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))
}