51 lines
1.5 KiB
TypeScript
51 lines
1.5 KiB
TypeScript
/*
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* Copyright (C) 2026 Fluxer Contributors
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*
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* This file is part of Fluxer.
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*
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* Fluxer is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Fluxer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
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*/
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const ASCII_UPPER_A = 65;
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const ASCII_UPPER_Z = 90;
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const REGION_CODE_LENGTH = 2;
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function isAsciiUpperAlpha2(value: string): boolean {
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return (
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value.length === REGION_CODE_LENGTH &&
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value.charCodeAt(0) >= ASCII_UPPER_A &&
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value.charCodeAt(0) <= ASCII_UPPER_Z &&
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value.charCodeAt(1) >= ASCII_UPPER_A &&
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value.charCodeAt(1) <= ASCII_UPPER_Z
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);
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}
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export function normalizeRegionCode(regionCode: string): string | undefined {
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const trimmedRegionCode = regionCode.trim();
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if (trimmedRegionCode.length !== REGION_CODE_LENGTH) {
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return undefined;
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}
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const upperRegionCode = trimmedRegionCode.toUpperCase();
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if (!isAsciiUpperAlpha2(upperRegionCode)) {
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return undefined;
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}
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return upperRegionCode;
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}
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export function isRegionCode(value: string): boolean {
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return normalizeRegionCode(value) !== undefined;
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}
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