Golang C.lua_remove类(方法)实例源码

// 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
}

// Encodes a Go object into Msgpack and adds it to the function arguments.
func (e *ExecutionEngine) encodeArgument(value interface{}) error {
	// Encode Go object into msgpack.
	buffer := new(bytes.Buffer)
	encoder := msgpack.NewEncoder(buffer)
	err := encoder.Encode(value)
	if err != nil {
		return err
	}

	// Push the msgpack data onto the Lua stack.
	data := buffer.String()
	cdata := C.CString(data)
	defer C.free(unsafe.Pointer(cdata))
	C.lua_pushlstring(e.state, cdata, (C.size_t)(len(data)))

	// Convert the argument from msgpack into Lua.
	rc := C.mp_unpack(e.state)
	if rc != 1 {
		return errors.New("skyd.ExecutionEngine: Unable to msgpack encode Lua argument")
	}
	C.lua_remove(e.state, -2)

	return nil
}

// lua_remove
func (L *State) Remove(index int) {
	C.lua_remove(L.s, C.int(index))
}

// Removes the element at the given valid index, shifting down the elements
// above this index to fill the gap. Cannot be called with a pseudo-index,
// because a pseudo-index is not an actual stack position.
func (this *State) Remove(index int) {
	C.lua_remove(this.luastate, C.int(index))
}

// Removes the element at the given valid index, shifting down the elements
// above this index to fill the gap. Cannot be called with a pseudo-index,
// because a pseudo-index is not an actual stack position.
func (s *State) Remove(index int) {
	C.lua_remove(s.l, C.int(index))
}