447 lines
9.9 KiB
Go
447 lines
9.9 KiB
Go
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package simplejson
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import (
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"encoding/json"
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"errors"
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"log"
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)
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// returns the current implementation version
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func Version() string {
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return "0.5.0"
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}
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type Json struct {
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data interface{}
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}
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// NewJson returns a pointer to a new `Json` object
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// after unmarshaling `body` bytes
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func NewJson(body []byte) (*Json, error) {
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j := new(Json)
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err := j.UnmarshalJSON(body)
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if err != nil {
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return nil, err
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}
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return j, nil
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}
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// New returns a pointer to a new, empty `Json` object
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func New() *Json {
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return &Json{
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data: make(map[string]interface{}),
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}
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}
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// Interface returns the underlying data
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func (j *Json) Interface() interface{} {
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return j.data
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}
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// Encode returns its marshaled data as `[]byte`
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func (j *Json) Encode() ([]byte, error) {
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return j.MarshalJSON()
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}
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// EncodePretty returns its marshaled data as `[]byte` with indentation
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func (j *Json) EncodePretty() ([]byte, error) {
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return json.MarshalIndent(&j.data, "", " ")
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}
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// Implements the json.Marshaler interface.
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func (j *Json) MarshalJSON() ([]byte, error) {
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return json.Marshal(&j.data)
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}
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// Set modifies `Json` map by `key` and `value`
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// Useful for changing single key/value in a `Json` object easily.
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func (j *Json) Set(key string, val interface{}) {
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m, err := j.Map()
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if err != nil {
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return
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}
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m[key] = val
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}
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// SetPath modifies `Json`, recursively checking/creating map keys for the supplied path,
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// and then finally writing in the value
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func (j *Json) SetPath(branch []string, val interface{}) {
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if len(branch) == 0 {
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j.data = val
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return
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}
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// in order to insert our branch, we need map[string]interface{}
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if _, ok := (j.data).(map[string]interface{}); !ok {
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// have to replace with something suitable
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j.data = make(map[string]interface{})
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}
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curr := j.data.(map[string]interface{})
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for i := 0; i < len(branch)-1; i++ {
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b := branch[i]
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// key exists?
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if _, ok := curr[b]; !ok {
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n := make(map[string]interface{})
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curr[b] = n
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curr = n
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continue
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}
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// make sure the value is the right sort of thing
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if _, ok := curr[b].(map[string]interface{}); !ok {
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// have to replace with something suitable
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n := make(map[string]interface{})
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curr[b] = n
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}
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curr = curr[b].(map[string]interface{})
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}
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// add remaining k/v
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curr[branch[len(branch)-1]] = val
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}
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// Del modifies `Json` map by deleting `key` if it is present.
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func (j *Json) Del(key string) {
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m, err := j.Map()
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if err != nil {
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return
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}
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delete(m, key)
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}
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// Get returns a pointer to a new `Json` object
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// for `key` in its `map` representation
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//
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// useful for chaining operations (to traverse a nested JSON):
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// js.Get("top_level").Get("dict").Get("value").Int()
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func (j *Json) Get(key string) *Json {
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m, err := j.Map()
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if err == nil {
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if val, ok := m[key]; ok {
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return &Json{val}
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}
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}
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return &Json{nil}
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}
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// GetPath searches for the item as specified by the branch
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// without the need to deep dive using Get()'s.
