蛇形字符串、驼峰字符串相互转换.go

// 转换为蛇形字符串，例如: XxYy to xx_yy , XxYY to xx_yy

// snake string, XxYy to xx_yy , XxYY to xx_yy
func snakeString(s string) string {
    data := make([]byte, 0, len(s)*2)
    j := false
    num := len(s)
    for i := 0; i < num; i++ {
        d := s[i]
        if i > 0 && d >= 'A' && d <= 'Z' && j {
            data = append(data, '_')
        }
        if d != '_' {
            j = true
        }
        data = append(data, d)
    }
    return strings.ToLower(string(data[:]))
}

// camel string, xx_yy to XxYy
func camelString(s string) string {
    data := make([]byte, 0, len(s))
    j := false
    k := false
    num := len(s) - 1
    for i := 0; i <= num; i++ {
        d := s[i]
        if k == false && d >= 'A' && d <= 'Z' {
            k = true
        }
        if d >= 'a' && d <= 'z' && (j || k == false) {
            d = d - 32
            j = false
            k = true
        }
        if k && d == '_' && num > i && s[i+1] >= 'a' && s[i+1] <= 'z' {
            j = true
            continue
        }
        data = append(data, d)
    }
    return string(data[:])
}