Update frameworks/base Emoji.java to Unicode 13.

As ICU is updated, delete special cases.

Test: atest core/tests/coretests/src/android/text/EmojiTest.java
Bug: 151964652

Change-Id: I89032c22e5464d257866d926062db34c65943572
(cherry picked from commit 31d7c155b7f58525f13c5fd1f0eae450e97c1080)

4 files changed, 33 insertions, 68 deletions

diff --git a/core/java/android/text/AndroidBidi.java b/core/java/android/text/AndroidBidi.java
index f1e2181a8538..b9811638b28f 100644
--- a/core/java/android/text/AndroidBidi.java
+++ b/core/java/android/text/AndroidBidi.java
@@ -17,11 +17,7 @@
 package android.text;
 
 import android.compat.annotation.UnsupportedAppUsage;
-import android.icu.lang.UCharacter;
-import android.icu.lang.UCharacterDirection;
-import android.icu.lang.UProperty;
 import android.icu.text.Bidi;
-import android.icu.text.BidiClassifier;
 import android.text.Layout.Directions;
 
 import com.android.internal.annotations.VisibleForTesting;
@@ -34,32 +30,6 @@ import com.android.internal.annotations.VisibleForTesting;
 public class AndroidBidi {
 
     /**
-     * Overrides ICU {@link BidiClassifier} in order to correctly handle character directions for
-     * newest emoji that ICU is not aware of.
-     */
-    public static class EmojiBidiOverride extends BidiClassifier {
-        public EmojiBidiOverride() {
-            super(null /* No persisting object needed */);
-        }
-
-        // Tells ICU to use the standard Unicode value.
-        private static final int NO_OVERRIDE =
-                UCharacter.getIntPropertyMaxValue(UProperty.BIDI_CLASS) + 1;
-
-        @Override
-        public int classify(int c) {
-            if (Emoji.isNewEmoji(c)) {
-                // All new emoji characters in Unicode 10.0 are of the bidi class ON.
-                return UCharacterDirection.OTHER_NEUTRAL;
-            } else {
-                return NO_OVERRIDE;
-            }
-        }
-    }
-
-    private static final EmojiBidiOverride sEmojiBidiOverride = new EmojiBidiOverride();
-
-    /**
      * Runs the bidi algorithm on input text.
      */
     @UnsupportedAppUsage
@@ -82,7 +52,6 @@ public class AndroidBidi {
             default: paraLevel = Bidi.LTR; break;
         }
         final Bidi icuBidi = new Bidi(length /* maxLength */, 0 /* maxRunCount */);
-        icuBidi.setCustomClassifier(sEmojiBidiOverride);
         icuBidi.setPara(chs, paraLevel, null /* embeddingLevels */);
         for (int i = 0; i < length; i++) {
             chInfo[i] = icuBidi.getLevelAt(i);
@@ -220,4 +189,5 @@ public class AndroidBidi {
         }
         return new Directions(ld);
     }
-}
\ No newline at end of file
+}
+
diff --git a/core/java/android/text/BidiFormatter.java b/core/java/android/text/BidiFormatter.java
index 77f17a7d2377..422d3472cb8d 100644
--- a/core/java/android/text/BidiFormatter.java
+++ b/core/java/android/text/BidiFormatter.java
@@ -604,15 +604,10 @@ public final class BidiFormatter {
 
         /**
          * Return Character directionality. Same as {@link Character#getDirectionality(int)} except
-         * it overrides values for newest emoji that are not covered by ICU.
+         * it can override values for newest emoji that are not covered by ICU.
          */
         public static byte getDirectionality(int codePoint) {
-            if (Emoji.isNewEmoji(codePoint)) {
-                // TODO: Fix or remove once emoji-data.text 5.0 is in ICU or update to 6.0.
-                return Character.DIRECTIONALITY_OTHER_NEUTRALS;
-            } else {
-                return Character.getDirectionality(codePoint);
-            }
+            return Character.getDirectionality(codePoint);
         }
 
         // Internal instance variables.
diff --git a/core/java/android/text/Emoji.java b/core/java/android/text/Emoji.java
index 04fa1106bab2..cf0e3c26daac 100644
--- a/core/java/android/text/Emoji.java
+++ b/core/java/android/text/Emoji.java
@@ -60,40 +60,16 @@ public class Emoji {
         if (c == 0x1F91D || c == 0x1F93C) {
             return true;
         }
-        // Emoji Modifier Base characters new in Unicode emoji 11
-        // From https://www.unicode.org/Public/emoji/11.0/emoji-data.txt
-        // TODO: Remove once emoji-data.text 11 is in ICU or update to 11.
-        if ((0x1F9B5 <= c && c <= 0x1F9B6) || (0x1F9B8 <= c && c <= 0x1F9B9)) {
-            return true;
-        }
+        // If Android's copy of ICU is behind, check for new codepoints here.
+        // Consult log for implementation pattern.
         return UCharacter.hasBinaryProperty(c, UProperty.EMOJI_MODIFIER_BASE);
     }
 
