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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-valwch.adb')
| -rw-r--r-- | gcc-4.2.1/gcc/ada/s-valwch.adb | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-valwch.adb b/gcc-4.2.1/gcc/ada/s-valwch.adb new file mode 100644 index 000000000..63e02eee7 --- /dev/null +++ b/gcc-4.2.1/gcc/ada/s-valwch.adb @@ -0,0 +1,124 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . V A L _ W C H A R -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2005, 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; + +package body System.Val_WChar is + + -------------------------- + -- Value_Wide_Character -- + -------------------------- + + function Value_Wide_Character + (Str : String) return Wide_Character + is + WWC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str); + WWV : constant Unsigned_32 := Wide_Wide_Character'Pos (WWC); + begin + if WWV > 16#FFFF# then + raise Constraint_Error + with "out of range character for Value attribute"; + else + return Wide_Character'Val (WWV); + end if; + end Value_Wide_Character; + + ------------------------------- + -- Value_Wide_Wide_Character -- + ------------------------------- + + function Value_Wide_Wide_Character + (Str : String) 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 + + -- If just three characters, simple character case + + if L - F = 2 then + return Wide_Wide_Character'Val (Character'Pos (S (F + 1))); + + -- Otherwise something is very wrong + + else + raise Constraint_Error with "invalid string for Value attribute"; + end if; + + -- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases + + elsif Str'Length = 12 and then Str (1 .. 4) = "Hex_" then + declare + W : Unsigned_32 := 0; + + begin + for J in 5 .. 12 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 + with "illegal hex character for Value attribute"; + end if; + end loop; + + if W > 16#7FFF_FFFF# then + raise Constraint_Error + with "out of range value for Value attribute"; + 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; + end Value_Wide_Wide_Character; + +end System.Val_WChar; |