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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 -- S Y S T E M . V A L _ W C H A R --
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6 -- --
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7 -- B o d y --
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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 with Interfaces; use Interfaces;
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33 with System.Val_Util; use System.Val_Util;
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34 with System.WCh_Cnv; use System.WCh_Cnv;
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35 with System.WCh_Con; use System.WCh_Con;
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36
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37 package body System.Val_WChar is
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38
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39 --------------------------
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40 -- Value_Wide_Character --
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41 --------------------------
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42
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43 function Value_Wide_Character
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44 (Str : String;
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45 EM : System.WCh_Con.WC_Encoding_Method) return Wide_Character
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46 is
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47 WC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str, EM);
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48 WV : constant Unsigned_32 := Wide_Wide_Character'Pos (WC);
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49 begin
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50 if WV > 16#FFFF# then
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51 Bad_Value (Str);
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52 else
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53 return Wide_Character'Val (WV);
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54 end if;
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55 end Value_Wide_Character;
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56
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57 -------------------------------
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58 -- Value_Wide_Wide_Character --
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59 -------------------------------
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60
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61 function Value_Wide_Wide_Character
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62 (Str : String;
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63 EM : System.WCh_Con.WC_Encoding_Method) return Wide_Wide_Character
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64 is
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65 F : Natural;
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66 L : Natural;
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67 S : String (Str'Range) := Str;
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68
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69 begin
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70 Normalize_String (S, F, L);
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71
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72 -- Character literal case
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73
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74 if S (F) = ''' and then S (L) = ''' then
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75
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76 -- Must be at least three characters
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77
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78 if L - F < 2 then
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79 Bad_Value (Str);
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80
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81 -- If just three characters, simple character case
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82
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83 elsif L - F = 2 then
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84 return Wide_Wide_Character'Val (Character'Pos (S (F + 1)));
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85
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86 -- Only other possibility for quoted string is wide char sequence
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87
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88 else
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89 declare
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90 P : Natural;
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91 W : Wide_Wide_Character;
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92
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93 function In_Char return Character;
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94 -- Function for instantiations of Char_Sequence_To_UTF_32
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95
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96 -------------
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97 -- In_Char --
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98 -------------
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99
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100 function In_Char return Character is
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101 begin
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102 P := P + 1;
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103
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104 if P = Str'Last then
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105 Bad_Value (Str);
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106 end if;
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107
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108 return Str (P);
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109 end In_Char;
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110
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111 function UTF_32 is
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112 new Char_Sequence_To_UTF_32 (In_Char);
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113
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114 begin
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115 P := F + 1;
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116
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117 -- Brackets encoding
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118
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119 if S (F + 1) = '[' then
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120 W := Wide_Wide_Character'Val (UTF_32 ('[', WCEM_Brackets));
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121 else
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122 W := Wide_Wide_Character'Val (UTF_32 (S (F + 1), EM));
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123 end if;
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124
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125 if P /= L - 1 then
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126 Bad_Value (Str);
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127 end if;
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128
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129 return W;
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130 end;
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131 end if;
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132
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133 -- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases
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134
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135 elsif Str'Length = 12
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136 and then Str (Str'First .. Str'First + 3) = "Hex_"
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137 then
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138 declare
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139 W : Unsigned_32 := 0;
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140
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141 begin
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142 for J in Str'First + 4 .. Str'First + 11 loop
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143 W := W * 16 + Character'Pos (Str (J));
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144
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145 if Str (J) in '0' .. '9' then
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146 W := W - Character'Pos ('0');
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147 elsif Str (J) in 'A' .. 'F' then
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148 W := W - Character'Pos ('A') + 10;
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149 elsif Str (J) in 'a' .. 'f' then
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150 W := W - Character'Pos ('a') + 10;
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151 else
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152 Bad_Value (Str);
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153 end if;
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154 end loop;
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155
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156 if W > 16#7FFF_FFFF# then
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157 Bad_Value (Str);
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158 else
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159 return Wide_Wide_Character'Val (W);
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160 end if;
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161 end;
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162
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163 -- Otherwise must be one of the special names for Character
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164
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165 else
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166 return
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167 Wide_Wide_Character'Val (Character'Pos (Character'Value (Str)));
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168 end if;
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169
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170 exception
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171 when Constraint_Error =>
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172 Bad_Value (Str);
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173 end Value_Wide_Wide_Character;
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174
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175 end System.Val_WChar;
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