// Copyright 2020 Jebbs. All rights reserved.
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// Use of this source code is governed by MIT
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// license that can be found in the LICENSE file.
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/*
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Package merge provides the capability to merge multiple
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JSON files or contents into one output.
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Merge Rules:
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- Simple values (string, number, boolean) are overwritten, others are merged
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- Elements with same "tag" (or "_tag") in an array will be merged
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- Add "_priority" property to array elements will help sort the
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*/
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package merge
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import (
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"bytes"
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"encoding/json"
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"github.com/v2fly/v2ray-core/v5/infra/conf/serial"
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)
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// JSONs merges multiple json contents into one json.
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func JSONs(args [][]byte) ([]byte, error) {
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m := make(map[string]interface{})
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for _, arg := range args {
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if _, err := ToMap(arg, m); err != nil {
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return nil, err
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}
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}
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return FromMap(m)
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}
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// ToMap merges json content to target map and returns it
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func ToMap(content []byte, target map[string]interface{}) (map[string]interface{}, error) {
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if target == nil {
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target = make(map[string]interface{})
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}
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r := bytes.NewReader(content)
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n := make(map[string]interface{})
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err := serial.DecodeJSON(r, &n)
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if err != nil {
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return nil, err
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}
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if err = mergeMaps(target, n); err != nil {
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return nil, err
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}
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return target, nil
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}
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// FromMap apply merge rules to map and convert it to json
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func FromMap(target map[string]interface{}) ([]byte, error) {
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if target == nil {
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target = make(map[string]interface{})
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}
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err := ApplyRules(target)
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if err != nil {
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return nil, err
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}
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return json.Marshal(target)
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}
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