func popMap(L *lua.State) map[string]interface{} {
m := make(map[string]interface{})
L.PushNil()
for L.Next(-2) != 0 {
if L.IsString(-2) {
var v interface{}
if L.IsBoolean(-1) {
v = L.ToBoolean(-1)
} else if L.IsNumber(-1) {
var t float64
t = L.ToNumber(-1)
if t == float64(int64(t)) {
v = int(t)
} else {
v = t
}
} else if L.IsString(-1) {
v = L.ToString(-1)
} else if L.IsNil(-1) {
v = nil
} else if L.IsTable(-1) {
v = popMap(L)
}
m[L.ToString(-2)] = v
}
L.Pop(1)
}
return m
}
// Convert a Lua value 'idx' on the stack to the Go value of desired type 't'. Handles
// numerical and string types in a straightforward way, and will convert tables to
// either map or slice types.
func LuaToGo(L *lua.State, t reflect.Type, idx int) interface{} {
var value interface{}
var kind reflect.Kind
if t != nil { // let the Lua type drive the conversion...
if t.Kind() == reflect.Ptr {
kind = t.Elem().Kind()
} else if t.Kind() == reflect.Interface {
t = nil
} else {
kind = t.Kind()
}
}
switch L.Type(idx) {
case lua.LUA_TNIL:
if t == nil {
return nil
}
switch kind {
default:
cannotConvert(L, idx, "nil", kind, t)
}
case lua.LUA_TBOOLEAN:
if t == nil {
kind = reflect.Bool
}
switch kind {
case reflect.Bool:
{
ptr := new(bool)
*ptr = bool(L.ToBoolean(idx))
value = *ptr
}
default:
cannotConvert(L, idx, "bool", kind, t)
}
case lua.LUA_TSTRING:
if t == nil {
kind = reflect.String
}
switch kind {
case reflect.String:
{
tos := L.ToString(idx)
ptr := new(string)
*ptr = tos
value = *ptr
}
default:
cannotConvert(L, idx, "string", kind, t)
}
case lua.LUA_TNUMBER:
if t == nil {
kind = reflect.Float64
}
switch kind {
case reflect.Float64:
{
ptr := new(float64)
*ptr = L.ToNumber(idx)
value = *ptr
}
case reflect.Float32:
{
ptr := new(float32)
*ptr = float32(L.ToNumber(idx))
value = *ptr
}
case reflect.Int:
{
ptr := new(int)
*ptr = int(L.ToNumber(idx))
value = *ptr
}
case reflect.Int8:
{
ptr := new(int8)
*ptr = int8(L.ToNumber(idx))
value = *ptr
}
case reflect.Int16:
{
ptr := new(int16)
*ptr = int16(L.ToNumber(idx))
value = *ptr
}
case reflect.Int32:
{
ptr := new(int32)
*ptr = int32(L.ToNumber(idx))
value = *ptr
}
case reflect.Int64:
{
ptr := new(int64)
*ptr = int64(L.ToNumber(idx))
value = *ptr
}
case reflect.Uint:
{
ptr := new(uint)
*ptr = uint(L.ToNumber(idx))
value = *ptr
}
case reflect.Uint8:
{
ptr := new(uint8)
*ptr = uint8(L.ToNumber(idx))
value = *ptr
}
case reflect.Uint16:
{
ptr := new(uint16)
*ptr = uint16(L.ToNumber(idx))
value = *ptr
}
case reflect.Uint32:
{
ptr := new(uint32)
*ptr = uint32(L.ToNumber(idx))
value = *ptr
}
case reflect.Uint64:
{
ptr := new(uint64)
*ptr = uint64(L.ToNumber(idx))
value = *ptr
}
default:
cannotConvert(L, idx, "number", kind, t)
}
case lua.LUA_TTABLE:
if t == nil {
kind = reflect.Interface
}
fallthrough
default:
istable := L.IsTable(idx)
// if we don't know the type and the Lua object is userdata,
// then it might be a proxy for a Go object. Otherwise wrap
// it up as a LuaObject.
if t == nil && !istable {
if isValueProxy(L, idx) {
return unwrapProxy(L, idx)
} else {
return NewLuaObject(L, idx)
}
}
switch kind {
case reflect.Slice:
{
// if we get a table, then copy its values to a new slice
if istable {
value = CopyTableToSlice(L, t, idx)
} else {
value = unwrapProxyOrComplain(L, idx)
}
}
case reflect.Map:
{
if istable {
value = CopyTableToMap(L, t, idx)
} else {
value = unwrapProxyOrComplain(L, idx)
}
}
case reflect.Struct:
{
if istable {
value = CopyTableToStruct(L, t, idx)
} else {
value = unwrapProxyOrComplain(L, idx)
}
}
case reflect.Interface:
{
if istable {
// have to make an executive decision here: tables with non-zero
// length are assumed to be slices!
