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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- C S E T S --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1992-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 package Csets is
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33 pragma Elaborate_Body;
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34
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35 -- This package contains character tables for the various character
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36 -- sets that are supported for source representation. Character and
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37 -- string literals are not affected, only identifiers. For each set,
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38 -- the table in this package gives the mapping of letters to their
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39 -- upper case equivalent. Each table thus provides the information
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40 -- for building the table used to fold lower case to upper case, and
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41 -- also the table of flags showing which characters are allowed in
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42 -- identifiers.
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43
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44 type Translate_Table is array (Character) of Character;
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45 -- Type used to describe translate tables
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46
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47 type Char_Array_Flags is array (Character) of Boolean;
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48 -- Type used for character attribute arrays. Note that we deliberately
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49 -- do NOT pack this table, since we don't want the extra overhead of
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50 -- accessing a packed bit string.
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51
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52 ----------------------------------------------
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53 -- Character Tables For Current Compilation --
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54 ----------------------------------------------
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55
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56 procedure Initialize;
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57 -- Routine to initialize following character tables, whose content depends
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58 -- on the character code being used to represent the source program. In
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59 -- particular, the use of the upper half of the 8-bit code set varies.
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60 -- The character set in use is specified by the value stored in
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61 -- Opt.Identifier_Character_Set, which has the following settings:
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62
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63 -- '1' Latin-1 (ISO-8859-1)
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64 -- '2' Latin-2 (ISO-8859-2)
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65 -- '3' Latin-3 (ISO-8859-3)
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66 -- '4' Latin-4 (ISO-8859-4)
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67 -- '5' Cyrillic (ISO-8859-5)
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68 -- 'p' IBM PC (code page 437)
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69 -- '8' IBM PC (code page 850)
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70 -- '9' Latin-9 (ISO-8859-15)
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71 -- 'f' Full upper set (all distinct)
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72 -- 'n' No upper characters (Ada/83 rules)
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73 -- 'w' Latin-1 plus wide characters also allowed
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74
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75 function Is_Upper_Case_Letter (C : Character) return Boolean;
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76 pragma Inline (Is_Upper_Case_Letter);
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77 -- Determine if character is upper case letter
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78
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79 function Is_Lower_Case_Letter (C : Character) return Boolean;
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80 pragma Inline (Is_Lower_Case_Letter);
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81 -- Determine if character is lower case letter
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82
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83 Fold_Upper : Translate_Table;
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84 -- Table to fold lower case identifier letters to upper case
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85
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86 Fold_Lower : Translate_Table;
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87 -- Table to fold upper case identifier letters to lower case
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88
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89 Identifier_Char : Char_Array_Flags;
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90 -- This table has True entries for all characters that can legally appear
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91 -- in identifiers, including digits, the underline character, all letters
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92 -- including upper and lower case and extended letters (as controlled by
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93 -- the setting of Opt.Identifier_Character_Set), left bracket for brackets
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94 -- notation wide characters and also ESC if wide characters are permitted
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95 -- in identifiers using escape sequences starting with ESC.
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96
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97 end Csets;
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