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@philips
Last active February 23, 2024 22:45
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/* Optional vault name */
const vault = "";
/* Optional folder name such as "Clippings/" */
const folder = "";
/* Optional tags */
let tags = "clippings";
/*
*
* Embed turndown@6.0.0 to work around content security policies breaking import statements
*
*/
function extend (destination) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i];
for (var key in source) {
if (source.hasOwnProperty(key)) destination[key] = source[key];
}
}
return destination
}
function repeat (character, count) {
return Array(count + 1).join(character)
}
var blockElements = [
'address', 'article', 'aside', 'audio', 'blockquote', 'body', 'canvas',
'center', 'dd', 'dir', 'div', 'dl', 'dt', 'fieldset', 'figcaption',
'figure', 'footer', 'form', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6',
'header', 'hgroup', 'hr', 'html', 'isindex', 'li', 'main', 'menu', 'nav',
'noframes', 'noscript', 'ol', 'output', 'p', 'pre', 'section', 'table',
'tbody', 'td', 'tfoot', 'th', 'thead', 'tr', 'ul'
];
function isBlock (node) {
return blockElements.indexOf(node.nodeName.toLowerCase()) !== -1
}
var voidElements = [
'area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input',
'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr'
];
function isVoid (node) {
return voidElements.indexOf(node.nodeName.toLowerCase()) !== -1
}
var voidSelector = voidElements.join();
function hasVoid (node) {
return node.querySelector && node.querySelector(voidSelector)
}
var rules = {};
rules.paragraph = {
filter: 'p',
replacement: function (content) {
return '\n\n' + content + '\n\n'
}
};
rules.lineBreak = {
filter: 'br',
replacement: function (content, node, options) {
return options.br + '\n'
}
};
rules.heading = {
filter: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'],
replacement: function (content, node, options) {
var hLevel = Number(node.nodeName.charAt(1));
if (options.headingStyle === 'setext' && hLevel < 3) {
var underline = repeat((hLevel === 1 ? '=' : '-'), content.length);
return (
'\n\n' + content + '\n' + underline + '\n\n'
)
} else {
return '\n\n' + repeat('#', hLevel) + ' ' + content + '\n\n'
}
}
};
rules.blockquote = {
filter: 'blockquote',
replacement: function (content) {
content = content.replace(/^\n+|\n+$/g, '');
content = content.replace(/^/gm, '> ');
return '\n\n' + content + '\n\n'
}
};
rules.list = {
filter: ['ul', 'ol'],
replacement: function (content, node) {
var parent = node.parentNode;
if (parent.nodeName === 'LI' && parent.lastElementChild === node) {
return '\n' + content
} else {
return '\n\n' + content + '\n\n'
}
}
};
rules.listItem = {
filter: 'li',
replacement: function (content, node, options) {
content = content
.replace(/^\n+/, '') // remove leading newlines
.replace(/\n+$/, '\n') // replace trailing newlines with just a single one
.replace(/\n/gm, '\n '); // indent
var prefix = options.bulletListMarker + ' ';
var parent = node.parentNode;
if (parent.nodeName === 'OL') {
var start = parent.getAttribute('start');
var index = Array.prototype.indexOf.call(parent.children, node);
prefix = (start ? Number(start) + index : index + 1) + '. ';
}
return (
prefix + content + (node.nextSibling && !/\n$/.test(content) ? '\n' : '')
)
}
};
rules.indentedCodeBlock = {
filter: function (node, options) {
return (
options.codeBlockStyle === 'indented' &&
node.nodeName === 'PRE' &&
node.firstChild &&
node.firstChild.nodeName === 'CODE'
)
},
replacement: function (content, node, options) {
return (
'\n\n ' +
node.firstChild.textContent.replace(/\n/g, '\n ') +
'\n\n'
)
}
};
rules.fencedCodeBlock = {
filter: function (node, options) {
return (
options.codeBlockStyle === 'fenced' &&
node.nodeName === 'PRE' &&
node.firstChild &&
node.firstChild.nodeName === 'CODE'
)
},
replacement: function (content, node, options) {
var className = node.firstChild.className || '';
var language = (className.match(/language-(\S+)/) || [null, ''])[1];
var code = node.firstChild.textContent;
var fenceChar = options.fence.charAt(0);
var fenceSize = 3;
var fenceInCodeRegex = new RegExp('^' + fenceChar + '{3,}', 'gm');
var match;
while ((match = fenceInCodeRegex.exec(code))) {
if (match[0].length >= fenceSize) {
fenceSize = match[0].length + 1;
}
}
var fence = repeat(fenceChar, fenceSize);
return (
'\n\n' + fence + language + '\n' +
code.replace(/\n$/, '') +
'\n' + fence + '\n\n'
)
}
};
rules.horizontalRule = {
filter: 'hr',
replacement: function (content, node, options) {
return '\n\n' + options.hr + '\n\n'
}
};
rules.inlineLink = {
filter: function (node, options) {
return (
options.linkStyle === 'inlined' &&
node.nodeName === 'A' &&
node.getAttribute('href')
)
},
replacement: function (content, node) {
var href = node.getAttribute('href');
var title = node.title ? ' "' + node.title + '"' : '';
return '[' + content + '](' + href + title + ')'
}
};
rules.referenceLink = {
filter: function (node, options) {
return (
options.linkStyle === 'referenced' &&
node.nodeName === 'A' &&
node.getAttribute('href')
)
},
replacement: function (content, node, options) {
var href = node.getAttribute('href');
var title = node.title ? ' "' + node.title + '"' : '';
var replacement;
var reference;
switch (options.linkReferenceStyle) {
case 'collapsed':
replacement = '[' + content + '][]';
reference = '[' + content + ']: ' + href + title;
break
case 'shortcut':
replacement = '[' + content + ']';
reference = '[' + content + ']: ' + href + title;
break
default:
var id = this.references.length + 1;
replacement = '[' + content + '][' + id + ']';
reference = '[' + id + ']: ' + href + title;
}
this.references.push(reference);
return replacement
},
references: [],
append: function (options) {
var references = '';
if (this.references.length) {
references = '\n\n' + this.references.join('\n') + '\n\n';
this.references = []; // Reset references
}
return references
}
};
rules.emphasis = {
filter: ['em', 'i'],
replacement: function (content, node, options) {
if (!content.trim()) return ''
return options.emDelimiter + content + options.emDelimiter
}
};
