diff --git a/assets/index.html b/assets/index.html index 2d9cac8..ddbacb4 100644 --- a/assets/index.html +++ b/assets/index.html @@ -387,7 +387,7 @@ - + diff --git a/assets/javascripts/Readability.js b/assets/javascripts/Readability.js deleted file mode 100644 index 7a3f5c7..0000000 --- a/assets/javascripts/Readability.js +++ /dev/null @@ -1,2071 +0,0 @@ -/*eslint-env es6:false*/ -/* - * 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 {HTMLDocument} doc The document to parse. - * @param {Object} options The options object. - */ -function Readability(doc, options) { - // In some older versions, people passed a URI as the first argument. Cope: - if (options && options.documentElement) { - doc = options; - options = arguments[2]; - } else if (!doc || !doc.documentElement) { - throw new Error("First argument to Readability constructor should be a document object."); - } - options = options || {}; - - this._doc = doc; - this._docJSDOMParser = this._doc.firstChild.__JSDOMParser__; - this._articleTitle = null; - this._articleByline = null; - this._articleDir = null; - this._articleSiteName = null; - this._attempts = []; - - // Configurable 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._charThreshold = options.charThreshold || this.DEFAULT_CHAR_THRESHOLD; - this._classesToPreserve = this.CLASSES_TO_PRESERVE.concat(options.classesToPreserve || []); - this._keepClasses = !!options.keepClasses; - - // Start with all flags set - this._flags = this.FLAG_STRIP_UNLIKELYS | - this.FLAG_WEIGHT_CLASSES | - this.FLAG_CLEAN_CONDITIONALLY; - - 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, - - // https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType - ELEMENT_NODE: 1, - TEXT_NODE: 3, - - // 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, - - // Element tags to score by default. - DEFAULT_TAGS_TO_SCORE: "section,h2,h3,h4,h5,h6,p,td,pre".toUpperCase().split(","), - - // The default number of chars an article must have in order to return a result - DEFAULT_CHAR_THRESHOLD: 500, - - // All of the regular expressions in use within readability. - // Defined up here so we don't instantiate them repeatedly in loops. - REGEXPS: { - // NOTE: These two regular expressions are duplicated in - // Readability-readerable.js. Please keep both copies in sync. - unlikelyCandidates: /-ad-|ai2html|banner|breadcrumbs|combx|comment|community|cover-wrap|disqus|extra|footer|gdpr|header|legends|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|yom-remote/i, - okMaybeItsACandidate: /and|article|body|column|content|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|gdpr|masthead|media|meta|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|v\.qq)\.com|(archive|upload\.wikimedia)\.org|player\.twitch\.tv)/i, - shareElements: /(\b|_)(share|sharedaddy)(\b|_)/i, - nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i, - prevLink: /(prev|earl|old|new|<|«)/i, - whitespace: /^\s*$/, - hasContent: /\S$/, - srcsetUrl: /(\S+)(\s+[\d.]+[xw])?(\s*(?:,|$))/g, - b64DataUrl: /^data:\s*([^\s;,]+)\s*;\s*base64\s*,/i - }, - - DIV_TO_P_ELEMS: [ "A", "BLOCKQUOTE", "DL", "DIV", "IMG", "OL", "P", "PRE", "TABLE", "UL", "SELECT" ], - - ALTER_TO_DIV_EXCEPTIONS: ["DIV", "ARTICLE", "SECTION", "P"], - - PRESENTATIONAL_ATTRIBUTES: [ "align", "background", "bgcolor", "border", "cellpadding", "cellspacing", "frame", "hspace", "rules", "style", "valign", "vspace" ], - - DEPRECATED_SIZE_ATTRIBUTE_ELEMS: [ "TABLE", "TH", "TD", "HR", "PRE" ], - - // The commented out elements qualify as phrasing content but tend to be - // removed by readability when put into paragraphs, so we ignore them here. - PHRASING_ELEMS: [ - // "CANVAS", "IFRAME", "SVG", "VIDEO", - "ABBR", "AUDIO", "B", "BDO", "BR", "BUTTON", "CITE", "CODE", "DATA", - "DATALIST", "DFN", "EM", "EMBED", "I", "IMG", "INPUT", "KBD", "LABEL", - "MARK", "MATH", "METER", "NOSCRIPT", "OBJECT", "OUTPUT", "PROGRESS", "Q", - "RUBY", "SAMP", "SCRIPT", "SELECT", "SMALL", "SPAN", "STRONG", "SUB", - "SUP", "TEXTAREA", "TIME", "VAR", "WBR" - ], - - // These are the classes that readability sets itself. - CLASSES_TO_PRESERVE: [ "page" ], - - // These are the list of HTML entities that need to be escaped. - HTML_ESCAPE_MAP: { - "lt": "<", - "gt": ">", - "amp": "&", - "quot": '"', - "apos": "'", - }, - - /** - * 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); - - if (!this._keepClasses) { - // Remove classes. - this._cleanClasses(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 nodes to operate on - * @param Function filterFn the function to use as a filter - * @return void - */ - _removeNodes: function(nodeList, filterFn) { - // Avoid ever operating on live node lists. - if (this._docJSDOMParser && nodeList._isLiveNodeList) { - throw new Error("Do not pass live node lists to _removeNodes"); - } - 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); - } - } - } - }, - - /** - * Iterates over a NodeList, and calls _setNodeTag for each node. - * - * @param NodeList nodeList The nodes to operate on - * @param String newTagName the new tag name to use - * @return void - */ - _replaceNodeTags: function(nodeList, newTagName) { - // Avoid ever operating on live node lists. - if (this._docJSDOMParser && nodeList._isLiveNodeList) { - throw new Error("Do not pass live node lists to _replaceNodeTags"); - } - for (var i = nodeList.length - 1; i >= 0; i--) { - var node = nodeList[i]; - this._setNodeTag(node, newTagName); - } - }, - - /** - * 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. - * @return void - */ - _forEachNode: function(nodeList, fn) { - 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); - }, - - /** - * Iterate over a NodeList, return true if all of the provided iterate - * function calls return 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 - */ - _everyNode: function(nodeList, fn) { - return Array.prototype.every.