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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . V A L _ W C H A R --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2006, 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- --
-- 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- 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. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- 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;
package body System.Val_WChar is
--------------------------
-- Value_Wide_Character --
--------------------------
function Value_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;
S : String (Str'Range) := Str;
begin
Normalize_String (S, F, L);
-- Character literal case
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
elsif L - F = 2 then
return Wide_Wide_Character'Val (Character'Pos (S (F + 1)));
-- Only other possibility for quoted string is wide char sequence
else
declare
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
P := F + 1;
-- Brackets encoding
if S (F + 1) = '[' then
W := Wide_Wide_Character'Val (UTF_32 ('[', WCEM_Brackets));
else
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;
-- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases
elsif Str'Length = 12
and then Str (Str'First .. Str'First + 3) = "Hex_"
then
declare
W : Unsigned_32 := 0;
begin
for J in Str'First + 4 .. Str'First + 11 loop
W := W * 16 + Character'Pos (Str (J));
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;
if W > 16#7FFF_FFFF# then
raise Constraint_Error;
else
return Wide_Wide_Character'Val (W);
end if;
end;
-- Otherwise must be one of the special names for Character
else
return
Wide_Wide_Character'Val (Character'Pos (Character'Value (Str)));
end if;
exception
when Constraint_Error =>
raise Constraint_Error with "invalid string for value attribute";
end Value_Wide_Wide_Character;
end System.Val_WChar;
|