rules.strong = {
filter: ['strong', 'b'],
replacement: function (content, node, options) {
if (!content.trim()) return ''
return options.strongDelimiter + content + options.strongDelimiter
}
};
rules.code = {
filter: function (node) {
var hasSiblings = node.previousSibling || node.nextSibling;
var isCodeBlock = node.parentNode.nodeName === 'PRE' && !hasSiblings;
return node.nodeName === 'CODE' && !isCodeBlock
},
replacement: function (content) {
if (!content.trim()) return ''
var delimiter = '`';
var leadingSpace = '';
var trailingSpace = '';
var matches = content.match(/`+/gm);
if (matches) {
if (/^`/.test(content)) leadingSpace = ' ';
if (/`$/.test(content)) trailingSpace = ' ';
while (matches.indexOf(delimiter) !== -1) delimiter = delimiter + '`';
}
return delimiter + leadingSpace + content + trailingSpace + delimiter
}
};
rules.image = {
filter: 'img',
replacement: function (content, node) {
var alt = node.alt || '';
var src = node.getAttribute('src') || '';
var title = node.title || '';
var titlePart = title ? ' "' + title + '"' : '';
return src ? '![' + alt + ']' + '(' + src + titlePart + ')' : ''
}
};
/**
* Manages a collection of rules used to convert HTML to Markdown
*/
function Rules (options) {
this.options = options;
this._keep = [];
this._remove = [];
this.blankRule = {
replacement: options.blankReplacement
};
this.keepReplacement = options.keepReplacement;
this.defaultRule = {
replacement: options.defaultReplacement
};
this.array = [];
for (var key in options.rules) this.array.push(options.rules[key]);
}
Rules.prototype = {
add: function (key, rule) {
this.array.unshift(rule);
},
keep: function (filter) {
this._keep.unshift({
filter: filter,
replacement: this.keepReplacement
});
},
remove: function (filter) {
this._remove.unshift({
filter: filter,
replacement: function () {
return ''
}
});
},
forNode: function (node) {
if (node.isBlank) return this.blankRule
var rule;
if ((rule = findRule(this.array, node, this.options))) return rule
if ((rule = findRule(this._keep, node, this.options))) return rule
if ((rule = findRule(this._remove, node, this.options))) return rule
return this.defaultRule
},
forEach: function (fn) {
for (var i = 0; i < this.array.length; i++) fn(this.array[i], i);
}
};
function findRule (rules, node, options) {
for (var i = 0; i < rules.length; i++) {
var rule = rules[i];
if (filterValue(rule, node, options)) return rule
}
return void 0
}
function filterValue (rule, node, options) {
var filter = rule.filter;
if (typeof filter === 'string') {
if (filter === node.nodeName.toLowerCase()) return true
} else if (Array.isArray(filter)) {
if (filter.indexOf(node.nodeName.toLowerCase()) > -1) return true
} else if (typeof filter === 'function') {
if (filter.call(rule, node, options)) return true
} else {
throw new TypeError('`filter` needs to be a string, array, or function')
}
}
/**
* The collapseWhitespace function is adapted from collapse-whitespace
* by Luc Thevenard.
*
* The MIT License (MIT)
*
* Copyright (c) 2014 Luc Thevenard <lucthevenard@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/**
* collapseWhitespace(options) removes extraneous whitespace from an the given element.
*
* @param {Object} options
*/
function collapseWhitespace (options) {
var element = options.element;
var isBlock = options.isBlock;
var isVoid = options.isVoid;
var isPre = options.isPre || function (node) {
return node.nodeName === 'PRE'
};
if (!element.firstChild || isPre(element)) return
var prevText = null;
var prevVoid = false;
var prev = null;
var node = next(prev, element, isPre);
while (node !== element) {
if (node.nodeType === 3 || node.nodeType === 4) { // Node.TEXT_NODE or Node.CDATA_SECTION_NODE
var text = node.data.replace(/[ \r\n\t]+/g, ' ');
if ((!prevText || / $/.test(prevText.data)) &&
!prevVoid && text[0] === ' ') {
text = text.substr(1);
}
// `text` might be empty at this point.
if (!text) {
node = remove(node);
continue
}
node.data = text;
prevText = node;
} else if (node.nodeType === 1) { // Node.ELEMENT_NODE
if (isBlock(node) || node.nodeName === 'BR') {
if (prevText) {
prevText.data = prevText.data.replace(/ $/, '');
}
prevText = null;
prevVoid = false;
} else if (isVoid(node)) {
// Avoid trimming space around non-block, non-BR void elements.
prevText = null;
prevVoid = true;
}
} else {
node = remove(node);
continue
}
var nextNode = next(prev, node, isPre);
prev = node;
node = nextNode;
}
if (prevText) {
prevText.data = prevText.data.replace(/ $/, '');
if (!prevText.data) {
remove(prevText);
}
}
}
/**
* remove(node) removes the given node from the DOM and returns the
* next node in the sequence.
*
* @param {Node} node
* @return {Node} node
*/
function remove (node) {
var next = node.nextSibling || node.parentNode;
node.parentNode.removeChild(node);
return next
}
/**
* next(prev, current, isPre) returns the next node in the sequence, given the
* current and previous nodes.
*
* @param {Node} prev
* @param {Node} current
* @param {Function} isPre
* @return {Node}
*/
function next (prev, current, isPre) {
if ((prev && prev.parentNode === current) || isPre(current)) {
return current.nextSibling || current.parentNode
}
return current.firstChild || current.nextSibling || current.parentNode
}
/*
* Set up window for Node.js
*/
var root = (typeof window !== 'undefined' ? window : {});
/*
* Parsing HTML strings
*/
function canParseHTMLNatively () {
var Parser = root.DOMParser;
var canParse = false;
// Adapted from https://gist.github.com/1129031
// Firefox/Opera/IE throw errors on unsupported types
try {
// WebKit returns null on unsupported types
if (new Parser().parseFromString('', 'text/html')) {
canParse = true;
}
} catch (e) {}
return canParse
}
function createHTMLParser () {
var Parser = function () {};
{
var JSDOM = require('jsdom').JSDOM;
Parser.prototype.parseFromString = function (string) {
return new JSDOM(string).window.document
};
}
return Parser
}
var HTMLParser = canParseHTMLNatively() ? root.DOMParser : createHTMLParser();
function RootNode (input) {
var root;
if (typeof input === 'string') {
var doc = htmlParser().parseFromString(
// DOM parsers arrange elements in the <head> and <body>.
