internal CssSelectorCombination(CssCombinator combinator, ICssSelectorChain leftOperand, ICssSelectorSequence rightOperand)
: base(CalculateSpecificity(leftOperand, rightOperand))
{
ArgChecker.AssertIsTrue <ArgumentException>(leftOperand.Subject.PseudoElement == null,
"Pseudo-elements are only allowed in the right operand of a combinator");
_combinator = combinator;
_leftOperand = leftOperand;
_rightOperand = rightOperand;
}
/// <summary>
/// Creates a selector consisting of two selector sequences and a <see cref="CssCombinator"/>.
/// </summary>
/// <param name="leftSelector">The left operand of the combination operator.</param>
/// <param name="combinator">The combination operator.</param>
/// <param name="rightSelector">The right operand of the combination operator.</param>
/// <returns>The newly created combined selector.</returns>
public static ICssSelectorChain Combine(this ICssSelectorChain leftSelector, CssCombinator combinator, ICssSelectorSequence rightSelector)
{
return(new CssSelectorCombination(combinator, leftSelector, rightSelector));
}
private static CssSpecificity CalculateSpecificity(ICssSelectorChain leftOperand, ICssSelectorSequence rightOperand)
{
ArgChecker.AssertArgNotNull(leftOperand, nameof(leftOperand));
ArgChecker.AssertArgNotNull(rightOperand, nameof(rightOperand));
return(leftOperand.Specificity + rightOperand.Specificity);
}
