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|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . W C H _ C N V --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2018, 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. --
-- --
------------------------------------------------------------------------------
pragma Compiler_Unit_Warning;
with Interfaces; use Interfaces;
with System.WCh_Con; use System.WCh_Con;
with System.WCh_JIS; use System.WCh_JIS;
package body System.WCh_Cnv is
-----------------------------
-- Char_Sequence_To_UTF_32 --
-----------------------------
function Char_Sequence_To_UTF_32
(C : Character;
EM : System.WCh_Con.WC_Encoding_Method) return UTF_32_Code
is
B1 : Unsigned_32;
C1 : Character;
U : Unsigned_32;
W : Unsigned_32;
procedure Get_Hex (N : Character);
-- If N is a hex character, then set B1 to 16 * B1 + character N.
-- Raise Constraint_Error if character N is not a hex character.
procedure Get_UTF_Byte;
pragma Inline (Get_UTF_Byte);
-- Used to interpret a 2#10xxxxxx# continuation byte in UTF-8 mode.
-- Reads a byte, and raises CE if the first two bits are not 10.
-- Otherwise shifts W 6 bits left and or's in the 6 xxxxxx bits.
-------------
-- Get_Hex --
-------------
procedure Get_Hex (N : Character) is
B2 : constant Unsigned_32 := Character'Pos (N);
begin
if B2 in Character'Pos ('0') .. Character'Pos ('9') then
B1 := B1 * 16 + B2 - Character'Pos ('0');
elsif B2 in Character'Pos ('A') .. Character'Pos ('F') then
B1 := B1 * 16 + B2 - (Character'Pos ('A') - 10);
elsif B2 in Character'Pos ('a') .. Character'Pos ('f') then
B1 := B1 * 16 + B2 - (Character'Pos ('a') - 10);
else
raise Constraint_Error;
end if;
end Get_Hex;
------------------
-- Get_UTF_Byte --
------------------
procedure Get_UTF_Byte is
begin
U := Unsigned_32 (Character'Pos (In_Char));
if (U and 2#11000000#) /= 2#10_000000# then
raise Constraint_Error;
end if;
W := Shift_Left (W, 6) or (U and 2#00111111#);
end Get_UTF_Byte;
-- Start of processing for Char_Sequence_To_UTF_32
begin
case EM is
when WCEM_Hex =>
if C /= ASCII.ESC then
return Character'Pos (C);
else
B1 := 0;
Get_Hex (In_Char);
Get_Hex (In_Char);
Get_Hex (In_Char);
Get_Hex (In_Char);
return UTF_32_Code (B1);
end if;
when WCEM_Upper =>
if C > ASCII.DEL then
return 256 * Character'Pos (C) + Character'Pos (In_Char);
else
return Character'Pos (C);
end if;
when WCEM_Shift_JIS =>
if C > ASCII.DEL then
return Wide_Character'Pos (Shift_JIS_To_JIS (C, In_Char));
else
return Character'Pos (C);
end if;
when WCEM_EUC =>
if C > ASCII.DEL then
return Wide_Character'Pos (EUC_To_JIS (C, In_Char));
else
return Character'Pos (C);
end if;
when WCEM_UTF8 =>
-- Note: for details of UTF8 encoding see RFC 3629
U := Unsigned_32 (Character'Pos (C));
-- 16#00_0000#-16#00_007F#: 0xxxxxxx
if (U and 2#10000000#) = 2#00000000# then
return Character'Pos (C);
-- 16#00_0080#-16#00_07FF#: 110xxxxx 10xxxxxx
elsif (U and 2#11100000#) = 2#110_00000# then
W := U and 2#00011111#;
Get_UTF_Byte;
return UTF_32_Code (W);
-- 16#00_0800#-16#00_ffff#: 1110xxxx 10xxxxxx 10xxxxxx
elsif (U and 2#11110000#) = 2#1110_0000# then
W := U and 2#00001111#;
Get_UTF_Byte;
Get_UTF_Byte;
return UTF_32_Code (W);
