github.com/imannamdari/v2ray-core/v5@v5.0.5/infra/conf/merge/map.go (about)

     1  // Copyright 2020 Jebbs. All rights reserved.
     2  // Use of this source code is governed by MIT
     3  // license that can be found in the LICENSE file.
     4  
     5  package merge
     6  
     7  import (
     8  	"fmt"
     9  	"reflect"
    10  )
    11  
    12  // mergeMaps merges source map into target
    13  // it supports only map[string]interface{} type for any children of the map tree
    14  func mergeMaps(target map[string]interface{}, source map[string]interface{}) (err error) {
    15  	for key, value := range source {
    16  		target[key], err = mergeField(target[key], value)
    17  		if err != nil {
    18  			return
    19  		}
    20  	}
    21  	return
    22  }
    23  
    24  func mergeField(target interface{}, source interface{}) (interface{}, error) {
    25  	if source == nil {
    26  		return target, nil
    27  	}
    28  	if target == nil {
    29  		return source, nil
    30  	}
    31  	if reflect.TypeOf(source) != reflect.TypeOf(target) {
    32  		return nil, fmt.Errorf("type mismatch, expect %T, incoming %T", target, source)
    33  	}
    34  	if slice, ok := source.([]interface{}); ok {
    35  		tslice, _ := target.([]interface{})
    36  		tslice = append(tslice, slice...)
    37  		return tslice, nil
    38  	} else if smap, ok := source.(map[string]interface{}); ok {
    39  		tmap, _ := target.(map[string]interface{})
    40  		err := mergeMaps(tmap, smap)
    41  		return tmap, err
    42  	}
    43  	return source, nil
    44  }