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

--                                                                          --

--                          GNAT SYSTEM UTILITIES                           --

--                                                                          --

--                             X S N A M E S T                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009, 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.      --

--                                                                          --

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

--  This utility is used to make a new version of the Snames package when new

--  names are added. This version reads a template file from snames.ads-tmpl in

--  which the numbers are all written as $, and generates a new version of the

--  spec file snames.ads (written to snames.ns). It also reads snames.adb-tmpl

--  and generates an updated body (written to snames.nb), and snames.h-tmpl and

--  generates an updated C header file (written to snames.nh).

with Ada.Strings.Unbounded;         use Ada.Strings.Unbounded;

with Ada.Strings.Unbounded.Text_IO; use Ada.Strings.Unbounded.Text_IO;

with Ada.Strings.Maps;              use Ada.Strings.Maps;

with Ada.Strings.Maps.Constants;    use Ada.Strings.Maps.Constants;

with Ada.Text_IO;                   use Ada.Text_IO;

with Ada.Streams.Stream_IO;         use Ada.Streams.Stream_IO;

with GNAT.Spitbol;                  use GNAT.Spitbol;

with GNAT.Spitbol.Patterns;         use GNAT.Spitbol.Patterns;

with XUtil;                         use XUtil;

procedure XSnamesT is

   subtype VString is GNAT.Spitbol.VString;

   InS  : Ada.Text_IO.File_Type;

   InB  : Ada.Text_IO.File_Type;

   InH  : Ada.Text_IO.File_Type;

   OutS : Ada.Streams.Stream_IO.File_Type;

   OutB : Ada.Streams.Stream_IO.File_Type;

   OutH : Ada.Streams.Stream_IO.File_Type;

   A, B  : VString := Nul;

   Line  : VString := Nul;

   Name0 : VString := Nul;

   Name1 : VString := Nul;

   Oval  : VString := Nul;

   Restl : VString := Nul;

   Name_Ref : constant Pattern := Span (' ') * A & Break (' ') * Name0

                                  & Span (' ') * B

                                  & ": constant Name_Id := N + $;"

                                  & Rest * Restl;

   Get_Name : constant Pattern := "Name_" & Rest * Name1;

   Chk_Low  : constant Pattern := Pos (0) & Any (Lower_Set) & Rest & Pos (1);

   Findu    : constant Pattern := Span ('u') * A;

   Val : Natural;

   Xlate_U_Und : constant Character_Mapping := To_Mapping ("u", "_");

   M : Match_Result;

   type Header_Symbol is (None, Name, Attr, Conv, Prag);

   --  A symbol in the header file

   procedure Output_Header_Line (S : Header_Symbol);

   --  Output header line

   Header_Name : aliased String := "Name";

   Header_Attr : aliased String := "Attr";

   Header_Conv : aliased String := "Convention";

   Header_Prag : aliased String := "Pragma";

   --  Prefixes used in the header file

   type String_Ptr is access all String;

   Header_Prefix : constant array (Header_Symbol) of String_Ptr :=

                     (null,

                      Header_Name'Access,

                      Header_Attr'Access,

                      Header_Conv'Access,

                      Header_Prag'Access);

   --  Patterns used in the spec file

   Get_Attr : constant Pattern := Span (' ') & "Attribute_"

                                  & Break (",)") * Name1;

   Get_Conv : constant Pattern := Span (' ') & "Convention_"

                                  & Break (",)") * Name1;

   Get_Prag : constant Pattern := Span (' ') & "Pragma_"

                                  & Break (",)") * Name1;

   type Header_Symbol_Counter is array (Header_Symbol) of Natural;

   Header_Counter : Header_Symbol_Counter := (0, 0, 0, 0, 0);

   Header_Current_Symbol : Header_Symbol := None;

   Header_Pending_Line : VString := Nul;

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

   -- Output_Header_Line --

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

   procedure Output_Header_Line (S : Header_Symbol) is

      function Make_Value (V : Integer) return String;

      --  Build the definition for the current macro (Names are integers

      --  offset to N, while other items are enumeration values).

      function Make_Value (V : Integer) return String is

      begin

         if S = Name then

            return "(First_Name_Id + 256 + " & V & ")";

         else

            return "" & V;

         end if;

      end Make_Value;

   begin

      --  Skip all the #define for S-prefixed symbols in the header.

