improve C++ interface

CXX/yapi.hh

@@ -1,10 +1,11 @@
 
+
 #define YAP_CPP_INTERFACE 1
 
 #include <gmpxx.h>
 
-//! @{
 
+//! @{
 /**
  *
  *   @defgroup yap-cplus-interface An object oriented interface for YAP.
@@ -65,6 +66,35 @@ extern "C" {
 // taken from yap_structs.h
 #include "iopreds.h"
 
+#ifdef SWIGPYTHON
+extern  PyObject *term_to_python(yhandle_t t, bool eval);
+extern  PyObject *deref_term_to_python(yhandle_t t);
+X_API bool init_python(void);
+
+extern PyObject *py_Main;
+
+extern inline PyObject *AtomToPy( const char *s)
+{
+  if (strcmp(s, "true") == 0)
+    return Py_True;
+  if (strcmp(s, "false") == 0)
+    return Py_False;
+  if (strcmp(s, "none") == 0)
+    return Py_None;
+  if (strcmp(s, "[]") == 0)
+    return PyList_New(0);
+  else if (strcmp(s, "{}") == 0)
+    return PyDict_New();
+    /* return __main__,s */
+  else if (PyObject_HasAttrString(py_Main, s)) {
+    return PyObject_GetAttrString(py_Main, s);
+  }
+  // no way to translate
+  return NULL;
+}
+
+#endif
+
 X_API void YAP_UserCPredicate(const char *, YAP_UserCPred, YAP_Arity arity);
 
 /*  void UserCPredicateWithArgs(const char *name, int *fn(), unsigned int arity) */
@@ -76,6 +106,8 @@ X_API void YAP_UserCPredicateWithArgs(const char *, YAP_UserCPred, YAP_Arity, YA
 
 X_API Term Yap_StringToTerm(const char *s, size_t len, encoding_t *encp, int prio, Term *bindings_p);
 
+
+
 }
 
 class YAPEngine;