Magical enhanced SwiftyJSON with tree traversal

SwifyJSONExtension.swift

// Magical enhanced SwiftyJSON with tree traversal
/*
 ex:
 let a_b_c = JSONTree(root: demoJSON, keyPath: ["a", "b", "c"])
 print(a_b_c.parentNode.parentNode["n"])
 */
struct JSONTree {
    var root:JSON
    var keyPath:[JSONSubscriptType]
    
    var currentJSON:JSON {
        return root[keyPath]
    }
    
    var parentNode:JSONTree {
        var keyPathCopy = keyPath
        keyPathCopy.popLast()
        return JSONTree(root: root, keyPath: keyPathCopy)
    }
    
    subscript(path: [JSONSubscriptType]) -> JSON {
        return currentJSON[path]
    }
    
    subscript(path: JSONSubscriptType...) -> JSON {
        return currentJSON[path]
    }
}