Golang State.GetGlobal方法代碼示例

func outputNumbersToStrings(L *lua.State) {
	L.GetGlobal("output")

	if !L.IsTable(-1) {
		L.NewTable()
		L.SetGlobal("output")
	}

	L.GetField(-1, "tags")
	if L.IsTable(-1) {
		// First key.
		L.PushNil()
		for L.Next(-2) != 0 {
			// Use 'key' at index -2 and 'value' at index -1.
			if L.IsString(-2) && L.IsString(-1) {
				// Convert numbers to strings.
				L.ToString(-1)
				L.SetField(-3, L.ToString(-2))
			} else {
				// Remove 'value' and keep 'key' for next iteration.
				L.Pop(1)
			}
		}
	}
	L.Pop(1)

	L.Pop(1)
}

func GetTasklistFromLua(L *lua.State) *Tasklist {
	L.CheckStack(1)
	L.GetGlobal(TASKLIST)
	rawptr := L.ToUserdata(-1)
	var ptr **Tasklist = (**Tasklist)(rawptr)
	L.Pop(1)
	return *ptr
}

// Registers a Go function as a global variable and add it to the sandbox.
func sandboxRegister(L *lua.State, name string, f interface{}) {
	goToLua(L, name, f)

	L.PushString(registryWhitelist)
	L.GetTable(lua.LUA_REGISTRYINDEX)
	L.GetGlobal(name)
	L.SetField(-2, name)
}

func GetEntryFromLua(L *lua.State, name string, fname string) *Entry {
	L.CheckStack(1)
	L.GetGlobal(name)
	rawptr := L.ToUserdata(-1)
	var ptr **Entry = (**Entry)(rawptr)
	L.Pop(1)
	if ptr == nil {
		panic(errors.New("No cursor set, can not use " + fname))
	}
	return *ptr

}

// look up a Lua value by its full name. If idx is 0, then this name
// is assumed to start in the global table, e.g. "string.gsub".
// With non-zero idx, can be used to look up subfields of a table
func Lookup(L *lua.State, path string, idx int) {
	parts := strings.Split(path, ".")
	if idx != 0 {
		L.PushValue(idx)
	} else {
		L.GetGlobal("_G")
	}
	for _, field := range parts {
		L.GetField(-1, field)
		L.Remove(-2) // remove table
	}
}

func (p ProbeRunner) Run() {
	var err error
	var state *lua.State
	var fun *luar.LuaObject
	var res interface{}

	r := p.Error

	args := make(map[string]interface{})

	if err = json.Unmarshal([]byte(p.Probe.Arguments), &args); err != nil {
		goto out
	}

	state = mkstate()
	defer state.Close()

	err = state.DoString(fmt.Sprintf("fun = function(args) %s end", p.Script.Code))
	if err != nil {
		goto out
	}

	state.GetGlobal("fun")
	fun = luar.NewLuaObject(state, -1)

	if res, err = fun.Call(args); err != nil {
		goto out
	} else if res == nil {
		// if nil, that means no error. just go to out.
		goto out
	} else if status, ok := res.(string); !ok {
		// if it's not a string, that's bad. luar seems to convert go errors to strings..
		err = fmt.Errorf("script resulted in non-string return value %q", res)
	} else if status != "" {
		// if the string is not empty that's an error.
		err = fmt.Errorf("probe error: %s", status)
	}

out:
	r <- err
	close(r)
}

func register(L *lua.State, table string, values Map, convertFun bool) {
	pop := true
	if table == "*" {
		pop = false
	} else if len(table) > 0 {
		L.GetGlobal(table)
		if L.IsNil(-1) {
			L.NewTable()
			L.SetGlobal(table)
			L.GetGlobal(table)
		}
	} else {
		L.GetGlobal("_G")
	}
	for name, val := range values {
		t := reflect.TypeOf(val)
		if t.Kind() == reflect.Func {
			if convertFun {
				L.PushGoFunction(GoLuaFunc(L, val))
			} else {
				lf := val.(func(*lua.State) int)
				L.PushGoFunction(lf)
			}
		} else {
			GoToLua(L, t, valueOf(val), false)
		}
		L.SetField(-2, name)
	}
	if pop {
		L.Pop(1)
	}
}

func installWorld(state *lua.State) {
	log.Println("Installing world")
	printStackTypes(state)

	state.NewMetaTable(ThingMetaTableName)         // ( -- mtbl )
	state.SetMetaMethod("__index", MessThingIndex) // ( mtbl -- mtbl )
	state.Pop(1)                                   // ( mtbl -- )

	worldTable := map[string]interface{}{
	/*
		"Root":
		"Create": func...
	*/
	}
	pushValue(state, worldTable)