// Wrapping in a custom element ensures elements are reliably arranged in
// a single element.
'<x-turndown id="turndown-root">' + input + '</x-turndown>',
'text/html'
);
root = doc.getElementById('turndown-root');
} else {
root = input.cloneNode(true);
}
collapseWhitespace({
element: root,
isBlock: isBlock,
isVoid: isVoid
});
return root
}
var _htmlParser;
function htmlParser () {
_htmlParser = _htmlParser || new HTMLParser();
return _htmlParser
}
function Node (node) {
node.isBlock = isBlock(node);
node.isCode = node.nodeName.toLowerCase() === 'code' || node.parentNode.isCode;
node.isBlank = isBlank(node);
node.flankingWhitespace = flankingWhitespace(node);
return node
}
function isBlank (node) {
return (
['A', 'TH', 'TD', 'IFRAME', 'SCRIPT', 'AUDIO', 'VIDEO'].indexOf(node.nodeName) === -1 &&
/^\s*$/i.test(node.textContent) &&
!isVoid(node) &&
!hasVoid(node)
)
}
function flankingWhitespace (node) {
var leading = '';
var trailing = '';
if (!node.isBlock) {
var hasLeading = /^\s/.test(node.textContent);
var hasTrailing = /\s$/.test(node.textContent);
var blankWithSpaces = node.isBlank && hasLeading && hasTrailing;
if (hasLeading && !isFlankedByWhitespace('left', node)) {
leading = ' ';
}
if (!blankWithSpaces && hasTrailing && !isFlankedByWhitespace('right', node)) {
trailing = ' ';
}
}
return { leading: leading, trailing: trailing }
}
function isFlankedByWhitespace (side, node) {
var sibling;
var regExp;
var isFlanked;
if (side === 'left') {
sibling = node.previousSibling;
regExp = / $/;
} else {
sibling = node.nextSibling;
regExp = /^ /;
}
if (sibling) {
if (sibling.nodeType === 3) {
isFlanked = regExp.test(sibling.nodeValue);
} else if (sibling.nodeType === 1 && !isBlock(sibling)) {
isFlanked = regExp.test(sibling.textContent);
}
}
return isFlanked
}
var reduce = Array.prototype.reduce;
var leadingNewLinesRegExp = /^\n*/;
var trailingNewLinesRegExp = /\n*$/;
var escapes = [
[/\\/g, '\\\\'],
[/\*/g, '\\*'],
[/^-/g, '\\-'],
[/^\+ /g, '\\+ '],
[/^(=+)/g, '\\$1'],
[/^(#{1,6}) /g, '\\$1 '],
[/`/g, '\\`'],
[/^~~~/g, '\\~~~'],
[/\[/g, '\\['],
[/\]/g, '\\]'],
[/^>/g, '\\>'],
[/_/g, '\\_'],
[/^(\d+)\. /g, '$1\\. ']
];
function TurndownService (options) {
if (!(this instanceof TurndownService)) return new TurndownService(options)
var defaults = {
rules: rules,
headingStyle: 'setext',
hr: '* * *',
bulletListMarker: '*',
codeBlockStyle: 'indented',
fence: '```',
emDelimiter: '_',
strongDelimiter: '**',
linkStyle: 'inlined',
linkReferenceStyle: 'full',
br: ' ',
blankReplacement: function (content, node) {
return node.isBlock ? '\n\n' : ''
},
keepReplacement: function (content, node) {
return node.isBlock ? '\n\n' + node.outerHTML + '\n\n' : node.outerHTML
},
defaultReplacement: function (content, node) {
return node.isBlock ? '\n\n' + content + '\n\n' : content
}
};
this.options = extend({}, defaults, options);
this.rules = new Rules(this.options);
}
TurndownService.prototype = {
/**
* The entry point for converting a string or DOM node to Markdown
* @public
* @param {String|HTMLElement} input The string or DOM node to convert
* @returns A Markdown representation of the input
* @type String
*/
turndown: function (input) {
if (!canConvert(input)) {
throw new TypeError(
input + ' is not a string, or an element/document/fragment node.'
