------------------------------------------------------------------------------
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------------------------------------------------------------------------------

with Ada.Strings.Wide_Wide_Maps;
with Ada.Finalization;

package Ada.Strings.Wide_Wide_Unbounded is
pragma Preelaborate (Wide_Wide_Unbounded);

   type Unbounded_Wide_Wide_String is private;

   Null_Unbounded_Wide_Wide_String : constant Unbounded_Wide_Wide_String;

   function Length (Source : Unbounded_Wide_Wide_String) return Natural;

   type Wide_Wide_String_Access is access all Wide_Wide_String;

   procedure Free (X : in out Wide_Wide_String_Access);

   --------------------------------------------------------
   -- Conversion, Concatenation, and Selection Functions --
   --------------------------------------------------------

   function To_Unbounded_Wide_Wide_String
     (Source : Wide_Wide_String) return Unbounded_Wide_Wide_String;

   function To_Unbounded_Wide_Wide_String
     (Length : Natural) return Unbounded_Wide_Wide_String;

   function To_Wide_Wide_String
     (Source : Unbounded_Wide_Wide_String) return Wide_Wide_String;

   procedure Append
     (Source   : in out Unbounded_Wide_Wide_String;
      New_Item : Unbounded_Wide_Wide_String);

   procedure Append
     (Source   : in out Unbounded_Wide_Wide_String;
      New_Item : Wide_Wide_String);

   procedure Append
     (Source   : in out Unbounded_Wide_Wide_String;
      New_Item : Wide_Wide_Character);

   function "&"
     (Left, Right : Unbounded_Wide_Wide_String)
     return Unbounded_Wide_Wide_String;

   function "&"
     (Left  : Unbounded_Wide_Wide_String;
      Right : Wide_Wide_String) return Unbounded_Wide_Wide_String;

   function "&"
     (Left  : Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Unbounded_Wide_Wide_String;

   function "&"
     (Left  : Unbounded_Wide_Wide_String;
      Right : Wide_Wide_Character) return Unbounded_Wide_Wide_String;

   function "&"
     (Left  : Wide_Wide_Character;
      Right : Unbounded_Wide_Wide_String) return Unbounded_Wide_Wide_String;

   function Element
     (Source : Unbounded_Wide_Wide_String;
      Index  : Positive) return Wide_Wide_Character;

   procedure Replace_Element
     (Source : in out Unbounded_Wide_Wide_String;
      Index  : Positive;
      By     : Wide_Wide_Character);

   function Slice
     (Source : Unbounded_Wide_Wide_String;
      Low    : Positive;
      High   : Natural) return Wide_Wide_String;

   function "="
     (Left  : Unbounded_Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function "="
     (Left  : Unbounded_Wide_Wide_String;
      Right : Wide_Wide_String) return Boolean;

   function "="
     (Left  : Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function "<"
     (Left  : Unbounded_Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function "<"
     (Left  : Unbounded_Wide_Wide_String;
      Right : Wide_Wide_String) return Boolean;

   function "<"
     (Left  : Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function "<="
     (Left  : Unbounded_Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function "<="
     (Left  : Unbounded_Wide_Wide_String;
      Right : Wide_Wide_String) return Boolean;

   function "<="
     (Left  : Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function ">"
     (Left  : Unbounded_Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function ">"
     (Left  : Unbounded_Wide_Wide_String;
      Right : Wide_Wide_String) return Boolean;

   function ">"
     (Left  : Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function ">="
     (Left  : Unbounded_Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   function ">="
     (Left  : Unbounded_Wide_Wide_String;
      Right : Wide_Wide_String) return Boolean;

   function ">="
     (Left  : Wide_Wide_String;
      Right : Unbounded_Wide_Wide_String) return Boolean;

   ------------------------
   -- Search Subprograms --
   ------------------------

   function Index
     (Source  : Unbounded_Wide_Wide_String;
      Pattern : Wide_Wide_String;
      Going   : Direction := Forward;
      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping :=
                   Wide_Wide_Maps.Identity) return Natural;

   function Index
     (Source  : Unbounded_Wide_Wide_String;
      Pattern : Wide_Wide_String;
      Going   : Direction := Forward;
      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping_Function)
      return Natural;

   function Index
     (Source : Unbounded_Wide_Wide_String;
      Set    : Wide_Wide_Maps.Wide_Wide_Character_Set;
      Test   : Membership := Inside;
      Going  : Direction  := Forward) return Natural;

   function Index_Non_Blank
     (Source : Unbounded_Wide_Wide_String;
      Going  : Direction := Forward) return Natural;

   function Count
     (Source  : Unbounded_Wide_Wide_String;
      Pattern : Wide_Wide_String;
      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping :=
                  Wide_Wide_Maps.Identity) return Natural;

   function Count
     (Source  : Unbounded_Wide_Wide_String;
      Pattern : Wide_Wide_String;
      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping_Function)
      return Natural;

   function Count
     (Source : Unbounded_Wide_Wide_String;
      Set    : Wide_Wide_Maps.Wide_Wide_Character_Set) return Natural;

   procedure Find_Token
     (Source : Unbounded_Wide_Wide_String;
      Set    : Wide_Wide_Maps.Wide_Wide_Character_Set;
      Test   : Membership;
      First  : out Positive;
      Last   : out Natural);

