113 lines
4.6 KiB
Ada
113 lines
4.6 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . V A L _ W C H A R --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-1997, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with System.Val_Util; use System.Val_Util;
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with System.WCh_Con; use System.WCh_Con;
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with System.WCh_StW; use System.WCh_StW;
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package body System.Val_WChar is
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--------------------------
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-- Value_Wide_Character --
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--------------------------
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function Value_Wide_Character
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(Str : String;
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EM : WC_Encoding_Method)
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return Wide_Character
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is
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F : Natural;
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L : Natural;
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S : String (Str'Range) := Str;
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begin
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Normalize_String (S, F, L);
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-- Character literal case
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if S (F) = ''' and then S (L) = ''' then
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-- If just three characters, simple character case
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if L - F = 2 then
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return Wide_Character'Val (Character'Pos (S (F + 1)));
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-- Otherwise must be a wide character in quotes. The easiest
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-- thing is to convert the string to a wide string and then
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-- pick up the single character that it should contain.
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else
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declare
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WS : constant Wide_String :=
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String_To_Wide_String (S (F + 1 .. L - 1), EM);
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begin
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if WS'Length /= 1 then
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raise Constraint_Error;
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else
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return WS (WS'First);
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end if;
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end;
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end if;
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-- the last two values of the type have language-defined names:
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elsif S = "FFFE" then
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return Wide_Character'Val (16#FFFE#);
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elsif S = "FFFF" then
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return Wide_Character'Val (16#FFFF#);
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-- Otherwise must be a control character
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else
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for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop
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if S (F .. L) = Character'Image (C) then
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return Wide_Character'Val (Character'Pos (C));
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end if;
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end loop;
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for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop
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if S (F .. L) = Character'Image (C) then
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return Wide_Character'Val (Character'Pos (C));
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end if;
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end loop;
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raise Constraint_Error;
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end if;
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end Value_Wide_Character;
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end System.Val_WChar;
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