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yaml.go
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yaml.go
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package openapi31
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"gopkg.in/yaml.v2"
)
// UnmarshalYAML reads from YAML bytes.
func (s *Spec) UnmarshalYAML(data []byte) error {
var v interface{}
err := yaml.Unmarshal(data, &v)
if err != nil {
return err
}
v = convertMapI2MapS(v)
data, err = json.Marshal(v)
if err != nil {
return err
}
return s.UnmarshalJSON(data)
}
// MarshalYAML produces YAML bytes.
func (s *Spec) MarshalYAML() ([]byte, error) {
jsonData, err := s.MarshalJSON()
if err != nil {
return nil, err
}
var v orderedMap
err = json.Unmarshal(jsonData, &v)
if err != nil {
return nil, err
}
return yaml.Marshal(yaml.MapSlice(v))
}
type orderedMap []yaml.MapItem
func (om *orderedMap) UnmarshalJSON(data []byte) error {
var mapData map[string]interface{}
err := json.Unmarshal(data, &mapData)
if err != nil {
return err
}
keys, err := objectKeys(data)
if err != nil {
return err
}
for _, key := range keys {
*om = append(*om, yaml.MapItem{
Key: key,
Value: mapData[key],
})
}
return nil
}
func objectKeys(b []byte) ([]string, error) {
d := json.NewDecoder(bytes.NewReader(b))
t, err := d.Token()
if err != nil {
return nil, err
}
if t != json.Delim('{') {
return nil, errors.New("expected start of object")
}
var keys []string
for {
t, err := d.Token()
if err != nil {
return nil, err
}
if t == json.Delim('}') {
return keys, nil
}
keys = append(keys, t.(string))
if err := skipValue(d); err != nil {
return nil, err
}
}
}
var errUnterminated = errors.New("unterminated array or object")
func skipValue(d *json.Decoder) error {
t, err := d.Token()
if err != nil {
return err
}
switch t {
case json.Delim('['), json.Delim('{'):
for {
if err := skipValue(d); err != nil {
if errors.Is(err, errUnterminated) {
break
}
return err
}
}
case json.Delim(']'), json.Delim('}'):
return errUnterminated
}
return nil
}
// convertMapI2MapS walks the given dynamic object recursively, and
// converts maps with interface{} key type to maps with string key type.
// This function comes handy if you want to marshal a dynamic object into
// JSON where maps with interface{} key type are not allowed.
//
// Recursion is implemented into values of the following types:
//
// -map[interface{}]interface{}
// -map[string]interface{}
// -[]interface{}
//
// When converting map[interface{}]interface{} to map[string]interface{},
// fmt.Sprint() with default formatting is used to convert the key to a string key.
//
// See github.com/icza/dyno.
func convertMapI2MapS(v interface{}) interface{} {
switch x := v.(type) {
case map[interface{}]interface{}:
m := map[string]interface{}{}
for k, v2 := range x {
switch k2 := k.(type) {
case string: // Fast check if it's already a string
m[k2] = convertMapI2MapS(v2)
default:
m[fmt.Sprint(k)] = convertMapI2MapS(v2)
}
}
v = m
case []interface{}:
for i, v2 := range x {
x[i] = convertMapI2MapS(v2)
}
case map[string]interface{}:
for k, v2 := range x {
x[k] = convertMapI2MapS(v2)
}
}
return v
}