func ExampleMap() {
const code = `
print(#M)
print(M.one)
print(M.two)
print(M.three)
`
L := luar.Init()
defer L.Close()
M := luar.Map{
"one": "ein",
"two": "zwei",
"three": "drei",
}
luar.Register(L, "", luar.Map{
"M": M,
"print": fmt.Println,
})
err := L.DoString(code)
if err != nil {
fmt.Println("error", err.Error())
}
// Output:
// 3
// ein
// zwei
// drei
}
func main() {
L := luar.Init()
defer L.Close()
// arbitrary Go functions can be registered
// to be callable from Lua
luar.Register(L, "", luar.Map{
"GoFun": GoFun,
})
res := L.DoString(code)
if !res {
fmt.Println("Error:", L.ToString(-1))
os.Exit(1)
}
res = L.DoString(setup)
if !res {
fmt.Println("Error:", L.ToString(-1))
os.Exit(1)
} else {
// there will be a table on the stack!
fmt.Println("table?", L.IsTable(-1))
v := luar.CopyTableToMap(L, nil, -1)
fmt.Println("returned map", v)
m := v.(map[string]interface{})
for k, v := range m {
fmt.Println(k, v)
}
}
}
func main() {
L := luar.Init()
defer L.Close()
M := luar.Map{
"one": "ein",
"two": "zwei",
"three": "drei",
}
S := []string{"alfred", "alice", "bob", "frodo"}
ST := &MyStruct{"Dolly", 46}
luar.Register(L, "", luar.Map{
"M": M,
"S": S,
"ST": ST,
})
err := L.DoString(code)
if err != nil {
fmt.Println("error", err.Error())
}
}
func main() {
lua := `
fn = function(obj)
slice = obj.GetSlice()
print(type(slice), #slice)
obj = slice[1] -- slice[2] will raise a 'index out of range' error
-- obj.Naam = 'howzit' -- will raise a 'no field' error
name = obj.GetName()
return name
end
`
L := luar.Init()
defer L.Close()
L.DoString(lua)
luafn := luar.NewLuaObjectFromName(L, "fn")
gobj := NewStructWithSlice("string")
res, err := luafn.Call(gobj)
if err != nil {
fmt.Println("error!", err)
} else {
fmt.Println("result", res)
}
}
func Example_pointers() {
const test = `
-- Pointers to structs and structs within pointers are automatically dereferenced.
local t = newRef()
Print(t.Index, t.Number, t.Title)
`
type Ref struct {
Index int
Number *int
Title *string
}
newRef := func() *Ref {
n := new(int)
*n = 10
t := new(string)
*t = "foo"
return &Ref{Index: 17, Number: n, Title: t}
}
L := luar.Init()
defer L.Close()
luar.Register(L, "", luar.Map{
"Print": fmt.Println,
"newRef": newRef,
})
L.DoString(test)
// Output:
// 17 10 foo
}
func main() {
L := luar.Init()
defer L.Close()
L.GetGlobal("print")
print := luar.NewLuaObject(L, -1)
print.Call("one two", 12)
L.GetGlobal("package")
pack := luar.NewLuaObject(L, -1)
fmt.Println(pack.Get("path"))
/*
L.GetGlobal("string")
strtab := luar.NewLuaObject(L,-1)
iter := strtab.Iter()
for iter.Next() {
fmt.Println(iter.Key,iter.Value)
}
*/
gsub := luar.NewLuaObjectFromName(L, "string.gsub")
res, err := gsub.Call("hello $NAME go $HOME", "%$(%u+)", luar.Map{
"NAME": "Dolly",
"HOME": "where you belong",
})
if res == nil {
fmt.Println("error", err)
} else {
fmt.Println("result", res)
}
}
func (PM *PluginManager) initLua() {
PM.L = luar.Init()
luar.RawRegister(PM.L, "", luar.Map{
"RegisterCommand": func(L *lua.State) int {
name := L.ToString(1)
fn := luar.NewLuaObject(L, 2)
PM.Commands[name] = Plugin{name, fn}
log.Printf(" %-10s command\n", name)
return 0
},
"RegisterEvent": func(L *lua.State) int {
name := L.ToString(1)
event := L.ToString(2)
fn := luar.NewLuaObject(L, 3)
if _, ok := PM.Events[event]; !ok {
PM.Events[event] = make(map[string]Plugin)
}
PM.Events[event][name] = Plugin{name, fn}
log.Printf(" %-10s event\n", name)
return 0
},
})
luar.Register(PM.L, "go", luar.Map{
"Split": strings.Split,
"SplitN": strings.SplitN,
"PrintTable": func(table interface{}) {
log.Printf("%#v\n", table)
},
})
}
// Read configuration in Lua format.
