// consume exactly 1 partial-step
INodeMatcher ConsumePartialStep()
{
CssToken t = GetNext();
switch (t.Type)
{
case CssTokenType.Name: return(new NameSelector(t.Text));
case CssTokenType.Class: return(AttributeSelector.ContainsClass(t.Text.Substring(1)));
case CssTokenType.Id: return(AttributeSelector.IdIs(t.Text.Substring(1)));
case CssTokenType.Square: {
CssToken insideText = GetNext();
GetNext(); // throw away closing token
return(ParseAttribute(insideText.Text));
}
case CssTokenType.Pseudo:
switch (t.Text)
{
case ":even": return(SiblingSelector.Even);
case ":odd": return(SiblingSelector.Odd);
case ":nth-child": _index += 3; return(ParseSibling(_tokens[_index - 2].Text));
case ":contains": _index += 3; return(new ContainsTextSelector(_tokens[_index - 2].Text));
default: _index += 3; return(ParseColon(t.Text));
}
}
--_index; // If didn't use it, we need to push it back onto the stream
return(null);
}