golang 比较字符串 版本号大小

示例如下：

package main
 
import "fmt"
 
func Versionordinal(version string) string {
	// ISO/IEC 14651:2011
	const maxByte = 1<<8 - 1
	vo := make([]byte,len(version)+8)
	j := -1
	for i := 0; i < len(version); i++ {
		b := version[i]
		if '0' > b || b > '9' {
			vo = append(vo,b)
			j = -1
			continue
		}
		if j == -1 {
			vo = append(vo,0x00)
			j = len(vo) - 1
		}
		if vo[j] == 1 && vo[j+1] == '0' {
			vo[j+1] = b
			continue
		}
		if vo[j]+1 > maxByte {
			panic("Versionordinal: invalid version")
		}
		vo = append(vo,b)
		vo[j]++
	}
	return string(vo)
}
 
func main() {
	versions := []struct{ a,b string }{
		{"1.05.00.0156","1.0.221.9289"},// Go versions
		{"1","1.0.1"},{"1.0.1","1.0.2"},{"1.0.2","1.0.3"},{"1.0.3","1.1"},{"1.1","1.1.1"},{"1.1.1","1.1.2"},{"1.1.2","1.2"},}
	for _,version := range versions {
		a,b := Versionordinal(version.a),Versionordinal(version.b)
		switch {
		case a > b:
			fmt.Println(version.a,">",version.b)
		case a < b:
			fmt.Println(version.a,"<",version.b)
		case a == b:
			fmt.Println(version.a,"=",version.b)
		}
	}
}
 

运行结果：

1.05.00.0156 > 1.0.221.9289
1 < 1.0.1
1.0.1 < 1.0.2
1.0.2 < 1.0.3
1.0.3 < 1.1
1.1 < 1.1.1
1.1.1 < 1.1.2
1.1.2 < 1.2