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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             F N A M E . U F                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2011, 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 Alloc;

with Debug;    use Debug;

with Fmap;     use Fmap;

with Krunch;

with Opt;      use Opt;

with Osint;    use Osint;

with Table;

with Targparm; use Targparm;

with Uname;    use Uname;

with Widechar; use Widechar;

with GNAT.HTable;

package body Fname.UF is

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

   -- Declarations for Handling Source_File_Name pragmas --

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

   type SFN_Entry is record

      U     : Unit_Name_Type; -- Unit name

      F     : File_Name_Type; -- Spec/Body file name

      Index : Nat;            -- Index from SFN pragma (0 if none)

   end record;

   --  Record single Unit_Name type call to Set_File_Name

   package SFN_Table is new Table.Table (

     Table_Component_Type => SFN_Entry,

     Table_Index_Type     => Int,

     Table_Low_Bound      => 0,

     Table_Initial        => Alloc.SFN_Table_Initial,

     Table_Increment      => Alloc.SFN_Table_Increment,

     Table_Name           => "SFN_Table");

   --  Table recording all Unit_Name calls to Set_File_Name

   type SFN_Header_Num is range 0 .. 100;

   function SFN_Hash (F : Unit_Name_Type) return SFN_Header_Num;

   --  Compute hash index for use by Simple_HTable

   No_Entry : constant Int := -1;

   --  Signals no entry in following table

   package SFN_HTable is new GNAT.HTable.Simple_HTable (

     Header_Num => SFN_Header_Num,

     Element    => Int,

     No_Element => No_Entry,

     Key        => Unit_Name_Type,

     Hash       => SFN_Hash,

     Equal      => "=");

   --  Hash table allowing rapid access to SFN_Table, the element value is an

   --  index into this table.

   type SFN_Pattern_Entry is record

      Pat : String_Ptr;   -- File name pattern (with asterisk in it)

      Typ : Character;    -- 'S'/'B'/'U' for spec/body/subunit

      Dot : String_Ptr;   -- Dot_Separator string

      Cas : Casing_Type;  -- Upper/Lower/Mixed

   end record;

   --  Records single call to Set_File_Name_Patterm

   package SFN_Patterns is new Table.Table (

     Table_Component_Type => SFN_Pattern_Entry,

     Table_Index_Type     => Int,

     Table_Low_Bound      => 1,

     Table_Initial        => 10,

     Table_Increment      => 100,

     Table_Name           => "SFN_Patterns");

   --  Table recording calls to Set_File_Name_Pattern. Note that the first two

   --  entries are set to represent the standard GNAT rules for file naming.

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

   -- File_Name_Of_Body --

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

   function File_Name_Of_Body (Name : Name_Id) return File_Name_Type is

   begin

      Get_Name_String (Name);

      Name_Buffer (Name_Len + 1 .. Name_Len + 2) := "%b";

      Name_Len := Name_Len + 2;

      return Get_File_Name (Name_Enter, Subunit => False);

   end File_Name_Of_Body;

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

   -- File_Name_Of_Spec --

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

   function File_Name_Of_Spec (Name : Name_Id) return File_Name_Type is

   begin

      Get_Name_String (Name);

      Name_Buffer (Name_Len + 1 .. Name_Len + 2) := "%s";

      Name_Len := Name_Len + 2;

      return Get_File_Name (Name_Enter, Subunit => False);

   end File_Name_Of_Spec;

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

   -- Get_Expected_Unit_Type --

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

   function Get_Expected_Unit_Type

     (Fname : File_Name_Type) return Expected_Unit_Type

   is

   begin

      --  In syntax checking only mode or in multiple unit per file mode, there

      --  can be more than one unit in a file, so the file name is not a useful

      --  guide to the nature of the unit.

      if Operating_Mode = Check_Syntax

        or else Multiple_Unit_Index /= 0

      then

         return Unknown;

      end if;

      --  Search the file mapping table, if we find an entry for this file we

      --  know whether it is a spec or a body.

      for J in SFN_Table.First .. SFN_Table.Last loop

         if Fname = SFN_Table.Table (J).F then

            if Is_Body_Name (SFN_Table.Table (J).U) then

               return Expect_Body;

            else

               return Expect_Spec;

            end if;

         end if;

      end loop;

      --  If no entry in file naming table, assume .ads/.adb for spec/body and

      --  return unknown if we have neither of these two cases.

