/** Emit a signal to an object.
* \param L The Lua VM state.
* \param oud The object index on the stack.
* \param name The name of the signal.
* \param nargs The number of arguments to pass to the called functions.
*/
void
luaA_object_emit_signal(lua_State *L, int oud,
const char *name, int nargs)
{
int oud_abs = luaA_absindex(L, oud);
lua_object_t *obj = lua_touserdata(L, oud);
if(!obj)
luaL_error(L, "trying to emit signal on non-object");
signal_t *sigfound = signal_array_getbyid(&obj->signals,
a_strhash((const unsigned char *) name));
if(sigfound)
{
int nbfunc = sigfound->sigfuncs.len;
luaL_checkstack(L, lua_gettop(L) + nbfunc + nargs + 2, "too much signal");
/* Push all functions and then execute, because this list can change
* while executing funcs. */
foreach(func, sigfound->sigfuncs)
luaA_object_push_item(L, oud_abs, (void *) *func);
for(int i = 0; i < nbfunc; i++)
{
/* push object */
lua_pushvalue(L, oud_abs);
/* push all args */
for(int j = 0; j < nargs; j++)
lua_pushvalue(L, - nargs - nbfunc - 1 + i);
/* push first function */
lua_pushvalue(L, - nargs - nbfunc - 1 + i);
/* remove this first function */
lua_remove(L, - nargs - nbfunc - 2 + i);
luaA_dofunction(L, nargs + 1, 0);
}
}
lua_pop(L, nargs);
}
/** Convert a Lua table to a list of widget nodes.
* \param L The Lua VM state.
* \param idx Index of the table where to store the widgets references.
* \param widgets The linked list of widget node.
*/
static void
luaA_table2widgets(lua_State *L, int idx, widget_node_array_t *widgets)
{
if(lua_istable(L, -1))
{
int table_idx = luaA_absindex(L, idx);
lua_pushnil(L);
while(luaA_next(L, -2))
luaA_table2widgets(L, table_idx, widgets);
/* remove the table */
lua_pop(L, 1);
}
else
{
widget_t *widget = luaA_toudata(L, -1, &widget_class);
if(widget)
{
widget_node_t w;
p_clear(&w, 1);
w.widget = luaA_object_ref_item(L, idx, -1);
widget_node_array_append(widgets, w);
}
else
lua_pop(L, 1); /* remove value */
}
}
/** Emit a signal.
* @tparam string name A signal name.
* @param[opt] ... Various arguments.
* @function emit_signal
*/
void
luaA_object_emit_signal(lua_State *L, int oud,
const char *name, int nargs)
{
int oud_abs = luaA_absindex(L, oud);
lua_class_t *lua_class = luaA_class_get(L, oud);
lua_object_t *obj = luaA_toudata(L, oud, lua_class);
if(!obj) {
luaA_warn(L, "Trying to emit signal '%s' on non-object", name);
return;
}
else if(lua_class->checker && !lua_class->checker(obj)) {
luaA_warn(L, "Trying to emit signal '%s' on invalid object", name);
return;
}
signal_t *sigfound = signal_array_getbyid(&obj->signals,
a_strhash((const unsigned char *) name));
if(sigfound)
{
int nbfunc = sigfound->sigfuncs.len;
luaL_checkstack(L, lua_gettop(L) + nbfunc + nargs + 2, "too much signal");
/* Push all functions and then execute, because this list can change
* while executing funcs. */
foreach(func, sigfound->sigfuncs)
luaA_object_push_item(L, oud_abs, *func);
for(int i = 0; i < nbfunc; i++)
{
/* push object */
lua_pushvalue(L, oud_abs);
/* push all args */
for(int j = 0; j < nargs; j++)
lua_pushvalue(L, - nargs - nbfunc - 1 + i);
/* push first function */
lua_pushvalue(L, - nargs - nbfunc - 1 + i);
/* remove this first function */
lua_remove(L, - nargs - nbfunc - 2 + i);
luaA_dofunction(L, nargs + 1, 0);
}
} else {
luaA_warn(L, "Trying to emit unknown signal '%s'", name);
return;
}
/* Then emit signal on the class */
lua_pushvalue(L, oud);
lua_insert(L, - nargs - 1);
luaA_class_emit_signal(L, luaA_class_get(L, - nargs - 1), name, nargs + 1);
}
static void
move_global_to_table(lua_State *L, int index, const char *global_name, const char *local_name)
{
index = luaA_absindex(L, index);
/* Get the global */
lua_getglobal(L, global_name);
assert(!lua_isnil(L, -1));
/* Save it locally */
lua_setfield(L, index, local_name);
/* Set the global to nil */
lua_pushnil(L);
lua_setglobal(L, global_name);
}
