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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             G N A T X R E F                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1998-2011, 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.  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 Opt;

with Osint;    use Osint;

with Types;    use Types;

with Switch;   use Switch;

with Xr_Tabls; use Xr_Tabls;

with Xref_Lib; use Xref_Lib;

with Ada.Strings.Fixed; use Ada.Strings.Fixed;

with Ada.Text_IO;       use Ada.Text_IO;

with GNAT.Command_Line; use GNAT.Command_Line;

with System.Strings;    use System.Strings;

procedure Gnatxref is

   Search_Unused   : Boolean := False;

   Local_Symbols   : Boolean := True;

   Prj_File        : File_Name_String;

   Prj_File_Length : Natural := 0;

   Usage_Error     : exception;

   Full_Path_Name  : Boolean := False;

   Vi_Mode         : Boolean := False;

   Read_Only       : Boolean := False;

   Have_File       : Boolean := False;

   Der_Info        : Boolean := False;

   RTS_Specified : String_Access := null;

   --  Used to detect multiple use of --RTS= switch

   EXT_Specified : String_Access := null;

   --  Used to detect multiple use of --ext= switch

   procedure Parse_Cmd_Line;

   --  Parse every switch on the command line

   procedure Usage;

   --  Display the usage

   procedure Write_Usage;

   --  Print a small help page for program usage

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

   -- Parse_Cmd_Line --

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

   procedure Parse_Cmd_Line is

      procedure Check_Version_And_Help is new Check_Version_And_Help_G (Usage);

      --  Start of processing for Parse_Cmd_Line

   begin

      --  First check for --version or --help

      Check_Version_And_Help ("GNATXREF", "1998");

      loop

         case

           GNAT.Command_Line.Getopt

             ("a aI: aO: d f g h I: nostdinc nostdlib p: u v -RTS= -ext=")

         is

            when ASCII.NUL =>

               exit;

            when 'a' =>

               if GNAT.Command_Line.Full_Switch = "a" then

                  Read_Only := True;

               elsif GNAT.Command_Line.Full_Switch = "aI" then

                  Osint.Add_Src_Search_Dir (GNAT.Command_Line.Parameter);

               else

                  Osint.Add_Lib_Search_Dir (GNAT.Command_Line.Parameter);

               end if;

            when 'd' =>

               Der_Info := True;

            when 'f' =>

               Full_Path_Name := True;

            when 'g' =>

               Local_Symbols := False;

            when 'h' =>

               Write_Usage;

            when 'I' =>

               Osint.Add_Src_Search_Dir (GNAT.Command_Line.Parameter);

               Osint.Add_Lib_Search_Dir (GNAT.Command_Line.Parameter);

            when 'n' =>

               if GNAT.Command_Line.Full_Switch = "nostdinc" then

                  Opt.No_Stdinc := True;

               elsif GNAT.Command_Line.Full_Switch = "nostdlib" then

                  Opt.No_Stdlib := True;

               end if;

            when 'p' =>

               declare

                  S : constant String := GNAT.Command_Line.Parameter;

               begin

                  Prj_File_Length := S'Length;

                  Prj_File (1 .. Prj_File_Length) := S;

               end;

            when 'u' =>

               Search_Unused := True;

               Vi_Mode := False;

            when 'v' =>

               Vi_Mode := True;

               Search_Unused := False;

            --  The only switch starting with -- recognized is --RTS

            when '-' =>

               --  Check that it is the first time we see this switch

               if Full_Switch = "-RTS" then

                  if RTS_Specified = null then

                     RTS_Specified := new String'(GNAT.Command_Line.Parameter);

                  elsif RTS_Specified.all /= GNAT.Command_Line.Parameter then

                     Osint.Fail ("--RTS cannot be specified multiple times");

                  end if;

                  Opt.No_Stdinc  := True;

                  Opt.RTS_Switch := True;

                  declare

                     Src_Path_Name : constant String_Ptr :=

                                       Get_RTS_Search_Dir

                                         (GNAT.Command_Line.Parameter,

                                          Include);

                     Lib_Path_Name : constant String_Ptr :=

                                       Get_RTS_Search_Dir

                                         (GNAT.Command_Line.Parameter,

                                          Objects);

                  begin

                     if Src_Path_Name /= null

                       and then Lib_Path_Name /= null

                     then

                        Add_Search_Dirs (Src_Path_Name, Include);

