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 2022 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 2022 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 2022 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 ECMAScript 2022 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
getCanonicalLocales method is called with argument locales, the following steps are taken:
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