#59 ::selection throws an exception

[mercury]

Test-case:

::selection{background:green}

This throws an exception:

cz.vutbr.web.css.CSSException: Unable to parse embedded CSS style [AST]
    at cz.vutbr.web.csskit.antlr.CSSParserFactory$SourceType.encapsulateException(CSSParserFactory.java:198)
    at cz.vutbr.web.csskit.antlr.CSSParserFactory$SourceType.access$100(CSSParserFactory.java:46)
    at cz.vutbr.web.csskit.antlr.CSSParserFactory$SourceType$2.parse(CSSParserFactory.java:104)
    at cz.vutbr.web.csskit.antlr.CSSParserFactory.parseAndImport(CSSParserFactory.java:345)
    at cz.vutbr.web.csskit.antlr.CSSParserFactory.parse(CSSParserFactory.java:234)
    at cz.vutbr.web.csskit.antlr.CSSParserFactory.parse(CSSParserFactory.java:262)
Caused by: java.lang.NullPointerException
    at cz.vutbr.web.csskit.antlr.CSSTreeParser.pseudo(CSSTreeParser.java:3634)
    at cz.vutbr.web.csskit.antlr.CSSTreeParser.selpart(CSSTreeParser.java:3088)
    at cz.vutbr.web.csskit.antlr.CSSTreeParser.selector(CSSTreeParser.java:2964)
    at cz.vutbr.web.csskit.antlr.CSSTreeParser.combined_selector(CSSTreeParser.java:2652)
    at cz.vutbr.web.csskit.antlr.CSSTreeParser.ruleset(CSSTreeParser.java:1511)
    at cz.vutbr.web.csskit.antlr.CSSTreeParser.statement(CSSTreeParser.java:565)
    at cz.vutbr.web.csskit.antlr.CSSTreeParser.stylesheet(CSSTreeParser.java:475)
    at cz.vutbr.web.csskit.antlr.CSSParserFactory$SourceType$2.parse(CSSParserFactory.java:99)
    ... 34 more

[mercury]

Although ::selection is not in w3c standards, it is used in many css files already.

I think the bigger issue is: Even if jStyleParser doesn't add support for ::selection, it should IMO ignore such rules and gracefully handle the remaining rules.

Thanks!

[Radek Burget]

Oops, this was a bug in the declaration testing. It should be fixed now.

[Chetan Kothari]

Thanks for the fix.

Added supporting test cases and made a PR