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yap-6.3/packages/python/py2pl.c
2017-08-21 12:36:48 +01:00

363 lines
10 KiB
C

#include "py4yap.h"
#include <frameobject.h>
void YAPPy_ThrowError__(const char *file, const char *function, int lineno,
yap_error_number type, term_t where, ...) {
va_list ap;
char tmpbuf[MAXPATHLEN];
YAP_Term wheret = YAP_GetFromSlot(where);
PyObject *ptype;
if ((ptype = PyErr_Occurred()) == NULL) {
PyErr_Print();
}
va_start(ap, where);
char *format = va_arg(ap, char *);
if (format != NULL) {
#if HAVE_VSNPRINTF
(void)vsnprintf(tmpbuf, MAXPATHLEN - 1, format, ap);
#else
(void)vsprintf(tnpbuf, format, ap);
#endif
// fprintf(stderr, "warning: ");
Yap_ThrowError__(file, function, lineno, type, wheret, tmpbuf);
} else {
Yap_ThrowError__(file, function, lineno, type, wheret);
}
}
static foreign_t repr_term(PyObject *pVal, term_t t) {
term_t to = PL_new_term_ref(), t1 = PL_new_term_ref();
PL_put_pointer(t1, pVal);
PL_cons_functor(to, FUNCTOR_pointer1, t1);
Py_INCREF(pVal);
return PL_unify(t, to);
}
foreign_t assign_to_symbol(term_t t, PyObject *e);
foreign_t assign_to_symbol(term_t t, PyObject *e) {
char *s = NULL;
if (!PL_get_atom_chars(t, &s)) {
return false;
}
PyObject *dic;
if (!lookupPySymbol(s, NULL, &dic))
dic = py_Main;
return PyObject_SetAttrString(dic, s, e) == 0;
}
foreign_t python_to_term(PyObject *pVal, term_t t) {
bool rc = true;
term_t to = PL_new_term_ref();
// fputs(" <<*** ",stderr); PyObject_Print(pVal,stderr,0);
// fputs("<<***\n",stderr);
if (pVal == Py_None) {
// fputs("<<*** ",stderr);Yap_DebugPlWrite(YAP_GetFromSlot(t)); fputs("
// >>***\n",stderr);
rc = PL_unify_atom(t, ATOM_none);
// fputs("<<*** ",stderr);Yap_DebugPlWrite(YAP_GetFromSlot(t)); fputs("
// >>***\n",stderr);
} else if (PyBool_Check(pVal)) {
rc = rc && PL_unify_bool(t, PyObject_IsTrue(pVal));
} else if (PyLong_Check(pVal)) {
rc = rc && PL_unify_int64(t, PyLong_AsLong(pVal));
#if PY_MAJOR_VERSION < 3
} else if (PyInt_Check(pVal)) {
rc = rc && PL_unify_int64(t, PyInt_AsLong(pVal));
#endif
} else if (PyFloat_Check(pVal)) {
rc = rc && PL_unify_float(t, PyFloat_AsDouble(pVal));
} else if (PyComplex_Check(pVal)) {
term_t t1 = PL_new_term_ref(), t2 = PL_new_term_ref();
if (!PL_put_float(t1, PyComplex_RealAsDouble(pVal)) ||
!PL_put_float(t2, PyComplex_ImagAsDouble(pVal)) ||
!PL_cons_functor(to, FUNCTOR_complex2, t1, t2)) {
rc = false;
} else {
rc = rc && PL_unify(t, to);
}
} else if (PyUnicode_Check(pVal)) {
atom_t tmp_atom;
#if PY_MAJOR_VERSION < 3
size_t sz = PyUnicode_GetSize(pVal) + 1;
wchar_t *ptr = malloc(sizeof(wchar_t) * sz);
sz = PyUnicode_AsWideChar((PyUnicodeObject *)pVal, ptr, sz - 1);
tmp_atom = PL_new_atom_wchars(sz, ptr);
free(ptr);
#else
const char *s = PyUnicode_AsUTF8(pVal);
tmp_atom = PL_new_atom(s);
#endif
rc = rc && PL_unify_atom(t, tmp_atom);
} else if (PyByteArray_Check(pVal)) {
atom_t tmp_atom = PL_new_atom(PyByteArray_AsString(pVal));
rc = rc && PL_unify_atom(t, tmp_atom);
#if PY_MAJOR_VERSION < 3
} else if (PyString_Check(pVal)) {
