static SCM pg_cell(SCM row, SCM col_key) {
SCM cell;
cell = scm_assq_ref(row, col_key);
scm_remember_upto_here_1(cell);
scm_remember_upto_here_2(row, col_key);
return cell;
}
static SCM call_callable(SCM scm_args)
{
SCM stack = scm_make_stack(SCM_BOOL_T, SCM_EOL);
SCM frame = scm_stack_ref(stack, scm_from_int(0));
SCM proc = scm_frame_procedure(frame);
PyObject *callable = scm_to_pointer(scm_assq_ref(gsubr_alist, proc));
scm_dynwind_begin(0);
PyObject *py_args = scm2py(scm_args);
if (py_args == NULL)
py2scm_exception(); /* does not return */
scm_dynwind_py_decref(py_args);
struct call_callable_data data = { callable, py_args };
PyObject *py_result = (PyObject *)scm_without_guile(
(void *(*)(void *))call_callable1, &data);
if (py_result == NULL)
py2scm_exception(); /* does not return */
scm_dynwind_py_decref(py_result);
SCM scm_result = py2scm(py_result);
scm_dynwind_end();
return scm_result;
}
PyObject *scm2py(SCM value)
{
if (value == NULL)
return NULL;
if (value == SCM_UNSPECIFIED) {
Py_INCREF(Py_None);
return Py_None;
}
if (scm_is_exact_integer(value))
return PyInt_FromLong(scm_to_long(value));
if (scm_is_real(value))
return PyFloat_FromDouble(scm_to_double(value));
if (scm_is_bool(value)) {
PyObject *result = scm_to_bool(value) ? Py_True : Py_False;
Py_INCREF(result);
return result;
}
if (value == SCM_EOL)
return PyTuple_New(0);
if (scm_is_string(value)) {
size_t len = 0;
char *s = scm_to_utf8_stringn(value, &len);
PyObject *result = PyUnicode_FromStringAndSize(s, len);
free(s);
return result;
}
if (scm_is_pair(value)) {
unsigned int len = scm_to_uint(scm_length(value));
PyObject *result = PyTuple_New(len);
scm_dynwind_begin(0);
scm_dynwind_unwind_handler(
(void (*)(void *))Py_DecRef, result, 0);
unsigned int i;
for (i = 0; i < len; i++) {
PyObject *item = scm2py(scm_car(value));
if (item == NULL) {
scm_dynwind_end();
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, i, item);
value = scm_cdr(value);
}
scm_dynwind_end();
return result;
}
if (scm_to_bool(scm_procedure_p(value))) {
SCM ptr = scm_assq_ref(gsubr_alist, value);
if (!scm_is_false(ptr)) {
PyObject *result = scm_to_pointer(ptr);
Py_INCREF(result);
return result;
}
Procedure *result =
(Procedure *)ProcedureType.tp_alloc(&ProcedureType, 0);
if (result == NULL)
return NULL;
result->proc = value;
return (PyObject *)result;
}
char *msg = scm_to_utf8_stringn(
scm_simple_format(
SCM_BOOL_F,
scm_from_utf8_string(
"Guile expression ~S doesn't have a "
"corresponding Python value"),
scm_list_1(value)), NULL);
PyErr_SetString(PyExc_TypeError, msg);
free(msg);
return NULL;
}
