CSS3 :not() with children selectors

[rrivas]

When I attempt to use nokogiri with doc.css('.r .l:not(.mslg .l)') I receive the error

Nokogiri::CSS::SyntaxError: unexpected ' ' after '#<Nokogiri::CSS::Node:0x007fb4ab5f4940>'

I am simply trying to get urls from a google search page. This is what I'm doing

doc = Nokogiri::HTML(open("http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=Honda+Cerritos+CA"))
doc.css('.r .l:not(.mslg .l)')

[MatmaRex]

This doesn't appear to be valid CSS. It doesn't work in broswer and doesn't pass the validator.

Here's an equivalent, valid code:

*:not(.mslg) .r .l

Or possibly: (I'm not sure what you want - this is an exact equivalent of what I assume you meant)

*:not(.mslg) .r:not(.mslg) .l

[rrivas]

What I am attempting to do is get all of the organic urls on the google page. I am using selector gadget (http://www.selectorgadget.com/) to find an accurate path and it tells me that the path I created is an accurate CSS path.

What I am attempting to get is the items in green (http://i.imgur.com/fQ5Jv.png). It could also be that selector gadgets paths are not working properly. I will try your suggestions.

[flavorjones]

This is a valid request. Currently the state of our CSS selector parsing is a bit complex, which we're planning on overhauling for the next major release.

[ju1ius]

.r .l:not(.mslg .l)

This is not valid CSS.
The w3c CSS3 spec allows only one simple_selector inside a :not() functional pseudo-class.
A simple_selector is a selector that does not contain any combinator (descendant nor sibling).
CSS4 might allow a (comma-separated) list of simple selectors, but still no combinator.
So it's a safe bet to say that this selector will be invalid for at least the next 10 years...

[flavorjones]

My previous comment, "This is a valid request" was not referencing the CSS spec -- it was stating my opinion that there's no technological reason we couldn't support this syntax. We already support some jQuery query syntax.

[flavorjones]

I'm open to accepting a pull request for this functionality, but am unlikely to do that work myself. Closing.