-- 16#01_0000#-16#10_FFFF#: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
elsif (U and 2#11111000#) = 2#11110_000# then
W := U and 2#00000111#;
for K in 1 .. 3 loop
Get_UTF_Byte;
end loop;
return UTF_32_Code (W);
-- 16#0020_0000#-16#03FF_FFFF#: 111110xx 10xxxxxx 10xxxxxx
-- 10xxxxxx 10xxxxxx
elsif (U and 2#11111100#) = 2#111110_00# then
W := U and 2#00000011#;
for K in 1 .. 4 loop
Get_UTF_Byte;
end loop;
return UTF_32_Code (W);
-- 16#0400_0000#-16#7FFF_FFFF#: 1111110x 10xxxxxx 10xxxxxx
-- 10xxxxxx 10xxxxxx 10xxxxxx
elsif (U and 2#11111110#) = 2#1111110_0# then
W := U and 2#00000001#;
for K in 1 .. 5 loop
Get_UTF_Byte;
end loop;
return UTF_32_Code (W);
else
raise Constraint_Error;
end if;
when WCEM_Brackets =>
if C /= '[' then
return Character'Pos (C);
end if;
if In_Char /= '"' then
raise Constraint_Error;
end if;
B1 := 0;
Get_Hex (In_Char);
Get_Hex (In_Char);
C1 := In_Char;
if C1 /= '"' then
Get_Hex (C1);
Get_Hex (In_Char);
C1 := In_Char;
if C1 /= '"' then
Get_Hex (C1);
Get_Hex (In_Char);
C1 := In_Char;
if C1 /= '"' then
Get_Hex (C1);
Get_Hex (In_Char);
if B1 > Unsigned_32 (UTF_32_Code'Last) then
raise Constraint_Error;
end if;
if In_Char /= '"' then
raise Constraint_Error;
end if;
end if;
end if;
end if;
if In_Char /= ']' then
raise Constraint_Error;
end if;
return UTF_32_Code (B1);
end case;
end Char_Sequence_To_UTF_32;
--------------------------------
-- Char_Sequence_To_Wide_Char --
--------------------------------
function Char_Sequence_To_Wide_Char
(C : Character;
EM : System.WCh_Con.WC_Encoding_Method) return Wide_Character
is
function Char_Sequence_To_UTF is new Char_Sequence_To_UTF_32 (In_Char);
U : constant UTF_32_Code := Char_Sequence_To_UTF (C, EM);
begin
if U > 16#FFFF# then
raise Constraint_Error;
else
return Wide_Character'Val (U);
end if;
end Char_Sequence_To_Wide_Char;
-----------------------------
-- UTF_32_To_Char_Sequence --
-----------------------------
procedure UTF_32_To_Char_Sequence
(Val : UTF_32_Code;
EM : System.WCh_Con.WC_Encoding_Method)
is
Hexc : constant array (UTF_32_Code range 0 .. 15) of Character :=
"0123456789ABCDEF";
C1, C2 : Character;
U : Unsigned_32;
begin
-- Raise CE for invalid UTF_32_Code
if not Val'Valid then
raise Constraint_Error;
end if;
-- Processing depends on encoding mode
case EM is
when WCEM_Hex =>
if Val < 256 then
Out_Char (Character'Val (Val));
elsif Val <= 16#FFFF# then
Out_Char (ASCII.ESC);
Out_Char (Hexc (Val / (16**3)));
Out_Char (Hexc ((Val / (16**2)) mod 16));
Out_Char (Hexc ((Val / 16) mod 16));
Out_Char (Hexc (Val mod 16));
else
raise Constraint_Error;
end if;
when WCEM_Upper =>
if Val < 128 then
Out_Char (Character'Val (Val));
elsif Val < 16#8000# or else Val > 16#FFFF# then
raise Constraint_Error;
else
Out_Char (Character'Val (Val / 256));
Out_Char (Character'Val (Val mod 256));
end if;
when WCEM_Shift_JIS =>
if Val < 128 then
Out_Char (Character'Val (Val));
elsif Val <= 16#FFFF# then
JIS_To_Shift_JIS (Wide_Character'Val (Val), C1, C2);
Out_Char (C1);
Out_Char (C2);
else
raise Constraint_Error;
end if;
when WCEM_EUC =>
if Val < 128 then
Out_Char (Character'Val (Val));
elsif Val <= 16#FFFF# then
JIS_To_EUC (Wide_Character'Val (Val), C1, C2);
Out_Char (C1);
Out_Char (C2);
