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yap-6.3/packages/python/python.pl
Vítor Santos Costa 3164ed2d61 doc support
2015-01-04 23:58:23 +00:00

231 lines
6.0 KiB
Prolog

%%% -*- Mode: Prolog; -*-
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Author: Vitor Santos Costa
% E-mail: vsc@dcc.fc.up.pt
% Copyright (C): Universidade do Porto
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% This file is part of the YAP Python Interface
% distributed according to Perl Artistic License
% check LICENSE file for distribution license
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%
:- module(python, [
init_python/0,
end_python/0,
python_command/1,
python_assign/3,
python_import/1,
python/2,
op(100,fy,$),
op(950,fy,:=),
op(950,yfx,:=),
(:=)/2,
(:=)/1
]).
/** <module> python
A C-based Prolog interface to python.
@author Vitor Santos Costa
@version 0:0:5, 2012/10/8
@license Perl Artistic License
*/
/************************************************************************************************************
Python interface
Data types are
Python Prolog
string atoms
numbers numbers
lists lists
tuples t(...)
generic objs __pointer__(Address)
$var refers to the attribute __main__.var
*************************************************************************************************************/
:- use_module(library(shlib)).
:- use_module(library(lists)).
:- use_module(library(apply_macros)).
:- use_module(library(charsio)).
:- dynamic python_mref_cache/2, python_obj_cache/2.
:= F :- python(F,_).
V := F :- var(V), !, python(F,V).
A := F :- python(F, F1), python_assign(A, F1).
python_import(Module) :-
python_do_import(Module, _).
python_do_import(Module, MRef) :-
python_mref_cache(Module, MRef), !.
python_do_import(Module, MRef) :-
python_import(Module, MRef),
assert( python_mref_cache(Module, MRef) ).
fetch_module(M:E, M1, E1, MRef) :-
atom(M),
python_import(M, MRef0),
module_extend(M, E, M1, E1, MRef0, MRef).
%
% extend the module as much as we can.
%
module_extend(M0, M:E, MF, EF, _MRef0, MRef) :-
atom(M),
atom_concat([M0,'.',M], MM),
python_import(MM, MRef1), !,
module_extend(MM, E, MF, EF, MRef1, MRef).
module_extend(M, E, M, E, MRef, MRef).
object_prefix('__obj__'(_)).
object_prefix('$'(_)).
object_prefix('__obj__'(_):_).
object_prefix('$'(_):_).
% from an exp take an object, and its corresponding Prolog representation
descend_exp(V, _Obj, _F, _S) :-
var(V), !,
throw(error(instantiation_error,_)).
descend_exp(Exp, Obj, F, S) :-
object_prefix(Exp),
!,
python_field(Exp, Obj, F, S).
descend_exp(Exp, Obj, F, S) :-
python_mref_cache(_, MObj),
python_field(MObj:Exp, Obj, F, S), !.
descend_exp(Mod:Exp, Obj, F, S) :-
atom(Mod),
python_import(Mod, MObj),
python_field(MObj:Exp, Obj, F, S), !.
python_class(Obj) :-
python_obj_cache(inspect:isclass(_), F),
python_apply(F, isclass(Obj), {}, true).
process_obj(Obj, _, S, Obj, NS, Dict) :-
python_callable(Obj), !,
python_check_args(S, NS, Dict).
process_obj(Obj, _, S, FObj, NS, Dict) :-
python_class(Obj),
descend_object(Obj:'__init__', FObj, _, _),
python_check_args(S, NS, Dict).
python_eval_term(Obj, Obj) :-
var(Obj), !.
python_eval_term('__obj__'(Obj), '__obj__'(Obj)) :- !.
python_eval_term($Name, Obj) :- !,
python_is($Name, Obj).
python_eval_term([H|T], [NH|NT]) :- !,
python_eval_term(H, NH),
python_eval_term(T, NT).
python_eval_term(N, N) :- atomic(N), !.
python_eval_term(Exp, O) :-
descend_exp(Exp, Obj, _Old, S), !,
(functor(S, _, 0) ->
O = Obj
;
python_check_args(S, NS, Dict),
python_apply(Obj, NS, Dict, O)
).
python_eval_term(S, O) :-
python_check_args(S, NS, {}),
python_is(NS, O).
python_check_args(Exp, t, {}) :-
Exp =.. [_,V], var(V), !.
python_check_args(Exp, NExp, Dict) :-
functor(Exp, _, Arity),
arg(Arity, Exp, A), nonvar(A), A = (_=_), !,
Exp =.. [_F|LArgs],
match_args(LArgs, NLArgs, Dict),
NExp =.. [t|NLArgs].
python_check_args(Exp, NExp, {}) :-
Exp =.. [F|L],
maplist(python_eval_term, L, LF),
NExp =.. [F|LF].
% in case it is __init__ from __new__
splice_class(Ref, Ref, ArgNames, ArgNames) :- !.
splice_class(_FRef, _Ref, [_|ArgNames], ArgNames).
match_args([], [], {}).
match_args([V=A|LArgs], [], Dict) :- !,
match_named_args([V=A|LArgs], Map),
map_to_dict(Map, Dict).
match_args([A|LArgs], [VA|NLArgs], Dict) :-
python_eval_term(A, VA),
match_args(LArgs, NLArgs, Dict).
match_named_args([], []).
match_named_args([K=A|LArgs], [K=VA|Map]) :-
python_eval_term(A, VA),
match_named_args(LArgs, Map).
map_to_dict([X=V], {X:V}) :- !.
map_to_dict([X=V|Map], {X:V,NDict}) :-
map_to_dict(Map, {NDict}).
match_from_anames([K|_ArgNames], K, VA, [_|Defaults], [VA|Defaults]) :- !.
match_from_anames([_|ArgNames], K, VA, [V|Defaults], [V|NDefaults]) :-
match_from_anames(ArgNames, K, VA, Defaults, NDefaults).
fetch_args(FRef, Args, Kwd, Defaults) :-
FRef = '__obj__'(_), !,
%python_mref_cache('inspect', M),
python_obj_cache(inspect:getargspec(_), F),
python_apply(F, getargspec(FRef), {}, ExtraArgs),
ExtraArgs=t(Args, _, Kwd, Defaults).
fetch_args(_, []).
python(Obj, Out) :-
python_eval_term(Obj, Out).
python_command(Cmd) :-
python_run_command(Cmd).
start_python :-
init_python,
python_main_module(MRef),
assert(python_mref_cache('__main__', MRef)),
python_command('import sys'),
python_import('inspect'),
python_mref_cache(inspect, InspRef),
python_field(InspRef:isclass(_), IsClass, _, _),
assert(python_obj_cache(inspect:isclass(_), IsClass)),
python_field(InspRef:getargspec(_), GetArgSpec, _, _),
assert(python_obj_cache(inspect:getargspec(_), GetArgSpec)),
at_halt(end_python).
add_cwd_to_python :-
unix(getcwd(Dir)),
atom_concat(['sys.path.append(\"',Dir,'\")'], Command),
python_command(Command),
python_command("sys.argv = [\"yap\"]").
% done
python_assign(Name, Exp, '$'(Name)) :-
python_assign(Name, Exp).
:- initialization( use_foreign_library(foreign(python)), now ).
:- initialization(start_python, now).
:- initialization(add_cwd_to_python).