html::treebuilder::libxml(3pm) [debian man page]

HTML::TreeBuilder::LibXML(3pm)				User Contributed Perl Documentation			    HTML::TreeBuilder::LibXML(3pm)

NAME

       HTML::TreeBuilder::LibXML - HTML::TreeBuilder and XPath compatible interface with libxml

SYNOPSIS

	   use HTML::TreeBuilder::LibXML;

	   my $tree = HTML::TreeBuilder::LibXML->new;
	   $tree->parse($html);
	   $tree->eof;

	   # $tree and $node compatible to HTML::Element
	   my @nodes = $tree->findvalue($xpath);
	   for my $node (@nodes) {
	       print $node->tag;
	       my %attr = $node->all_external_attr;
	   }

	   HTML::TreeBuilder::LibXML->replace_original(); # replace HTML::TreeBuilder::XPath->new

DESCRIPTION

       HTML::TreeBuilder::XPath is libxml based compatible interface to HTML::TreeBuilder, which could be slow for a large document.

       HTML::TreeBuilder::LibXML is drop-in-replacement for HTML::TreeBuilder::XPath.

       This module doesn't implement all of HTML::TreeBuilder and HTML::Element APIs, but enough methods are defined so modules like Web::Scraper
       work.

BENCHMARK

       This is a benchmark result by tools/benchmark.pl

	       Web::Scraper: 0.26
	       HTML::TreeBuilder::XPath: 0.09
	       HTML::TreeBuilder::LibXML: 0.01_01

			    Rate  no_libxml use_libxml
	       no_libxml  5.45/s	 --	  -94%
	       use_libxml 94.3/s      1632%	    --

AUTHOR

       Tokuhiro Matsuno <tokuhirom  slkjfd gmail.com>

       Tatsuhiko Miyagawa <miyagawa@cpan.org>

       Masahiro Chiba

THANKS TO

       woremacx++ http://d.hatena.ne.jp/woremacx/20080202/1201927162

       id:dailyflower

SEE ALSO

       HTML::TreeBuilder, HTML::TreeBuilder::XPath

LICENSE

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

perl v5.14.2							    2012-04-02					    HTML::TreeBuilder::LibXML(3pm)

XML::TreeBuilder(3)					User Contributed Perl Documentation				       XML::TreeBuilder(3)

NAME

       XML::TreeBuilder - Parser that builds a tree of XML::Element objects

SYNOPSIS

	 foreach my $file_name (@ARGV) {
	   my $tree = XML::TreeBuilder->new({ 'NoExpand' => 0, 'ErrorContext' => 0 }); # empty tree
	   $tree->parse_file($file_name);
	   print "Hey, here's a dump of the parse tree of $file_name:
";
	   $tree->dump; # a method we inherit from XML::Element
	   print "And here it is, bizarrely rerendered as XML:
",
	     $tree->as_XML, "
";

	   # Now that we're done with it, we must destroy it.
	   $tree = $tree->delete;
	 }

DESCRIPTION

       This module uses XML::Parser to make XML document trees constructed of XML::Element objects (and XML::Element is a subclass of
       HTML::Element adapted for XML).	XML::TreeBuilder is meant particularly for people who are used to the HTML::TreeBuilder / HTML::Element
       interface to document trees, and who don't want to learn some other document interface like XML::Twig or XML::DOM.

       The way to use this class is to:

       1. start a new (empty) XML::TreeBuilder object.

       2. set any of the "store" options you want.

       3. then parse the document from a source by calling "$x->parsefile(...)"  or "$x->parse(...)" (See XML::Parser docs for the options that
       these two methods take)

       4. do whatever you need to do with the syntax tree, presumably involving traversing it looking for some bit of information in it,

       5. and finally, when you're done with the tree, call $tree->delete to erase the contents of the tree from memory.  This kind of thing
       usually isn't necessary with most Perl objects, but it's necessary for TreeBuilder objects.  See HTML::Element for a more verbose
       explanation of why this is the case.

METHODS AND ATTRIBUTES

       XML::TreeBuilder is a subclass of XML::Element, which in turn is a subclass of HTML:Element.  You should read and understand the
       documentation for those two modules.

       An XML::TreeBuilder object is just a special XML::Element object that allows you to call these additional methods:

       $root = XML::TreeBuilder->new()
	   Construct a new XML::TreeBuilder object.

	   Parameters:

	   NoExpand
		   Passed to XML::Parser. Do not Expand external entities.
		   Deafult: undef

	   ErrorContext
		   Passed to XML::Parser. Number of context lines to generate on errors.
		   Deafult: undef

       $root->eof
	   Deletes parser object.

       $root->parse(...options...)
	   Uses XML::Parser's "parse" method to parse XML from the source(s?)  specified by the options.  See XML::Parse

       $root->parsefile(...options...)
	   Uses XML::Parser's "parsefile" method to parse XML from the source(s?)  specified by the options.  See XML::Parse

       $root->parse_file(...options...)
	   Simply an alias for "parsefile".

       $root->store_comments(value)
	   This determines whether TreeBuilder will normally store comments found while parsing content into $root.  Currently, this is off by
	   default.

       $root->store_declarations(value)
	   This determines whether TreeBuilder will normally store markup declarations found while parsing content into $root.	Currently, this is
	   off by default.

       $root->store_pis(value)
	   This determines whether TreeBuilder will normally store processing instructions found while parsing content into $root.  Currently,
	   this is off (false) by default.

       $root->store_cdata(value)
	   This determines whether TreeBuilder will normally store CDATA sectitons found while parsing content into $root. Adds a ~cdata node.

	   Currently, this is off (false) by default.

SEE ALSO

       XML::Parser, XML::Element, HTML::TreeBuilder, HTML::DOMbo.

       And for alternate XML document interfaces, XML::DOM and XML::Twig.

COPYRIGHT AND DISCLAIMERS

       Copyright (c) 2000,2004 Sean M. Burke.  All rights reserved.

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

       This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of
       merchantability or fitness for a particular purpose.

AUTHOR

       Current Author:	    Jeff Fearn <jfearn@cpan.org>.

       Former Authors:	    Sean M. Burke, <sburke@cpan.org>

perl v5.16.3							    2014-06-09						       XML::TreeBuilder(3)