/
numeral.go
81 lines (73 loc) · 1.7 KB
/
numeral.go
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// Copyright (c) 2021 Terminus, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package numeral
import (
"math"
"strconv"
)
// Formalize every readable unit (e.g. 10Mi 100G 30K 1024) to byte
func FormalizeUnitToByte(raw string) (int64, error) {
var length = len(raw)
if length == 0 {
return 0, nil
}
var base int64
var roundPart string
if raw[length-1:] == "i" {
base = 1024
roundPart = raw[:length-1]
length = length - 1
} else {
base = 1000
roundPart = raw
}
var round int
switch roundPart[length-1:] {
case "E":
round = 6
case "P":
round = 5
case "T":
round = 4
case "G":
round = 3
case "M":
round = 2
case "K":
round = 1
default:
round = 0
}
var numberPart string
if round != 0 {
numberPart = roundPart[:length-1]
length = length - 1
} else {
numberPart = roundPart
}
ret, err := strconv.ParseInt(numberPart, 10, 32)
if err != nil {
return 0, err
}
for i := 0; i < round; i++ {
ret = ret * base
}
return ret, nil
}
// Round 保留小数点计算
func Round(f float64, n int) float64 {
shift := math.Pow(10, float64(n))
fv := 0.0000000001 + f //对浮点数产生.xxx999999999 计算不准进行处理
return math.Floor(fv*shift+.5) / shift
}