HTML::TreeBuilder::XPaUser)Contributed Perl DocumenHTML::TreeBuilder::XPath(3)NAMEHTML::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
$tree->delete; # to avoid memory leaks, if you parse many HTML documents
DESCRIPTION
This module adds typical XPath methods to HTML::TreeBuilder, to make it
easy to query a document.
METHODS
Extra methods added both to the tree object and to each element:
findnodes ($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, as one string.
findnodes_as_strings ($path)
Returns a list of the values of the result nodes.
findvalue ($path)
Returns either a "Tree::XPathEngine::Literal", a
"Tree::XPathEngine::Boolean" or a "Tree::XPathEngine::Number" object.
If the path returns a NodeSet, $nodeset->xpath_to_literal is called
automatically for you (and thus a "Tree::XPathEngine::Literal" is
returned). Note that for each of the objects stringification is
overloaded, so you can just print the value found, or manipulate it in
the ways you would a normal perl value (e.g. using regular
expressions).
findvalues ($path)
Returns the values of the matching nodes as a list. This is mostly the
same as findnodes_as_strings, except that the elements of the list are
objects (with overloaded stringification) instead of plain strings.
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.
as_XML_compact
HTML::TreeBuilder's "as_XML" output is not really nice to look at, so I
added a new method, that can be used as a simple replacement for it.
It escapes only the '<', '>' and '&' (plus '"' in attribute values),
and wraps CDATA elements in CDATA sections.
Note that the XML is actually not garanteed to be valid at this point.
Nothing is done about the encoding of the string. Patches or just ideas
of how it could work are welcome.
as_XML_indented
Same as as_XML, except that the output is indented.
SEE ALSO
HTML::TreeBuilder
XML::XPathEngine
REPOSITORY
https://github.com/mirod/HTML--TreeBuilder--XPath
<https://github.com/mirod/HTML--TreeBuilder--XPath>
AUTHOR
Michel Rodriguez, <mirod@cpan.org>
COPYRIGHT AND LICENSE
Copyright (C) 2006-2011 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.
perl v5.14.1 2011-09-20 HTML::TreeBuilder::XPath(3)
