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yap-6.3/packages/python/pypreds.c

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2016-07-31 16:09:21 +01:00
#include "python.h"
static int conj_size(term_t source) {
if (PL_is_functor(source, FUNCTOR_comma2)) {
term_t a1 = PL_new_term_ref(), a2 = PL_new_term_ref();
if (PL_get_arg(1, source, a1) <= 0 || PL_get_arg(2, source, a2) <= 0)
return -1;
return conj_size(a1) + conj_size(a2);
}
return 1;
}
static int conj_copy(term_t target, PyObject *e, int pos) {
if (PL_is_functor(target, FUNCTOR_comma2)) {
term_t a1 = PL_new_term_ref(), a2 = PL_new_term_ref();
if (PL_get_arg(1, target, a1) <= 0 || PL_get_arg(2, target, a2) <= 0)
return -1;
int p1 = conj_copy(a1, e, pos);
return conj_copy(a2, e, p1);
} else {
assign_python(py_Main, target, PyTuple_GetItem(e, pos));
return pos + 1;
}
}
static foreign_t python_f(term_t tmod, term_t fname, term_t tf) {
char *s;
size_t len;
PyObject *pF, *pModule;
/* if an atom, fetch again */
if (PL_is_atom(tmod)) {
PyObject *pName;
if (!PL_get_nchars(fname, &len, &s, CVT_ALL | CVT_EXCEPTION)) {
return FALSE;
}
#if PY_MAJOR_VERSION < 3
pName = PyString_FromString(s);
#else
pName = PyUnicode_FromString(s);
#endif
if (pName == NULL) {
return FALSE;
}
pModule = PyImport_Import(pName);
} else if (!(pModule = term_to_python(tmod, true)))
return FALSE;
if (!PL_get_nchars(fname, &len, &s, CVT_ALL | CVT_EXCEPTION)) {
return FALSE;
}
pF = PyObject_GetAttrString(pModule, s);
PyErr_Print();
Py_DECREF(pModule);
if (pF == NULL || !PyCallable_Check(pF)) {
return FALSE;
}
return python_to_ptr(pF, tf);
}
static foreign_t python_o(term_t tmod, term_t fname, term_t tf) {
char *s;
size_t len;
PyObject *pO, *pModule;
pModule = term_to_python(tmod, true);
if (!PL_get_nchars(fname, &len, &s, CVT_ALL | CVT_EXCEPTION)) {
return FALSE;
}
pO = PyObject_GetAttrString(pModule, s);
if (pO == NULL) {
return FALSE;
}
return python_to_ptr(pO, tf);
}
static foreign_t python_len(term_t tobj, term_t tf) {
Py_ssize_t len;
PyObject *o;
o = term_to_python(tobj, true);
if (o == NULL)
return FALSE;
len = PyObject_Length(o);
return PL_unify_int64(tf, len);
}
static foreign_t python_dir(term_t tobj, term_t tf) {
PyObject *dir;
PyObject *o;
o = term_to_python(tobj, true);
if (o == NULL)
return FALSE;
dir = PyObject_Dir(o);
return python_to_ptr(dir, tf);
}
static foreign_t python_index(term_t tobj, term_t tindex, term_t val) {
PyObject *i;
PyObject *o;
PyObject *f;
o = term_to_python(tobj, true);
if (o == NULL)
return false;
if (!PySequence_Check(o))
return false;
i = term_to_python(tindex, true);
if (i == NULL)
return false;
#if PY_MAJOR_VERSION < 3
f = PyObject_CallMethodObjArgs(o, PyString_FromString("getitem"), i);
#else
f = PyObject_CallMethodObjArgs(o, PyUnicode_FromString("getitem"), i);
#endif
return python_to_ptr(f, val);
}
static foreign_t python_is(term_t tobj, term_t tf) {
PyObject *o;
o = term_to_python(tobj, true);
if (!o)
return FALSE;
return python_to_ptr(o, tf);
}
static foreign_t python_assign_item(term_t parent, term_t indx, term_t tobj) {
PyObject *pF, *pI;
PyObject *p;
// get Scope ...