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); - })); - }, - - /** - * Removes the class="" attribute from every element in the given - * subtree, except those that match CLASSES_TO_PRESERVE and - * the classesToPreserve array from the options object. - * - * @param Element - * @return void - */ - _cleanClasses: function(node) { - var classesToPreserve = this._classesToPreserve; - var className = (node.getAttribute("class") || "") - .split(/\s+/) - .filter(function(cls) { - return classesToPreserve.indexOf(cls) != -1; - }) - .join(" "); - - if (className) { - node.setAttribute("class", className); - } else { - node.removeAttribute("class"); - } - - for (node = node.firstElementChild; node; node = node.nextElementSibling) { - this._cleanClasses(node); - } - }, - - /** - * Converts each and uri in the given element to an absolute URI, - * ignoring #ref URIs. - * - * @param Element - * @return void - */ - _fixRelativeUris: function(articleContent) { - var baseURI = this._doc.baseURI; - var documentURI = this._doc.documentURI; - function toAbsoluteURI(uri) { - // Leave hash links alone if the base URI matches the document URI: - if (baseURI == documentURI && uri.charAt(0) == "#") { - return uri; - } - - // Otherwise, resolve against base URI: - try { - return new URL(uri, baseURI).href; - } catch (ex) { - // Something went wrong, just return the original: - } - return uri; - } - - var links = this._getAllNodesWithTag(articleContent, ["a"]); - this._forEachNode(links, function(link) { - var href = link.getAttribute("href"); - if (href) { - // Remove links with javascript: URIs, since - // they won't work after scripts have been removed from the page. - if (href.indexOf("javascript:") === 0) { - // if the link only contains simple text content, it can be converted to a text node - if (link.childNodes.length === 1 && link.childNodes[0].nodeType === this.TEXT_NODE) { - var text = this._doc.createTextNode(link.textContent); - link.parentNode.replaceChild(text, link); - } else { - // if the link has multiple children, they should all be preserved - var container = this._doc.createElement("span"); - while (link.childNodes.length > 0) { - container.appendChild(link.childNodes[0]); - } - link.parentNode.replaceChild(container, link); - } - } else { - link.setAttribute("href", toAbsoluteURI(href)); - } - } - }); - - var medias = this._getAllNodesWithTag(articleContent, [ - "img", "picture", "figure", "video", "audio", "source" - ]); - - this._forEachNode(medias, function(media) { - var src = media.getAttribute("src"); - var poster = media.getAttribute("poster"); - var srcset = media.getAttribute("srcset"); - - if (src) { - media.setAttribute("src", toAbsoluteURI(src)); - } - - if (poster) { - media.setAttribute("poster", toAbsoluteURI(poster)); - } - - if (srcset) { - var newSrcset = srcset.replace(this.REGEXPS.srcsetUrl, function(_, p1, p2, p3) { - return toAbsoluteURI(p1) + (p2 || "") + p3; - }); - - media.setAttribute("srcset", newSrcset); - } - }); - }, - - /** - * Get the article title as an H1. - * - * @return void - **/ - _getArticleTitle: function() { - var doc = this._doc; - var curTitle = ""; - var origTitle = ""; - - try { - curTitle = origTitle = doc.title.trim(); - - // 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. */} - - var titleHadHierarchicalSeparators = false; - function wordCount(str) { - return str.split(/\s+/).length; - } - - // If there's a separator in the title, first remove the final part - if ((/ [\|\-\\\/>»] /).test(curTitle)) { - titleHadHierarchicalSeparators = / [\\\/>»] /.test(curTitle); - curTitle = origTitle.replace(/(.*)[\|\-\\\/>»] .*/gi, "$1"); - - // If the resulting title is too short (3 words or fewer), remove - // the first part instead: - if (wordCount(curTitle) < 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 trimmedTitle = curTitle.trim(); - var match = this._someNode(headings, function(heading) { - return heading.textContent.trim() === trimmedTitle; - }); - - // 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 (wordCount(curTitle) < 3) { - curTitle = origTitle.substring(origTitle.indexOf(":") + 1); - // But if we have too many words before the colon there's something weird - // with the titles and the H tags so let's just use the original title instead - } else if (wordCount(origTitle.substr(0, origTitle.indexOf(":"))) > 5) { - curTitle = origTitle; - } - } - } 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().replace(this.REGEXPS.normalize, " "); - // If we now have 4 words or fewer as our title, and either no - // 'hierarchical' separators (\, /, > or ») were found in the original - // title or we decreased the number of words by more than 1 word, use - // the original title. - var curTitleWordCount = wordCount(curTitle); - if (curTitleWordCount <= 4 && - (!titleHadHierarchicalSeparators || - curTitleWordCount != wordCount(origTitle.replace(/[\|\-\\\/>»]+/g, "")) - 1)) { - 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(this._getAllNodesWithTag(doc, ["style"])); - - if (doc.body) { - this._replaceBrs(doc.body); - } - - this._replaceNodeTags(this._getAllNodesWithTag(doc, ["font"]), "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 != this.ELEMENT_NODE) - && this.REGEXPS.whitespace.test(next.textContent)) { - next = next.nextSibling; - } - return next; - }, - - /** - * Replaces 2 or more successive
elements with a single