)
}
if (input === '') return ''
var output = process.call(this, new RootNode(input));
return postProcess.call(this, output)
},
/**
* Add one or more plugins
* @public
* @param {Function|Array} plugin The plugin or array of plugins to add
* @returns The Turndown instance for chaining
* @type Object
*/
use: function (plugin) {
if (Array.isArray(plugin)) {
for (var i = 0; i < plugin.length; i++) this.use(plugin[i]);
} else if (typeof plugin === 'function') {
plugin(this);
} else {
throw new TypeError('plugin must be a Function or an Array of Functions')
}
return this
},
/**
* Adds a rule
* @public
* @param {String} key The unique key of the rule
* @param {Object} rule The rule
* @returns The Turndown instance for chaining
* @type Object
*/
addRule: function (key, rule) {
this.rules.add(key, rule);
return this
},
/**
* Keep a node (as HTML) that matches the filter
* @public
* @param {String|Array|Function} filter The unique key of the rule
* @returns The Turndown instance for chaining
* @type Object
*/
keep: function (filter) {
this.rules.keep(filter);
return this
},
/**
* Remove a node that matches the filter
* @public
* @param {String|Array|Function} filter The unique key of the rule
* @returns The Turndown instance for chaining
* @type Object
*/
remove: function (filter) {
this.rules.remove(filter);
return this
},
/**
* Escapes Markdown syntax
* @public
* @param {String} string The string to escape
* @returns A string with Markdown syntax escaped
* @type String
*/
escape: function (string) {
return escapes.reduce(function (accumulator, escape) {
return accumulator.replace(escape[0], escape[1])
}, string)
}
};
/**
* Reduces a DOM node down to its Markdown string equivalent
* @private
* @param {HTMLElement} parentNode The node to convert
* @returns A Markdown representation of the node
* @type String
*/
function process (parentNode) {
var self = this;
return reduce.call(parentNode.childNodes, function (output, node) {
node = new Node(node);
var replacement = '';
if (node.nodeType === 3) {
replacement = node.isCode ? node.nodeValue : self.escape(node.nodeValue);
} else if (node.nodeType === 1) {
replacement = replacementForNode.call(self, node);
}
return join(output, replacement)
}, '')
}
/**
* Appends strings as each rule requires and trims the output
* @private
* @param {String} output The conversion output
* @returns A trimmed version of the ouput
* @type String
*/
function postProcess (output) {
var self = this;
this.rules.forEach(function (rule) {
if (typeof rule.append === 'function') {
output = join(output, rule.append(self.options));
}
});
return output.replace(/^[\t\r\n]+/, '').replace(/[\t\r\n\s]+$/, '')
}
/**
* Converts an element node to its Markdown equivalent
* @private
* @param {HTMLElement} node The node to convert
* @returns A Markdown representation of the node
* @type String
*/
function replacementForNode (node) {
var rule = this.rules.forNode(node);
var content = process.call(this, node);
var whitespace = node.flankingWhitespace;
if (whitespace.leading || whitespace.trailing) content = content.trim();
return (
whitespace.leading +
rule.replacement(content, node, this.options) +
whitespace.trailing
)
}
/**
* Determines the new lines between the current output and the replacement
* @private
* @param {String} output The current conversion output
* @param {String} replacement The string to append to the output
* @returns The whitespace to separate the current output and the replacement
* @type String
*/
function separatingNewlines (output, replacement) {
var newlines = [
output.match(trailingNewLinesRegExp)[0],
replacement.match(leadingNewLinesRegExp)[0]
].sort();
var maxNewlines = newlines[newlines.length - 1];
return maxNewlines.length < 2 ? maxNewlines : '\n\n'
}
function join (string1, string2) {
var separator = separatingNewlines(string1, string2);
// Remove trailing/leading newlines and replace with separator
string1 = string1.replace(trailingNewLinesRegExp, '');
string2 = string2.replace(leadingNewLinesRegExp, '');
return string1 + separator + string2
}
/**
* Determines whether an input can be converted
* @private
* @param {String|HTMLElement} input Describe this parameter
* @returns Describe what it returns
* @type String|Object|Array|Boolean|Number
*/
function canConvert (input) {
return (
input != null && (
typeof input === 'string' ||
(input.nodeType && (
input.nodeType === 1 || input.nodeType === 9 || input.nodeType === 11
))
)
)
}
/*
*
* Embed @tehshrike/readability@0.2.0 to work around content security policies breaking import statements
*
*/
/*
* 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;
let logEl;
// Control whether log messages are sent to the console
if (this._debug) {
logEl = function(e) {
const rv = e.nodeName + " ";
if (e.nodeType == e.TEXT_NODE) {
return rv + '("' + e.textContent + '")';
}
const classDesc = e.className && ("." + e.className.replace(/ /g, "."));
let elDesc = "";
if (e.id) {
elDesc = "(#" + e.id + classDesc + ")";
} else if (classDesc) {
elDesc = "(" + classDesc + ")";
}
return rv + elDesc;
};
this.log = function() {
if (typeof dump !== "undefined") {
const msg = Array.prototype.map.call(arguments, x => (x && x.nodeName) ? logEl(x) : x).join(" ");
dump("Reader: (Readability) " + msg + "\n");
} else if (typeof console !== "undefined") {
const 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(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(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 (let i = nodeList.length - 1; i >= 0; i--) {
const node = nodeList[i];
const 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(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 (let i = nodeList.length - 1; i >= 0; i--) {
const 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(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(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(nodeList, fn) {
return Array.prototype.every.call(nodeList, fn, this);
},
/**
* Concat all nodelists passed as arguments.
*
* @return ...NodeList
* @return Array
*/
_concatNodeLists() {
const slice = Array.prototype.slice;
const args = slice.call(arguments);
const nodeLists = args.map(list => slice.call(list));
return Array.prototype.concat.apply([], nodeLists);
},
_getAllNodesWithTag(node, tagNames) {
if (node.querySelectorAll) {
return node.querySelectorAll(tagNames.join(","));
}
return [].concat.apply([], tagNames.map(tag => {
const 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(node) {
const classesToPreserve = this._classesToPreserve;
const className = (node.getAttribute("class") || "")
.split(/\s+/)
.filter(cls => 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 <a> and <img> uri in the given element to an absolute URI,
* ignoring #ref URIs.
*
* @param Element
* @return void
*/
_fixRelativeUris(articleContent) {
const baseURI = this._doc.baseURI;
const 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;
}
const links = this._getAllNodesWithTag(articleContent, [ "a" ]);
this._forEachNode(links, function(link) {
const 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) {
const text = this._doc.createTextNode(link.textContent);
link.parentNode.replaceChild(text, link);
} else {
// if the link has multiple children, they should all be preserved
const 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));
}
}
});
const medias = this._getAllNodesWithTag(articleContent, [
"img", "picture", "figure", "video", "audio", "source",
]);
this._forEachNode(medias, function(media) {
const src = media.getAttribute("src");
const poster = media.getAttribute("poster");
const srcset = media.getAttribute("srcset");
if (src) {
media.setAttribute("src", toAbsoluteURI(src));
}
if (poster) {
media.setAttribute("poster", toAbsoluteURI(poster));
}
if (srcset) {
const newSrcset = srcset.replace(this.REGEXPS.srcsetUrl, (_, p1, p2, p3) => toAbsoluteURI(p1) + (p2 || "") + p3);
media.setAttribute("srcset", newSrcset);
}
});
},
/**
* Get the article title as an H1.
*
* @return void
**/
_getArticleTitle() {
const doc = this._doc;
let curTitle = "";
let 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. */ }
let 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.
const headings = this._concatNodeLists(
doc.getElementsByTagName("h1"),
doc.getElementsByTagName("h2"),
);
const trimmedTitle = curTitle.trim();
const match = this._someNode(headings, heading => 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) {
const 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.
const 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() {
const 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(node) {
let 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 <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(elem) {
this._forEachNode(this._getAllNodesWithTag(elem, [ "br" ]), function(br) {
let next = br.nextSibling;
// Whether 2 or more <br> elements have been found and replaced with a
// <p> block.
let 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;
const 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) {
const 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") {
const 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 <p>.
const 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(node, tag) {
this.log("_setNodeTag", node, tag);
if (this._docJSDOMParser) {
node.localName = tag.toLowerCase();
node.tagName = tag.toUpperCase();
return node;
}
const 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 (let 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 <p> tags, etc.
