Paul Frazee
72 lines
2.0 KiB
TypeScript
72 lines
2.0 KiB
TypeScript
import 'fast-text-encoding'
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import Graphemer from 'graphemer'
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// @ts-ignore no decl -prf
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import findLast from 'array.prototype.findlast'
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export {}
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findLast.shim()
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/**
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https://github.com/MaxArt2501/base64-js
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The MIT License (MIT)
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Copyright (c) 2014 MaxArt2501
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*/
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const b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
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// Regular expression to check formal correctness of base64 encoded strings
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const b64re =
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/^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/
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globalThis.atob = (str: string): string => {
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// atob can work with strings with whitespaces, even inside the encoded part,
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// but only \t, \n, \f, \r and ' ', which can be stripped.
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str = String(str).replace(/[\t\n\f\r ]+/g, '')
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if (!b64re.test(str)) {
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throw new TypeError(
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"Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.",
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)
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}
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// Adding the padding if missing, for simplicity
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str += '=='.slice(2 - (str.length & 3))
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var bitmap,
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result = '',
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r1,
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r2,
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i = 0
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for (; i < str.length; ) {
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bitmap =
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(b64.indexOf(str.charAt(i++)) << 18) |
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(b64.indexOf(str.charAt(i++)) << 12) |
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((r1 = b64.indexOf(str.charAt(i++))) << 6) |
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(r2 = b64.indexOf(str.charAt(i++)))
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result +=
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r1 === 64
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? String.fromCharCode((bitmap >> 16) & 255)
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: r2 === 64
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? String.fromCharCode((bitmap >> 16) & 255, (bitmap >> 8) & 255)
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: String.fromCharCode(
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(bitmap >> 16) & 255,
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(bitmap >> 8) & 255,
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bitmap & 255,
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)
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}
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return result
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}
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const splitter = new Graphemer()
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globalThis.Intl = globalThis.Intl || {}
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// @ts-ignore we're polyfilling -prf
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globalThis.Intl.Segmenter =
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// @ts-ignore we're polyfilling -prf
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globalThis.Intl.Segmenter ||
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class Segmenter {
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constructor() {}
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// NOTE
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// this is not a precisely correct polyfill but it's sufficient for our needs
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// -prf
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segment = splitter.iterateGraphemes
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}
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