poetrasapoetra
70 lines
1.4 KiB
Go
70 lines
1.4 KiB
Go
package patient
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import (
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"reflect"
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"strings"
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)
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func SetPatient(dst, src interface{}, preserve map[string]bool) {
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dv := reflect.ValueOf(dst).Elem()
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sv := reflect.ValueOf(src).Elem()
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for i := 0; i < dv.NumField(); i++ {
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f := dv.Type().Field(i)
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fieldName := f.Name
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// skip preserved fields
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if preserve[fieldName] {
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continue
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}
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df := dv.Field(i)
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sf := sv.Field(i)
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if !df.CanSet() {
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// skip unexported skip
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continue
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}
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switch df.Kind() {
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case reflect.Struct:
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nestedPreserve := map[string]bool{}
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for key := range preserve {
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if strings.HasPrefix(key, fieldName+".") {
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nestedPreserve[strings.TrimPrefix(key, fieldName+".")] = true
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}
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}
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SetPatient(df.Addr().Interface(), sf.Addr().Interface(), nestedPreserve)
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case reflect.Pointer:
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// Check if pointer points to a struct
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if df.Type().Elem().Kind() == reflect.Struct {
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if sf.IsNil() {
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break
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}
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// If dest pointer is nil, allocate it
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if df.IsNil() {
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df.Set(reflect.New(df.Type().Elem()))
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}
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// Recurse into struct via Elem()
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nestedPreserve := map[string]bool{}
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for key := range preserve {
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if strings.HasPrefix(key, fieldName+".") {
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nestedPreserve[strings.TrimPrefix(key, fieldName+".")] = true
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}
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}
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SetPatient(df.Elem().Addr().Interface(), sf.Elem().Addr().Interface(), nestedPreserve)
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}
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default:
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// Overwrite only when src has non-zero value
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if !sf.IsZero() {
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df.Set(sf)
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}
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}
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}
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}
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