/
json.go
214 lines (181 loc) · 4.25 KB
/
json.go
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// Copyright (c) 2017 AnUnnamedProject
// Distributed under the MIT software license, see the accompanying
// file LICENSE or http://www.opensource.org/licenses/mit-license.php.
package framework
import "encoding/json"
// Unmarshal unstructured JSON
//
//
// Example using the following JSON string
// {
// "str": "FirstString",
// "int": 120,
// "bool": true,
// "array": ["5", "10"],
// "object": {
// "str": "SecondString",
// "int": 121,
// "bool": false,
// "array": ["15", "20"],
// "object": {
// "str": "ThirdString",
// "int": 122,
// "bool": true,
// "array": ["25", "30"]
// }
// }
// }
//
// j, _ := PrepareJSON([]byte(`{ "str": "FirstString", "int": 120, "bool": true, "array": ["5", "10"], "object": { "str": "SecondString", "int": 121, "bool": false, "array": ["15", "20"], "object": { "str": "ThirdString", "int": 122, "bool": true, "array": ["25", "30"] } } }`))
// fmt.Printf("%v\n", j.Get("object", "str"))
//
// Expected output: SecondString
type (
// JSON contains a generic map for output.
JSON map[string]interface{}
// JSONValue contains values from JSONData.
JSONValue struct {
data interface{}
}
// JSONData contains the array map to values.
JSONData struct {
JSONValue
m map[string]*JSONValue
}
)
// String returns the value as string.
func (v *JSONValue) String() string {
if v == nil {
return ""
}
if _, ok := v.data.(string); ok {
return v.data.(string)
}
return ""
}
// Bool returns the value as string.
func (v *JSONValue) Bool() bool {
if v == nil {
return false
}
if _, ok := v.data.(bool); ok {
return v.data.(bool)
}
return false
}
// Float64 returns the value as float64.
func (v *JSONValue) Float64() float64 {
if v == nil {
return 0
}
if _, ok := v.data.(float64); ok {
return v.data.(float64)
}
return 0
}
// Int32 converts and returns the value as int32.
func (v *JSONValue) Int32() int32 {
if v == nil {
return 0
}
if _, ok := v.data.(float64); ok {
return int32(v.data.(float64))
}
return 0
}
// Int64 converts and returns the value as int64.
func (v *JSONValue) Int64() int64 {
if v == nil {
return 0
}
if _, ok := v.data.(float64); ok {
return int64(v.data.(float64))
}
return 0
}
// Array returns the values as an array.
func (v *JSONValue) Array() []interface{} {
if v == nil {
return nil
}
if _, ok := v.data.([]interface{}); ok {
return v.data.([]interface{})
}
return nil
}
// Map returns the values as a map[string]interface{}.
func (v *JSONValue) Map() map[string]interface{} {
if v == nil {
return nil
}
if _, ok := v.data.(map[string]interface{}); ok {
return v.data.(map[string]interface{})
}
return nil
}
// Get a value using the specified keys, returns nil if value is not found.
func (d *JSONData) Get(keys ...string) *JSONValue {
cv := d
for _, k := range keys {
// Key does not exists
if cv.m[k] == nil {
continue
}
switch cv.m[k].data.(type) {
case *JSONData:
cv = cv.m[k].data.(*JSONData)
case bool:
return &JSONValue{data: cv.m[k].data}
case float64:
return &JSONValue{data: cv.m[k].data}
case string:
return &JSONValue{data: cv.m[k].data}
case []interface{}:
return &JSONValue{data: cv.m[k].data}
default:
return nil
}
}
return nil
}
// Set a key with specified value.
func (d *JSONData) Set(key string, value interface{}) {
d.m[key] = &JSONValue{
data: value,
}
}
// PrepareJSON instantiate the JSONData and unmarshal the data json, returns a JSONData struct.
func PrepareJSON(data []byte) (*JSONData, error) {
var j = &JSONData{
m: make(map[string]*JSONValue),
}
err := json.Unmarshal(data, &j.data)
if err != nil {
return nil, err
}
for k, v := range j.data.(map[string]interface{}) {
switch v.(type) {
case map[string]interface{}:
j.m[k] = j.PrepareInterface(v)
default:
j.m[k] = &JSONValue{data: v}
}
}
return j, nil
}
// PrepareInterface is a recursive function to translate json objects to maps.
func (d *JSONData) PrepareInterface(data interface{}) *JSONValue {
out := &JSONData{
m: make(map[string]*JSONValue),
}
out.data = data
for mk, mv := range data.(map[string]interface{}) {
switch mv.(type) {
case map[string]interface{}:
out.m[mk] = d.PrepareInterface(mv)
default:
out.m[mk] = &JSONValue{data: mv}
}
}
return &JSONValue{data: out}
}