------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             S W I T C H - M                              --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 2001-2007, 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 Debug;    use Debug;
with Osint;    use Osint;
with Opt;      use Opt;
with Prj.Ext;  use Prj.Ext;
with Table;

package body Switch.M is

   package Normalized_Switches is new Table.Table
     (Table_Component_Type => String_Access,
      Table_Index_Type     => Integer,
      Table_Low_Bound      => 1,
      Table_Initial        => 20,
      Table_Increment      => 100,
      Table_Name           => "Switch.M.Normalized_Switches");
   --  This table is used to keep the normalized switches, so that they may be
   --  reused for subsequent invocations of Normalize_Compiler_Switches with
   --  similar switches.

   Initial_Number_Of_Switches : constant := 10;

   Global_Switches : Argument_List_Access := null;
   --  Used by function Normalize_Compiler_Switches

   ---------------------------------
   -- Normalize_Compiler_Switches --
   ---------------------------------

   procedure Normalize_Compiler_Switches
     (Switch_Chars : String;
      Switches     : in out Argument_List_Access;
      Last         : out Natural)
   is
      Switch_Starts_With_Gnat : Boolean;

      Ptr : Integer := Switch_Chars'First;
      Max : constant Integer := Switch_Chars'Last;
      C   : Character := ' ';

      Storing      : String := Switch_Chars;
      First_Stored : Positive := Ptr + 1;
      Last_Stored  : Positive := First_Stored;

      procedure Add_Switch_Component (S : String);
      --  Add a new String_Access component in Switches. If a string equal
      --  to S is already stored in the table Normalized_Switches, use it.
      --  Other wise add a new component to the table.

      --------------------------
      -- Add_Switch_Component --
      --------------------------

      procedure Add_Switch_Component (S : String) is
      begin
         --  If Switches is null, allocate a new array

         if Switches = null then
            Switches := new Argument_List (1 .. Initial_Number_Of_Switches);

         --  otherwise, if Switches is full, extend it

         elsif Last = Switches'Last then
            declare
               New_Switches : constant Argument_List_Access :=
                                new Argument_List
                                      (1 .. Switches'Length + Switches'Length);
            begin
               New_Switches (1 .. Switches'Length) := Switches.all;
               Last := Switches'Length;
               Switches := New_Switches;
            end;
         end if;

         --  If this is the first switch, Last designates the first component

         if Last = 0 then
            Last := Switches'First;
         else
            Last := Last + 1;
         end if;

         --  Look into the table Normalized_Switches for a similar string.
         --  If one is found, put it at the added component, and return.

         for Index in 1 .. Normalized_Switches.Last loop
            if S = Normalized_Switches.Table (Index).all then
               Switches (Last) := Normalized_Switches.Table (Index);
               return;
            end if;
         end loop;

         --  No string equal to S was found in the table Normalized_Switches.
         --  Add a new component in the table.

         Switches (Last) := new String'(S);
         Normalized_Switches.Append (Switches (Last));
      end Add_Switch_Component;

   --  Start of processing for Normalize_Compiler_Switches

   begin
      Last := 0;

      if Ptr = Max or else Switch_Chars (Ptr) /= '-' then
         return;
      end if;

      Ptr := Ptr + 1;

      Switch_Starts_With_Gnat :=
         Ptr + 3 <= Max and then Switch_Chars (Ptr .. Ptr + 3) = "gnat";

      if Switch_Starts_With_Gnat then
         Ptr := Ptr + 4;
         First_Stored := Ptr;
      end if;

      while Ptr <= Max loop
         C := Switch_Chars (Ptr);

         --  Processing for a switch

         case Switch_Starts_With_Gnat is

            when False =>

               --  All switches that don't start with -gnat stay as is,
               --  except -v, -E and -pg

               if Switch_Chars = "-pg" then

                  --  The gcc driver converts -pg to -p, so that is what
                  --  is stored in the ALI file.

                  Add_Switch_Component ("-p");

               --  Do not take into account switches that are not transmitted
               --  to gnat1 by the gcc driver.

               elsif C /= 'v' and then C /= 'E' then
                  Add_Switch_Component (Switch_Chars);
               end if;

               return;

            when True =>

               case C is

                  --  One-letter switches

                  when 'a' | 'A' | 'b' | 'c' | 'D' | 'E' | 'f' |
                    'F' | 'g' | 'h' | 'H' | 'k' | 'l' | 'L' | 'n' | 'N' |
                    'o' | 'O' | 'p' | 'P' | 'q' | 'Q' | 'r' | 's' | 't' |
                    'u' | 'U' | 'v' | 'x' | 'X' | 'Z' =>
                     Storing (First_Stored) := C;
                     Add_Switch_Component
                       (Storing (Storing'First .. First_Stored));
                     Ptr := Ptr + 1;

