/
string.go
90 lines (78 loc) · 2 KB
/
string.go
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// Copyright 2020 Douyu
//
// 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 xstring
import (
"encoding/binary"
"encoding/hex"
"fmt"
"net"
"strconv"
)
// Addr2Hex converts address string to hex string, only support ipv4.
func Addr2Hex(str string) (string, error) {
ipStr, portStr, err := net.SplitHostPort(str)
if err != nil {
return "", err
}
ip := net.ParseIP(ipStr).To4()
port, err := strconv.ParseUint(portStr, 10, 16)
if err != nil {
return "", nil
}
buf := make([]byte, 2)
binary.BigEndian.PutUint16(buf, uint16(port))
ip = append(ip, buf...)
return hex.EncodeToString(ip), nil
}
// Hex2Addr converts hex string to address.
func Hex2Addr(str string) (string, error) {
buf, err := hex.DecodeString(str)
if err != nil {
return "", err
}
if len(buf) < 4 {
return "", fmt.Errorf("bad hex string length")
}
return fmt.Sprintf("%s:%d", net.IP(buf[:4]).String(), binary.BigEndian.Uint16(buf[4:])), nil
}
// Strings ...
type Strings []string
// KickEmpty kick empty elements from ss
func KickEmpty(ss []string) Strings {
var ret = make([]string, 0)
for _, str := range ss {
if str != "" {
ret = append(ret, str)
}
}
return Strings(ret)
}
func Kick(ss []string, remove func(item string) bool) Strings {
for i := 0; i < len(ss); i++ {
if remove(ss[i]) {
ss = append(ss[:i], ss[i+1:]...)
i--
}
}
return ss
}
// AnyBlank return true if ss has empty element
func AnyBlank(ss []string) bool {
for _, str := range ss {
if str == "" {
return true
}
}
return false
}