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--                            Matreshka Project                             --
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--         Localization, Internationalization, Globalization for Ada        --
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-- Copyright © 2009-2010, Vadim Godunko <vgodunko@gmail.com>                --
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--  $Revision: 2464 $ $Date: 2012-02-07 22:25:04 +0400 (Tue, 07 Feb 2012) $
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private with Matreshka.Internals.Unicode.Ucd;
private with Matreshka.Internals.Utf16;

package League.Strings.Cursors.Grapheme_Clusters is

   pragma Preelaborate;

   type Grapheme_Cluster_Cursor is tagged private;

   procedure First
    (Self : in out Grapheme_Cluster_Cursor'Class;
     Item : in out Universal_String);

   procedure Last
    (Self : in out Grapheme_Cluster_Cursor'Class;
     Item : in out Universal_String);

   procedure Next (Self : in out Grapheme_Cluster_Cursor'Class);

   procedure Previous (Self : in out Grapheme_Cluster_Cursor'Class);

   function Has_Element (Self : Grapheme_Cluster_Cursor'Class) return Boolean;

   function Element (Self : Grapheme_Cluster_Cursor'Class)
     return Universal_String;

private

   type Grapheme_Cluster_Cursor is new Abstract_Tailored_Cursor with record
      Previous_Position : Matreshka.Internals.Utf16.Utf16_String_Index;
      Previous_Length   : Natural;
      Previous_State    :
        Matreshka.Internals.Unicode.Ucd.Grapheme_Cluster_Break;
      Current_Position  : Matreshka.Internals.Utf16.Utf16_String_Index;
      Current_Length    : Natural;
      Current_State     :
        Matreshka.Internals.Unicode.Ucd.Grapheme_Cluster_Break;
      Next_Position     : Matreshka.Internals.Utf16.Utf16_String_Index;
      Next_State        :
        Matreshka.Internals.Unicode.Ucd.Grapheme_Cluster_Break;
   end record;

--   overriding procedure On_Changed
--    (Self          : not null access Grapheme_Cluster_Cursor;
--     Changed_First : Positive;
--     Removed_Last  : Natural;
--     Inserted_Last : Natural);

end League.Strings.Cursors.Grapheme_Clusters;
