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std: float64/32 clean up e-09 to e-9

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This commit is contained in:
molon 2022-09-15 21:13:32 +08:00
parent bf8b920736
commit 10b9ac0971
2 changed files with 21 additions and 4 deletions
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16
stream_float.go
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@ -27,6 +27,14 @@ func (stream *Stream) WriteFloat32(val float32) {
}
}
stream.buf = strconv.AppendFloat(stream.buf, float64(val), fmt, -1, 32)
if fmt == 'e' {
// clean up e-09 to e-9
n := len(stream.buf)
if n >= 4 && stream.buf[n-4] == 'e' && stream.buf[n-3] == '-' && stream.buf[n-2] == '0' {
stream.buf[n-2] = stream.buf[n-1]
stream.buf = stream.buf[:n-1]
}
}
}
// WriteFloat32Lossy write float32 to stream with ONLY 6 digits precision although much much faster
@ -76,6 +84,14 @@ func (stream *Stream) WriteFloat64(val float64) {
}
}
stream.buf = strconv.AppendFloat(stream.buf, float64(val), fmt, -1, 64)
if fmt == 'e' {
// clean up e-09 to e-9
n := len(stream.buf)
if n >= 4 && stream.buf[n-4] == 'e' && stream.buf[n-3] == '-' && stream.buf[n-2] == '0' {
stream.buf[n-2] = stream.buf[n-1]
stream.buf = stream.buf[:n-1]
}
}
}
// WriteFloat64Lossy write float64 to stream with ONLY 6 digits precision although much much faster

9
value_tests/float_test.go
View File

@ -4,10 +4,11 @@ import (
"bytes"
"encoding/json"
"fmt"
"github.com/json-iterator/go"
"github.com/stretchr/testify/require"
"strconv"
"testing"
jsoniter "github.com/json-iterator/go"
"github.com/stretchr/testify/require"
)
func Test_read_float(t *testing.T) {
@ -88,7 +89,7 @@ func Test_write_float32(t *testing.T) {
stream = jsoniter.NewStream(jsoniter.ConfigDefault, nil, 0)
stream.WriteFloat32(float32(0.0000001))
should.Equal("1e-07", string(stream.Buffer()))
should.Equal("1e-7", string(stream.Buffer()))
}
func Test_write_float64(t *testing.T) {
@ -125,5 +126,5 @@ func Test_write_float64(t *testing.T) {
stream = jsoniter.NewStream(jsoniter.ConfigDefault, nil, 0)
stream.WriteFloat64(float64(0.0000001))
should.Equal("1e-07", string(stream.Buffer()))
should.Equal("1e-7", string(stream.Buffer()))
}