113 lines
1.7 KiB
Go
113 lines
1.7 KiB
Go
package jsn
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"io"
|
|
)
|
|
|
|
// Clear function wipes all scalar values from the json including those directly in an array
|
|
func Clear(w *bytes.Buffer, v []byte) error {
|
|
dec := json.NewDecoder(bytes.NewReader(v))
|
|
|
|
st := newIntStack()
|
|
isValue := false
|
|
inArray := false
|
|
n := 0
|
|
|
|
for {
|
|
var t json.Token
|
|
var err error
|
|
|
|
if t, err = dec.Token(); err == io.EOF {
|
|
break
|
|
} else if err != nil {
|
|
return err
|
|
}
|
|
|
|
switch v1 := t.(type) {
|
|
case int:
|
|
if isValue && !inArray {
|
|
w.WriteByte('0')
|
|
isValue = false
|
|
n++
|
|
}
|
|
|
|
case float64:
|
|
if isValue && !inArray {
|
|
w.WriteString(`0.0`)
|
|
isValue = false
|
|
n++
|
|
}
|
|
|
|
case bool:
|
|
if isValue && !inArray {
|
|
w.WriteString(`false`)
|
|
isValue = false
|
|
n++
|
|
}
|
|
|
|
case json.Number:
|
|
if isValue && !inArray {
|
|
w.WriteString(`0`)
|
|
isValue = false
|
|
n++
|
|
}
|
|
|
|
case nil:
|
|
if isValue && !inArray {
|
|
w.WriteString(`null`)
|
|
isValue = false
|
|
n++
|
|
}
|
|
|
|
case string:
|
|
if !isValue {
|
|
if n != 0 {
|
|
w.WriteByte(',')
|
|
}
|
|
|
|
io := int(dec.InputOffset())
|
|
w.Write(v[io-len(v1)-2 : io])
|
|
w.WriteString(`:`)
|
|
isValue = true
|
|
|
|
} else if !inArray {
|
|
w.WriteString(`""`)
|
|
isValue = false
|
|
n++
|
|
}
|
|
|
|
case json.Delim:
|
|
switch t.(json.Delim) {
|
|
case '[':
|
|
st.Push(n)
|
|
inArray = true
|
|
n = 0
|
|
case ']':
|
|
n = st.Pop()
|
|
inArray = false
|
|
isValue = false
|
|
n++
|
|
case '{':
|
|
if n != 0 && !isValue {
|
|
w.WriteByte(',')
|
|
}
|
|
st.Push(n)
|
|
inArray = false
|
|
isValue = false
|
|
n = 0
|
|
case '}':
|
|
n = st.Pop()
|
|
isValue = false
|
|
n++
|
|
}
|
|
w.WriteByte(v[dec.InputOffset()-1])
|
|
}
|
|
|
|
dec.More()
|
|
}
|
|
|
|
return nil
|
|
}
|