// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

namespace SixLabors.Fonts.Tables.AdvancedTypographic.GPos {
  /// <summary>
  /// A placeholder subtable used for unimplemented or unrecognized GPOS lookup types.
  /// Always returns <see langword="false"/> from <see cref="TryUpdatePosition"/>.
  /// </summary>
  internal class NotImplementedSubTable : LookupSubTable
  {
      /// <summary>
      /// Initializes a new instance of the <see cref="NotImplementedSubTable"/> class.
      /// </summary>
      public NotImplementedSubTable()
          : base(default, 0)
      {
      }

      /// <inheritdoc/>
      public override bool TryUpdatePosition(
          FontMetrics fontMetrics,
          GPosTable table,
          GlyphPositioningCollection collection,
          Tag feature,
          int index,
          int count)
          => false;
  }
}