      Get_Name_String (Fname);

      if Name_Len > 4 then

         if Name_Buffer (Name_Len - 3 .. Name_Len) = ".ads" then

            return Expect_Spec;

         elsif Name_Buffer (Name_Len - 3 .. Name_Len) = ".adb" then

            return Expect_Body;

         end if;

      end if;

      return Unknown;

   end Get_Expected_Unit_Type;

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

   -- Get_File_Name --

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

   function Get_File_Name

     (Uname    : Unit_Name_Type;

      Subunit  : Boolean;

      May_Fail : Boolean := False) return File_Name_Type

   is

      Unit_Char : Character;

      --  Set to 's' or 'b' for spec or body or to 'u' for a subunit

      Unit_Char_Search : Character;

      --  Same as Unit_Char, except that in the case of 'u' for a subunit, we

      --  set Unit_Char_Search to 'b' if we do not find a subunit match.

      N : Int;

      Pname : File_Name_Type := No_File;

      Fname : File_Name_Type := No_File;

      --  Path name and File name for mapping

   begin

      --  Null or error name means that some previous error occurred. This is

      --  an unrecoverable error, so signal it.

      if Uname in Error_Unit_Name_Or_No_Unit_Name then

         raise Unrecoverable_Error;

      end if;

      --  Look in the map from unit names to file names

      Fname := Mapped_File_Name (Uname);

      --  If the unit name is already mapped, return the corresponding file

      --  name from the map.

      if Fname /= No_File then

         return Fname;

      end if;

      --  If there is a specific SFN pragma, return the corresponding file name

      N := SFN_HTable.Get (Uname);

      if N /= No_Entry then

         return SFN_Table.Table (N).F;

      end if;

      --  Here for the case where the name was not found in the table

      Get_Decoded_Name_String (Uname);

      --  A special fudge, normally we don't have operator symbols present,

      --  since it is always an error to do so. However, if we do, at this

      --  stage it has a leading double quote.

      --  What we do in this case is to go back to the undecoded name, which

      --  is of the form, for example:

      --    Oand%s

      --  and build a file name that looks like:

      --    _and_.ads

      --  which is bit peculiar, but we keep it that way. This means that we

      --  avoid bombs due to writing a bad file name, and w get expected error

      --  processing downstream, e.g. a compilation following gnatchop.

      if Name_Buffer (1) = '"' then

         Get_Name_String (Uname);

         Name_Len := Name_Len + 1;

         Name_Buffer (Name_Len)     := Name_Buffer (Name_Len - 1);

         Name_Buffer (Name_Len - 1) := Name_Buffer (Name_Len - 2);

         Name_Buffer (Name_Len - 2) := '_';

         Name_Buffer (1)            := '_';

      end if;

      --  Deal with spec or body suffix

      Unit_Char := Name_Buffer (Name_Len);

      pragma Assert (Unit_Char = 'b' or else Unit_Char = 's');

      pragma Assert (Name_Len >= 3 and then Name_Buffer (Name_Len - 1) = '%');

      Name_Len := Name_Len - 2;

      if Subunit then

         Unit_Char := 'u';

      end if;

      --  Now we need to find the proper translation of the name

      declare

         Uname : constant String (1 .. Name_Len) :=

                   Name_Buffer (1 .. Name_Len);

         Pent : Nat;

         Plen : Natural;

         Fnam : File_Name_Type := No_File;

         J    : Natural;

         Dot  : String_Ptr;

         Dotl : Natural;

         Is_Predef : Boolean;

         --  Set True for predefined file

         function C (N : Natural) return Character;

         --  Return N'th character of pattern

         function C (N : Natural) return Character is

         begin

            return SFN_Patterns.Table (Pent).Pat (N);

         end C;

      --  Start of search through pattern table

      begin

         --  Search pattern table to find a matching entry. In the general case

         --  we do two complete searches. The first time through we stop only

         --  if a matching file is found, the second time through we accept the

         --  first match regardless. Note that there will always be a match the

         --  second time around, because of the default entries at the end of

         --  the table.

         for No_File_Check in False .. True loop

            Unit_Char_Search := Unit_Char;

         <<Repeat_Search>>

         --  The search is repeated with Unit_Char_Search set to b, if an

         --  initial search for the subunit case fails to find any match.

