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daaaf52338
yap-6.3/pl/yio.yap
Vítor Santos Costa a8c77d2609 fix string_concat/2
2014-04-09 12:39:29 +01:00

358 lines
9.4 KiB
Prolog
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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: yio.yap *
* Last rev: *
* mods: *
* comments: Input output predicates *
* *
*************************************************************************/
:- system_module( '$_yio', [at_end_of_line/0,
at_end_of_line/1,
consult_depth/1,
current_char_conversion/2,
current_line_number/1,
current_line_number/2,
current_stream/3,
display/1,
display/2,
exists/1,
fileerrors/0,
format/1,
nofileerrors/0,
open_pipe_streams/2,
prolog_file_name/2,
read/1,
read/2,
sformat/3,
socket/2,
socket/4,
socket_connect/3,
stream_position/2,
stream_position/3,
stream_position_data/3,
ttyget/1,
ttyget0/1,
ttynl/0,
ttyput/1,
ttyskip/1,
write_depth/2,
writeln/1], ['$default_expand'/1,
'$extend_file_search_path'/1,
'$set_default_expand'/1]).
:- use_system_module( '$_boot', ['$system_catch'/4]).
:- use_system_module( '$_errors', ['$do_error'/2]).
/* stream predicates */
/* check whether a list of options is valid */
'$check_io_opts'(V,G) :- var(V), !,
'$do_error'(instantiation_error,G).
'$check_io_opts'([],_) :- !.
'$check_io_opts'([H|_],G) :- var(H), !,
'$do_error'(instantiation_error,G).
'$check_io_opts'([Opt|T],G) :- !,
'$check_opt'(G,Opt,G),
'$check_io_opts'(T,G).
'$check_io_opts'(T,G) :-
'$do_error'(type_error(list,T),G).
'$check_opt'(read_term(_,_),Opt,G) :-
'$check_opt_read'(Opt, G).
'$check_opt'(stream_property(_,_),Opt,G) :-
'$check_opt_sp'(Opt, G).
'$check_opt_read'(variables(_), _) :- !.
'$check_opt_read'(variable_names(_), _) :- !.
'$check_opt_read'(singletons(_), _) :- !.
'$check_opt_read'(syntax_errors(T), G) :- !,
'$check_read_syntax_errors_arg'(T, G).
'$check_opt_read'(term_position(_), _) :- !.
'$check_opt_read'(term_position(_), _) :- !.
'$check_opt_read'(comments(_), _) :- !.
'$check_opt_read'(module(_), _) :- !.
'$check_opt_read'(A, G) :-
'$do_error'(domain_error(read_option,A),G).
'$check_opt_sp'(file_name(_), _) :- !.
'$check_opt_sp'(mode(_), _) :- !.
'$check_opt_sp'(input, _) :- !.
'$check_opt_sp'(output, _) :- !.
'$check_opt_sp'(alias(_), _) :- !.
'$check_opt_sp'(position(_), _) :- !.
'$check_opt_sp'(end_of_stream(_), _) :- !.
'$check_opt_sp'(eof_action(_), _) :- !.
'$check_opt_sp'(reposition(_), _) :- !.
'$check_opt_sp'(type(_), _) :- !.
'$check_opt_sp'(bom(_), _) :- !.
'$check_opt_sp'(encoding(_), _) :- !.
'$check_opt_sp'(representation_errors(_), _) :- !.
'$check_opt_sp'(A, G) :-
'$do_error'(domain_error(stream_property,A),G).
'$check_read_syntax_errors_arg'(X, G) :- var(X), !,
'$do_error'(instantiation_error,G).
'$check_read_syntax_errors_arg'(dec10,_) :- !.
'$check_read_syntax_errors_arg'(fail,_) :- !.
'$check_read_syntax_errors_arg'(error,_) :- !.
'$check_read_syntax_errors_arg'(quiet,_) :- !.