//
// WARNING: Deprecated.
func ExampleCopyTableToMap() {
L := luar.Init()
defer L.Close()
err := L.DoString(config)
if err != nil {
log.Fatal(err)
}
// There should be a table on the Lua stack.
if !L.IsTable(-1) {
log.Fatal("no table on stack")
}
v := luar.CopyTableToMap(L, nil, -1)
// Extract table from the returned interface.
m := v.(map[string]interface{})
marked := m["marked"].([]interface{})
options := m["options"].(map[string]interface{})
fmt.Printf("%#v\n", m["baggins"])
fmt.Printf("%#v\n", m["name"])
fmt.Printf("%#v\n", len(marked))
fmt.Printf("%.1f\n", marked[0])
fmt.Printf("%.1f\n", marked[1])
fmt.Printf("%#v\n", options["leave"])
// Output:
// true
// "dumbo"
// 2
// 1.0
// 2.0
// true
}
func ExampleLuaTableIter_Next() {
const code = `
return {
foo = 17,
bar = 18,
}
`
L := luar.Init()
defer L.Close()
err := L.DoString(code)
if err != nil {
log.Fatal(err)
}
lo := luar.NewLuaObject(L, -1)
iter := lo.Iter()
keys := []string{}
values := map[string]float64{}
for iter.Next() {
k := iter.Key.(string)
keys = append(keys, k)
values[k] = iter.Value.(float64)
}
sort.Strings(keys)
for _, v := range keys {
fmt.Println(v, values[v])
}
// Output:
// bar 18
// foo 17
}
func main() {
L := luar.Init()
defer L.Close()
L.GetGlobal("print")
print := luar.NewLuaObject(L, -1)
print.Call("one two", 12)
L.GetGlobal("package")
pack := luar.NewLuaObject(L, -1)
fmt.Println(pack.Get("path"))
lcopy := luar.NewLuaObjectFromValue
gsub := luar.NewLuaObjectFromName(L, "string.gsub")
rmap := lcopy(L, luar.Map{
"NAME": "Dolly",
"HOME": "where you belong",
})
res, err := gsub.Call("hello $NAME go $HOME", "%$(%u+)", rmap)
if res == nil {
fmt.Println("error", err)
} else {
fmt.Println("result", res)
}
}
// TODO: better error handling
func LuaInit() *lua.State {
L := luar.Init()
//L.AtPanic(LuaAtPanic)
L.OpenLibs()
L.DoString("math.randomseed( os.time() )")
return L
}
func NewConf() *Conf {
c := Conf{
l: luar.Init(),
}
c.registerCommands()
return &c
}
func ExampleMakeChan() {
L1 := luar.Init()
defer L1.Close()
L2 := luar.Init()
defer L2.Close()
luar.MakeChan(L1)
L1.SetGlobal("c")
L1.GetGlobal("c")
c := luar.LuaToGo(L1, nil, -1)
luar.Register(L2, "", luar.Map{
"c": c,
"Print": fmt.Println,
})
const code1 = `
c.send(17)
`
const code2 = `
v = c.recv()
Print(v)
`
var wg sync.WaitGroup
wg.Add(1)
go func() {
err := L1.DoString(code1)
if err != nil {
fmt.Println(err)
}
wg.Done()
}()
err := L2.DoString(code2)
if err != nil {
fmt.Println(err)
}
wg.Wait()
// Output:
// 17
}
// mkstate constructs a new lua state with the appropriate functions binded
// for use in scripts.