. - * Whitespace between
elements are ignored. For example: - *

foo
bar


abc
- * will become: - *
foo
bar

abc

- */ - _replaceBrs: function (elem) { - this._forEachNode(this._getAllNodesWithTag(elem, ["br"]), function(br) { - var next = br.nextSibling; - - // Whether 2 or more
elements have been found and replaced with a - //

block. - var replaced = false; - - // If we find a
chain, remove the
s until we hit another element - // or non-whitespace. This leaves behind the first
in the chain - // (which will be replaced with a

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
chain, replace the remaining
with a

. Add - // all sibling nodes as children of the

until we hit another
- // chain. - if (replaced) { - var p = this._doc.createElement("p"); - br.parentNode.replaceChild(p, br); - - next = p.nextSibling; - while (next) { - // If we've hit another

, we're done adding children to this

. - if (next.tagName == "BR") { - var nextElem = this._nextElement(next.nextSibling); - if (nextElem && nextElem.tagName == "BR") - break; - } - - if (!this._isPhrasingContent(next)) - break; - - // Otherwise, make this node a child of the new

. - var sibling = next.nextSibling; - p.appendChild(next); - next = sibling; - } - - while (p.lastChild && this._isWhitespace(p.lastChild)) { - p.removeChild(p.lastChild); - } - - if (p.parentNode.tagName === "P") - this._setNodeTag(p.parentNode, "DIV"); - } - }); - }, - - _setNodeTag: function (node, tag) { - this.log("_setNodeTag", node, tag); - if (this._docJSDOMParser) { - 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++) { - try { - replacement.setAttribute(node.attributes[i].name, node.attributes[i].value); - } catch (ex) { - /* it's possible for setAttribute() to throw if the attribute name - * isn't a valid XML Name. Such attributes can however be parsed from - * source in HTML docs, see https://github.com/whatwg/html/issues/4275, - * so we can hit them here and then throw. We don't care about such - * attributes so we ignore them. - */ - } - } - return replacement; - }, - - /** - * Prepare the article node for display. Clean out any inline styles, - * iframes, forms, strip extraneous

