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yap-6.3/library/dialect/swi.yap
Vitor Santos Costa 1c293a9af4 docs
2018-04-27 13:01:08 +01:00

329 lines
7.1 KiB
Prolog

% SWI emulation.
% written in an on-demand basis.
%%
%% @file dialect/swi.yap
%%
%% @defgroup SWI Compatibility with SWI-Prolog and Other Prolog systems
%% @{
%% @ingroup YAPProgramming
/**
@defgroup System SWI Dialect Support
@ingroup SWI
@{
This library provides a number of SWI-Prolog builtins that are not by
default in YAP. This support is loaded with the
~~~~~
expects_dialect(swi)
~~~~~
command.
*/
/** @pred time_file(+ _File_,- _Time_)
Unify the last modification time of _File_ with
_Time_. _Time_ is a floating point number expressing the seconds
elapsed since Jan 1, 1970.
*/
/** @pred concat_atom(+ _List_,- _Atom_)
_List_ is a list of atoms, integers or floating point numbers. Succeeds
if _Atom_ can be unified with the concatenated elements of _List_. If
_List_ has exactly 2 elements it is equivalent to `atom_concat/3`,
allowing for variables in the list.
*/
:- module(system, [concat_atom/2,
concat_atom/3,
read_clause/1,
chdir/1,
compile_aux_clauses/1,
convert_time/2,
convert_time/8,
'$declare_module'/5,
'$set_predicate_attribute'/3,
stamp_date_time/3,
date_time_stamp/2,
time_file/2,
flag/3,
require/1,
normalize_space/2,
current_flag/1
]).
:- reexport(library(charsio),[
write_to_chars/2,
read_from_chars/2
]).
:- reexport(library(lists),[append/2,
append/3,
delete/3,
member/2,
flatten/2,
intersection/3,
last/2,
memberchk/2,
max_list/2,
min_list/2,
nextto/3,
permutation/2,
reverse/2,
select/3,
selectchk/3,
sublist/2,
sumlist/2,
nth1/4,
nth0/4,
nth1/3,
nth0/3]).
:- reexport(library(apply),[maplist/2,
maplist/3,
maplist/4,
maplist/5,
include/3,
exclude/3,
partition/4,
partition/5
]).
:- reexport(library(system),
[datime/1,
mktime/2,
file_property/2,
delete_file/1]).
:- reexport(library(arg),
[genarg/3]).
:- reexport(library(apply_macros),
[]).
:- reexport(library(terms),
[subsumes/2,
subsumes_chk/2,
term_hash/2,
unifiable/3,
cyclic_term/1,
variant/2]).
:- source.
:- style_check(all).
:- yap_flag(unknown,error).
:- yap_flag(open_expands_filename,false).
:- yap_flag(autoload,true).
:- set_prolog_flag(user_flags,silent).
% Time is given as a float in SWI-Prolog.
swi_get_time(FSecs) :- datime(Datime), mktime(Datime, Secs), FSecs is Secs*1.0.
goal_expansion(atom_concat(A,B),atomic_concat(A,B)).
/** @pred atom_concat(? _A1_,? _A2_,? _A12_) is iso
The predicate holds when the third argument unifies with an atom, and
the first and second unify with atoms such that their representations
concatenated are the representation for _A12_.
If _A1_ and _A2_ are unbound, the built-in will find all the atoms
that concatenated give _A12_.
*/
goal_expansion(atom_concat(A,B,C),atomic_concat(A,B,C)).
%goal_expansion(arg(A,_,_),_) :- nonvar(A), !, fail.
goal_expansion(arg(A,B,C),arg:genarg(A,B,C)).
% make sure we also use
:- user:library_directory(X),
atom(X),
atom_concat([X,'/dialect/swi'],SwiDir),
\+ user:library_directory(SwiDir),
asserta(user:library_directory(SwiDir)),
fail
;
true.
:- multifile
user:file_search_path/2.
:- dynamic
user:file_search_path/2.
/** @pred concat_atom(? _List_,+ _Separator_,? _Atom_)
Creates an atom just like concat_atom/2, but inserts _Separator_
between each pair of atoms. For example:
~~~~~
?- concat_atom([gnu, gnat], ', ', A).
