mirror of
https://github.com/crazy-max/diun.git
synced 2024-12-22 19:38:28 +00:00
112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
package jsoniter
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import (
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"fmt"
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"math"
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"strconv"
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)
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var pow10 []uint64
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func init() {
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pow10 = []uint64{1, 10, 100, 1000, 10000, 100000, 1000000}
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}
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// WriteFloat32 write float32 to stream
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func (stream *Stream) WriteFloat32(val float32) {
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if math.IsInf(float64(val), 0) || math.IsNaN(float64(val)) {
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stream.Error = fmt.Errorf("unsupported value: %f", val)
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return
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}
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abs := math.Abs(float64(val))
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fmt := byte('f')
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// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
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if abs != 0 {
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if float32(abs) < 1e-6 || float32(abs) >= 1e21 {
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fmt = 'e'
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}
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}
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stream.buf = strconv.AppendFloat(stream.buf, float64(val), fmt, -1, 32)
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}
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// WriteFloat32Lossy write float32 to stream with ONLY 6 digits precision although much much faster
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func (stream *Stream) WriteFloat32Lossy(val float32) {
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if math.IsInf(float64(val), 0) || math.IsNaN(float64(val)) {
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stream.Error = fmt.Errorf("unsupported value: %f", val)
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return
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}
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if val < 0 {
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stream.writeByte('-')
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val = -val
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}
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if val > 0x4ffffff {
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stream.WriteFloat32(val)
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return
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}
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precision := 6
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exp := uint64(1000000) // 6
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lval := uint64(float64(val)*float64(exp) + 0.5)
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stream.WriteUint64(lval / exp)
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fval := lval % exp
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if fval == 0 {
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return
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}
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stream.writeByte('.')
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for p := precision - 1; p > 0 && fval < pow10[p]; p-- {
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stream.writeByte('0')
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}
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stream.WriteUint64(fval)
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for stream.buf[len(stream.buf)-1] == '0' {
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stream.buf = stream.buf[:len(stream.buf)-1]
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}
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}
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// WriteFloat64 write float64 to stream
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func (stream *Stream) WriteFloat64(val float64) {
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if math.IsInf(val, 0) || math.IsNaN(val) {
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stream.Error = fmt.Errorf("unsupported value: %f", val)
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return
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}
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abs := math.Abs(val)
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fmt := byte('f')
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// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
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if abs != 0 {
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if abs < 1e-6 || abs >= 1e21 {
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fmt = 'e'
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}
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}
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stream.buf = strconv.AppendFloat(stream.buf, float64(val), fmt, -1, 64)
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}
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// WriteFloat64Lossy write float64 to stream with ONLY 6 digits precision although much much faster
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func (stream *Stream) WriteFloat64Lossy(val float64) {
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if math.IsInf(val, 0) || math.IsNaN(val) {
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stream.Error = fmt.Errorf("unsupported value: %f", val)
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return
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}
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if val < 0 {
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stream.writeByte('-')
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val = -val
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}
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if val > 0x4ffffff {
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stream.WriteFloat64(val)
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return
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}
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precision := 6
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exp := uint64(1000000) // 6
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lval := uint64(val*float64(exp) + 0.5)
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stream.WriteUint64(lval / exp)
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fval := lval % exp
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if fval == 0 {
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return
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}
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stream.writeByte('.')
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for p := precision - 1; p > 0 && fval < pow10[p]; p-- {
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stream.writeByte('0')
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}
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stream.WriteUint64(fval)
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for stream.buf[len(stream.buf)-1] == '0' {
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stream.buf = stream.buf[:len(stream.buf)-1]
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}
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}
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