pivot-editor/index.html

<script>
var N = {
    Create:(inMeta, ...inChildren)=>
    {
        var output = {
            Meta:inMeta,

            Children:[],
            Parents:[],
            WalkID:0,

            edited:[],
            editing:[]
        };
        inChildren.forEach( inChild => N.Connect(output, inChild) );
        return output;
    },
    Connect:(inParent, inChild)=>
    {
        inParent.Children.push(inChild);
        inChild.Parents.push(inParent);
    },
    Walk:(inNode, inKey, inIterator, inWalkID) =>
    {
        let array = inNode[inKey];
        for(let i=0; i<array.length; i++)
        {
            let next = array[i];
            if(next.WalkID == inWalkID)
            {
                // weve already been here this walk
            }
            else
            {
                next.WalkID = inWalkID;
                let results = inIterator(next);
                if(results !== false)
                {
                    N.Walk(next, inKey, inIterator, inWalkID);
                }
                else
                {
                    // quit code returned
                }
            }
        }
    },
    WalkChildren:(inNode, inIterator, inWalkID) =>
    {
        N.Walk(inNode, "Children", inIterator, inWalkID);
    },
    WalkParents:(inNode, inIterator, inWalkID) =>
    {
        N.Walk(inNode, "Parents", inIterator, inWalkID);
    }
};
</script>
<script>
let tree1 = N.Create("root1",
    N.Create("branch1", 
        N.Create("leaf1"),
        N.Create("leaf2"),
        N.Create("leaf3"),
    ),
    N.Create("branch2",
        N.Create("leaft3"),
        N.Create("leaft4")
    )
);

let leaves = [];
let leavesCollect = n=>
{
    if(n.Children.length == 0)
    {
        leaves.push(n);
    }
};
N.WalkChildren(tree1, leavesCollect, 1);

let tree2 = N.Create("root2", 
    N.Create("branch3",
        N.Create("leaf5"),
        N.Create("leaf6")
    ),
    N.Create("branch4", ...leaves)
);

let echo = n=>console.log(n.Meta, n.WalkID);

//N.WalkChildren(tree1, echo, 2);
//N.WalkChildren(tree2, echo, 3);

let orchard = N.Create("orchard", tree1, tree2);
N.WalkParents(leaves[0], echo, 4);

</script>