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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--          A D A . T E X T _ I O . E N U M E R A T I O N _ A U X           --

--                                                                          --

--                                 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 Ada.Text_IO.Generic_Aux; use Ada.Text_IO.Generic_Aux;

with Ada.Characters.Handling; use Ada.Characters.Handling;

--  Note: this package does not yet deal properly with wide characters ???

package body Ada.Text_IO.Enumeration_Aux is

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

   -- Get_Enum_Lit --

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

   procedure Get_Enum_Lit

     (File   : File_Type;

      Buf    : out String;

      Buflen : out Natural)

   is

      ch  : Integer;

      C   : Character;

   begin

      Buflen := 0;

      Load_Skip (File);

      ch := Getc (File);

      C := Character'Val (ch);

      --  Character literal case. If the initial character is a quote, then

      --  we read as far as we can without backup (see ACVC test CE3905L)

      if C = ''' then

         Store_Char (File, ch, Buf, Buflen);

         ch := Getc (File);

         if ch in 16#20# .. 16#7E# or else ch >= 16#80# then

            Store_Char (File, ch, Buf, Buflen);

            ch := Getc (File);

            if ch = Character'Pos (''') then

               Store_Char (File, ch, Buf, Buflen);

            else

               Ungetc (ch, File);

            end if;

         else

            Ungetc (ch, File);

         end if;

      --  Similarly for identifiers, read as far as we can, in particular,

      --  do read a trailing underscore (again see ACVC test CE3905L to

      --  understand why we do this, although it seems somewhat peculiar).

      else

         --  Identifier must start with a letter

         if not Is_Letter (C) then

            Ungetc (ch, File);

            return;

         end if;

         --  If we do have a letter, loop through the characters quitting on

         --  the first non-identifier character (note that this includes the

         --  cases of hitting a line mark or page mark).

         loop

            C := Character'Val (ch);

            Store_Char (File, Character'Pos (To_Upper (C)), Buf, Buflen);

            ch := Getc (File);

            exit when ch = EOF_Char;

            C := Character'Val (ch);

            exit when not Is_Letter (C)

              and then not Is_Digit (C)

              and then C /= '_';

            exit when C = '_'

              and then Buf (Buflen) = '_';

         end loop;

         Ungetc (ch, File);

      end if;

   end Get_Enum_Lit;

   ---------

   -- Put --

   ---------

   procedure Put

     (File  : File_Type;

      Item  : String;

      Width : Field;

      Set   : Type_Set)

   is

      Actual_Width : constant Count := Count'Max (Count (Width), Item'Length);

   begin

      if Set = Lower_Case and then Item (Item'First) /= ''' then

         declare

            Iteml : String (Item'First .. Item'Last);

         begin

            for J in Item'Range loop

               Iteml (J) := To_Lower (Item (J));

            end loop;

            Put_Item (File, Iteml);

         end;

      else

         Put_Item (File, Item);

      end if;

      for J in 1 .. Actual_Width - Item'Length loop

         Put (File, ' ');

      end loop;

   end Put;

   ----------

   -- Puts --

   ----------

   procedure Puts

     (To   : out String;

      Item : String;

      Set  : Type_Set)

   is

      Ptr : Natural;

   begin

      if Item'Length > To'Length then

         raise Layout_Error;

      else

         Ptr := To'First;

         for J in Item'Range loop

            if Set = Lower_Case and then Item (Item'First) /= ''' then

               To (Ptr) := To_Lower (Item (J));

            else

               To (Ptr) := Item (J);

            end if;

            Ptr := Ptr + 1;

         end loop;

         while Ptr <= To'Last loop

            To (Ptr) := ' ';

            Ptr := Ptr + 1;

         end loop;

      end if;

   end Puts;

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

   -- Scan_Enum_Lit --

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

   procedure Scan_Enum_Lit

     (From  : String;

      Start : out Natural;

      Stop  : out Natural)

   is

      C  : Character;

   --  Processing for Scan_Enum_Lit

   begin

      String_Skip (From, Start);

      --  Character literal case. If the initial character is a quote, then

      --  we read as far as we can without backup (see ACVC test CE3905L

      --  which is for the analogous case for reading from a file).

      if From (Start) = ''' then

         Stop := Start;

         if Stop = From'Last then

            raise Data_Error;

         else

            Stop := Stop + 1;

         end if;

         if From (Stop) in ' ' .. '~'

           or else From (Stop) >= Character'Val (16#80#)

         then

            if Stop = From'Last then

               raise Data_Error;

            else

               Stop := Stop + 1;

               if From (Stop) = ''' then

                  return;

               end if;

            end if;

         end if;

         raise Data_Error;

      --  Similarly for identifiers, read as far as we can, in particular,

      --  do read a trailing underscore (again see ACVC test CE3905L to

      --  understand why we do this, although it seems somewhat peculiar).

      else

         --  Identifier must start with a letter

         if not Is_Letter (From (Start)) then

            raise Data_Error;

         end if;

         --  If we do have a letter, loop through the characters quitting on

         --  the first non-identifier character (note that this includes the

         --  cases of hitting a line mark or page mark).

         Stop := Start;

         while Stop < From'Last loop

            C := From (Stop + 1);

            exit when not Is_Letter (C)

              and then not Is_Digit (C)

              and then C /= '_';

            exit when C = '_'

              and then From (Stop) = '_';

            Stop := Stop + 1;

         end loop;

      end if;

   end Scan_Enum_Lit;

end Ada.Text_IO.Enumeration_Aux;