'$check_read_syntax_errors_arg'(X,G) :-
'$do_error'(domain_error(read_option,syntax_errors(X)),G).
'$check_boolean'(X, _, _, G) :- var(X), !,
'$do_error'(instantiation_error,G).
'$check_boolean'(true,_,_,_) :- !.
'$check_boolean'(false,_,_,_) :- !.
'$check_boolean'(X,B,T,G) :-
'$do_error'(domain_error(B,T),G).
socket(Domain, Sock) :-
(
'$undefined'(ip_socket(_,_),yap_sockets)
->
load_files(library(sockets), [silent(true),if(not_loaded)])
;
true
),
yap_sockets:ip_socket(Domain, Sock).
socket(Domain, Type, Protocol, Sock) :-
(
'$undefined'(ip_socket(_,_),yap_sockets)
->
load_files(library(sockets), [silent(true),if(not_loaded)])
;
true
),
yap_sockets:ip_socket(Domain, Type, Protocol, Sock).
socket_connect(Sock, Host, Read) :-
(
'$undefined'(ip_socket(_,_),yap_sockets)
->
load_files(library(sockets), [silent(true),if(not_loaded)])
;
true
),
yap_sockets:ip_socket(Domain, Type, Protocol, Sock).
open_pipe_streams(Read, Write) :-
(
'$undefined'(pipe(_,_),unix)
->
load_files(library(unix), [silent(true),if(not_loaded)])
;
true
),
unix:pipe(Read, Write),
yap_flag(encoding, X),
set_stream(Read, encoding(X) ),
set_stream(Write, encoding(X) ).
fileerrors :- '$swi_set_prolog_flag'(fileerrors, true).
nofileerrors :- '$swi_set_prolog_flag'(fileerrors, false).
exists(F) :-
absolute_file_name(F, _, [file_errors(fail),access(exist),expand(true)]).
/* Term IO */
read(T) :-
read_term(T, []).
read(Stream,T) :-
read_term(Stream, T, []).
/* meaning of flags for '$write' is
1 quote illegal atoms
2 ignore operator declarations
4 output '$VAR'(N) terms as A, B, C, ...
8 use portray(_)
flags are defined in yapio.h
*/
display(T) :-
current_output(Out),
write_term(Out, T, [ignore_ops(true)]).
display(Stream, T) :-
write_term(Term, T, [ignore_ops(true)]).
format(T) :-
format(T, []).
writeln(T) :-
write(T),
nl.
/* interface to user portray */
'$portray'(T) :-
\+ '$undefined'(portray(_),user),
'$system_catch'(call(portray(T)),user,Error,user:'$Error'(Error)), !,
set_value('$portray',true), fail.
'$portray'(_) :- set_value('$portray',false), fail.
/* character I/O */
ttyget(N) :- get(user_input,N).
ttyget0(N) :- get0(user_input,N).
ttyskip(N) :- N1 is N, '$skip'(user_input,N1).
ttyput(N) :- N1 is N, put(user_output,N1).
ttynl :- nl(user_output).
current_line_number(N) :-
current_input(Stream),
line_count(Stream, N).
current_line_number(Stream,N) :-
line_count(Stream, N).
stream_position(Stream, Position) :-
stream_property(Stream, position(Position)).
stream_position(Stream, Position, NewPosition) :-
stream_property(Stream, position(Position)),
set_stream_position(Stream, NewPosition).
at_end_of_line :-
current_input(S),
at_end_of_line(S).
at_end_of_line(S) :-
current_stream(S, end_of_stream(past)), !.
at_end_of_line(S) :-
peek(S,N), ( N = 10 -> true ; N = -1).
consult_depth(LV) :- '$show_consult_level'(LV).
current_char_conversion(X,Y) :-
var(X), !,
'$all_char_conversions'(List),
'$fetch_char_conversion'(List,X,Y).
current_char_conversion(X,Y) :-
'$current_char_conversion'(X,Y).
