src/vs/base/common/normalization.ts
63 LOC · 57 covered · 6 uncovered · 14 ranges · 4768 concepts · 4 introducers · 2418 tests
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/*---------------------------------------------------------------------------------------------
normalization.ts ×5
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { LRUCache } from './map.js';
const nfcCache = new LRUCache<string, string>(10000); // bounded to 10000 elements
export function normalizeNFC(str: string): string {
return normalize(str, 'NFC', nfcCache);
}
const nfdCache = new LRUCache<string, string>(10000); // bounded to 10000 elements
export function normalizeNFD(str: string): string {
}
const nonAsciiCharactersPattern = /[^\u0000-\u0080]/;
function normalize(str: string, form: string, normalizedCache: LRUCache<string, string>): string {
normalization.ts ×7
if (!str) {
return str;
}
const cached = normalizedCache.get(str);
if (cached) {
return cached;
}
let res: string;
if (nonAsciiCharactersPattern.test(str)) {
}
// Use the cache for fast lookup
normalizedCache.set(str, res);
return res;
}
/**
* Attempts to normalize the string to Unicode base format (NFD -> remove accents -> lower case).
* When original string contains accent characters directly, only lower casing will be performed.
* This is done so as to keep the string length the same and not affect indices.
*
* @see https://stackoverflow.com/questions/990904/remove-accents-diacritics-in-a-string-in-javascript/37511463#37511463
*/
export const tryNormalizeToBase: (str: string) => string = function () {
const cache = new LRUCache<string, string>(10000); // bounded to 10000 elements
const accentsRegex = /[\u0300-\u036f]/g;
return function (str: string): string {
if (cached) {
return cached;
}
const noAccents = normalizeNFD(str).replace(accentsRegex, '');
const result = (noAccents.length === str.length ? noAccents : str).toLowerCase();
cache.set(str, result);
return result;
};