public override bool Parse(ItemFactory itemFactory, ITextProvider text, TokenStream tokens)
{
if (tokens.CurrentToken.TokenType != CssTokenType.OpenSquareBracket)
{
return(false);
}
// Collect each piece of "[ name = value ]", any of which could be missing after the '['
OpenBracket = Children.AddCurrentAndAdvance(tokens, CssClassifierContextType.SquareBracket);
if (ItemName.IsAtItemName(tokens))
{
AttributeName = itemFactory.CreateSpecific <ItemName>(this);
AttributeName.Parse(itemFactory, text, tokens);
AttributeName.Context = CssClassifierContextCache.FromTypeEnum(CssClassifierContextType.ElementAttribute);
Children.Add(AttributeName);
}
else
{
OpenBracket.AddParseError(ParseErrorType.AttributeSelectorElementMissing, ParseErrorLocation.AfterItem);
}
switch (tokens.CurrentToken.TokenType)
{
case CssTokenType.BeginsWith: // ^=
case CssTokenType.EndsWith: // $=
case CssTokenType.OneOf: // ~=
case CssTokenType.ListBeginsWith: // |=
case CssTokenType.ContainsString: // *=
case CssTokenType.Equals: // =
Operation = Children.AddCurrentAndAdvance(tokens, CssClassifierContextType.SelectorOperator);
break;
}
if (tokens.CurrentToken.TokenType == CssTokenType.Identifier)
{
AttributeValue = Children.AddCurrentAndAdvance(tokens, CssClassifierContextType.ElementAttributeValue);
}
else if (tokens.CurrentToken.IsString())
{
AttributeValue = Children.AddCurrentAndAdvance(tokens, CssClassifierContextType.ElementAttributeValue);
}
if (AttributeValue != null && Operation == null)
{
AttributeValue.AddParseError(ParseErrorType.AttributeSelectorOperationMissing, ParseErrorLocation.BeforeItem);
}
else if (AttributeValue == null && Operation != null)
{
Operation.AddParseError(ParseErrorType.AttributeSelectorValueMissing, ParseErrorLocation.AfterItem);
}
if (AttributeValue != null && tokens.CurrentToken.TokenType == CssTokenType.Identifier)
{
OperationModifier = Children.AddCurrentAndAdvance(tokens, CssClassifierContextType.SelectorOperator);
if (OperationModifier.Length != 1 || text[OperationModifier.Start] != 'i')
{
OperationModifier.AddParseError(ParseErrorType.UnexpectedToken, ParseErrorLocation.WholeItem);
}
}
if (tokens.CurrentToken.TokenType == CssTokenType.CloseSquareBracket)
{
CloseBracket = Children.AddCurrentAndAdvance(tokens, CssClassifierContextType.SquareBracket);
}
else
{
AddParseError(ParseErrorType.AttributeSelectorCloseBracketMissing, ParseErrorLocation.AfterItem);
}
return(Children.Count > 0);
}