Golang C.lua_gettable函數代碼示例

func (tbl *Table) GetWithError(key interface{}) (interface{}, error) {
	if tbl.Ref == 0 {
		return nil, fmt.Errorf("cannot get a released lua table")
	}
	L := tbl.VM.globalL
	state := State{tbl.VM, L}
	bottom := C.lua_gettop(L)
	defer C.lua_settop(L, bottom)

	tbl.PushValue(state)

	vkey := reflect.ValueOf(key)
	ok := state.goToLuaValue(vkey)
	if !ok {
		return nil, fmt.Errorf("invalid key type for lua type: %v", vkey.Kind())
	}
	C.lua_gettable(L, C.int(-2))
	vvalue, err := state.luaToGoValue(-1, nil)
	if err != nil {
		return nil, err
	}

	if vvalue.IsValid() {
		return vvalue.Interface(), nil
	}
	return nil, nil
}

// Pcall calls a lua function. no panic
func (l *Lua) Pcall(fullname string, args ...interface{}) (returns []interface{}, err error) {
	C.push_errfunc(l.State)
	curTop := C.lua_gettop(l.State)
	// get function
	path := strings.Split(fullname, ".")
	for i, name := range path {
		if i == 0 {
			C.lua_getfield(l.State, C.LUA_GLOBALSINDEX, cstr(name))
		} else {
			if C.lua_type(l.State, -1) != C.LUA_TTABLE {
				return nil, fmt.Errorf("%s is not a function", fullname)
			}
			C.lua_pushstring(l.State, cstr(name))
			C.lua_gettable(l.State, -2)
			C.lua_remove(l.State, -2) // remove table
		}
	}
	if C.lua_type(l.State, -1) != C.LUA_TFUNCTION {
		return nil, fmt.Errorf("%s is not a function", fullname)
	}
	// args
	for _, arg := range args {
		l.pushGoValue(arg, "")
	}
	// call
	l.err = nil
	if ret := C.lua_pcall(l.State, C.int(len(args)), C.LUA_MULTRET, C.int(-(len(args))-2)); ret != 0 {
		// error occured
		return nil, fmt.Errorf("CALL ERROR: %s", C.GoString(C.lua_tolstring(l.State, -1, nil)))
	} else if l.err != nil { // error raise by invokeGoFunc
		return nil, l.err
	} else {
		// return values
		nReturn := C.lua_gettop(l.State) - curTop
		returns = make([]interface{}, int(nReturn))
		for i := C.int(0); i < nReturn; i++ {
			value, err := l.toGoValue(-1-i, interfaceType)
			if err != nil {
				return nil, err
			}
			returns[int(nReturn-1-i)] = value.Interface()
		}
	}
	return
}

func luaGetSubTable(L *C.lua_State, table C.int, key string) (bool, error) {
	pushStringToLua(L, key)
	C.lua_gettable(L, table)
	ltype := C.lua_type(L, -1)
	if ltype == C.LUA_TNIL {
		C.lua_createtable(L, 0, 0)
		// table[key] = {}
		pushStringToLua(L, key)
		C.lua_pushvalue(L, -2)
		C.lua_settable(L, table)
	}
	ltype = C.lua_type(L, -1)
	if ltype != C.LUA_TTABLE {
		C.lua_settop(L, -2)
		return false, fmt.Errorf("field `%v` exist, and it is not a table", key)
	}
	return true, nil
}

// lua_gettable
func (L *State) GetTable(index int) { C.lua_gettable(L.s, C.int(index)) }

// Pushes onto the stack the value t[k], where t is the value at the
// given valid index and k is the value at the top of the stack.
//
// This function pops the key from the stack (putting the resulting value
// in its place). As in Lua, this function may trigger a metamethod for
// the "index" event
func (this *State) Gettable(index int) {
	C.lua_gettable(this.luastate, C.int(index))
}

// Pushes onto the stack the value t[k], where t is the value at the
// given valid index and k is the value at the top of the stack.
//
// This function pops the key from the stack (putting the resulting value
// in its place). As in Lua, this function may trigger a metamethod for
// the "index" event
func (s *State) Gettable(index int) {
	C.lua_gettable(s.l, C.int(index))
}