tags, etc. - * - * @param Element - * @return void - **/ - _prepArticle: function(articleContent) { - this._cleanStyles(articleContent); - - // Check for data tables before we continue, to avoid removing items in - // those tables, which will often be isolated even though they're - // visually linked to other content-ful elements (text, images, etc.). - this._markDataTables(articleContent); - - this._fixLazyImages(articleContent); - - // Clean out junk from the article content - this._cleanConditionally(articleContent, "form"); - this._cleanConditionally(articleContent, "fieldset"); - this._clean(articleContent, "object"); - this._clean(articleContent, "embed"); - this._clean(articleContent, "h1"); - this._clean(articleContent, "footer"); - this._clean(articleContent, "link"); - this._clean(articleContent, "aside"); - - // Clean out elements with little content that have "share" in their id/class combinations from final top candidates, - // which means we don't remove the top candidates even they have "share". - - var shareElementThreshold = this.DEFAULT_CHAR_THRESHOLD; - - this._forEachNode(articleContent.children, function (topCandidate) { - this._cleanMatchedNodes(topCandidate, function (node, matchString) { - return this.REGEXPS.shareElements.test(matchString) && node.textContent.length < shareElementThreshold; - }); - }); - - // If there is only one h2 and its text content substantially equals article title, - // they are probably using it as a header and not a subheader, - // so remove it since we already extract the title separately. - var h2 = articleContent.getElementsByTagName("h2"); - if (h2.length === 1) { - var lengthSimilarRate = (h2[0].textContent.length - this._articleTitle.length) / this._articleTitle.length; - if (Math.abs(lengthSimilarRate) < 0.5) { - var titlesMatch = false; - if (lengthSimilarRate > 0) { - titlesMatch = h2[0].textContent.includes(this._articleTitle); - } else { - titlesMatch = this._articleTitle.includes(h2[0].textContent); - } - if (titlesMatch) { - this._clean(articleContent, "h2"); - } - } - } - - this._clean(articleContent, "iframe"); - this._clean(articleContent, "input"); - this._clean(articleContent, "textarea"); - this._clean(articleContent, "select"); - this._clean(articleContent, "button"); - 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(this._getAllNodesWithTag(articleContent, ["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); - }); - - // Remove single-cell tables - this._forEachNode(this._getAllNodesWithTag(articleContent, ["table"]), function(table) { - var tbody = this._hasSingleTagInsideElement(table, "TBODY") ? table.firstElementChild : table; - if (this._hasSingleTagInsideElement(tbody, "TR")) { - var row = tbody.firstElementChild; - if (this._hasSingleTagInsideElement(row, "TD")) { - var cell = row.firstElementChild; - cell = this._setNodeTag(cell, this._everyNode(cell.childNodes, this._isPhrasingContent) ? "P" : "DIV"); - table.parentNode.replaceChild(cell, table); - } - } - }); - }, - - /** - * 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; - }, - - _checkByline: function(node, matchString) { - if (this._articleByline) { - return false; - } - - if (node.getAttribute !== undefined) { - var rel = node.getAttribute("rel"); - var itemprop = node.getAttribute("itemprop"); - } - - if ((rel === "author" || (itemprop && itemprop.indexOf("author") !== -1) || 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; - - 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; - - if (!this._isProbablyVisible(node)) { - this.log("Removing hidden node - " + matchString); - node = this._removeAndGetNext(node); - continue; - } - - // 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) && - !this._hasAncestorTag(node, "table") && - node.tagName !== "BODY" && - node.tagName !== "A") { - this.log("Removing unlikely candidate - " + matchString); - node = this._removeAndGetNext(node); - continue; - } - - if (node.getAttribute("role") == "complementary") { - this.log("Removing complementary content - " + matchString); - node = this._removeAndGetNext(node); - continue; - } - } - - // Remove DIV, SECTION, and HEADER nodes without any content(e.g. text, image, video, or iframe). - if ((node.tagName === "DIV" || node.tagName === "SECTION" || node.tagName === "HEADER" || - node.tagName === "H1" || node.tagName === "H2" || node.tagName === "H3" || - node.tagName === "H4" || node.tagName === "H5" || node.tagName === "H6") && - this._isElementWithoutContent(node)) { - 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") { - // Put phrasing content into paragraphs. - var p = null; - var childNode = node.firstChild; - while (childNode) { - var nextSibling = childNode.nextSibling; - if (this._isPhrasingContent(childNode)) { - if (p !