if L.ObjLen(idx) > 0 {
value = CopyTableToSlice(L, nil, idx)
} else {
value = CopyTableToMap(L, nil, idx)
}
} else if L.IsNumber(idx) {
value = L.ToNumber(idx)
} else if L.IsString(idx) {
value = L.ToString(idx)
} else if L.IsBoolean(idx) {
value = L.ToBoolean(idx)
} else if L.IsNil(idx) {
return nil
} else {
value = unwrapProxyOrComplain(L, idx)
}
}
default:
value = unwrapProxyOrComplain(L, idx)
//cannotConvert(L,idx,"unknown",kind,t)
}
}
return value
}
func luaToGo(L *lua.State, t reflect.Type, idx int, visited map[uintptr]interface{}) interface{} {
var value interface{}
var kind reflect.Kind
if t != nil {
if t.Kind() == reflect.Ptr {
kind = t.Elem().Kind()
} else if t.Kind() == reflect.Interface {
// Let the Lua type drive the conversion.
t = nil
} else {
kind = t.Kind()
}
}
switch L.Type(idx) {
case lua.LUA_TNIL:
if t == nil {
return nil
}
switch kind {
default:
value = reflect.Zero(t).Interface()
}
case lua.LUA_TBOOLEAN:
if t == nil {
kind = reflect.Bool
}
switch kind {
case reflect.Bool:
ptr := new(bool)
*ptr = L.ToBoolean(idx)
value = *ptr
default:
value = reflect.Zero(t).Interface()
}
case lua.LUA_TSTRING:
if t == nil {
kind = reflect.String
}
switch kind {
case reflect.String:
tos := L.ToString(idx)
ptr := new(string)
*ptr = tos
value = *ptr
default:
value = reflect.Zero(t).Interface()
}
case lua.LUA_TNUMBER:
if t == nil {
// Infering the type here (e.g. int if round value) would break backward
// compatibility and drift away from Lua's design: the numeric type is
// specified at compile time.
kind = reflect.Float64
}
switch kind {
case reflect.Float64:
ptr := new(float64)
*ptr = L.ToNumber(idx)
value = *ptr
case reflect.Float32:
ptr := new(float32)
*ptr = float32(L.ToNumber(idx))
value = *ptr
case reflect.Int:
ptr := new(int)
*ptr = int(L.ToNumber(idx))
value = *ptr
case reflect.Int8:
ptr := new(int8)
*ptr = int8(L.ToNumber(idx))
value = *ptr
case reflect.Int16:
ptr := new(int16)
*ptr = int16(L.ToNumber(idx))
value = *ptr
case reflect.Int32:
ptr := new(int32)
*ptr = int32(L.ToNumber(idx))
value = *ptr
case reflect.Int64:
ptr := new(int64)
*ptr = int64(L.ToNumber(idx))
value = *ptr
case reflect.Uint:
ptr := new(uint)
*ptr = uint(L.ToNumber(idx))
value = *ptr
case reflect.Uint8:
ptr := new(uint8)
*ptr = uint8(L.ToNumber(idx))
value = *ptr
case reflect.Uint16:
ptr := new(uint16)
*ptr = uint16(L.ToNumber(idx))
value = *ptr
case reflect.Uint32:
ptr := new(uint32)
*ptr = uint32(L.ToNumber(idx))
value = *ptr
case reflect.Uint64:
ptr := new(uint64)
*ptr = uint64(L.ToNumber(idx))
value = *ptr
default:
value = reflect.Zero(t).Interface()
}
case lua.LUA_TTABLE:
if t == nil {
kind = reflect.Interface
}
fallthrough
default:
istable := L.IsTable(idx)
// If we don't know the type and the Lua object is userdata,
// then it might be a proxy for a Go object. Otherwise wrap
// it up as a LuaObject.
