a href="http://perl.com/"> I am a LINK!!! </a>',
If you turn this option on, you'll get the following instead
'_TEXT' => ' I am a LINK!!! ',
The private utility function "_stripHTML" does this by using HTML::TokeParsers method get_trimmed_text.
You can turn this feature on an off by using "$LX->strip(undef || 0 || 1)"
"$LX->parse( $filename || *FILEHANDLE || \$FileContent )"
$LX->parse( $filename || *FILEHANDLE || \$FileContent )
Each time you call "parse", you should pass it a $filename a *FILEHANDLE or a "\$FileContent"
Each time you call "parse" a new "HTML::TokeParser" object is created and stored in "$this->{_tp}".
You shouldn't need to mess with the TokeParser object.
"$LX->links()"
$LX->links()
Only after you call "parse" will this method return anything. This method returns a reference to an ArrayOfHashes, which basically looks like (Data::Dumper output)
$VAR1 = [ { tag => 'img', src => 'image.png' }, ];
Please note that if yo provide a callback this array will be empty.
"$LX->strip( [ 0 || 1 ])"
$LX->strip( [ 0 || 1 ])
If you pass in "undef" (or nothing), returns the state of the option. Passing in a true or false value sets the option.
If you wanna know what the option does see "$LX->new([\&callback, [$baseUrl, [1]]])"
WHAT'S A LINK-type tag
Take a look at %HTML::LinkExtractor::TAGS to see what I consider to be link-type-tag.Take a look at @HTML::LinkExtractor::VALID_URL_ATTRIBUTES to see all the possible tag attributes which can contain URI's (the links!!)
Take a look at @HTML::LinkExtractor::TAGS_IN_NEED to see the tags for which the '_TEXT' attribute is provided, like "<a href="#"> TEST </a>"
How can that be?!?!
I took at look at %HTML::Tagset::linkElements and the following URL's
http://www.blooberry.com/indexdot/html/tagindex/all.htm
http://www.blooberry.com/indexdot/html/tagpages/a/a-hyperlink.htm http://www.blooberry.com/indexdot/html/tagpages/a/applet.htm http://www.blooberry.com/indexdot/html/tagpages/a/area.htm
http://www.blooberry.com/indexdot/html/tagpages/b/base.htm http://www.blooberry.com/indexdot/html/tagpages/b/bgsound.htm
http://www.blooberry.com/indexdot/html/tagpages/d/del.htm http://www.blooberry.com/indexdot/html/tagpages/d/div.htm
http://www.blooberry.com/indexdot/html/tagpages/e/embed.htm http://www.blooberry.com/indexdot/html/tagpages/f/frame.htm
http://www.blooberry.com/indexdot/html/tagpages/i/ins.htm http://www.blooberry.com/indexdot/html/tagpages/i/image.htm http://www.blooberry.com/indexdot/html/tagpages/i/iframe.htm http://www.blooberry.com/indexdot/html/tagpages/i/ilayer.htm http://www.blooberry.com/indexdot/html/tagpages/i/inputimage.htm
http://www.blooberry.com/indexdot/html/tagpages/l/layer.htm http://www.blooberry.com/indexdot/html/tagpages/l/link.htm
http://www.blooberry.com/indexdot/html/tagpages/o/object.htm
http://www.blooberry.com/indexdot/html/tagpages/q/q.htm
http://www.blooberry.com/indexdot/html/tagpages/s/script.htm http://www.blooberry.com/indexdot/html/tagpages/s/sound.htm
And the special cases
<!DOCTYPE HTML SYSTEM "http://www.w3.org/DTD/HTML4-strict.dtd"> http://www.blooberry.com/indexdot/html/tagpages/d/doctype.htm '!doctype' is really a process instruction, but is still listed in %TAGS with 'url' as the attribute
and
<meta HTTP-EQUIV="Refresh" CONTENT="5; URL=http://www.foo.com/foo.html"> http://www.blooberry.com/indexdot/html/tagpages/m/meta.htm If there is a valid url, 'url' is set as the attribute. The meta tag has no 'attributes' listed in %TAGS.
SEE ALSO
HTML::LinkExtor, HTML::TokeParser, HTML::Tagset.AUTHOR
D.H (PodMaster)Please use http://rt.cpan.org/ to report bugs.
Just go to http://rt.cpan.org/NoAuth/Bugs.html?Dist=HTML-Scrubber to see a bug list and/or repot new ones.
LICENSE
Copyright (c) 2003, 2004 by D.H. (PodMaster). All rights reserved.This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The LICENSE file contains the full text of the license.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre