parse-domain/lib/trie/nodes.js

Splits an url into sub-domain, domain and effective top-level-domain

"use strict";

function createNode() {
  var domain = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
  return {
    domain: domain,
    children: new Map(),
    parent: null
  };
}

function createOrGetChild(parent, domain) {
  var child = parent.children.get(domain);

  if (child === undefined) {
    child = createNode(domain);
    adoptChild(parent, child);
  }

  return child;
}

function adoptChild(parent, child) {
  if (typeof child.domain !== "string") {
    throw new Error("Cannot adopt child: child.domain must be a string");
  }

  if (parent.children.has(child.domain)) {
    throw new Error("Cannot adopt child: parent has already a child with the domain '".concat(child.domain, "'"));
  }

  parent.children.set(child.domain, child);
  child.parent = parent;
}

module.exports = {
  createNode: createNode,
  createOrGetChild: createOrGetChild,
  adoptChild: adoptChild
};