https://bugs.webkit.org/show_bug.cgi?id=83885

Patch by Uday Kiran <udaykiran@motorola.com> on 2012-04-16
Reviewed by Zoltan Herczeg.

Source/WebCore:

Parsing fix for CSS3 selectors :nth-child(), :nth-last-child() :nth-of-type() :nth-last-of-type()
with values -n-b and n-b as they are of valid form an+b where a and b are integers.
http://www.w3.org/TR/selectors/#structural-pseudos

Descriptors of form n-b or -n-b, where b is number, are valid CSS identifiers.
However, in NthChildMode we need to check whether this identifier is a valid nth child descriptor.
The original code only checked this if the string was n- or -n- but this is not enough.
We need to check everything which starts with an n- or -n- prefix.

Test: css3/parsing-css3-nthchild.html

* css/CSSParser.cpp:
(WebCore::CSSParser::lex):

LayoutTests:

* css3/parsing-css3-nthchild-expected.txt: Added.
* css3/parsing-css3-nthchild.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114261 268f45cc-cd09-0410-ab3c-d52691b4dbfc