                  --  One-letter switches followed by a positive number

                  when 'm' | 'T' =>
                     Storing (First_Stored) := C;
                     Last_Stored := First_Stored;

                     loop
                        Ptr := Ptr + 1;
                        exit when Ptr > Max
                          or else Switch_Chars (Ptr) not in '0' .. '9';
                        Last_Stored := Last_Stored + 1;
                        Storing (Last_Stored) := Switch_Chars (Ptr);
                     end loop;

                     Add_Switch_Component
                       (Storing (Storing'First .. Last_Stored));

                  when 'd' =>
                     Storing (First_Stored) := 'd';

                     while Ptr < Max loop
                        Ptr := Ptr + 1;
                        C := Switch_Chars (Ptr);
                        exit when C = ASCII.NUL or else C = '/'
                          or else C = '-';

                        if C in '1' .. '9' or else
                           C in 'a' .. 'z' or else
                           C in 'A' .. 'Z'
                        then
                           Storing (First_Stored + 1) := C;
                           Add_Switch_Component
                             (Storing (Storing'First .. First_Stored + 1));

                        else
                           Last := 0;
                           return;
                        end if;
                     end loop;

                     return;

                  when 'e' =>

                     --  Only -gnateD and -gnatep= need storing in ALI file

                     Storing (First_Stored) := 'e';
                     Ptr := Ptr + 1;

                     if Ptr > Max
                       or else (Switch_Chars (Ptr) /= 'D'
                                  and then Switch_Chars (Ptr) /= 'p')
                     then
                        Last := 0;
                        return;
                     end if;

                     --  Processing for -gnateD

                     if Switch_Chars (Ptr) = 'D' then
                        Storing (First_Stored + 1 ..
                                 First_Stored + Max - Ptr + 1) :=
                          Switch_Chars (Ptr .. Max);
                        Add_Switch_Component
                          (Storing (Storing'First ..
                                      First_Stored + Max - Ptr + 1));

                     --  Processing for -gnatep=

                     else
                        Ptr := Ptr + 1;

                        if Ptr = Max then
                           Last := 0;
                           return;
                        end if;

                        if Switch_Chars (Ptr) = '=' then
                           Ptr := Ptr + 1;
                        end if;

                        --  To normalize, always put a '=' after -gnatep.
                        --  Because that could lengthen the switch string,
                        --  declare a local variable.

                        declare
                           To_Store : String (1 .. Max - Ptr + 9);
                        begin
                           To_Store (1 .. 8) := "-gnatep=";
                           To_Store (9 .. Max - Ptr + 9) :=
                             Switch_Chars (Ptr .. Max);
                           Add_Switch_Component (To_Store);
                        end;
                     end if;

                     return;

                  when 'i' =>
                     Storing (First_Stored) := 'i';

                     Ptr := Ptr + 1;

                     if Ptr > Max then
                        Last := 0;
                        return;
                     end if;

                     C := Switch_Chars (Ptr);

                     if C in '1' .. '5'
                       or else C = '8'
                       or else C = 'p'
                       or else C = 'f'
                       or else C = 'n'
                       or else C = 'w'
                     then
                        Storing (First_Stored + 1) := C;
                        Add_Switch_Component
                          (Storing (Storing'First .. First_Stored + 1));
                        Ptr := Ptr + 1;

                     else
                        Last := 0;
                        return;
                     end if;

                  --  -gnatR may be followed by '0', '1', '2' or '3',
                  --  then by 's'

                  when 'R' =>
                     Last_Stored := First_Stored;
                     Storing (Last_Stored) := 'R';
                     Ptr := Ptr + 1;

                     if Ptr <= Max
                       and then Switch_Chars (Ptr) in '0' .. '9'
                     then
                        C := Switch_Chars (Ptr);

                        if C in '4' .. '9' then
                           Last := 0;
                           return;

                        else
                           Last_Stored := Last_Stored + 1;
                           Storing (Last_Stored) := C;
                           Ptr := Ptr + 1;

                           if Ptr <= Max
                             and then Switch_Chars (Ptr) = 's' then
                              Last_Stored := Last_Stored + 1;
                              Storing (Last_Stored) := 's';
                              Ptr := Ptr + 1;
                           end if;
                        end if;
                     end if;

                     Add_Switch_Component
                       (Storing (Storing'First .. Last_Stored));

                  --  Multiple switches

                  when 'V' | 'w' | 'y' =>
                     Storing (First_Stored) := C;
                     Ptr := Ptr + 1;

                     if Ptr > Max then
                        if C = 'y' then
                           Add_Switch_Component
                             (Storing (Storing'First .. First_Stored));

                        else
                           Last := 0;
                           return;
                        end if;
                     end if;

                     while Ptr <= Max loop
                        C := Switch_Chars (Ptr);
                        Ptr := Ptr + 1;

                        --  -gnatyMxxx

                        if C = 'M' and then
                          Storing (First_Stored) = 'y'
                        then
                           Last_Stored := First_Stored + 1;
                           Storing (Last_Stored) := 'M';

                           while Ptr <= Max loop
                              C := Switch_Chars (Ptr);
                              exit when C not in '0' .. '9';
                              Last_Stored := Last_Stored + 1;
                              Storing (Last_Stored) := C;
                              Ptr := Ptr + 1;
                           end loop;

                           --  If there is no digit after -gnatyM,
                           --  the switch is invalid.

