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