pingo--util.go 源码阅读

package pingo

import (

    "fmt"

    "math/rand"

    "strings"

)

type meta string  //定义  自定义数据类型

//输出包含自身在内的参数字符串

func (h meta) output(key, val string) {

    fmt.Printf("%s: %s: %s
", string(h), key, val)

}

func (h meta) parse(line string) (key, val string) {

    if line == "" {

        return

    }

    if len(line) < len(string(h)) {

        return

    }

    if line[0:len(string(h))] != string(h) {//比较当前字符串和参数字符串是否是以当前字符串开始的

        return

    }

    line = line[len(string(h))+2:] //当前字符串字符长度+2 截取字符串 到末尾

    end := strings.IndexByte(line, ':') //line中是否包含：字符

    if end < 0 {

        return

    }

    return line[0:end], line[end+2:]

}

var _letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-") //字rune符集合

//随机产生n个字符串返回  

func randstr(n int) string {

    b := make([]rune, n)

    l := len(_letters)

    for i := range b {

        b[i] = _letters[rand.Intn(l)]

    }

    return string(b)

}