非ASCII字符串对其输出代码

non_ascii_string_align.go

package main

import (
	"fmt"
	"strings"
	"unicode/utf8"
)

func main() {
	a := "中文A是不是很长啊对的很"
	b := "ZWA.ABC.ABC"

	fmt.Printf("|%s|\n", padString(a, 24))
	fmt.Printf("|%s|\n", padString(b, 24))
	fmt.Printf("|%s|\n", padString(b, -24))

	fmt.Printf("|%s|\n", strings.Replace(a, "", "", 24))
	fmt.Printf("|%s|\n", strings.Replace(b, "", "", 24))
}

//调整字符串宽度，不足部分填空格，非ASCII算两个字符
func padString(str string, length int) string {
	var padLeft bool

	if length < 0 {
		padLeft = true
		length *= -1
	}

	runeCount := utf8.RuneCountInString(str)
	if runeCount == 0 || runeCount >= length {
		return str
	}

	length -= runeCount
	length -= (len(str) - runeCount) / 2

	//左
	if length <= 0 {
		return str
	} else if padLeft {
		return str + strings.Repeat(" ", length)
	} else {
		return strings.Repeat(" ", length) + str
	}
}