/usr/lib/swi-prolog/library/fastrw.pl is in swi-prolog-nox 5.10.4-3ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | /* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 2010, VU University Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(fastrw,
[ fast_read/1, % -Term
fast_write/1, % +Term
fast_read/2, % +Stream, -Term
fast_write/2, % +Stream, +Term
fast_write_to_string/3 % +Term, -String, ?Tail
]).
/** <module> Fast reading and writing of terms
This library provides the SICStus and Ciao library(fastrw) interface.
The idea behind this library is to design a fast serialization for
Prolog terms. Ideally, this should be portable between Prolog
implementation. The current implementation provides the API simply using
canonical read/write.
Note that the stream encoding must be the same. Typically, you would
like to use these predicate using UTF-8 encoded streams. See
set_stream/2.
@tbd Establish a fast and portable binary format.
@compat The format is not compatible to SICStus/Ciao (which are not
compatible either). Funture versions of this library might
implement a different encoding.
@see PL_record_external() for a C-based fast binary format.
*/
%% fast_read(-Term)
%
% The next term is read from current standard input and is unified
% with Term. The syntax of the term must agree with fast_read /
% fast_write format. If the end of the input has been reached,
% Term is unified with the term =end_of_file=. Further calls to
% fast_read/1 will then cause an error.
fast_read(Term) :-
read_term(Term, []).
%% fast_write(+Term)
%
% Output Term in a way that fast_read/1 and fast_read/2 will be
% able to read it back.
fast_write(Term) :-
fast_write(current_output, Term).
%% fast_write(+Stream, +Term)
%
% Output Term to Stream in a way that fast_read/1 and fast_read/2
% will be able to read it back.
fast_write(Stream, Term) :-
write_term(Stream, Term,
[ attributes(false),
ignore_ops(true),
quoted(true),
partial(true)
]),
format(Stream, '.~n', []).
%% fast_read(+Stream, -Term)
%
% The next term is read from Stream and unified with Term. The
% syntax of the term must agree with fast_read/fast_write format.
% If the end of the input has been reached, Term is unified with
% the term =end_of_file=. Further calls to fast_read/2 will then
% cause an error.
fast_read(Stream, Term):-
read_term(Stream, Term, []).
%% fast_write_to_string(+Term, -String, ?Tail)
%
% Perform a fast-write to the difference-slist String\Term.
fast_write_to_string(T, S, R) :-
with_output_to(codes(S,R), fast_write(T)).
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