// prettyPrintFirstValue returns a string representation of the first decodable
// value in the provided byte slice, along with the remaining byte slice
// after decoding.
func prettyPrintFirstValue(b []byte) ([]byte, string, error) {
var err error
switch PeekType(b) {
case Null:
b, _ = DecodeIfNull(b)
return b, "NULL", nil
case NotNull:
b, _ = DecodeIfNotNull(b)
return b, "#", nil
case Int:
var i int64
b, i, err = DecodeVarintAscending(b)
if err != nil {
return b, "", err
}
return b, strconv.FormatInt(i, 10), nil
case Float:
// Handle float specific values separately.
switch b[0] {
case floatNaN, floatNaNDesc:
return b[1:], strconv.FormatFloat(math.NaN(), 'e', -1, 64), nil
case floatInfinity:
return b[1:], strconv.FormatFloat(math.Inf(1), 'e', -1, 64), nil
case floatNegativeInfinity:
return b[1:], strconv.FormatFloat(math.Inf(-1), 'e', -1, 64), nil
}
// Decode both floats and decimals as decimals to avoid
// overflow.
var d decimal.Decimal
b, d, err = DecodeDecimalAscending(b, nil)
if err != nil {
return b, "", err
}
return b, d.String(), nil
case Bytes:
var s string
b, s, err = DecodeStringAscending(b, nil)
if err != nil {
return b, "", err
}
return b, strconv.Quote(s), nil
case BytesDesc:
var s string
b, s, err = DecodeStringDescending(b, nil)
if err != nil {
return b, "", err
}
return b, strconv.Quote(s), nil
case Time:
var t time.Time
b, t, err = DecodeTimeAscending(b)
if err != nil {
return b, "", err
}
return b, t.UTC().Format(time.UnixDate), nil
case TimeDesc:
var t time.Time
b, t, err = DecodeTimeDescending(b)
if err != nil {
return b, "", err
}
return b, t.UTC().Format(time.UnixDate), nil
default:
// This shouldn't ever happen, but if it does, return an empty slice.
return nil, strconv.Quote(string(b)), nil
}
}
