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// Copyright 2020 Jeff Walden, Mozilla Corporation. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-isstructurallyvalidlanguagetag
description: >
Verifies that just as duplicate variants in a tag ("en-emodeng-emodeng") make
the tag structurally invalid, so too do duplicate variants in the tlang
component of an otherwise structurally valid tag ("de-t-emodeng-emodeng"),
make it structurally invalid.
info: |
if a `transformed_extensions` component that contains a `tlang` component is
present, then
the `tlang` component contains no duplicate `unicode_variant_subtag`
subtags.
features: [Intl.Locale]
---*/
assert.sameValue(typeof Intl.Locale, "function");
function mustReject(tag) {
assert.throws(RangeError, () => {
// Direct matches are rejected.
new Intl.Locale(tag);
}, `tag "${tag}" must be considered structurally invalid`);
}
// BCP47 since forever, and ECMA-402 as consequence, do not consider tags that
// contain duplicate variants to be structurally valid. This restriction also
// applies within the |tlang| component (indicating the source locale from which
// relevant content was transformed) of a broader language tag.
// Direct matches are rejected.
mustReject("de-t-en-emodeng-emodeng");
// Case-insensitive matches are also rejected.
mustReject("de-t-en-Emodeng-emodeng");
// ...and in either order.
mustReject("de-t-en-emodeng-Emodeng");
// Repeat the above tests with additional variants interspersed at each point
// for completeness.
mustReject("de-t-en-variant-emodeng-emodeng");
mustReject("de-t-en-variant-Emodeng-emodeng");
mustReject("de-t-en-variant-emodeng-Emodeng");
mustReject("de-t-en-emodeng-variant-emodeng");
mustReject("de-t-en-Emodeng-variant-emodeng");
mustReject("de-t-en-emodeng-variant-Emodeng");
mustReject("de-t-en-emodeng-emodeng-variant");
mustReject("de-t-en-Emodeng-emodeng-variant");
mustReject("de-t-en-emodeng-Emodeng-variant");
reportCompare(0, 0);
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