HTML::Selector::XPath(User Contributed Perl DocumentatHTML::Selector::XPath(3)NAMEHTML::Selector::XPath - CSS Selector to XPath compiler
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
DESCRIPTIONHTML::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 2006-2011
Max Maischein 2011-
AUTHOR
Tatsuhiko Miyagawa <miyagawa@bulknews.net>
Most of the logic is based on Joe Hewitt's getElementsBySelector.js on
http://www.joehewitt.com/blog/2006-03-20.php
<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/www-archive@w3.org/msg00906.html
<http://www.mail-archive.com/www-archive@w3.org/msg00906.html>
and
http://kilianvalkhof.com/2008/css-xhtml/the-css3-not-selector/
<http://kilianvalkhof.com/2008/css-xhtml/the-css3-not-selector/>
LICENSE
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
SEE ALSO
http://www.w3.org/TR/REC-CSS2/selector.html <http://www.w3.org/TR/REC-
CSS2/selector.html> <http://use.perl.org/~miyagawa/journal/31090>
perl v5.14.2 2012-01-16 HTML::Selector::XPath(3)