-- --
-- B o d y --
-- --
--- $Revision: 1.2 $ --
--- --
--- Copyright (C) 1992-1997, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2009, 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 2, or (at your option) any later ver- --
+-- 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- 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. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- 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. --
--- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+-- 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;
-with System.WCh_StW; use System.WCh_StW;
package body System.Val_WChar is
--------------------------
function Value_Wide_Character
- (Str : String;
- EM : WC_Encoding_Method)
- return 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
+ raise Constraint_Error with
+ "out of range character for Value attribute";
+ 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;
if S (F) = ''' and then S (L) = ''' then
+ -- Must be at least three characters
+
+ if L - F < 2 then
+ raise Constraint_Error;
+
-- If just three characters, simple character case
- if L - F = 2 then
- return Wide_Character'Val (Character'Pos (S (F + 1)));
+ elsif L - F = 2 then
+ return Wide_Wide_Character'Val (Character'Pos (S (F + 1)));
- -- Otherwise must be a wide character in quotes. The easiest
- -- thing is to convert the string to a wide string and then
- -- pick up the single character that it should contain.
+ -- Only other possibility for quoted string is wide char sequence
else
declare
- WS : constant Wide_String :=
- String_To_Wide_String (S (F + 1 .. L - 1), EM);
+ 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
+ raise Constraint_Error;
+ end if;
+
+ return Str (P);
+ end In_Char;
+
+ function UTF_32 is
+ new Char_Sequence_To_UTF_32 (In_Char);
begin
- if WS'Length /= 1 then
- raise Constraint_Error;
+ P := F + 1;
+
+ -- Brackets encoding
+ if S (F + 1) = '[' then
+ W := Wide_Wide_Character'Val (UTF_32 ('[', WCEM_Brackets));
else
- return WS (WS'First);
+ W := Wide_Wide_Character'Val (UTF_32 (S (F + 1), EM));
end if;
+
+ if P /= L - 1 then
+ raise Constraint_Error;
+ end if;
+
+ return W;
end;
end if;
- -- the last two values of the type have language-defined names:
+ -- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases
- elsif S = "FFFE" then
- return Wide_Character'Val (16#FFFE#);
+ elsif Str'Length = 12
+ and then Str (Str'First .. Str'First + 3) = "Hex_"
+ then
+ declare
+ W : Unsigned_32 := 0;
- elsif S = "FFFF" then
- return Wide_Character'Val (16#FFFF#);
+ begin
+ for J in Str'First + 4 .. Str'First + 11 loop
+ W := W * 16 + Character'Pos (Str (J));
- -- Otherwise must be a control character
+ 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
+ raise Constraint_Error;
+ end if;
+ end loop;
- else
- for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop
- if S (F .. L) = Character'Image (C) then
- return Wide_Character'Val (Character'Pos (C));
+ if W > 16#7FFF_FFFF# then
+ raise Constraint_Error;
+ else
+ return Wide_Wide_Character'Val (W);
end if;
- end loop;
+ end;
- for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop
- if S (F .. L) = Character'Image (C) then
- return Wide_Character'Val (Character'Pos (C));
- end if;
- end loop;
+ -- Otherwise must be one of the special names for Character
- raise Constraint_Error;
+ else
+ return
+ Wide_Wide_Character'Val (Character'Pos (Character'Value (Str)));
end if;
- end Value_Wide_Character;
+ exception
+ when Constraint_Error =>
+ raise Constraint_Error with "invalid string for value attribute";
+ end Value_Wide_Wide_Character;
end System.Val_WChar;
OSDN Git Service
