EncodeFloat encodes a float value as per the stdlib encoder for json and xml protocol This encodes a float value into dst while attempting to conform to ES6 ToString for Numbers Based on encoding/json floatEncoder from the Go Standard Library https://golang.org/src/encoding/json/encode.go
(dst []byte, v float64, bits int)
| 12 | // Based on encoding/json floatEncoder from the Go Standard Library |
| 13 | // https://golang.org/src/encoding/json/encode.go |
| 14 | func EncodeFloat(dst []byte, v float64, bits int) []byte { |
| 15 | if math.IsInf(v, 0) || math.IsNaN(v) { |
| 16 | panic(fmt.Sprintf("invalid float value: %s", strconv.FormatFloat(v, 'g', -1, bits))) |
| 17 | } |
| 18 | |
| 19 | abs := math.Abs(v) |
| 20 | fmt := byte('f') |
| 21 | |
| 22 | if abs != 0 { |
| 23 | if bits == 64 && (abs < 1e-6 || abs >= 1e21) || bits == 32 && (float32(abs) < 1e-6 || float32(abs) >= 1e21) { |
| 24 | fmt = 'e' |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | dst = strconv.AppendFloat(dst, v, fmt, -1, bits) |
| 29 | |
| 30 | if fmt == 'e' { |
| 31 | // clean up e-09 to e-9 |
| 32 | n := len(dst) |
| 33 | if n >= 4 && dst[n-4] == 'e' && dst[n-3] == '-' && dst[n-2] == '0' { |
| 34 | dst[n-2] = dst[n-1] |
| 35 | dst = dst[:n-1] |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | return dst |
| 40 | } |