Add m-esr52 at 52.6.0

1 files changed, 1863 insertions, 0 deletions

diff --git a/toolkit/components/reader/Readability.js b/toolkit/components/reader/Readability.js
new file mode 100644
index 000000000..491461a8e
--- /dev/null
+++ b/toolkit/components/reader/Readability.js
@@ -0,0 +1,1863 @@
+/*eslint-env es6:false*/
+/*
+ * DO NOT MODIFY THIS FILE DIRECTLY!
+ *
+ * This is a shared library that is maintained in an external repo:
+ * https://github.com/mozilla/readability
+ */
+
+/*
+ * Copyright (c) 2010 Arc90 Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * This code is heavily based on Arc90's readability.js (1.7.1) script
+ * available at: http://code.google.com/p/arc90labs-readability
+ */
+
+/**
+ * Public constructor.
+ * @param {Object}       uri     The URI descriptor object.
+ * @param {HTMLDocument} doc     The document to parse.
+ * @param {Object}       options The options object.
+ */
+function Readability(uri, doc, options) {
+  options = options || {};
+
+  this._uri = uri;
+  this._doc = doc;
+  this._biggestFrame = false;
+  this._articleByline = null;
+  this._articleDir = null;
+
+  // Configureable options
+  this._debug = !!options.debug;
+  this._maxElemsToParse = options.maxElemsToParse || this.DEFAULT_MAX_ELEMS_TO_PARSE;
+  this._nbTopCandidates = options.nbTopCandidates || this.DEFAULT_N_TOP_CANDIDATES;
+  this._maxPages = options.maxPages || this.DEFAULT_MAX_PAGES;
+
+  // Start with all flags set
+  this._flags = this.FLAG_STRIP_UNLIKELYS |
+                this.FLAG_WEIGHT_CLASSES |
+                this.FLAG_CLEAN_CONDITIONALLY;
+
+  // The list of pages we've parsed in this call of readability,
+  // for autopaging. As a key store for easier searching.
+  this._parsedPages = {};
+
+  // A list of the ETag headers of pages we've parsed, in case they happen to match,
+  // we'll know it's a duplicate.
+  this._pageETags = {};
+
+  // Make an AJAX request for each page and append it to the document.
+  this._curPageNum = 1;
+
+  var logEl;
+
+  // Control whether log messages are sent to the console
+  if (this._debug) {
+    logEl = function(e) {
+      var rv = e.nodeName + " ";
+      if (e.nodeType == e.TEXT_NODE) {
+        return rv + '("' + e.textContent + '")';
+      }
+      var classDesc = e.className && ("." + e.className.replace(/ /g, "."));
+      var elDesc = "";
+      if (e.id)
+        elDesc = "(#" + e.id + classDesc + ")";
+      else if (classDesc)
+        elDesc = "(" + classDesc + ")";
+      return rv + elDesc;
+    };
+    this.log = function () {
+      if (typeof dump !== undefined) {
+        var msg = Array.prototype.map.call(arguments, function(x) {
+          return (x && x.nodeName) ? logEl(x) : x;
+        }).join(" ");
+        dump("Reader: (Readability) " + msg + "\n");
+      } else if (typeof console !== undefined) {
+        var args = ["Reader: (Readability) "].concat(arguments);
+        console.log.apply(console, args);
+      }
+    };
+  } else {
+    this.log = function () {};
+  }
+}
+
+Readability.prototype = {
+  FLAG_STRIP_UNLIKELYS: 0x1,
+  FLAG_WEIGHT_CLASSES: 0x2,
+  FLAG_CLEAN_CONDITIONALLY: 0x4,
+
+  // Max number of nodes supported by this parser. Default: 0 (no limit)
+  DEFAULT_MAX_ELEMS_TO_PARSE: 0,
+
+  // The number of top candidates to consider when analysing how
+  // tight the competition is among candidates.
+  DEFAULT_N_TOP_CANDIDATES: 5,
+
+  // The maximum number of pages to loop through before we call
+  // it quits and just show a link.
+  DEFAULT_MAX_PAGES: 5,
+
+  // Element tags to score by default.
+  DEFAULT_TAGS_TO_SCORE: "section,h2,h3,h4,h5,h6,p,td,pre".toUpperCase().split(","),
+
+  // All of the regular expressions in use within readability.
+  // Defined up here so we don't instantiate them repeatedly in loops.
+  REGEXPS: {
+    unlikelyCandidates: /banner|combx|comment|community|disqus|extra|foot|header|menu|modal|related|remark|rss|share|shoutbox|sidebar|skyscraper|sponsor|ad-break|agegate|pagination|pager|popup/i,
+    okMaybeItsACandidate: /and|article|body|column|main|shadow/i,
+    positive: /article|body|content|entry|hentry|h-entry|main|page|pagination|post|text|blog|story/i,
+    negative: /hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|masthead|media|meta|modal|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget/i,
+    extraneous: /print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i,
+    byline: /byline|author|dateline|writtenby|p-author/i,
+    replaceFonts: /<(\/?)font[^>]*>/gi,
+    normalize: /\s{2,}/g,
+    videos: /\/\/(www\.)?(dailymotion|youtube|youtube-nocookie|player\.vimeo)\.com/i,
+    nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i,
+    prevLink: /(prev|earl|old|new|<|«)/i,
+    whitespace: /^\s*$/,
+    hasContent: /\S$/,
+  },
+
+  DIV_TO_P_ELEMS: [ "A", "BLOCKQUOTE", "DL", "DIV", "IMG", "OL", "P", "PRE", "TABLE", "UL", "SELECT" ],
+
+  ALTER_TO_DIV_EXCEPTIONS: ["DIV", "ARTICLE", "SECTION", "P"],
+
+  /**
+   * Run any post-process modifications to article content as necessary.
+   *
+   * @param Element
+   * @return void
+  **/
+  _postProcessContent: function(articleContent) {
+    // Readability cannot open relative uris so we convert them to absolute uris.
+    this._fixRelativeUris(articleContent);
+  },
+
+  /**
+   * Iterates over a NodeList, calls `filterFn` for each node and removes node
+   * if function returned `true`.
+   *
+   * If function is not passed, removes all the nodes in node list.
+   *
+   * @param NodeList nodeList The no
+   * @param Function filterFn
+   * @return void
+   */
+  _removeNodes: function(nodeList, filterFn) {
+    for (var i = nodeList.length - 1; i >= 0; i--) {
+      var node = nodeList[i];
+      var parentNode = node.parentNode;
+      if (parentNode) {
+        if (!filterFn || filterFn.call(this, node, i, nodeList)) {
+          parentNode.removeChild(node);
+        }
+      }
+    }
+  },
+
+  /**
+   * Iterate over a NodeList, which doesn't natively fully implement the Array
+   * interface.
+   *
+   * For convenience, the current object context is applied to the provided
+   * iterate function.
+   *
+   * @param  NodeList nodeList The NodeList.
+   * @param  Function fn       The iterate function.
+   * @param  Boolean  backward Whether to use backward iteration.
+   * @return void
+   */
+  _forEachNode: function(nodeList, fn, backward) {
+    Array.prototype.forEach.call(nodeList, fn, this);
+  },
+
+  /**
+   * Iterate over a NodeList, return true if any of the provided iterate
+   * function calls returns true, false otherwise.
+   *
+   * For convenience, the current object context is applied to the
+   * provided iterate function.
+   *
+   * @param  NodeList nodeList The NodeList.
+   * @param  Function fn       The iterate function.
+   * @return Boolean
+   */
+  _someNode: function(nodeList, fn) {
+    return Array.prototype.some.call(nodeList, fn, this);
+  },
+
+  /**
+   * Concat all nodelists passed as arguments.
+   *
+   * @return ...NodeList
+   * @return Array
+   */
+  _concatNodeLists: function() {
+    var slice = Array.prototype.slice;
+    var args = slice.call(arguments);
+    var nodeLists = args.map(function(list) {
+      return slice.call(list);
+    });
+    return Array.prototype.concat.apply([], nodeLists);
+  },
+
+  _getAllNodesWithTag: function(node, tagNames) {
+    if (node.querySelectorAll) {
+      return node.querySelectorAll(tagNames.join(','));
+    }
+    return [].concat.apply([], tagNames.map(function(tag) {
+      var collection = node.getElementsByTagName(tag);
+      return Array.isArray(collection) ? collection : Array.from(collection);
+    }));
+  },
+
+  /**
+   * Converts each <a> and <img> uri in the given element to an absolute URI,
+   * ignoring #ref URIs.
