/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (c) 2006-2011, University of Amsterdam
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
:- module(utf8,
[ utf8_codes//1 % ?String
]).
/** <module> UTF-8 encoding/decoding on lists of character codes.
*/
%! utf8_codes(?Codes)// is det.
%
% DCG translating between a Unicode code-list and its UTF-8
% encoded byte-string. The DCG works two ways. Encoding a
% code-list to a UTF-8 byte string is achieved using
%
% phrase(utf8_codes(Codes), UTF8)
%
% The algorithm is a close copy of the C-algorithm used
% internally and defined in src/pl-utf8.c
%
% NOTE: in many cases you can avoid this library and leave
% encoding and decoding to I/O streams. If only part of the data
% is to be encoded the encoding of a stream can be switched
% temporary using set_stream(Stream, encoding(utf8))
%
% @see set_stream/2.
utf8_codes([H|T]) -->
utf8_code(H),
!,
utf8_codes(T).
utf8_codes([]) -->
[].
utf8_code(C) -->
[C0],
{ nonvar(C0) }, % decoding version
!,
( {C0 < 0x80}
-> {C = C0}
; {C0/\0xe0 =:= 0xc0}
-> utf8_cont(C1, 0),
{C is (C0/\0x1f)<<6\/C1}
; {C0/\0xf0 =:= 0xe0}
-> utf8_cont(C1, 6),
utf8_cont(C2, 0),
{C is ((C0/\0xf)<<12)\/C1\/C2}
; {C0/\0xf8 =:= 0xf0}
-> utf8_cont(C1, 12),
utf8_cont(C2, 6),
utf8_cont(C3, 0),
{C is ((C0/\0x7)<<18)\/C1\/C2\/C3}
; {C0/\0xfc =:= 0xf8}
-> utf8_cont(C1, 18),
utf8_cont(C2, 12),
utf8_cont(C3, 6),
utf8_cont(C4, 0),
{C is ((C0/\0x3)<<24)\/C1\/C2\/C3\/C4}
; {C0/\0xfe =:= 0xfc}
-> utf8_cont(C1, 24),
utf8_cont(C2, 18),
utf8_cont(C3, 12),
utf8_cont(C4, 6),
utf8_cont(C5, 0),
{C is ((C0/\0x1)<<30)\/C1\/C2\/C3\/C4\/C5}
).
utf8_code(C) -->
{ nonvar(C) }, % encoding version
!,
( { C < 0x80 }
-> [C]
; { C < 0x800 }
-> { C0 is 0xc0\/((C>>6)/\0x1f),
C1 is 0x80\/(C/\0x3f)
},
[C0,C1]
; { C < 0x10000 }
-> { C0 is 0xe0\/((C>>12)/\0x0f),
C1 is 0x80\/((C>>6)/\0x3f),
C2 is 0x80\/(C/\0x3f)
},
[C0,C1,C2]
; { C < 0x200000 }
-> { C0 is 0xf0\/((C>>18)/\0x07),
C1 is 0x80\/((C>>12)/\0x3f),
C2 is 0x80\/((C>>6)/\0x3f),
C3 is 0x80\/(C/\0x3f)
},
[C0,C1,C2,C3]
; { C < 0x4000000 }
-> { C0 is 0xf8\/((C>>24)/\0x03),
C1 is 0x80\/((C>>18)/\0x3f),
C2 is 0x80\/((C>>12)/\0x3f),
C3 is 0x80\/((C>>6)/\0x3f),
C4 is 0x80\/(C/\0x3f)
},
[C0,C1,C2,C3,C4]
; { C < 0x80000000 }
-> { C0 is 0xfc\/((C>>30)/\0x01),
C1 is 0x80\/((C>>24)/\0x3f),
C2 is 0x80\/((C>>18)/\0x3f),
C3 is 0x80\/((C>>12)/\0x3f),
C4 is 0x80\/((C>>6)/\0x3f),
C5 is 0x80\/(C/\0x3f)
},
[C0,C1,C2,C3,C4,C5]
).
utf8_cont(Val, Shift) -->
[C],
{ C/\0xc0 =:= 0x80,
Val is (C/\0x3f)<<Shift
}.