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| // Copyright 2020 Jebbs. All rights reserved.
| // Use of this source code is governed by MIT
| // license that can be found in the LICENSE file.
|
| package merge
|
| import (
| "fmt"
| )
|
| // mergeMaps merges source map into target
| // it supports only map[string]interface{} type for any children of the map tree
| func mergeMaps(target map[string]interface{}, source map[string]interface{}) (err error) {
| for key, value := range source {
| target[key], err = mergeField(target[key], value)
| if err != nil {
| return
| }
| }
| return
| }
|
| func mergeField(target interface{}, source interface{}) (interface{}, error) {
| if source == nil {
| return target, nil
| }
| if target == nil {
| return source, nil
| }
| if slice, ok := source.([]interface{}); ok {
| if tslice, ok := target.([]interface{}); ok {
| tslice = append(tslice, slice...)
| return tslice, nil
| }
| return nil, fmt.Errorf("value type mismatch, source is 'slice' but target not: %s", source)
| } else if smap, ok := source.(map[string]interface{}); ok {
| if tmap, ok := target.(map[string]interface{}); ok {
| err := mergeMaps(tmap, smap)
| return tmap, err
| }
| return nil, fmt.Errorf("value type mismatch, source is 'map[string]interface{}' but target not: %s", source)
| }
| return source, nil
| }
|
|