+   *
+   * @param Element
+   * @return void
+   */
+  _fixRelativeUris: function(articleContent) {
+    var scheme = this._uri.scheme;
+    var prePath = this._uri.prePath;
+    var pathBase = this._uri.pathBase;
+
+    function toAbsoluteURI(uri) {
+      // If this is already an absolute URI, return it.
+      if (/^[a-zA-Z][a-zA-Z0-9\+\-\.]*:/.test(uri))
+        return uri;
+
+      // Scheme-rooted relative URI.
+      if (uri.substr(0, 2) == "//")
+        return scheme + "://" + uri.substr(2);
+
+      // Prepath-rooted relative URI.
+      if (uri[0] == "/")
+        return prePath + uri;
+
+      // Dotslash relative URI.
+      if (uri.indexOf("./") === 0)
+        return pathBase + uri.slice(2);
+
+      // Ignore hash URIs:
+      if (uri[0] == "#")
+        return uri;
+
+      // Standard relative URI; add entire path. pathBase already includes a
+      // trailing "/".
+      return pathBase + uri;
+    }
+
+    var links = articleContent.getElementsByTagName("a");
+    this._forEachNode(links, function(link) {
+      var href = link.getAttribute("href");
+      if (href) {
+        // Replace links with javascript: URIs with text content, since
+        // they won't work after scripts have been removed from the page.
+        if (href.indexOf("javascript:") === 0) {
+          var text = this._doc.createTextNode(link.textContent);
+          link.parentNode.replaceChild(text, link);
+        } else {
+          link.setAttribute("href", toAbsoluteURI(href));
+        }
+      }
+    });
+
+    var imgs = articleContent.getElementsByTagName("img");
+    this._forEachNode(imgs, function(img) {
+      var src = img.getAttribute("src");
+      if (src) {
+        img.setAttribute("src", toAbsoluteURI(src));
+      }
+    });
+  },
+
+  /**
+   * Get the article title as an H1.
+   *
+   * @return void
+   **/
+  _getArticleTitle: function() {
+    var doc = this._doc;
+    var curTitle = "";
+    var origTitle = "";
+
+    try {
+      curTitle = origTitle = doc.title;
+
+      // If they had an element with id "title" in their HTML
+      if (typeof curTitle !== "string")
+        curTitle = origTitle = this._getInnerText(doc.getElementsByTagName('title')[0]);
+    } catch (e) {/* ignore exceptions setting the title. */}
+
+    if (curTitle.match(/ [\|\-] /)) {
+      curTitle = origTitle.replace(/(.*)[\|\-] .*/gi, '$1');
+
+      if (curTitle.split(' ').length < 3)
+        curTitle = origTitle.replace(/[^\|\-]*[\|\-](.*)/gi, '$1');
+    } else if (curTitle.indexOf(': ') !== -1) {
+      // Check if we have an heading containing this exact string, so we
+      // could assume it's the full title.
+      var headings = this._concatNodeLists(
+        doc.getElementsByTagName('h1'),
+        doc.getElementsByTagName('h2')
+      );
+      var match = this._someNode(headings, function(heading) {
+        return heading.textContent === curTitle;
+      });
+
+      // If we don't, let's extract the title out of the original title string.
+      if (!match) {
+        curTitle = origTitle.substring(origTitle.lastIndexOf(':') + 1);
+
+        // If the title is now too short, try the first colon instead:
+        if (curTitle.split(' ').length < 3)
+          curTitle = origTitle.substring(origTitle.indexOf(':') + 1);
+      }
+    } else if (curTitle.length > 150 || curTitle.length < 15) {
+      var hOnes = doc.getElementsByTagName('h1');
+
+      if (hOnes.length === 1)
+        curTitle = this._getInnerText(hOnes[0]);
+    }
+
+    curTitle = curTitle.trim();
+
+    if (curTitle.split(' ').length <= 4)
+      curTitle = origTitle;
+
+    return curTitle;
+  },
+
+  /**
+   * Prepare the HTML document for readability to scrape it.
+   * This includes things like stripping javascript, CSS, and handling terrible markup.
+   *
+   * @return void
+   **/
+  _prepDocument: function() {
+    var doc = this._doc;
+
+    // Remove all style tags in head
+    this._removeNodes(doc.getElementsByTagName("style"));
+
+    if (doc.body) {
+      this._replaceBrs(doc.body);
+    }
+
+    this._forEachNode(doc.getElementsByTagName("font"), function(fontNode) {
+      this._setNodeTag(fontNode, "SPAN");
+    });
+  },
+
+  /**
+   * Finds the next element, starting from the given node, and ignoring
+   * whitespace in between. If the given node is an element, the same node is
+   * returned.
+   */
+  _nextElement: function (node) {
+    var next = node;
+    while (next
+        && (next.nodeType != Node.ELEMENT_NODE)
+        && this.REGEXPS.whitespace.test(next.textContent)) {
+      next = next.nextSibling;
+    }
+    return next;
+  },
+
+  /**
+   * Replaces 2 or more successive <br> elements with a single <p>.
+   * Whitespace between <br> elements are ignored. For example:
+   *   <div>foo<br>bar<br> <br><br>abc</div>
+   * will become:
+   *   <div>foo<br>bar<p>abc</p></div>
+   */
+  _replaceBrs: function (elem) {
+    this._forEachNode(this._getAllNodesWithTag(elem, ["br"]), function(br) {
+      var next = br.nextSibling;
+
+      // Whether 2 or more <br> elements have been found and replaced with a
+      // <p> block.
+      var replaced = false;
+
+      // If we find a <br> chain, remove the <br>s until we hit another element
+      // or non-whitespace. This leaves behind the first <br> in the chain
+      // (which will be replaced with a <p> later).
+      while ((next = this._nextElement(next)) && (next.tagName == "BR")) {
+        replaced = true;
+        var brSibling = next.nextSibling;
+        next.parentNode.removeChild(next);
+        next = brSibling;
+      }
+
+      // If we removed a <br> chain, replace the remaining <br> with a <p>. Add
+      // all sibling nodes as children of the <p> until we hit another <br>
+      // chain.
+      if (replaced) {
+        var p = this._doc.createElement("p");
+        br.parentNode.replaceChild(p, br);
+
+        next = p.nextSibling;
+        while (next) {
+          // If we've hit another <br><br>, we're done adding children to this <p>.
+          if (next.tagName == "BR") {
+            var nextElem = this._nextElement(next);
+            if (nextElem && nextElem.tagName == "BR")
+              break;
+          }
+
+          // Otherwise, make this node a child of the new <p>.
+          var sibling = next.nextSibling;
+          p.appendChild(next);
+          next = sibling;
+        }
+      }
+    });
+  },
+
+  _setNodeTag: function (node, tag) {
+    this.log("_setNodeTag", node, tag);
+    if (node.__JSDOMParser__) {
+      node.localName = tag.toLowerCase();
+      node.tagName = tag.toUpperCase();
+      return node;
+    }
+
+    var replacement = node.ownerDocument.createElement(tag);
+    while (node.firstChild) {
+      replacement.appendChild(node.firstChild);
+    }
+    node.parentNode.replaceChild(replacement, node);
+    if (node.readability)
+      replacement.readability = node.readability;
+
+    for (var i = 0; i < node.attributes.length; i++) {
+      replacement.setAttribute(node.attributes[i].name, node.attributes[i].value);
+    }
+    return replacement;
+  },
+
+  /**
+   * Prepare the article node for display. Clean out any inline styles,
+   * iframes, forms, strip extraneous <p> tags, etc.
+   *
+   * @param Element
+   * @return void
+   **/
+  _prepArticle: function(articleContent) {
+    this._cleanStyles(articleContent);
+
+    // Clean out junk from the article content
+    this._cleanConditionally(articleContent, "form");
+    this._clean(articleContent, "object");
+    this._clean(articleContent, "embed");
+    this._clean(articleContent, "h1");
+    this._clean(articleContent, "footer");
+
+    // If there is only one h2, they are probably using it as a header
+    // and not a subheader, so remove it since we already have a header.