                        Add_Search_Dirs (Lib_Path_Name, Objects);

                     elsif Src_Path_Name = null

                       and then Lib_Path_Name = null

                     then

                        Osint.Fail ("RTS path not valid: missing " &

                                    "adainclude and adalib directories");

                     elsif Src_Path_Name = null then

                        Osint.Fail ("RTS path not valid: missing " &

                                    "adainclude directory");

                     elsif  Lib_Path_Name = null then

                        Osint.Fail ("RTS path not valid: missing " &

                                    "adalib directory");

                     end if;

                  end;

               elsif GNAT.Command_Line.Full_Switch = "-ext" then

                  --  Check that it is the first time we see this switch

                  if EXT_Specified = null then

                     EXT_Specified := new String'(GNAT.Command_Line.Parameter);

                  elsif EXT_Specified.all /= GNAT.Command_Line.Parameter then

                     Osint.Fail ("--ext cannot be specified multiple times");

                  end if;

                  if EXT_Specified'Length

                    = Osint.ALI_Default_Suffix'Length

                  then

                     Osint.ALI_Suffix := EXT_Specified.all'Access;

                  else

                     Osint.Fail ("--ext argument must have 3 characters");

                  end if;

               end if;

            when others =>

               Write_Usage;

         end case;

      end loop;

      --  Get the other arguments

      loop

         declare

            S : constant String := GNAT.Command_Line.Get_Argument;

         begin

            exit when S'Length = 0;

            if Ada.Strings.Fixed.Index (S, ":") /= 0 then

               Ada.Text_IO.Put_Line

                 ("Only file names are allowed on the command line");

               Write_Usage;

            end if;

            Add_Xref_File (S);

            Have_File := True;

         end;

      end loop;

   exception

      when GNAT.Command_Line.Invalid_Switch =>

         Ada.Text_IO.Put_Line ("Invalid switch : "

                               & GNAT.Command_Line.Full_Switch);

         Write_Usage;

      when GNAT.Command_Line.Invalid_Parameter =>

         Ada.Text_IO.Put_Line ("Parameter missing for : "

                               & GNAT.Command_Line.Full_Switch);

         Write_Usage;

   end Parse_Cmd_Line;

   -----------

   -- Usage --

   -----------

   procedure Usage is

   begin

      Put_Line ("Usage: gnatxref [switches] file1 file2 ...");

      New_Line;

      Put_Line ("  file ... list of source files to xref, " &

                "including with'ed units");

      New_Line;

      Put_Line ("gnatxref switches:");

      Display_Usage_Version_And_Help;

      Put_Line ("   -a        Consider all files, even when the ali file is"

                & " readonly");

      Put_Line ("   -aIdir    Specify source files search path");

      Put_Line ("   -aOdir    Specify library/object files search path");

      Put_Line ("   -d        Output derived type information");

      Put_Line ("   -f        Output full path name");

      Put_Line ("   -g        Output information only for global symbols");

      Put_Line ("   -Idir     Like -aIdir -aOdir");

      Put_Line ("   -nostdinc Don't look for sources in the system default"

                & " directory");

      Put_Line ("   -nostdlib Don't look for library files in the system"

                & " default directory");

      Put_Line ("   --ext=xxx Specify alternate ali file extension");

      Put_Line ("   --RTS=dir specify the default source and object search"

                & " path");

      Put_Line ("   -p file   Use file as the default project file");

      Put_Line ("   -u        List unused entities");

      Put_Line ("   -v        Print a 'tags' file for vi");

      New_Line;

   end Usage;

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

   -- Write_Usage --

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

   procedure Write_Usage is

   begin

      Display_Version ("GNATXREF", "1998");

      New_Line;

      Usage;

      raise Usage_Error;

   end Write_Usage;

begin

   Parse_Cmd_Line;

   if not Have_File then

      Write_Usage;

   end if;

   Xr_Tabls.Set_Default_Match (True);

   --  Find the project file

   if Prj_File_Length = 0 then

      Xr_Tabls.Create_Project_File

        (Default_Project_File (Osint.To_Host_Dir_Spec (".", False).all));

   else

      Xr_Tabls.Create_Project_File (Prj_File (1 .. Prj_File_Length));

   end if;

   --  Fill up the table

   Search_Xref (Local_Symbols, Read_Only, Der_Info);

   if Search_Unused then

      Print_Unused (Full_Path_Name);

   elsif Vi_Mode then

      Print_Vi (Full_Path_Name);

   else

      Print_Xref (Full_Path_Name);

   end if;

exception

   when Usage_Error =>

      null;

end Gnatxref;