Created
March 1, 2018 03:55
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Golang walk through nested structures with formatted, indented output
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| package main | |
| import ( | |
| "fmt" | |
| "reflect" | |
| "strings" | |
| ) | |
| type S1 struct { | |
| A1 int | |
| B1 string | |
| S2 | |
| } | |
| type S2 struct { | |
| A2 int64 | |
| S3 | |
| B2 complex64 | |
| } | |
| type S3 struct { | |
| A3 string | |
| b3 bool | |
| C3 float64 | |
| } | |
| func main() { | |
| s3 := S3{"Third", true, 3.1415926535} | |
| s2 := S2{4123456789, s3, -2 + 3i} | |
| s1 := S1{7, "first", s2} | |
| walkNestedStruct(s1, 0) | |
| } | |
| func walkNestedStruct(ns interface{}, level int) { | |
| nsVal := reflect.ValueOf(ns) | |
| nsType := nsVal.Type() | |
| for i := 0; i < nsVal.NumField(); i++ { | |
| f := nsVal.Field(i) | |
| // Skip unexported fields | |
| if !f.CanInterface() { | |
| continue | |
| } | |
| fmt.Printf("%s%s", strings.Repeat(" ", level), nsType.Field(i).Name) | |
| if f.Kind() == reflect.Struct { | |
| fmt.Println(" {") | |
| walkNestedStruct(f.Interface(), level+4) | |
| fmt.Printf("%s}\n", strings.Repeat(" ", level)) | |
| } else { | |
| fmt.Printf(" %s = %v\n", f.Type(), f.Interface()) | |
| } | |
| } | |
| } |
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