private static CssPseudoClass[] ParsePseudoClasses(CssStringStreamReader reader)
{
var classes = new List <CssPseudoClass>();
while (reader.CurrentChar == ':')
{
reader.Advance();
if (!reader.TryReadIdentifier(out var className))
{
return(null);
}
if (CssFunctionalPseudoClass.TryConvertToFunctionalPseudoClassType(className, out var functionalClassType))
{
if (!reader.Read('(') ||
!TryParseSelectorList(reader, out var functionalSelectors) ||
!reader.Read(')'))
{
return(null);
}
classes.Add(new CssFunctionalPseudoClass(functionalSelectors, functionalClassType));
continue;
}
if (CssUserActionPseudoClass.TryConvertToUserActionPseudoClassType(className, out var userActionClassType))
{
classes.Add(new CssUserActionPseudoClass(userActionClassType));
continue;
}
if (CssStructuralPseudoClass.TryConvertToStructuralPseudoClassType(className, out var structuralPseudoClassType))
{
if (!reader.Read('(') ||
!TryParseSelectorList(reader, out var structuralSelectors) ||
!reader.Read(')'))
{
structuralSelectors = new CssSelectorList();
}
classes.Add(new CssStructuralPseudoClass(structuralSelectors, structuralPseudoClassType));
continue;
}
return(null); // unknown / unhandled pseudo class
}
return(classes.ToArray());
}
public static bool TryParseSelectorList(CssStringStreamReader reader, out CssSelectorList selectors)
{
selectors = new CssSelectorList();
while (!reader.IsEndOfStream)
{
if (!TryParseComplexSelector(reader, out var complex))
{
break;
}
selectors.Add(Flatten(complex));
reader.SkipWhitespaceAndComments();
if (reader.CurrentChar != ',')
{
break;
}
reader.Advance();
}
return(selectors.Count > 0);
}
public CssStyleRule(CssSelectorList selectors, IReadOnlyDictionary <string, CssStylePropertyValue> properties)
{
Selectors = selectors ?? throw new ArgumentNullException(nameof(selectors));
Properties = properties ?? throw new ArgumentNullException(nameof(properties));
}
public CssFunctionalPseudoClass(CssSelectorList selectors, CssFunctionalPseudoClassType pseudoClassType)
{
Selectors = selectors ?? throw new ArgumentNullException(nameof(selectors));
FunctionalPseudoClassType = pseudoClassType;
}