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53 lines
1.6 KiB
53 lines
1.6 KiB
2 years ago
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import { globalThisShim as globalThis } from "./globalThis.js";
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export function pick(obj, ...attr) {
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return attr.reduce((acc, k) => {
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if (obj.hasOwnProperty(k)) {
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acc[k] = obj[k];
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}
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return acc;
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}, {});
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}
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// Keep a reference to the real timeout functions so they can be used when overridden
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const NATIVE_SET_TIMEOUT = setTimeout;
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const NATIVE_CLEAR_TIMEOUT = clearTimeout;
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export function installTimerFunctions(obj, opts) {
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if (opts.useNativeTimers) {
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obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);
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obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);
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}
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else {
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obj.setTimeoutFn = setTimeout.bind(globalThis);
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obj.clearTimeoutFn = clearTimeout.bind(globalThis);
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}
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}
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// base64 encoded buffers are about 33% bigger (https://en.wikipedia.org/wiki/Base64)
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const BASE64_OVERHEAD = 1.33;
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// we could also have used `new Blob([obj]).size`, but it isn't supported in IE9
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export function byteLength(obj) {
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if (typeof obj === "string") {
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return utf8Length(obj);
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}
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// arraybuffer or blob
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return Math.ceil((obj.byteLength || obj.size) * BASE64_OVERHEAD);
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}
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function utf8Length(str) {
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let c = 0, length = 0;
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for (let i = 0, l = str.length; i < l; i++) {
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c = str.charCodeAt(i);
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if (c < 0x80) {
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length += 1;
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}
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else if (c < 0x800) {
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length += 2;
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}
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else if (c < 0xd800 || c >= 0xe000) {
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length += 3;
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}
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else {
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i++;
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length += 4;
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}
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}
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return length;
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}
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