// UnmarshalTable applies the contents of an ast.Table to the value pointed at by v.
//
// UnmarshalTable will mapped to v that according to following rules:
//
// TOML strings to string
// TOML integers to any int type
// TOML floats to float32 or float64
// TOML booleans to bool
// TOML datetimes to time.Time
// TOML arrays to any type of slice or []interface{}
// TOML tables to struct
// TOML array of tables to slice of struct
func UnmarshalTable(t *ast.Table, v interface{}) (err error) {
if v == nil {
return fmt.Errorf("v must not be nil")
}
rv := reflect.ValueOf(v)
if kind := rv.Kind(); kind != reflect.Ptr && kind != reflect.Map {
return fmt.Errorf("v must be a pointer or map")
}
for rv.Kind() == reflect.Ptr {
rv = rv.Elem()
}
for key, val := range t.Fields {
switch av := val.(type) {
case *ast.KeyValue:
fv, fieldName, found := findField(rv, key)
if !found {
return fmt.Errorf("line %d: field corresponding to `%s' is not defined in `%T'", av.Line, key, v)
}
switch fv.Kind() {
case reflect.Map:
mv := reflect.New(fv.Type().Elem()).Elem()
if err := UnmarshalTable(t, mv.Addr().Interface()); err != nil {
return err
}
fv.SetMapIndex(reflect.ValueOf(fieldName), mv)
default:
if err := setValue(fv, av.Value); err != nil {
return fmt.Errorf("line %d: %v.%s: %v", av.Line, rv.Type(), fieldName, err)
}
if rv.Kind() == reflect.Map {
rv.SetMapIndex(reflect.ValueOf(fieldName), fv)
}
}
case *ast.Table:
fv, fieldName, found := findField(rv, key)
if !found {
return fmt.Errorf("line %d: field corresponding to `%s' is not defined in `%T'", av.Line, key, v)
}
if err, ok := setUnmarshaler(fv, string(av.Data)); ok {
if err != nil {
return err
}
continue
}
for fv.Kind() == reflect.Ptr {
fv.Set(reflect.New(fv.Type().Elem()))
fv = fv.Elem()
}
switch fv.Kind() {
case reflect.Struct:
vv := reflect.New(fv.Type()).Elem()
if err := UnmarshalTable(av, vv.Addr().Interface()); err != nil {
return err
}
fv.Set(vv)
if rv.Kind() == reflect.Map {
rv.SetMapIndex(reflect.ValueOf(fieldName), fv)
}
case reflect.Map:
mv := reflect.MakeMap(fv.Type())
if err := UnmarshalTable(av, mv.Interface()); err != nil {
return err
}
fv.Set(mv)
default:
return fmt.Errorf("line %d: `%v.%s' must be struct or map, but %v given", av.Line, rv.Type(), fieldName, fv.Kind())
}
case []*ast.Table:
fv, fieldName, found := findField(rv, key)
if !found {
return fmt.Errorf("line %d: field corresponding to `%s' is not defined in `%T'", av[0].Line, key, v)
}
data := make([]string, 0, len(av))
for _, tbl := range av {
data = append(data, string(tbl.Data))
}
if err, ok := setUnmarshaler(fv, strings.Join(data, "\n")); ok {
if err != nil {
return err
}
continue
}
t := fv.Type().Elem()
pc := 0
for ; t.Kind() == reflect.Ptr; pc++ {
t = t.Elem()
}
if fv.Kind() != reflect.Slice {
return fmt.Errorf("line %d: `%v.%s' must be slice type, but %v given", av[0].Line, rv.Type(), fieldName, fv.Kind())
}
for _, tbl := range av {
var vv reflect.Value
switch t.Kind() {
case reflect.Map:
vv = reflect.MakeMap(t)
if err := UnmarshalTable(tbl, vv.Interface()); err != nil {
return err
}
default:
vv = reflect.New(t).Elem()
if err := UnmarshalTable(tbl, vv.Addr().Interface()); err != nil {
return err
}
}
for i := 0; i < pc; i++ {
vv = vv.Addr()
pv := reflect.New(vv.Type()).Elem()
pv.Set(vv)
vv = pv
}
fv.Set(reflect.Append(fv, vv))
}
if rv.Kind() == reflect.Map {
rv.SetMapIndex(reflect.ValueOf(fieldName), fv)
}
default:
return fmt.Errorf("BUG: unknown type `%T'", t)
}
}
return nil
}
