IgnoreElementComparer.cs

namespace AngleSharp.Diffing.Strategies.ElementStrategies;

/// <summary>
/// Represents the ignore element comparer.
/// </summary>
public static class IgnoreElementComparer
{
    private const string DIFF_IGNORE_ATTRIBUTE = "diff:ignore";

    /// <summary>
    /// The ignore element comparer.
    /// </summary>
    public static CompareResult Compare(in Comparison comparison, CompareResult currentDecision)
    {
        if (currentDecision.Decision.HasFlag(CompareDecision.Skip))
            return currentDecision;

        return ControlHasTruthyIgnoreAttribute(comparison)
            ? CompareResult.Skip
            : currentDecision;
    }

    private static bool ControlHasTruthyIgnoreAttribute(in Comparison comparison)
    {
        return comparison.Control.Node is IElement element &&
                element.TryGetAttrValue(DIFF_IGNORE_ATTRIBUTE, out bool shouldIgnore) &&
                shouldIgnore;
    }
}