func (lua *Lua) toGoValue(i C.int, paramType reflect.Type) (ret reflect.Value) {
luaType := C.lua_type(lua.State, i)
paramKind := paramType.Kind()
switch paramKind {
case reflect.Bool:
if luaType != C.LUA_TBOOLEAN {
lua.Panic("not a boolean")
}
ret = reflect.ValueOf(C.lua_toboolean(lua.State, i) == C.int(1))
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if luaType != C.LUA_TNUMBER {
lua.Panic("not an integer")
}
ret = reflect.New(paramType).Elem()
ret.SetInt(int64(C.lua_tointegerx(lua.State, i, nil)))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
if luaType != C.LUA_TNUMBER {
lua.Panic("not an unsigned")
}
ret = reflect.New(paramType).Elem()
ret.SetUint(uint64(C.lua_tointegerx(lua.State, i, nil)))
case reflect.Float32, reflect.Float64:
if luaType != C.LUA_TNUMBER {
lua.Panic("not a float")
}
ret = reflect.New(paramType).Elem()
ret.SetFloat(float64(C.lua_tonumberx(lua.State, i, nil)))
case reflect.Interface:
switch luaType {
case C.LUA_TNUMBER:
ret = reflect.New(floatType).Elem()
ret.SetFloat(float64(C.lua_tonumberx(lua.State, i, nil)))
case C.LUA_TSTRING:
ret = reflect.New(stringType).Elem()
ret.SetString(C.GoString(C.lua_tolstring(lua.State, i, nil)))
case C.LUA_TLIGHTUSERDATA:
ret = reflect.ValueOf(C.lua_topointer(lua.State, i))
case C.LUA_TBOOLEAN:
ret = reflect.New(boolType).Elem()
ret.SetBool(C.lua_toboolean(lua.State, i) == C.int(1))
//TODO nil
//TODO table
default:
lua.Panic("wrong interface argument: %v", paramKind)
}
case reflect.String:
if luaType != C.LUA_TSTRING {
lua.Panic("not a string")
}
ret = reflect.New(paramType).Elem()
ret.SetString(C.GoString(C.lua_tolstring(lua.State, i, nil)))
case reflect.Slice:
switch luaType {
case C.LUA_TSTRING:
ret = reflect.New(paramType).Elem()
cstr := C.lua_tolstring(lua.State, i, nil)
ret.SetBytes(C.GoBytes(unsafe.Pointer(cstr), C.int(C.strlen(cstr))))
case C.LUA_TTABLE:
ret = reflect.MakeSlice(paramType, 0, 0)
C.lua_pushnil(lua.State)
elemType := paramType.Elem()
for C.lua_next(lua.State, i) != 0 {
ret = reflect.Append(ret, lua.toGoValue(-1, elemType))
C.lua_settop(lua.State, -2)
}
default:
lua.Panic("wrong slice argument")
}
case reflect.Ptr:
if luaType != C.LUA_TLIGHTUSERDATA {
lua.Panic("not a pointer")
}
pointer := C.lua_topointer(lua.State, i)
ret = reflect.NewAt(paramType, unsafe.Pointer(&pointer)).Elem()
case reflect.Map:
if luaType != C.LUA_TTABLE {
lua.Panic("not a map")
}
ret = reflect.MakeMap(paramType)
C.lua_pushnil(lua.State)
keyType := paramType.Key()
elemType := paramType.Elem()
for C.lua_next(lua.State, i) != 0 {
ret.SetMapIndex(
lua.toGoValue(-2, keyType),
lua.toGoValue(-1, elemType))
C.lua_settop(lua.State, -2)
}
case reflect.UnsafePointer:
ret = reflect.ValueOf(C.lua_topointer(lua.State, i))
//TODO complex64/128
//TODO array
//TODO chan
//TODO func
//TODO struct
default:
lua.Panic("unknown argument type %v", paramType)
}
return
}
// Converts the Lua value at the given valid index to a float64. The
// Lua value must be a number or a string convertible to a number; otherwise,
// Tonumber returns 0.
func (this *State) Tonumber(index int) float64 {
return float64(C.lua_tonumberx(this.luastate, C.int(index), nil))
}