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+/* eslint-env es6:false */
+/* globals exports */
+/*
+ * 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
+ */
+
+var REGEXPS = {
+ // NOTE: These two regular expressions are duplicated in
+ // Readability.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,
+};
+
+function isNodeVisible(node) {
+ // Have to null-check node.style and node.className.indexOf to deal with SVG and MathML nodes.
+ return (!node.style || node.style.display != "none")
+ && !node.hasAttribute("hidden")
+ //check for "fallback-image" so that wikimedia math images are displayed
+ && (!node.hasAttribute("aria-hidden") || node.getAttribute("aria-hidden") != "true" || (node.className && node.className.indexOf && node.className.indexOf("fallback-image") !== -1));
+}
+
+/**
+ * Decides whether or not the document is reader-able without parsing the whole thing.
+ * @param {Object} options Configuration object.
+ * @param {number} [options.minContentLength=140] The minimum node content length used to decide if the document is readerable.
+ * @param {number} [options.minScore=20] The minumum cumulated 'score' used to determine if the document is readerable.
+ * @param {Function} [options.visibilityChecker=isNodeVisible] The function used to determine if a node is visible.
+ * @return {boolean} Whether or not we suspect Readability.parse() will suceeed at returning an article object.
+ */
+function isProbablyReaderable(doc, options = {}) {
+ // For backward compatibility reasons 'options' can either be a configuration object or the function used
+ // to determine if a node is visible.
+ if (typeof options == "function") {
+ options = { visibilityChecker: options };
+ }
+
+ var defaultOptions = { minScore: 20, minContentLength: 140, visibilityChecker: isNodeVisible };
+ options = Object.assign(defaultOptions, options);
+
+ var nodes = doc.querySelectorAll("p, pre, article");
+
+ // 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 = doc.querySelectorAll("div > br");
+ if (brNodes.length) {
+ var set = new Set(nodes);
+ [].forEach.call(brNodes, function (node) {
+ set.add(node.parentNode);
+ });
+ nodes = Array.from(set);
+ }
+
+ var score = 0;
+ // This is a little cheeky, we use the accumulator 'score' to decide what to return from
+ // this callback:
+ return [].some.call(nodes, function (node) {
+ if (!options.visibilityChecker(node)) {
+ return false;
+ }
+
+ var matchString = node.className + " " + node.id;
+ if (REGEXPS.unlikelyCandidates.test(matchString) &&
+ !REGEXPS.okMaybeItsACandidate.test(matchString)) {
+ return false;
+ }
+
+ if (node.matches("li p")) {
+ return false;
+ }
+
+ var textContentLength = node.textContent.trim().length;
+ if (textContentLength < options.minContentLength) {
+ return false;
+ }
+
+ score += Math.sqrt(textContentLength - options.minContentLength);
+
+ if (score > options.minScore) {
+ return true;
+ }
+ return false;
+ });
+}
+
+if (typeof module === "object") {
+ module.exports = isProbablyReaderable;
+}