New Language: Ada

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                                C S E T S                                 --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.16 $                             --
+--                                                                          --
+--          Copyright (C) 1992-1997 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). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+package Csets is
+pragma Elaborate_Body (Csets);
+
+   --  This package contains character tables for the various character
+   --  sets that are supported for source representation. Character and
+   --  string literals are not affected, only identifiers. For each set,
+   --  the table in this package gives the mapping of letters to their
+   --  upper case equivalent. Each table thus provides the information
+   --  for building the table used to fold lower case to upper case, and
+   --  also the table of flags showing which characters are allowed in
+   --  identifiers.
+
+   type Translate_Table is array (Character) of Character;
+   --  Type used to describe translate tables
+
+   type Char_Array_Flags is array (Character) of Boolean;
+   --  Type used for character attribute arrays. Note that we deliberately
+   --  do NOT pack this table, since we don't want the extra overhead of
+   --  accessing a packed bit string.
+
+   -----------------------------------------------
+   --  Character Tables For Current Compilation --
+   -----------------------------------------------
+
+   procedure Initialize;
+   --  Routine to initialize following character tables, whose content depends
+   --  on the character code being used to represent the source program. In
+   --  particular, the use of the upper half of the 8-bit code set varies.
+   --  The character set in use is specified by the value stored in
+   --  Opt.Identifier_Character_Set, which has the following settings:
+
+   --    '1'  Latin-1
+   --    '2'  Latin-2
+   --    '3'  Latin-3
+   --    '4'  Latin-4
+   --    'p'  IBM PC (code page 437)
+   --    '8'  IBM PC (code page 850)
+   --    'f'  Full upper set (all distinct)
+   --    'n'  No upper characters (Ada/83 rules)
+   --    'w'  Latin-1 plus wide characters also allowed
+
+   function Is_Upper_Case_Letter (C : Character) return Boolean;
+   pragma Inline (Is_Upper_Case_Letter);
+   --  Determine if character is upper case letter
+
+   function Is_Lower_Case_Letter (C : Character) return Boolean;
+   pragma Inline (Is_Lower_Case_Letter);
+   --  Determine if character is lower case letter
+
+   Fold_Upper : Translate_Table;
+   --  Table to fold lower case identifier letters to upper case
+
+   Fold_Lower : Translate_Table;
+   --  Table to fold upper case identifier letters to lower case
+
+   Identifier_Char : Char_Array_Flags;
+   --  This table has True entries for all characters that can legally appear
+   --  in identifiers, including digits, the underline character, all letters
+   --  including upper and lower case and extended letters (as controlled by
+   --  the setting of Opt.Identifier_Character_Set, left bracket for brackets
+   --  notation wide characters and also ESC if wide characters are permitted
+   --  in identifiers using escape sequences starting with ESC.
+
+end Csets;