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author | Ben Cheng <bccheng@google.com> | 2012-10-01 10:30:31 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2012-10-01 10:30:31 -0700 |
commit | 82bcbebce43f0227f506d75a5b764b6847041bae (patch) | |
tree | fe9f8597b48a430c4daeb5123e3e8eb28e6f9da9 /gcc-4.7/gcc/ada/s-wchstw.adb | |
parent | 3c052de3bb16ac53b6b6ed659ec7557eb84c7590 (diff) | |
download | toolchain_gcc-82bcbebce43f0227f506d75a5b764b6847041bae.tar.gz toolchain_gcc-82bcbebce43f0227f506d75a5b764b6847041bae.tar.bz2 toolchain_gcc-82bcbebce43f0227f506d75a5b764b6847041bae.zip |
Initial check-in of gcc 4.7.2.
Change-Id: I4a2f5a921c21741a0e18bda986d77e5f1bef0365
Diffstat (limited to 'gcc-4.7/gcc/ada/s-wchstw.adb')
-rw-r--r-- | gcc-4.7/gcc/ada/s-wchstw.adb | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/gcc-4.7/gcc/ada/s-wchstw.adb b/gcc-4.7/gcc/ada/s-wchstw.adb new file mode 100644 index 000000000..e50f4c2f6 --- /dev/null +++ b/gcc-4.7/gcc/ada/s-wchstw.adb @@ -0,0 +1,173 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M . W C H _ S T W -- +-- -- +-- 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 System.WCh_Con; use System.WCh_Con; +with System.WCh_Cnv; use System.WCh_Cnv; + +package body System.WCh_StW is + + ----------------------- + -- Local Subprograms -- + ----------------------- + + procedure Get_Next_Code + (S : String; + P : in out Natural; + V : out UTF_32_Code; + EM : WC_Encoding_Method); + -- Scans next character starting at S(P) and returns its value in V. On + -- exit P is updated past the last character read. Raises Constraint_Error + -- if the string is not well formed. Raises Constraint_Error if the code + -- value is greater than 16#7FFF_FFFF#. On entry P <= S'Last. + + ------------------- + -- Get_Next_Code -- + ------------------- + + procedure Get_Next_Code + (S : String; + P : in out Natural; + V : out UTF_32_Code; + EM : WC_Encoding_Method) + is + function In_Char return Character; + -- Function to return a character, bumping P, raises Constraint_Error + -- if P > S'Last on entry. + + function Get_UTF_32 is new Char_Sequence_To_UTF_32 (In_Char); + -- Function to get next UFT_32 value + + ------------- + -- In_Char -- + ------------- + + function In_Char return Character is + begin + if P > S'Last then + raise Constraint_Error with "badly formed wide character code"; + else + P := P + 1; + return S (P - 1); + end if; + end In_Char; + + -- Start of processing for Get_Next_Code + + begin + -- Check for wide character encoding + + case EM is + when WCEM_Hex => + if S (P) = ASCII.ESC then + V := Get_UTF_32 (In_Char, EM); + return; + end if; + + when WCEM_Upper | WCEM_Shift_JIS | WCEM_EUC | WCEM_UTF8 => + if S (P) >= Character'Val (16#80#) then + V := Get_UTF_32 (In_Char, EM); + return; + end if; + + when WCEM_Brackets => + if P + 2 <= S'Last + and then S (P) = '[' + and then S (P + 1) = '"' + and then S (P + 2) /= '"' + then + V := Get_UTF_32 (In_Char, EM); + return; + end if; + end case; + + -- If it is not a wide character code, just get it + + V := Character'Pos (S (P)); + P := P + 1; + end Get_Next_Code; + + --------------------------- + -- String_To_Wide_String -- + --------------------------- + + procedure String_To_Wide_String + (S : String; + R : out Wide_String; + L : out Natural; + EM : System.WCh_Con.WC_Encoding_Method) + is + SP : Natural; + V : UTF_32_Code; + + begin + pragma Assert (S'First = 1); + + SP := S'First; + L := 0; + while SP <= S'Last loop + Get_Next_Code (S, SP, V, EM); + + if V > 16#FFFF# then + raise Constraint_Error with + "out of range value for wide character"; + end if; + + L := L + 1; + R (L) := Wide_Character'Val (V); + end loop; + end String_To_Wide_String; + + -------------------------------- + -- String_To_Wide_Wide_String -- + -------------------------------- + + procedure String_To_Wide_Wide_String + (S : String; + R : out Wide_Wide_String; + L : out Natural; + EM : System.WCh_Con.WC_Encoding_Method) + is + pragma Assert (S'First = 1); + + SP : Natural; + V : UTF_32_Code; + + begin + SP := S'First; + L := 0; + while SP <= S'Last loop + Get_Next_Code (S, SP, V, EM); + L := L + 1; + R (L) := Wide_Wide_Character'Val (V); + end loop; + end String_To_Wide_Wide_String; + +end System.WCh_StW; |