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array.go
60 lines (55 loc) · 1.03 KB
/
array.go
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package zson
import (
"encoding/json"
"errors"
"fmt"
)
type StringOrArray []string
func (s StringOrArray) MarshalJSON() ([]byte, error) {
if len(s) == 1 {
return json.Marshal(s[0])
}
arr := []string(s)
return json.Marshal(arr)
}
func (s *StringOrArray) UnmarshalJSON(b []byte) error {
var raw interface{}
if err := json.Unmarshal(b, &raw); err != nil {
return err
}
switch raw.(type) {
case nil:
*s = make([]string, 0)
case string:
out := make([]string, 1)
out[0] = raw.(string)
*s = out
case []interface{}:
arr := raw.([]interface{})
out := make([]string, len(arr))
for idx, elt := range arr {
switch t := elt.(type) {
case string:
out[idx] = elt.(string)
default:
return fmt.Errorf("Error: element %d of array is a %v, (expected string)", idx, t)
}
}
*s = out
default:
return errors.New("Not a string or an array")
}
return nil
}
func (s *StringOrArray) Empty() bool {
if s == nil {
return true
}
if *s == nil {
return true
}
if len(*s) == 0 {
return true
}
return false
}