	// Install Thing types as singleton sentinel values. As userdata, these will only compare if the values are exactly equal.
	state.NewUserdata(uintptr(0))
	state.SetField(-2, "Player")
	state.NewUserdata(uintptr(0))
	state.SetField(-2, "Place")
	state.NewUserdata(uintptr(0))
	state.SetField(-2, "Program")
	state.NewUserdata(uintptr(0))
	state.SetField(-2, "Action")
	state.NewUserdata(uintptr(0))
	state.SetField(-2, "Thing")

	state.SetGlobal("world")

	state.GetGlobal("table") // ( -- tblTable )
	state.PushGoFunction(TableFormat)
	state.SetField(-2, "format")
	state.Pop(1) // ( tblTable -- )

	log.Println("Finished installing world")
	printStackTypes(state)
}

// Register makes a number of Go values available in Lua code.
// 'values' is a map of strings to Go values.
//
// - If table is non-nil, then create or reuse a global table of that name and
// put the values in it.
//
// - If table is '' then put the values in the global table (_G).
//
// - If table is '*' then assume that the table is already on the stack.
func Register(L *lua.State, table string, values Map) {
	pop := true
	if table == "*" {
		pop = false
	} else if len(table) > 0 {
		L.GetGlobal(table)
		if L.IsNil(-1) {
			L.NewTable()
			L.SetGlobal(table)
			L.GetGlobal(table)
		}
	} else {
		L.GetGlobal("_G")
	}
	for name, val := range values {
		GoToLua(L, nil, reflect.ValueOf(val), false)
		L.SetField(-2, name)
	}
	if pop {
		L.Pop(1)
	}
}

// new LuaObject refering to the global environment
func Global(L *lua.State) *LuaObject {
	L.GetGlobal("_G")
	val := NewLuaObject(L, -1)
	L.Pop(1)
	return val
}

func register(L *lua.State, table string, values Map, convertFun bool) {
	pop := true
	if table == "*" {
		pop = false
	} else if len(table) > 0 {
		L.GetGlobal(table)
		if L.IsNil(-1) {
			L.NewTable()
			L.SetGlobal(table)
			L.GetGlobal(table)
		}
	} else {
		L.GetGlobal("_G")
	}
	for name, val := range values {
		t := reflect.TypeOf(val)
		if t.Kind() == reflect.Func {
			if convertFun {
				L.PushGoFunction(GoLuaFunc(L, val))
			} else {
				lf := val.(func(*lua.State) int)
				L.PushGoFunction(lf)
			}
		} else {
			GoToLua(L, t, valueOf(val), false)
		}
		L.SetField(-2, name)

		if t.Kind() == reflect.Func {
			var lf func(*lua.State) int
			if convertFun {
				lf = GoLuaFunc(L, val)
			} else {
				lf = val.(func(*lua.State) int)
			}
			L.PushGoFunction(func(L *lua.State) (ret int) {
				defer func() {
					if err2 := recover(); err2 != nil {
						GoToLua(L, typeof(err2), valueOf(err2), false)
						ret = 1
						return
					}
				}()

				ret = lf(L)
				pos := L.GetTop() - ret + 1
				L.PushNil()
				L.Insert(pos)

				for i := 0; i < L.GetTop(); i++ {
					fmt.Println(L.Typename(int(L.Type(i + 1))))
				}
				return ret + 1
			})
			L.SetField(-2, "safe_"+name)
		}
	}
	if pop {
		L.Pop(1)
	}
}