== null) { - p.appendChild(childNode); - } else if (!this._isWhitespace(childNode)) { - p = doc.createElement("p"); - node.replaceChild(p, childNode); - p.appendChild(childNode); - } - } else if (p !== null) { - while (p.lastChild && this._isWhitespace(p.lastChild)) { - p.removeChild(p.lastChild); - } - p = null; - } - childNode = nextSibling; - } - - // 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._hasSingleTagInsideElement(node, "P") && this._getLinkDensity(node) < 0.25) { - var newNode = node.children[0]; - node.parentNode.replaceChild(newNode, node); - node = newNode; - elementsToScore.push(node); - } else if (!this._hasChildBlockElement(node)) { - node = this._setNodeTag(node, "P"); - elementsToScore.push(node); - } - } - 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 || !ancestor.parentNode || typeof(ancestor.parentNode.tagName) === "undefined") - 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; - var parentOfTopCandidate; - - // 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) { - // Find a better top candidate node if it contains (at least three) nodes which belong to `topCandidates` array - // and whose scores are quite closed with current `topCandidate` node. - var alternativeCandidateAncestors = []; - for (var i = 1; i < topCandidates.length; i++) { - if (topCandidates[i].readability.contentScore / topCandidate.readability.contentScore >= 0.75) { - alternativeCandidateAncestors.push(this._getNodeAncestors(topCandidates[i])); - } - } - var MINIMUM_TOPCANDIDATES = 3; - if (alternativeCandidateAncestors.length >= MINIMUM_TOPCANDIDATES) { - parentOfTopCandidate = topCandidate.parentNode; - while (parentOfTopCandidate.tagName !== "BODY") { - var listsContainingThisAncestor = 0; - for (var ancestorIndex = 0; ancestorIndex < alternativeCandidateAncestors.length && listsContainingThisAncestor < MINIMUM_TOPCANDIDATES; ancestorIndex++) { - listsContainingThisAncestor += Number(alternativeCandidateAncestors[ancestorIndex].includes(parentOfTopCandidate)); - } - if (listsContainingThisAncestor >= MINIMUM_TOPCANDIDATES) { - topCandidate = parentOfTopCandidate; - break; - } - parentOfTopCandidate = parentOfTopCandidate.parentNode; - } - } - if (!topCandidate.readability) { - this._initializeNode(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. - parentOfTopCandidate = topCandidate.parentNode; - var lastScore = topCandidate.readability.contentScore; - // The scores shouldn't get too low. - var scoreThreshold = lastScore / 3; - while (parentOfTopCandidate.tagName !== "BODY") { - if (!parentOfTopCandidate.readability) { - parentOfTopCandidate = parentOfTopCandidate.parentNode; - continue; - } - 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; - } - - // If the top candidate is the only child, use parent instead. This will help sibling - // joining logic when adjacent content is actually located in parent's sibling node. - parentOfTopCandidate = topCandidate.parentNode; - while (parentOfTopCandidate.tagName != "BODY" && parentOfTopCandidate.children.length == 1) { - topCandidate = parentOfTopCandidate; - parentOfTopCandidate = topCandidate.parentNode; - } - if (!topCandidate.readability) { - this._initializeNode(topCandidate); - } - } - - // 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); - // Keep potential top candidate's parent node to try to get text direction of it later. - parentOfTopCandidate = topCandidate.parentNode; - var siblings = parentOfTopCandidate.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 (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); - - var parseSuccessful = true; - - // 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. - var textLength = this._getInnerText(articleContent, true).length; - if (textLength < this._charThreshold) { - parseSuccessful = false; - page.innerHTML = pageCacheHtml; - - if (this._flagIsActive(this.FLAG_STRIP_UNLIKELYS)) { - this._removeFlag(this.FLAG_STRIP_UNLIKELYS); - this._attempts.push({articleContent: articleContent, textLength: textLength}); - } else if (this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) { - this._removeFlag(this.FLAG_WEIGHT_CLASSES); - this._attempts.push({articleContent: articleContent, textLength: textLength}); - } else if (this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) { - this._removeFlag(this.FLAG_CLEAN_CONDITIONALLY); - this._attempts.push({articleContent: