Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-valwch.adb @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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68:561a7518be6b | 111:04ced10e8804 |
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1 ------------------------------------------------------------------------------ | |
2 -- -- | |
3 -- GNAT COMPILER COMPONENTS -- | |
4 -- -- | |
5 -- S Y S T E M . V A L _ W C H A R -- | |
6 -- -- | |
7 -- B o d y -- | |
8 -- -- | |
9 -- Copyright (C) 1992-2017, 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 3, 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. -- | |
17 -- -- | |
18 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
20 -- version 3.1, as published by the Free Software Foundation. -- | |
21 -- -- | |
22 -- You should have received a copy of the GNU General Public License and -- | |
23 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
25 -- <http://www.gnu.org/licenses/>. -- | |
26 -- -- | |
27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
29 -- -- | |
30 ------------------------------------------------------------------------------ | |
31 | |
32 with Interfaces; use Interfaces; | |
33 with System.Val_Util; use System.Val_Util; | |
34 with System.WCh_Cnv; use System.WCh_Cnv; | |
35 with System.WCh_Con; use System.WCh_Con; | |
36 | |
37 package body System.Val_WChar is | |
38 | |
39 -------------------------- | |
40 -- Value_Wide_Character -- | |
41 -------------------------- | |
42 | |
43 function Value_Wide_Character | |
44 (Str : String; | |
45 EM : System.WCh_Con.WC_Encoding_Method) return Wide_Character | |
46 is | |
47 WC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str, EM); | |
48 WV : constant Unsigned_32 := Wide_Wide_Character'Pos (WC); | |
49 begin | |
50 if WV > 16#FFFF# then | |
51 Bad_Value (Str); | |
52 else | |
53 return Wide_Character'Val (WV); | |
54 end if; | |
55 end Value_Wide_Character; | |
56 | |
57 ------------------------------- | |
58 -- Value_Wide_Wide_Character -- | |
59 ------------------------------- | |
60 | |
61 function Value_Wide_Wide_Character | |
62 (Str : String; | |
63 EM : System.WCh_Con.WC_Encoding_Method) return Wide_Wide_Character | |
64 is | |
65 F : Natural; | |
66 L : Natural; | |
67 S : String (Str'Range) := Str; | |
68 | |
69 begin | |
70 Normalize_String (S, F, L); | |
71 | |
72 -- Character literal case | |
73 | |
74 if S (F) = ''' and then S (L) = ''' then | |
75 | |
76 -- Must be at least three characters | |
77 | |
78 if L - F < 2 then | |
79 Bad_Value (Str); | |
80 | |
81 -- If just three characters, simple character case | |
82 | |
83 elsif L - F = 2 then | |
84 return Wide_Wide_Character'Val (Character'Pos (S (F + 1))); | |
85 | |
86 -- Only other possibility for quoted string is wide char sequence | |
87 | |
88 else | |
89 declare | |
90 P : Natural; | |
91 W : Wide_Wide_Character; | |
92 | |
93 function In_Char return Character; | |
94 -- Function for instantiations of Char_Sequence_To_UTF_32 | |
95 | |
96 ------------- | |
97 -- In_Char -- | |
98 ------------- | |
99 | |
100 function In_Char return Character is | |
101 begin | |
102 P := P + 1; | |
103 | |
104 if P = Str'Last then | |
105 Bad_Value (Str); | |
106 end if; | |
107 | |
108 return Str (P); | |
109 end In_Char; | |
110 | |
111 function UTF_32 is | |
112 new Char_Sequence_To_UTF_32 (In_Char); | |
113 | |
114 begin | |
115 P := F + 1; | |
116 | |
117 -- Brackets encoding | |
118 | |
119 if S (F + 1) = '[' then | |
120 W := Wide_Wide_Character'Val (UTF_32 ('[', WCEM_Brackets)); | |
121 else | |
122 W := Wide_Wide_Character'Val (UTF_32 (S (F + 1), EM)); | |
123 end if; | |
124 | |
125 if P /= L - 1 then | |
126 Bad_Value (Str); | |
127 end if; | |
128 | |
129 return W; | |
130 end; | |
131 end if; | |
132 | |
133 -- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases | |
134 | |
135 elsif Str'Length = 12 | |
136 and then Str (Str'First .. Str'First + 3) = "Hex_" | |
137 then | |
138 declare | |
139 W : Unsigned_32 := 0; | |
140 | |
141 begin | |
142 for J in Str'First + 4 .. Str'First + 11 loop | |
143 W := W * 16 + Character'Pos (Str (J)); | |
144 | |
145 if Str (J) in '0' .. '9' then | |
146 W := W - Character'Pos ('0'); | |
147 elsif Str (J) in 'A' .. 'F' then | |
148 W := W - Character'Pos ('A') + 10; | |
149 elsif Str (J) in 'a' .. 'f' then | |
150 W := W - Character'Pos ('a') + 10; | |
151 else | |
152 Bad_Value (Str); | |
153 end if; | |
154 end loop; | |
155 | |
156 if W > 16#7FFF_FFFF# then | |
157 Bad_Value (Str); | |
158 else | |
159 return Wide_Wide_Character'Val (W); | |
160 end if; | |
161 end; | |
162 | |
163 -- Otherwise must be one of the special names for Character | |
164 | |
165 else | |
166 return | |
167 Wide_Wide_Character'Val (Character'Pos (Character'Value (Str))); | |
168 end if; | |
169 | |
170 exception | |
171 when Constraint_Error => | |
172 Bad_Value (Str); | |
173 end Value_Wide_Wide_Character; | |
174 | |
175 end System.Val_WChar; |