int scm_c_symbol_exists(const char *name) {
SCM sym;
SCM var;
sym = scm_str2symbol(name);
/* Check to see if the symbol exists */
var = scm_sym2var (sym,
scm_current_module_lookup_closure(),
SCM_BOOL_F
);
if (var != SCM_BOOL_F)
return 1;
return 0;
}
// Common code for pyscm_PySCM_getattr() and pyscm_PySCM_setattr():
// Retrieve and return the 4-element vector corresponding to desired
// attribute of the pyscm_PySCMObject.
// Perform also validity checking and raise Python exception if
// invalid.
// Since it is needed later, also the SCM object, corresponding to the
// pyscm_PySCMObject, is returned to the caller, put into 2-element
// list together with the #:-keyword corresponding to name.
static SCM
retrieve_sattr_vector(pyscm_PySCMObject *self, char *name, SCM *sobj_keyword)
{
SCM shandle = scm_hashv_get_handle(pyscm_registration_hash,scm_long2num(self->ob_scm_index));
if (SCM_BOOLP(shandle) && SCM_EQ_P(SCM_BOOL_F,shandle)) {
Py_FatalError("PySCM object lost its associated SCM object");
}
// Now:
// SCM_CADR(shandle) is the SCM object itself
// SCM_CDDR(shandle) is the stemplate.
SCM sattrshash = GET_ATTRS_HASH(SCM_CDDR(shandle));
if (SCM_EQ_P(SCM_BOOL_F,sattrshash)) {
PyErr_SetString(PyExc_AttributeError, name);
return(SCM_UNDEFINED); // Error return
}
// The object has attributes. Build the hash key (a keyword).
size_t nlength = strlen(name);
char *dashstr = malloc(nlength+2);
dashstr[0] = '-';
dashstr[1] = '\0';
strncat(dashstr,name,nlength);
SCM skeyword = scm_make_keyword_from_dash_symbol(scm_str2symbol(dashstr));
// !!! Do we have to free dashstr?
// !!! Similar code is used also in pytoguile.c - review it.
SCM sattr_vector_handle = scm_hashv_get_handle(sattrshash,skeyword);
if (SCM_EQ_P(SCM_BOOL_F,sattr_vector_handle)) {
// Missing attribute. How to deal with it?
sattr_vector_handle = scm_hashv_get_handle(sattrshash,SCM_BOOL_F);
if (SCM_EQ_P(SCM_BOOL_F,sattr_vector_handle)) {
// Hash value corresponding to key #f is itself another #f, which
// means that the object does not wish to exhibit to Python
// unknown attributes.
PyErr_SetString(PyExc_AttributeError, name);
return(SCM_UNDEFINED); // Error return
}
// Otherwise, we'll use the hash value corresponding to #f as
// a catch-all for all attributes not otherwise defined.
}
*sobj_keyword = scm_list_2(SCM_CADR(shandle),skeyword);
return(SCM_CDR(sattr_vector_handle));
}
GameObjData*
GameObjDataFactory::create (SCM symbol, SCM data)
{
/*
if (Guile::equal_p(scm_str2symbol("tree"), symbol))
{
return new TreeData (data);
}
else*/
if (Guile::equal_p(scm_str2symbol("tank"), symbol))
{
std::cout << "GameObjDataFactory::create: not implemented" << std::endl;
}
else
{
std::cout << "GameObjDataFactory: Unknown symbol: " << std::flush;
gh_display (symbol);
gh_newline ();
}
return 0;
}
