duplicate-variants.js

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// |reftest| skip-if(!this.hasOwnProperty("Intl"))

// RFC 5646 section 2.1

// variant       = 5*8alphanum         ; registered variants

//               / (DIGIT 3alphanum)

// Duplicate variants are forbidden.

assertEqArray(Intl.getCanonicalLocales("de-1996"), ["de-1996"]);

assertThrowsInstanceOf(() => Intl.getCanonicalLocales("de-1996-1996"), RangeError);

// Multiple different variants are allowed.

assertEqArray(Intl.getCanonicalLocales("sl-rozaj-solba"), ["sl-rozaj-solba"]);

// Variants can have the same prefix.

assertEqArray(Intl.getCanonicalLocales("zh-Latn-pinyin-pinyin2"), ["zh-Latn-pinyin-pinyin2"]);

// Values in extension sequences are not counted as variants.

assertEqArray(Intl.getCanonicalLocales("en-u-kf-false-kn-false"), ["en-u-kf-false-kn-false"]);

// Also test duplicates in Unicode extension keywords and attributes.

// From https://tools.ietf.org/html/rfc6067#section-2.1

//

//    An 'attribute' is a subtag with a length of three to eight

//    characters following the singleton and preceding any 'keyword'

//    sequences.  No attributes were defined at the time of this

//    document's publication.

//

//    A 'keyword' is a sequence of subtags consisting of a 'key' subtag,

//    followed by zero or more 'type' subtags (so a 'key' might appear

//    alone and not be accompanied by a 'type' subtag).  A 'key' MUST

//    NOT appear more than once in a language tag's extension string.

//

//    ...

//

//    Only the first occurrence of an attribute or key conveys meaning in a

//    language tag.  When interpreting tags containing the Unicode locale

//    extension, duplicate attributes or keywords are ignored in the

//    following way: ignore any attribute that has already appeared in the

//    tag and ignore any keyword whose key has already occurred in the tag.

//

// The duplicates itself are removed in CanonicalizeUnicodeLocaleId, step 2-3.

assertEqArray(Intl.getCanonicalLocales("en-u-kn-false-kn-false"), ["en-u-kn-false"]);

assertEqArray(Intl.getCanonicalLocales("en-u-attr1-attr2-attr2"), ["en-u-attr1-attr2"]);

if (typeof reportCompare === "function")

    reportCompare(0, 0);