projects / thirdparty / gcc.git / blame
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|---|---|---|
| cacbc350 RK |
1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT RUNTIME COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- S Y S T E M . W I D _ W C H A R -- | |
| 6 | -- -- | |
| 7 | -- B o d y -- | |
| 8 | -- -- | |
| 82c80734 | 9 | -- Copyright (C) 1992-2005 Free Software Foundation, Inc. -- |
| cacbc350 RK |
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, 59 Temple Place - Suite 330, Boston, -- | |
| 20 | -- MA 02111-1307, 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. -- | |
| 71ff80dc | 30 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| cacbc350 RK |
31 | -- -- |
| 32 | ------------------------------------------------------------------------------ | |
| 33 | ||
| 34 | with System.WCh_Con; use System.WCh_Con; | |
| 35 | ||
| 36 | package body System.Wid_WChar is | |
| 37 | ||
| 38 | -------------------------- | |
| 39 | -- Width_Wide_Character -- | |
| 40 | -------------------------- | |
| 41 | ||
| 42 | function Width_Wide_Character | |
| 43 | (Lo, Hi : Wide_Character; | |
| 82c80734 | 44 | EM : WC_Encoding_Method) return Natural |
| cacbc350 RK |
45 | is |
| 46 | W : Natural; | |
| 47 | P : Natural; | |
| 48 | ||
| 49 | begin | |
| 50 | W := 0; | |
| cacbc350 RK |
51 | for C in Lo .. Hi loop |
| 52 | P := Wide_Character'Pos (C); | |
| 53 | ||
| 54 | -- Here if we find a character in wide character range | |
| 55 | ||
| 56 | if P > 16#FF# then | |
| 57 | ||
| 58 | case EM is | |
| 59 | ||
| 60 | when WCEM_Hex => | |
| 61 | return Natural'Max (W, 5); | |
| 62 | ||
| 63 | when WCEM_Upper => | |
| 64 | return Natural'Max (W, 2); | |
| 65 | ||
| 66 | when WCEM_Shift_JIS => | |
| 67 | return Natural'Max (W, 2); | |
| 68 | ||
| 69 | when WCEM_EUC => | |
| 70 | return Natural'Max (W, 2); | |
| 71 | ||
| 72 | when WCEM_UTF8 => | |
| 73 | if Hi > Wide_Character'Val (16#07FF#) then | |
| 74 | return Natural'Max (W, 3); | |
| 75 | else | |
| 76 | return Natural'Max (W, 2); | |
| 77 | end if; | |
| 78 | ||
| 79 | when WCEM_Brackets => | |
| 80 | return Natural'Max (W, 8); | |
| 81 | ||
| 82 | end case; | |
| 83 | ||
| 84 | -- If we are in character range then use length of character image | |
| 85 | ||
| 86 | else | |
| 87 | declare | |
| 88 | S : constant String := Character'Image (Character'Val (P)); | |
| 89 | begin | |
| 90 | W := Natural'Max (W, S'Length); | |
| 91 | end; | |
| 92 | end if; | |
| 93 | end loop; | |
| 94 | ||
| 95 | return W; | |
| 96 | end Width_Wide_Character; | |
| 97 | ||
| 82c80734 RD |
98 | ------------------------------- |
| 99 | -- Width_Wide_Wide_Character -- | |
| 100 | ------------------------------- | |
| 101 | ||
| 102 | function Width_Wide_Wide_Character | |
| 103 | (Lo, Hi : Wide_Wide_Character; | |
| 104 | EM : WC_Encoding_Method) return Natural | |
| 105 | is | |
| 106 | W : Natural; | |
| 107 | P : Natural; | |
| 108 | ||
| 109 | begin | |
| 110 | W := 0; | |
| 111 | for C in Lo .. Hi loop | |
| 112 | P := Wide_Wide_Character'Pos (C); | |
| 113 | ||
| 114 | -- Here if we find a character in wide wide character range | |
| 115 | ||
| 116 | if P > 16#FF# then | |
| 117 | case EM is | |
| 118 | when WCEM_Hex => | |
| 119 | return Natural'Max (W, 5); | |
| 120 | ||
| 121 | when WCEM_Upper => | |
| 122 | return Natural'Max (W, 2); | |
| 123 | ||
| 124 | when WCEM_Shift_JIS => | |
| 125 | return Natural'Max (W, 2); | |
| 126 | ||
| 127 | when WCEM_EUC => | |
| 128 | return Natural'Max (W, 2); | |
| 129 | ||
| 130 | when WCEM_UTF8 => | |
| 131 | if Hi > Wide_Wide_Character'Val (16#FFFF#) then | |
| 132 | return Natural'Max (W, 4); | |
| 133 | elsif Hi > Wide_Wide_Character'Val (16#07FF#) then | |
| 134 | return Natural'Max (W, 3); | |
| 135 | else | |
| 136 | return Natural'Max (W, 2); | |
| 137 | end if; | |
| 138 | ||
| 139 | when WCEM_Brackets => | |
| 140 | return Natural'Max (W, 10); | |
| 141 | ||
| 142 | end case; | |
| 143 | ||
| 144 | -- If we are in character range then use length of character image | |
| 145 | ||
| 146 | else | |
| 147 | declare | |
| 148 | S : constant String := Character'Image (Character'Val (P)); | |
| 149 | begin | |
| 150 | W := Natural'Max (W, S'Length); | |
| 151 | end; | |
| 152 | end if; | |
| 153 | end loop; | |
| 154 | ||
| 155 | return W; | |
| 156 | end Width_Wide_Wide_Character; | |
| 157 | ||
| cacbc350 | 158 | end System.Wid_WChar; |