| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . V A L _ W C H A R -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2021, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Interfaces; use Interfaces; |
| with System.Val_Util; use System.Val_Util; |
| with System.WCh_Cnv; use System.WCh_Cnv; |
| with System.WCh_Con; use System.WCh_Con; |
| |
| package body System.Val_WChar is |
| |
| -------------------------- |
| -- Value_Wide_Character -- |
| -------------------------- |
| |
| function Value_Wide_Character |
| (Str : String; |
| EM : System.WCh_Con.WC_Encoding_Method) return Wide_Character |
| is |
| WC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str, EM); |
| WV : constant Unsigned_32 := Wide_Wide_Character'Pos (WC); |
| begin |
| if WV > 16#FFFF# then |
| Bad_Value (Str); |
| else |
| return Wide_Character'Val (WV); |
| end if; |
| end Value_Wide_Character; |
| |
| ------------------------------- |
| -- Value_Wide_Wide_Character -- |
| ------------------------------- |
| |
| function Value_Wide_Wide_Character |
| (Str : String; |
| EM : System.WCh_Con.WC_Encoding_Method) return Wide_Wide_Character |
| is |
| F : Natural; |
| L : Natural; |
| S : String (Str'Range) := Str; |
| |
| begin |
| Normalize_String (S, F, L); |
| |
| -- Character literal case |
| |
| if S (F) = ''' and then S (L) = ''' then |
| |
| -- Must be at least three characters |
| |
| if L - F < 2 then |
| Bad_Value (Str); |
| |
| -- If just three characters, simple character case |
| |
| elsif L - F = 2 then |
| return Wide_Wide_Character'Val (Character'Pos (S (F + 1))); |
| |
| -- Only other possibility for quoted string is wide char sequence |
| |
| else |
| declare |
| P : Natural; |
| W : Wide_Wide_Character; |
| |
| function In_Char return Character; |
| -- Function for instantiations of Char_Sequence_To_UTF_32 |
| |
| ------------- |
| -- In_Char -- |
| ------------- |
| |
| function In_Char return Character is |
| begin |
| P := P + 1; |
| |
| if P = Str'Last then |
| Bad_Value (Str); |
| end if; |
| |
| return Str (P); |
| end In_Char; |
| |
| function UTF_32 is |
| new Char_Sequence_To_UTF_32 (In_Char); |
| |
| begin |
| P := F + 1; |
| |
| -- Brackets encoding |
| |
| if S (F + 1) = '[' then |
| W := Wide_Wide_Character'Val (UTF_32 ('[', WCEM_Brackets)); |
| else |
| W := Wide_Wide_Character'Val (UTF_32 (S (F + 1), EM)); |
| end if; |
| |
| if P /= L - 1 then |
| Bad_Value (Str); |
| end if; |
| |
| return W; |
| end; |
| end if; |
| |
| -- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases |
| |
| elsif Str'Length = 12 |
| and then Str (Str'First .. Str'First + 3) = "Hex_" |
| then |
| declare |
| W : Unsigned_32 := 0; |
| |
| begin |
| for J in Str'First + 4 .. Str'First + 11 loop |
| W := W * 16 + Character'Pos (Str (J)); |
| |
| if Str (J) in '0' .. '9' then |
| W := W - Character'Pos ('0'); |
| elsif Str (J) in 'A' .. 'F' then |
| W := W - Character'Pos ('A') + 10; |
| elsif Str (J) in 'a' .. 'f' then |
| W := W - Character'Pos ('a') + 10; |
| else |
| Bad_Value (Str); |
| end if; |
| end loop; |
| |
| if W > 16#7FFF_FFFF# then |
| Bad_Value (Str); |
| else |
| return Wide_Wide_Character'Val (W); |
| end if; |
| end; |
| |
| -- Otherwise must be one of the special names for Character |
| |
| else |
| return |
| Wide_Wide_Character'Val (Character'Pos (Character'Value (Str))); |
| end if; |
| |
| exception |
| when Constraint_Error => |
| Bad_Value (Str); |
| end Value_Wide_Wide_Character; |
| |
| end System.Val_WChar; |
