// Copyright 2020 Jebbs. All rights reserved.
|
// Use of this source code is governed by MIT
|
// license that can be found in the LICENSE file.
|
|
package merge
|
|
const (
|
priorityKey string = "_priority"
|
tagKey string = "_tag"
|
)
|
|
// ApplyRules applies merge rules according to _tag, _priority fields, and remove them
|
func ApplyRules(m map[string]interface{}) error {
|
err := sortMergeSlices(m)
|
if err != nil {
|
return err
|
}
|
removeHelperFields(m)
|
return nil
|
}
|
|
// sortMergeSlices enumerates all slices in a map, to sort by priority and merge by tag
|
func sortMergeSlices(target map[string]interface{}) error {
|
for key, value := range target {
|
if slice, ok := value.([]interface{}); ok {
|
sortByPriority(slice)
|
s, err := mergeSameTag(slice)
|
if err != nil {
|
return err
|
}
|
target[key] = s
|
for _, item := range s {
|
if m, ok := item.(map[string]interface{}); ok {
|
sortMergeSlices(m)
|
}
|
}
|
} else if field, ok := value.(map[string]interface{}); ok {
|
sortMergeSlices(field)
|
}
|
}
|
return nil
|
}
|
|
func removeHelperFields(target map[string]interface{}) {
|
for key, value := range target {
|
if key == priorityKey || key == tagKey {
|
delete(target, key)
|
} else if slice, ok := value.([]interface{}); ok {
|
for _, e := range slice {
|
if el, ok := e.(map[string]interface{}); ok {
|
removeHelperFields(el)
|
}
|
}
|
} else if field, ok := value.(map[string]interface{}); ok {
|
removeHelperFields(field)
|
}
|
}
|
}
|