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//
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// js.GetPath("top_level", "dict")
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func (j *Json) GetPath(branch ...string) *Json {
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jin := j
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for _, p := range branch {
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jin = jin.Get(p)
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}
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return jin
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}
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// GetIndex returns a pointer to a new `Json` object
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// for `index` in its `array` representation
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//
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// this is the analog to Get when accessing elements of
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// a json array instead of a json object:
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// js.Get("top_level").Get("array").GetIndex(1).Get("key").Int()
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func (j *Json) GetIndex(index int) *Json {
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a, err := j.Array()
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if err == nil {
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if len(a) > index {
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return &Json{a[index]}
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}
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}
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return &Json{nil}
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}
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// CheckGet returns a pointer to a new `Json` object and
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// a `bool` identifying success or failure
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//
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// useful for chained operations when success is important:
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// if data, ok := js.Get("top_level").CheckGet("inner"); ok {
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// log.Println(data)
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// }
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func (j *Json) CheckGet(key string) (*Json, bool) {
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m, err := j.Map()
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if err == nil {
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if val, ok := m[key]; ok {
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return &Json{val}, true
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}
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}
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return nil, false
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}
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// Map type asserts to `map`
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func (j *Json) Map() (map[string]interface{}, error) {
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if m, ok := (j.data).(map[string]interface{}); ok {
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return m, nil
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}
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return nil, errors.New("type assertion to map[string]interface{} failed")
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}
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// Array type asserts to an `array`
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func (j *Json) Array() ([]interface{}, error) {
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if a, ok := (j.data).([]interface{}); ok {
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return a, nil
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}
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return nil, errors.New("type assertion to []interface{} failed")
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}
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// Bool type asserts to `bool`
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func (j *Json) Bool() (bool, error) {
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if s, ok := (j.data).(bool); ok {
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return s, nil
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}
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return false, errors.New("type assertion to bool failed")
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}
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// String type asserts to `string`
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func (j *Json) String() (string, error) {
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if s, ok := (j.data).(string); ok {
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return s, nil
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}
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return "", errors.New("type assertion to string failed")
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}
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// Bytes type asserts to `[]byte`
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func (j *Json) Bytes() ([]byte, error) {
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if s, ok := (j.data).(string); ok {
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return []byte(s), nil
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}
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return nil, errors.New("type assertion to []byte failed")
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}
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// StringArray type asserts to an `array` of `string`
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func (j *Json) StringArray() ([]string, error) {
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arr, err := j.Array()
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if err != nil {
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return nil, err
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}
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retArr := make([]string, 0, len(arr))
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for _, a := range arr {
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if a == nil {
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retArr = append(retArr, "")
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continue
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}
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s, ok := a.(string)
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if !ok {
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return nil, err
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}
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retArr = append(retArr, s)
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}
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return retArr, nil
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}
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// MustArray guarantees the return of a `[]interface{}` (with optional default)
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//
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// useful when you want to interate over array values in a succinct manner:
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// for i, v := range js.Get("results").MustArray() {
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// fmt.Println(i, v)
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// }
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func (j *Json) MustArray(args ...[]interface{}) []interface{} {
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var def []interface{}
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switch len(args) {
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case 0:
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case 1:
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def = args[0]
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default:
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log.Panicf("MustArray() received too many arguments %d", len(args))
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}
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a, err := j.Array()
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if err == nil {
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return a
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}
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return def
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}
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// MustMap guarantees the return of a `map[string]interface{}` (with optional default)
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//
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// useful when you want to interate over map values in a succinct manner:
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// for k, v := range js.Get("dictionary").MustMap() {
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// fmt.Println(k, v)
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// }
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func (j *Json) MustMap(args ...map[string]interface{}) map[string]interface{} {
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var def map[string]interface{}
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switch len(args) {
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case 0:
