public static Selector Parse(string str)
{
Selector result = new Selector();
SelectorReader reader = new SelectorReader(str);
SelectorCombinator combinator = null;
SimpleSelectorChain simpleSelectors = new SimpleSelectorChain();
while (!reader.EndOfStream)
{
switch (reader.Status)
{
case SelectorReader.ReadStatus.Combinator:
result.Add(combinator, simpleSelectors);
combinator = reader.ReadCombinator();
simpleSelectors = new SimpleSelectorChain();
break;
case SelectorReader.ReadStatus.SimpleSelector:
SimpleSelector simpleSelector = reader.ReadSimpleSelector();
if (simpleSelector.Type == SelectorType.PseudoElement)
{
result.PseudoElementSelector = simpleSelector;
}
simpleSelectors.Add(simpleSelector);
break;
}
}
result.Add(combinator, simpleSelectors);
return result;
}
public void Add(SelectorCombinator combinator, SimpleSelectorChain selector)
{
if (Chain.Count > 0 && combinator == null)
throw new ArgumentNullException("Combinator could not be null if selector is not in first node of chain.");
Chain.Add(new Tuple<SelectorCombinator, SimpleSelectorChain>(combinator, selector));
}