mirror of https://github.com/docker/cli.git
53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
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package mergemaps
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import "encoding/json"
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// Merge recursively merges map `fromMap` into map `ToMap`. Any pre-existing values
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// in ToMap are overwritten. Values in fromMap are added to ToMap.
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// From http://stackoverflow.com/questions/40491438/merging-two-json-strings-in-golang
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func Merge(fromMap, ToMap interface{}) interface{} {
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switch fromMap := fromMap.(type) {
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case map[string]interface{}:
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ToMap, ok := ToMap.(map[string]interface{})
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if !ok {
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return fromMap
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}
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for keyToMap, valueToMap := range ToMap {
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if valueFromMap, ok := fromMap[keyToMap]; ok {
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fromMap[keyToMap] = Merge(valueFromMap, valueToMap)
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} else {
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fromMap[keyToMap] = valueToMap
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}
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}
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case nil:
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// merge(nil, map[string]interface{...}) -> map[string]interface{...}
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ToMap, ok := ToMap.(map[string]interface{})
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if ok {
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return ToMap
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}
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}
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return fromMap
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}
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// MergeJSON merges the contents of a JSON string into an object representation,
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// returning a new object suitable for translating to JSON.
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func MergeJSON(object interface{}, additionalJSON []byte) (interface{}, error) {
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if len(additionalJSON) == 0 {
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return object, nil
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}
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objectJSON, err := json.Marshal(object)
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if err != nil {
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return nil, err
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}
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var objectMap, newMap map[string]interface{}
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err = json.Unmarshal(objectJSON, &objectMap)
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if err != nil {
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return nil, err
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}
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err = json.Unmarshal(additionalJSON, &newMap)
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if err != nil {
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return nil, err
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}
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return Merge(newMap, objectMap), nil
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}
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