private static Expression ParseOperand(TokensQueue tokens)
{
tokens.SkipWhiteAndComments();
var token = tokens.Read();
switch (token.Type) {
case TokenType.Number: return ParseNumber(ref token, tokens);
case TokenType.Literal: return ParseLiteral(ref token, tokens);
case TokenType.Hash: return ParseHashColor(ref token, tokens);
case TokenType.Minus: return new NegateExpression(ParseOperand(tokens));
case TokenType.OpenParenthesis:
var inner = Parse(tokens);
tokens.Read(TokenType.CloseParenthesis);
return inner;
default:
throw new TokenException("unexpected token " + token.StringValue, token);
}
}
private static SelectorExpression ParseOperand(TokensQueue tokens, SelectorExpression parent = null)
{
tokens.SkipWhiteAndComments();
var token = tokens.Read();
switch (token.Type) {
case TokenType.Literal: return ParseTypeSelector(token, tokens);
case TokenType.Dot: return ParseClassSelector(token, tokens);
case TokenType.Hash: return ParseIdSelector(token, tokens);
case TokenType.Colon: return ParsePseudoSelector(token, tokens);
case TokenType.OpenSquareBracket: return ParseAttributeSelector(token, tokens);
case TokenType.Ampersand: return new ParentSelector(parent);
default:
throw new TokenException("unexpected token " + token.StringValue, token);
}
}