gcc/ada/csets.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                C S E T S                                 --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 package Csets is
  35    pragma Elaborate_Body;
  36
  37    --  This package contains character tables for the various character
  38    --  sets that are supported for source representation. Character and
  39    --  string literals are not affected, only identifiers. For each set,
  40    --  the table in this package gives the mapping of letters to their
  41    --  upper case equivalent. Each table thus provides the information
  42    --  for building the table used to fold lower case to upper case, and
  43    --  also the table of flags showing which characters are allowed in
  44    --  identifiers.
  45
  46    type Translate_Table is array (Character) of Character;
  47    --  Type used to describe translate tables
  48
  49    type Char_Array_Flags is array (Character) of Boolean;
  50    --  Type used for character attribute arrays. Note that we deliberately
  51    --  do NOT pack this table, since we don't want the extra overhead of
  52    --  accessing a packed bit string.
  53
  54    ----------------------------------------------
  55    -- Character Tables For Current Compilation --
  56    ----------------------------------------------
  57
  58    procedure Initialize;
  59    --  Routine to initialize following character tables, whose content depends
  60    --  on the character code being used to represent the source program. In
  61    --  particular, the use of the upper half of the 8-bit code set varies.
  62    --  The character set in use is specified by the value stored in
  63    --  Opt.Identifier_Character_Set, which has the following settings:
  64
  65    --    '1'  Latin-1 (ISO-8859-1)
  66    --    '2'  Latin-2 (ISO-8859-2)
  67    --    '3'  Latin-3 (ISO-8859-3)
  68    --    '4'  Latin-4 (ISO-8859-4)
  69    --    '5'  Latin-5 (ISO-8859-5, Cyrillic)
  70    --    'p'  IBM PC  (code page 437)
  71    --    '8'  IBM PC  (code page 850)
  72    --    '9'  Latin-9 (ISO-9959-9)
  73    --    'f'  Full upper set (all distinct)
  74    --    'n'  No upper characters (Ada/83 rules)
  75    --    'w'  Latin-1 plus wide characters also allowed
  76
  77    function Is_Upper_Case_Letter (C : Character) return Boolean;
  78    pragma Inline (Is_Upper_Case_Letter);
  79    --  Determine if character is upper case letter
  80
  81    function Is_Lower_Case_Letter (C : Character) return Boolean;
  82    pragma Inline (Is_Lower_Case_Letter);
  83    --  Determine if character is lower case letter
  84
  85    Fold_Upper : Translate_Table;
  86    --  Table to fold lower case identifier letters to upper case
  87
  88    Fold_Lower : Translate_Table;
  89    --  Table to fold upper case identifier letters to lower case
  90
  91    Identifier_Char : Char_Array_Flags;
  92    --  This table has True entries for all characters that can legally appear
  93    --  in identifiers, including digits, the underline character, all letters
  94    --  including upper and lower case and extended letters (as controlled by
  95    --  the setting of Opt.Identifier_Character_Set, left bracket for brackets
  96    --  notation wide characters and also ESC if wide characters are permitted
  97    --  in identifiers using escape sequences starting with ESC.
  98
  99 end Csets;