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case 1:
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def = args[0]
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default:
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log.Panicf("MustMap() received too many arguments %d", len(args))
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}
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a, err := j.Map()
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if err == nil {
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return a
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}
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return def
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}
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// MustString guarantees the return of a `string` (with optional default)
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//
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// useful when you explicitly want a `string` in a single value return context:
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// myFunc(js.Get("param1").MustString(), js.Get("optional_param").MustString("my_default"))
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func (j *Json) MustString(args ...string) string {
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var def string
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switch len(args) {
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case 0:
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case 1:
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def = args[0]
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default:
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log.Panicf("MustString() received too many arguments %d", len(args))
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}
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s, err := j.String()
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if err == nil {
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return s
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}
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return def
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}
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// MustStringArray guarantees the return of a `[]string` (with optional default)
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//
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// useful when you want to interate over array values in a succinct manner:
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// for i, s := range js.Get("results").MustStringArray() {
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// fmt.Println(i, s)
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// }
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func (j *Json) MustStringArray(args ...[]string) []string {
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var def []string
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switch len(args) {
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case 0:
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case 1:
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def = args[0]
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default:
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log.Panicf("MustStringArray() received too many arguments %d", len(args))
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}
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a, err := j.StringArray()
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if err == nil {
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return a
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}
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return def
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}
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// MustInt guarantees the return of an `int` (with optional default)
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//
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// useful when you explicitly want an `int` in a single value return context:
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// myFunc(js.Get("param1").MustInt(), js.Get("optional_param").MustInt(5150))
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func (j *Json) MustInt(args ...int) int {
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var def int
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switch len(args) {
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case 0:
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case 1:
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def = args[0]
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default:
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log.Panicf("MustInt() received too many arguments %d", len(args))
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}
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i, err := j.Int()
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if err == nil {
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return i
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}
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return def
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}
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// MustFloat64 guarantees the return of a `float64` (with optional default)
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//
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// useful when you explicitly want a `float64` in a single value return context:
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// myFunc(js.Get("param1").MustFloat64(), js.Get("optional_param").MustFloat64(5.150))
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func (j *Json) MustFloat64(args ...float64) float64 {
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var def float64
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switch len(args) {
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case 0:
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case 1:
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def = args[0]
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default:
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log.Panicf("MustFloat64() received too many arguments %d", len(args))
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}
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f, err := j.Float64()
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if err == nil {
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return f
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}
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return def
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}
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// MustBool guarantees the return of a `bool` (with optional default)
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//
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// useful when you explicitly want a `bool` in a single value return context:
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// myFunc(js.Get("param1").MustBool(), js.Get("optional_param").MustBool(true))
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func (j *Json) MustBool(args ...bool) bool {
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var def bool
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switch len(args) {
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case 0:
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case 1:
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def = args[0]
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default:
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log.Panicf("MustBool() received too many arguments %d", len(args))
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}
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b, err := j.Bool()
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if err == nil {
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return b
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}
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return def
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}
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// MustInt64 guarantees the return of an `int64` (with optional default)
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//
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// useful when you explicitly want an `int64` in a single value return context:
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// myFunc(js.Get("param1").MustInt64(), js.Get("optional_param").MustInt64(5150))
|
||
|
|
func (j *Json) MustInt64(args ...int64) int64 {
|
||
|
|
var def int64
|
||
|
|
|
||
|
|
switch len(args) {
|
||
|
|
case 0:
|
||
|
|
case 1:
|
||
|
|
def = args[0]
|
||
|
|
default:
|
||
|
|
log.Panicf("MustInt64() received too many arguments %d", len(args))
|
||
|
|
}
|
||
|
|
|
||
|
|
i, err := j.Int64()
|
||
|
|
if err == nil {
|
||
|
|
return i
|
||
|
|
}
|
||
|
|
|
||
|
|
return def
|
||
|
|
}
|
||
|
|
|
||
|
|
// MustUInt64 guarantees the return of an `uint64` (with optional default)
|
||
|
|
//
|
||
|
|
// useful when you explicitly want an `uint64` in a single value return context:
|
||
|
|
// myFunc(js.Get("param1").MustUint64(), js.Get("optional_param").MustUint64(5150))
|
||
|
|
func (j *Json) MustUint64(args ...uint64) uint64 {
|
||
|
|
var def uint64
|
||
|
|
|
||
|
|
switch len(args) {
|
||
|
|
case 0:
|
||
|
|
case 1:
|
||
|
|
def = args[0]
|
||
|
|
default:
|
||
|
|
log.Panicf("MustUint64() received too many arguments %d", len(args))
|
||
|
|
}
|
||
|
|
|
||
|
|
i, err := j.Uint64()
|
||
|
|
if err == nil {
|
||
|
|
return i
|
||
|
|
}
|
||
|
|
|
||
|
|
return def
|
||
|
|
}
|