*
* @param Element
* @return void
**/
_prepArticle(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".
const 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.
const h2 = articleContent.getElementsByTagName("h2");
if (h2.length === 1) {
const lengthSimilarRate = (h2[0].textContent.length - this._articleTitle.length) / this._articleTitle.length;
if (Math.abs(lengthSimilarRate) < 0.5) {
let 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) {
const imgCount = paragraph.getElementsByTagName("img").length;
const embedCount = paragraph.getElementsByTagName("embed").length;
const objectCount = paragraph.getElementsByTagName("object").length;
// At this point, nasty iframes have been removed, only remain embedded video ones.
const iframeCount = paragraph.getElementsByTagName("iframe").length;
const totalCount = imgCount + embedCount + objectCount + iframeCount;
return totalCount === 0 && !this._getInnerText(paragraph, false);
});
this._forEachNode(this._getAllNodesWithTag(articleContent, [ "br" ]), function(br) {
const 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) {
const tbody = this._hasSingleTagInsideElement(table, "TBODY") ? table.firstElementChild : table;
if (this._hasSingleTagInsideElement(tbody, "TR")) {
const row = tbody.firstElementChild;
if (this._hasSingleTagInsideElement(row, "TD")) {
let 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(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(node) {
const 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(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(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(node, maxDepth) {
maxDepth = maxDepth || 0;
let 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(page) {
this.log("**** grabArticle ****");
const doc = this._doc;
const isPaging = (page !== null);
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;
}
const pageCacheHtml = page.innerHTML;
while (true) {
const 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.)
const elementsToScore = [];
let node = this._doc.documentElement;
while (node) {
const 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.
let p = null;
let childNode = node.firstChild;
while (childNode) {
const 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) {
const 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.
const innerText = this._getInnerText(elementToScore);
if (innerText.length < 25) {
return;
}
// Exclude nodes with no ancestor.
const ancestors = this._getNodeAncestors(elementToScore, 3);
if (ancestors.length === 0) {
return;
}
let 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.
const topCandidates = [];
for (let c = 0, cl = candidates.length; c < cl; c += 1) {
const 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.
const candidateScore = candidate.readability.contentScore * (1 - this._getLinkDensity(candidate));
candidate.readability.contentScore = candidateScore;
this.log("Candidate:", candidate, "with score " + candidateScore);
for (let t = 0; t < this._nbTopCandidates; t++) {
const aTopCandidate = topCandidates[t];
if (!aTopCandidate || candidateScore > aTopCandidate.readability.contentScore) {
topCandidates.splice(t, 0, candidate);
if (topCandidates.length > this._nbTopCandidates) {
topCandidates.pop();
}
break;
}
}
}
let topCandidate = topCandidates[0] || null;
let 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:
const 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.
const alternativeCandidateAncestors = [];
for (let i = 1; i < topCandidates.length; i++) {
if (topCandidates[i].readability.contentScore / topCandidate.readability.contentScore >= 0.75) {
alternativeCandidateAncestors.push(this._getNodeAncestors(topCandidates[i]));
}
}
const MINIMUM_TOPCANDIDATES = 3;
if (alternativeCandidateAncestors.length >= MINIMUM_TOPCANDIDATES) {
parentOfTopCandidate = topCandidate.parentNode;
while (parentOfTopCandidate.tagName !== "BODY") {
let listsContainingThisAncestor = 0;
for (let 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;
let lastScore = topCandidate.readability.contentScore;
// The scores shouldn't get too low.
const scoreThreshold = lastScore / 3;
while (parentOfTopCandidate.tagName !== "BODY") {
if (!parentOfTopCandidate.readability) {
parentOfTopCandidate = parentOfTopCandidate.parentNode;
continue;
}
const 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.
let articleContent = doc.createElement("DIV");
if (isPaging) {
articleContent.id = "readability-content";
}
const 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;
const siblings = parentOfTopCandidate.children;
for (let s = 0, sl = siblings.length; s < sl; s++) {
let sibling = siblings[s];
let 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 {
let 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") {
const linkDensity = this._getLinkDensity(sibling);
const nodeContent = this._getInnerText(sibling);
const 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 {
const div = doc.createElement("DIV");
div.id = "readability-page-1";
div.className = "page";
const children = articleContent.childNodes;
while (children.length) {
div.appendChild(children[0]);
}
articleContent.appendChild(div);
}
if (this._debug) {
this.log("Article content after paging: " + articleContent.innerHTML);
}
let 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.
const 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, textLength });
} else if (this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) {
this._removeFlag(this.FLAG_WEIGHT_CLASSES);
this._attempts.push({ articleContent, textLength });
} else if (this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) {
this._removeFlag(this.FLAG_CLEAN_CONDITIONALLY);
this._attempts.push({ articleContent, textLength });
} else {
this._attempts.push({ articleContent, textLength });
// No luck after removing flags, just return the longest text we found during the different loops
this._attempts.sort((a, b) => 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.
const ancestors = [ parentOfTopCandidate, topCandidate ].concat(this._getNodeAncestors(parentOfTopCandidate));
this._someNode(ancestors, function(ancestor) {
if (!ancestor.tagName) {
return false;
}
const 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(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(str) {
if (!str) {
return str;
}
const htmlEscapeMap = this.HTML_ESCAPE_MAP;
return str.replace(/&(quot|amp|apos|lt|gt);/g, (_, tag) => htmlEscapeMap[tag]).replace(/&#(?:x([0-9a-z]{1,4})|([0-9]{1,4}));/gi, (_, hex, numStr) => {
const 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() {
const metadata = {};
const values = {};
const metaElements = this._doc.getElementsByTagName("meta");
// property is a space-separated list of values
const propertyPattern = /\s*(dc|dcterm|og|twitter)\s*:\s*(author|creator|description|title|site_name)\s*/gi;
// name is a single value
const 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, element => {
const elementName = element.getAttribute("name");
const elementProperty = element.getAttribute("property");
const content = element.getAttribute("content");
if (!content) {
return;
}
let matches = null;
let name = null;
if (elementProperty) {
matches = elementProperty.match(propertyPattern);
if (matches) {
for (let 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(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 <noscript> that are located after <img> nodes, and which contain only one
* <img> element. Replace the first image with the image from inside the <noscript> tag,
* and remove the <noscript> tag. This improves the quality of the images we use on
* some sites (e.g. Medium).
