176 lines
6.1 KiB
Ada
176 lines
6.1 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) 1992-2012, 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 3, 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. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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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 Interfaces; use Interfaces;
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with System.Val_Util; use System.Val_Util;
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with System.WCh_Cnv; use System.WCh_Cnv;
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with System.WCh_Con; use System.WCh_Con;
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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 : System.WCh_Con.WC_Encoding_Method) return Wide_Character
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is
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WC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str, EM);
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WV : constant Unsigned_32 := Wide_Wide_Character'Pos (WC);
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begin
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if WV > 16#FFFF# then
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Bad_Value (Str);
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else
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return Wide_Character'Val (WV);
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end if;
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end Value_Wide_Character;
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-------------------------------
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-- Value_Wide_Wide_Character --
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-------------------------------
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function Value_Wide_Wide_Character
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(Str : String;
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EM : System.WCh_Con.WC_Encoding_Method) return Wide_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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-- Must be at least three characters
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if L - F < 2 then
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Bad_Value (Str);
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-- If just three characters, simple character case
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elsif L - F = 2 then
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return Wide_Wide_Character'Val (Character'Pos (S (F + 1)));
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-- Only other possibility for quoted string is wide char sequence
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else
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declare
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P : Natural;
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W : Wide_Wide_Character;
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function In_Char return Character;
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-- Function for instantiations of Char_Sequence_To_UTF_32
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-------------
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-- In_Char --
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-------------
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function In_Char return Character is
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begin
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P := P + 1;
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if P = Str'Last then
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Bad_Value (Str);
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end if;
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return Str (P);
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end In_Char;
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function UTF_32 is
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new Char_Sequence_To_UTF_32 (In_Char);
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begin
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P := F + 1;
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-- Brackets encoding
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if S (F + 1) = '[' then
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W := Wide_Wide_Character'Val (UTF_32 ('[', WCEM_Brackets));
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else
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W := Wide_Wide_Character'Val (UTF_32 (S (F + 1), EM));
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end if;
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if P /= L - 1 then
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Bad_Value (Str);
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end if;
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return W;
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end;
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end if;
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-- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases
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elsif Str'Length = 12
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and then Str (Str'First .. Str'First + 3) = "Hex_"
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then
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declare
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W : Unsigned_32 := 0;
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begin
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for J in Str'First + 4 .. Str'First + 11 loop
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W := W * 16 + Character'Pos (Str (J));
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if Str (J) in '0' .. '9' then
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W := W - Character'Pos ('0');
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elsif Str (J) in 'A' .. 'F' then
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W := W - Character'Pos ('A') + 10;
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elsif Str (J) in 'a' .. 'f' then
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W := W - Character'Pos ('a') + 10;
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else
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Bad_Value (Str);
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end if;
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end loop;
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if W > 16#7FFF_FFFF# then
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Bad_Value (Str);
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else
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return Wide_Wide_Character'Val (W);
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end if;
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end;
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-- Otherwise must be one of the special names for Character
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else
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return
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Wide_Wide_Character'Val (Character'Pos (Character'Value (Str)));
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end if;
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exception
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when Constraint_Error =>
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Bad_Value (Str);
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end Value_Wide_Wide_Character;
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end System.Val_WChar;
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