     /**
-     * Returns true if the character is a new emoji still not supported in our version of ICU.
-     */
-    public static boolean isNewEmoji(int c) {
-        // Emoji characters new in Unicode emoji 12
-        // From https://www.unicode.org/Public/emoji/12.0/emoji-data.txt
-        // TODO: Remove once emoji-data.text 12 is in ICU or update to 12.
-        if (c < 0x1F6D5 || c > 0x1FA95) {
-            // Optimization for characters outside the new emoji range.
-            return false;
-        }
-        return c == 0x1F6D5 || c == 0x1F6FA || c == 0x1F93F || c == 0x1F971 || c == 0x1F97B
-                || (0x1F7E0 <= c && c <= 0x1F7EB) || (0x1F90D <= c && c <= 0x1F90F)
-                || (0x1F9A5 <= c && c <= 0x1F9AA) || (0x1F9AE <= c && c <= 0x1F9AF)
-                || (0x1F9BA <= c && c <= 0x1F9BF) || (0x1F9C3 <= c && c <= 0x1F9CA)
-                || (0x1F9CD <= c && c <= 0x1F9CF) || (0x1FA70 <= c && c <= 0x1FA73)
-                || (0x1FA78 <= c && c <= 0x1FA7A) || (0x1FA80 <= c && c <= 0x1FA82)
-                || (0x1FA90 <= c && c <= 0x1FA95);
-    }
-
-    /**
      * Returns true if the character has Emoji property.
      */
     public static boolean isEmoji(int codePoint) {
-        return isNewEmoji(codePoint) || UCharacter.hasBinaryProperty(codePoint, UProperty.EMOJI);
+        return UCharacter.hasBinaryProperty(codePoint, UProperty.EMOJI);
     }
 
     // Returns true if the character can be a base character of COMBINING ENCLOSING KEYCAP.
diff --git a/core/tests/coretests/src/android/text/EmojiTest.java b/core/tests/coretests/src/android/text/EmojiTest.java
index 7a42731992d1..0aeeb74df466 100644
--- a/core/tests/coretests/src/android/text/EmojiTest.java
+++ b/core/tests/coretests/src/android/text/EmojiTest.java
@@ -83,12 +83,27 @@ public class EmojiTest {
                         {0x1FA70, 0x1FA73},
                         {0x1FA78, 0x1FA7A},
                         {0x1FA80, 0x1FA82},
-                        {0x1FA90, 0x1FA95}
+                        {0x1FA90, 0x1FA95},
+                },
+                {       // EMOJI 13
+                        {0x1F6D6, 0x1F6D7},
+                        {0x1F6FB, 0x1F6FC},
+                        {0x1F90C, 0x1F90C},
+                        {0x1F972, 0x1F972},
+                        {0x1F977, 0x1F978},
+                        {0x1F9A3, 0x1F9A4},
+                        {0x1F9AB, 0x1F9AD},
+                        {0x1F9CB, 0x1F9CB},
+                        {0x1FA74, 0x1FA74},
+                        {0x1FA83, 0x1FA86},
+                        {0x1FA96, 0x1FAA8},
+                        {0x1FAB0, 0x1FAB6},
+                        {0x1FAC0, 0x1FAC2},
+                        {0x1FAD0, 0x1FAD6},
                 }
         };
 
         final Bidi icuBidi = new Bidi(0 /* maxLength */, 0 /* maxRunCount */);
-        icuBidi.setCustomClassifier(new AndroidBidi.EmojiBidiOverride());
 
         for (int version = 0; version < data.length; version++) {
             for (int row = 0; row < data[version].length; row++) {
@@ -125,6 +140,15 @@ public class EmojiTest {
                 {       // EMOJI 11
                         {0x1F9B5, 0x1F9B6},
                         {0x1F9B8, 0x1F9B9}
+                },
+                {       // EMOJI 12
+                        {0x1F90F, 0x1F90F},
+                        {0x1F9BB, 0x1F9BB},
+                        {0x1F9CD, 0x1F9CF},
+                },
+                {       // EMOJI 13
+                        {0x1F90C, 0x1F90C},
+                        {0x1F977, 0x1F977}
                 }
         };
         for (int version = 0; version < data.length; version++) {