if t == nil && !istable {
if isValueProxy(L, idx) {
v, _ := valueOfProxy(L, idx)
return v.Interface()
}
return NewLuaObject(L, idx)
}
switch kind {
case reflect.Array:
if istable {
ptr := L.ToPointer(idx)
if val, ok := visited[ptr]; ok {
return val
}
value = copyTableToSlice(L, t, idx, visited)
} else {
value = mustUnwrapProxy(L, idx)
}
case reflect.Slice:
// if we get a table, then copy its values to a new slice
if istable {
ptr := L.ToPointer(idx)
if val, ok := visited[ptr]; ok {
return val
}
value = copyTableToSlice(L, t, idx, visited)
} else {
value = mustUnwrapProxy(L, idx)
}
case reflect.Map:
if istable {
ptr := L.ToPointer(idx)
if val, ok := visited[ptr]; ok {
return val
}
value = copyTableToMap(L, t, idx, visited)
} else {
value = mustUnwrapProxy(L, idx)
}
case reflect.Struct:
if istable {
ptr := L.ToPointer(idx)
if val, ok := visited[ptr]; ok {
return val
}
value = copyTableToStruct(L, t, idx, visited)
} else {
value = mustUnwrapProxy(L, idx)
}
case reflect.Interface:
if istable {
ptr := L.ToPointer(idx)
if val, ok := visited[ptr]; ok {
return val
}
// We have to make an executive decision here: tables with non-zero
// length are assumed to be slices!
if L.ObjLen(idx) > 0 {
value = copyTableToSlice(L, nil, idx, visited)
} else {
value = copyTableToMap(L, nil, idx, visited)
}
} else if L.IsNumber(idx) {
value = L.ToNumber(idx)
} else if L.IsString(idx) {
value = L.ToString(idx)
} else if L.IsBoolean(idx) {
value = L.ToBoolean(idx)
} else if L.IsNil(idx) {
return nil
} else {
value = mustUnwrapProxy(L, idx)
}
default:
value = mustUnwrapProxy(L, idx)
}
}
return value
}
// Convert a Lua value 'idx' on the stack to the Go value of desired type 't'. Handles
// numerical and string types in a straightforward way, and will convert tables to
// either map or slice types.
func LuaToGo(L *lua.State, t reflect.Type, idx int) interface{} {
var value interface{}
var kind reflect.Kind
if t == nil { // let the Lua type drive the conversion...
switch L.Type(idx) {
case lua.LUA_TNIL:
return nil // well, d'oh
case lua.LUA_TBOOLEAN:
kind = reflect.Bool
case lua.LUA_TSTRING:
kind = reflect.String
case lua.LUA_TTABLE:
kind = reflect.Interface
default:
return NewLuaObject(L, idx)
}
} else if t.Kind() == reflect.Ptr {
kind = t.Elem().Kind()
} else {
kind = t.Kind()
}
switch kind {
// various numerical types are tedious but straightforward
case reflect.Float64:
{
ptr := new(float64)
*ptr = L.ToNumber(idx)
value = *ptr
}
case reflect.Float32:
{
ptr := new(float32)
*ptr = float32(L.ToNumber(idx))
value = *ptr
}
case reflect.Int:
{
ptr := new(int)
*ptr = int(L.ToNumber(idx))
value = *ptr
}
case reflect.Int8:
{
ptr := new(byte)
*ptr = byte(L.ToNumber(idx))
value = *ptr
}
case reflect.String:
{
tos := L.ToString(idx)
ptr := new(string)
*ptr = tos
value = *ptr
}
case reflect.Bool:
{
ptr := new(bool)
*ptr = bool(L.ToBoolean(idx))
value = *ptr
}
case reflect.Slice:
{
// if we get a table, then copy its values to a new slice
if L.IsTable(idx) {
value = CopyTableToSlice(L, t, idx)
} else {
value = unwrapProxy(L, idx)
}
}
case reflect.Map:
{
if L.IsTable(idx) {
value = CopyTableToMap(L, t, idx)
} else {
value = unwrapProxy(L, idx)
}
}
case reflect.Struct:
{
if L.IsTable(idx) {
value = CopyTableToStruct(L, t, idx)
} else {
value = unwrapProxy(L, idx)
}
}
case reflect.Interface:
{
if L.IsTable(idx) {
// have to make an executive decision here: tables with non-zero
// length are assumed to be slices!
if L.ObjLen(idx) > 0 {
value = CopyTableToSlice(L, nil, idx)
} else {
value = CopyTableToMap(L, nil, idx)
}
} else if L.IsNumber(idx) {
value = L.ToNumber(idx)
} else if L.IsString(idx) {
value = L.ToString(idx)
} else if L.IsBoolean(idx) {
value = L.ToBoolean(idx)
} else {
value = unwrapProxy(L, idx)
}
}
default:
{
fmt.Println("unhandled type", t)
value = 20
}
}
return value
}
