Marc Mintel
5397309103
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69 lines
2.3 KiB
Plaintext
69 lines
2.3 KiB
Plaintext
import { timeData } from "./time-data.generated.js";
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/**
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* Returns the best matching date time pattern if a date time skeleton
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* pattern is provided with a locale. Follows the Unicode specification:
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* https://www.unicode.org/reports/tr35/tr35-dates.html#table-mapping-requested-time-skeletons-to-patterns
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* @param skeleton date time skeleton pattern that possibly includes j, J or C
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* @param locale
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*/
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export function getBestPattern(skeleton, locale) {
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let skeletonCopy = "";
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for (let patternPos = 0; patternPos < skeleton.length; patternPos++) {
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const patternChar = skeleton.charAt(patternPos);
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if (patternChar === "j") {
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let extraLength = 0;
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while (patternPos + 1 < skeleton.length && skeleton.charAt(patternPos + 1) === patternChar) {
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extraLength++;
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patternPos++;
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}
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let hourLen = 1 + (extraLength & 1);
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let dayPeriodLen = extraLength < 2 ? 1 : 3 + (extraLength >> 1);
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let dayPeriodChar = "a";
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let hourChar = getDefaultHourSymbolFromLocale(locale);
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if (hourChar == "H" || hourChar == "k") {
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dayPeriodLen = 0;
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}
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while (dayPeriodLen-- > 0) {
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skeletonCopy += dayPeriodChar;
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}
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while (hourLen-- > 0) {
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skeletonCopy = hourChar + skeletonCopy;
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}
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} else if (patternChar === "J") {
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skeletonCopy += "H";
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} else {
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skeletonCopy += patternChar;
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}
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}
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return skeletonCopy;
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}
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/**
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* Maps the [hour cycle type](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/hourCycle)
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* of the given `locale` to the corresponding time pattern.
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* @param locale
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*/
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function getDefaultHourSymbolFromLocale(locale) {
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let hourCycle = locale.hourCycle;
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if (hourCycle === undefined && locale.hourCycles && locale.hourCycles.length) {
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// @ts-ignore
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hourCycle = locale.hourCycles[0];
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}
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if (hourCycle) {
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switch (hourCycle) {
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case "h24": return "k";
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case "h23": return "H";
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case "h12": return "h";
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case "h11": return "K";
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default: throw new Error("Invalid hourCycle");
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}
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}
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// TODO: Once hourCycle is fully supported remove the following with data generation
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const languageTag = locale.language;
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let regionTag;
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if (languageTag !== "root") {
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regionTag = locale.maximize().region;
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}
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const hourCycles = timeData[regionTag || ""] || timeData[languageTag || ""] || timeData[`${languageTag}-001`] || timeData["001"];
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return hourCycles[0];
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}
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