This proposal adds several function properties to the
Intl Object to list supported values of options. See the README for more context.
This clause describes the String values used in the ECMAScript 2021 Internationalization API Specification to identify locales, currencies, time zones,
and measurement units.
The String values used to identify locales, currencies, and time zones are interpreted in a case-insensitive manner, treating the Unicode Basic Latin characters
The ECMAScript 2021 Internationalization API Specification identifies locales using Unicode BCP 47 locale identifiers as defined by Unicode Technical Standard #35 LDML § 3 Unicode Language and Locale Identifiers, which may include extensions such as the Unicode BCP 47 U Extension. Their canonical form is specified in Unicode Technical Standard #35 LDML § 3.2.1 Canonical Unicode Locale Identifiers.
Unicode BCP 47 locale identifiers are structurally valid when they match those syntactical formatting criteria of Unicode Technical Standard 35, section 3.2, but it is not required to validate them according to the Unicode validation data. All structurally valid language tags are valid for use with the APIs defined by this standard. However, the set of locales and thus language tags that an implementation supports with adequate localizations is implementation dependent. The constructors Collator, NumberFormat, DateTimeFormat, and PluralRules map the language tags used in requests to locales supported by their respective implementations.
This standard uses the term "Unicode locale extension sequence" - as described in
unicode_locale_extensions in UTS 35 Unicode Locale Identifier, section 3.2 - for any substring of a language tag that is not part of a private use subtag sequence, starts with a separator
The IsStructurallyValidLanguageTag abstract operation verifies that the locale argument (which must be a String value)
The abstract operation returns true if locale can be generated from the EBNF grammar in section 3.2 of the Unicode Technical Standard 35, starting with
unicode_locale_id, and does not contain duplicate variant or singleton subtags (other than as a private use subtag). It returns false otherwise. Terminal value characters in the grammar are interpreted as the Unicode equivalents of the ASCII octet values given.
The CanonicalizeUnicodeLocaleId abstract operation returns the canonical and case-regularized form of the locale argument (which must be a String value that is a structurally valid Unicode BCP 47 locale identifier as verified by the
The DefaultLocale abstract operation returns a String value representing the structurally valid (
The ECMAScript 2021 Internationalization API Specification identifies currencies using 3-letter currency codes as defined by ISO 4217. Their canonical form is upper case.
All well-formed 3-letter ISO 4217 currency codes are allowed. However, the set of combinations of currency code and language tag for which localized currency symbols are available is implementation dependent. Where a localized currency symbol is not available, the ISO 4217 currency code is used for formatting.
The IsWellFormedCurrencyCode abstract operation verifies that the currency argument (which must be a String value) represents a well-formed 3-letter ISO currency code. The following steps are taken:
The ECMAScript 2021 Internationalization API Specification identifies time zones using the Zone and Link names of the IANA Time Zone Database. Their canonical form is the corresponding Zone name in the casing used in the IANA Time Zone Database.
All registered Zone and Link names are allowed. Implementations must recognize all such names, and use best available current and historical information about their offsets from UTC and their daylight saving time rules in calculations. However, the set of combinations of time zone name and language tag for which localized time zone names are available is implementation dependent.
The IsValidTimeZoneName abstract operation verifies that the timeZone argument (which must be a String value) represents a valid Zone or Link name of the IANA Time Zone Database.
The abstract operation returns true if timeZone, converted to upper case as described in
The CanonicalizeTimeZoneName abstract operation returns the canonical and case-regularized form of the timeZone argument (which must be a String value that is a valid time zone name as verified by the
The Intl.DateTimeFormat constructor allows this time zone name; if the time zone is not specified, the host environment's current time zone is used. Implementations shall support UTC and the host environment's current time zone (if different from UTC) in formatting.
The ECMAScript 2021 Internationalization API Specification identifies measurement units using a core unit identifier as defined by Unicode Technical Standard #35, Part 2, Section 6. Their canonical form is a string containing all lowercase letters with zero or more hyphens.
Only a limited set of core unit identifiers are allowed. An illegal core unit identifier results in a RangeError.
The IsWellFormedUnitIdentifier abstract operation verifies that the unitIdentifier argument (which must be a String value) represents a well-formed core unit identifier as defined in UTS #35, Part 2, Section 6. In addition to obeying the UTS #35 core unit identifier syntax, unitIdentifier must be one of the identifiers sanctioned by UTS #35 or be a compound unit composed of two sanctioned simple units. The following steps are taken:
The IsSanctionedSimpleUnitIdentifier abstract operation verifies that the given core unit identifier is among the simple units sanctioned in the current version of the ECMAScript Internationalization API Specification, a subset of the Validity Data as described in UTS #35, Part 1, Section 3.11; the list may grow over time. As discussed in UTS #35, a simple unit is one that does not have a numerator and denominator. The following steps are taken:
The Intl object is the %Intl% intrinsic object and the initial value of the
The value of the [[Prototype]] internal slot of the Intl object is the intrinsic object
The Intl object is not a function object. It does not have a [[Construct]] internal method; it is not possible to use the Intl object as a constructor with the
getCanonicalLocales method is called with argument locales, the following steps are taken:
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