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--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

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--           A D A . S T R I N G S . W I D E _ W I D E _ M A P S            --

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

with Ada.Finalization;

package Ada.Strings.Wide_Wide_Maps is

   pragma Preelaborate;

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

   -- Wide_Wide_Character Set Declarations --

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

   type Wide_Wide_Character_Set is private;

   pragma Preelaborable_Initialization (Wide_Wide_Character_Set);

   --  Representation for a set of Wide_Wide_Character values:

   Null_Set : constant Wide_Wide_Character_Set;

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

   -- Constructors for Wide_Wide_Character Sets --

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

   type Wide_Wide_Character_Range is record

      Low  : Wide_Wide_Character;

      High : Wide_Wide_Character;

   end record;

   --  Represents Wide_Wide_Character range Low .. High

   type Wide_Wide_Character_Ranges is

     array (Positive range <>) of Wide_Wide_Character_Range;

   function To_Set

     (Ranges : Wide_Wide_Character_Ranges) return Wide_Wide_Character_Set;

   function To_Set

     (Span : Wide_Wide_Character_Range) return Wide_Wide_Character_Set;

   function To_Ranges

     (Set : Wide_Wide_Character_Set) return Wide_Wide_Character_Ranges;

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

   -- Operations on Wide Character Sets --

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

   function "=" (Left, Right : Wide_Wide_Character_Set) return Boolean;

   function "not"

     (Right : Wide_Wide_Character_Set) return Wide_Wide_Character_Set;

   function "and"

     (Left, Right : Wide_Wide_Character_Set) return Wide_Wide_Character_Set;

   function "or"

     (Left, Right : Wide_Wide_Character_Set) return Wide_Wide_Character_Set;

   function "xor"

     (Left, Right : Wide_Wide_Character_Set) return Wide_Wide_Character_Set;

   function "-"

     (Left, Right : Wide_Wide_Character_Set) return Wide_Wide_Character_Set;

   function Is_In

     (Element : Wide_Wide_Character;

      Set     : Wide_Wide_Character_Set) return Boolean;

   function Is_Subset

     (Elements : Wide_Wide_Character_Set;

      Set      : Wide_Wide_Character_Set) return Boolean;

   function "<="

     (Left  : Wide_Wide_Character_Set;

      Right : Wide_Wide_Character_Set) return Boolean

   renames Is_Subset;

   subtype Wide_Wide_Character_Sequence is Wide_Wide_String;

   --  Alternative representation for a set of character values

   function To_Set

     (Sequence : Wide_Wide_Character_Sequence) return Wide_Wide_Character_Set;

   function To_Set

     (Singleton : Wide_Wide_Character) return Wide_Wide_Character_Set;

   function To_Sequence

     (Set : Wide_Wide_Character_Set) return Wide_Wide_Character_Sequence;

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

   -- Wide_Wide_Character Mapping Declarations --

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

   type Wide_Wide_Character_Mapping is private;

   pragma Preelaborable_Initialization (Wide_Wide_Character_Mapping);

   --  Representation for a wide character to wide character mapping:

   function Value

     (Map     : Wide_Wide_Character_Mapping;

      Element : Wide_Wide_Character) return Wide_Wide_Character;

   Identity : constant Wide_Wide_Character_Mapping;

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

   -- Operations on Wide Wide Mappings --

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

   function To_Mapping

     (From, To : Wide_Wide_Character_Sequence)

      return Wide_Wide_Character_Mapping;

   function To_Domain

     (Map : Wide_Wide_Character_Mapping) return Wide_Wide_Character_Sequence;

   function To_Range

     (Map : Wide_Wide_Character_Mapping) return Wide_Wide_Character_Sequence;

   type Wide_Wide_Character_Mapping_Function is

      access function (From : Wide_Wide_Character) return Wide_Wide_Character;

private

   package AF renames Ada.Finalization;

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

   -- Representation of Wide_Wide_Character_Set --

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

   --  A wide character set is represented as a sequence of wide character

   --  ranges (i.e. an object of type Wide_Wide_Character_Ranges) in which the

   --  following hold:

   --    The lower bound is 1

   --    The ranges are in order by increasing Low values

   --    The ranges are non-overlapping and discontigous

   --  A character value is in the set if it is contained in one of the

   --  ranges. The actual Wide_Wide_Character_Set value is a controlled pointer

   --  to this Wide_Wide_Character_Ranges value. The use of a controlled type

   --  is necessary to prevent storage leaks.

   type Wide_Wide_Character_Ranges_Access is

     access all Wide_Wide_Character_Ranges;

   type Wide_Wide_Character_Set is new AF.Controlled with record

      Set : Wide_Wide_Character_Ranges_Access;

   end record;

   pragma Finalize_Storage_Only (Wide_Wide_Character_Set);

   --  This avoids useless finalizations, and, more importantly avoids

   --  incorrect attempts to finalize constants that are statically

   --  declared here and in Ada.Strings.Wide_Wide_Maps, which is incorrect.

   procedure Initialize (Object : in out Wide_Wide_Character_Set);

   procedure Adjust     (Object : in out Wide_Wide_Character_Set);

   procedure Finalize   (Object : in out Wide_Wide_Character_Set);

   Null_Range : aliased constant Wide_Wide_Character_Ranges :=

                  (1 .. 0 => (Low => ' ', High => ' '));

   Null_Set : constant Wide_Wide_Character_Set :=

                (AF.Controlled with

                 Set => Null_Range'Unrestricted_Access);

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

   -- Representation of Wide_Wide_Character_Mapping --

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

   --  A wide character mapping is represented as two strings of equal

   --  length, where any character appearing in Domain is mapped to the

   --  corresponding character in Rangev. A character not appearing in

   --  Domain is mapped to itself. The characters in Domain are sorted

   --  in ascending order.

   --  The actual Wide_Wide_Character_Mapping value is a controlled record

   --  that contains a pointer to a discriminated record containing the

   --  range and domain values.

   --  Note: this representation is canonical, and the values stored in

   --  Domain and Rangev are exactly the values that are returned by the

   --  functions To_Domain and To_Range. The use of a controlled type is

   --  necessary to prevent storage leaks.

   type Wide_Wide_Character_Mapping_Values (Length : Natural) is record

      Domain : Wide_Wide_Character_Sequence (1 .. Length);

      Rangev : Wide_Wide_Character_Sequence (1 .. Length);

   end record;

   type Wide_Wide_Character_Mapping_Values_Access is

     access all Wide_Wide_Character_Mapping_Values;

   type Wide_Wide_Character_Mapping is new AF.Controlled with record

      Map : Wide_Wide_Character_Mapping_Values_Access;

   end record;

   pragma Finalize_Storage_Only (Wide_Wide_Character_Mapping);

   --  This avoids useless finalizations, and, more importantly avoids

   --  incorrect attempts to finalize constants that are statically

   --  declared here and in Ada.Strings.Wide_Wide_Maps, which is incorrect.

   procedure Initialize (Object : in out Wide_Wide_Character_Mapping);

   procedure Adjust     (Object : in out Wide_Wide_Character_Mapping);

   procedure Finalize   (Object : in out Wide_Wide_Character_Mapping);

   Null_Map : aliased constant Wide_Wide_Character_Mapping_Values :=

                 (Length => 0,

                  Domain => "",

                  Rangev => "");

   Identity : constant Wide_Wide_Character_Mapping :=

                (AF.Controlled with

                 Map => Null_Map'Unrestricted_Access);

end Ada.Strings.Wide_Wide_Maps;