                           if Last_Stored = First_Stored + 1 then
                              Last := 0;
                              return;

                           else
                              Add_Switch_Component
                                (Storing (Storing'First .. Last_Stored));
                           end if;

                           --  All other switches are -gnatxx

                        else
                           Storing (First_Stored + 1) := C;
                           Add_Switch_Component
                             (Storing (Storing'First .. First_Stored + 1));
                        end if;
                     end loop;

                  --  -gnat95 -gnat05

                  when '0' | '9' =>
                     Last_Stored := First_Stored;
                     Storing (Last_Stored) := C;
                     Ptr := Ptr + 1;

                     if Ptr /= Max or else Switch_Chars (Ptr) /= '5' then

                        --  Invalid switch

                        Last := 0;
                        return;

                     else
                        Last_Stored := Last_Stored + 1;
                        Storing (Last_Stored) := '5';
                        Add_Switch_Component
                          (Storing (Storing'First .. Last_Stored));
                        Ptr := Ptr + 1;
                     end if;

                  --  -gnat83

                  when '8' =>
                     Last_Stored := First_Stored;
                     Storing (Last_Stored) := '8';
                     Ptr := Ptr + 1;

                     if Ptr /= Max or else Switch_Chars (Ptr) /= '3' then

                        --  Invalid switch

                        Last := 0;
                        return;

                     else
                        Last_Stored := Last_Stored + 1;
                        Storing (Last_Stored) := '3';
                        Add_Switch_Component
                          (Storing (Storing'First .. Last_Stored));
                        Ptr := Ptr + 1;
                     end if;

                  --  Not a valid switch

                  when others =>
                     Last := 0;
                     return;

               end case;

         end case;
      end loop;
   end Normalize_Compiler_Switches;

   function Normalize_Compiler_Switches
     (Switch_Chars : String)
      return         Argument_List
   is
      Last : Natural;

   begin
      Normalize_Compiler_Switches (Switch_Chars, Global_Switches, Last);

      if Last = 0 then
         return (1 .. 0 => null);
      else
         return Global_Switches (Global_Switches'First .. Last);
      end if;

   end Normalize_Compiler_Switches;

   ------------------------
   -- Scan_Make_Switches --
   ------------------------

   procedure Scan_Make_Switches
     (Switch_Chars : String;
      Success      : out Boolean)
   is
      Ptr : Integer          := Switch_Chars'First;
      Max : constant Integer := Switch_Chars'Last;
      C   : Character        := ' ';

   begin
      --  Assume a good switch

      Success := True;

      --  Skip past the initial character (must be the switch character)

      if Ptr = Max then
         Bad_Switch (Switch_Chars);

      else
         Ptr := Ptr + 1;
      end if;

      --  A little check, "gnat" at the start of a switch is for the compiler

      if Switch_Chars'Length >= Ptr + 3
        and then Switch_Chars (Ptr .. Ptr + 3) = "gnat"
      then
         Success := False;
         return;
      end if;

      C := Switch_Chars (Ptr);

      --  Multiple character switches

      if Switch_Chars'Length > 2 then
         if Switch_Chars = "--create-missing-dirs" then
            Setup_Projects := True;

         elsif Switch_Chars'Length > 3 and then
               Switch_Chars (Ptr .. Ptr + 1) = "aP"
         then
            Add_Search_Project_Directory
              (Switch_Chars (Ptr + 2 .. Switch_Chars'Last));

         elsif C = 'v' and then Switch_Chars'Length = 3 then
            Ptr := Ptr + 1;
            Verbose_Mode := True;

            case Switch_Chars (Ptr) is
               when 'l' =>
                  Verbosity_Level := Opt.Low;

               when 'm' =>
                  Verbosity_Level := Opt.Medium;

               when 'h' =>
                  Verbosity_Level := Opt.High;

               when others =>
                  Success := False;
            end case;

         elsif C = 'd' then

            --  Note: for the debug switch, the remaining characters in this
            --  switch field must all be debug flags, since all valid switch
            --  characters are also valid debug characters. This switch is not
            --  documented on purpose because it is only used by the
            --  implementors.

