Restore deleted AndroidUnicodeUtils.java

lib/Platform/Unicode/java/com/facebook/hermes/unicode/AndroidUnicodeUtils.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.hermes.unicode;
+
+import com.facebook.proguard.annotations.DoNotStrip;
+import java.text.Collator;
+import java.text.DateFormat;
+import java.text.Normalizer;
+import java.util.Locale;
+
+// TODO: use com.facebook.common.locale.Locales.getApplicationLocale() as the current locale,
+// rather than the device locale. This is challenging because getApplicationLocale() is only
+// available via DI.
+@DoNotStrip
+public class AndroidUnicodeUtils {
+  @DoNotStrip
+  public static int localeCompare(String left, String right) {
+    Collator collator = Collator.getInstance();
+    return collator.compare(left, right);
+  }
+
+  @DoNotStrip
+  public static String dateFormat(double unixtimeMs, boolean formatDate, boolean formatTime) {
+    DateFormat format;
+    if (formatDate && formatTime) {
+      format = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM);
+    } else if (formatDate) {
+      format = DateFormat.getDateInstance(DateFormat.MEDIUM);
+    } else if (formatTime) {
+      format = DateFormat.getTimeInstance(DateFormat.MEDIUM);
+    } else {
+      throw new RuntimeException("Bad dateFormat configuration");
+    }
+    return format.format((long) unixtimeMs).toString();
+  }
+
+  @DoNotStrip
+  public static String convertToCase(String input, int targetCase, boolean useCurrentLocale) {
+    // These values must match CaseConversion in PlatformUnicode.h
+    final int targetUppercase = 0;
+    final int targetLowercase = 1;
+    // Note Java's case conversions use the user's locale. For example "I".toLowerCase()
+    // will produce a dotless i. From Java's docs: "To obtain correct results for locale
+    // insensitive strings, use toLowerCase(Locale.ENGLISH)."
+    Locale locale = useCurrentLocale ? Locale.getDefault() : Locale.ENGLISH;
+    switch (targetCase) {
+      case targetLowercase:
+        return input.toLowerCase(locale);
+      case targetUppercase:
+        return input.toUpperCase(locale);
+      default:
+        throw new RuntimeException("Invalid target case");
+    }
+  }
+
+  @DoNotStrip
+  public static String normalize(String input, int form) {
+    // Values must match NormalizationForm in PlatformUnicode.h.
+    final int formC = 0;
+    final int formD = 1;
+    final int formKC = 2;
+    final int formKD = 3;
+
+    switch (form) {
+      case formC:
+        return Normalizer.normalize(input, Normalizer.Form.NFC);
+      case formD:
+        return Normalizer.normalize(input, Normalizer.Form.NFD);
+      case formKC:
+        return Normalizer.normalize(input, Normalizer.Form.NFKC);
+      case formKD:
+        return Normalizer.normalize(input, Normalizer.Form.NFKD);
+      default:
+        throw new RuntimeException("Invalid form");
+    }
+  }
+}