Get unquoted text

Unquoted.js

function extract(mv){
  //NodeIterators are really cool: https://developer.mozilla.org/en-US/docs/Web/API/NodeIterator
  var nodeIterator = document.createNodeIterator(
    mv.getBodyElement(),
    NodeFilter.SHOW_ELEMENT, 
    {
      acceptNode: function(node){
        //this is the main function where the interesting code occurs
        //because node iterator is a recursive tree walk you'll see every node below the body element
        //this includes nodes that contain both the html we want, and html we don't want
        //the strategy I took here is to only accept nodes that don't contain the quoted area
        //and I do that by checking if any of the descendants are in the quoted area
        return containsNoElementsInQuotedArea(node, mv)
      }
    }
  );
  
  var includedNodes = [];
  var result = '';
  var node;
  while(node = nodeIterator.nextNode()){
    //because nodeIterator is recursive we're going to be seeing nodes that have already
    //been added, because an ancestor has been added to the result
    //so to make sure we don't readd the same html multiple times, we need to check if the node
    //has already been added through the ancestor
    if(doesNotAlreadyContainNode(includedNodes, node)){
      result += node.outerHTML;
      includedNodes.push(node);
    }
  }
  
  return result;
}

//accepts a node, and the messageView, does a node walk to see if any of this node's
//descendants are in the quoted area, and if they are, then we return false
//otherwise if this node does not contain the quoted area return true
function containsNoElementsInQuotedArea(node, mv){
  var nodeIterator = 
    document.createNodeIterator(
      node, 
      NodeFilter.SHOW_ELEMENT, 
      {
        acceptNode: function(childNode){
          return mv.isElementInQuotedArea(childNode);
        }
      }
    );
  
  //if we ever see a node, that means it's in the quoted area and return false
  while(nodeIterator.nextNode()){
    return false;
  }
  //we didn't see any nodes in the quoted area, so we're good!
  return true;
}


//iterates through includedNodes, and returns true if candidate
//node is not a decendent of any
function doesNotAlreadyContainNode(includedNodes, node){
  for(var ii=0; ii<includedNodes.length; ii++){
    if(includedNodes[ii].contains(node)){
      return false;
    }
  }
  
  return true;
}