121 lines
2.1 KiB
Go
121 lines
2.1 KiB
Go
//
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// str_helper.go
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// Copyright (C) 2022 tiglog <me@tiglog.com>
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//
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// Distributed under terms of the MIT license.
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//
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package helper
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import (
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"math/rand"
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"time"
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"unicode"
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"github.com/rs/xid"
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"git.hexq.cn/tiglog/golib/crypto/gmd5"
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)
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// 是否是字符串
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func IsString(v interface{}) bool {
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_, ok := v.(string)
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return ok
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}
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// 随机字符串
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func RandString(n int) string {
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letterRunes := []rune("1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
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rand.Seed(time.Now().UnixNano())
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b := make([]rune, n)
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for i := range b {
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b[i] = letterRunes[rand.Intn(len(letterRunes))]
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}
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return string(b)
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}
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// 首字母大写
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func UcFirst(str string) string {
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for _, v := range str {
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u := string(unicode.ToUpper(v))
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return u + str[len(u):]
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}
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return ""
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}
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// 首字母小写
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func LcFirst(str string) string {
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for _, v := range str {
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u := string(unicode.ToLower(v))
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return u + str[len(u):]
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}
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return ""
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}
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// 乱序字符串
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func Shuffle(str string) string {
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if str == "" {
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return str
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}
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runes := []rune(str)
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index := 0
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for i := len(runes) - 1; i > 0; i-- {
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index = rand.Intn(i + 1)
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if i != index {
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runes[i], runes[index] = runes[index], runes[i]
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}
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}
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return string(runes)
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}
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// 反序字符串
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func Reverse(str string) string {
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n := len(str)
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runes := make([]rune, n)
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for _, r := range str {
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n--
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runes[n] = r
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}
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return string(runes[n:])
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}
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// 唯一字符串
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// 返回字符串长度为 20
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func GenId() string {
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guid := xid.New()
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return guid.String()
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}
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// 可变长度的唯一字符串
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// 长度太短，可能就不唯一了
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// 长度大于等于 16 为最佳
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// 长度小于20时，为 GenId 的值 md5 后的前缀，因此，理论上前6位也能在大多数情况
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// 下唯一
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func Uniq(l int) string {
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if l <= 0 {
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panic("wrong length param")
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}
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ret := GenId()
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hl := len(ret)
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if l < hl {
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t, err := gmd5.EncryptString(ret)
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if err != nil {
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return ret[hl-l:]
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}
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return t[:l]
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}
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mhac_len := 6
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pl := len(ret)
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var hash string
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for l > pl {
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hash = GenId()
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hash = hash[mhac_len:]
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ret += hash
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pl += len(hash)
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}
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// log.Println("ret=", ret, ", pl=", pl, ", l=", l)
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return ret[0:l]
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}
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