+    if (articleContent.getElementsByTagName('h2').length === 1)
+      this._clean(articleContent, "h2");
+
+    this._clean(articleContent, "iframe");
+    this._cleanHeaders(articleContent);
+
+    // Do these last as the previous stuff may have removed junk
+    // that will affect these
+    this._cleanConditionally(articleContent, "table");
+    this._cleanConditionally(articleContent, "ul");
+    this._cleanConditionally(articleContent, "div");
+
+    // Remove extra paragraphs
+    this._removeNodes(articleContent.getElementsByTagName('p'), function (paragraph) {
+      var imgCount = paragraph.getElementsByTagName('img').length;
+      var embedCount = paragraph.getElementsByTagName('embed').length;
+      var objectCount = paragraph.getElementsByTagName('object').length;
+      // At this point, nasty iframes have been removed, only remain embedded video ones.
+      var iframeCount = paragraph.getElementsByTagName('iframe').length;
+      var totalCount = imgCount + embedCount + objectCount + iframeCount;
+
+      return totalCount === 0 && !this._getInnerText(paragraph, false);
+    });
+
+    this._forEachNode(this._getAllNodesWithTag(articleContent, ["br"]), function(br) {
+      var next = this._nextElement(br.nextSibling);
+      if (next && next.tagName == "P")
+        br.parentNode.removeChild(br);
+    });
+  },
+
+  /**
+   * Initialize a node with the readability object. Also checks the
+   * className/id for special names to add to its score.
+   *
+   * @param Element
+   * @return void
+  **/
+  _initializeNode: function(node) {
+    node.readability = {"contentScore": 0};
+
+    switch (node.tagName) {
+      case 'DIV':
+        node.readability.contentScore += 5;
+        break;
+
+      case 'PRE':
+      case 'TD':
+      case 'BLOCKQUOTE':
+        node.readability.contentScore += 3;
+        break;
+
+      case 'ADDRESS':
+      case 'OL':
+      case 'UL':
+      case 'DL':
+      case 'DD':
+      case 'DT':
+      case 'LI':
+      case 'FORM':
+        node.readability.contentScore -= 3;
+        break;
+
+      case 'H1':
+      case 'H2':
+      case 'H3':
+      case 'H4':
+      case 'H5':
+      case 'H6':
+      case 'TH':
+        node.readability.contentScore -= 5;
+        break;
+    }
+
+    node.readability.contentScore += this._getClassWeight(node);
+  },
+
+  _removeAndGetNext: function(node) {
+    var nextNode = this._getNextNode(node, true);
+    node.parentNode.removeChild(node);
+    return nextNode;
+  },
+
+  /**
+   * Traverse the DOM from node to node, starting at the node passed in.
+   * Pass true for the second parameter to indicate this node itself
+   * (and its kids) are going away, and we want the next node over.
+   *
+   * Calling this in a loop will traverse the DOM depth-first.
+   */
+  _getNextNode: function(node, ignoreSelfAndKids) {
+    // First check for kids if those aren't being ignored
+    if (!ignoreSelfAndKids && node.firstElementChild) {
+      return node.firstElementChild;
+    }
+    // Then for siblings...
+    if (node.nextElementSibling) {
+      return node.nextElementSibling;
+    }
+    // And finally, move up the parent chain *and* find a sibling
+    // (because this is depth-first traversal, we will have already
+    // seen the parent nodes themselves).
+    do {
+      node = node.parentNode;
+    } while (node && !node.nextElementSibling);
+    return node && node.nextElementSibling;
+  },
+
+  /**
+   * Like _getNextNode, but for DOM implementations with no
+   * firstElementChild/nextElementSibling functionality...
+   */
+  _getNextNodeNoElementProperties: function(node, ignoreSelfAndKids) {
+    function nextSiblingEl(n) {
+      do {
+        n = n.nextSibling;
+      } while (n && n.nodeType !== n.ELEMENT_NODE);
+      return n;
+    }
+    // First check for kids if those aren't being ignored
+    if (!ignoreSelfAndKids && node.children[0]) {
+      return node.children[0];
+    }
+    // Then for siblings...
+    var next = nextSiblingEl(node);
+    if (next) {
+      return next;
+    }
+    // And finally, move up the parent chain *and* find a sibling
+    // (because this is depth-first traversal, we will have already
+    // seen the parent nodes themselves).
+    do {
+      node = node.parentNode;
+      if (node)
+        next = nextSiblingEl(node);
+    } while (node && !next);
+    return node && next;
+  },
+
+  _checkByline: function(node, matchString) {
+    if (this._articleByline) {
+      return false;
+    }
+
+    if (node.getAttribute !== undefined) {
+      var rel = node.getAttribute("rel");
+    }
+
+    if ((rel === "author" || this.REGEXPS.byline.test(matchString)) && this._isValidByline(node.textContent)) {
+      this._articleByline = node.textContent.trim();
+      return true;
+    }
+
+    return false;
+  },
+
+  _getNodeAncestors: function(node, maxDepth) {
+    maxDepth = maxDepth || 0;
+    var i = 0, ancestors = [];
+    while (node.parentNode) {
+      ancestors.push(node.parentNode);
+      if (maxDepth && ++i === maxDepth)
+        break;
+      node = node.parentNode;
+    }
+    return ancestors;
+  },
+
+  /***
+   * grabArticle - Using a variety of metrics (content score, classname, element types), find the content that is
+   *         most likely to be the stuff a user wants to read. Then return it wrapped up in a div.
+   *
+   * @param page a document to run upon. Needs to be a full document, complete with body.
+   * @return Element
+  **/
+  _grabArticle: function (page) {
+    this.log("**** grabArticle ****");
+    var doc = this._doc;
+    var isPaging = (page !== null ? true: false);
+    page = page ? page : this._doc.body;
+
+    // We can't grab an article if we don't have a page!
+    if (!page) {
+      this.log("No body found in document. Abort.");
+      return null;
+    }
+
+    var pageCacheHtml = page.innerHTML;
+
+    // Check if any "dir" is set on the toplevel document element
+    this._articleDir = doc.documentElement.getAttribute("dir");
+
+    while (true) {
+      var stripUnlikelyCandidates = this._flagIsActive(this.FLAG_STRIP_UNLIKELYS);
+
+      // First, node prepping. Trash nodes that look cruddy (like ones with the
+      // class name "comment", etc), and turn divs into P tags where they have been
+      // used inappropriately (as in, where they contain no other block level elements.)
+      var elementsToScore = [];
+      var node = this._doc.documentElement;
+
+      while (node) {
+        var matchString = node.className + " " + node.id;
+
+        // Check to see if this node is a byline, and remove it if it is.
+        if (this._checkByline(node, matchString)) {
+          node = this._removeAndGetNext(node);
+          continue;
+        }
+
+        // Remove unlikely candidates
+        if (stripUnlikelyCandidates) {
+          if (this.REGEXPS.unlikelyCandidates.test(matchString) &&
+              !this.REGEXPS.okMaybeItsACandidate.test(matchString) &&
+              node.tagName !== "BODY" &&
+              node.tagName !== "A") {
+            this.log("Removing unlikely candidate - " + matchString);
+            node = this._removeAndGetNext(node);
+            continue;
+          }
+        }
+
+        if (this.DEFAULT_TAGS_TO_SCORE.indexOf(node.tagName) !== -1) {
+          elementsToScore.push(node);
+        }
+
+        // Turn all divs that don't have children block level elements into p's
+        if (node.tagName === "DIV") {
+          // Sites like http://mobile.slate.com encloses each paragraph with a DIV
+          // element. DIVs with only a P element inside and no text content can be
+          // safely converted into plain P elements to avoid confusing the scoring
+          // algorithm with DIVs with are, in practice, paragraphs.
