84 lines
2.9 KiB
Plaintext
Executable File
84 lines
2.9 KiB
Plaintext
Executable File
import { timeData } from './time-data.generated';
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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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var skeletonCopy = '';
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for (var patternPos = 0; patternPos < skeleton.length; patternPos++) {
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var patternChar = skeleton.charAt(patternPos);
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if (patternChar === 'j') {
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var extraLength = 0;
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while (patternPos + 1 < skeleton.length &&
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skeleton.charAt(patternPos + 1) === patternChar) {
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extraLength++;
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patternPos++;
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}
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var hourLen = 1 + (extraLength & 1);
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var dayPeriodLen = extraLength < 2 ? 1 : 3 + (extraLength >> 1);
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var dayPeriodChar = 'a';
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var 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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}
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else if (patternChar === 'J') {
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skeletonCopy += 'H';
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}
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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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var hourCycle = locale.hourCycle;
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if (hourCycle === undefined &&
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// @ts-ignore hourCycle(s) is not identified yet
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locale.hourCycles &&
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// @ts-ignore
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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':
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return 'k';
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case 'h23':
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return 'H';
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case 'h12':
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return 'h';
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case 'h11':
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return 'K';
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default:
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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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var languageTag = locale.language;
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var regionTag;
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if (languageTag !== 'root') {
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regionTag = locale.maximize().region;
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}
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var hourCycles = timeData[regionTag || ''] ||
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timeData[languageTag || ''] ||
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timeData["".concat(languageTag, "-001")] ||
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timeData['001'];
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return hourCycles[0];
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}
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