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nobody 2021-02-28 08:26:20 +01:00
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186
resources/webcomponentsjs/latest/webcomponents-loader.jsm
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@ -1,185 +1 @@
/**
* @license
* Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
* Code distributed by Google as part of the polymer project is also
* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
(function() {
'use strict';
/**
* Basic flow of the loader process
*
* There are 4 flows the loader can take when booting up
*
* - Synchronous script, no polyfills needed
* - wait for `DOMContentLoaded`
* - fire WCR event, as there could not be any callbacks passed to `waitFor`
*
* - Synchronous script, polyfills needed
* - document.write the polyfill bundle
* - wait on the `load` event of the bundle to batch Custom Element upgrades
* - wait for `DOMContentLoaded`
* - run callbacks passed to `waitFor`
* - fire WCR event
*
* - Asynchronous script, no polyfills needed
* - wait for `DOMContentLoaded`
* - run callbacks passed to `waitFor`
* - fire WCR event
*
* - Asynchronous script, polyfills needed
* - Append the polyfill bundle script
* - wait for `load` event of the bundle
* - batch Custom Element Upgrades
* - run callbacks pass to `waitFor`
* - fire WCR event
*/
var polyfillsLoaded = false;
var whenLoadedFns = [];
var allowUpgrades = false;
var flushFn;
function fireEvent() {
window.WebComponents.ready = true;
document.dispatchEvent(new CustomEvent('WebComponentsReady', { bubbles: true }));
}
function batchCustomElements() {
if (window.customElements && customElements.polyfillWrapFlushCallback) {
customElements.polyfillWrapFlushCallback(function (flushCallback) {
flushFn = flushCallback;
if (allowUpgrades) {
flushFn();
}
});
}
}
function asyncReady() {
batchCustomElements();
ready();
}
function ready() {
// bootstrap <template> elements before custom elements
if (window.HTMLTemplateElement && HTMLTemplateElement.bootstrap) {
HTMLTemplateElement.bootstrap(window.document);
}
polyfillsLoaded = true;
runWhenLoadedFns().then(fireEvent);
}
function runWhenLoadedFns() {
allowUpgrades = false;
var fnsMap = whenLoadedFns.map(function(fn) {
return fn instanceof Function ? fn() : fn;
});
whenLoadedFns = [];
return Promise.all(fnsMap).then(function() {
allowUpgrades = true;
flushFn && flushFn();
}).catch(function(err) {
console.error(err);
});
}
window.WebComponents = window.WebComponents || {};
window.WebComponents.ready = window.WebComponents.ready || false;
window.WebComponents.waitFor = window.WebComponents.waitFor || function(waitFn) {
if (!waitFn) {
return;
}
whenLoadedFns.push(waitFn);
if (polyfillsLoaded) {
runWhenLoadedFns();
}
};
window.WebComponents._batchCustomElements = batchCustomElements;
var name = 'webcomponents-loader.js';
// Feature detect which polyfill needs to be imported.
var polyfills = [];
if (!('attachShadow' in Element.prototype && 'getRootNode' in Element.prototype) ||
(window.ShadyDOM && window.ShadyDOM.force)) {
polyfills.push('sd');
}
if (!window.customElements || window.customElements.forcePolyfill) {
polyfills.push('ce');
}
var needsTemplate = (function() {
// no real <template> because no `content` property (IE and older browsers)
var t = document.createElement('template');
if (!('content' in t)) {
return true;
}
// broken doc fragment (older Edge)
if (!(t.content.cloneNode() instanceof DocumentFragment)) {
return true;
}
// broken <template> cloning (Edge up to at least version 17)
var t2 = document.createElement('template');
t2.content.appendChild(document.createElement('div'));
t.content.appendChild(t2);
var clone = t.cloneNode(true);
return (clone.content.childNodes.length === 0 ||
clone.content.firstChild.content.childNodes.length === 0);
})();
// NOTE: any browser that does not have template or ES6 features
// must load the full suite of polyfills.
