Bug 1504656 - Add patch to workaround ICU bug in RelativeDateTimeCacheData::getRelativeDateTimeUnitFormatter. r=jwalden

--HG--
extra : rebase_source : f70c72f9aa04e1adceb88ddfd8764c0de20f43a8

intl/icu-patches/bug-1504656-relativetimeformat-plural-other-fallback.diff

@@ -0,0 +1,45 @@
+Workaround for https://unicode-org.atlassian.net/browse/ICU-20253
+
+https://bugzilla.mozilla.org/show_bug.cgi?id=1504656
+
+diff --git a/intl/icu/source/i18n/reldatefmt.cpp b/intl/icu/source/i18n/reldatefmt.cpp
+--- a/intl/icu/source/i18n/reldatefmt.cpp
++++ b/intl/icu/source/i18n/reldatefmt.cpp
+@@ -157,24 +157,30 @@ const UnicodeString& RelativeDateTimeCac
+  }
+ 
+  // Use fallback cache for SimpleFormatter relativeUnits.
+  const SimpleFormatter* RelativeDateTimeCacheData::getRelativeDateTimeUnitFormatter(
+         int32_t fStyle,
+         URelativeDateTimeUnit unit,
+         int32_t pastFutureIndex,
+         int32_t pluralUnit) const {
+-    int32_t style = fStyle;
+-    do {
+-        if (relativeUnitsFormatters[style][unit][pastFutureIndex][pluralUnit] != nullptr) {
+-            return relativeUnitsFormatters[style][unit][pastFutureIndex][pluralUnit];
++    while (true) {
++        int32_t style = fStyle;
++        do {
++            if (relativeUnitsFormatters[style][unit][pastFutureIndex][pluralUnit] != nullptr) {
++                return relativeUnitsFormatters[style][unit][pastFutureIndex][pluralUnit];
++            }
++            style = fallBackCache[style];
++        } while (style != -1);
++
++        if (pluralUnit == StandardPlural::OTHER) {
++            return nullptr;  // No formatter found.
+         }
+-        style = fallBackCache[style];
+-    } while (style != -1);
+-    return nullptr;  // No formatter found.
++        pluralUnit = StandardPlural::OTHER;
++    }
+  }
+ 
+ static UBool getStringWithFallback(
+         const UResourceBundle *resource,
+         const char *key,
+         UnicodeString &result,
+         UErrorCode &status) {
+     int32_t len = 0;

intl/icu/source/i18n/reldatefmt.cpp

@@ -162,14 +162,20 @@ const UnicodeString& RelativeDateTimeCacheData::getAbsoluteUnitString(
         URelativeDateTimeUnit unit,
         int32_t pastFutureIndex,
         int32_t pluralUnit) const {
-    int32_t style = fStyle;
-    do {
-        if (relativeUnitsFormatters[style][unit][pastFutureIndex][pluralUnit] != nullptr) {
-            return relativeUnitsFormatters[style][unit][pastFutureIndex][pluralUnit];
+    while (true) {
+        int32_t style = fStyle;
+        do {
+            if (relativeUnitsFormatters[style][unit][pastFutureIndex][pluralUnit] != nullptr) {
+                return relativeUnitsFormatters[style][unit][pastFutureIndex][pluralUnit];
+            }
+            style = fallBackCache[style];
+        } while (style != -1);
+
+        if (pluralUnit == StandardPlural::OTHER) {
+            return nullptr;  // No formatter found.
         }
-        style = fallBackCache[style];
-    } while (style != -1);
-    return nullptr;  // No formatter found.
+        pluralUnit = StandardPlural::OTHER;
+    }
  }
 
 static UBool getStringWithFallback(

intl/update-icu.sh

@@ -86,6 +86,7 @@ for patch in \
  suppress-warnings.diff \
  bug-1172609-timezone-recreateDefault.diff \
  bug-1198952-workaround-make-3.82-bug.diff \
+ bug-1504656-relativetimeformat-plural-other-fallback.diff \
 ; do
   echo "Applying local patch $patch"
   patch -d ${icu_dir}/../../ -p1 --no-backup-if-mismatch < ${icu_dir}/../icu-patches/$patch

js/src/tests/non262/Intl/RelativeTimeFormat/locale-fallback-handling.js

@@ -0,0 +1,15 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// In locales that don't have a relative-date/time formatter -- and presently
+// "ak" is such a locale -- behavior is expected to fall back to the root-locale
+// formatter.  This test verifies such fallback works as long as "ak" satisfies
+// these properties; "ak" may safely be changed to a different locale if that
+// ever changes.  See bug 1504656.
+assertEq(new Intl.RelativeTimeFormat("ak").format(1, "second"),
+         "+1 s");
+
+if (typeof reportCompare === "function")
+  reportCompare(0, 0, 'ok');