/
json.go
112 lines (96 loc) · 1.76 KB
/
json.go
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package omap
import (
"bytes"
"encoding/json"
"fmt"
)
var endOfSlice = fmt.Errorf("End of slice")
func (m *omap) MarshalJSON() ([]byte, error) {
buf := bytes.NewBuffer([]byte{'{'})
for _, key := range m.keys {
// Marshal key
b, err := json.Marshal(key)
if err != nil {
return nil, err
}
buf.Write(b)
buf.WriteByte(':')
// Marshal value
b, err = json.Marshal(m.body[key])
if err != nil {
return nil, err
}
buf.Write(b)
buf.WriteByte(',')
}
b := buf.Bytes()
b[len(b)-1] = '}'
return b, nil
}
func (m *omap) UnmarshalJSON(b []byte) error {
dec := json.NewDecoder(bytes.NewReader(b))
dec.Token() // {
m.unmarshalJSON(dec)
dec.Token() // }
return nil
}
func (m *omap) unmarshalJSON(dec *json.Decoder) error {
for dec.More() {
t, err := dec.Token()
if err != nil {
return err
}
key, isKey := t.(string)
if !isKey {
return fmt.Errorf("%t %s is not string(expected key)", t, t)
}
val, err := getVal(dec)
if err != nil {
return err
}
m.Set(key, val)
}
return nil
}
func decToSlice(dec *json.Decoder) ([]any, error) {
res := make([]any, 0)
for {
v, err := getVal(dec)
if err == endOfSlice {
return res, nil
}
if err != nil {
return nil, err
}
res = append(res, v)
}
}
func getVal(dec *json.Decoder) (any, error) {
t, err := dec.Token()
if err != nil {
return nil, err
}
switch tok := t.(type) {
case json.Delim:
switch tok {
case '[':
return decToSlice(dec)
case '{':
om := New()
err := om.(*omap).unmarshalJSON(dec)
if err != nil {
return nil, err
}
_, err = dec.Token() // }
return om, err
case ']':
return nil, endOfSlice
case '}':
return nil, fmt.Errorf("unexpected '}'")
default:
panic("unreachable code")
}
default:
return tok, nil
}
}