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48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
2 years ago
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package stt
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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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ff := 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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ff = 'e'
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}
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}
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stream.buf = strconv.AppendFloat(stream.buf, float64(val), ff, -1, 32)
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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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ff := 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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ff = 'e'
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}
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}
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stream.buf = strconv.AppendFloat(stream.buf, val, ff, -1, 64)
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}
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