Fix: StringIndexOutOfBoundsException.

Bug: 14985751
Change-Id: I9df2f737555ab02e24e0fbd231a97c1eec26bc57

2 files changed, 13 insertions, 3 deletions

diff --git a/java/src/com/android/inputmethod/latin/utils/DistracterFilter.java b/java/src/com/android/inputmethod/latin/utils/DistracterFilter.java
index 0a0379982..dc3e9bf71 100644
--- a/java/src/com/android/inputmethod/latin/utils/DistracterFilter.java
+++ b/java/src/com/android/inputmethod/latin/utils/DistracterFilter.java
@@ -86,9 +86,10 @@ public class DistracterFilter {
         coordinates = mKeyboard.getCoordinates(codePoints);
         composer.setComposingWord(codePoints, coordinates, prevWord);
 
-        final int trailingSingleQuotesCount = composer.trailingSingleQuotesCount();
-        final String consideredWord = trailingSingleQuotesCount > 0 ? testedWord.substring(0,
-                testedWord.length() - trailingSingleQuotesCount) : testedWord;
+        final int trailingSingleQuotesCount = StringUtils.getTrailingSingleQuotesCount(testedWord);
+        final String consideredWord = trailingSingleQuotesCount > 0 ?
+                testedWord.substring(0, testedWord.length() - trailingSingleQuotesCount) :
+                testedWord;
         final AsyncResultHolder<Boolean> holder = new AsyncResultHolder<Boolean>();
         final OnGetSuggestedWordsCallback callback = new OnGetSuggestedWordsCallback() {
             @Override
diff --git a/java/src/com/android/inputmethod/latin/utils/StringUtils.java b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
index 374badc19..73ac9a573 100644
--- a/java/src/com/android/inputmethod/latin/utils/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
@@ -538,6 +538,15 @@ public final class StringUtils {
                 ? casedText.codePointAt(0) : CODE_UNSPECIFIED;
     }
 
+    public static int getTrailingSingleQuotesCount(final CharSequence charSequence) {
+        final int lastIndex = charSequence.length() - 1;
+        int i = lastIndex;
+        while (i >= 0 && charSequence.charAt(i) == Constants.CODE_SINGLE_QUOTE) {
+            --i;
+        }
+        return lastIndex - i;
+    }
+
     @UsedForTesting
     public static class Stringizer<E> {
         public String stringize(final E element) {