1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S Y S T E M . V A L _ C H A R -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2012, 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 32with System.Val_Util; use System.Val_Util; 33 34package body System.Val_Char is 35 36 --------------------- 37 -- Value_Character -- 38 --------------------- 39 40 function Value_Character (Str : String) return Character is 41 F : Natural; 42 L : Natural; 43 S : String (Str'Range) := Str; 44 45 begin 46 Normalize_String (S, F, L); 47 48 -- Accept any single character enclosed in quotes 49 50 if L - F = 2 and then S (F) = ''' and then S (L) = ''' then 51 return Character'Val (Character'Pos (S (F + 1))); 52 53 -- Check control character cases 54 55 else 56 for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop 57 if S (F .. L) = Character'Image (C) then 58 return C; 59 end if; 60 end loop; 61 62 for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop 63 if S (F .. L) = Character'Image (C) then 64 return C; 65 end if; 66 end loop; 67 68 if S (F .. L) = "SOFT_HYPHEN" then 69 return Character'Val (16#AD#); 70 end if; 71 72 Bad_Value (Str); 73 end if; 74 end Value_Character; 75 76end System.Val_Char; 77