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107 lines
4.2 KiB
TypeScript
107 lines
4.2 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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// Copyright Mathias Bynens <https://mathiasbynens.be/>
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// Adapted from https://github.com/mathiasbynens/punycode.js
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// TODO(petamoriken): enable prefer-primordials for node polyfills
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// deno-lint-ignore-file prefer-primordials
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// TODO(cmorten): migrate punycode logic to "icu" internal binding and/or "url"
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// internal module so there can be re-use within the "url" module etc.
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"use strict";
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/**
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* Creates an array containing the numeric code points of each Unicode
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* character in the string. While JavaScript uses UCS-2 internally,
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* this function will convert a pair of surrogate halves (each of which
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* UCS-2 exposes as separate characters) into a single code point,
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* matching UTF-16.
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*
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* @param str The Unicode input string (UCS-2).
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* @return The new array of code points.
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*/
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function ucs2decode(str: string) {
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const output = [];
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let counter = 0;
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const length = str.length;
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while (counter < length) {
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const value = str.charCodeAt(counter++);
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if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
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// It's a high surrogate, and there is a next character.
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const extra = str.charCodeAt(counter++);
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if ((extra & 0xFC00) == 0xDC00) { // Low surrogate.
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output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
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} else {
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// It's an unmatched surrogate; only append this code unit, in case the
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// next code unit is the high surrogate of a surrogate pair.
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output.push(value);
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counter--;
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}
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} else {
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output.push(value);
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}
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}
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return output;
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}
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/**
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* Creates a string based on an array of numeric code points.
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* @see `punycode.ucs2.decode`
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* @memberOf punycode.ucs2
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* @name encode
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* @param codePoints The array of numeric code points.
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* @returns The new Unicode string (UCS-2).
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*/
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function ucs2encode(array: number[]) {
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return String.fromCodePoint(...array);
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}
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export const ucs2 = {
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decode: ucs2decode,
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encode: ucs2encode,
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};
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