   ------------------------------------
   -- Wide_Wide_String Translation Subprograms --
   ------------------------------------

   function Translate
     (Source  : Unbounded_Wide_Wide_String;
      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping)
      return Unbounded_Wide_Wide_String;

   procedure Translate
     (Source  : in out Unbounded_Wide_Wide_String;
      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping);

   function Translate
     (Source  : Unbounded_Wide_Wide_String;
      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping_Function)
      return Unbounded_Wide_Wide_String;

   procedure Translate
     (Source  : in out Unbounded_Wide_Wide_String;
      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping_Function);

   ---------------------------------------
   -- Wide_Wide_String Transformation Subprograms --
   ---------------------------------------

   function Replace_Slice
     (Source : Unbounded_Wide_Wide_String;
      Low    : Positive;
      High   : Natural;
      By     : Wide_Wide_String) return Unbounded_Wide_Wide_String;

   procedure Replace_Slice
     (Source   : in out Unbounded_Wide_Wide_String;
      Low      : Positive;
      High     : Natural;
      By       : Wide_Wide_String);

   function Insert
     (Source   : Unbounded_Wide_Wide_String;
      Before   : Positive;
      New_Item : Wide_Wide_String) return Unbounded_Wide_Wide_String;

   procedure Insert
     (Source   : in out Unbounded_Wide_Wide_String;
      Before   : Positive;
      New_Item : Wide_Wide_String);

   function Overwrite
     (Source   : Unbounded_Wide_Wide_String;
      Position : Positive;
      New_Item : Wide_Wide_String) return Unbounded_Wide_Wide_String;

   procedure Overwrite
     (Source    : in out Unbounded_Wide_Wide_String;
      Position  : Positive;
      New_Item  : Wide_Wide_String);

   function Delete
     (Source  : Unbounded_Wide_Wide_String;
      From    : Positive;
      Through : Natural) return Unbounded_Wide_Wide_String;

   procedure Delete
     (Source  : in out Unbounded_Wide_Wide_String;
      From    : Positive;
      Through : Natural);

   function Trim
     (Source : Unbounded_Wide_Wide_String;
      Side   : Trim_End) return Unbounded_Wide_Wide_String;

   procedure Trim
     (Source : in out Unbounded_Wide_Wide_String;
      Side   : Trim_End);

   function Trim
     (Source : Unbounded_Wide_Wide_String;
      Left   : Wide_Wide_Maps.Wide_Wide_Character_Set;
      Right  : Wide_Wide_Maps.Wide_Wide_Character_Set)
      return Unbounded_Wide_Wide_String;

   procedure Trim
     (Source : in out Unbounded_Wide_Wide_String;
      Left   : Wide_Wide_Maps.Wide_Wide_Character_Set;
      Right  : Wide_Wide_Maps.Wide_Wide_Character_Set);

   function Head
     (Source : Unbounded_Wide_Wide_String;
      Count  : Natural;
      Pad    : Wide_Wide_Character := Wide_Wide_Space)
      return Unbounded_Wide_Wide_String;

   procedure Head
     (Source : in out Unbounded_Wide_Wide_String;
      Count  : Natural;
      Pad    : Wide_Wide_Character := Wide_Wide_Space);

   function Tail
     (Source : Unbounded_Wide_Wide_String;
      Count  : Natural;
      Pad    : Wide_Wide_Character := Wide_Wide_Space)
      return Unbounded_Wide_Wide_String;

   procedure Tail
     (Source : in out Unbounded_Wide_Wide_String;
      Count  : Natural;
      Pad    : Wide_Wide_Character := Wide_Wide_Space);

   function "*"
     (Left  : Natural;
      Right : Wide_Wide_Character) return Unbounded_Wide_Wide_String;

   function "*"
     (Left  : Natural;
      Right : Wide_Wide_String) return Unbounded_Wide_Wide_String;

   function "*"
     (Left  : Natural;
      Right : Unbounded_Wide_Wide_String) return Unbounded_Wide_Wide_String;

private
   pragma Inline (Length);

   package AF renames Ada.Finalization;

   Null_Wide_Wide_String : aliased Wide_Wide_String := "";

   function To_Unbounded_Wide
     (S : Wide_Wide_String) return Unbounded_Wide_Wide_String
      renames To_Unbounded_Wide_Wide_String;

   type Unbounded_Wide_Wide_String is new AF.Controlled with record
      Reference : Wide_Wide_String_Access := Null_Wide_Wide_String'Access;
      Last      : Natural := 0;
   end record;

   --  The Unbounded_Wide_Wide_String is using a buffered implementation to
   --  increase speed of the Append/Delete/Insert procedures. The Reference
   --  string pointer above contains the current string value and extra room
   --  at the end to be used by the next Append routine. Last is the index of
   --  the string ending character. So the current string value is really
   --  Reference (1 .. Last).

   pragma Stream_Convert
     (Unbounded_Wide_Wide_String, To_Unbounded_Wide, To_Wide_Wide_String);

   pragma Finalize_Storage_Only (Unbounded_Wide_Wide_String);

   procedure Initialize (Object : in out Unbounded_Wide_Wide_String);
   procedure Adjust     (Object : in out Unbounded_Wide_Wide_String);
   procedure Finalize   (Object : in out Unbounded_Wide_Wide_String);

   Null_Unbounded_Wide_Wide_String : constant Unbounded_Wide_Wide_String :=
     (AF.Controlled with Reference => Null_Wide_Wide_String'Access, Last => 0);

end Ada.Strings.Wide_Wide_Unbounded;