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//go:build !go1.18
// +build !go1.18
package redis
import (
"errors"
"reflect"
)
// fieldByIndexErr returns the nested field corresponding to index.
// It returns an error if evaluation requires stepping through a nil
// pointer, but panics if it must step through a field that
// is not a struct.
func fieldByIndexErr(v reflect.Value, index []int) (reflect.Value, error) {
if len(index) == 1 {
return v.Field(index[0]), nil
}
mustBe(v, reflect.Struct)
for i, x := range index {
if i > 0 {
if v.Kind() == reflect.Ptr && v.Type().Elem().Kind() == reflect.Struct {
if v.IsNil() {
return reflect.Value{}, errors.New("reflect: indirection through nil pointer to embedded struct field " + v.Type().Elem().Name())
}
v = v.Elem()
}
}
v = v.Field(x)
}
return v, nil
}
|
