upb_mapiter *upb_mapiter_new(const upb_map *t, upb_alloc *a) {
upb_mapiter *ret = upb_malloc(a, upb_mapiter_sizeof());
if (!ret) {
return NULL;
}
upb_mapiter_begin(ret, t);
return ret;
}
static int lupb_map_pairs(lua_State *L) {
lupb_map *lmap = lupb_map_check(L, 1);
if (lupb_istypewrapped(upb_map_keytype(lmap->map)) ||
lupb_istypewrapped(upb_map_valuetype(lmap->map))) {
/* Complex key or value type.
* Sync upb_map to userval if necessary, then iterate over userval. */
/* TODO: Lua tables don't know how many entries they have, gah!. */
return 1;
} else {
/* Simple key and value type, iterate over the upb_map directly. */
upb_mapiter *i = lua_newuserdata(L, upb_mapiter_sizeof());
upb_mapiter_begin(i, lmap->map);
lua_pushvalue(L, 1);
/* Upvalues are [upb_mapiter, lupb_map]. */
lua_pushcclosure(L, &lupb_mapiter_next, 2);
return 1;
}
}