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utils.js
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utils.js
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///////////////////////////
// cssImport
var cssImported = [];
export function importCss(url, options={}) {
return new Promise((resolve, reject) => {
var link = _importCss(url, options);
if (link==null) resolve({available:true}); // already loaded
else {
link.onload = e=>resolve({available:false}); // todo, remove eventlisteners?
link.onerror = e=>reject();
}
});
}
//let styleWrapper = document.createElement('div');
//document.head.prepend(styleWrapper);
function _importCss(url, options={}){
// handle relative urls
if (url.indexOf('./') === 0) {
// better?
// const e = new Error();
// const lines = e.stack.split('\n');
// lines[0] === 'Error' && lines.shift();
// const calledFile = lines[1].match(/[a-z]+:[^?:]+/);
// url = new URL(calledFile[0]+'/.'+url).toString();
const e = new Error();
const calledFile = e.stack.split('\n')[2].match(/[a-z]+:[^:]+/);
const calledUrl = new URL(calledFile);
calledUrl.search = '';
const url = new URL(url, calledUrl).toString();
}
const rootNode = options.for ?? document.documentElement;
if (cssImported[url]) return; // check if imported already
cssImported[url] = true;
for (let el of rootNode.querySelectorAll('link[rel=stylesheet]')) { // check if manually added
if (el.href === url) return;
}
const link = rootNode.ownerDocument.createElement('link');
link.rel = 'stylesheet';
if (options.media) link.media = options.media;
link.href = url;
rootGetStyleWrapper(rootNode).append(link);
//styleWrapper.append(link);
return link;
}
const styleWrappers = new WeakMap();
function rootGetStyleWrapper(root) {
if (!styleWrappers.has(root)) {
let styleWrapper = document.createElement('div');
root.prepend(styleWrapper);
styleWrappers.set(root, styleWrapper);
}
return styleWrappers.get(root);
}