            Pent := SFN_Patterns.First;

            while Pent <= SFN_Patterns.Last loop

               if SFN_Patterns.Table (Pent).Typ = Unit_Char_Search then

                  Name_Len := 0;

                  --  Determine if we have a predefined file name

                  Name_Len := Uname'Length;

                  Name_Buffer (1 .. Name_Len) := Uname;

                  Is_Predef :=

                    Is_Predefined_File_Name (Renamings_Included => True);

                  --  Found a match, execute the pattern

                  Name_Len := Uname'Length;

                  Name_Buffer (1 .. Name_Len) := Uname;

                  --  Apply casing, except that we do not do this for the case

                  --  of a predefined library file. For the latter, we always

                  --  use the all lower case name, regardless of the setting.

                  if not Is_Predef then

                     Set_Casing (SFN_Patterns.Table (Pent).Cas);

                  end if;

                  --  If dot translation required do it

                  Dot  := SFN_Patterns.Table (Pent).Dot;

                  Dotl := Dot.all'Length;

                  if Dot.all /= "." then

                     J := 1;

                     while J <= Name_Len loop

                        if Name_Buffer (J) = '.' then

                           if Dotl = 1 then

                              Name_Buffer (J) := Dot (Dot'First);

                           else

                              Name_Buffer (J + Dotl .. Name_Len + Dotl - 1) :=

                                Name_Buffer (J + 1 .. Name_Len);

                              Name_Buffer (J .. J + Dotl - 1) := Dot.all;

                              Name_Len := Name_Len + Dotl - 1;

                           end if;

                           J := J + Dotl;

                        --  Skip past wide char sequences to avoid messing with

                        --  dot characters that are part of a sequence.

                        elsif Name_Buffer (J) = ASCII.ESC

                          or else (Upper_Half_Encoding

                                    and then

                                      Name_Buffer (J) in Upper_Half_Character)

                        then

                           Skip_Wide (Name_Buffer, J);

                        else

                           J := J + 1;

                        end if;

                     end loop;

                  end if;

                  --  Here move result to right if preinsertion before *

                  Plen := SFN_Patterns.Table (Pent).Pat'Length;

                  for K in 1 .. Plen loop

                     if C (K) = '*' then

                        if K /= 1 then

                           Name_Buffer (1 + K - 1 .. Name_Len + K - 1) :=

                             Name_Buffer (1 .. Name_Len);

                           for L in 1 .. K - 1 loop

                              Name_Buffer (L) := C (L);

                           end loop;

                           Name_Len := Name_Len + K - 1;

                        end if;

                        for L in K + 1 .. Plen loop

                           Name_Len := Name_Len + 1;

                           Name_Buffer (Name_Len) := C (L);

                        end loop;

                        exit;

                     end if;

                  end loop;

                  --  Execute possible crunch on constructed name. The krunch

                  --  operation excludes any extension that may be present.

                  J := Name_Len;

                  while J > 1 loop

                     exit when Name_Buffer (J) = '.';

                     J := J - 1;

                  end loop;

                  --  Case of extension present

                  if J > 1 then

                     declare

                        Ext : constant String := Name_Buffer (J .. Name_Len);

                     begin

                        --  Remove extension

                        Name_Len := J - 1;

                        --  Krunch what's left

                        Krunch

                          (Name_Buffer,

                           Name_Len,

                           Integer (Maximum_File_Name_Length),

                           Debug_Flag_4,

                           OpenVMS_On_Target);

                        --  Replace extension

                        Name_Buffer

                          (Name_Len + 1 .. Name_Len + Ext'Length) := Ext;

                        Name_Len := Name_Len + Ext'Length;

                     end;

                  --  Case of no extension present, straight krunch on the

                  --  entire file name.

                  else

                     Krunch

                       (Name_Buffer,

                        Name_Len,

                        Integer (Maximum_File_Name_Length),

                        Debug_Flag_4);

                  end if;

                  Fnam := Name_Find;

                  --  If we are in the second search of the table, we accept

                  --  the file name without checking, because we know that the

                  --  file does not exist, except when May_Fail is True, in

                  --  which case we return No_File.

                  if No_File_Check then

                     if May_Fail then

                        return No_File;

                     else

                        return Fnam;

                     end if;

                  --  Otherwise we check if the file exists

                  else

                     Pname := Find_File (Fnam, Source);

                     --  If it does exist, we add it to the mappings and return

                     --  the file name.

                     if Pname /= No_File then

                        --  Add to mapping, so that we don't do another path

                        --  search in Find_File for this file name and, if we

                        --  use a mapping file, we are ready to update it at

                        --  the end of this compilation for the benefit of

                        --  other compilation processes.

