SYNOPSIS
use HTML::Selector::XPath;
my $selector = HTML::Selector::XPath->new("li#main");
$selector->to_xpath; # //li[@id='main']
# functional interface
use HTML::Selector::XPath 'selector_to_xpath';
my $xpath = selector_to_xpath('div.foo');
my $relative = selector_to_xpath('div.foo', root => '/html/body/p' );
# /html/body/p/div[contains(concat(' ', @class, ' '), ' foo ')]
my $relative = selector_to_xpath('div:root', root => '/html/body/p' );
# /html/body/p/div
DESCRIPTION
HTML::Selector::XPath is a utility function to compile full set of CSS2 and partial CSS3 selectors to the equivalent XPath expression.FUNCTIONS and METHODS
- selector_to_xpath
-
$xpath = selector_to_xpath($selector, %options);
Shortcut for "HTML::Selector->new(shift)->to_xpath(@_)". Exported upon request.
- new
-
$sel = HTML::Selector::XPath->new($selector, %options);
Creates a new object.
- to_xpath
-
$xpath = $sel->to_xpath; $xpath = $sel->to_xpath(root => "."); # ./foo instead of //foo
Returns the translated XPath expression. You can optionally pass "root" parameter, to specify which root to start the expression. It defaults to "/".
The optional "prefix" option allows you to specify a namespace prefix for the generated XPath expression.
SUBCLASSING NOTES
- parse_pseudo
- This method is called during xpath construction when we encounter a pseudo selector (something that begins with comma). It is passed the selector and a reference to the string we are parsing. It should return one or more xpath sub-expressions to add to the parts if the selector is handled, otherwise return an empty list.
CAVEATS
CSS SELECTOR VALIDATION
This module doesn't validate whether the original CSS Selector expression is valid. For example,
div.123foo
is an invalid CSS selector (class names should not begin with numbers), but this module ignores that and tries to generate an equivalent XPath expression anyway.
COPYRIGHT
Tatsuhiko Miyagawa 2006-2011Max Maischein 2011-
AUTHOR
Tatsuhiko Miyagawa <[email protected]>Most of the logic is based on Joe Hewitt's getElementsBySelector.js on <http://www.joehewitt.com/blog/2006-03-20.php> and Andrew Dupont's patch to Prototype.js on <http://dev.rubyonrails.org/ticket/5171>, but slightly modified using Aristotle Pegaltzis' CSS to XPath translation table per <http://plasmasturm.org/log/444/>
Also see
<http://www.mail-archive.com/[email protected]/msg00906.html>
and
<http://kilianvalkhof.com/2008/css-xhtml/the-css3-not-selector/>