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

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                               C A S I N G                                --

--                                                                          --

--                                 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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

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

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

--                                                                          --

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

with Csets;    use Csets;

with Namet;    use Namet;

with Opt;      use Opt;

with Widechar; use Widechar;

package body Casing is

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

   -- Determine_Casing --

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

   function Determine_Casing (Ident : Text_Buffer) return Casing_Type is

      All_Lower : Boolean := True;

      --  Set False if upper case letter found

      All_Upper : Boolean := True;

      --  Set False if lower case letter found

      Mixed : Boolean := True;

      --  Set False if exception to mixed case rule found (lower case letter

      --  at start or after underline, or upper case letter elsewhere).

      Decisive : Boolean := False;

      --  Set True if at least one instance of letter not after underline

      After_Und : Boolean := True;

      --  True at start of string, and after an underline character

   begin

      for S in Ident'Range loop

         if Ident (S) = '_' or else Ident (S) = '.' then

            After_Und := True;

         elsif Is_Lower_Case_Letter (Ident (S)) then

            All_Upper := False;

            if not After_Und then

               Decisive := True;

            else

               After_Und := False;

               Mixed := False;

            end if;

         elsif Is_Upper_Case_Letter (Ident (S)) then

            All_Lower := False;

            if not After_Und then

               Decisive := True;

               Mixed := False;

            else

               After_Und := False;

            end if;

         end if;

      end loop;

      --  Now we can figure out the result from the flags we set in that loop

      if All_Lower then

         return All_Lower_Case;

      elsif not Decisive then

         return Unknown;

      elsif All_Upper then

         return All_Upper_Case;

      elsif Mixed then

         return Mixed_Case;

      else

         return Unknown;

      end if;

   end Determine_Casing;

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

   -- Set_All_Upper_Case --

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

   procedure Set_All_Upper_Case is

   begin

      Set_Casing (All_Upper_Case);

   end Set_All_Upper_Case;

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

   -- Set_Casing --

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

   procedure Set_Casing (C : Casing_Type; D : Casing_Type := Mixed_Case) is

      Ptr : Natural;

      Actual_Casing : Casing_Type;

      --  Set from C or D as appropriate

      After_Und : Boolean := True;

      --  True at start of string, and after an underline character or after

      --  any other special character that is not a normal identifier char).

   begin

      if C /= Unknown then

         Actual_Casing := C;

      else

         Actual_Casing := D;

      end if;

      Ptr := 1;

      while Ptr <= Name_Len loop

         --  Wide character. Note that we do nothing with casing in this case.

         --  In Ada 2005 mode, required folding of lower case letters happened

         --  as the identifier was scanned, and we do not attempt any further

         --  messing with case (note that in any case we do not know how to

         --  fold upper case to lower case in wide character mode). We also

         --  do not bother with recognizing punctuation as equivalent to an

         --  underscore. There is nothing functional at this stage in doing

         --  the requested casing operation, beyond folding to upper case

         --  when it is mandatory, which does not involve underscores.

         if Name_Buffer (Ptr) = ASCII.ESC

           or else Name_Buffer (Ptr) = '['

           or else (Upper_Half_Encoding

                     and then Name_Buffer (Ptr) in Upper_Half_Character)

         then

            Skip_Wide (Name_Buffer, Ptr);

            After_Und := False;

         --  Underscore, or non-identifer character (error case)

         elsif Name_Buffer (Ptr) = '_'

            or else not Identifier_Char (Name_Buffer (Ptr))

         then

            After_Und := True;

            Ptr := Ptr + 1;

         --  Lower case letter

         elsif Is_Lower_Case_Letter (Name_Buffer (Ptr)) then

            if Actual_Casing = All_Upper_Case

              or else (After_Und and then Actual_Casing = Mixed_Case)

            then

               Name_Buffer (Ptr) := Fold_Upper (Name_Buffer (Ptr));

            end if;

            After_Und := False;

            Ptr := Ptr + 1;

         --  Upper case letter

         elsif Is_Upper_Case_Letter (Name_Buffer (Ptr)) then

            if Actual_Casing = All_Lower_Case

              or else (not After_Und and then Actual_Casing = Mixed_Case)

            then

               Name_Buffer (Ptr) := Fold_Lower (Name_Buffer (Ptr));

            end if;

            After_Und := False;

            Ptr := Ptr + 1;

         --  Other identifier character (must be digit)

         else

            After_Und := False;

            Ptr := Ptr + 1;

         end if;

      end loop;

   end Set_Casing;

end Casing;