                        Add_To_File_Map (Get_File_Name.Uname, Fnam, Pname);

                        return Fnam;

                     --  If there are only two entries, they are those of the

                     --  default GNAT naming scheme. The file does not exist,

                     --  but there is no point doing the second search, because

                     --  we will end up with the same file name. Just return

                     --  the file name, or No_File if May_Fail is True.

                     elsif SFN_Patterns.Last = 2 then

                        if May_Fail then

                           return No_File;

                        else

                           return Fnam;

                        end if;

                     --  The file does not exist, but there may be other naming

                     --  scheme. Keep on searching.

                     else

                        Fnam := No_File;

                     end if;

                  end if;

               end if;

               Pent := Pent + 1;

            end loop;

            --  If search failed, and was for a subunit, repeat the search with

            --  Unit_Char_Search reset to 'b', since in the normal case we

            --  simply treat subunits as bodies.

            if Fnam = No_File and then Unit_Char_Search = 'u' then

               Unit_Char_Search := 'b';

               goto Repeat_Search;

            end if;

            --  Repeat entire search in No_File_Check mode if necessary

         end loop;

         --  Something is wrong if search fails completely, since the default

         --  entries should catch all possibilities at this stage.

         raise Program_Error;

      end;

   end Get_File_Name;

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

   -- Get_Unit_Index --

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

   function Get_Unit_Index (Uname : Unit_Name_Type) return Nat is

      N : constant Int := SFN_HTable.Get (Uname);

   begin

      if N /= No_Entry then

         return SFN_Table.Table (N).Index;

      else

         return 0;

      end if;

   end Get_Unit_Index;

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

   -- Initialize --

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

   procedure Initialize is

   begin

      SFN_Table.Init;

      SFN_Patterns.Init;

      --  Add default entries to SFN_Patterns.Table to represent the standard

      --  default GNAT rules for file name translation.

      SFN_Patterns.Append (New_Val =>

        (Pat => new String'("*.ads"),

         Typ => 's',

         Dot => new String'("-"),

         Cas => All_Lower_Case));

      SFN_Patterns.Append (New_Val =>

        (Pat => new String'("*.adb"),

         Typ => 'b',

         Dot => new String'("-"),

         Cas => All_Lower_Case));

   end Initialize;

   ----------

   -- Lock --

   ----------

   procedure Lock is

   begin

      SFN_Table.Locked := True;

      SFN_Table.Release;

   end Lock;

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

   -- Set_File_Name --

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

   procedure Set_File_Name

     (U     : Unit_Name_Type;

      F     : File_Name_Type;

      Index : Nat)

   is

   begin

      SFN_Table.Increment_Last;

      SFN_Table.Table (SFN_Table.Last) := (U, F, Index);

      SFN_HTable.Set (U, SFN_Table.Last);

   end Set_File_Name;

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

   -- Set_File_Name_Pattern --

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

   procedure Set_File_Name_Pattern

     (Pat : String_Ptr;

      Typ : Character;

      Dot : String_Ptr;

      Cas : Casing_Type)

   is

      L : constant Nat := SFN_Patterns.Last;

   begin

      SFN_Patterns.Increment_Last;

      --  Move up the last two entries (the default ones) and then put the new

      --  entry into the table just before them (we always have the default

      --  entries be the last ones).

      SFN_Patterns.Table (L + 1) := SFN_Patterns.Table (L);

      SFN_Patterns.Table (L)     := SFN_Patterns.Table (L - 1);

      SFN_Patterns.Table (L - 1) := (Pat, Typ, Dot, Cas);

   end Set_File_Name_Pattern;

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

   -- SFN_Hash --

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

   function SFN_Hash (F : Unit_Name_Type) return SFN_Header_Num is

   begin

      return SFN_Header_Num (Int (F) rem SFN_Header_Num'Range_Length);

   end SFN_Hash;

begin

   --  We call the initialization routine from the package body, so that

   --  Fname.Init only needs to be called explicitly to reinitialize.

   Fname.UF.Initialize;

end Fname.UF;