mirror of
https://github.com/cubefs/cubefs.git
synced 2026-08-02 10:06:14 +00:00
68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
// Copyright 2018 The CubeFS Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied. See the License for the specific language governing
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// permissions and limitations under the License.
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package util
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import (
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"math/rand"
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"strings"
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"time"
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)
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func SubString(sourceString string, begin, end int) string {
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bytes := []byte(sourceString)
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stringLength := len(bytes)
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if begin < 0 {
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begin = 0
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}
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if end > stringLength {
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end = stringLength
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}
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return string(bytes[begin:end])
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}
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type RandomSeed byte
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func (s RandomSeed) Runes() []rune {
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sourceBuilder := strings.Builder{}
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if s&Numeric > 0 {
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sourceBuilder.WriteString("0123456789")
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}
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if s&LowerLetter > 0 {
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sourceBuilder.WriteString("abcdefghijklmnopqrstuvwxyz")
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}
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if s&UpperLetter > 0 {
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sourceBuilder.WriteString("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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}
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return []rune(sourceBuilder.String())
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}
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const (
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Numeric RandomSeed = 1 << iota
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LowerLetter
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UpperLetter
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)
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func RandomString(length int, seed RandomSeed) string {
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runs := seed.Runes()
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result := ""
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for i := 0; i < length; i++ {
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rand.Seed(time.Now().UnixNano())
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randNumber := rand.Intn(len(runs))
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result += string(runs[randNumber])
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}
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return result
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}
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