// it also binds functions used for actions, which should probably go somewhere else.
func mkstate() *lua.State {
L := luar.Init()
luar.Register(L, "", luar.Map{
"connect": lconnect,
"http": lhttp,
})
return L
}
func (r Runtime) InitPlugin(name, source string, implements func(string)) error {
context := luar.Init()
luar.Register(context, "", luar.Map{
"implements": func(interfaceName string) {
implements(interfaceName)
},
})
context.DoString(source)
r.plugins[name] = context
return nil
}
func main() {
L := luar.Init()
defer L.Close()
luar.Register(L, "", luar.Map{
"Print": fmt.Println,
"MSG": "hello", // can also register constants
})
L.DoString(test)
}
func main() {
whj := "wang::hai::jun"
fmt.Println(strings.Split(whj, "::"))
TestCall("111")
L := luar.Init()
defer L.Close()
M := luar.Map{
"one": "ein",
"two": "zwei",
"three": "drei",
}
S := []string{"alfred", "alice", "bob", "frodo"}
ST := &MyStruct{"Dolly", 46}
luar.Register(L, "", luar.Map{
"Print": fmt.Println,
"testcall": TestCall,
"print": fmt.Println,
"MSG": "hello", // can also register constants
"M": M,
"S": S,
"ST": ST,
})
//L.DoString(test)
L.DoString(code)
L.GetGlobal("print")
print := luar.NewLuaObject(L, -1)
print.Call("one two", 12)
L.GetGlobal("package")
pack := luar.NewLuaObject(L, -1)
fmt.Println(pack.Get("path"))
lcopy := luar.NewLuaObjectFromValue
gsub := luar.NewLuaObjectFromName(L, "string.gsub")
rmap := lcopy(L, luar.Map{
"NAME": "Dolly",
"HOME": "where you belong",
})
res, err := gsub.Call("hello $NAME go $HOME", "%$(%u+)", rmap)
if res == nil {
fmt.Println("error", err)
} else {
fmt.Println("\033[0;31mresult\033[0m", res)
}
}
func (luaipt *LuaIpt) Init(path string) error {
luaipt.state = luar.Init()
luaipt.Bind("Debugf", log.Debugf)
luaipt.Bind("Debug", log.Debug)
luaipt.Bind("Messagef", log.Messagef)
luaipt.Bind("Message", log.Message)
luaipt.Bind("Warningf", log.Warningf)
luaipt.Bind("Warning", log.Warning)
luaipt.Bind("Errorf", log.Errorf)
luaipt.Bind("Error", log.Error)
luaipt.path = path
return nil
}
func main() {
L := luar.Init()
defer L.Close()
luar.Register(L, "", luar.Map{
"newT": newT,
})
res := L.DoString(setup)
if res != nil {
fmt.Println("Error:", res)
}
}
func main() {
L := luar.Init()
defer L.Close()
// arbitrary Go functions can be registered
// to be callable from Lua
luar.Register(L, "", luar.Map{
"config": config,
})
res := L.DoString(setup)
if res != nil {
fmt.Println("Error:", res)
}
}
func init() {
piepan.Register("lua", &piepan.Plugin{
Name: "Lua (C)",
New: func(in *piepan.Instance) piepan.Environment {
s := luar.Init()
p := &Plugin{
instance: in,
state: s,
listeners: make(map[string][]*luar.LuaObject),
}
luar.Register(s, "piepan", luar.Map{
"On": p.apiOn,
"Disconnect": p.apiDisconnect,
})
s.GetGlobal("piepan")
s.NewTable()
luar.Register(s, "*", luar.Map{
"Play": p.apiAudioPlay,
"IsPlaying": p.apiAudioIsPlaying,
"Stop": p.apiAudioStop,
"NewTarget": p.apiAudioNewTarget,
"SetTarget": p.apiAudioSetTarget,
"Bitrate": p.apiAudioBitrate,
"SetBitrate": p.apiAudioSetBitrate,
"Volume": p.apiAudioVolume,
"SetVolume": p.apiAudioSetVolume,
})
s.SetField(-2, "Audio")
s.NewTable()
luar.Register(s, "*", luar.Map{
"New": p.apiTimerNew,
})
s.SetField(-2, "Timer")
s.NewTable()
luar.Register(s, "*", luar.Map{
"New": p.apiProcessNew,
})
s.SetField(-2, "Process")
s.SetTop(0)
return p
},
})
}
// WARNING: Deprecated.
