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yap-6.3/packages/python/py2pl.c
2016-07-31 10:09:21 -05:00

257 lines
7.3 KiB
C

#include "python.h"
static foreign_t repr_term(const char *pVal, size_t sz, term_t t) {
term_t to = PL_new_term_ref(), t1 = PL_new_term_ref();
PL_put_string_chars(t1, pVal);
PL_cons_functor(to, FUNCTOR_pointer1, t1);
Py_INCREF(pVal);
PL_reset_term_refs(to);
return PL_unify(t, to);
}
foreign_t assign_to_symbol(term_t t, PyObject *e);
/**
* assign_python 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.
*/
int assign_python(PyObject *root, term_t t, PyObject *e) {
switch (PL_term_type(t)) {
case PL_VARIABLE:
if (python_to_ptr(e, t))
return 1;
else
return -1;
case PL_ATOM:
return assign_to_symbol(t, e);
case PL_STRING:
case PL_INTEGER:
case PL_FLOAT:
return -1;
case PL_TERM:
if (PL_is_list(t)) {
return -1;
} else {
functor_t fun;
if (!PL_get_functor(t, &fun))
return -1;
if (fun == FUNCTOR_dollar1) {
if (!PL_get_arg(1, t, t))
return -1;
return assign_to_symbol(t, e);
}
if (fun == FUNCTOR_pointer1) {
return -1;
}
if (fun == FUNCTOR_sqbrackets2) {
term_t targ = PL_new_term_ref(), trhs = PL_new_term_ref();
PyObject *lhs, *rhs;
if (!PL_get_arg(1, t, targ))
return -1;
lhs = term_to_python(targ, true);
if (!PL_get_arg(2, t, targ) || !PL_is_list(targ) ||
!PL_get_list(targ, trhs, targ))
return -1;
if (PL_is_functor(trhs, FUNCTOR_dot2)) {
Py_ssize_t left, right;
if (!PL_get_arg(1, trhs, targ))
return -1;
left = get_p_int(term_to_python(targ, true), 0);
if (!PL_get_arg(2, trhs, targ))
return -1;
right = get_p_int(term_to_python(targ, true), PyObject_Size(lhs));
if (!PySequence_Check(lhs))
return -1;
PL_reset_term_refs(targ);
return PySequence_SetSlice(lhs, left, right, e);
} else {
rhs = term_to_python(trhs, true);
PL_reset_term_refs(targ);
return PyObject_SetItem(lhs, rhs, e);
}
}
}
}
return -1;
}
foreign_t assign_to_symbol(term_t t, PyObject *e) {
char *s;
PyErr_Clear();
if (!PL_get_atom_chars(t, &s)) {
wchar_t *w;
atom_t at;
size_t len;
PyObject *attr;
if (!PL_get_atom(t, &at)) {
return false;
}
if (!(w = PL_atom_wchars(at, &len)))
return false;
attr = PyUnicode_FromWideChar(w, wcslen(w));
if (attr) {
return PyObject_SetAttr(py_Main, attr, e) >= 0;
} else {
PyErr_Print();
return false;
}
} else if (proper_ascii_string(s)) {
return PyObject_SetAttrString(py_Main, s, e) >= 0;
} else {
PyObject *attr = PyUnicode_DecodeLatin1(s, strlen(s), NULL);
if (!attr)
return -1;
return PyObject_SetAttr(py_Main, attr, e) >= 0;
}
}
foreign_t python_to_ptr(PyObject *pVal, term_t t) {
Py_IncRef(pVal);
return address_to_term(pVal, t);
}
foreign_t python_to_term(PyObject *pVal, term_t t) {
if (pVal == Py_None) {
return PL_unify_atom(t, ATOM_none);
}
if (PyBool_Check(pVal)) {
if (PyObject_IsTrue(pVal)) {
return PL_unify_atom(t, ATOM_true);
} else {
return PL_unify_atom(t, ATOM_false);
}
} else if (PyLong_Check(pVal)) {
return PL_unify_int64(t, PyLong_AsLong(pVal));
#if PY_MAJOR_VERSION < 3
} else if (PyInt_Check(pVal)) {
return PL_unify_int64(t, PyInt_AsLong(pVal));
#endif
} else if (PyFloat_Check(pVal)) {
return PL_unify_float(t, PyFloat_AsDouble(pVal));
} else if (PyComplex_Check(pVal)) {
bool rc;
term_t to = PL_new_term_ref(), 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 = PL_unify(t, to);
}
PL_reset_term_refs(to);
return rc;
} else if (PyUnicode_Check(pVal)) {
atom_t tmp_atom;
#if PY_MAJOR_VERSION < 3
Py_ssize_t sz = PyUnicode_GetSize(pVal) + 1;
wchar_t *ptr = malloc(sizeof(wchar_t) * sz);
sz = PyUnicode_AsWideChar((PyUnicodeObject *)pVal, ptr, sz - 1);
#else
Py_ssize_t sz = PyUnicode_GetLength(pVal) + 1;
wchar_t *ptr = malloc(sizeof(wchar_t) * sz);
sz = PyUnicode_AsWideChar(pVal, ptr, sz);
#endif
tmp_atom = PL_new_atom_wchars(sz, ptr);
free(ptr);
return PL_unify_atom(t, tmp_atom);
} else if (PyByteArray_Check(pVal)) {
atom_t tmp_atom = PL_new_atom(PyByteArray_AsString(pVal));
return 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));
return PL_unify_atom(t, tmp_atom);
#endif
} else if (PyTuple_Check(pVal)) {
Py_ssize_t i, sz = PyTuple_Size(pVal);
functor_t f = PL_new_functor(ATOM_t, sz);
if (!PL_unify_functor(t, f))
return FALSE;
for (i = 0; i < sz; i++) {
term_t to = PL_new_term_ref();
if (!PL_unify_arg(i + 1, t, to))
return FALSE;
if (!python_to_term(PyTuple_GetItem(pVal, i), to))
return FALSE;
}
return TRUE;
} else if (PyList_Check(pVal)) {
term_t to = PL_new_term_ref();
Py_ssize_t i, sz = PyList_GET_SIZE(pVal);
for (i = 0; i < sz; i++) {
if (!PL_unify_list(t, to, t) ||
!python_to_term(PyList_GetItem(pVal, i), to))
return FALSE;
}
return PL_unify_nil(t);
} 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;
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)) {
return FALSE;
}
if (!python_to_term(value, tval)) {
return FALSE;
}
/* reuse */
tint = tkey;
if (!PL_cons_functor(tint, FUNCTOR_colon2, tkey, tval)) {
return FALSE;
}
if (--left) {
if (!PL_cons_functor(tint, FUNCTOR_comma2, tint, tnew))
return FALSE;
}
if (!PL_unify(ti, tint))
return FALSE;
ti = tnew;
}
PL_cons_functor(to, FUNCTOR_curly1, to);
return PL_unify(t, to);
} else {
PyObject *pValR = PyObject_Repr(pVal);
if (pValR == NULL)
return address_to_term(pVal, t);
Py_ssize_t sz = PyUnicode_GetSize(pValR) + 1;
#if PY_MAJOR_VERSION < 3
char *s = malloc(sizeof(char) * sz);
PyObject *us = PyUnicode_EncodeUTF8((const Py_UNICODE *)pValR, sz, NULL);
PyString_AsStringAndSize(us, &s, &sz);
foreign_t rc = repr_term(s, sz, t);
free((void *)s);
return rc;
#else
// new interface
char *s = PyUnicode_AsUTF8AndSize(pVal, &sz);
return repr_term(s, sz, t);
#endif
}
}