Ruby中的任何函数都决定了文件夹级别之间的区别？

发布时间：2020-12-17 02:59:20 所属栏目：百科来源：网络整理

导读：我想要做的是弄清楚一些文件夹是否是儿童/父母之一或不相关. Ruby File API中是否有任何功能？如果不是如何搞清楚？例如： real_path_1 = "/Users/amr/Code/xx/zz"real_path_2 = "/Users/amr/Code/"# when I have to compare between these paths like:f_le

我想要做的是弄清楚一些文件夹是否是儿童/父母之一或不相关.

Ruby File API中是否有任何功能？如果不是如何搞清楚？

例如：

real_path_1 = "/Users/amr/Code/xx/zz"
real_path_2 = "/Users/amr/Code/"
# when I have to compare between these paths like:
f_level(real_path_1,real_path_2)
# it should return +2
# that means real_path_1 is **parent** of real_path_2
# with 2 levels depth

另一个例子：

real_path_1 = "/Users/amr/Code/"
real_path_2 = "/Users/amr/Code/foo/bar/inside"
# when I have to compare between these paths like:
f_level(real_path_1,real_path_2)
# it should return -3
# that means real_path_1 is **child** of real_path_2
# with 3 levels depth

另一个例子：

real_path_1 = "/Users/amr/Code/"
real_path_2 = "/Users/amr/Code/"
# when I have to compare between these paths like:
f_level(real_path_1,real_path_2)
# it should return 0
# that means real_path_1 is **same level** as real_path_2

当返回nil时：

real_path_1 = "/Users/other/Code/" # or "/folder2/"
real_path_2 = "/Users/amr/Code/" # or "/folder1/"
# when I have to compare between these paths like:
f_level(real_path_1,real_path_2)
# it should return nil
# that means real_path_1 is **not at same level** as real_path_2

解决方法

def f_level a,b
    if a[/^#{b}/] && (b[-1,1] == '/' || $'[0,1] == '/')
        $'.scan(/[^/]+/).size
    elsif b[/^#{a}/] && (a[-1,1] == '/')
        -($'.scan(/[^/]+/).size)
    end
end

"/Users/amr/Code/xx/zz"
"/Users/amr/Code/"
2
"/Users/amr/Code/"
"/Users/amr/Code/xx/zz"
-2
"/Users/amr/Code/"
"/Users/amr/Code/"
0
"/Users/other/Code/"
"/Users/amr/Code/"
nil

（编辑：李大同）

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