+          if (this._hasSinglePInsideElement(node)) {
+            var newNode = node.children[0];
+            node.parentNode.replaceChild(newNode, node);
+            node = newNode;
+          } else if (!this._hasChildBlockElement(node)) {
+            node = this._setNodeTag(node, "P");
+            elementsToScore.push(node);
+          } else {
+            // EXPERIMENTAL
+            this._forEachNode(node.childNodes, function(childNode) {
+              if (childNode.nodeType === Node.TEXT_NODE) {
+                var p = doc.createElement('p');
+                p.textContent = childNode.textContent;
+                p.style.display = 'inline';
+                p.className = 'readability-styled';
+                node.replaceChild(p, childNode);
+              }
+            });
+          }
+        }
+        node = this._getNextNode(node);
+      }
+
+      /**
+       * Loop through all paragraphs, and assign a score to them based on how content-y they look.
+       * Then add their score to their parent node.
+       *
+       * A score is determined by things like number of commas, class names, etc. Maybe eventually link density.
+      **/
+      var candidates = [];
+      this._forEachNode(elementsToScore, function(elementToScore) {
+        if (!elementToScore.parentNode || typeof(elementToScore.parentNode.tagName) === 'undefined')
+          return;
+
+        // If this paragraph is less than 25 characters, don't even count it.
+        var innerText = this._getInnerText(elementToScore);
+        if (innerText.length < 25)
+          return;
+
+        // Exclude nodes with no ancestor.
+        var ancestors = this._getNodeAncestors(elementToScore, 3);
+        if (ancestors.length === 0)
+          return;
+
+        var contentScore = 0;
+
+        // Add a point for the paragraph itself as a base.
+        contentScore += 1;
+
+        // Add points for any commas within this paragraph.
+        contentScore += innerText.split(',').length;
+
+        // For every 100 characters in this paragraph, add another point. Up to 3 points.
+        contentScore += Math.min(Math.floor(innerText.length / 100), 3);
+
+        // Initialize and score ancestors.
+        this._forEachNode(ancestors, function(ancestor, level) {
+          if (!ancestor.tagName)
+            return;
+
+          if (typeof(ancestor.readability) === 'undefined') {
+            this._initializeNode(ancestor);
+            candidates.push(ancestor);
+          }
+
+          // Node score divider:
+          // - parent:             1 (no division)
+          // - grandparent:        2
+          // - great grandparent+: ancestor level * 3
+          if (level === 0)
+            var scoreDivider = 1;
+          else if (level === 1)
+            scoreDivider = 2;
+          else
+            scoreDivider = level * 3;
+          ancestor.readability.contentScore += contentScore / scoreDivider;
+        });
+      });
+
+      // After we've calculated scores, loop through all of the possible
+      // candidate nodes we found and find the one with the highest score.
+      var topCandidates = [];
+      for (var c = 0, cl = candidates.length; c < cl; c += 1) {
+        var candidate = candidates[c];
+
+        // Scale the final candidates score based on link density. Good content
+        // should have a relatively small link density (5% or less) and be mostly
+        // unaffected by this operation.
+        var candidateScore = candidate.readability.contentScore * (1 - this._getLinkDensity(candidate));
+        candidate.readability.contentScore = candidateScore;
+
+        this.log('Candidate:', candidate, "with score " + candidateScore);
+
+        for (var t = 0; t < this._nbTopCandidates; t++) {
+          var aTopCandidate = topCandidates[t];
+
+          if (!aTopCandidate || candidateScore > aTopCandidate.readability.contentScore) {
+            topCandidates.splice(t, 0, candidate);
+            if (topCandidates.length > this._nbTopCandidates)
+              topCandidates.pop();
+            break;
+          }
+        }
+      }
+
+      var topCandidate = topCandidates[0] || null;
+      var neededToCreateTopCandidate = false;
+
+      // If we still have no top candidate, just use the body as a last resort.
+      // We also have to copy the body node so it is something we can modify.
+      if (topCandidate === null || topCandidate.tagName === "BODY") {
+        // Move all of the page's children into topCandidate
+        topCandidate = doc.createElement("DIV");
+        neededToCreateTopCandidate = true;
+        // Move everything (not just elements, also text nodes etc.) into the container
+        // so we even include text directly in the body:
+        var kids = page.childNodes;
+        while (kids.length) {
+          this.log("Moving child out:", kids[0]);
+          topCandidate.appendChild(kids[0]);
+        }
+
+        page.appendChild(topCandidate);
+
+        this._initializeNode(topCandidate);
+      } else if (topCandidate) {
+        // Because of our bonus system, parents of candidates might have scores
+        // themselves. They get half of the node. There won't be nodes with higher
+        // scores than our topCandidate, but if we see the score going *up* in the first
+        // few steps up the tree, that's a decent sign that there might be more content
+        // lurking in other places that we want to unify in. The sibling stuff
+        // below does some of that - but only if we've looked high enough up the DOM
+        // tree.
+        var parentOfTopCandidate = topCandidate.parentNode;
+        var lastScore = topCandidate.readability.contentScore;
+        // The scores shouldn't get too low.
+        var scoreThreshold = lastScore / 3;
+        while (parentOfTopCandidate && parentOfTopCandidate.readability) {
+          var parentScore = parentOfTopCandidate.readability.contentScore;
+          if (parentScore < scoreThreshold)
+            break;
+          if (parentScore > lastScore) {
+            // Alright! We found a better parent to use.
+            topCandidate = parentOfTopCandidate;
+            break;
+          }
+          lastScore = parentOfTopCandidate.readability.contentScore;
+          parentOfTopCandidate = parentOfTopCandidate.parentNode;
+        }
+      }
+
+      // Now that we have the top candidate, look through its siblings for content
+      // that might also be related. Things like preambles, content split by ads
+      // that we removed, etc.
+      var articleContent = doc.createElement("DIV");
+      if (isPaging)
+        articleContent.id = "readability-content";
+
+      var siblingScoreThreshold = Math.max(10, topCandidate.readability.contentScore * 0.2);
+      var siblings = topCandidate.parentNode.children;
+
+      for (var s = 0, sl = siblings.length; s < sl; s++) {
+        var sibling = siblings[s];
+        var append = false;
+
+        this.log("Looking at sibling node:", sibling, sibling.readability ? ("with score " + sibling.readability.contentScore) : '');
+        this.log("Sibling has score", sibling.readability ? sibling.readability.contentScore : 'Unknown');
+
+        if (sibling === topCandidate) {
+          append = true;
+        } else {
+          var contentBonus = 0;
+
+          // Give a bonus if sibling nodes and top candidates have the example same classname
+          if (sibling.className === topCandidate.className && topCandidate.className !== "")
+            contentBonus += topCandidate.readability.contentScore * 0.2;
+
+          if (sibling.readability &&
+              ((sibling.readability.contentScore + contentBonus) >= siblingScoreThreshold)) {
+            append = true;
+          } else if (sibling.nodeName === "P") {
+            var linkDensity = this._getLinkDensity(sibling);
+            var nodeContent = this._getInnerText(sibling);
+            var nodeLength = nodeContent.length;
+
+            if (nodeLength > 80 && linkDensity < 0.25) {
+              append = true;
+            } else if (nodeLength < 80 && nodeLength > 0 && linkDensity === 0 &&
+                       nodeContent.search(/\.( |$)/) !== -1) {
+              append = true;
+            }
+          }
+        }
+
+        if (append) {
+          this.log("Appending node:", sibling);
+
+          if (this.ALTER_TO_DIV_EXCEPTIONS.indexOf(sibling.nodeName) === -1) {
+            // We have a node that isn't a common block level element, like a form or td tag.
+            // Turn it into a div so it doesn't get filtered out later by accident.
+            this.log("Altering sibling:", sibling, 'to div.');
+
+            sibling = this._setNodeTag(sibling, "DIV");
+          }
+
+          articleContent.appendChild(sibling);
+          // siblings is a reference to the children array, and
+          // sibling is removed from the array when we call appendChild().
+          // As a result, we must revisit this index since the nodes
+          // have been shifted.
+          s -= 1;
+          sl -= 1;
+        }
+      }
+
+      if (this._debug)
+        this.log("Article content pre-prep: " + articleContent.innerHTML);
+      // So we have all of the content that we need. Now we clean it up for presentation.
