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yap-6.3/packages/python/pl2py.c

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#include "python.h"
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extern PyObject *py_Local, *py_Global;
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PyObject *YE(term_t t, int line, const char *file, const char *code)
{
char buf[1024];
YAP_WriteBuffer(YAP_GetFromSlot(t), buf, 1023, 0);
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fprintf(stderr, "**** Warning,%s@%s:%d: failed on expression %s\n", code, file, line, buf);
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return NULL;
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}
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void YEM(const char *exp, int line, const char *file, const char *code)
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{
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fprintf(stderr, "**** Warning,%s@%s:%d: failed while executing %s\n", code, file, line, exp);
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}
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/**
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* term_to_python translates and evaluates from Prolog to Python
*
* @param t handle to Prolog term
* @param t whether should try to evaluate evaluables.
*
* @return a Python object descriptor or NULL if failed
*/
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PyObject *term_to_python(term_t t, bool eval, PyObject *o)
{
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// o≈
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YAP_Term yt = YAP_GetFromSlot(t);
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// Yap_DebugPlWriteln(yt);
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switch (PL_term_type(t))
{
case PL_VARIABLE:
{
if (t == 0)
{
Yap_ThrowError(SYSTEM_ERROR_INTERNAL, yt, "in term_to_python");
}
PyObject *out = PyTuple_New(1);
PyTuple_SET_ITEM(out, 0, PyLong_FromLong(t));
return term_to_nametuple("v", 1, out);
};
case PL_ATOM:
{
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YAP_Atom at = YAP_AtomOfTerm(yt);
const char *s;
s = YAP_AtomName(at);
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if (eval)
{
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o = PythonLookup(s, o);
/* if (!o)
return o;
*/
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}
else
{
o = PythonLookupSpecial(s);
}
if (o)
{
Py_INCREF(o);
return CHECKNULL(t, o);
}
}
case PL_STRING:
{
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const char *s = NULL;
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if (YAP_IsAtomTerm(yt))
{
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s = YAP_AtomName(YAP_AtomOfTerm(yt));
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}
else if (YAP_IsStringTerm(yt))
{
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s = YAP_StringOfTerm(yt);
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}
else
{
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return CHECKNULL(t, NULL);
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}
#if PY_MAJOR_VERSION < 3
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if (proper_ascii_string(s))
{
PyObject *o = PyString_FromStringAndSize(s, strlen(s));
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return CHECKNULL(t, o);
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}
else
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#endif
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{
PyObject *pobj = PyUnicode_DecodeUTF8(s, strlen(s), NULL);
return CHECKNULL(t, pobj);
}
}
break;
case PL_INTEGER:
{
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int64_t j;
if (!PL_get_int64_ex(t, &j))
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return CHECKNULL(t, NULL);
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#if PY_MAJOR_VERSION < 3
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PyObject *o = PyInt_FromLong(j);
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return CHECKNULL(t, o);
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#else
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PyObject *o = PyLong_FromLong(j);
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return CHECKNULL(t, o);
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#endif
}
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case PL_FLOAT:
{
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PyObject *out;
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double fl;
if (!PL_get_float(t, &fl))
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return CHECKNULL(t, NULL);
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out = PyFloat_FromDouble(fl);
return CHECKNULL(t, out);
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}
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default:
{
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term_t tail = PL_new_term_ref(), arg;
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, *a;
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arg = tail;
out = PyList_New(len);
if (!out)
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return CHECKNULL(t, Py_None);
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for (i = 0; i < len; i++)
{
if (!PL_get_list(t, arg, t))
{
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PL_reset_term_refs(tail);
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return Py_None;
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}
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a = term_to_python(arg, eval, o);
if (a )
{
if (PyList_SetItem(out, i, a) < 0)
{
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return Py_None;
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}
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}
}
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PL_reset_term_refs(tail);
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return CHECKNULL(t, out);
}
else
{
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functor_t fun;
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PyObject *rc;
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if (!PL_get_functor(t, &fun))
{
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PL_reset_term_refs(tail);
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return CHECKNULL(t, Py_None);
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}
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if (eval)
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rc = compound_to_pyeval(t, o);
else
rc = compound_to_pytree(t, o);
PL_reset_term_refs(tail);
return rc;
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}
}
}
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return CHECKNULL(t, Py_None);
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}
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PyObject *yap_to_python(YAP_Term t, bool eval, PyObject *o)
{
if (t == 0)
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return NULL;
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term_t yt = YAP_InitSlot(t);
o = term_to_python(yt, eval, o);
PL_reset_term_refs(yt);
return o;
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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
// am\n");
YAP_Term yt = YAP_GetFromSlot(t);
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if (YAP_IsVarTerm(yt))
{
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char s[32];
char *o = YAP_WriteBuffer(yt, s, 31, 0);
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PyObject *p = PyUnicode_FromString(o);
return p;
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}
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return term_to_python(t, false, NULL);
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}