func ExampleCopyTableToStruct() {
L := luar.Init()
defer L.Close()
err := L.DoString(config)
if err != nil {
log.Fatal(err)
}
// There should be a table on the Lua stack.
if !L.IsTable(-1) {
log.Fatal("no table on stack")
}
type conf struct {
Baggins bool `lua:"baggins"`
Age int `lua:"age"`
Name string `lua:"name"`
Marked []int `lua:"marked"`
Options struct {
Leave bool `lua:"leave"`
cancel string // Ingored since it is unexported.
Tags map[string]bool `lua:"tags"`
} `lua:"options"`
}
var s conf
v := luar.CopyTableToStruct(L, reflect.TypeOf(s), -1)
s = v.(conf)
fmt.Println(s.Baggins)
fmt.Println(s.Age)
fmt.Println(s.Name)
fmt.Println(s.Marked)
fmt.Println(s.Options.Leave)
fmt.Println(s.Options.Tags["foolish"], s.Options.Tags["strong"])
// Output:
// true
// 24
// dumbo
// [1 2]
// true
// true true
}
func ExampleRegister_sandbox() {
const code = `
Print("foo")
Print(io ~= nil)
Print(os == nil)
`
L := luar.Init()
defer L.Close()
res := L.LoadString(code)
if res != 0 {
msg := L.ToString(-1)
fmt.Println("could not compile", msg)
}
// Create a empty sandbox.
L.NewTable()
// "*" means "use table on top of the stack."
luar.Register(L, "*", luar.Map{
"Print": fmt.Println,
})
env := luar.NewLuaObject(L, -1)
G := luar.Global(L)
// We can copy any Lua object from "G" to env with 'Set', e.g.:
// env.Set("print", G.Get("print"))
// A more convenient and efficient way is to do a bulk copy with 'Setv':
env.Setv(G, "print", "io")
// Set up sandbox.
L.SetfEnv(-2)
// Run 'code' chunk.
err := L.Call(0, 0)
if err != nil {
fmt.Println("could not run", err)
}
// Output:
// foo
// true
// true
}
// This example shows how Go slices and maps are marshalled to Lua tables and
// vice versa. This requires the Lua state to be initialized with `luar.Init()`.
//
// An arbitrary Go function is callable from Lua, and list-like tables become
// slices on the Go side. The Go function returns a map, which is wrapped as a
// proxy object. You can however then copy this to a Lua table explicitly. There
// is also `luar.unproxify` on the Lua side.
func ExampleInit() {
const code = `
-- Lua tables auto-convert to slices.
local res = foo {10,20,30,40}
-- The result is a map-proxy.
print(res['1'], res['2'])
-- Which we may explicitly convert to a table.
res = luar.unproxify(res)
for k,v in pairs(res) do
print(k,v)
end
`
foo := func(args []int) (res map[string]int) {
res = make(map[string]int)
for i, val := range args {
res[strconv.Itoa(i)] = val * val
}
return
}
L := luar.Init()
defer L.Close()
luar.Register(L, "", luar.Map{
"foo": foo,
"print": fmt.Println,
})
res := L.DoString(code)
if res != nil {
fmt.Println("Error:", res)
}
// Output:
// 400 900
// 1 400
// 0 100
// 3 1600
// 2 900
}
func ExampleNewLuaObjectFromValue() {
L := luar.Init()
defer L.Close()
gsub := luar.NewLuaObjectFromName(L, "string.gsub")
// We do have to explicitly copy the map to a Lua table, because `gsub`
// will not handle userdata types.
