dynatrace-cordova-outsystems-plugin/node_modules/symbol-tree/lib/TreeIterator.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

'use strict';

const TREE = Symbol();
const ROOT = Symbol();
const NEXT = Symbol();
const ITERATE_FUNC = Symbol();

class TreeIterator {
        constructor(tree, root, firstResult, iterateFunction) {
                this[TREE] = tree;
                this[ROOT] = root;
                this[NEXT] = firstResult;
                this[ITERATE_FUNC] = iterateFunction;
        }

        next() {
                const tree = this[TREE];
                const iterateFunc = this[ITERATE_FUNC];
                const root = this[ROOT];

                if (!this[NEXT]) {
                        return {
                                done: true,
                                value: root,
                        };
                }

                const value = this[NEXT];

                if (iterateFunc === 1) {
                        this[NEXT] = tree._node(value).previousSibling;
                }
                else if (iterateFunc === 2) {
                        this[NEXT] = tree._node(value).nextSibling;
                }
                else if (iterateFunc === 3) {
                        this[NEXT] = tree._node(value).parent;
                }
                else if (iterateFunc === 4) {
                        this[NEXT] = tree.preceding(value, {root: root});
                }
                else /* if (iterateFunc === 5)*/ {
                        this[NEXT] = tree.following(value, {root: root});
                }

                return {
                        done: false,
                        value: value,
                };
        }
}

Object.defineProperty(TreeIterator.prototype, Symbol.iterator, {
        value: function() {
                return this;
        },
        writable: false,
});

TreeIterator.PREV = 1;
TreeIterator.NEXT = 2;
TreeIterator.PARENT = 3;
TreeIterator.PRECEDING = 4;
TreeIterator.FOLLOWING = 5;

Object.freeze(TreeIterator);
Object.freeze(TreeIterator.prototype);

module.exports = TreeIterator;