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

namespace SixLabors.Fonts.Tables.AdvancedTypographic.GSub {
  /// <summary>
  /// A placeholder lookup subtable used when the lookup type is not implemented.
  /// This subtable always returns <see langword="false"/> for substitution attempts.
  /// </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 TrySubstitution(
          FontMetrics fontMetrics,
          GSubTable table,
          GlyphSubstitutionCollection collection,
          Tag feature,
          int index,
          int count)
          => false;
  }
}