*
* @param Element
**/
_unwrapNoscriptImages(doc) {
// Find img without source or attributes that might contains image, and remove it.
// This is done to prevent a placeholder img is replaced by img from noscript in next step.
const imgs = Array.from(doc.getElementsByTagName("img"));
this._forEachNode(imgs, img => {
for (let i = 0; i < img.attributes.length; i++) {
const attr = img.attributes[i];
switch (attr.name) {
case "src":
case "srcset":
case "data-src":
case "data-srcset":
return;
}
if (/\.(jpg|jpeg|png|webp)/i.test(attr.value)) {
return;
}
}
img.parentNode.removeChild(img);
});
// Next find noscript and try to extract its image
const noscripts = Array.from(doc.getElementsByTagName("noscript"));
this._forEachNode(noscripts, function(noscript) {
// Parse content of noscript and make sure it only contains image
const tmp = doc.createElement("div");
tmp.innerHTML = noscript.innerHTML;
if (!this._isSingleImage(tmp)) {
return;
}
// If noscript has previous sibling and it only contains image,
// replace it with noscript content. However we also keep old
// attributes that might contains image.
const prevElement = noscript.previousElementSibling;
if (prevElement && this._isSingleImage(prevElement)) {
let prevImg = prevElement;
if (prevImg.tagName !== "IMG") {
prevImg = prevElement.getElementsByTagName("img")[0];
}
const newImg = tmp.getElementsByTagName("img")[0];
for (let i = 0; i < prevImg.attributes.length; i++) {
const attr = prevImg.attributes[i];
if (attr.value === "") {
continue;
}
if (attr.name === "src" || attr.name === "srcset" || /\.(jpg|jpeg|png|webp)/i.test(attr.value)) {
if (newImg.getAttribute(attr.name) === attr.value) {
continue;
}
let attrName = attr.name;
if (newImg.hasAttribute(attrName)) {
attrName = "data-old-" + attrName;
}
newImg.setAttribute(attrName, attr.value);
}
}
noscript.parentNode.replaceChild(tmp.firstElementChild, prevElement);
}
});
},
/**
* Removes script tags from the document.
*
* @param Element
**/
_removeScripts(doc) {
this._removeNodes(this._getAllNodesWithTag(doc, [ "script" ]), scriptNode => {
scriptNode.nodeValue = "";
scriptNode.removeAttribute("src");
return true;
});
this._removeNodes(this._getAllNodesWithTag(doc, [ "noscript" ]));
},
/**
* Check if this node has only whitespace and a single element with given tag
* Returns false if the DIV node contains non-empty text nodes
* or if it contains no element with given tag or more than 1 element.
*
* @param Element
* @param string tag of child element
**/
_hasSingleTagInsideElement(element, tag) {
// There should be exactly 1 element child with given tag
if (element.children.length != 1 || element.children[0].tagName !== tag) {
return false;
}
// And there should be no text nodes with real content
return !this._someNode(element.childNodes, function(node) {
return node.nodeType === this.TEXT_NODE
&& this.REGEXPS.hasContent.test(node.textContent);
});
},
_isElementWithoutContent(node) {
return node.nodeType === this.ELEMENT_NODE
&& node.textContent.trim().length == 0
&& (node.children.length == 0
|| node.children.length == node.getElementsByTagName("br").length + node.getElementsByTagName("hr").length);
},
/**
* Determine whether element has any children block level elements.
*
* @param Element
*/
_hasChildBlockElement(element) {
return this._someNode(element.childNodes, function(node) {
return this.DIV_TO_P_ELEMS.indexOf(node.tagName) !== -1
|| this._hasChildBlockElement(node);
});
},
/** *
* Determine if a node qualifies as phrasing content.
* https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories#Phrasing_content
**/
_isPhrasingContent(node) {
return node.nodeType === this.TEXT_NODE || this.PHRASING_ELEMS.indexOf(node.tagName) !== -1
|| ((node.tagName === "A" || node.tagName === "DEL" || node.tagName === "INS")
&& this._everyNode(node.childNodes, this._isPhrasingContent));
},
_isWhitespace(node) {
return (node.nodeType === this.TEXT_NODE && node.textContent.trim().length === 0)
|| (node.nodeType === this.ELEMENT_NODE && node.tagName === "BR");
},
/**
* 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(e, normalizeSpaces) {
normalizeSpaces = (typeof normalizeSpaces === "undefined") ? true : normalizeSpaces;
const 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(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(e) {
if (!e || e.tagName.toLowerCase() === "svg") {
return;
}
// Remove `style` and deprecated presentational attributes
for (let i = 0; i < this.PRESENTATIONAL_ATTRIBUTES.length; i++) {
e.removeAttribute(this.PRESENTATIONAL_ATTRIBUTES[i]);
}
if (this.DEPRECATED_SIZE_ATTRIBUTE_ELEMS.indexOf(e.tagName) !== -1) {
e.removeAttribute("width");
e.removeAttribute("height");
}
let cur = e.firstElementChild;
while (cur !== null) {
this._cleanStyles(cur);
cur = cur.nextElementSibling;
}
},
/**
* 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(element) {
const textLength = this._getInnerText(element).length;
if (textLength === 0) {
return 0;
}
let linkLength = 0;
// XXX implement _reduceNodeList?
this._forEachNode(element.getElementsByTagName("a"), function(linkNode) {
linkLength += this._getInnerText(linkNode).length;
});
return linkLength / textLength;
},
/**
* Get an elements class/id weight. Uses regular expressions to tell if this
* element looks good or bad.