pI = term_to_python(indx, true);
// got Scope.Exp
// get Scope ...
p = term_to_python(parent, true);
// Exp
// get Scope ...
pF = term_to_python(parent, true);
// Exp
if (!pI || !p) {
return false;
} else if (PyObject_SetItem(p, pI, pF)) {
PyErr_Print();
return FALSE;
}
Py_DecRef(pI);
Py_DecRef(p);
return true;
}
/** assign a tuple to something:
*/
static foreign_t python_assign_tuple(term_t t_lhs, term_t t_rhs) {
PyObject *e = term_to_python(t_rhs, true);
Py_ssize_t sz;
functor_t f;
if (!e || !PyTuple_Check(e)) {
return -1;
}
sz = PyTuple_Size(e);
switch (PL_term_type(t_lhs)) {
case PL_VARIABLE:
return PL_unify(t_lhs, t_rhs);
case PL_ATOM:
return assign_python(py_Main, t_rhs, e);
case PL_TERM:
if (PL_get_functor(t_lhs, &f)) {
term_t targ = PL_new_term_ref();
// assign a tuple to a tuple
if (PL_functor_name(f) == ATOM_t && ((sz = PL_functor_arity(f)))) {
Py_ssize_t i;
for (i = 0; i < sz; i++) {
PL_get_arg(i + 1, t_lhs, targ);
assign_python(py_Main, targ, PyTuple_GetItem(e, i));
}
} else if (PL_functor_name(f) == ATOM_comma) {
int n = conj_size(t_lhs);
if (n != sz)
return -1;
return conj_copy(t_lhs, e, 0);
} else if (PL_functor_name(f) == ATOM_dot) { // vectors
size_t len;
term_t tail = PL_new_term_ref();
PL_skip_list(t_lhs, tail, &len);
if (!PL_get_nil(tail))
return -1;
term_t arg = tail;
size_t i;
for (i = 0; i < len; i++) {
if (!PL_get_list(t_rhs, arg, t_rhs)) {
return -1;
}
if (assign_python(py_Main, arg, PyTuple_GetItem(e, i)) < 0)
return -1;
}
}
}
}
return -1;
}
static foreign_t python_item(term_t parent, term_t indx, term_t tobj) {
PyObject *pF, *pI;
PyObject *p;
// get Scope ...
pI = term_to_python(indx, true);
// got Scope.Exp
// get Scope ...
p = term_to_python(parent, true);
// Exp
if (!pI || !p) {
return false;
} else if ((pF = PyObject_GetItem(p, pI)) == NULL) {
PyErr_Print();
return FALSE;
}
Py_DecRef(pI);
Py_DecRef(p);
return address_to_term(pF, tobj);
}
static foreign_t python_slice(term_t parent, term_t indx, term_t tobj) {
PyObject *pF, *pI;
PyObject *p;
// get Scope ...
pI = term_to_python(indx, true);
// got Scope.Exp
// get Scope ...