A = 'gnu, gnat'
~~~~~
(Unimplemented) This predicate can also be used to split atoms by
instantiating _Separator_ and _Atom_:
~~~~~
?- concat_atom(L, -, 'gnu-gnat').
L = [gnu, gnat]
~~~~~
*/
concat_atom([A|List], Separator, New) :- var(List), !,
atom_codes(Separator,[C]),
atom_codes(New, NewChars),
split_atom_by_chars(NewChars,C,L,L,A,List).
concat_atom(List, Separator, New) :-
add_separator_to_list(List, Separator, NewList),
atomic_concat(NewList, New).
split_atom_by_chars([],_,[],L,A,[]):-
atom_codes(A,L).
split_atom_by_chars([C|NewChars],C,[],L,A,[NA|Atoms]) :- !,
atom_codes(A,L),
split_atom_by_chars(NewChars,C,NL,NL,NA,Atoms).
split_atom_by_chars([C1|NewChars],C,[C1|LF],LAtom,Atom,Atoms) :-
split_atom_by_chars(NewChars,C,LF,LAtom,Atom,Atoms).
add_separator_to_list([], _, []).
add_separator_to_list([T], _, [T]) :- !.
add_separator_to_list([H|T], Separator, [H,Separator|NT]) :-
add_separator_to_list(T, Separator, NT).
concat_atom(List, New) :-
atomic_concat(List, New).
bindings_message(V) -->
{ cvt_bindings(V, Bindings) },
prolog:message(query(_YesNo,Bindings)), !.
cvt_bindings([],[]).
cvt_bindings([[Name|Value]|L],[AName=Value|Bindings]) :-
atom_codes(AName, Name),
cvt_bindings(L,Bindings).
/** @pred chdir(+ _Dir_)
Compatibility predicate. New code should use working_directory/2.
*/
chdir(X) :- cd(X).
%% convert_time(+Stamp, -String)
%
% Convert a time-stamp as obtained though get_time/1 into a textual
% representation using the C-library function ctime(). The value is
% returned as a SWI-Prolog string object (see section 4.23). See
% also convert_time/8.
%
% @deprecated Use format_time/3.
convert_time(Stamp, String) :-
format_time(string(String), '%+', Stamp).
%% convert_time(+Stamp, -Y, -Mon, -Day, -Hour, -Min, -Sec, -MilliSec)
%
% Convert a time stamp, provided by get_time/1, time_file/2,
% etc. Year is unified with the year, Month with the month number
% (January is 1), Day with the day of the month (starting with 1),
% Hour with the hour of the day (0--23), Minute with the minute
% (0--59). Second with the second (0--59) and MilliSecond with the
% milliseconds (0--999). Note that the latter might not be accurate
% or might always be 0, depending on the timing capabilities of the
% system. See also convert_time/2.
%
% @deprecated Use stamp_date_time/3.
convert_time(Stamp, Y, Mon, Day, Hour, Min, Sec, MilliSec) :-
stamp_date_time(Stamp,
date(Y, Mon, Day,
Hour, Min, FSec,
_, _, _),
local),
Sec is integer(float_integer_part(FSec)),
MilliSec is integer(float_fractional_part(FSec)*1000).
compile_aux_clauses([]).
compile_aux_clauses([(:- G)|Cls]) :- !,
prolog_load_context(module, M),
once(M:G),
compile_aux_clauses(Cls).
compile_aux_clauses([Cl|Cls]) :-
prolog_load_context(module, M),
assert_static(M:Cl),
compile_aux_clauses(Cls).
flag(Key, Old, New) :-
recorded(Key, Old, R), !,
(
Old \== New
->
erase(R),
recorda(Key, New, _)
;
true
).
flag(Key, 0, New) :-
functor(Key, N, Ar),
functor(K, N, Ar),
assert(flag(K)),
recorda(K, New, _).
current_flag(Key) :-
flag(Key).
require(F) :-
must_be(list, F),
% notice that this must be used as a declaration.
prolog_load_context(module, Mod),
required_predicates(F, Mod).
required_predicates([], _).
required_predicates([F|Fs], M) :-
required_predicate(F, M),
required_predicates(Fs, M).
required_predicate(Na/Ar, M) :-
functor(G, Na, Ar),
(
predicate_property(M:G, _) ->
true
;
autoloader:find_predicate(G, _)
).
/**
@}
@}
*/