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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- C S E T S --
+-- --
+-- S p e c --
+-- --
+-- 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. --
+-- --
+-- 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. --
+-- --
+------------------------------------------------------------------------------
+
+package Csets is
+ pragma Elaborate_Body;
+
+ -- 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 (ISO-8859-1)
+ -- '2' Latin-2 (ISO-8859-2)
+ -- '3' Latin-3 (ISO-8859-3)
+ -- '4' Latin-4 (ISO-8859-4)
+ -- '5' Latin-5 (ISO-8859-5, Cyrillic)
+ -- 'p' IBM PC (code page 437)
+ -- '8' IBM PC (code page 850)
+ -- '9' Latin-9 (ISO-9959-9)
+ -- '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;