NAME

HTML::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

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);

Shortcut for HTML::Selector->new(shift)->to_xpath(@_). Exported upon request.

new

  $sel = HTML::Selector::XPath->new($selector);

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 /.

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 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

and

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://use.perl.org/~miyagawa/journal/31090