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util.go
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util.go
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package rel
import (
"fmt"
"math"
"reflect"
"strconv"
"strings"
)
func indirectInterface(rv reflect.Value) any {
if rv.Kind() == reflect.Ptr {
if rv.IsNil() {
return nil
}
rv = rv.Elem()
}
return rv.Interface()
}
func indirectReflectType(rt reflect.Type) reflect.Type {
if rt.Kind() == reflect.Ptr {
return rt.Elem()
}
return rt
}
func must(err error) {
if err != nil {
panic(err)
}
}
func mustTrue(flag bool, msg string) {
if !flag {
panic(msg)
}
}
type isZeroer interface {
IsZero() bool
}
// isZero shallowly check wether a field in struct is zero or not
func isZero(value any) bool {
var (
zero bool
)
switch v := value.(type) {
case nil:
zero = true
case bool:
zero = !v
case string:
zero = v == ""
case int:
zero = v == 0
case int8:
zero = v == 0
case int16:
zero = v == 0
case int32:
zero = v == 0
case int64:
zero = v == 0
case uint:
zero = v == 0
case uint8:
zero = v == 0
case uint16:
zero = v == 0
case uint32:
zero = v == 0
case uint64:
zero = v == 0
case uintptr:
zero = v == 0
case float32:
zero = v == 0
case float64:
zero = v == 0
case isZeroer:
zero = v.IsZero()
default:
zero = isDeepZero(reflect.ValueOf(value), 0)
}
return zero
}
// modified from https://golang.org/src/reflect/value.go?s=33807:33835#L1077
func isDeepZero(rv reflect.Value, depth int) bool {
if depth < 0 {
return true
}
switch rv.Kind() {
case reflect.Bool:
return !rv.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return rv.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return rv.Uint() == 0
case reflect.Float32, reflect.Float64:
return math.Float64bits(rv.Float()) == 0
case reflect.Complex64, reflect.Complex128:
c := rv.Complex()
return math.Float64bits(real(c)) == 0 && math.Float64bits(imag(c)) == 0
case reflect.Array:
// check one level deeper if it's an uuid ([16]byte)
if rv.Type().Elem().Kind() == reflect.Uint8 && rv.Len() == 16 {
depth += 1
}
for i := 0; i < rv.Len(); i++ {
if !isDeepZero(rv.Index(i), depth-1) {
return false
}
}
return true
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.UnsafePointer:
return rv.IsNil()
case reflect.Slice:
return rv.IsNil() || rv.Len() == 0
case reflect.String:
return rv.Len() == 0
case reflect.Struct:
for i := 0; i < rv.NumField(); i++ {
if !isDeepZero(rv.Field(i), depth-1) {
return false
}
}
return true
default:
return true
}
}
func setPointerValue(ft reflect.Type, fv reflect.Value, rt reflect.Type, rv reflect.Value) bool {
if ft.Elem() != rt && !rt.AssignableTo(ft.Elem()) {
return false
}
if fv.IsNil() {
fv.Set(reflect.New(ft.Elem()))
}
fv.Elem().Set(rv)
return true
}
func setConvertValue(ft reflect.Type, fv reflect.Value, rt reflect.Type, rv reflect.Value) bool {
var (
rk = rt.Kind()
fk = ft.Kind()
)
// prevents unintentional conversion
if (rk >= reflect.Int || rk <= reflect.Uint64) && fk == reflect.String {
return false
}
fv.Set(rv.Convert(ft))
return true
}
func fmtAny(v any) string {
if str, ok := v.(string); ok {
return "\"" + str + "\""
}
return fmt.Sprint(v)
}
func fmtAnys(v []any) string {
var str strings.Builder
for i := range v {
if i > 0 {
str.WriteString(", ")
}
str.WriteString(fmtAny(v[i]))
}
return str.String()
}
// Encode index slice into single string
func encodeIndices(indices []int) string {
var sb strings.Builder
for _, index := range indices {
sb.WriteString("/")
sb.WriteString(strconv.Itoa(index))
}
return sb.String()
}
// Get field by index and init pointers on path if flag is true
//
// modified from: https://cs.opensource.google/go/go/+/refs/tags/go1.17.7:src/reflect/value.go;l=1228-1245;bpv
func reflectValueFieldByIndex(rv reflect.Value, index []int, init bool) reflect.Value {
if len(index) == 1 {
return rv.Field(index[0])
}
for depth := 0; depth < len(index)-1; depth += 1 {
field := rv.Field(index[depth])
if field.Kind() != reflect.Ptr {
rv = field
continue
}
if field.IsNil() {
if !init {
targetType := field.Type().Elem().FieldByIndex(index[depth+1:]).Type
return reflect.Zero(reflect.PtrTo(targetType))
}
field.Set(reflect.New(field.Type().Elem()))
}
rv = field.Elem()
}
return rv.Field(index[len(index)-1])
}