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package utils
import (
"reflect"
"github.com/pkg/errors"
)
// MustMergeTags is same as MergeTags but panics if there is an error.
func MustMergeTags(obj interface{}, tags []string) {
err := MergeTags(obj, tags)
if err != nil {
panic(err)
}
}
// MergeTags merges Tags in the object with tags.
func MergeTags(obj interface{}, tags []string) error {
if len(tags) == 0 {
return nil
}
ptr := reflect.ValueOf(obj)
if ptr.Kind() != reflect.Ptr {
return errors.New("obj is not a pointer")
}
v := reflect.Indirect(ptr)
structTags := v.FieldByName("Tags")
var zero reflect.Value
if structTags == zero {
return nil
}
m := make(map[string]bool)
for i := 0; i < structTags.Len(); i++ {
tag := reflect.Indirect(structTags.Index(i)).String()
m[tag] = true
}
for _, tag := range tags {
if _, ok := m[tag]; !ok {
t := tag
structTags.Set(reflect.Append(structTags, reflect.ValueOf(&t)))
}
}
return nil
}
// MustRemoveTags is same as RemoveTags but panics if there is an error.
func MustRemoveTags(obj interface{}, tags []string) {
err := RemoveTags(obj, tags)
if err != nil {
panic(err)
}
}
// RemoveTags removes tags from the Tags in obj.
func RemoveTags(obj interface{}, tags []string) error {
if len(tags) == 0 {
return nil
}
m := make(map[string]bool)
for _, tag := range tags {
m[tag] = true
}
ptr := reflect.ValueOf(obj)
if ptr.Kind() != reflect.Ptr {
return errors.New("obj is not a pointer")
}
v := reflect.Indirect(ptr)
structTags := v.FieldByName("Tags")
var zero reflect.Value
if structTags == zero {
return nil
}
res := reflect.MakeSlice(reflect.SliceOf(reflect.PtrTo(reflect.TypeOf(""))), 0, 0)
for i := 0; i < structTags.Len(); i++ {
tag := reflect.Indirect(structTags.Index(i)).String()
if !m[tag] {
res = reflect.Append(res, structTags.Index(i))
}
}
structTags.Set(res)
return nil
}
|