'$fetch_char_conversion'([X,Y|_],X,Y).
'$fetch_char_conversion'([_,_|List],X,Y) :-
'$fetch_char_conversion'(List,X,Y).
current_stream(File, Mode, Stream) :-
stream_property(Stream, mode(Mode)),
'$stream_name'(Stream, File).
'$stream_name'(Stream, File) :-
stream_property(Stream, file_name(File)), !.
'$stream_name'(Stream, file_no(File)) :-
stream_property(Stream, file_no(File)), !.
'$stream_name'(Stream, Stream).
'$extend_file_search_path'(P) :-
atom_codes(P,S),
'$env_separator'(ES),
'$split_for_path'(S,0'=,ES,Paths), %'
'$add_file_search_paths'(Paths).
'$split_for_path'([], _, _, []).
'$split_for_path'(S, S1, S2, [A1=A2|R]) :-
'$fetch_first_path'(S, S1, A1, SR1),
'$fetch_second_path'(SR1, S2, A2, SR),
'$split_for_path'(SR, S1, S2, R) .
'$fetch_first_path'([S1|SR],S1,[],SR) :- !.
'$fetch_first_path'([C|S],S1,[C|F],SR) :-
'$fetch_first_path'(S,S1,F,SR).
'$fetch_second_path'([],_,[],[]).
'$fetch_second_path'([S1|SR],S1,[],SR) :- !.
'$fetch_second_path'([C|S],S1,[C|A2],SR) :-
'$fetch_second_path'(S,S1,A2,SR).
'$add_file_search_paths'([]).
'$add_file_search_paths'([NS=DS|Paths]) :-
atom_codes(N,NS),
atom_codes(D,DS),
assert(user:file_search_path(N,D)),
'$add_file_search_paths'(Paths).
'$format@'(Goal,Out) :-
with_output_to(codes(Out), Goal).
sformat(String, Form, Args) :-
format(codes(String, []), Form, Args).
write_depth(T,L) :- write_depth(T,L,_).
%% stream_position_data(?Field, +Pos, ?Date)
%
% Extract values from stream position objects. '$stream_position' is
% of the format '$stream_position'(Byte, Char, Line, LinePos)
stream_position_data(Prop, Term, Value) :-
nonvar(Prop), !,
( '$stream_position_field'(Prop, Pos)
-> arg(Pos, Term, Value)
; throw(error(domain_error(stream_position_data, Prop)))
).
stream_position_data(Prop, Term, Value) :-
'$stream_position_field'(Prop, Pos),
arg(Pos, Term, Value).
'$stream_position_field'(char_count, 1).
'$stream_position_field'(line_count, 2).
'$stream_position_field'(line_position, 3).
'$stream_position_field'(byte_count, 4).
'$default_expand'(Expand) :-
get_value('$open_expands_filename',Expand).
'$set_default_expand'(true) :- !,
set_value('$open_expands_filename',true).
'$set_default_expand'(false) :- !,
set_value('$open_expands_filename',false).
'$set_default_expand'(V) :- !,
'$do_error'(domain_error(flag_value,V),yap_flag(open_expands_file_name,X)).
prolog_file_name(File, PrologFileName) :-
var(File), !,
'$do_error'(instantiation_error, prolog_file_name(File, PrologFileName)).
prolog_file_name(user, Out) :- !, Out = user.
prolog_file_name(File, PrologFileName) :-
atom(File), !,
operating_system_support:true_file_name(File, PrologFileName).
prolog_file_name(File, PrologFileName) :-
'$do_error'(type_error(atom,T), prolog_file_name(File, PrologFileName)).
'$codes_to_chars'(String0, String, String0) :- String0 == String, !.
'$codes_to_chars'(String0, [Code|String], [Char|Chars]) :-
atom_codes(Char, [Code]),
'$codes_to_chars'(String0, String, Chars).
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