157 lines
3.8 KiB
C
157 lines
3.8 KiB
C
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#include "python.h"
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PyObject *yap_to_python(YAP_Term t, bool eval) {
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term_t yt = YAP_InitSlot(t);
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PyObject *o = term_to_python(yt, eval);
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PL_reset_term_refs(yt);
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return o;
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}
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/**
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* term_to_python translates and evaluates from Prolog to Python
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*
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* @param t handle to Prolog term
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* @param t whether should try to evaluate evaluables.
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*
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* @return a Python object descriptor or NULL if failed
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*/
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PyObject *term_to_python(term_t t, bool eval) {
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// Yap_DebugPlWritep(YAP_GetFromSlot(t)); fprintf(stderr, " here I
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YAP_Term yt = YAP_GetFromSlot(t);
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switch (PL_term_type(t)) {
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case PL_VARIABLE: {
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YAP_Term i = YAP_MkIntTerm(t);
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return term_to_nametuple(
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"H", 1, YAP_InitSlot(YAP_MkApplTerm(
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YAP_MkFunctor(YAP_LookupAtom("H"), 1), 1, &i)));
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};
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case PL_ATOM: {
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YAP_Atom at = YAP_AtomOfTerm(yt);
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const char *s;
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PyObject *o;
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PyObject *c = NULL;
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s = YAP_AtomName(at);
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if (strcmp(s, "true") == 0)
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return Py_True;
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if (strcmp(s, "false") == 0)
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return Py_False;
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if (strcmp(s, "none") == 0)
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return Py_None;
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if (strcmp(s, "[]") == 0)
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o = PyList_New(0);
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else if (strcmp(s, "{}") == 0)
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o = PyDict_New();
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/* return __main__,s */
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else if ((o = PyRun_String(s, Py_single_input, PyEval_GetGlobals(),
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PyEval_GetLocals()))) {
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Py_IncRef(o);
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return o;
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} else if (PyObject_HasAttrString(py_Main, s)) {
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o = PyObject_GetAttrString(py_Main, s);
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} else {
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o = PyUnicode_FromString(s);
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if (eval)
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return NULL;
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if (PyObject_HasAttrString(py_Main, "A"))
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c = PyObject_GetAttrString(py_Main, "A");
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if (!c && PyObject_HasAttrString(py_Yapex, "A"))
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c = PyObject_GetAttrString(py_Yapex, "A");
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if (!c || !PyCallable_Check(c)) {
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return o;
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} else {
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PyObject *t = PyTuple_New(1);
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PyTuple_SET_ITEM(t, 0, PyUnicode_FromString(s));
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o = PyObject_CallObject(c, t);
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}
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}
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if (o) {
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Py_IncRef(o);
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}
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return o;
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} break;
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case PL_STRING: {
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char *s = NULL;
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if (!PL_get_chars(t, &s, REP_UTF8 | CVT_ATOM | CVT_STRING | BUF_MALLOC)) {
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return NULL;
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}
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#if PY_MAJOR_VERSION < 3
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if (proper_ascii_string(s)) {
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return PyString_FromStringAndSize(s, strlen(s));
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} else
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#endif
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{
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PyObject *pobj = PyUnicode_DecodeUTF8(s, strlen(s), NULL);
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// fprintf(stderr, "%s\n", s);
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free(s);
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if (pobj) {
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Py_IncRef(pobj);
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}
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return pobj;
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}
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} break;
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case PL_INTEGER: {
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int64_t j;
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if (!PL_get_int64_ex(t, &j))
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return NULL;
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#if PY_MAJOR_VERSION < 3
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return PyInt_FromLong(j);
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#else
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return PyLong_FromLong(j);
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#endif
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}
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case PL_FLOAT: {
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double fl;
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if (!PL_get_float(t, &fl))
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return NULL;
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return PyFloat_FromDouble(fl);
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}
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default: {
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term_t tail = PL_new_term_ref(), arg;
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size_t len, i;
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if (PL_skip_list(t, tail, &len) && PL_get_nil(tail)) {
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PyObject *out;
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arg = tail;
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out = PyList_New(len);
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if (!out)
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return NULL;
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for (i = 0; i < len; i++) {
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if (!PL_get_list(t, arg, t)) {
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return NULL;
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}
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if (PyList_SetItem(out, i, term_to_python(arg, eval)) < 0) {
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return NULL;
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}
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}
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return out;
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} else {
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functor_t fun;
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if (!PL_get_functor(t, &fun))
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return NULL;
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if (eval)
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return compound_to_pyeval(t, fun);
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return compound_to_pytree(t, fun);
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}
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}
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}
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return NULL;
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}
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PyObject *deref_term_to_python(term_t t) {
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// Yap_DebugPlWrite(YAP_GetFromSlot(t)); fprintf(stderr, " here I
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// am\n");
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YAP_Term yt = YAP_GetFromSlot(t);
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if (YAP_IsVarTerm(yt)) {
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char s[32];
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char *o = YAP_WriteBuffer(yt, s, 31, 0);
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return PyUnicode_FromString(o);
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}
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return term_to_python(t, false);
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}
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