            --  Loop to scan out debug flags

            while Ptr < Max loop
               Ptr := Ptr + 1;
               C := Switch_Chars (Ptr);

               if C in 'a' .. 'z' or else C in 'A' .. 'Z' then
                  Set_Debug_Flag (C);
               else
                  Bad_Switch (Switch_Chars);
               end if;
            end loop;

         elsif C = 'e' then
            Ptr := Ptr + 1;

            case Switch_Chars (Ptr) is

               --  Processing for eI switch

               when 'I' =>
                  Ptr := Ptr + 1;
                  Scan_Pos (Switch_Chars, Max, Ptr, Main_Index, C);

                  if Ptr <= Max then
                     Bad_Switch (Switch_Chars);
                  end if;

               --  Processing for eL switch

               when 'L' =>
                  if Ptr /= Max then
                     Bad_Switch (Switch_Chars);

                  else
                     Follow_Links_For_Files := True;
                  end if;

               --  Processing for eS switch

               when 'S' =>
                  if Ptr /= Max then
                     Bad_Switch (Switch_Chars);

                  else
                     Commands_To_Stdout := True;
                  end if;

               when others =>
                  Bad_Switch (Switch_Chars);
            end case;

         elsif C = 'j' then
            Ptr := Ptr + 1;

            declare
               Max_Proc : Pos;
            begin
               Scan_Pos (Switch_Chars, Max, Ptr, Max_Proc, C);

               if Ptr <= Max then
                  Bad_Switch (Switch_Chars);

               else
                  Maximum_Processes := Positive (Max_Proc);
               end if;
            end;

         elsif C = 'w' and then Switch_Chars'Length = 3 then
            Ptr := Ptr + 1;

            if Switch_Chars = "-we" then
               Warning_Mode := Treat_As_Error;

            elsif Switch_Chars = "-wn" then
               Warning_Mode := Normal;

            elsif Switch_Chars = "-ws" then
               Warning_Mode  := Suppress;

            else
               Success := False;
            end if;

         else
            Success := False;
         end if;

      --  Single-character switches

      else
         Check_Switch : begin

            case C is

               when 'a' =>
                  Check_Readonly_Files := True;

               --  Processing for b switch

               when 'b' =>
                  Bind_Only  := True;
                  Make_Steps := True;

               --  Processing for B switch

               when 'B' =>
                  Build_Bind_And_Link_Full_Project := True;

               --  Processing for c switch

               when 'c' =>
                  Compile_Only := True;
                  Make_Steps   := True;

               --  Processing for C switch

               when 'C' =>
                  Create_Mapping_File := True;

               --  Processing for D switch

               when 'D' =>
                  if Object_Directory_Present then
                     Osint.Fail ("duplicate -D switch");

                  else
                     Object_Directory_Present := True;
                  end if;

               --  Processing for f switch

               when 'f' =>
                  Force_Compilations := True;

               --  Processing for F switch

               when 'F' =>
                  Full_Path_Name_For_Brief_Errors := True;

               --  Processing for h switch

               when 'h' =>
                  Usage_Requested := True;

               --  Processing for i switch

               when 'i' =>
                  In_Place_Mode := True;

               --  Processing for j switch

               when 'j' =>
                  --  -j not followed by a number is an error

                  Bad_Switch (Switch_Chars);

               --  Processing for k switch

               when 'k' =>
                  Keep_Going := True;

               --  Processing for l switch

               when 'l' =>
                  Link_Only  := True;
                  Make_Steps := True;

               --  Processing for M switch

               when 'M' =>
                  List_Dependencies := True;

               --  Processing for n switch

               when 'n' =>
                  Do_Not_Execute := True;

               --  Processing for o switch

               when 'o' =>
                  if Output_File_Name_Present then
                     Osint.Fail ("duplicate -o switch");
                  else
                     Output_File_Name_Present := True;
                  end if;

               --  Processing for p switch

               when 'p' =>
                  Setup_Projects := True;

               --  Processing for q switch

               when 'q' =>
                  Quiet_Output := True;

               --  Processing for R switch

               when 'R' =>
                  Run_Path_Option := False;

               --  Processing for s switch

               when 's' =>
                  Ptr := Ptr + 1;
                  Check_Switches := True;

               --  Processing for v switch

               when 'v' =>
                  Verbose_Mode := True;
                  Verbosity_Level := Opt.High;

                  --  Processing for x switch

               when 'x' =>
                  External_Unit_Compilation_Allowed := True;

                  --  Processing for z switch

               when 'z' =>
                  No_Main_Subprogram := True;

                  --  Any other small letter is an illegal switch

               when others =>
                  if C in 'a' .. 'z' then
                     Bad_Switch (Switch_Chars);

                  else
                     Success := False;
                  end if;

            end case;
         end Check_Switch;
      end if;
   end Scan_Make_Switches;

end Switch.M;