p = term_to_python(parent, true);
// Exp
if (!pI || !p) {
return false;
} else if ((pF = PySequence_GetSlice(p, 0, 0)) == NULL) {
PyErr_Print();
return FALSE;
}
Py_DecRef(pI);
Py_DecRef(p);
return address_to_term(pF, tobj);
}
static foreign_t python_apply(term_t tin, term_t targs, term_t keywds,
term_t tf) {
PyObject *pF;
PyObject *pArgs, *pKeywords;
PyObject *pValue;
int i, arity;
atom_t aname;
foreign_t out;
term_t targ = PL_new_term_ref();
pF = term_to_python(tin, true);
if (pF == NULL) {
return false;
}
if (PL_is_atom(targs)) {
pArgs = NULL;
} else {
if (!PL_get_name_arity(targs, &aname, &arity)) {
return FALSE;
}
if (arity == 1 && PL_get_arg(1, targs, targ) && PL_is_variable(targ)) {
/* ignore (_) */
pArgs = NULL;
} else {
pArgs = PyTuple_New(arity);
if (!pArgs)
return FALSE;
for (i = 0; i < arity; i++) {
PyObject *pArg;
if (!PL_get_arg(i + 1, targs, targ))
return FALSE;
pArg = term_to_python(targ, true);
if (pArg == NULL)
return FALSE;
/* pArg reference stolen here: */
PyTuple_SetItem(pArgs, i, pArg);
}
}
}
if (PL_is_atom(keywds)) {
pKeywords = NULL;
} else {
pKeywords = term_to_python(keywds, true);
}
if (PyCallable_Check(pF)) {
pValue = PyEval_CallObjectWithKeywords(pF, pArgs, pKeywords);
// PyObject_Print(pF,stderr,0);fprintf(stderr, "\n");
// PyObject_Print(pArgs,stderr,0);fprintf(stderr, " ");
// PyObject_Print(pKeywords,stderr,0);fprintf(stderr, "\n");
if (!pValue)
PyErr_Print();
else
Py_IncRef(pValue);
} else if (pArgs == NULL) {
pValue = pF;
if (pF) {
Py_IncRef(pValue);
}
} else {
PyErr_Print();
return FALSE;
}
if (pArgs)
Py_DECREF(pArgs);
Py_DECREF(pF);
if (pValue == NULL)
return FALSE;
out = python_to_ptr(pValue, tf);
return out;
}
static foreign_t python_assign(term_t name, term_t exp) {
PyObject *e = term_to_python(exp, true);
if (e == NULL)
return FALSE;
return assign_python(py_Main, name, e) >= 0;
}
static foreign_t python_assign_field(term_t source, term_t name, term_t exp) {
PyObject *e = term_to_python(exp, true), *root = term_to_python(source, true);
if (e == NULL)
return FALSE;
return assign_python(root, name, e) >= 0;
}
static foreign_t python_builtin_eval(term_t caller, term_t dict, term_t out) {
PyObject *pI, *pArgs, *pOut;
PyObject *env;
atom_t name;
char *s;
int i, arity;
term_t targ = PL_new_term_ref();
if ((env = py_Builtin) == NULL) {
// no point in even trying
return false;
}
if (PL_get_name_arity(caller, &name, &arity)) {
if (!(s = PL_atom_chars(name)))
return false;
if ((pI = PyObject_GetAttrString(env, s)) == NULL) {
PyErr_Print();
return false;
}
} else {
// Prolog should make sure this never happens.
return false;
}
pArgs = PyTuple_New(arity);
for (i = 0; i < arity; i++) {
PyObject *pArg;
if (!PL_get_arg(i + 1, caller, targ))
return FALSE;
/* ignore (_) */
if (i == 0 && PL_is_variable(targ)) {
pArg = Py_None;
} else {
pArg = term_to_python(targ, true);
if (pArg == NULL)
return FALSE;
}
/* pArg reference stolen here: */
if (PyTuple_SetItem(pArgs, i, pArg)) {
PyErr_Print();
return false;
}
}
pOut = PyObject_CallObject(pI, pArgs);
Py_DECREF(pArgs);
Py_DECREF(pI);
if (pOut == NULL) {
PyErr_Print();
return false;
}
return python_to_ptr(pOut, out);
}
static foreign_t python_access(term_t obj, term_t f, term_t out) {
PyObject *o = term_to_python(obj, true), *pValue, *pArgs, *pF;
atom_t name;
char *s;
int i, arity;
term_t targ = PL_new_term_ref();
if (o == NULL)
return FALSE;
if (PL_is_atom(f)) {
if (!PL_get_atom_chars(f, &s))
return FALSE;
if ((pValue = PyObject_GetAttrString(o, s)) == NULL) {
PyErr_Print();
return FALSE;
}
