* started functions for accessing/editing META_POLYOBJ (bare minimum atm)

* added the "PolyObjects" array as a global var, with index and len functions, as well as its own iterate function

src/lua_polyobjlib.c

@@ -16,7 +16,113 @@
 #include "lua_script.h"
 #include "lua_libs.h"
 
+enum polyobj_e {
+	polyobj_valid = 0,
+};
+static const char *const polyobj_opt[] = {
+	"valid",
+	NULL};
+
+static int polyobj_get(lua_State *L)
+{
+	polyobj_t *polyobj = *((polyobj_t **)luaL_checkudata(L, 1, META_POLYOBJ));
+	enum polyobj_e field = luaL_checkoption(L, 2, NULL, polyobj_opt);
+
+	if (!polyobj) {
+		if (field == polyobj_valid) {
+			lua_pushboolean(L, false);
+			return 1;
+		}
+		return LUA_ErrInvalid(L, "polyobj_t");
+	}
+
+	switch (field)
+	{
+	case polyobj_valid:
+		lua_pushboolean(L, true);
+		break;
+	}
+	return 1;
+};
+
+static int polyobj_set(lua_State *L)
+{
+	return luaL_error(L, LUA_QL("polyobj_t") " struct cannot be edited by Lua."); // this is just temporary
+}
+
+static int lib_iteratePolyObjects(lua_State *L)
+{
+	INT32 i = -1;
+	if (lua_gettop(L) < 2)
+	{
+		//return luaL_error(L, "Don't call PolyObjects.iterate() directly, use it as 'for polyobj in PolyObjects.iterate do <block> end'.");
+		lua_pushcfunction(L, lib_iteratePolyObjects);
+		return 1;
+	}
+	lua_settop(L, 2);
+	lua_remove(L, 1); // state is unused.
+	if (!lua_isnil(L, 1))
+		i = (INT32)(*((polyobj_t **)luaL_checkudata(L, 1, META_POLYOBJ)) - PolyObjects);
+	for (i++; i < numPolyObjects; i++)
+	{
+		LUA_PushUserdata(L, &PolyObjects[i], META_POLYOBJ);
+		return 1;
+	}
+	return 0;
+}
+
+static int lib_getPolyObject(lua_State *L)
+{
+	const char *field;
+	INT32 i;
+
+	// find PolyObject by number
+	if (lua_type(L, 2) == LUA_TNUMBER)
+	{
+		i = luaL_checkinteger(L, 2);
+		if (i < 0 || i >= numPolyObjects)
+			return luaL_error(L, "PolyObjects[] index %d out of range (0 - %d)", i, numPolyObjects-1);
+		LUA_PushUserdata(L, &PolyObjects[i], META_POLYOBJ);
+		return 1;
+	}
+
+	field = luaL_checkstring(L, 2);
+	// special function iterate
+	if (fastcmp(field,"iterate"))
+	{
+		lua_pushcfunction(L, lib_iteratePolyObjects);
+		return 1;
+	}
+	return 0;
+}
+
+static int lib_numPolyObjects(lua_State *L)
+{
+	lua_pushinteger(L, numPolyObjects);
+	return 1;
+}
+
 int LUA_PolyObjLib(lua_State *L)
 {
+	luaL_newmetatable(L, META_POLYOBJ);
+		lua_pushcfunction(L, polyobj_get);
+		lua_setfield(L, -2, "__index");
+
+		lua_pushcfunction(L, polyobj_set);
+		lua_setfield(L, -2, "__newindex");
+
+		//lua_pushcfunction(L, polyobj_num);
+		//lua_setfield(L, -2, "__len");
+	lua_pop(L,1);
+
+	lua_newuserdata(L, 0);
+		lua_createtable(L, 0, 2);
+			lua_pushcfunction(L, lib_getPolyObject);
+			lua_setfield(L, -2, "__index");
+
+			lua_pushcfunction(L, lib_numPolyObjects);
+			lua_setfield(L, -2, "__len");
+		lua_setmetatable(L, -2);
+	lua_setglobal(L, "PolyObjects");
 	return 0;
 }