retrieve all text nodes which are not made of space characters using TreeWalker API

gistfile1.js

/**
 * Retrieve all text nodes which are not
 * made of space characters.
 * @return {Array} A collection of text nodes
 **/
var getTextNodes = function() {
  var walker = document.createTreeWalker(
      this.rootElement,
      NodeFilter.SHOW_TEXT,
      null,
      false
    ),
    node = walker.nextNode(),
    textNodes = [];

  while(node) {

    if(!this.REGEXP_SPACES.test(node.nodeValue)) {
      textNodes.push(node);
    }
      
    node = walker.nextNode();
  }

  return textNodes;
};