      --  Of course we are making implicit assumptions:

      --   (1) No newline between symbols with the same prefix.

      --   (2) Prefix order is the same as in snames.ads.

      if Header_Current_Symbol /= S then

         declare

            Name2 : VString;

            Pat : constant Pattern := "#define  "

                                       & Header_Prefix (S).all

                                       & Break (' ') * Name2;

            In_Pat : Boolean := False;

         begin

            if Header_Current_Symbol /= None then

               Put_Line (OutH, Header_Pending_Line);

            end if;

            loop

               Line := Get_Line (InH);

               if Match (Line, Pat) then

                  In_Pat := True;

               elsif In_Pat then

                  Header_Pending_Line := Line;

                  exit;

               else

                  Put_Line (OutH, Line);

               end if;

            end loop;

            Header_Current_Symbol := S;

         end;

      end if;

      --  Now output the line

      --  Note that we must ensure at least one space between macro name and

      --  parens, otherwise the parenthesized value gets treated as an argument

      --  specification.

      Put_Line (OutH, "#define  " & Header_Prefix (S).all

                  & "_" & Name1

                  & (30 - Natural'Min (29, Length (Name1))) * ' '

                  & Make_Value (Header_Counter (S)));

      Header_Counter (S) := Header_Counter (S) + 1;

   end Output_Header_Line;

--  Start of processing for XSnames

begin

   Open (InS, In_File, "snames.ads-tmpl");

   Open (InB, In_File, "snames.adb-tmpl");

   Open (InH, In_File, "snames.h-tmpl");

   --  Note that we do not generate snames.{ads,adb,h} directly. Instead

   --  we output them to snames.n{s,b,h} so that Makefiles can use

   --  move-if-change to not touch previously generated files if the

   --  new ones are identical.

   Create (OutS, Out_File, "snames.ns");

   Create (OutB, Out_File, "snames.nb");

   Create (OutH, Out_File, "snames.nh");

   Anchored_Mode := True;

   Val := 0;

   loop

      Line := Get_Line (InB);

      exit when Match (Line, "   Preset_Names");

      Put_Line (OutB, Line);

   end loop;

   Put_Line (OutB, Line);

   LoopN : while not End_Of_File (InS) loop

      Line := Get_Line (InS);

      if not Match (Line, Name_Ref) then

         Put_Line (OutS, Line);

         if Match (Line, Get_Attr) then

            Output_Header_Line (Attr);

         elsif Match (Line, Get_Conv) then

            Output_Header_Line (Conv);

         elsif Match (Line, Get_Prag) then

            Output_Header_Line (Prag);

         end if;

      else

         Oval := Lpad (V (Val), 3, '0');

         if Match (Name0, "Last_") then

            Oval := Lpad (V (Val - 1), 3, '0');

         end if;

         Put_Line

           (OutS, A & Name0 & B & ": constant Name_Id := N + "

            & Oval & ';' & Restl);

         if Match (Name0, Get_Name) then

            Name0 := Name1;

            Val   := Val + 1;

            if Match (Name0, Findu, M) then

               Replace (M, Translate (A, Xlate_U_Und));

               Translate (Name0, Lower_Case_Map);

            elsif not Match (Name0, "Op_", "") then

               Translate (Name0, Lower_Case_Map);

            else

               Name0 := 'O' & Translate (Name0, Lower_Case_Map);

            end if;

            if Name0 = "error" then

               Name0 := V ("<error>");

            end if;

            if not Match (Name0, Chk_Low) then

               Put_Line (OutB, "     """ & Name0 & "#"" &");

            end if;

            Output_Header_Line (Name);

         end if;

      end if;

   end loop LoopN;

   loop

      Line := Get_Line (InB);

      exit when Match (Line, "     ""#"";");

   end loop;

   Put_Line (OutB, Line);

   while not End_Of_File (InB) loop

      Line := Get_Line (InB);

      Put_Line (OutB, Line);

   end loop;

   Put_Line (OutH, Header_Pending_Line);

   while not End_Of_File (InH) loop

      Line := Get_Line (InH);

      Put_Line (OutH, Line);

   end loop;

end XSnamesT;