gmap := luar.NewLuaObjectFromValue(L, luar.Map{
"NAME": "Dolly",
"HOME": "where you belong",
})
res, err := gsub.Call("hello $NAME go $HOME", "%$(%u+)", gmap)
if err != nil {
log.Fatal(err)
}
fmt.Println(res)
// Output:
// hello Dolly go where you belong
}
// LoadScript finds and loads the appropriate script by a given short name (tetra/die).
func LoadScript(name string) (script *Script, err error) {
kind := strings.Split(name, "/")[0]
client, ok := Services[kind]
if !ok {
return nil, errors.New("Cannot find target service " + kind)
}
if _, present := Scripts[name]; present {
return nil, errors.New("Double script load!")
}
script = &Script{
Name: name,
L: luar.Init(),
Log: log.New(os.Stdout, name+" ", log.LstdFlags),
Handlers: make(map[string]*Handler),
Commands: make(map[string]*Command),
Service: kind,
Client: client,
Uuid: uuid.New(),
Trigger: make(chan []interface{}, 5),
}
script.seed()
script, err = loadLuaScript(script)
if err != nil {
return nil, errors.New("No such script " + name)
}
Scripts[name] = script
Etcd.CreateDir("/tetra/scripts/"+name, 0)
RunHook("SCRIPTLOAD", script)
go script.trigger()
return
}
func main() {
luaCode := `
for i = 1,10 do
MyFunc(MSG,i)
end
`
L := luar.Init()
defer L.Close()
luar.Register(L, "", luar.Map{
//"MyFunc": fmt.Println,
"MyFunc": MyFunc,
"MSG": "Hello, Luar!",
})
err := L.DoString(luaCode)
if err != nil {
panic(err)
}
}
func main() {
L := luar.Init()
defer L.Close()
gettop := func() {
fmt.Println("top", L.GetTop())
}
gettop()
// compile chunk
res := L.LoadString(test)
if res != 0 {
msg := L.ToString(-1)
fmt.Println("could not compile", msg)
}
// create environment for chunk
L.NewTable()
// "*" means use table on stack....
luar.Register(L, "*", luar.Map{
"Print": fmt.Println,
})
env := luar.NewLuaObject(L, -1)
G := luar.Global(L)
//~ env.Set("print",G.Get("print"))
//~ env.Set("io",G.Get("io"))
// more convenient/efficient way to do a bulk copy
env.Setv(G, "print", "io")
L.SetfEnv(-2)
// run chunk
err := L.Call(0, 0)
if err != nil {
fmt.Println("could not run", err)
}
}
// LoadScript finds and loads the appropriate script by a given short name (tetra/die).
func NewScript(name string) (script *Script, err error) {
kind := strings.Split(name, "/")[0]
script = &Script{
Name: name,
L: luar.Init(),
Log: log.New(os.Stdout, name+" ", log.LstdFlags),
Service: kind,
Uuid: uuid.New(),
}
script.seed()
script, err = loadLuaScript(script)
if err != nil {
script, err = loadMoonScript(script)
if err != nil {
return nil, errors.New("No such script " + name)
}
}
return
}
// Slices must be looped with 'ipairs'.
func Example_slices() {
const test = `
for i, v in ipairs(names) do
Print(i, v)
end
`
L := luar.Init()
defer L.Close()
names := []string{"alfred", "alice", "bob", "frodo"}
luar.Register(L, "", luar.Map{
"Print": fmt.Println,
"names": names,
})
L.DoString(test)
// Output:
// 1 alfred
// 2 alice
// 3 bob
// 4 frodo
}