| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . V A L _ C H A R -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2023, 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 System.Val_Util; use System.Val_Util; |
| |
| package body System.Val_Char is |
| |
| --------------------- |
| -- Value_Character -- |
| --------------------- |
| |
| function Value_Character (Str : String) return Character is |
| F : Natural; |
| L : Natural; |
| S : String (Str'Range) := Str; |
| |
| begin |
| Normalize_String (S, F, L); |
| |
| -- Accept any single character enclosed in quotes |
| |
| if L - F = 2 and then S (F) = ''' and then S (L) = ''' then |
| return Character'Val (Character'Pos (S (F + 1))); |
| |
| -- Check control character cases |
| |
| else |
| for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop |
| if S (F .. L) = Character'Image (C) then |
| return C; |
| end if; |
| end loop; |
| |
| for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop |
| if S (F .. L) = Character'Image (C) then |
| return C; |
| end if; |
| end loop; |
| |
| if S (F .. L) = "SOFT_HYPHEN" then |
| return Character'Val (16#AD#); |
| end if; |
| |
| Bad_Value (Str); |
| end if; |
| end Value_Character; |
| |
| end System.Val_Char; |
