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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             S I N P U T . P                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2012, 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.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

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

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

--                                                                          --

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

with Ada.Unchecked_Conversion;

with Ada.Unchecked_Deallocation;

with Prj.Err;

with Sinput.C;

with System;

package body Sinput.P is

   First : Boolean := True;

   --  Flag used when Load_Project_File is called the first time,

   --  to set Main_Source_File.

   --  The flag is reset to False at the first call to Load_Project_File.

   --  Calling Reset_First sets it back to True.

   procedure Free is new Ada.Unchecked_Deallocation

     (Lines_Table_Type, Lines_Table_Ptr);

   procedure Free is new Ada.Unchecked_Deallocation

     (Logical_Lines_Table_Type, Logical_Lines_Table_Ptr);

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

   -- Clear_Source_File_Table --

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

   procedure Clear_Source_File_Table is

      use System;

   begin

      for X in 1 .. Source_File.Last loop

         declare

            S  : Source_File_Record renames Source_File.Table (X);

            Lo : constant Source_Ptr := S.Source_First;

            Hi : constant Source_Ptr := S.Source_Last;

            subtype Actual_Source_Buffer is Source_Buffer (Lo .. Hi);

            --  Physical buffer allocated

            type Actual_Source_Ptr is access Actual_Source_Buffer;

            --  This is the pointer type for the physical buffer allocated

            procedure Free is new Ada.Unchecked_Deallocation

              (Actual_Source_Buffer, Actual_Source_Ptr);

            pragma Suppress (All_Checks);

            pragma Warnings (Off);

            --  The following unchecked conversion is aliased safe, since it

            --  is not used to create improperly aliased pointer values.

            function To_Actual_Source_Ptr is new

              Ada.Unchecked_Conversion (Address, Actual_Source_Ptr);

            pragma Warnings (On);

            Actual_Ptr : Actual_Source_Ptr :=

                           To_Actual_Source_Ptr (S.Source_Text (Lo)'Address);

         begin

            Free (Actual_Ptr);

            Free (S.Lines_Table);

            Free (S.Logical_Lines_Table);

         end;

      end loop;

      Source_File.Free;

      Sinput.Initialize;

   end Clear_Source_File_Table;

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

   -- Load_Project_File --

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

   function Load_Project_File (Path : String) return Source_File_Index is

      X : Source_File_Index;

   begin

      X := Sinput.C.Load_File (Path);

      if First then

         Main_Source_File := X;

         First := False;

      end if;

      return X;

   end Load_Project_File;

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

   -- Reset_First --

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

   procedure Reset_First is

   begin

      First := True;

   end Reset_First;

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

   -- Restore_Project_Scan_State --

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

   procedure Restore_Project_Scan_State

     (Saved_State : Saved_Project_Scan_State)

   is

   begin

      Restore_Scan_State (Saved_State.Scan_State);

      Source              := Saved_State.Source;

      Current_Source_File := Saved_State.Current_Source_File;

   end Restore_Project_Scan_State;

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

   -- Save_Project_Scan_State --

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

   procedure Save_Project_Scan_State

     (Saved_State : out Saved_Project_Scan_State)

   is

   begin

      Save_Scan_State (Saved_State.Scan_State);

      Saved_State.Source              := Source;

      Saved_State.Current_Source_File := Current_Source_File;

   end Save_Project_Scan_State;

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

   -- Source_File_Is_Subunit --

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

   function Source_File_Is_Subunit (X : Source_File_Index) return Boolean is

   begin

      --  Nothing to do if X is no source file, so simply return False

      if X = No_Source_File then

         return False;

      end if;

      Prj.Err.Scanner.Initialize_Scanner (X);

      --  No error for special characters that are used for preprocessing

      Prj.Err.Scanner.Set_Special_Character ('#');

      Prj.Err.Scanner.Set_Special_Character ('$');

      Check_For_BOM;

      --  We scan past junk to the first interesting compilation unit token, to

      --  see if it is SEPARATE. We ignore WITH keywords during this and also

      --  PRIVATE. The reason for ignoring PRIVATE is that it handles some

      --  error situations, and also to handle PRIVATE WITH in Ada 2005 mode.

      while Token = Tok_With

        or else Token = Tok_Private

        or else (Token not in Token_Class_Cunit and then Token /= Tok_EOF)

      loop

         Prj.Err.Scanner.Scan;

      end loop;

      Prj.Err.Scanner.Reset_Special_Characters;

      return Token = Tok_Separate;

   end Source_File_Is_Subunit;

end Sinput.P;