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Lua: allow obj chain iteration

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This commit is contained in:
Pasi Kallinen
2022-03-15 18:24:49 +02:00
parent e33dd11e99
commit bdc81ab389
2 changed files with 25 additions and 6 deletions
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10
doc/lua.adoc
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@@ -1068,11 +1068,17 @@ Example:
=== next
Get the next object in the object chain.
When called without an object, returns the first object in the object chain.
When called with an object, an optional boolean parameter can be given. When
it is true, and the object is on the map, the next object at the same location
is returned. Otherwise the normal object chain is followed.
Example:
local o = obj.at(x, y);
local o2 = o:next();
local first = obj.next();
local second = first:next();
local o_at_xy = obj.at(x, y);
local next_at_xy = o_at_xy:next(true);
=== totable

21
src/nhlobj.c
View File

@@ -399,15 +399,28 @@ l_obj_placeobj(lua_State *L)
/* Get the next object in the object chain */
/* local o = obj.at(x, y);
local o2 = o:next();
local o2 = o:next(true);
local firstobj = obj.next();
*/
static int
l_obj_nextobj(lua_State *L)
{
struct _lua_obj *lo = l_obj_check(L, 1);
int argc = lua_gettop(L);
if (lo && lo->obj)
(void) l_obj_push(L, lo->obj->where == OBJ_FLOOR ? lo->obj->nexthere : lo->obj->nobj);
if (argc == 0) {
(void) l_obj_push(L, fobj);
} else {
struct _lua_obj *lo = l_obj_check(L, 1);
boolean use_nexthere = FALSE;
if (argc == 2)
use_nexthere = lua_toboolean(L, 2);
if (lo && lo->obj)
(void) l_obj_push(L, (use_nexthere && lo->obj->where == OBJ_FLOOR)
? lo->obj->nexthere
: lo->obj->nobj);
}
return 1;
}