183 lines
4.3 KiB
Prolog
183 lines
4.3 KiB
Prolog
%%% -*- Mode: Prolog; -*-
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Author: Vitor Santos Costa
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% E-mail: vsc@dcc.fc.up.pt
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% Copyright (C): Universidade do Porto
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% This file is part of the YAP Python Interface
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% distributed according to Perl Artistic License
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% check LICENSE file for distribution license
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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/** <module> python
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A C-based Prolog interface to python.
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@author Vitor Santos Costa
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@version 0:0:5, 2012/10/8
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@license Perl Artistic License
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*/
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%%%
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:- module(python, [
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init_python/0,
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end_python/0,
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python_command/1,
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python_assign/3,
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python_import/1,
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python/2,
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op(100,fy,$),
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op(950,fy,:=),
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op(950,yfx,:=),
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(:=)/2,
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(:=)/1
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]).
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/************************************************************************************************************
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Python interface
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Data types are
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Python Prolog
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string atoms
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numbers numbers
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lists lists
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tuples t(...)
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generic objs __pointer__(Address)
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$var refers to the attribute __main__.var
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*************************************************************************************************************/
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:- use_module(library(shlib)).
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:- use_module(library(lists)).
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:- use_module(library(apply_macros)).
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:- use_module(library(charsio)).
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:- dynamic python_mref_cache/2.
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:= F :- python(F,_).
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V := F :- var(V), !, python(F,V).
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A := F :- python(F, F1), python_assign(A, F1).
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python_import(Module) :-
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python_do_import(Module, _).
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python_do_import(Module, MRef) :-
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python_mref_cache(Module, MRef), !.
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python_do_import(Module, MRef) :-
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python_import(Module, MRef),
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assert( python_mref_cache(Module, MRef) ).
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fetch_module(M:E, M1, E1, MRef) :-
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atom(M),
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python_import(M, MRef0),
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module_extend(M, E, M1, E1, MRef0, MRef).
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%
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% extend the module as much as we can.
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%
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module_extend(M0, M:E, MF, EF, MRef0, MRef) :-
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atom(M),
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atom_concat([M0,'.',M], MM),
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python_import(MM, MRef1), !,
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module_extend(MM, E, MF, EF, MRef1, MRef).
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module_extend(M, E, M, E, MRef, MRef).
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% given an object, detect its len method
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python_eval_term(Expression, O) :-
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fetch_module(Expression, Module, Exp, MRef), !,
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(
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atom(Exp)
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->
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python_access(MRef, Exp, O)
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;
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Exp = Obj:Method
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->
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python_access(MRef, Exp, O)
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;
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functor(Exp, F, _),
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python_f(MRef, F, FRef),
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python_check_args(FRef, Exp, NExp),
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python_apply(FRef, NExp, O)
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).
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python_eval_term(Obj:Field, O) :-
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python_access(Obj, Field, O).
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python_check_args(FRef, Exp, NExp) :-
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functor(Exp, _, Arity),
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arg(Arity, Exp, _=_), !,
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fetch_args(FRef, Dict),
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Exp =.. [F|LArgs],
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match_args(LArgs, Dict, NLArgs, _),
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NExp =.. [F|NLArgs].
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python_check_args(FRef, Exp, Exp).
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fetch_args(FRef, Args) :-
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python_import('inspect', M),
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python_f(M, getargspec, F),
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python_apply(F, getargspec(FRef), Args),
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ExtraArgs=t(Args, _, _, _).
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match_args([], _, [], ok).
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match_args([A=V|LArgs], Dict, [I=V|NLArgs], OK) :-
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match_args(LArgs, Dict, NLArgs, ok), !,
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( nth0(I, Dict, A) -> true ; throw(type_error(argument(A=V))) ).
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match_args([A|LArgs], Dict, [A|NLArgs], not_ok) :-
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match_args(LArgs, Dict, NLArgs, _).
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python(Obj, Out) :-
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python_eval_term(Obj, Out), !.
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python(Obj, OArg) :-
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python_do_is(Obj, Obj1),
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python_is(Obj1, OArg).
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python_do_is(A+B, NA+NB) :- !,
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python_do_is(A, NA),
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python_do_is(B, NB).
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python_do_is(A-B, NA-NB) :- !,
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python_do_is(A, NA),
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python_do_is(B, NB).
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python_do_is(A*B, NA*NB) :- !,
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python_do_is(A, NA),
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python_do_is(B, NB).
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python_do_is(A/B, NA/NB) :- !,
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python_do_is(A, NA),
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python_do_is(B, NB).
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python_do_is(A, NA) :-
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python_eval_term(A, NA), !.
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python_do_is(A, A).
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python_command(Cmd) :-
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python_run_command(Cmd).
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start_python :-
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use_foreign_library(foreign(python)),
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init_python,
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python_command('import sys'),
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python_command('import inspect').
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add_cwd_to_python :-
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unix(getcwd(Dir)),
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atom_concat(['sys.path.append(\"',Dir,'\")'], Command),
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python_command(Command),
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python_command("sys.argv = [\"yap\"]").
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% done
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python_assign(Name, Exp, '$'(Name)) :-
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python_assign(Name, Exp).
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:- initialization(start_python, now).
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:- initialization(add_cwd_to_python).
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