*
* @param Element
* @return number (Integer)
**/
_getClassWeight(e) {
if (!this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) {
return 0;
}
let 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(e, tag) {
const isEmbed = [ "object", "embed", "iframe" ].indexOf(tag) !== -1;
this._removeNodes(this._getAllNodesWithTag(e, [ tag ]), function(element) {
// Allow youtube and vimeo videos through as people usually want to see those.
if (isEmbed) {
// First, check the elements attributes to see if any of them contain youtube or vimeo
for (let i = 0; i < element.attributes.length; i++) {
if (this.REGEXPS.videos.test(element.attributes[i].value)) {
return false;
}
}
// For embed with <object> tag, check inner HTML as well.
if (element.tagName === "object" && 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
* @param Function filterFn a filter to invoke to determine whether this node 'counts'
* @return Boolean
*/
_hasAncestorTag(node, tagName, maxDepth, filterFn) {
maxDepth = maxDepth || 3;
tagName = tagName.toUpperCase();
let depth = 0;
while (node.parentNode) {
if (maxDepth > 0 && depth > maxDepth) {
return false;
}
if (node.parentNode.tagName === tagName && (!filterFn || filterFn(node.parentNode))) {
return true;
}
node = node.parentNode;
depth++;
}
return false;
},
/**
* Return an object indicating how many rows and columns this table has.
*/
_getRowAndColumnCount(table) {
let rows = 0;
let columns = 0;
const trs = table.getElementsByTagName("tr");
for (let i = 0; i < trs.length; i++) {
let rowspan = trs[i].getAttribute("rowspan") || 0;
if (rowspan) {
rowspan = parseInt(rowspan, 10);
}
rows += (rowspan || 1);
// Now look for column-related info
let columnsInThisRow = 0;
const cells = trs[i].getElementsByTagName("td");
for (let j = 0; j < cells.length; j++) {
let colspan = cells[j].getAttribute("colspan") || 0;
if (colspan) {
colspan = parseInt(colspan, 10);
}
columnsInThisRow += (colspan || 1);
}
columns = Math.max(columns, columnsInThisRow);
}
return { rows, columns };
},
/**
* Look for 'data' (as opposed to 'layout') tables, for which we use
* similar checks as
* https://dxr.mozilla.org/mozilla-central/rev/71224049c0b52ab190564d3ea0eab089a159a4cf/accessible/html/HTMLTableAccessible.cpp#920
*/
_markDataTables(root) {
const tables = root.getElementsByTagName("table");
for (let i = 0; i < tables.length; i++) {
var table = tables[i];
const role = table.getAttribute("role");
if (role == "presentation") {
table._readabilityDataTable = false;
continue;
}
const datatable = table.getAttribute("datatable");
if (datatable == "0") {
table._readabilityDataTable = false;
continue;
}
const summary = table.getAttribute("summary");
if (summary) {
table._readabilityDataTable = true;
continue;
}
const caption = table.getElementsByTagName("caption")[0];
if (caption && caption.childNodes.length > 0) {
table._readabilityDataTable = true;
continue;
}
// If the table has a descendant with any of these tags, consider a data table:
const dataTableDescendants = [ "col", "colgroup", "tfoot", "thead", "th" ];
const descendantExists = function(tag) {
return !!table.getElementsByTagName(tag)[0];
};
if (dataTableDescendants.some(descendantExists)) {
this.log("Data table because found data-y descendant");
table._readabilityDataTable = true;
continue;
}
// Nested tables indicate a layout table:
if (table.getElementsByTagName("table")[0]) {
table._readabilityDataTable = false;
continue;
}
const sizeInfo = this._getRowAndColumnCount(table);
if (sizeInfo.rows >= 10 || sizeInfo.columns > 4) {
table._readabilityDataTable = true;
continue;
}
// Now just go by size entirely:
table._readabilityDataTable = sizeInfo.rows * sizeInfo.columns > 10;
}
},
/* convert images and figures that have properties like data-src into images that can be loaded without JS */
_fixLazyImages(root) {
this._forEachNode(this._getAllNodesWithTag(root, [ "img", "picture", "figure" ]), function(elem) {
// In some sites (e.g. Kotaku), they put 1px square image as base64 data uri in the src attribute.
// So, here we check if the data uri is too short, just might as well remove it.
if (elem.src && this.REGEXPS.b64DataUrl.test(elem.src)) {
// Make sure it's not SVG, because SVG can have a meaningful image in under 133 bytes.
const parts = this.REGEXPS.b64DataUrl.exec(elem.src);
if (parts[1] === "image/svg+xml") {
return;
}
// Make sure this element has other attributes which contains image.
// If it doesn't, then this src is important and shouldn't be removed.
let srcCouldBeRemoved = false;
for (let i = 0; i < elem.attributes.length; i++) {
var attr = elem.attributes[i];
if (attr.name === "src") {
continue;
}
if (/\.(jpg|jpeg|png|webp)/i.test(attr.value)) {
srcCouldBeRemoved = true;
break;
}
}
// Here we assume if image is less than 100 bytes (or 133B after encoded to base64)
// it will be too small, therefore it might be placeholder image.
if (srcCouldBeRemoved) {
const b64starts = elem.src.search(/base64\s*/i) + 7;
const b64length = elem.src.length - b64starts;
if (b64length < 133) {
elem.removeAttribute("src");
}
}
}
// also check for "null" to work around https://github.com/jsdom/jsdom/issues/2580
if ((elem.src || (elem.srcset && elem.srcset != "null")) && elem.className.toLowerCase().indexOf("lazy") === -1) {
return;
}
for (let j = 0; j < elem.attributes.length; j++) {
attr = elem.attributes[j];
if (attr.name === "src" || attr.name === "srcset") {
continue;
}
let copyTo = null;
if (/\.(jpg|jpeg|png|webp)\s+\d/.test(attr.value)) {
copyTo = "srcset";
} else if (/^\s*\S+\.(jpg|jpeg|png|webp)\S*\s*$/.test(attr.value)) {
copyTo = "src";
}
if (copyTo) {
// if this is an img or picture, set the attribute directly
if (elem.tagName === "IMG" || elem.tagName === "PICTURE") {
elem.setAttribute(copyTo, attr.value);
} else if (elem.tagName === "FIGURE" && !this._getAllNodesWithTag(elem, [ "img", "picture" ]).length) {
// if the item is a <figure> that does not contain an image or picture, create one and place it inside the figure
// see the nytimes-3 testcase for an example
const img = this._doc.createElement("img");
img.setAttribute(copyTo, attr.value);
elem.appendChild(img);
}
}
}
});
},
/**
* 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(e, tag) {
if (!this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) {
return;
}
const 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(this._getAllNodesWithTag(e, [ tag ]), function(node) {
// First check if this node IS data table, in which case don't remove it.