atom_t tmp_atom = PL_new_atom(PyString_AsString(pVal));
rc = rc && PL_unify_atom(t, tmp_atom);
#endif
} else if (PyTuple_Check(pVal)) {
Py_ssize_t i, sz = PyTuple_Size(pVal);
functor_t f;
const char *s;
if (sz == 0) {
rc = rc && PL_unify_atom(t, ATOM_brackets);
} else {
if ((s = (Py_TYPE(pVal)->tp_name))) {
if (!strcmp(s, "v")) {
pVal = PyTuple_GetItem(pVal, 0);
if (pVal == NULL) {
pVal = Py_None;
PyErr_Clear();
}
term_t v = YAP_InitSlot(PyLong_AsLong(pVal));
return PL_unify(v, t);
}
if (s[0] == '$') {
char *ns = malloc(strlen(s) + 5);
strcpy(ns, "__");
strcat(ns, s + 1);
strcat(ns, "__");
f = PL_new_functor(PL_new_atom(ns), sz);
} else {
f = PL_new_functor(PL_new_atom(s), sz);
}
} else {
f = PL_new_functor(ATOM_t, sz);
}
if (PL_unify_functor(t, f)) {
for (i = 0; i < sz; i++) {
if (!PL_get_arg(i + 1, t, to))
rc = false;
PyObject *p = PyTuple_GetItem(pVal, i);
if (p == NULL) {
PyErr_Clear();
p = Py_None;
}
rc = rc && python_to_term(p, to);
}
} else {
rc = false;
}
// fputs(" ||*** ",stderr); Yap_DebugPlWrite(YAP_GetFromSlot(t)); fputs("
// ||***\n",stderr);
}
} else if (PyList_Check(pVal)) {
Py_ssize_t i, sz = PyList_GET_SIZE(pVal);
for (i = 0; i < sz; i++) {
PyObject *obj;
rc = rc && PL_unify_list(t, to, t);
if ((obj = PyList_GetItem(pVal, i - 1)) == NULL) {
obj = Py_None;
}
rc = rc && python_to_term(obj, to);
if (!rc)
return false;
}
return rc && PL_unify_nil(t);
// fputs("[***] ", stderr);
// Yap_DebugPlWrite(yt); fputs("[***]\n", stderr);
} else if (PyDict_Check(pVal)) {
Py_ssize_t pos = 0;
term_t to = PL_new_term_ref(), ti = to;
int left = PyDict_Size(pVal);
PyObject *key, *value;
if (left == 0) {
rc = rc && PL_unify_atom(t, ATOM_curly_brackets);
} else {
while (PyDict_Next(pVal, &pos, &key, &value)) {
term_t tkey = PL_new_term_ref(), tval = PL_new_term_ref(), tint,
tnew = PL_new_term_ref();
/* do something interesting with the values... */
if (!python_to_term(key, tkey)) {
continue;
}
if (!python_to_term(value, tval)) {
continue;
}
/* reuse */
tint = tkey;
if (!PL_cons_functor(tint, FUNCTOR_colon2, tkey, tval)) {
rc = false;
continue;
}
if (--left) {
if (!PL_cons_functor(tint, FUNCTOR_comma2, tint, tnew))
PL_reset_term_refs(tkey);
rc = false;
}
if (!PL_unify(ti, tint)) {
rc = false;
}
ti = tnew;
PL_reset_term_refs(tkey);
}
rc = rc && PL_unify(t, to);
}
} else {
rc = rc && repr_term(pVal, t);
}
PL_reset_term_refs(to);
return rc;
}
X_API YAP_Term pythonToYAP(PyObject *pVal) {
term_t t = PL_new_term_ref();
if (pVal == NULL || !python_to_term(pVal, t)) {
PL_reset_term_refs(t);
return 0;
}
YAP_Term tt = YAP_GetFromSlot(t);
PL_reset_term_refs(t);
Py_DECREF(pVal);
return tt;
}
PyObject *py_Local, *py_Global;
/**
* assigns the Python RHS to a Prolog term LHS, ie LHS = RHS
*
* @param root Python environment
* @param t left hand side, in Prolog, may be
* - a Prolog variable, exports the term to Prolog, A <- RHS
* - Python variable A, A <- RHS
* - Python variable $A, A <- RHS
* - Python string "A", A <- RHS
* - Python array range
* @param e the right-hand side
*
* @return -1 on failure.
