RESTRICT AUTOMERGE Do not linkify text with RLO/LRO characters.

Also don't show smart actions for selections in text with unsupported
characters.

Bug: 116321860
Test: runtest -x cts/tests/tests/text/src/android/text/util/cts/LinkifyTest.java
Change-Id: Ib2ee544b5783234fba8ee2f93adf0b36b039520f

core/java/android/text/util/Linkify.java

@@ -28,6 +28,7 @@ import android.text.Spanned;
 import android.text.method.LinkMovementMethod;
 import android.text.method.MovementMethod;
 import android.text.style.URLSpan;
+import android.util.Log;
 import android.util.Patterns;
 import android.webkit.WebView;
 import android.widget.TextView;
@@ -66,6 +67,9 @@ import java.util.regex.Pattern;
  */
 
 public class Linkify {
+
+    private static final String LOG_TAG = "Linkify";
+
     /**
      *  Bit field indicating that web URLs should be matched in methods that
      *  take an options mask
@@ -228,6 +232,11 @@ public class Linkify {
 
     private static boolean addLinks(@NonNull Spannable text, @LinkifyMask int mask,
             @Nullable Context context) {
+        if (text != null && containsUnsupportedCharacters(text.toString())) {
+            android.util.EventLog.writeEvent(0x534e4554, "116321860", -1, "");
+            return false;
+        }
+
         if (mask == 0) {
             return false;
         }
@@ -273,6 +282,29 @@ public class Linkify {
         return true;
     }
 
+    /**
+     * Returns true if the specified text contains at least one unsupported character for applying
+     * links. Also logs the error.
+     *
+     * @param text the text to apply links to
+     * @hide
+     */
+    public static boolean containsUnsupportedCharacters(String text) {
+        if (text.contains("\u202C")) {
+            Log.e(LOG_TAG, "Unsupported character for applying links: u202C");
+            return true;
+        }
+        if (text.contains("\u202D")) {
+            Log.e(LOG_TAG, "Unsupported character for applying links: u202D");
+            return true;
+        }
+        if (text.contains("\u202E")) {
+            Log.e(LOG_TAG, "Unsupported character for applying links: u202E");
+            return true;
+        }
+        return false;
+    }
+
     /**
      *  Scans the text of the provided TextView and turns all occurrences of
      *  the link types indicated in the mask into clickable links.  If matches
@@ -420,6 +452,10 @@ public class Linkify {
     public static final boolean addLinks(@NonNull Spannable spannable, @NonNull Pattern pattern,
             @Nullable String scheme, @Nullable MatchFilter matchFilter,
             @Nullable TransformFilter transformFilter) {
+        if (spannable != null && containsUnsupportedCharacters(spannable.toString())) {
+            android.util.EventLog.writeEvent(0x534e4554, "116321860", -1, "");
+            return false;
+        }
         return addLinks(spannable, pattern, scheme, null, matchFilter,
                 transformFilter);
     }

core/java/android/view/textclassifier/TextClassification.java

@@ -38,7 +38,7 @@ public final class TextClassification {
     /**
      * @hide
      */
-    static final TextClassification EMPTY = new TextClassification.Builder().build();
+    public static final TextClassification EMPTY = new TextClassification.Builder().build();
 
     @NonNull private final String mText;
     @Nullable private final Drawable mIcon;

core/java/android/widget/SelectionActionModeHelper.java

@@ -25,6 +25,7 @@ import android.os.LocaleList;
 import android.text.Selection;
 import android.text.Spannable;
 import android.text.TextUtils;
+import android.text.util.Linkify;
 import android.util.Log;
 import android.view.ActionMode;
 import android.view.textclassifier.TextClassification;
@@ -692,11 +693,19 @@ final class SelectionActionModeHelper {
                 mLastClassificationLocales = mLocales;
 
                 trimText();
+                final TextClassification classification;
+                if (Linkify.containsUnsupportedCharacters(mText)) {
+                    // Do not show smart actions for text containing unsupported characters.
+                    android.util.EventLog.writeEvent(0x534e4554, "116321860", -1, "");
+                    classification = TextClassification.EMPTY;
+                } else {
+                    classification = mTextClassifier.classifyText(
+                            mTrimmedText, mRelativeStart, mRelativeEnd, mLocales);
+                }
                 mLastClassificationResult = new SelectionResult(
                         mSelectionStart,
                         mSelectionEnd,
-                        mTextClassifier.classifyText(
-                                mTrimmedText, mRelativeStart, mRelativeEnd, mLocales),
+                        classification,
                         selection);
 
             }

core/tests/coretests/src/android/widget/TextViewActivityTest.java

@@ -838,6 +838,19 @@ public class TextViewActivityTest {
         assertFloatingToolbarDoesNotContainItem(android.R.id.textAssist);
     }
 
+    @Test
+    public void testNoAssistItemForTextFieldWithUnsupportedCharacters() throws Throwable {
+        useSystemDefaultTextClassifier();
+        final String text = "\u202Emoc.diordna.com";
+        final TextView textView = mActivity.findViewById(R.id.textview);
+        mActivityRule.runOnUiThread(() -> textView.setText(text));
+        mInstrumentation.waitForIdleSync();
+
+        onView(withId(R.id.textview)).perform(longPressOnTextAtIndex(text.indexOf('.')));
+        sleepForFloatingToolbarPopup();
+        assertFloatingToolbarDoesNotContainItem(android.R.id.textAssist);
+    }
+
     @Test
     public void testPastePlainText_menuAction() {
         initializeClipboardWithText(TextStyle.STYLED);