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/**
* @license
* Copyright (C) 2015 The Android Open Source Project
*
* 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.
*/
(function(window) {
'use strict';
const util = window.util || {};
util.parseDate = function(dateStr) {
// Timestamps are given in UTC and have the format
// "'yyyy-mm-dd hh:mm:ss.fffffffff'" where "'ffffffffff'" represents
// nanoseconds.
// Munge the date into an ISO 8061 format and parse that.
return new Date(dateStr.replace(' ', 'T') + 'Z');
};
util.getCookie = function(name) {
const key = name + '=';
const cookies = document.cookie.split(';');
for (let i = 0; i < cookies.length; i++) {
let c = cookies[i];
while (c.charAt(0) === ' ') {
c = c.substring(1);
}
if (c.startsWith(key)) {
return c.substring(key.length, c.length);
}
}
return '';
};
/**
* Make the promise cancelable.
*
* Returns a promise with a `cancel()` method wrapped around `promise`.
* Calling `cancel()` will reject the returned promise with
* {isCancelled: true} synchronously. If the inner promise for a cancelled
* promise resolves or rejects this is ignored.
*/
util.makeCancelable = promise => {
// True if the promise is either resolved or reject (possibly cancelled)
let isDone = false;
let rejectPromise;
const wrappedPromise = new Promise((resolve, reject) => {
rejectPromise = reject;
promise.then(val => {
if (!isDone) resolve(val);
isDone = true;
}, error => {
if (!isDone) reject(error);
isDone = true;
});
});
wrappedPromise.cancel = () => {
if (isDone) return;
rejectPromise({isCanceled: true});
isDone = true;
};
return wrappedPromise;
};
/**
* Get computed style value.
*
* If ShadyCSS is provided, use ShadyCSS api.
* If `getComputedStyleValue` is provided on the elment, use it.
* Otherwise fallback to native method (in polymer 2).
*
*/
util.getComputedStyleValue = (name, el) => {
let style;
if (window.ShadyCSS) {
style = ShadyCSS.getComputedStyleValue(el, name);
} else if (el.getComputedStyleValue) {
style = el.getComputedStyleValue(name);
} else {
style = getComputedStyle(el).getPropertyValue(name);
}
return style;
};
/**
* Query selector on a dom element.
*
* This is shadow DOM compatible, but only works when selector is within
* one shadow host, won't work if your selector is crossing
* multiple shadow hosts.
*
*/
util.querySelector = (el, selector) => {
let nodes = [el];
let element = null;
while (nodes.length) {
const node = nodes.pop();
// Skip if it's an invalid node.
if (!node || !node.querySelector) continue;
// Try find it with native querySelector directly
element = node.querySelector(selector);
if (element) {
break;
} else if (node.shadowRoot) {
// If shadowHost detected, add the host and its children
nodes = nodes.concat(Array.from(node.children));
nodes.push(node.shadowRoot);
} else {
nodes = nodes.concat(Array.from(node.children));
}
}
return element;
};
/**
* Query selector all dom elements matching with certain selector.
*
* This is shadow DOM compatible, but only works when selector is within
* one shadow host, won't work if your selector is crossing
* multiple shadow hosts.
*
* Note: this can be very expensive, only use when have to.
*/
util.querySelectorAll = (el, selector) => {
let nodes = [el];
const results = new Set();
while (nodes.length) {
const node = nodes.pop();
if (!node || !node.querySelectorAll) continue;
// Try find all from regular children
[...node.querySelectorAll(selector)]
.forEach(el => results.add(el));
// Add all nodes with shadowRoot and loop through
const allShadowNodes = [...node.querySelectorAll('*')]
.filter(child => !!child.shadowRoot)
.map(child => child.shadowRoot);
nodes = nodes.concat(allShadowNodes);
// Add shadowRoot of current node if has one
// as its not included in node.querySelectorAll('*')
if (node.shadowRoot) {
nodes.push(node.shadowRoot);
}
}
return [...results];
};
window.util = util;
})(window);