New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45953 138bc75d-0d04-0410-961f-82ee72b054a4

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUNTIME 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                                  --
+--                                                                          --
+--                            $Revision: 1.15 $
+--                                                                          --
+--          Copyright (C) 1992-2001 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 2,  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 COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Ada.Text_IO.Generic_Aux; use Ada.Text_IO.Generic_Aux;
+with Ada.Characters.Handling; use Ada.Characters.Handling;
+with Interfaces.C_Streams;    use Interfaces.C_Streams;
+
+--  Note: this package does not yet deal properly with wide characters ???
+
+package body Ada.Text_IO.Enumeration_Aux is
+
+   -----------------------
+   -- Local Subprograms --
+   -----------------------
+
+   --  These definitions replace the ones in Ada.Characters.Handling, which
+   --  do not seem to work for some strange not understood reason ??? at
+   --  least in the OS/2 version.
+
+   function To_Lower (C : Character) return Character;
+   function To_Upper (C : Character) return Character;
+
+   ------------------
+   -- Get_Enum_Lit --
+   ------------------
+
+   procedure Get_Enum_Lit
+     (File   : File_Type;
+      Buf    : out String;
+      Buflen : out Natural)
+   is
+      ch  : int;
+      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;
+            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 (1) /= ''' 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  : in 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 (1) /= ''' 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;
+
+         Stop := Stop - 1;
+         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;
+
+   --------------
+   -- To_Lower --
+   --------------
+
+   function To_Lower (C : Character) return Character is
+   begin
+      if C in 'A' .. 'Z' then
+         return Character'Val (Character'Pos (C) + 32);
+      else
+         return C;
+      end if;
+   end To_Lower;
+
+   function To_Upper (C : Character) return Character is
+   begin
+      if C in 'a' .. 'z' then
+         return Character'Val (Character'Pos (C) - 32);
+      else
+         return C;
+      end if;
+   end To_Upper;
+
+end Ada.Text_IO.Enumeration_Aux;