K8SPS-567: automatic yaml generation #1136
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| package fill | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "reflect" | ||
| ) | ||
|
|
||
| // ByType recursively fills zero or nil fields in the given pointer value `v` | ||
| // using provided preset values matched by type. It modifies `v` in place. | ||
| func ByType(v any, presets ...any) error { | ||
| rv := reflect.ValueOf(v) | ||
| if !rv.IsValid() { | ||
| return fmt.Errorf("nil value") | ||
| } | ||
| if rv.Kind() != reflect.Pointer || rv.IsNil() { | ||
| return fmt.Errorf("value must be a non-nil pointer") | ||
| } | ||
| fillValue(rv, buildRules(presets...)) | ||
| return nil | ||
| } | ||
|
|
||
| type rules map[reflect.Type]reflect.Value | ||
|
|
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| func buildRules(presets ...any) rules { | ||
| r := make(rules, len(presets)) | ||
| for _, p := range presets { | ||
| if p == nil { | ||
| continue | ||
| } | ||
| v := reflect.ValueOf(p) | ||
| r[v.Type()] = v | ||
| } | ||
| return r | ||
| } | ||
|
|
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| func fillValue(v reflect.Value, r rules) { | ||
| for v.Kind() == reflect.Pointer { | ||
| if v.IsNil() { | ||
| if ok, def := lookup(v.Type(), r); ok { | ||
| v.Set(def) | ||
| } else { | ||
| return | ||
| } | ||
| } | ||
| v = v.Elem() | ||
| } | ||
|
|
||
| switch v.Kind() { | ||
| case reflect.Struct: | ||
| t := v.Type() | ||
| for i := 0; i < v.NumField(); i++ { | ||
| sf := t.Field(i) | ||
| if sf.PkgPath != "" { // not exported | ||
| continue | ||
| } | ||
| fv := v.Field(i) | ||
|
|
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| setIfZero(fv, r) | ||
|
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| switch fv.Kind() { | ||
| case reflect.Pointer, reflect.Struct, reflect.Slice, reflect.Map, reflect.Interface: | ||
| fillValue(fv, r) | ||
| } | ||
| } | ||
|
|
||
| case reflect.Slice: | ||
| for i := 0; i < v.Len(); i++ { | ||
| fillValue(v.Index(i), r) | ||
| } | ||
|
|
||
| case reflect.Map: | ||
| iter := v.MapRange() | ||
| for iter.Next() { | ||
| k, val := iter.Key(), iter.Value() | ||
|
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| elem := reflect.New(v.Type().Elem()).Elem() | ||
| elem.Set(val) | ||
|
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| setIfZero(elem, r) | ||
|
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| switch elem.Kind() { | ||
| case reflect.Pointer, reflect.Struct, reflect.Slice, reflect.Map, reflect.Interface: | ||
| fillValue(elem, r) | ||
| } | ||
| v.SetMapIndex(k, elem) | ||
| } | ||
|
|
||
| case reflect.Interface: | ||
| if !v.IsNil() { | ||
| cur := v.Elem() | ||
| tmp := reflect.New(cur.Type()).Elem() | ||
| tmp.Set(cur) | ||
| fillValue(tmp, r) | ||
| v.Set(tmp) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func setIfZero(fv reflect.Value, r rules) { | ||
| need := false | ||
| switch fv.Kind() { | ||
| case reflect.Pointer, reflect.Map, reflect.Slice, reflect.Interface: | ||
| need = fv.IsNil() | ||
| default: | ||
| need = fv.IsZero() | ||
| } | ||
| if !need { | ||
| return | ||
| } | ||
| if ok, def := lookup(fv.Type(), r); ok { | ||
| fv.Set(def) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| func lookup(t reflect.Type, r rules) (bool, reflect.Value) { | ||
| if dv, ok := r[t]; ok { | ||
| if dv.Type().AssignableTo(t) { | ||
| return true, dv | ||
| } | ||
| if dv.Type().ConvertibleTo(t) { | ||
| return true, dv.Convert(t) | ||
| } | ||
| } | ||
|
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| if t.Kind() == reflect.Pointer { | ||
| elem := t.Elem() | ||
| if dv, ok := r[elem]; ok { | ||
| ptr := reflect.New(elem) | ||
| if dv.Type().AssignableTo(elem) { | ||
| ptr.Elem().Set(dv) | ||
| return true, ptr | ||
| } | ||
| if dv.Type().ConvertibleTo(elem) { | ||
| ptr.Elem().Set(dv.Convert(elem)) | ||
| return true, ptr | ||
| } | ||
| } | ||
| } | ||
|
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||
| if t.Kind() != reflect.Interface { | ||
| if dv, ok := r[reflect.PointerTo(t)]; ok && dv.Kind() == reflect.Pointer && !dv.IsNil() && dv.Type().Elem().AssignableTo(t) { | ||
| return true, dv.Elem() | ||
| } | ||
| } | ||
| return false, reflect.Value{} | ||
| } |
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