Fix m(in|ax)imize() with long locale

Bug: v8:11350
Change-Id: Ic34b40c4d88d6c2a0ac62bbebee4e2a95ebba826
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2648973
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72417}

src/objects/js-locale.cc

@@ -392,22 +392,62 @@ MaybeHandle<JSLocale> Construct(Isolate* isolate,
 
 MaybeHandle<JSLocale> JSLocale::Maximize(Isolate* isolate,
                                          Handle<JSLocale> locale) {
-  icu::Locale icu_locale(*(locale->icu_locale().raw()));
+  // ICU has limitation on the length of the locale while addLikelySubtags
+  // is called. Work around the issue by only perform addLikelySubtags
+  // on the base locale and merge the extension if needed.
+  icu::Locale source(*(locale->icu_locale().raw()));
+  icu::Locale result = icu::Locale::createFromName(source.getBaseName());
   UErrorCode status = U_ZERO_ERROR;
-  icu_locale.addLikelySubtags(status);
+  result.addLikelySubtags(status);
+  if (strlen(source.getBaseName()) != strlen(result.getBaseName())) {
+    // Base name is changed
+    if (strlen(source.getBaseName()) != strlen(source.getName())) {
+      // the source has extensions, get the extensions from the source.
+      result = icu::LocaleBuilder()
+                   .setLocale(source)
+                   .setLanguage(result.getLanguage())
+                   .setRegion(result.getCountry())
+                   .setScript(result.getScript())
+                   .setVariant(result.getVariant())
+                   .build(status);
+    }
+  } else {
+    // Base name is not changed
+    result = source;
+  }
   DCHECK(U_SUCCESS(status));
-  DCHECK(!icu_locale.isBogus());
-  return Construct(isolate, icu_locale);
+  DCHECK(!result.isBogus());
+  return Construct(isolate, result);
 }
 
 MaybeHandle<JSLocale> JSLocale::Minimize(Isolate* isolate,
                                          Handle<JSLocale> locale) {
-  icu::Locale icu_locale(*(locale->icu_locale().raw()));
+  // ICU has limitation on the length of the locale while minimizeSubtags
+  // is called. Work around the issue by only perform addLikelySubtags
+  // on the base locale and merge the extension if needed.
+  icu::Locale source(*(locale->icu_locale().raw()));
+  icu::Locale result = icu::Locale::createFromName(source.getBaseName());
   UErrorCode status = U_ZERO_ERROR;
-  icu_locale.minimizeSubtags(status);
+  result.minimizeSubtags(status);
+  if (strlen(source.getBaseName()) != strlen(result.getBaseName())) {
+    // Base name is changed
+    if (strlen(source.getBaseName()) != strlen(source.getName())) {
+      // the source has extensions, get the extensions from the source.
+      result = icu::LocaleBuilder()
+                   .setLocale(source)
+                   .setLanguage(result.getLanguage())
+                   .setRegion(result.getCountry())
+                   .setScript(result.getScript())
+                   .setVariant(result.getVariant())
+                   .build(status);
+    }
+  } else {
+    // Base name is not changed
+    result = source;
+  }
   DCHECK(U_SUCCESS(status));
-  DCHECK(!icu_locale.isBogus());
-  return Construct(isolate, icu_locale);
+  DCHECK(!result.isBogus());
+  return Construct(isolate, result);
 }
 
 Handle<Object> JSLocale::Language(Isolate* isolate, Handle<JSLocale> locale) {

test/intl/regress-11350.js

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Test Long Locale handle minimize and maximize correctly.
+
+let ext = "-u-cu-eur-em-default-hc-h23-ks-level1-lb-strict-lw-normal-" +
+          "ms-metric-nu-latn-rg-atzzzz-sd-atat1-ss-none-tz-atvie-va-posix";
+
+// Test maximize()
+assertEquals ("de-Latn-DE" + ext,
+    (new Intl.Locale("de" + ext)).maximize().toString());
+
+assertEquals ("de-Latn-DE" + ext,
+    (new Intl.Locale("de-DE" + ext)).maximize().toString());
+
+assertEquals ("de-Latn-DE" + ext,
+    (new Intl.Locale("de-Latn" + ext)).maximize().toString());
+
+assertEquals ("de-Latn-DE" + ext,
+    (new Intl.Locale("de-Latn-DE" + ext)).maximize().toString());
+
+assertEquals ("de-Hant-DE" + ext,
+    (new Intl.Locale("de-Hant" + ext)).maximize().toString());
+
+assertEquals ("de-Hant-AT" + ext,
+    (new Intl.Locale("de-Hant-AT" + ext)).maximize().toString());
+
+assertEquals ("de-Latn-AT" + ext,
+    (new Intl.Locale("de-AT" + ext)).maximize().toString());
+
+// Test minimize()
+assertEquals ("de" + ext,
+    (new Intl.Locale("de-Latn-DE" + ext)).minimize().toString());
+
+assertEquals ("de" + ext,
+    (new Intl.Locale("de-Latn" + ext)).minimize().toString());
+
+assertEquals ("de" + ext,
+    (new Intl.Locale("de-DE" + ext)).minimize().toString());
+
+assertEquals ("de-AT" + ext,
+    (new Intl.Locale("de-Latn-AT" + ext)).minimize().toString());
+
+assertEquals ("de-Hant" + ext,
+    (new Intl.Locale("de-Hant" + ext)).minimize().toString());
+
+assertEquals ("de-Hant-AT" + ext,
+    (new Intl.Locale("de-Hant-AT" + ext)).minimize().toString());