uwire/index.js

A way to create persistent fragments

var uwire = (function (exports) {
  'use strict';

  var _ref = [],
      slice = _ref.slice;

  var ELEMENT_NODE = 1;
  var nodeType = 111;

  var remove = function remove(_ref) {
    var firstChild = _ref.firstChild,
        lastChild = _ref.lastChild;
    var range = document.createRange();
    range.setStartAfter(firstChild);
    range.setEndAfter(lastChild);
    range.deleteContents();
    return firstChild;
  };

  var diffable = function diffable(node, operation) {
    return node.nodeType === nodeType ? 1 / operation < 0 ? operation ? remove(node) : node.lastChild : operation ? node.valueOf() : node.firstChild : node;
  };
  var persistent = function persistent(fragment) {
    var childNodes = fragment.childNodes;
    var length = childNodes.length;
    if (length < 2) return length ? childNodes[0] : fragment;
    var nodes = slice.call(childNodes, 0);
    var firstChild = nodes[0];
    var lastChild = nodes[length - 1];
    return {
      ELEMENT_NODE: ELEMENT_NODE,
      nodeType: nodeType,
      firstChild: firstChild,
      lastChild: lastChild,
      valueOf: function valueOf() {
        if (childNodes.length !== length) {
          var i = 0;

          while (i < length) {
            fragment.appendChild(nodes[i++]);
          }
        }

        return fragment;
      }
    };
  };

  exports.diffable = diffable;
  exports.persistent = persistent;

  return exports;

}({}));