return python_to_term(pValue, out);
}
if (!PL_get_name_arity(f, &name, &arity)) {
return FALSE;
}
/* follow chains of the form a.b.c.d.e() */
while (name == ATOM_dot && arity == 2) {
term_t tleft = PL_new_term_ref();
PyObject *lhs;
if (!PL_get_arg(1, f, tleft))
return FALSE;
lhs = term_to_python(tleft, true);
if ((o = PyObject_GetAttr(o, lhs)) == NULL) {
PyErr_Print();
return FALSE;
}
if (!PL_get_arg(2, f, f))
return FALSE;
if (!PL_get_name_arity(f, &name, &arity)) {
return FALSE;
}
}
s = PL_atom_chars(name);
if (!s)
return false;
if ((pF = PyObject_GetAttrString(o, s)) == NULL) {
PyErr_Print();
return FALSE;
}
pArgs = PyTuple_New(arity);
for (i = 0; i < arity; i++) {
PyObject *pArg;
if (!PL_get_arg(i + 1, f, targ))
return FALSE;
/* ignore (_) */
if (i == 0 && PL_is_variable(targ)) {
pArgs = Py_None;
}
pArg = term_to_python(targ, true);
if (pArg == NULL)
return FALSE;
/* pArg reference stolen here: */
PyTuple_SetItem(pArgs, i, pArg);
}
pValue = PyObject_CallObject(pF, pArgs);
Py_DECREF(pArgs);
Py_DECREF(pF);
if (pValue == NULL) {
return FALSE;
}
return python_to_term(pValue, out);
}
static foreign_t python_field(term_t parent, term_t att, term_t tobj) {
PyObject *pF;
atom_t name;
char *s;
int arity;
if (!PL_get_name_arity(att, &name, &arity)) {
return false;
} else {
PyObject *p;
// got Scope.Exp
// get Scope ...
p = term_to_python(parent, true);
// Exp
if (!PL_get_name_arity(att, &name, &arity)) {
return false;
}
s = PL_atom_chars(name);
if (arity == 1 && !strcmp(s, "()")) {
if (!PL_get_arg(1, att, att))
return false;
if (!PL_get_name_arity(att, &name, &arity)) {
return false;
}
s = PL_atom_chars(name);
}
if (!s || !p) {
return false;
} else if ((pF = PyObject_GetAttrString(p, s)) == NULL) {
PyErr_Clear();
return FALSE;
}
}
return address_to_term(pF, tobj);
}
static foreign_t python_main_module(term_t mod) {
return address_to_term(py_Main, mod);
}
static foreign_t python_function(term_t tobj) {
PyObject *obj = term_to_python(tobj, true);
return PyFunction_Check(obj);
}
foreign_t python_builtin(term_t out) {
return address_to_term(py_Builtin, out);
}
static foreign_t python_run_file(term_t file) {
char *s;
size_t len;
char si[256];
s = si;
if (PL_get_nchars(file, &len, &s, CVT_ALL | CVT_EXCEPTION)) {
#if PY_MAJOR_VERSION < 3
PyObject *PyFileObject = PyFile_FromString(si, "r");
PyRun_SimpleFileEx(PyFile_AsFile(PyFileObject), "test.py", 1);
#else
FILE *f = fopen(s, "r");
if (f == NULL)
return false;
PyRun_SimpleFileEx(f, s, 1);
#endif
return TRUE;
}
return false;
}
static foreign_t python_run_command(term_t cmd) {
char *s;
size_t len;
char si[256];
s = si;
if (PL_get_nchars(cmd, &len, &s, CVT_ALL | CVT_EXCEPTION)) {
PyRun_SimpleString(s);
}
return TRUE;
}
static foreign_t python_run_script(term_t cmd, term_t fun) {
char si[256], sf[256];
size_t len = 255, len1 = 255;
PyObject *pName, *pModule, *pFunc;
PyObject *pArgs = NULL, *pValue;
char *s;
s = si;
if (PL_get_nchars(cmd, &len, &s, CVT_ALL | CVT_EXCEPTION) &&
(s = sf) != NULL &&
PL_get_nchars(fun, &len1, &s, CVT_ALL | CVT_EXCEPTION)) {
#if PY_MAJOR_VERSION < 3
pName = PyString_FromString("rbm");
#else
// asssumes UTF-8
pName = PyUnicode_FromString("rbm");
#endif
/* Error checking of pName left out */
pModule = PyImport_Import(pName);
Py_DECREF(pName);
if (pModule != NULL) {
pFunc = PyObject_GetAttrString(pModule, sf);
/* pFunc is a new reference */
if (pFunc && PyCallable_Check(pFunc)) {
pValue = PyObject_CallObject(pFunc, pArgs);
if (pValue != NULL) {
Py_DECREF(pValue);
} else {
Py_DECREF(pFunc);
Py_DECREF(pModule);
PyErr_Print();
