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jsdom.js
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jsdom.js
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'use strict';
const isHTML = require('is-html'),
isURL = require('is-absolute-url'),
{ JSDOM, ResourceLoader, VirtualConsole } = require('jsdom'),
path = require('path'),
{ Console } = require('console'),
_ = require('lodash');
class HtmlrootResourceLoader extends ResourceLoader {
constructor(htmlroot, strictSSL, userAgent) {
super({
strictSSL,
userAgent
});
this.htmlroot = htmlroot;
}
fetch(originalUrl, { element }) {
// See whether raw attribute value is root-relative.
const src = element.getAttribute('src');
if (!src) {
return null;
}
let url = originalUrl;
if (src.indexOf('/') === 0) {
url = 'file://' + path.join(this.htmlroot, src);
}
return super.fetch(url);
}
}
function defaultOptions() {
return {
features: {
FetchExternalResources: ['script'],
ProcessExternalResources: ['script']
},
runScripts: 'dangerously',
userAgent: 'uncss',
virtualConsole: new VirtualConsole().sendTo(new Console(process.stderr))
};
}
/**
* Load a page.
* @param {String} src
* @param {Object} options
* @return {Promise<JSDOM>}
*/
function fromSource(src, options) {
const config = _.cloneDeep(options.jsdom);
// The htmlroot option allows root-relative URLs (starting with a slash)
// to be used for all resources. Without it, root-relative URLs are
// looked up relative to file://, so will not be found.
if (options.htmlroot) {
config.resources = new HtmlrootResourceLoader(options.htmlroot, options.strictSSL, options.userAgent);
}
return new Promise((resolve, reject) => {
let pagePromise;
if (isURL(src)) {
pagePromise = JSDOM.fromURL(src, config);
} else if (isHTML(src)) {
pagePromise = Promise.resolve(new JSDOM(src, config));
} else {
pagePromise = JSDOM.fromFile(src, config);
}
return pagePromise.then((page) => {
if (options.inject) {
if (typeof options.inject === 'function') {
options.inject(page.window);
} else {
require(path.join(__dirname, options.inject))(page.window);
}
}
setTimeout(() => resolve(page), options.timeout);
}).catch((e) => {
reject(e);
});
});
}
/**
* Extract stylesheets' hrefs from dom
* @param {Object} window A jsdom window
* @param {Object} options Options, as passed to UnCSS
* @return {Array}
*/
function getStylesheets(window, options) {
if (Array.isArray(options.media) === false) {
options.media = [options.media];
}
const media = _.union(['', 'all', 'screen'], options.media);
const elements = window.document.querySelectorAll('link[rel="stylesheet"]');
return Array.prototype.map
.call(elements, (link) => ({
href: link.getAttribute('href'),
media: link.getAttribute('media') || ''
}))
.filter((sheet) => media.indexOf(sheet.media) !== -1)
.map((sheet) => sheet.href);
}
/**
* Filter unused selectors.
* @param {Object} window A jsdom window
* @param {Array} sels List of selectors to be filtered
* @return {Array}
*/
function findAll(window, sels) {
const document = window.document;
// Unwrap noscript elements.
const elements = document.getElementsByTagName('noscript');
Array.prototype.forEach.call(elements, (ns) => {
const wrapper = document.createElement('div');
wrapper.innerHTML = ns.textContent;
// Insert each child of the <noscript> as its sibling
Array.prototype.forEach.call(wrapper.children, (child) => {
ns.parentNode.insertBefore(child, ns);
});
});
// Do the filtering.
return sels.filter((selector) => {
try {
return document.querySelector(selector);
} catch (e) {
return true;
}
});
}
module.exports = {
defaultOptions,
fromSource,
findAll,
getStylesheets
};