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|
package nested
import (
"errors"
"strings"
)
var (
ErrNoSuchKey = errors.New("no such key")
ErrUnmatchedType = errors.New("unmatched type")
)
type Nested map[string]interface{}
func (n Nested) GetString(keys []string) (value string, err error) {
v, err := n.Get(keys)
if err != nil {
return "", err
}
value, ok := v.(string)
if !ok {
return "", ErrUnmatchedType
}
return value, nil
}
func (n Nested) GetInt(keys []string) (value int, err error) {
v, err := n.Get(keys)
if err != nil {
return 0, err
}
value, ok := v.(int)
if !ok {
return 0, ErrUnmatchedType
}
return value, nil
}
func (n Nested) GetBool(keys []string) (value bool, err error) {
v, err := n.Get(keys)
if err != nil {
return false, err
}
value, ok := v.(bool)
if !ok {
return false, ErrUnmatchedType
}
return value, nil
}
func (n Nested) GetByString(key, sep string) (value interface{}, err error) {
key = strings.TrimPrefix(key, sep)
return n.Get(strings.Split(key, sep))
}
func (n Nested) Get(keys []string) (value interface{}, err error) {
var ok bool
m := n
for i, k := range keys {
value, ok = m[k]
if !ok {
return nil, ErrNoSuchKey
}
if i == len(keys)-1 {
break
}
m, ok = value.(map[string]interface{})
if !ok {
return nil, ErrNoSuchKey
}
}
return value, nil
}
func (n Nested) SetByString(key, sep string, value interface{}) {
key = strings.TrimPrefix(key, sep)
n.Set(strings.Split(key, sep), value)
}
func (n Nested) Set(keys []string, value interface{}) {
m := n
for i, k := range keys {
if i == len(keys)-1 {
m[k] = value
return
}
v, ok := m[k]
if ok {
temp, ok := v.(map[string]interface{})
if ok {
m = temp
continue
}
}
newMap := map[string]interface{}{}
m[k] = newMap
m = newMap
}
return
}
func (n Nested) DeleteByString(key, sep string) error {
key = strings.TrimPrefix(key, sep)
return n.Delete(strings.Split(key, sep))
}
func (n Nested) Delete(keys []string) error {
m := n
for i, k := range keys {
value, ok := m[k]
if !ok {
return ErrNoSuchKey
}
if i == len(keys)-1 {
delete(m, k)
return nil
}
m, ok = value.(map[string]interface{})
if !ok {
return ErrNoSuchKey
}
}
return nil
}
var SkipKey = errors.New("skip this key")
type WalkFunc func(keys []string, value interface{}) error
func (n Nested) Walk(walkFn WalkFunc) error {
for k, v := range n {
err := walk([]string{k}, v, walkFn)
if err == SkipKey {
continue
} else if err != nil {
return err
}
}
return nil
}
func walk(keys []string, value interface{}, walkFn WalkFunc) error {
err := walkFn(keys, value)
if err == SkipKey {
return nil
} else if err != nil {
return err
}
m, ok := value.(map[string]interface{})
if !ok {
return nil
}
for k, v := range m {
err = walk(append(keys, k), v, walkFn)
if err != nil {
return err
}
}
return nil
}
|