func pushValue(state *lua.State, value interface{}) error {
	switch v := value.(type) {
	default:
		return fmt.Errorf("An item of unknown type was included in the environment or arguments of a Lua call (skipping it): %v",
			value)
	case nil:
		log.Println("Pushing nil onto lua stack")
		state.PushNil()
	case string:
		log.Println("Pushing string onto lua stack")
		state.PushString(v)
	case int:
		log.Println("Pushing int onto lua stack")
		state.PushInteger(int64(v))
	case int64:
		log.Println("Pushing int64 onto lua stack")
		state.PushInteger(v)
	case float64:
		log.Println("Pushing float64 onto lua stack")
		state.PushNumber(v)
	case bool:
		log.Println("Pushing bool onto lua stack")
		state.PushBoolean(v)

	case map[string]interface{}:
		log.Println("Pushing map[string]interface{} onto lua stack")
		state.CreateTable(0, len(v))
		for name, value := range v {
			err := pushValue(state, value)
			if err != nil {
				// error means nothing was added to stack. So pop our new table so *we* leave nothing added to the stack.
				state.Pop(1)
				return err
			}
			state.SetField(-2, name)
		}
		// then leave the table on the stack

	case ThingType:
		// These are singleton sentinel values, so load them from Lua-land.
		state.GetGlobal("world")
		state.GetField(-1, strings.Title(v.String()))
		state.Remove(-2)

	case *Thing:
		log.Println("Pushing *Thing onto lua stack")
		return pushValue(state, v.Id)
	case ThingId:
		log.Println("Pushing ThingId onto lua stack")
		// We're pushing a ThingId, so make a new userdata for it, with the Thing metatable.
		userdata := state.NewUserdata(uintptr(unsafe.Sizeof(int64(0))))
		thingPtr := (*int64)(userdata)
		*thingPtr = int64(v)
		if !state.IsUserdata(-1) {
			log.Println("!!! HOGAD JUST PUSHED NEW USERDATA BUT IT ISN'T OMG !!!")
		}
		log.Println("Pushed ThingId", *thingPtr, "onto lua stack")

		// Now make it act like a Thing.
		state.LGetMetaTable(ThingMetaTableName) // ( udata -- udata mtbl )
		state.SetMetaTable(-2)                  // ( udata mtbl -- udata )

		// Let's just check that it's that, for sures.
		if !state.IsUserdata(-1) {
			log.Println("!!! WOOP WOOP DID NOT SET METATABLE RIGHT :( !!!")
		}
	}
	return nil
}

// 'exist' is optional.
func run(L *lua.State, registryIndex string, code string, input *inputInfo, output *outputInfo, exist *inputInfo) error {
	// Restore the sandbox.
	err := L.DoString(luaRestoreSandbox)
	if err != nil {
		log.Fatal("Cannot load function to restore sandbox", err)
	}
	L.PushString(registryWhitelist)
	L.GetTable(lua.LUA_REGISTRYINDEX)
	err = L.Call(1, 0)
	if err != nil {
		log.Fatal("Failed to restore sandbox", err)
	}

	goToLua(L, "input", *input)
	goToLua(L, "output", *output)

	if exist != nil {
		goToLua(L, "existinfo", *exist)
	}

	// Shortcut (mostly for prescript and postscript).
	L.GetGlobal("input")
	L.GetField(-1, "tags")
	L.SetGlobal("i")
	L.Pop(1)
	L.GetGlobal("output")
	L.GetField(-1, "tags")
	L.SetGlobal("o")
	L.Pop(1)

	// Call the compiled script.
	L.PushString(registryIndex)
	L.GetTable(lua.LUA_REGISTRYINDEX)
	L.PushString(code)
	if L.IsTable(-2) {
		L.GetTable(-2)
		if L.IsFunction(-1) {
			err := L.Call(0, 0)
			if err != nil {
				L.SetTop(0)
				return fmt.Errorf("%s", err)
			}
		} else {
			L.Pop(1)
		}
	} else {
		L.Pop(1)
	}
	L.Pop(1)

	// Allow tags to be numbers for convenience.
	outputNumbersToStrings(L)

	L.GetGlobal("output")
	r := luar.LuaToGo(L, reflect.TypeOf(*output), -1)
	L.Pop(1)

	*output = r.(outputInfo)

	return nil
}