tree-walker

Generic recursive tree walker

##Usage

    var walker = new TreeWalker(function (node, next) {
        console.log("Enter " + node.id);
        next(TreeWalker.CONTINUE);
    }, function (node, next) {
        console.log("Leave" + node.id);
        next(TreeWalker.ABORT); //Only the first node in the tree
    });

    return walker.walk(tree).then(function () {
        console.log("Done");
    });

The TreeWalker constructor accepts 3 arguments:

• enterNode: function(node, next)
  • node: The node that is being visited
  • next: function(visitresult): Callback that should be invoked to move onto the next node. You may provide an optional visitresult.
• leaveNode: function(node, next)
  • node: The node that is being visited
  • next: function(visitresult): Callback that should be invoked to move onto the next node. You may provide an optional visitresult.
• getChildren: function(node)
  • node: The node to obtain the children of.

##Visit results enterNode and leaveNode can both return a result to the caller, the following values are possible: ####TreeWalker.ABORT Applicable to both enterNode and leaveNode, it will abort the walk of the tree from the current position ####TreeWalker.CONTINUE Applicable to both enterNode and leaveNodethe walk of the tree will be continued, this is equivalent to returning nothing. ####TreeWalker.SKIPCHILDREN Applicable only to enterNode. it will signal the walker to skip the children of the current node. ####TreeWalker.SKIPSIBLINGS Applicable to both enterNode and leaveNode, it signal the walker to skip the siblings of the current node.