const isDataTable = function(t) {
return t._readabilityDataTable;
};
if (tag === "table" && isDataTable(node)) {
return false;
}
// Next check if we're inside a data table, in which case don't remove it as well.
if (this._hasAncestorTag(node, "table", -1, isDataTable)) {
return false;
}
const weight = this._getClassWeight(node);
const 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.
const p = node.getElementsByTagName("p").length;
const img = node.getElementsByTagName("img").length;
const li = node.getElementsByTagName("li").length - 100;
const input = node.getElementsByTagName("input").length;
let embedCount = 0;
const embeds = this._getAllNodesWithTag(node, [ "object", "embed", "iframe" ]);
for (let i = 0; i < embeds.length; i++) {
// If this embed has attribute that matches video regex, don't delete it.
for (let j = 0; j < embeds[i].attributes.length; j++) {
if (this.REGEXPS.videos.test(embeds[i].attributes[j].value)) {
return false;
}
}
// For embed with <object> tag, check inner HTML as well.
if (embeds[i].tagName === "object" && this.REGEXPS.videos.test(embeds[i].innerHTML)) {
return false;
}
embedCount++;
}
const linkDensity = this._getLinkDensity(node);
const contentLength = this._getInnerText(node).length;
const haveToRemove
= (img > 1 && p / img < 0.5 && !this._hasAncestorTag(node, "figure"))
|| (!isList && li > p)
|| (input > Math.floor(p / 3))
|| (!isList && contentLength < 25 && (img === 0 || img > 2) && !this._hasAncestorTag(node, "figure"))
|| (!isList && weight < 25 && linkDensity > 0.2)
|| (weight >= 25 && linkDensity > 0.5)
|| ((embedCount === 1 && contentLength < 75) || embedCount > 1);
return haveToRemove;
}
return false;
});
},
/**
* Clean out elements that match the specified conditions
*
* @param Element
* @param Function determines whether a node should be removed
* @return void
**/
_cleanMatchedNodes(e, filter) {
const endOfSearchMarkerNode = this._getNextNode(e, true);
let next = this._getNextNode(e);
while (next && next != endOfSearchMarkerNode) {
if (filter.call(this, next, next.className + " " + next.id)) {
next = this._removeAndGetNext(next);
} else {
next = this._getNextNode(next);
}
}
},
/**
* Clean out spurious headers from an Element. Checks things like classnames and link density.
*
* @param Element
* @return void
**/
_cleanHeaders(e) {
this._removeNodes(this._getAllNodesWithTag(e, [ "h1", "h2" ]), function(header) {
return this._getClassWeight(header) < 0;
});
},
_flagIsActive(flag) {
return (this._flags & flag) > 0;
},
_removeFlag(flag) {
this._flags = this._flags & ~flag;
},
_isProbablyVisible(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));
},
/**
* 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() {
// Avoid parsing too large documents, as per configuration option
if (this._maxElemsToParse > 0) {
const numTags = this._doc.getElementsByTagName("*").length;
if (numTags > this._maxElemsToParse) {
throw new Error("Aborting parsing document; " + numTags + " elements found");
}
}
// Unwrap image from noscript
this._unwrapNoscriptImages(this._doc);
// Remove script tags from the document.
this._removeScripts(this._doc);
this._prepDocument();
const metadata = this._getArticleMetadata();
this._articleTitle = metadata.title;
const articleContent = this._grabArticle();
if (!articleContent) {
return null;
}
this.log("Grabbed: " + articleContent.innerHTML);
this._postProcessContent(articleContent);
// 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) {
const paragraphs = articleContent.getElementsByTagName("p");
if (paragraphs.length > 0) {
metadata.excerpt = paragraphs[0].textContent.trim();
}
}
const textContent = articleContent.textContent;
return {
title: this._articleTitle,
byline: metadata.byline || this._articleByline,
dir: this._articleDir,
content: articleContent.innerHTML,
textContent,
length: textContent.length,
excerpt: metadata.excerpt,
siteName: metadata.siteName || this._articleSiteName,
};
},
};
/*
*
* Send to Obsidian
*
*/
/* parse and lightly clean the site's meta keywords content into tags, if present */
if (document.querySelector('meta[name="keywords" i]')) {
var keywords = document.querySelector('meta[name="keywords" i]').getAttribute('content').split(',');
keywords.forEach(function (keyword) {
let tag = ' ' + keyword.split(' ').join('');
tags += tag;
});
}
function getSelectionHtml() {
var html = "";
if (typeof window.getSelection != "undefined") {
var sel = window.getSelection();
if (sel.rangeCount) {
var container = document.createElement("div");
for (var i = 0, len = sel.rangeCount; i < len; ++i) {
container.appendChild(sel.getRangeAt(i).cloneContents());
}
html = container.innerHTML;
}
} else if (typeof document.selection != "undefined") {
if (document.selection.type == "Text") {
html = document.selection.createRange().htmlText;
}
}
return html;
}
const selection = getSelectionHtml();
const {
title,
byline,
content
} = new Readability(document.cloneNode(true)).parse();
function getFileName(fileName) {
var userAgent = window.navigator.userAgent,
platform = window.navigator.platform,
windowsPlatforms = ['Win32', 'Win64', 'Windows', 'WinCE'];
if (windowsPlatforms.indexOf(platform) !== -1) {
fileName = fileName.replace(':', '').replace(/[/\\?%*|"<>]/g, '-');
} else {
fileName = fileName.replace(/:/g, '').replace(/\//g, '-').replace(/\\/g, '-');
}
return fileName;
}
const fileName = getFileName(title);
if (selection) {
var markdownify = selection;
} else {
var markdownify = content;
}
if (vault) {
var vaultName = '&vault=' + encodeURIComponent(`${vault}`);
} else {
var vaultName = '';
}
const markdownBody = new TurndownService({
headingStyle: 'atx',
hr: '~~~',
bulletListMarker: '-',
codeBlockStyle: 'fenced',
emDelimiter: '*',