private bool TryCombinator()
{
//combinator
// /* combinators can be surrounded by whitespace */
// : PLUS S* | GREATER S* | TILDE S* | S+
// ;
var token = TryRead(ToTokenSpec(TokenKind.Plus), ToTokenSpec(TokenKind.Greater), ToTokenSpec(TokenKind.Tilde), ToTokenSpec(TokenKind.WhiteSpace));
if (token == null)
{
return(false);
}
if (token.Value.Kind == TokenKind.WhiteSpace)
{
_generator.Descendant();
}
else
{
switch (token.Value.Kind)
{
case TokenKind.Tilde: _generator.GeneralSibling(); break;
case TokenKind.Greater: _generator.Child(); break;
case TokenKind.Plus: _generator.Adjacent(); break;
}
TryRead(ToTokenSpec(TokenKind.WhiteSpace));
}
return(true);
}