/usr/lib/swi-prolog/library/charsio.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 | /* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 2009, University of 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(charsio,
[ format_to_chars/3, % +Format, +Args, -Codes
format_to_chars/4, % +Format, +Args, -Codes, ?Tail
write_to_chars/2, % +Term, -Codes
write_to_chars/3, % +Term, -Codes, ?Tail
atom_to_chars/2, % +Atom, -Codes
atom_to_chars/3, % +Atom, -Codes, ?Tail
number_to_chars/2, % +Number, -Codes
number_to_chars/3, % +Number, -Codes, ?Tail
% read predicates
read_from_chars/2, % +Codes, -Term
read_term_from_chars/3, % +Codes, -Term, +Options
open_chars_stream/2, % +Codes, -Stream
with_output_to_chars/2, % :Goal, -Codes
with_output_to_chars/3, % :Goal, -Codes, ?Tail
with_output_to_chars/4 % :Goal, -Stream, -Codes, ?Tail
]).
:- use_module(library(error)).
/* :- use_module(library(memfile)). */ % see open_chars_stream/2
:- meta_predicate
with_output_to_chars(0, -),
with_output_to_chars(0, -, ?),
with_output_to_chars(0, -, -, ?).
/** <module> I/O on Lists of Character Codes
This module emulates the Quintus/SICStus library charsio.pl for reading
and writing from/to lists of character codes. Most of these predicates
are straight calls into similar SWI-Prolog primitives. Some can even be
replaced by ISO standard predicates.
@compat The naming of this library is not in line with the ISO standard.
We believe that the SWI-Prolog native predicates form a more elegant
alternative for this library.
*/
%% format_to_chars(+Format, +Args, -Codes) is det.
%
% Use format/2 to write to a list of character codes.
format_to_chars(Format, Args, Codes) :-
format(codes(Codes), Format, Args).
%% format_to_chars(+Format, +Args, -Codes) is det.
%
% Use format/2 to write to a difference list of character codes.
format_to_chars(Format, Args, Codes, Tail) :-
format(codes(Codes, Tail), Format, Args).
%% write_to_chars(+Term, -Codes)
%
% Codes is a list of character codes produced by write/1 on Term.
write_to_chars(Term, Codes) :-
format(codes(Codes), '~w', [Term]).
%% write_to_chars(+Term, -Codes, ?Tail)
%
% Codes is a difference-list of character codes produced by write/1 on Term.
write_to_chars(Term, Codes, Tail) :-
format(codes(Codes, Tail), '~w', [Term]).
%% atom_to_chars(+Atom, -Codes) is det.
%
% Convert Atom into a list of character codes.
%
% @deprecated Use ISO atom_codes/2.
atom_to_chars(Atom, Codes) :-
atom_codes(Atom, Codes).
%% atom_to_chars(+Atom, -Codes, ?Tail) is det.
%
% Convert Atom into a difference-list of character codes.
atom_to_chars(Atom, Codes, Tail) :-
format(codes(Codes, Tail), '~a', [Atom]).
%% number_to_chars(+Number, -Codes) is det.
%
% Convert Atom into a list of character codes.
%
% @deprecated Use ISO number_codes/2.
number_to_chars(Number, Codes) :-
number_codes(Number, Codes).
%% number_to_chars(+Atom, -Codes, ?Tail) is det.
%
% Convert Number into a difference-list of character codes.
number_to_chars(Number, Codes, Tail) :-
must_be(number, Number),
format(codes(Codes, Tail), '~w', [Number]).
%% read_from_chars(+Codes, -Term) is det.
%
% Read Codes into Term.
%
% @compat The SWI-Prolog version does not require Codes to end
% in a full-stop.
read_from_chars("", end_of_file) :- !.
read_from_chars(List, Term) :-
atom_to_term(List, Term, _).
%% read_term_from_chars(+Codes, -Term, +Options) is det.
%
% Read Codes into Term. Options are processed by read_term/3.
%
% @compat sicstus
read_term_from_chars(Codes, Term, Options) :-
setup_call_cleanup(open_chars_stream(Codes, Stream, ' .\n'),
read_term(Stream, Term0, Options),
close(Stream)),
Term = Term0.
%% open_chars_stream(+Codes, -Stream) is det.
%
% Open Codes as an input stream.
%
% @bug Depends on autoloading library(memfile). As many
% applications do not need this predicate we do not
% want to make the entire library dependent on
% autoloading.
open_chars_stream(Codes, Stream) :-
open_chars_stream(Codes, Stream, '').
open_chars_stream(Codes, Stream, Postfix) :-
new_memory_file(MF),
open_memory_file(MF, write, Out),
format(Out, '~s~w', [Codes, Postfix]),
close(Out),
open_memory_file(MF, read, Stream,
[ free_on_close(true)
]).
%% with_output_to_chars(:Goal, Codes) is det.
%
% Run Goal with as once/1. Output written to =current_output=
% is collected in Codes.
with_output_to_chars(Goal, Codes) :-
with_output_to(codes(Codes), Goal).
%% with_output_to_chars(:Goal, -Codes, ?Tail) is det.
%
% Run Goal with as once/1. Output written to =current_output=
% is collected in Codes\Tail.
with_output_to_chars(Goal, Codes, Tail) :-
with_output_to(codes(Codes, Tail), Goal).
%% with_output_to_chars(:Goal, -Stream, -Codes, ?Tail) is det.
%
% As with_output_to_chars/2, but Stream is unified with the
% temporary stream.
with_output_to_chars(Goal, Stream, Codes, Tail) :-
with_output_to(codes(Codes, Tail), with_stream(Stream, Goal)).
with_stream(Stream, Goal) :-
current_output(Stream),
call(Goal).
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