+      this._prepArticle(articleContent);
+      if (this._debug)
+        this.log("Article content post-prep: " + articleContent.innerHTML);
+
+      if (this._curPageNum === 1) {
+        if (neededToCreateTopCandidate) {
+          // We already created a fake div thing, and there wouldn't have been any siblings left
+          // for the previous loop, so there's no point trying to create a new div, and then
+          // move all the children over. Just assign IDs and class names here. No need to append
+          // because that already happened anyway.
+          topCandidate.id = "readability-page-1";
+          topCandidate.className = "page";
+        } else {
+          var div = doc.createElement("DIV");
+          div.id = "readability-page-1";
+          div.className = "page";
+          var children = articleContent.childNodes;
+          while (children.length) {
+            div.appendChild(children[0]);
+          }
+          articleContent.appendChild(div);
+        }
+      }
+
+      if (this._debug)
+        this.log("Article content after paging: " + articleContent.innerHTML);
+
+      // Now that we've gone through the full algorithm, check to see if
+      // we got any meaningful content. If we didn't, we may need to re-run
+      // grabArticle with different flags set. This gives us a higher likelihood of
+      // finding the content, and the sieve approach gives us a higher likelihood of
+      // finding the -right- content.
+      if (this._getInnerText(articleContent, true).length < 500) {
+        page.innerHTML = pageCacheHtml;
+
+        if (this._flagIsActive(this.FLAG_STRIP_UNLIKELYS)) {
+          this._removeFlag(this.FLAG_STRIP_UNLIKELYS);
+        } else if (this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) {
+          this._removeFlag(this.FLAG_WEIGHT_CLASSES);
+        } else if (this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) {
+          this._removeFlag(this.FLAG_CLEAN_CONDITIONALLY);
+        } else {
+          return null;
+        }
+      } else {
+        return articleContent;
+      }
+    }
+  },
+
+  /**
+   * Check whether the input string could be a byline.
+   * This verifies that the input is a string, and that the length
+   * is less than 100 chars.
+   *
+   * @param possibleByline {string} - a string to check whether its a byline.
+   * @return Boolean - whether the input string is a byline.
+   */
+  _isValidByline: function(byline) {
+    if (typeof byline == 'string' || byline instanceof String) {
+      byline = byline.trim();
+      return (byline.length > 0) && (byline.length < 100);
+    }
+    return false;
+  },
+
+  /**
+   * Attempts to get excerpt and byline metadata for the article.
+   *
+   * @return Object with optional "excerpt" and "byline" properties
+   */
+  _getArticleMetadata: function() {
+    var metadata = {};
+    var values = {};
+    var metaElements = this._doc.getElementsByTagName("meta");
+
+    // Match "description", or Twitter's "twitter:description" (Cards)
+    // in name attribute.
+    var namePattern = /^\s*((twitter)\s*:\s*)?(description|title)\s*$/gi;
+
+    // Match Facebook's Open Graph title & description properties.
+    var propertyPattern = /^\s*og\s*:\s*(description|title)\s*$/gi;
+
+    // Find description tags.
+    this._forEachNode(metaElements, function(element) {
+      var elementName = element.getAttribute("name");
+      var elementProperty = element.getAttribute("property");
+
+      if ([elementName, elementProperty].indexOf("author") !== -1) {
+        metadata.byline = element.getAttribute("content");
+        return;
+      }
+
+      var name = null;
+      if (namePattern.test(elementName)) {
+        name = elementName;
+      } else if (propertyPattern.test(elementProperty)) {
+        name = elementProperty;
+      }
+
+      if (name) {
+        var content = element.getAttribute("content");
+        if (content) {
+          // Convert to lowercase and remove any whitespace
+          // so we can match below.
+          name = name.toLowerCase().replace(/\s/g, '');
+          values[name] = content.trim();
+        }
+      }
+    });
+
+    if ("description" in values) {
+      metadata.excerpt = values["description"];
+    } else if ("og:description" in values) {
+      // Use facebook open graph description.
+      metadata.excerpt = values["og:description"];
+    } else if ("twitter:description" in values) {
+      // Use twitter cards description.
+      metadata.excerpt = values["twitter:description"];
+    }
+
+    if ("og:title" in values) {
+      // Use facebook open graph title.
+      metadata.title = values["og:title"];
+    } else if ("twitter:title" in values) {
+      // Use twitter cards title.
+      metadata.title = values["twitter:title"];
+    }
+
+    return metadata;
+  },
+
+  /**
+   * Removes script tags from the document.
+   *
+   * @param Element
+  **/
+  _removeScripts: function(doc) {
+    this._removeNodes(doc.getElementsByTagName('script'), function(scriptNode) {
+      scriptNode.nodeValue = "";
+      scriptNode.removeAttribute('src');
+      return true;
+    });
+    this._removeNodes(doc.getElementsByTagName('noscript'));
+  },
+
+  /**
+   * Check if this node has only whitespace and a single P element
+   * Returns false if the DIV node contains non-empty text nodes
+   * or if it contains no P or more than 1 element.
+   *
+   * @param Element
+  **/
+  _hasSinglePInsideElement: function(element) {
+    // There should be exactly 1 element child which is a P:
+    if (element.children.length != 1 || element.children[0].tagName !== "P") {
+      return false;
+    }
+
+    // And there should be no text nodes with real content
+    return !this._someNode(element.childNodes, function(node) {
+      return node.nodeType === Node.TEXT_NODE &&
+             this.REGEXPS.hasContent.test(node.textContent);
+    });
+  },
+
+  /**
+   * Determine whether element has any children block level elements.
+   *
+   * @param Element
+   */
+  _hasChildBlockElement: function (element) {
+    return this._someNode(element.childNodes, function(node) {
+      return this.DIV_TO_P_ELEMS.indexOf(node.tagName) !== -1 ||
+             this._hasChildBlockElement(node);
+    });
+  },
+
+  /**
+   * Get the inner text of a node - cross browser compatibly.
+   * This also strips out any excess whitespace to be found.
+   *
+   * @param Element
+   * @param Boolean normalizeSpaces (default: true)
+   * @return string
+  **/
+  _getInnerText: function(e, normalizeSpaces) {
+    normalizeSpaces = (typeof normalizeSpaces === 'undefined') ? true : normalizeSpaces;
+    var textContent = e.textContent.trim();
+
+    if (normalizeSpaces) {
+      return textContent.replace(this.REGEXPS.normalize, " ");
+    }
+    return textContent;
+  },
+
+  /**
+   * Get the number of times a string s appears in the node e.
+   *
+   * @param Element
+   * @param string - what to split on. Default is ","
+   * @return number (integer)
+  **/
+  _getCharCount: function(e, s) {
+    s = s || ",";
+    return this._getInnerText(e).split(s).length - 1;
+  },
+
+  /**
+   * Remove the style attribute on every e and under.
+   * TODO: Test if getElementsByTagName(*) is faster.
+   *
+   * @param Element
+   * @return void
+  **/
+  _cleanStyles: function(e) {
+    e = e || this._doc;
+    if (!e)
+      return;
+    var cur = e.firstChild;
+
+    // Remove any root styles, if we're able.
+    if (typeof e.removeAttribute === 'function' && e.className !== 'readability-styled')
+      e.removeAttribute('style');
+
+    // Go until there are no more child nodes
+    while (cur !== null) {
+      if (cur.nodeType === cur.ELEMENT_NODE) {
+        // Remove style attribute(s) :
+        if (cur.className !== "readability-styled")
+          cur.removeAttribute("style");
+
+        this._cleanStyles(cur);
+      }
+
+      cur = cur.nextSibling;
+    }
+  },
+
+  /**
+   * Get the density of links as a percentage of the content
+   * This is the amount of text that is inside a link divided by the total text in the node.
+   *
+   * @param Element
+   * @return number (float)
+  **/
+  _getLinkDensity: function(element) {
+    var textLength = this._getInnerText(element).length;
+    if (textLength === 0)
+      return 0;
+
+    var linkLength = 0;
+
+    // XXX implement _reduceNodeList?
+    this._forEachNode(element.getElementsByTagName("a"), function(linkNode) {
+      linkLength += this._getInnerText(linkNode).length;
+    });
+
+    return linkLength / textLength;
+  },
+
+  /**
+   * Find a cleaned up version of the current URL, to use for comparing links for possible next-pageyness.