fprintf(stderr, "Call failed\n");
return false;
}
} else {
if (PyErr_Occurred())
PyErr_Print();
fprintf(stderr, "Cannot find function \"%s\"\n", sf);
}
Py_XDECREF(pFunc);
Py_DECREF(pModule);
} else {
PyErr_Print();
return false;
}
return true;
}
return false;
}
static foreign_t python_export(term_t t, term_t pl) {
foreign_t rc = false;
if (PL_is_functor(t, FUNCTOR_pointer1)) {
void *ptr;
term_t targ = PL_new_term_ref();
if (!PL_get_arg(1, t, targ))
return false;
if (!PL_get_pointer(targ, &ptr))
return false;
Py_INCREF((PyObject *)ptr);
/* return __main__,s */
rc = python_to_term((PyObject *)ptr, pl);
}
return rc;
}
static int python_import(term_t mname, term_t mod) {
PyObject *pName, *pModule;
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term_t arg = PL_new_term_ref();
char s0[MAXPATHLEN], *s = s0;
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while (true) {
size_t len;
len = (MAXPATHLEN - 1) - (s - s0);
if (PL_is_pair(mname)) {
char *sa;
if (!PL_get_arg(1, mname, arg) || !PL_get_atom_chars(arg, &sa) ||
!PL_get_arg(2, mname, mname))
return false;
s = stpcpy(s, sa);
*s++ = '.';
} else if (!PL_get_nchars(mname, &len, &s,
CVT_ALL | CVT_EXCEPTION | ENC_ISO_UTF8)) {
return false;
} else {
break;
}
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}
#if PY_MAJOR_VERSION < 3
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pName = PyString_FromString(s0);
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#else
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pName = PyUnicode_FromString(s0);
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#endif
if (pName == NULL) {
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return false;
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}
pModule = PyImport_Import(pName);
Py_DECREF(pName);
if (pModule == NULL) {
#if EXTRA_MESSSAGES
if (PyErr_Occurred())
PyErr_Print();
PyErr_Clear();
#endif
return FALSE;
}
ActiveModules[active_modules++] = pModule;
return python_to_ptr(pModule, mod);
}
install_t install_pypreds(void) {
PL_register_foreign("python_builtin_eval", 3, python_builtin_eval, 0);
PL_register_foreign("python_builtin", 1, python_builtin, 0);
PL_register_foreign("python_import", 2, python_import, 0);
PL_register_foreign("python_f", 3, python_f, 0);
PL_register_foreign("python_o", 3, python_o, 0);
PL_register_foreign("python_len", 2, python_len, 0);
PL_register_foreign("python_is", 2, python_is, 0);
PL_register_foreign("python_dir", 2, python_dir, 0);
PL_register_foreign("python_apply", 4, python_apply, 0);
PL_register_foreign("python_index", 3, python_index, 0);
PL_register_foreign("python_field", 3, python_field, 0);
PL_register_foreign("python_assign", 2, python_assign, 0);
PL_register_foreign("python_assign_field", 3, python_assign_field, 0);
PL_register_foreign("python_assign_tuple", 2, python_assign_tuple, 0);
PL_register_foreign("python_export", 2, python_export, 0);
PL_register_foreign("python_function", 1, python_function, 0);
PL_register_foreign("python_slice", 4, python_slice, 0);
PL_register_foreign("python_item", 3, python_item, 0);
PL_register_foreign("python_assign_item", 3, python_assign_item, 0);
PL_register_foreign("python_run_file", 1, python_run_file, 0);
PL_register_foreign("python_run_command", 1, python_run_command, 0);
PL_register_foreign("python_run_script", 2, python_run_script, 0);
PL_register_foreign("python_main_module", 1, python_main_module, 0);
PL_register_foreign("python_import", 2, python_import, 0);
PL_register_foreign("python_access", 3, python_access, 0);
}