articleContent, textLength: textLength}); - } else { - this._attempts.push({articleContent: articleContent, textLength: textLength}); - // No luck after removing flags, just return the longest text we found during the different loops - this._attempts.sort(function (a, b) { - return b.textLength - a.textLength; - }); - - // But first check if we actually have something - if (!this._attempts[0].textLength) { - return null; - } - - articleContent = this._attempts[0].articleContent; - parseSuccessful = true; - } - } - - if (parseSuccessful) { - // Find out text direction from ancestors of final top candidate. - var ancestors = [parentOfTopCandidate, topCandidate].concat(this._getNodeAncestors(parentOfTopCandidate)); - this._someNode(ancestors, function(ancestor) { - if (!ancestor.tagName) - return false; - var articleDir = ancestor.getAttribute("dir"); - if (articleDir) { - this._articleDir = articleDir; - return true; - } - return false; - }); - 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; - }, - - /** - * Converts some of the common HTML entities in string to their corresponding characters. - * - * @param str {string} - a string to unescape. - * @return string without HTML entity. - */ - _unescapeHtmlEntities: function(str) { - if (!str) { - return str; - } - - var htmlEscapeMap = this.HTML_ESCAPE_MAP; - return str.replace(/&(quot|amp|apos|lt|gt);/g, function(_, tag) { - return htmlEscapeMap[tag]; - }).replace(/&#(?:x([0-9a-z]{1,4})|([0-9]{1,4}));/gi, function(_, hex, numStr) { - var num = parseInt(hex || numStr, hex ? 16 : 10); - return String.fromCharCode(num); - }); - }, - - /** - * 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"); - - // property is a space-separated list of values - var propertyPattern = /\s*(dc|dcterm|og|twitter)\s*:\s*(author|creator|description|title|site_name)\s*/gi; - - // name is a single value - var namePattern = /^\s*(?:(dc|dcterm|og|twitter|weibo:(article|webpage))\s*[\.:]\s*)?(author|creator|description|title|site_name)\s*$/i; - - // Find description tags. - this._forEachNode(metaElements, function(element) { - var elementName = element.getAttribute("name"); - var elementProperty = element.getAttribute("property"); - var content = element.getAttribute("content"); - if (!content) { - return; - } - var matches = null; - var name = null; - - if (elementProperty) { - matches = elementProperty.match(propertyPattern); - if (matches) { - for (var i = matches.length - 1; i >= 0; i--) { - // Convert to lowercase, and remove any whitespace - // so we can match below. - name = matches[i].toLowerCase().replace(/\s/g, ""); - // multiple authors - values[name] = content.trim(); - } - } - } - if (!matches && elementName && namePattern.test(elementName)) { - name = elementName; - if (content) { - // Convert to lowercase, remove any whitespace, and convert dots - // to colons so we can match below. - name = name.toLowerCase().replace(/\s/g, "").replace(/\./g, ":"); - values[name] = content.trim(); - } - } - }); - - // get title - metadata.title = values["dc:title"] || - values["dcterm:title"] || - values["og:title"] || - values["weibo:article:title"] || - values["weibo:webpage:title"] || - values["title"] || - values["twitter:title"]; - - if (!metadata.title) { - metadata.title = this._getArticleTitle(); - } - - // get author - metadata.byline = values["dc:creator"] || - values["dcterm:creator"] || - values["author"]; - - // get description - metadata.excerpt = values["dc:description"] || - values["dcterm:description"] || - values["og:description"] || - values["weibo:article:description"] || - values["weibo:webpage:description"] || - values["description"] || - values["twitter:description"]; - - // get site name - metadata.siteName = values["og:site_name"]; - - // in many sites the meta value is escaped with HTML entities, - // so here we need to unescape it - metadata.title = this._unescapeHtmlEntities(metadata.title); - metadata.byline = this._unescapeHtmlEntities(metadata.byline); - metadata.excerpt = this._unescapeHtmlEntities(metadata.excerpt); - metadata.siteName = this._unescapeHtmlEntities(metadata.siteName); - - return metadata; - }, - - /** - * Check if node is image, or if node contains exactly only one image - * whether as a direct child or as its descendants. - * - * @param Element - **/ - _isSingleImage: function(node) { - if (node.tagName === "IMG") { - return true; - } - - if (node.children.length !== 1 || node.textContent.trim() !== "") { - return false; - } - - return this._isSingleImage(node.children[0]); - }, - - /** - * Find all