+   *
+   * @author Dan Lacy
+   * @return string the base url
+  **/
+  _findBaseUrl: function() {
+    var uri = this._uri;
+    var noUrlParams = uri.path.split("?")[0];
+    var urlSlashes = noUrlParams.split("/").reverse();
+    var cleanedSegments = [];
+    var possibleType = "";
+
+    for (var i = 0, slashLen = urlSlashes.length; i < slashLen; i += 1) {
+      var segment = urlSlashes[i];
+
+      // Split off and save anything that looks like a file type.
+      if (segment.indexOf(".") !== -1) {
+        possibleType = segment.split(".")[1];
+
+        // If the type isn't alpha-only, it's probably not actually a file extension.
+        if (!possibleType.match(/[^a-zA-Z]/))
+          segment = segment.split(".")[0];
+      }
+
+      // EW-CMS specific segment replacement. Ugly.
+      // Example: http://www.ew.com/ew/article/0,,20313460_20369436,00.html
+      if (segment.indexOf(',00') !== -1)
+        segment = segment.replace(',00', '');
+
+      // If our first or second segment has anything looking like a page number, remove it.
+      if (segment.match(/((_|-)?p[a-z]*|(_|-))[0-9]{1,2}$/i) && ((i === 1) || (i === 0)))
+        segment = segment.replace(/((_|-)?p[a-z]*|(_|-))[0-9]{1,2}$/i, "");
+
+      var del = false;
+
+      // If this is purely a number, and it's the first or second segment,
+      // it's probably a page number. Remove it.
+      if (i < 2 && segment.match(/^\d{1,2}$/))
+        del = true;
+
+      // If this is the first segment and it's just "index", remove it.
+      if (i === 0 && segment.toLowerCase() === "index")
+        del = true;
+
+      // If our first or second segment is smaller than 3 characters,
+      // and the first segment was purely alphas, remove it.
+      if (i < 2 && segment.length < 3 && !urlSlashes[0].match(/[a-z]/i))
+        del = true;
+
+      // If it's not marked for deletion, push it to cleanedSegments.
+      if (!del)
+        cleanedSegments.push(segment);
+    }
+
+    // This is our final, cleaned, base article URL.
+    return uri.scheme + "://" + uri.host + cleanedSegments.reverse().join("/");
+  },
+
+  /**
+   * Look for any paging links that may occur within the document.
+   *
+   * @param body
+   * @return object (array)
+  **/
+  _findNextPageLink: function(elem) {
+    var uri = this._uri;
+    var possiblePages = {};
+    var allLinks = elem.getElementsByTagName('a');
+    var articleBaseUrl = this._findBaseUrl();
+
+    // Loop through all links, looking for hints that they may be next-page links.
+    // Things like having "page" in their textContent, className or id, or being a child
+    // of a node with a page-y className or id.
+    //
+    // Also possible: levenshtein distance? longest common subsequence?
+    //
+    // After we do that, assign each page a score, and
+    for (var i = 0, il = allLinks.length; i < il; i += 1) {
+      var link = allLinks[i];
+      var linkHref = allLinks[i].href.replace(/#.*$/, '').replace(/\/$/, '');
+
+      // If we've already seen this page, ignore it.
+      if (linkHref === "" ||
+        linkHref === articleBaseUrl ||
+        linkHref === uri.spec ||
+        linkHref in this._parsedPages) {
+        continue;
+      }
+
+      // If it's on a different domain, skip it.
+      if (uri.host !== linkHref.split(/\/+/g)[1])
+        continue;
+
+      var linkText = this._getInnerText(link);
+
+      // If the linkText looks like it's not the next page, skip it.
+      if (linkText.match(this.REGEXPS.extraneous) || linkText.length > 25)
+        continue;
+
+      // If the leftovers of the URL after removing the base URL don't contain
+      // any digits, it's certainly not a next page link.
+      var linkHrefLeftover = linkHref.replace(articleBaseUrl, '');
+      if (!linkHrefLeftover.match(/\d/))
+        continue;
+
+      if (!(linkHref in possiblePages)) {
+        possiblePages[linkHref] = {"score": 0, "linkText": linkText, "href": linkHref};
+      } else {
+        possiblePages[linkHref].linkText += ' | ' + linkText;
+      }
+
+      var linkObj = possiblePages[linkHref];
+
+      // If the articleBaseUrl isn't part of this URL, penalize this link. It could
+      // still be the link, but the odds are lower.
+      // Example: http://www.actionscript.org/resources/articles/745/1/JavaScript-and-VBScript-Injection-in-ActionScript-3/Page1.html
+      if (linkHref.indexOf(articleBaseUrl) !== 0)
+        linkObj.score -= 25;
+
+      var linkData = linkText + ' ' + link.className + ' ' + link.id;
+      if (linkData.match(this.REGEXPS.nextLink))
+        linkObj.score += 50;
+
+      if (linkData.match(/pag(e|ing|inat)/i))
+        linkObj.score += 25;
+
+      if (linkData.match(/(first|last)/i)) {
+        // -65 is enough to negate any bonuses gotten from a > or » in the text,
+        // If we already matched on "next", last is probably fine.
+        // If we didn't, then it's bad. Penalize.
+        if (!linkObj.linkText.match(this.REGEXPS.nextLink))
+          linkObj.score -= 65;
+      }
+
+      if (linkData.match(this.REGEXPS.negative) || linkData.match(this.REGEXPS.extraneous))
+        linkObj.score -= 50;
+
+      if (linkData.match(this.REGEXPS.prevLink))
+        linkObj.score -= 200;
+
+      // If a parentNode contains page or paging or paginat
+      var parentNode = link.parentNode;
+      var positiveNodeMatch = false;
+      var negativeNodeMatch = false;
+
+      while (parentNode) {
+        var parentNodeClassAndId = parentNode.className + ' ' + parentNode.id;
+
+        if (!positiveNodeMatch && parentNodeClassAndId && parentNodeClassAndId.match(/pag(e|ing|inat)/i)) {
+          positiveNodeMatch = true;
+          linkObj.score += 25;
+        }
+
+        if (!negativeNodeMatch && parentNodeClassAndId && parentNodeClassAndId.match(this.REGEXPS.negative)) {
+          // If this is just something like "footer", give it a negative.
+          // If it's something like "body-and-footer", leave it be.
+          if (!parentNodeClassAndId.match(this.REGEXPS.positive)) {
+            linkObj.score -= 25;
+            negativeNodeMatch = true;
+          }
+        }
+
+        parentNode = parentNode.parentNode;
+      }
+
+      // If the URL looks like it has paging in it, add to the score.
+      // Things like /page/2/, /pagenum/2, ?p=3, ?page=11, ?pagination=34
+      if (linkHref.match(/p(a|g|ag)?(e|ing|ination)?(=|\/)[0-9]{1,2}/i) || linkHref.match(/(page|paging)/i))
+        linkObj.score += 25;
+
+      // If the URL contains negative values, give a slight decrease.
+      if (linkHref.match(this.REGEXPS.extraneous))
+        linkObj.score -= 15;
+
+      /**
+       * Minor punishment to anything that doesn't match our current URL.
+       * NOTE: I'm finding this to cause more harm than good where something is exactly 50 points.
+       *     Dan, can you show me a counterexample where this is necessary?
+       * if (linkHref.indexOf(window.location.href) !== 0) {
+       *  linkObj.score -= 1;
+       * }
+      **/
+
+      // If the link text can be parsed as a number, give it a minor bonus, with a slight
+      // bias towards lower numbered pages. This is so that pages that might not have 'next'
+      // in their text can still get scored, and sorted properly by score.
+      var linkTextAsNumber = parseInt(linkText, 10);
+      if (linkTextAsNumber) {
+        // Punish 1 since we're either already there, or it's probably
+        // before what we want anyways.
+        if (linkTextAsNumber === 1) {
+          linkObj.score -= 10;
+        } else {
+          linkObj.score += Math.max(0, 10 - linkTextAsNumber);
+        }
+      }
+    }
+
+    // Loop thrugh all of our possible pages from above and find our top
+    // candidate for the next page URL. Require at least a score of 50, which
+    // is a relatively high confidence that this page is the next link.
