DOM traversing element selector

jdQuery

var $ = function (selector) {
  var tree = traverse(document.body.children);
  var search = format(selector);
  var labels = ['nodeName', 'className', 'id'];
  var elements = [];
  var match;

  tree.forEach(function(node) {
    match = true;
    search.forEach(function(query, i) {
      if (query) {

        if (node[labels[i]].toLowerCase().indexOf(query) === -1) {
          match = null;
        }
        
      }
    });

    if (match) {
      elements.push(node);
    }
  });

  return elements;
};


function traverse(dom) {
  var results = [];
  for(var i = 0; i < dom.length ; i++) {
    results.push(dom[i]);
  }
  return results;
}


function format(selector) {
  var search = [];
  var temp;
  var blueprint = {
      selectorTag: '',
      selectorClass: '',
      selectorId: ''
    };


  if (selector.indexOf('.') !== -1 && selector.indexOf('#') !== -1) {

    if (selector.indexOf('#') > selector.indexOf('.')) {

      blueprint.selectorTag = selector.split('.')[0];
      temp = selector.split('.')[1];
      blueprint.selectorClass = temp.split('#')[0];
      blueprint.selectorId = temp.split('#')[1];

    } else if (selector.indexOf('#') < selector.indexOf('.')) {

      blueprint.selectorTag = selector.split('#')[0];
      temp = selector.split('#')[1];
      blueprint.selectorClass = temp.split('.')[1];
      blueprint.selectorId = temp.split('.')[0];
    }

  } else if (selector.indexOf('.') !== -1 && selector.indexOf('#') === -1) {

    blueprint.selectorTag = selector.split('.')[0];
    blueprint.selectorClass = selector.split('.')[1];

  } else if (selector.indexOf('#') !== -1 && selector.indexOf('.') === -1) {

    blueprint.selectorTag = selector.split('#')[0];
    blueprint.selectorId = selector.split('#')[1];

  } else {

    blueprint.selectorTag = selector;

  }

  for (var key in blueprint){
    search.push(blueprint[key]);
  }

  return search;
}