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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc4/] [gcc/] [ada/] [s-valwch.adb] - Rev 519
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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) 1992-2009, 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;