commonMain.net.codinux.i18n.datetime.LocalizedDateTimeFormatsResolver.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of k-i18n

Localizing language, country, unit and currency names and formatting numbers and dates for Kotlin Multiplatform with the data from Unicode CLDR project

The newest version!

package net.codinux.i18n.datetime

import net.codinux.csv.reader.CsvReader
import net.codinux.i18n.LanguageTag

class LocalizedDateTimeFormatsResolver {

    companion object {
        const val CsvFormatsSeparator = '|'
    }

    private val csvReader = CsvReader(CsvFormatsSeparator)


    fun getDateTimeFormatsForLocale(locale: LanguageTag): LocalizedDateTimeFormats =
        getDateTimeFormatsForLocaleOrNull(locale)
            ?: throw IllegalArgumentException("Localized date time formats not found for locale '$locale' or its parents. Are you sure this locale exists?")

    fun getDateTimeFormatsForLocaleOrNull(locale: LanguageTag): LocalizedDateTimeFormats? {
        val lookup = AllLocalizedDateTimeFormats.getDateTimeFormatsForLocale(locale.tag)
        var parent: LanguageTag? = locale.parent ?: LanguageTag.Root

        while ((lookup.date == null || lookup.time == null || lookup.dateTime == null) && parent != null) {
            val parentLookup = AllLocalizedDateTimeFormats.getDateTimeFormatsForLocale(parent.tag)

            if (lookup.date == null) {
                lookup.date = parentLookup.date
            }
            if (lookup.time == null) {
                lookup.time = parentLookup.time
            }
            if (lookup.dateTime == null) {
                lookup.dateTime = parentLookup.dateTime
            }

            parent = if (parent == LanguageTag.Root) null else parent.parent ?: LanguageTag.Root
        }

        return mapFormats(lookup)
    }

    private fun mapFormats(lookup: LocalizedDateTimeFormatsLookup): LocalizedDateTimeFormats? {
        if (lookup.date == null || lookup.time == null || lookup.dateTime == null) {
            return null // should only happen for custom language tags, not for language tags defined in CLDR
        }

        return LocalizedDateTimeFormats(mapFormat(lookup.date!!), mapFormat(lookup.time!!), mapFormat(lookup.dateTime!!))
    }

    private fun mapFormat(formatsCsv: String): DateOrTimeFormats {
        val formatsRow = csvReader.read(formatsCsv).first()

        return DateOrTimeFormats(formatsRow.getString(0), formatsRow.getString(1), formatsRow.getString(2), formatsRow.getString(3))
    }

}