else
raise Constraint_Error;
end if;
when WCEM_UTF8 =>
-- Note: for details of UTF8 encoding see RFC 3629
U := Unsigned_32 (Val);
-- 16#00_0000#-16#00_007F#: 0xxxxxxx
if U <= 16#00_007F# then
Out_Char (Character'Val (U));
-- 16#00_0080#-16#00_07FF#: 110xxxxx 10xxxxxx
elsif U <= 16#00_07FF# then
Out_Char (Character'Val (2#11000000# or Shift_Right (U, 6)));
Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
-- 16#00_0800#-16#00_FFFF#: 1110xxxx 10xxxxxx 10xxxxxx
elsif U <= 16#00_FFFF# then
Out_Char (Character'Val (2#11100000# or Shift_Right (U, 12)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
-- 16#01_0000#-16#10_FFFF#: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
elsif U <= 16#10_FFFF# then
Out_Char (Character'Val (2#11110000# or Shift_Right (U, 18)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
-- 16#0020_0000#-16#03FF_FFFF#: 111110xx 10xxxxxx 10xxxxxx
-- 10xxxxxx 10xxxxxx
elsif U <= 16#03FF_FFFF# then
Out_Char (Character'Val (2#11111000# or Shift_Right (U, 24)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 18)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
-- 16#0400_0000#-16#7FFF_FFFF#: 1111110x 10xxxxxx 10xxxxxx
-- 10xxxxxx 10xxxxxx 10xxxxxx
elsif U <= 16#7FFF_FFFF# then
Out_Char (Character'Val (2#11111100# or Shift_Right (U, 30)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 24)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 18)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)
and 2#00111111#)));
Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
else
raise Constraint_Error;
end if;
when WCEM_Brackets =>
-- Values in the range 0-255 are directly output. Note that there
-- is an issue with [ (16#5B#) since this will cause confusion
-- if the resulting string is interpreted using brackets encoding.
-- One possibility would be to always output [ as ["5B"] but in
-- practice this is undesirable, since for example normal use of
-- Wide_Text_IO for output (much more common than input), really
-- does want to be able to say something like
-- Put_Line ("Start of output [first run]");
-- and have it come out as intended, rather than contaminated by
-- a ["5B"] sequence in place of the left bracket.
if Val < 256 then
Out_Char (Character'Val (Val));
-- Otherwise use brackets notation for vales greater than 255
else
Out_Char ('[');
Out_Char ('"');
if Val > 16#FFFF# then
if Val > 16#00FF_FFFF# then
Out_Char (Hexc (Val / 16 ** 7));
Out_Char (Hexc ((Val / 16 ** 6) mod 16));
end if;
Out_Char (Hexc ((Val / 16 ** 5) mod 16));
Out_Char (Hexc ((Val / 16 ** 4) mod 16));
end if;
Out_Char (Hexc ((Val / 16 ** 3) mod 16));
Out_Char (Hexc ((Val / 16 ** 2) mod 16));
Out_Char (Hexc ((Val / 16) mod 16));
Out_Char (Hexc (Val mod 16));
Out_Char ('"');
Out_Char (']');
end if;
end case;
end UTF_32_To_Char_Sequence;
--------------------------------
-- Wide_Char_To_Char_Sequence --
--------------------------------
procedure Wide_Char_To_Char_Sequence
(WC : Wide_Character;
EM : System.WCh_Con.WC_Encoding_Method)
is
procedure UTF_To_Char_Sequence is new UTF_32_To_Char_Sequence (Out_Char);
begin
UTF_To_Char_Sequence (Wide_Character'Pos (WC), EM);
end Wide_Char_To_Char_Sequence;
end System.WCh_Cnv;
|