*
* Note that this is an auxiliary routine to the Prolog
*python_assign.
*/
bool python_assign(term_t t, PyObject *exp, PyObject *context) {
context = find_obj(context, t, false);
// Yap_DebugPlWriteln(yt);
switch (PL_term_type(t)) {
case PL_VARIABLE: {
if (context == NULL) // prevent a.V= N*N[N-1]
return python_to_term(exp, t);
}
case PL_ATOM: {
char *s = NULL;
PL_get_atom_chars(t, &s);
if (!context)
context = py_Main;
if (PyObject_SetAttrString(context, s, exp) == 0)
return true;
PyErr_Print();
return false;
}
case PL_STRING:
case PL_INTEGER:
case PL_FLOAT:
// domain or type erro?
return false;
default: {
term_t tail = PL_new_term_ref(), arg = PL_new_term_ref();
size_t len, i;
if (PL_is_pair(t)) {
if (PL_skip_list(t, tail, &len) &&
PL_get_nil(tail)) { // true list
bool o = true;
if (PySequence_Check(exp) && PySequence_Length(exp) == len)
for (i = 0; i < len; i++) {
PyObject *p;
if (!PL_get_list(t, arg, t)) {
PL_reset_term_refs(tail);
o = false;
p = Py_None;
}
if ((p = PySequence_GetItem(exp, i)) == NULL)
p = Py_None;
if (!python_assign(arg, p, context)) {
PL_reset_term_refs(tail);
o = false;
}
}
}
} else {
functor_t fun;
if (!PL_get_functor(t, &fun)) {
PL_reset_term_refs(tail);
return false;
}
if (fun == FUNCTOR_sqbrackets2) {
// tail is the object o
if (!PL_get_arg(2, t, tail)) {
PL_reset_term_refs(tail);
return false;
}
PyObject *o = term_to_python(tail, true, context, false);
// t now refers to the index
if (!PL_get_arg(1, t, t) || !PL_get_list(t, t, tail) ||
!PL_get_nil(tail)) {
PL_reset_term_refs(tail);
return false;
}
PyObject *i = term_to_python(t, true, NULL, false);
// check numeric
if (PySequence_Check(o) && PyLong_Check(i)) {
long int j;
j = PyLong_AsLong(i);
return PySequence_SetItem(o, j, exp) == 0;
}
#if PY_MAJOR_VERSION < 3
if (PySequence_Check(o) && PyInt_Check(i)) {
long int j;
j = PyInt_AsLong(i);
return PySequence_SetItem(o, i, exp) == 0;
}
#endif
if (PyDict_Check(o)) {
if (PyDict_SetItem(o, i, exp) == 0)
return true;
}
if (PyObject_SetAttr(o, i, exp) == 0) {
return true;
}
} else {
atom_t s;
int n, i;
PL_get_name_arity(t, &s, &n);
PyObject *o = term_to_python(t, true, context, true);
if (PySequence_Check(o) && PySequence_Length(o) == n) {
for (i = 1; i <= n; i++) {
PyObject *p;
if (!PL_get_arg(i, t, arg)) {
PL_reset_term_refs(tail);
o = false;
p = Py_None;
}
if ((p = PySequence_GetItem(exp, i - 1)) == NULL)
p = Py_None;
else if (!python_assign(arg, p, NULL)) {
PL_reset_term_refs(tail);
o = NULL;
}
}
return true;
}
}
}
PL_reset_term_refs(tail);
}
return NULL;
}
}