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HTML::TreeBuilder::XPath.3pm

NAME

HTML::TreeBuilder::XPath - add XPath support to HTML::TreeBuilder

SYNOPSIS

   use HTML::TreeBuilder::XPath;
   my $tree= HTML::TreeBuilder::XPath->new;
   $tree->parse_file( "mypage.html");
   my $nb=$tree->findvalue( '/html/body//p[@class="section_title"]/span[@class="nb"]');
   my $id=$tree->findvalue( '/html/body//p[@class="section_title"]/@id');
 
   my $p= $html->findnodes( '//p[@id="toto"]')->[0];
   my $link_texts= $p->findvalue( './a'); # the texts of all a elements in $p
 
 

DESCRIPTION

This module adds typical XPath methods to HTML::TreeBuilder, to make it easy to query a document.

METHODS

Extra methods added both to the tree object and to each element:

findnodes ($path)

Returns a list of nodes found by $path. In scalar context returns an "Tree::XPathEngine::NodeSet" object.

findnodes_as_string ($path)

Returns the text values of the nodes

findvalue ($path)

Returns either a "Tree::XPathEngine::Literal", a "Tree::XPathEngine::Boolean" or a "Tree::XPathEngine::Number" object. If the path returns a NodeSet, $nodeset->xpath_to_literal is called automatically for you (and thus a "Tree::XPathEngine::Literal" is returned). Note that for each of the objects stringification is overloaded, so you can just print the value found, or manipulate it in the ways you would a normal perl value (e.g. using regular expressions).

exists ($path)

Returns true if the given path exists.

matches($path)

Returns true if the element matches the path.

find ($path)

The find function takes an XPath expression (a string) and returns either a Tree::XPathEngine::NodeSet object containing the nodes it found (or empty if no nodes matched the path), or one of XML::XPathEngine::Literal (a string), XML::XPathEngine::Number, or XML::XPathEngine::Boolean. It should always return something - and you can use ->isa() to find out what it returned. If you need to check how many nodes it found you should check $nodeset->size. See XML::XPathEngine::NodeSet.

SEE ALSO

HTML::TreeBuilder

XML::XPathEngine

AUTHOR

Michel Rodriguez, <mirod@cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2006 by Michel Rodriguez

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.4 or, at your option, any later version of Perl 5 you may have available.