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Diffstat (limited to 'gcc-4.4.0/gcc/ada/s-valwch.adb')
| -rw-r--r-- | gcc-4.4.0/gcc/ada/s-valwch.adb | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/gcc-4.4.0/gcc/ada/s-valwch.adb b/gcc-4.4.0/gcc/ada/s-valwch.adb new file mode 100644 index 000000000..fd573f88a --- /dev/null +++ b/gcc-4.4.0/gcc/ada/s-valwch.adb @@ -0,0 +1,177 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . V A L _ W C H A R -- +-- -- +-- B o d y -- +-- -- +-- 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 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. -- +-- -- +-- 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. -- +-- -- +-- 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. -- +-- 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; |