HTML::TreeBuilder::XPath - add XPath support to HTML::TreeBuilder
my $tree= HTML::TreeBuilder::XPath->new;
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"]')->;
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
This module adds typical XPath methods to HTML::TreeBuilder, to make it easy to
query a document.
Extra methods added both to the tree object and to each element:
Returns a list of nodes found by $path. In scalar context returns an
Returns the text values of the nodes, as one string.
Returns a list of the values of the result nodes.
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
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.
Returns true if the given path exists.
Returns true if the element matches the 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.
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.
Same as as_XML, except that the output is indented.
Michel Rodriguez, <firstname.lastname@example.org>
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.