/// <summary>
/// Skip over a complete block of unknown content
/// </summary>
public override bool Parse(ItemFactory itemFactory, ITextProvider text, TokenStream tokens)
{
// Save the opening token for this block
OpenBlock = Children.AddCurrentAndAdvance(tokens, null);
CssTokenType matchingEndType = GetMatchingTokenType(OpenBlock.TokenType);
Debug.Assert(matchingEndType != CssTokenType.Unknown);
// Search for the matching end of the block
bool invalidBlock = false;
while (!invalidBlock &&
tokens.CurrentToken.TokenType != matchingEndType &&
!tokens.CurrentToken.IsScopeBlocker())
{
// Treat the contents of the block as property values so that units, functions, etc. get parsed
ParseItem pi = PropertyValueHelpers.ParsePropertyValue(this, itemFactory, text, tokens);
if (pi != null)
{
Children.Add(pi);
}
else
{
switch (tokens.CurrentToken.TokenType)
{
case CssTokenType.CloseCurlyBrace:
case CssTokenType.CloseFunctionBrace:
case CssTokenType.CloseSquareBracket:
// Found a non-matching end brace/bracket, so stop parsing
invalidBlock = true;
break;
default:
Children.AddUnknownAndAdvance(itemFactory, text, tokens);
break;
}
}
}
if (tokens.CurrentToken.TokenType == matchingEndType)
{
CloseBlock = Children.AddCurrentAndAdvance(tokens, null);
}
else
{
OpenBlock.AddParseError(ParseErrorType.CloseBraceMismatch, ParseErrorLocation.AfterItem);
}
return(Children.Count > 0);
}
protected virtual void ParsePropertyValue(ItemFactory itemFactory, ITextProvider text, TokenStream tokens)
{
ParseItem item = PropertyValueHelpers.ParsePropertyValue(this, itemFactory, text, tokens);
if (item != null)
{
Values.Add(item);
Children.Add(item);
}
else
{
Children.AddUnknownAndAdvance(itemFactory, text, tokens, ParseErrorType.PropertyValueExpected);
}
}
protected virtual void ParseArgument(ItemFactory itemFactory, ITextProvider text, TokenStream tokens)
{
while (!tokens.CurrentToken.IsFunctionArgumentTerminator())
{
ParseItem pi = PropertyValueHelpers.ParsePropertyValue(this, itemFactory, text, tokens);
if (pi != null)
{
ArgumentItems.Add(pi);
Children.Add(pi);
}
else
{
// An unknown item is not an error
pi = Children.AddUnknownAndAdvance(itemFactory, text, tokens);
ArgumentItems.Add(pi);
}
}
}