public virtual ParseItem CreateNextChild(ParseItem previousChild, ItemFactory itemFactory, ITextProvider text, TokenStream tokens)
{
if (IsNestedBlock)
{
if (tokens.CurrentToken.IsScopeBlocker())
{
return(null);
}
// Only nested stylesheets (like in @media) should look for braces
if (previousChild is TokenItem && ((TokenItem)previousChild).TokenType == CssTokenType.CloseCurlyBrace)
{
// No more children after the close curly brace
return(null);
}
if (previousChild == null && tokens.CurrentToken.TokenType != CssTokenType.OpenCurlyBrace)
{
// First child must be a curly brace
return(null);
}
if (tokens.CurrentToken.TokenType == CssTokenType.OpenCurlyBrace)
{
return((previousChild == null) ? new TokenItem(tokens.AdvanceToken(), CssClassifierContextType.CurlyBrace) : null);
}
if (tokens.CurrentToken.TokenType == CssTokenType.CloseCurlyBrace)
{
return(new TokenItem(tokens.AdvanceToken(), CssClassifierContextType.CurlyBrace));
}
}
ParseItem newChild = null;
switch (tokens.CurrentToken.TokenType)
{
case CssTokenType.EndOfFile:
break;
case CssTokenType.ScopeBlocker:
newChild = UnknownItem.ParseUnknown(this, itemFactory, text, tokens);
break;
case CssTokenType.At:
newChild = AtDirective.ParseDirective(this, itemFactory, text, tokens);
break;
default:
newChild = ParseDefaultChild(itemFactory, text, tokens);
break;
}
return(newChild);
}
protected virtual ParseItem ParseDefaultChild(ItemFactory itemFactory, ITextProvider text, TokenStream tokens)
{
ParseItem newChild = itemFactory.Create <RuleSet>(this);
if (!newChild.Parse(itemFactory, text, tokens))
{
newChild = UnknownItem.ParseUnknown(this, itemFactory, text, tokens, ParseErrorType.UnexpectedToken);
}
return(newChild);
}
protected virtual ParseItem CreateDefaultChild(ItemFactory itemFactory, ITextProvider text, TokenStream tokens)
{
ParseItem newChild = itemFactory.Create <Declaration>(this);
if (!newChild.Parse(itemFactory, text, tokens))
{
newChild = UnknownItem.ParseUnknown(this, itemFactory, text, tokens, ParseErrorType.DeclarationExpected);
}
return(newChild);
}