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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--      A D A . S T R I N G S . W I D E _ W I D E _ U N B O U N D E D       --

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--                                 S p e c                                  --

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--          Copyright (C) 1992-2011, Free Software Foundation, Inc.         --

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-- This specification is derived from the Ada Reference Manual for use with --

-- GNAT. The copyright notice above, and the license provisions that follow --

-- apply solely to the  contents of the part following the private keyword. --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

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-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

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-- You should have received a copy of the GNU General Public License and    --

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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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

--  This version is supported on:

--    - all Alpha platforms

--    - all ia64 platforms

--    - all PowerPC platforms

--    - all SPARC V9 platforms

--    - all x86 platforms

--    - all x86_64 platforms

with Ada.Strings.Wide_Wide_Maps;

private with Ada.Finalization;

private with System.Atomic_Counters;

package Ada.Strings.Wide_Wide_Unbounded is

   pragma Preelaborate;

   type Unbounded_Wide_Wide_String is private;

   pragma Preelaborable_Initialization (Unbounded_Wide_Wide_String);

   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 Set_Unbounded_Wide_Wide_String

     (Target : out Unbounded_Wide_Wide_String;

      Source : Wide_Wide_String);

   pragma Ada_05 (Set_Unbounded_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  : Unbounded_Wide_Wide_String;

      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 Unbounded_Slice

     (Source : Unbounded_Wide_Wide_String;

      Low    : Positive;

      High   : Natural) return Unbounded_Wide_Wide_String;

   pragma Ada_05 (Unbounded_Slice);

   procedure Unbounded_Slice

     (Source : Unbounded_Wide_Wide_String;

      Target : out Unbounded_Wide_Wide_String;

      Low    : Positive;

      High   : Natural);

   pragma Ada_05 (Unbounded_Slice);

   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

     (Source  : Unbounded_Wide_Wide_String;

      Pattern : Wide_Wide_String;

      From    : Positive;

      Going   : Direction := Forward;

      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping :=

                  Wide_Wide_Maps.Identity)

      return Natural;

   pragma Ada_05 (Index);

   function Index

     (Source  : Unbounded_Wide_Wide_String;

      Pattern : Wide_Wide_String;

      From    : Positive;

      Going   : Direction := Forward;

      Mapping : Wide_Wide_Maps.Wide_Wide_Character_Mapping_Function)

      return Natural;

   pragma Ada_05 (Index);

   function Index

     (Source  : Unbounded_Wide_Wide_String;

      Set     : Wide_Wide_Maps.Wide_Wide_Character_Set;

      From    : Positive;

      Test    : Membership := Inside;

      Going   : Direction := Forward) return Natural;

   pragma Ada_05 (Index);

   function Index_Non_Blank

     (Source : Unbounded_Wide_Wide_String;

      Going  : Direction := Forward) return Natural;

   function Index_Non_Blank

     (Source : Unbounded_Wide_Wide_String;

      From   : Positive;

      Going  : Direction := Forward) return Natural;

   pragma Ada_05 (Index_Non_Blank);

   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;

      From   : Positive;

      Test   : Membership;

      First  : out Positive;

      Last   : out Natural);

   pragma Ada_2012 (Find_Token);

   procedure Find_Token

     (Source : Unbounded_Wide_Wide_String;

      Set    : Wide_Wide_Maps.Wide_Wide_Character_Set;

      Test   : Membership;

      First  : out Positive;

      Last   : out Natural);

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

   -- 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);

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

   -- 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;

   type Shared_Wide_Wide_String (Max_Length : Natural) is limited record

      Counter : System.Atomic_Counters.Atomic_Counter;

      --  Reference counter

      Last : Natural := 0;

      Data : Wide_Wide_String (1 .. Max_Length);

      --  Last is the index of last significant element of the Data. All

      --  elements with larger indices are just an extra room.

   end record;

   type Shared_Wide_Wide_String_Access is access all Shared_Wide_Wide_String;

   procedure Reference (Item : not null Shared_Wide_Wide_String_Access);

   --  Increment reference counter.

   procedure Unreference (Item : not null Shared_Wide_Wide_String_Access);

   --  Decrement reference counter. Deallocate Item when reference counter is

   --  zero.

   function Can_Be_Reused

     (Item   : Shared_Wide_Wide_String_Access;

      Length : Natural) return Boolean;

   --  Returns True if Shared_Wide_Wide_String can be reused. There are two

   --  criteria when Shared_Wide_Wide_String can be reused: its reference

   --  counter must be one (thus Shared_Wide_Wide_String is owned exclusively)

   --  and its size is sufficient to store string with specified length

   --  effectively.

   function Allocate

     (Max_Length : Natural) return Shared_Wide_Wide_String_Access;

   --  Allocates new Shared_Wide_Wide_String with at least specified maximum

   --  length. Actual maximum length of the allocated Shared_Wide_Wide_String

   --  can be slightly greater. Returns reference to

   --  Empty_Shared_Wide_Wide_String when requested length is zero.

   Empty_Shared_Wide_Wide_String : aliased Shared_Wide_Wide_String (0);

   function To_Unbounded

     (S : Wide_Wide_String) return Unbounded_Wide_Wide_String

     renames To_Unbounded_Wide_Wide_String;

   --  This renames are here only to be used in the pragma Stream_Convert.

   type Unbounded_Wide_Wide_String is new AF.Controlled with record

      Reference : Shared_Wide_Wide_String_Access :=

                    Empty_Shared_Wide_Wide_String'Access;

   end record;

   --  The Unbounded_Wide_Wide_String uses several techniques to increase speed

   --  of the application:

   --   - implicit sharing or copy-on-write. Unbounded_Wide_Wide_String

   --     contains only the reference to the data which is shared between

   --     several instances. The shared data is reallocated only when its value

   --     is changed and the object mutation can't be used or it is inefficient

   --     to use it;

   --   - object mutation. Shared data object can be reused without memory

   --     reallocation when all of the following requirements are meat:

   --      - shared data object don't used anywhere longer;

   --      - its size is sufficient to store new value;

   --      - the gap after reuse is less then some threshold.

   --   - memory preallocation. Most of used memory allocation algorithms

   --     aligns allocated segment on the some boundary, thus some amount of

   --     additional memory can be preallocated without any impact. Such

   --     preallocated memory can used later by Append/Insert operations

   --     without reallocation.

   --  Reference counting uses GCC builtin atomic operations, which allows to

   --  safely share internal data between Ada tasks. Nevertheless, this not

   --  make objects of Unbounded_Wide_Wide_String thread-safe, so each instance

   --  can't be accessed by several tasks simultaneously.

   pragma Stream_Convert

     (Unbounded_Wide_Wide_String, To_Unbounded, To_Wide_Wide_String);

   --  Provide stream routines without dragging in Ada.Streams

   pragma Finalize_Storage_Only (Unbounded_Wide_Wide_String);

   --  Finalization is required only for freeing storage

   overriding procedure Initialize

     (Object : in out Unbounded_Wide_Wide_String);

   overriding procedure Adjust

     (Object : in out Unbounded_Wide_Wide_String);

   overriding procedure Finalize

     (Object : in out Unbounded_Wide_Wide_String);

   Null_Unbounded_Wide_Wide_String : constant Unbounded_Wide_Wide_String :=

                                       (AF.Controlled with

                                          Reference =>

                                            Empty_Shared_Wide_Wide_String'

                                              Access);

end Ada.Strings.Wide_Wide_Unbounded;