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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                         G N A T . R E G I S T R Y                        --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2001-2011, Free Software Foundation, Inc.         --

--                                                                          --

-- 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- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

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

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

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- 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.               --

--                                                                          --

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

-- a copy of the GCC Runtime Library Exception along with this program;     --

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

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

--                                                                          --

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

--                                                                          --

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

--  The registry is a Windows database to store key/value pair. It is used

--  to keep Windows operation system and applications configuration options.

--  The database is a hierarchal set of key and for each key a value can

--  be associated. This package provides high level routines to deal with

--  the Windows registry. For full registry API, but at a lower level of

--  abstraction, refer to the Win32.Winreg package provided with the

--  Win32Ada binding. For example this binding handle only key values of

--  type Standard.String.

--  This package is specific to the NT version of GNAT, and is not available

--  on any other platforms.

package GNAT.Registry is

   type HKEY is private;

   --  HKEY is a handle to a registry key, including standard registry keys:

   --  HKEY_CLASSES_ROOT, HKEY_CURRENT_CONFIG, HKEY_CURRENT_USER,

   --  HKEY_LOCAL_MACHINE, HKEY_USERS, HKEY_PERFORMANCE_DATA.

   HKEY_CLASSES_ROOT     : constant HKEY;

   HKEY_CURRENT_USER     : constant HKEY;

   HKEY_CURRENT_CONFIG   : constant HKEY;

   HKEY_LOCAL_MACHINE    : constant HKEY;

   HKEY_USERS            : constant HKEY;

   HKEY_PERFORMANCE_DATA : constant HKEY;

   type Key_Mode is (Read_Only, Read_Write);

   --  Access mode for the registry key

   Registry_Error : exception;

   --  Registry_Error is raises by all routines below if a problem occurs

   --  (key cannot be opened, key cannot be found etc).

   function Create_Key

     (From_Key : HKEY;

      Sub_Key  : String;

      Mode     : Key_Mode := Read_Write) return HKEY;

   --  Open or create a key (named Sub_Key) in the Windows registry database.

   --  The key will be created under key From_Key. It returns the key handle.

   --  From_Key must be a valid handle to an already opened key or one of

   --  the standard keys identified by HKEY declarations above.

   function Open_Key

     (From_Key : HKEY;

      Sub_Key  : String;

      Mode     : Key_Mode := Read_Only) return HKEY;

   --  Return a registry key handle for key named Sub_Key opened under key

   --  From_Key. It is possible to open a key at any level in the registry

   --  tree in a single call to Open_Key.

   procedure Close_Key (Key : HKEY);

   --  Close registry key handle. All resources used by Key are released

   function Key_Exists (From_Key : HKEY; Sub_Key : String) return Boolean;

   --  Returns True if Sub_Key is defined under From_Key in the registry

   function Query_Value

     (From_Key : HKEY;

      Sub_Key  : String;

      Expand   : Boolean := False) return String;

   --  Returns the registry key's value associated with Sub_Key in From_Key

   --  registry key. If Expand is set to True and the Sub_Key is a

   --  REG_EXPAND_SZ the returned value will have the %name% variables

   --  replaced by the corresponding environment variable value.

   procedure Set_Value

      (From_Key : HKEY;

       Sub_Key  : String;

       Value    : String;

       Expand   : Boolean := False);

   --  Add the pair (Sub_Key, Value) into From_Key registry key.

   --  By default the value created is of type REG_SZ, unless

   --  Expand is True in which case it is of type REG_EXPAND_SZ

   procedure Delete_Key (From_Key : HKEY; Sub_Key : String);

   --  Remove Sub_Key from the registry key From_Key

   procedure Delete_Value (From_Key : HKEY; Sub_Key : String);

   --  Remove the named value Sub_Key from the registry key From_Key

   generic

      with procedure Action

        (Index    : Positive;

         Key      : HKEY;

         Key_Name : String;

         Quit     : in out Boolean);

   procedure For_Every_Key (From_Key : HKEY; Recursive : Boolean := False);

   --  Iterates over all the keys registered under From_Key, recursively if

   --  Recursive is set to True. Index will be set to 1 for the first key and

   --  will be incremented by one in each iteration. The current key of an

   --  iteration is set in Key, and its name - in Key_Name. Quit can be set

   --  to True to stop iteration; its initial value is False.

   generic

      with procedure Action

        (Index   : Positive;

         Sub_Key : String;

         Value   : String;

         Quit    : in out Boolean);

   procedure For_Every_Key_Value (From_Key : HKEY; Expand : Boolean := False);

   --  Iterates over all the pairs (Sub_Key, Value) registered under

   --  From_Key. Index will be set to 1 for the first key and will be

   --  incremented by one in each iteration. Quit can be set to True to

   --  stop iteration; its initial value is False.

   --

   --  Key value that are not of type string (i.e. not REG_SZ / REG_EXPAND_SZ)

   --  are skipped. In this case, the iterator behaves exactly as if the key

   --  were not present. Note that you must use the Win32.Winreg API to deal

   --  with this case. Furthermore, if Expand is set to True and the Sub_Key

   --  is a REG_EXPAND_SZ the returned value will have the %name% variables

   --  replaced by the corresponding environment variable value.

   --

   --  This iterator can be used in conjunction with For_Every_Key in

   --  order to analyze all subkeys and values of a given registry key.

private

   type HKEY is mod 2 ** Standard'Address_Size;

   HKEY_CLASSES_ROOT     : constant HKEY := 16#80000000#;

   HKEY_CURRENT_USER     : constant HKEY := 16#80000001#;

   HKEY_LOCAL_MACHINE    : constant HKEY := 16#80000002#;

   HKEY_USERS            : constant HKEY := 16#80000003#;

   HKEY_PERFORMANCE_DATA : constant HKEY := 16#80000004#;

   HKEY_CURRENT_CONFIG   : constant HKEY := 16#80000005#;

end GNAT.Registry;