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如何在平行結(jié)構(gòu)里處理樹(shù)形結(jié)構(gòu)的數(shù)據(jù)

var?t?xml.Token
var?inItemGroup?bool
for?t,?err?=?decoder.Token();?err?==?nil;?t,?err?=?decoder.Token(){
????switch?token?:=?t(type){
????case?xml.StarElement:
????????name?:=?token.Name.Local
????????if?inItemGroup{
????????????if?name?==?"Compile"{
????????????//?第二步，處理標(biāo)記事件
????????????????fmt.Println(name)
????????????}
????????}else{
????????????if?name?==?"ItemGroup"{
????????????//?第一步，找到就開(kāi)啟標(biāo)記
????????????????inItemGroup?=?true
????????????}
????????}
????}
????case?xml.EndElement:
????//?結(jié)束標(biāo)簽?</EndElement>?標(biāo)記
????????if?inItemGroup{
????????????if?token.Name.Local?==?"ItemGroup"{
????????????//?第三步,?關(guān)閉標(biāo)記
????????????????inItemGroup?=?false
????????????}
????????????
????????}
}

經(jīng)驗(yàn)和建議

• 字符串處理切勿造輪子

• 字符串轉(zhuǎn)化注意錯(cuò)誤處理

• flag.Parse 記得調(diào)

• 新需求盡量用 json

實(shí)戰(zhàn)！

• 從 VS 工程文件獲取文件列表

• 模擬命令行拷貝文件

基礎(chǔ)知識(shí)

• 字符串基本操作，和其他類型的互相轉(zhuǎn)化

• XML 編碼處理

• 命令行解析

package?main

import?(
???"bufio"
???"flag"
???"fmt"
???"io"
???"os"
???"strings"
)

func?fileExists(filename?string)?bool?{
???_,?err?:=?os.Stat(filename)
???return?err?==?nil?||?os.IsExist(err)
}

//?拷貝文件的行文
func?copyFileAction(src,?dst?string,?showProgress,?force?bool)?{
???if?!force?{
??????if?fileExists(dst)?{
?????????fmt.Printf("%s?exists,?override??y/n\n",?dst)
?????????reader?:=?bufio.NewReader(os.Stdin)
?????????data,?_,?_?:=?reader.ReadLine()

?????????if?strings.TrimSpace(string(data))?!=?"y"?{
????????????return
?????????}
??????}
???}

???copyFile(src,?dst)

???if?showProgress?{
??????fmt.Printf("'%s'?->?'%s'\n",?src,?dst)
???}
}

func?copyFile(src?string,?dst?string)?(w?int64,?err?error)?{
???srcFile,?err?:=?os.Open(src)
???if?err?!=?nil?{
??????fmt.Println(err.Error())
??????return
???}
???defer?srcFile.Close()

???dstFile,?err?:=?os.Create(dst)
???if?err?!=?nil?{
??????fmt.Println(err.Error())
??????return
???}
???defer?dstFile.Close()

???return?io.Copy(dstFile,?srcFile)
}

func?main()?{
???var?showProgress,?force?bool
???
???flag.BoolVar(&force,?"f",?false,?"force?copy?when?existing")
???flag.BoolVar(&showProgress,?"v",?false,?"explain?what?is?being?done")
???
???flag.Parse()
???
???if?flag.NArg()?<?2?{
??????flag.Usage()
??????return
???}

???copyFileAction(flag.Arg(0),?flag.Arg(1),?showProgress,?force)
}

-f：強(qiáng)制執(zhí)行

-v：輸出拷貝動(dòng)作

命令行解析 GO

模擬 Linux 中的 CP 指令

模擬命令行拷貝

package?main

import?(
???"bytes"
???"encoding/xml"
???"fmt"
???"io/ioutil"
)

func?main()?{
???content,?err?:=?ioutil.ReadFile("vsproj.csproj")
???
???decoder?:=?xml.NewDecoder(bytes.NewBuffer(content))

???var?t?xml.Token
???var?inItemGroup?bool
???for?t,?err?=?decoder.Token();?err?==?nil;?t,?err?=?decoder.Token()?{
??????switch?token?:=?t.(type)?{
??????case?xml.StartElement:
?????????name?:=?token.Name.Local

?????????if?inItemGroup?{
????????????if?name?==?"Compile"?{
???????????????fmt.Println(getAttributeValue(token.Attr,?"Include"))
????????????}
?????????}?else?{
????????????if?name?==?"ItemGroup"?{
???????????????inItemGroup?=?true
????????????}
?????????}
??????case?xml.EndElement:
??????}
???}
}

func?getAttributeValue(attr?[]xml.Attr,?name?string)?string?{
???for?_,?a?:=?range?attr{
??????if?a.Name.Local?==?name?{
?????????return?a.Value
??????}
???}

???return?""
}

package?main

import?(
???"flag"
???"fmt"
)

func?style()??{
???//?格式化定義
???methodPtr?:=?flag.String("method",?"default",?"method?of?sample")
???valuePtr?:=?flag.Int("value",?-1,?"value?of?sample")

???//?解析
???flag.Parse()

???fmt.Println(*methodPtr,?*valuePtr)
}

func?style2()??{
???var?method?string
???var?value?int

???flag.StringVar(&method,?"method",?"default",?"method?of?sample")
???flag.IntVar(&value,?"value",?-1,?"value?of?sample")

???flag.Parse()

???fmt.Println(method,?value)
}

func?main()?{
???style2()
}

package?main

import?(
???"fmt"
???"os"
)

func?main()?{
???fmt.Println(os.Args)
}

package?main

import?(
???"encoding/xml"
???"fmt"
)

//?人物檔案
type?person?struct?{
???Name?string?`xml:"name,attr"`
???Age?int?`xml:"年齡"`
}

func?main()?{
???p?:=?person{
??????Name:?"Davy",
??????Age:??18,
???}

???data,?err?:=?xml.MarshalIndent(p,?"",?"????")
???if?err?!=?nil?{
??????fmt.Println(err)
??????return
???}
???fmt.Println(string(data))

???var?p2?person

???err?=?xml.Unmarshal(data,?&p2)
???if?err?!=?nil?{
??????fmt.Println(err)
??????return
???}
???fmt.Println(p2)
}

//?基本數(shù)值轉(zhuǎn)換
fmt.Println(strconv.Itoa(10))
fmt.Println(strconv.Atoi("711"))

//?解析
fmt.Println(strconv.ParseBool("false"))
fmt.Println(strconv.ParseFloat("3.14",?64))

//?格式化
fmt.Println(strconv.FormatBool(true))
fmt.Println(strconv.FormatInt(123,?2))

s?:=?"hello?world"

//?是否包含
fmt.Println(strings.Contains(s,?"hello"),?strings.Contains(s,?"?"))

//?索引，base?0
fmt.Println(strings.Index(s,?"o"))

ss?:=?"1#2#345"

//?切割字符串
splitedStr?:=?strings.Split(ss,?"#")
fmt.Println(splitedStr)

//?合并字符串
fmt.Println(strings.Join(splitedStr,?"#"))

fmt.Println(strings.HasPrefix(s,?"he"),?strings.HasSuffix(s,?"ld"))

字符串基本操作

實(shí)戰(zhàn)

• 從 VS 工程文件獲取文件列表

• 模擬命令行拷貝文件