+    var topPage = null;
+    for (var page in possiblePages) {
+      if (possiblePages.hasOwnProperty(page)) {
+        if (possiblePages[page].score >= 50 &&
+          (!topPage || topPage.score < possiblePages[page].score))
+          topPage = possiblePages[page];
+      }
+    }
+
+    var nextHref = null;
+    if (topPage) {
+      nextHref = topPage.href.replace(/\/$/, '');
+
+      this.log('NEXT PAGE IS ' + nextHref);
+      this._parsedPages[nextHref] = true;
+    }
+    return nextHref;
+  },
+
+  _successfulRequest: function(request) {
+    return (request.status >= 200 && request.status < 300) ||
+        request.status === 304 ||
+         (request.status === 0 && request.responseText);
+  },
+
+  _ajax: function(url, options) {
+    var request = new XMLHttpRequest();
+
+    function respondToReadyState(readyState) {
+      if (request.readyState === 4) {
+        if (this._successfulRequest(request)) {
+          if (options.success)
+            options.success(request);
+        } else if (options.error) {
+          options.error(request);
+        }
+      }
+    }
+
+    if (typeof options === 'undefined')
+      options = {};
+
+    request.onreadystatechange = respondToReadyState;
+
+    request.open('get', url, true);
+    request.setRequestHeader('Accept', 'text/html');
+
+    try {
+      request.send(options.postBody);
+    } catch (e) {
+      if (options.error)
+        options.error();
+    }
+
+    return request;
+  },
+
+  _appendNextPage: function(nextPageLink) {
+    var doc = this._doc;
+    this._curPageNum += 1;
+
+    var articlePage = doc.createElement("DIV");
+    articlePage.id = 'readability-page-' + this._curPageNum;
+    articlePage.className = 'page';
+    articlePage.innerHTML = '<p class="page-separator" title="Page ' + this._curPageNum + '">&sect;</p>';
+
+    doc.getElementById("readability-content").appendChild(articlePage);
+
+    if (this._curPageNum > this._maxPages) {
+      var nextPageMarkup = "<div style='text-align: center'><a href='" + nextPageLink + "'>View Next Page</a></div>";
+      articlePage.innerHTML = articlePage.innerHTML + nextPageMarkup;
+      return;
+    }
+
+    // Now that we've built the article page DOM element, get the page content
+    // asynchronously and load the cleaned content into the div we created for it.
+    (function(pageUrl, thisPage) {
+      this._ajax(pageUrl, {
+        success: function(r) {
+
+          // First, check to see if we have a matching ETag in headers - if we do, this is a duplicate page.
+          var eTag = r.getResponseHeader('ETag');
+          if (eTag) {
+            if (eTag in this._pageETags) {
+              this.log("Exact duplicate page found via ETag. Aborting.");
+              articlePage.style.display = 'none';
+              return;
+            }
+            this._pageETags[eTag] = 1;
+          }
+
+          // TODO: this ends up doubling up page numbers on NYTimes articles. Need to generically parse those away.
+          var page = doc.createElement("DIV");
+
+          // Do some preprocessing to our HTML to make it ready for appending.
+          // - Remove any script tags. Swap and reswap newlines with a unicode
+          //   character because multiline regex doesn't work in javascript.
+          // - Turn any noscript tags into divs so that we can parse them. This
+          //   allows us to find any next page links hidden via javascript.
+          // - Turn all double br's into p's - was handled by prepDocument in the original view.
+          //   Maybe in the future abstract out prepDocument to work for both the original document
+          //   and AJAX-added pages.
+          var responseHtml = r.responseText.replace(/\n/g, '\uffff').replace(/<script.*?>.*?<\/script>/gi, '');
+          responseHtml = responseHtml.replace(/\n/g, '\uffff').replace(/<script.*?>.*?<\/script>/gi, '');
+          responseHtml = responseHtml.replace(/\uffff/g, '\n').replace(/<(\/?)noscript/gi, '<$1div');
+          responseHtml = responseHtml.replace(this.REGEXPS.replaceFonts, '<$1span>');
+
+          page.innerHTML = responseHtml;
+          this._replaceBrs(page);
+
+          // Reset all flags for the next page, as they will search through it and
+          // disable as necessary at the end of grabArticle.
+          this._flags = 0x1 | 0x2 | 0x4;
+
+          var secondNextPageLink = this._findNextPageLink(page);
+
+          // NOTE: if we end up supporting _appendNextPage(), we'll need to
+          // change this call to be async
+          var content = this._grabArticle(page);
+
+          if (!content) {
+            this.log("No content found in page to append. Aborting.");
+            return;
+          }
+
+          // Anti-duplicate mechanism. Essentially, get the first paragraph of our new page.
+          // Compare it against all of the the previous document's we've gotten. If the previous
+          // document contains exactly the innerHTML of this first paragraph, it's probably a duplicate.
+          var firstP = content.getElementsByTagName("P").length ? content.getElementsByTagName("P")[0] : null;
+          if (firstP && firstP.innerHTML.length > 100) {
+            for (var i = 1; i <= this._curPageNum; i += 1) {
+              var rPage = doc.getElementById('readability-page-' + i);
+              if (rPage && rPage.innerHTML.indexOf(firstP.innerHTML) !== -1) {
+                this.log('Duplicate of page ' + i + ' - skipping.');
+                articlePage.style.display = 'none';
+                this._parsedPages[pageUrl] = true;
+                return;
+              }
+            }
+          }
+
+          this._removeScripts(content);
+
+          thisPage.innerHTML = thisPage.innerHTML + content.innerHTML;
+
+          // After the page has rendered, post process the content. This delay is necessary because,
+          // in webkit at least, offsetWidth is not set in time to determine image width. We have to
+          // wait a little bit for reflow to finish before we can fix floating images.
+          setTimeout((function() {
+            this._postProcessContent(thisPage);
+          }).bind(this), 500);
+
+
+          if (secondNextPageLink)
+            this._appendNextPage(secondNextPageLink);
+        }
+      });
+    }).bind(this)(nextPageLink, articlePage);
+  },
+
+  /**
+   * Get an elements class/id weight. Uses regular expressions to tell if this
+   * element looks good or bad.
+   *
+   * @param Element
+   * @return number (Integer)
+  **/
+  _getClassWeight: function(e) {
+    if (!this._flagIsActive(this.FLAG_WEIGHT_CLASSES))
+      return 0;
+
+    var weight = 0;
+
+    // Look for a special classname
+    if (typeof(e.className) === 'string' && e.className !== '') {
+      if (this.REGEXPS.negative.test(e.className))
+        weight -= 25;
+
+      if (this.REGEXPS.positive.test(e.className))
+        weight += 25;
+    }
+
+    // Look for a special ID
+    if (typeof(e.id) === 'string' && e.id !== '') {
+      if (this.REGEXPS.negative.test(e.id))
+        weight -= 25;
+
+      if (this.REGEXPS.positive.test(e.id))
+        weight += 25;
+    }
+
+    return weight;
+  },
+
+  /**
+   * Clean a node of all elements of type "tag".
+   * (Unless it's a youtube/vimeo video. People love movies.)
+   *
+   * @param Element
+   * @param string tag to clean
+   * @return void
+   **/
+  _clean: function(e, tag) {
+    var isEmbed = ["object", "embed", "iframe"].indexOf(tag) !== -1;
+
+    this._removeNodes(e.getElementsByTagName(tag), function(element) {
+      // Allow youtube and vimeo videos through as people usually want to see those.
+      if (isEmbed) {
+        var attributeValues = [].map.call(element.attributes, function(attr) {
+          return attr.value;
+        }).join("|");
+
+        // First, check the elements attributes to see if any of them contain youtube or vimeo
+        if (this.REGEXPS.videos.test(attributeValues))
+          return false;
+
+        // Then check the elements inside this element for the same.
+        if (this.REGEXPS.videos.test(element.innerHTML))
+          return false;
+      }
+
+      return true;
+    });
+  },
+
+  /**
+   * Check if a given node has one of its ancestor tag name matching the
+   * provided one.
