rebol 中的递归问题

Question

我有一个块，我想

folders: [
    Chrome [
        content [
            preferences
            prefpages
        ]
    ]
    icons [
        default
    ]
    locale [
        en-EN [
            csbar
        ]
    ]
    skin
]

用这个函数递归迭代：

iterate-folder: func [folders [block!]][
    foreach folder folders [
        either not block? folder [
            probe folder
            temp: folder
            input
        ] [
            print "folder"
            probe folder
            print "folders"
            probe folders
            probe select folders folder
            type-folder: type? select folders folder
            probe type-folder
            input
            iterate-folder select folders folder
        ]
    ]
]

但由于愚蠢的原因我看不到，探针文件夹上面没有返回任何内容，所以它不起作用。

Answer 1

我认为是选择文件夹文件夹搞乱了它......文件夹已经是你想要的数据结构了。

试试这个（还要注意询问而不是输入只是为了在此时添加调试字符串）：

iterate-folder: func [folders [block!]][
    foreach folder folders [
        either not block? folder [
            probe folder
            temp: folder
            ask "continue/not block"
    ] [
            print "folder"
            probe folder
            print "folders"
            probe folders
            probe select folders folder
            type-folder: folder
            probe type-folder
            ask "continue/block"
            iterate-folder folder 
        ]
    ]
]