48 lines
1.5 KiB
Go
48 lines
1.5 KiB
Go
package deepmerge
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import (
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"errors"
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)
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var (
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ErrKeyWithPrimitiveValueDefinedMoreThanOnce = errors.New("error due to parameter with value of primitive type: only maps and slices/arrays can be merged, which means you cannot have define the same key twice for parameters that are not maps or slices/arrays")
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)
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func DeepMerge(dst, src map[string]interface{}, config Config) error {
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for srcKey, srcValue := range src {
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if srcValueAsMap, ok := srcValue.(map[string]interface{}); ok { // handle maps
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if dstValue, ok := dst[srcKey]; ok {
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if dstValueAsMap, ok := dstValue.(map[string]interface{}); ok {
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err := DeepMerge(dstValueAsMap, srcValueAsMap, config)
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if err != nil {
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return err
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}
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continue
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}
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} else {
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dst[srcKey] = make(map[string]interface{})
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}
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err := DeepMerge(dst[srcKey].(map[string]interface{}), srcValueAsMap, config)
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if err != nil {
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return err
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}
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} else if srcValueAsSlice, ok := srcValue.([]interface{}); ok { // handle slices
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if dstValue, ok := dst[srcKey]; ok {
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if dstValueAsSlice, ok := dstValue.([]interface{}); ok {
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// If both src and dst are slices, we'll copy the elements from that src slice over to the dst slice
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dst[srcKey] = append(dstValueAsSlice, srcValueAsSlice...)
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continue
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}
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}
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dst[srcKey] = srcValueAsSlice
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} else { // handle primitives
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if config.PreventMultipleDefinitionsOfKeysWithPrimitiveValue {
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if _, ok := dst[srcKey]; ok {
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return ErrKeyWithPrimitiveValueDefinedMoreThanOnce
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}
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}
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dst[srcKey] = srcValue
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}
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}
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return nil
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}
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