2569718930@qq.com
41 lines
1.3 KiB
TypeScript
41 lines
1.3 KiB
TypeScript
export type LandingLocale = "zh-CN" | "en-US";
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export const LANDING_LOCALE_COOKIE = "polyweather.locale";
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export const LANDING_LOCALE_QUERY_PARAM = "locale";
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export const DEFAULT_LANDING_LOCALE: LandingLocale = "zh-CN";
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export function normalizeLandingLocale(value: string | null | undefined): LandingLocale | null {
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if (!value) return null;
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const normalized = value.trim().toLowerCase();
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if (normalized === "zh" || normalized === "zh-cn" || normalized.startsWith("zh-")) {
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return "zh-CN";
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}
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if (normalized === "en" || normalized === "en-us" || normalized.startsWith("en-")) {
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return "en-US";
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}
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return null;
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}
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export function pickLandingLocale(
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queryLocale: string | null | undefined,
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cookieLocale: string | null | undefined,
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acceptLanguage: string | null | undefined,
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): LandingLocale {
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const fromQuery = normalizeLandingLocale(queryLocale);
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if (fromQuery) return fromQuery;
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const fromCookie = normalizeLandingLocale(cookieLocale);
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if (fromCookie) return fromCookie;
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for (const part of String(acceptLanguage || "").split(",")) {
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const locale = normalizeLandingLocale(part.split(";")[0]);
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if (locale) return locale;
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}
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return DEFAULT_LANDING_LOCALE;
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}
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export function nextLandingLocale(locale: LandingLocale): LandingLocale {
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return locale === "zh-CN" ? "en-US" : "zh-CN";
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}
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