/// <summary>
/// Picks a simple selector from the stream of tokens.
/// </summary>
/// <param name="tokens">The stream of tokens to consider.</param>
/// <returns>The created selector.</returns>
public SimpleSelector GetSimpleSelector(IEnumerator <CssToken> tokens)
{
while (tokens.MoveNext())
{
switch (tokens.Current.Type)
{
//Begin of attribute [A]
case CssTokenType.SquareBracketOpen:
{
var sel = GetAttributeSelector(tokens);
if (sel != null)
{
return(sel);
}
}
break;
//Begin of Pseudo :P
case CssTokenType.Colon:
{
var sel = GetPseudoSelector(tokens);
if (sel != null)
{
return(sel);
}
}
break;
//Begin of ID #I
case CssTokenType.Hash:
return(SimpleSelector.Id(((CssKeywordToken)tokens.Current).Data));
//Begin of Type E
case CssTokenType.Ident:
return(SimpleSelector.Type(((CssKeywordToken)tokens.Current).Data));
//Various
case CssTokenType.Delim:
if (((CssDelimToken)tokens.Current).Data == Specification.DOT && tokens.MoveNext() && tokens.Current.Type == CssTokenType.Ident)
{
return(SimpleSelector.Class(((CssKeywordToken)tokens.Current).Data));
}
break;
//All others are being ignored
case CssTokenType.Whitespace:
case CssTokenType.Comma:
default:
break;
}
}
return(null);
}
/// <summary>
/// Invoked once a colon has been found in the token enumerator.
/// </summary>
/// <param name="token">The token.</param>
/// <returns>True if no error occurred, otherwise false.</returns>
Boolean OnClass(CssToken token)
{
state = State.Data;
if (token.Type == CssTokenType.Ident)
{
Insert(SimpleSelector.Class(token.Data));
return(true);
}
return(false);
}
/// <summary>
/// Invoked once a colon has been found in the token enumerator.
/// </summary>
/// <param name="token">The token.</param>
void OnClass(CssToken token)
{
state = State.Data;
ready = true;
if (token.Type == CssTokenType.Ident)
{
Insert(SimpleSelector.Class(token.Data));
}
else
{
valid = false;
}
}
/// <summary>
/// Invoked once a delimiter has been found in the token enumerator.
/// </summary>
/// <param name="tokens">The token source.</param>
public void OnDelim(IEnumerator <CssToken> tokens)
{
var chr = ((CssDelimToken)tokens.Current).Data;
switch (chr)
{
case Specification.COMMA:
InsertOr();
break;
case Specification.GT:
Insert(CssCombinator.Child);
break;
case Specification.PLUS:
Insert(CssCombinator.AdjacentSibling);
break;
case Specification.TILDE:
Insert(CssCombinator.Sibling);
break;
case Specification.ASTERISK:
Insert(SimpleSelector.All);
break;
case Specification.DOT:
if (tokens.MoveNext() && tokens.Current.Type == CssTokenType.Ident)
{
var cls = (CssKeywordToken)tokens.Current;
Insert(SimpleSelector.Class(cls.Data));
}
else if (!ignoreErrors)
{
throw new DOMException(ErrorCode.SyntaxError);
}
else
{
return;
}
break;
}
}