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新增去除乱码的长度限制函数

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This commit is contained in:
苏尹岚
2020-03-13 10:26:49 +08:00
parent cb16c4179f
commit c2d160663c
1 changed files with 79 additions and 4 deletions
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83
utils/utils.go
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@@ -1,6 +1,7 @@
package utils
import (
"bytes"
"encoding/base64"
"net/http"
"reflect"
@@ -287,15 +288,44 @@ func LimitStringLen(str string, maxByteCount int) (limitedStr string) {
// 限制的是字符数，不是字节数
func LimitUTF8StringLen(str string, maxRuneCount int) (limitedStr string) {
str2 := ""
bs := []byte(str)
bl := 0
for i := len(bs) - 1; i >= 0; i-- {
switch {
case bs[i] >= 0 && bs[i] <= 127:
return string(bs[:i+1])
case bs[i] >= 128 && bs[i] <= 191:
bl++
case bs[i] >= 192 && bs[i] <= 253:
cl := 0
switch {
case bs[i]&252 == 252:
cl = 6
case bs[i]&248 == 248:
cl = 5
case bs[i]&240 == 240:
cl = 4
case bs[i]&224 == 224:
cl = 3
default:
cl = 2
}
if bl+1 == cl {
str2 = string(bs[:i+cl])
}
str2 = string(bs[:i])
}
}
if maxRuneCount > 0 {
if len(str) > maxRuneCount {
runeList := []rune(str)
if len(str2) > maxRuneCount {
runeList := []rune(str2)
if len(runeList) > maxRuneCount {
str = string(runeList[:maxRuneCount])
str2 = string(runeList[:maxRuneCount])
}
}
}
return str
return str2
}
// 限制的是字节数，正常处理乱码
@@ -337,3 +367,48 @@ func LimitMixedStringLen(str string, maxByteCount int) (limitedStr string) {
}
return ""
}
// 限制的是字符数，不是字节数
func LimitUTF8StringLen2(str string, maxRuneCount int) (limitedStr string) {
str2 := ""
bs := []byte(str)
bl := 0
for i := len(bs) - 1; i >= 0; i-- {
switch {
case bs[i] >= 0 && bs[i] <= 127 && bs[i] != 42 && bs[i] != 40 && bs[i] != 41:
bs2 := bs[:i]
bs3 := bs[i+1:]
bs4 := [][]byte{bs2, bs3}
return string(bytes.Join(bs4, []byte("")))
case bs[i] >= 128 && bs[i] <= 191:
bl++
case bs[i] >= 192 && bs[i] <= 253:
cl := 0
switch {
case bs[i]&252 == 252:
cl = 6
case bs[i]&248 == 248:
cl = 5
case bs[i]&240 == 240:
cl = 4
case bs[i]&224 == 224:
cl = 3
default:
cl = 2
}
if bl+1 == cl {
str2 = string(bs[:i+cl])
}
str2 = string(bs[:i])
}
}
if maxRuneCount > 0 {
if len(str2) > maxRuneCount {
runeList := []rune(str2)
if len(runeList) > maxRuneCount {
str2 = string(runeList[:maxRuneCount])
}
}
}
return str2
}