37 lines
1.1 KiB
TypeScript
37 lines
1.1 KiB
TypeScript
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/**
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* pickLang — read the locale-preferred field with EN fallback.
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*
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* The bureau stores every narrative as a pair: `field` (EN) and
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* `field_pt_br` (Brazilian Portuguese). UI components call this helper to
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* surface the correct one based on the request locale.
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*
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* - locale "pt-br" or "pt" → prefer PT-BR, fall back to EN
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* - locale "en" → prefer EN, fall back to PT-BR
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*
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* Empty / whitespace-only strings are treated as missing so a partial row
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* still surfaces the language that has content.
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*/
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export type Locale = "pt-br" | "pt" | "en" | string | null | undefined;
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function isPt(locale: Locale): boolean {
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return locale === "pt-br" || locale === "pt";
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}
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function nonEmpty(s: string | null | undefined): string | null {
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if (typeof s !== "string") return null;
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const t = s.trim();
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return t.length > 0 ? s : null;
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}
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export function pickLang(
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en: string | null | undefined,
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pt_br: string | null | undefined,
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locale: Locale,
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): string | null {
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const enValid = nonEmpty(en);
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const ptValid = nonEmpty(pt_br);
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if (isPt(locale)) return ptValid ?? enValid;
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return enValid ?? ptValid;
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}
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