+   * @param  HTMLElement node
+   * @param  String      tagName
+   * @param  Number      maxDepth
+   * @return Boolean
+   */
+  _hasAncestorTag: function(node, tagName, maxDepth) {
+    maxDepth = maxDepth || 3;
+    tagName = tagName.toUpperCase();
+    var depth = 0;
+    while (node.parentNode) {
+      if (depth > maxDepth)
+        return false;
+      if (node.parentNode.tagName === tagName)
+        return true;
+      node = node.parentNode;
+      depth++;
+    }
+    return false;
+  },
+
+  /**
+   * Clean an element of all tags of type "tag" if they look fishy.
+   * "Fishy" is an algorithm based on content length, classnames, link density, number of images & embeds, etc.
+   *
+   * @return void
+   **/
+  _cleanConditionally: function(e, tag) {
+    if (!this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY))
+      return;
+
+    var isList = tag === "ul" || tag === "ol";
+
+    // Gather counts for other typical elements embedded within.
+    // Traverse backwards so we can remove nodes at the same time
+    // without effecting the traversal.
+    //
+    // TODO: Consider taking into account original contentScore here.
+    this._removeNodes(e.getElementsByTagName(tag), function(node) {
+      var weight = this._getClassWeight(node);
+      var contentScore = 0;
+
+      this.log("Cleaning Conditionally", node);
+
+      if (weight + contentScore < 0) {
+        return true;
+      }
+
+      if (this._getCharCount(node, ',') < 10) {
+        // If there are not very many commas, and the number of
+        // non-paragraph elements is more than paragraphs or other
+        // ominous signs, remove the element.
+        var p = node.getElementsByTagName("p").length;
+        var img = node.getElementsByTagName("img").length;
+        var li = node.getElementsByTagName("li").length-100;
+        var input = node.getElementsByTagName("input").length;
+
+        var embedCount = 0;
+        var embeds = node.getElementsByTagName("embed");
+        for (var ei = 0, il = embeds.length; ei < il; ei += 1) {
+          if (!this.REGEXPS.videos.test(embeds[ei].src))
+            embedCount += 1;
+        }
+
+        var linkDensity = this._getLinkDensity(node);
+        var contentLength = this._getInnerText(node).length;
+
+        var haveToRemove =
+          // Make an exception for elements with no p's and exactly 1 img.
+          (img > p && !this._hasAncestorTag(node, "figure")) ||
+          (!isList && li > p) ||
+          (input > Math.floor(p/3)) ||
+          (!isList && contentLength < 25 && (img === 0 || img > 2)) ||
+          (!isList && weight < 25 && linkDensity > 0.2) ||
+          (weight >= 25 && linkDensity > 0.5) ||
+          ((embedCount === 1 && contentLength < 75) || embedCount > 1);
+        return haveToRemove;
+      }
+      return false;
+    });
+  },
+
+  /**
+   * Clean out spurious headers from an Element. Checks things like classnames and link density.
+   *
+   * @param Element
+   * @return void
+  **/
+  _cleanHeaders: function(e) {
+    for (var headerIndex = 1; headerIndex < 3; headerIndex += 1) {
+      this._removeNodes(e.getElementsByTagName('h' + headerIndex), function (header) {
+        return this._getClassWeight(header) < 0;
+      });
+    }
+  },
+
+  _flagIsActive: function(flag) {
+    return (this._flags & flag) > 0;
+  },
+
+  _addFlag: function(flag) {
+    this._flags = this._flags | flag;
+  },
+
+  _removeFlag: function(flag) {
+    this._flags = this._flags & ~flag;
+  },
+
+  /**
+   * Decides whether or not the document is reader-able without parsing the whole thing.
+   *
+   * @return boolean Whether or not we suspect parse() will suceeed at returning an article object.
+   */
+  isProbablyReaderable: function(helperIsVisible) {
+    var nodes = this._getAllNodesWithTag(this._doc, ["p", "pre"]);
+
+    // Get <div> nodes which have <br> node(s) and append them into the `nodes` variable.
+    // Some articles' DOM structures might look like
+    // <div>
+    //   Sentences<br>
+    //   <br>
+    //   Sentences<br>
+    // </div>
+    var brNodes = this._getAllNodesWithTag(this._doc, ["div > br"]);
+    if (brNodes.length) {
+      var set = new Set();
+      [].forEach.call(brNodes, function(node) {
+        set.add(node.parentNode);
+      });
+      nodes = [].concat.apply(Array.from(set), nodes);
+    }
+
+    // FIXME we should have a fallback for helperIsVisible, but this is
+    // problematic because of jsdom's elem.style handling - see
+    // https://github.com/mozilla/readability/pull/186 for context.
+
+    var score = 0;
+    // This is a little cheeky, we use the accumulator 'score' to decide what to return from
+    // this callback:
+    return this._someNode(nodes, function(node) {
+      if (helperIsVisible && !helperIsVisible(node))
+        return false;
+      var matchString = node.className + " " + node.id;
+
+      if (this.REGEXPS.unlikelyCandidates.test(matchString) &&
+          !this.REGEXPS.okMaybeItsACandidate.test(matchString)) {
+        return false;
+      }
+
+      if (node.matches && node.matches("li p")) {
+        return false;
+      }
+
+      var textContentLength = node.textContent.trim().length;
+      if (textContentLength < 140) {
+        return false;
+      }
+
+      score += Math.sqrt(textContentLength - 140);
+
+      if (score > 20) {
+        return true;
+      }
+      return false;
+    });
+  },
+
+  /**
+   * Runs readability.
+   *
+   * Workflow:
+   *  1. Prep the document by removing script tags, css, etc.
+   *  2. Build readability's DOM tree.
+   *  3. Grab the article content from the current dom tree.
+   *  4. Replace the current DOM tree with the new one.
+   *  5. Read peacefully.
+   *
+   * @return void
+   **/
+  parse: function () {
+    // Avoid parsing too large documents, as per configuration option
+    if (this._maxElemsToParse > 0) {
+      var numTags = this._doc.getElementsByTagName("*").length;
+      if (numTags > this._maxElemsToParse) {
+        throw new Error("Aborting parsing document; " + numTags + " elements found");
+      }
+    }
+
+    if (typeof this._doc.documentElement.firstElementChild === "undefined") {
+      this._getNextNode = this._getNextNodeNoElementProperties;
+    }
+    // Remove script tags from the document.
+    this._removeScripts(this._doc);
+
+    // FIXME: Disabled multi-page article support for now as it
+    // needs more work on infrastructure.
+
+    // Make sure this document is added to the list of parsed pages first,
+    // so we don't double up on the first page.
+    // this._parsedPages[uri.spec.replace(/\/$/, '')] = true;
+
+    // Pull out any possible next page link first.
+    // var nextPageLink = this._findNextPageLink(doc.body);
+
+    this._prepDocument();
+
+    var metadata = this._getArticleMetadata();
+    var articleTitle = metadata.title || this._getArticleTitle();
+
+    var articleContent = this._grabArticle();
+    if (!articleContent)
+      return null;
+
+    this.log("Grabbed: " + articleContent.innerHTML);
+
+    this._postProcessContent(articleContent);
+
+    // if (nextPageLink) {
+    //   // Append any additional pages after a small timeout so that people
+    //   // can start reading without having to wait for this to finish processing.
+    //   setTimeout((function() {
+    //     this._appendNextPage(nextPageLink);
+    //   }).bind(this), 500);
+    // }
+
+    // If we haven't found an excerpt in the article's metadata, use the article's
+    // first paragraph as the excerpt. This is used for displaying a preview of
+    // the article's content.
+    if (!metadata.excerpt) {
+      var paragraphs = articleContent.getElementsByTagName("p");
+      if (paragraphs.length > 0) {
+        metadata.excerpt = paragraphs[0].textContent.trim();
+      }
+    }
+
+    var textContent = articleContent.textContent;
+    return {
+      uri: this._uri,
+      title: articleTitle,
+      byline: metadata.byline || this._articleByline,
+      dir: this._articleDir,
+      content: articleContent.innerHTML,
+      textContent: textContent,
+      length: textContent.length,
+      excerpt: metadata.excerpt,
+    };
+  }
+};