if (!window.Promise || !Array.from || !window.URL || !window.Symbol || needsTemplate) {
polyfills = ['sd-ce-pf'];
}
if (polyfills.length) {
var url;
var polyfillFile = 'bundles/webcomponents-' + polyfills.join('-') + '.js';
// Load it from the right place.
if (window.WebComponents.root) {
url = window.WebComponents.root + polyfillFile;
} else {
var script = document.querySelector('script[src*="' + name +'"]');
// Load it from the right place.
url = script.src.replace(name, polyfillFile);
}
var newScript = document.createElement('script');
newScript.src = url;
// if readyState is 'loading', this script is synchronous
if (document.readyState === 'loading') {
// make sure custom elements are batched whenever parser gets to the injected script
newScript.setAttribute('onload', 'window.WebComponents._batchCustomElements()');
document.write(newScript.outerHTML);
document.addEventListener('DOMContentLoaded', ready);
} else {
newScript.addEventListener('load', function () {
asyncReady();
});
newScript.addEventListener('error', function () {
throw new Error('Could not load polyfill bundle' + url);
});
document.head.appendChild(newScript);
}
} else {
// if readyState is 'complete', script is loaded imperatively on a spec-compliant browser, so just fire WCR
if (document.readyState === 'complete') {
polyfillsLoaded = true;
fireEvent();
} else {
// this script may come between DCL and load, so listen for both, and cancel load listener if DCL fires
window.addEventListener('load', ready);
window.addEventListener('DOMContentLoaded', function() {
window.removeEventListener('load', ready);
ready();
})
}
}
})();
!function(){"use strict";var n,t=!1,o=[],d=!1;function e(){window.WebComponents.ready=!0,document.dispatchEvent(new CustomEvent("WebComponentsReady",{bubbles:!0}))}function i(){window.customElements&&customElements.polyfillWrapFlushCallback&&customElements.polyfillWrapFlushCallback(function(e){n=e,d&&n()})}function r(){window.HTMLTemplateElement&&HTMLTemplateElement.bootstrap&&HTMLTemplateElement.bootstrap(window.document),t=!0,c().then(e)}function c(){d=!1;var e=o.map(function(e){return e instanceof Function?e():e});return o=[],Promise.all(e).then(function(){d=!0,n&&n()}).catch(function(e){console.error(e)})}window.WebComponents=window.WebComponents||{},window.WebComponents.ready=window.WebComponents.ready||!1,window.WebComponents.waitFor=window.WebComponents.waitFor||function(e){e&&(o.push(e),t&&c())},window.WebComponents._batchCustomElements=i;var a="webcomponents-loader.js",l=[];"attachShadow"in Element.prototype&&"getRootNode"in Element.prototype&&(!window.ShadyDOM||!window.ShadyDOM.force)||l.push("sd"),window.customElements&&!window.customElements.forcePolyfill||l.push("ce");var s,m,w,u=function(){var e=document.createElement("template");if(!("content"in e))return!0;if(!(e.content.cloneNode()instanceof DocumentFragment))return!0;var n=document.createElement("template");n.content.appendChild(document.createElement("div")),e.content.appendChild(n);var t=e.cloneNode(!0);return 0===t.content.childNodes.length||0===t.content.firstChild.content.childNodes.length}();window.Promise&&Array.from&&window.URL&&window.Symbol&&!u||(l=["sd-ce-pf"]),l.length?(s="bundles/webcomponents-"+l.join("-")+".js",m=window.WebComponents.root?window.WebComponents.root+s:document.querySelector('script[src*="'+a+'"]').src.replace(a,s),(w=document.createElement("script")).src=m,"loading"===document.readyState?(w.setAttribute("onload","window.WebComponents._batchCustomElements()"),document.write(w.outerHTML),document.addEventListener("DOMContentLoaded",r)):(w.addEventListener("load",function(){i(),r()}),w.addEventListener("error",function(){throw new Error("Could not load polyfill bundle"+m)}),document.head.appendChild(w))):"complete"===document.readyState?(t=!0,e()):(window.addEventListener("load",r),window.addEventListener("DOMContentLoaded",function(){window.removeEventListener("load",r),r()}))}();