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

namespace SixLabors.Fonts.Unicode {
  /// <summary>
  /// Unicode Indic_Conjunct_Break property values used by UAX #29 GB9c.
  /// </summary>
  /// <remarks>
  /// UAX #29 GB9c uses this property to keep matching consonant-linker-consonant
  /// sequences inside one extended grapheme cluster.
  /// <see href="https://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundary_Rules"/>
  /// </remarks>
  public enum IndicConjunctBreakClass
  {
      /// <summary>
      /// No Indic conjunct break behavior. This is the default for code points that do not
      /// participate in GB9c.
      /// </summary>
      None = 0,

      /// <summary>
      /// Consonant: a code point that can start or continue an Indic conjunct sequence.
      /// </summary>
      /// <remarks>
      /// In GB9c this is the stable anchor on either side of the linker sequence.
      /// </remarks>
      Consonant = 1,

      /// <summary>
      /// Extend: a combining or extending code point that is transparent inside an Indic conjunct sequence.
      /// </summary>
      /// <remarks>
      /// Extend code points can appear between the consonant and linker without ending
      /// the conjunct sequence.
      /// </remarks>
      Extend = 2,

      /// <summary>
      /// Linker: a code point, such as a virama, that connects a following consonant.
      /// </summary>
      /// <remarks>
      /// A linker keeps the following consonant in the same extended grapheme cluster
      /// when the surrounding GB9c pattern matches.
      /// </remarks>
      Linker = 3
  }
}