Remove mPrevWordsInfo

This member has outlived its usefulness. It's not clear now that it
makes things really faster, but it does bring a lot of complexity
that we can avoid by removing it.

Change-Id: Ifbc8094a45b56b958fe165b1930f4cc358a97721

5 files changed, 57 insertions, 133 deletions

diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index 9da0f8451..1ba5d5ea6 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -110,7 +110,7 @@ public final class Suggest {
                 wordComposer, prevWordsInfo, proximityInfo, blockOffensiveWords,
                 additionalFeaturesOptions, SESSION_TYPING, rawSuggestions);
 
-        final boolean isFirstCharCapitalized = wordComposer.isFirstCharCapitalized();
+        final boolean isOnlyFirstCharCapitalized = wordComposer.isOnlyFirstCharCapitalized();
         // If resumed, then we don't want to upcase everything: resuming on a fully-capitalized
         // words is rarely done to switch to another fully-capitalized word, but usually to a
         // normal, non-capitalized suggestion.
@@ -122,7 +122,7 @@ public final class Suggest {
         } else {
             final SuggestedWordInfo firstSuggestedWordInfo = getTransformedSuggestedWordInfo(
                     suggestionResults.first(), suggestionResults.mLocale, isAllUpperCase,
-                    isFirstCharCapitalized, trailingSingleQuotesCount);
+                    isOnlyFirstCharCapitalized, trailingSingleQuotesCount);
             firstSuggestion = firstSuggestedWordInfo.mWord;
             if (!firstSuggestedWordInfo.isKindOf(SuggestedWordInfo.KIND_WHITELIST)) {
                 whitelistedWord = null;
@@ -142,7 +142,7 @@ public final class Suggest {
         final boolean allowsToBeAutoCorrected = (null != whitelistedWord
                 && !whitelistedWord.equals(typedWord))
                 || (consideredWord.length() > 1 && !mDictionaryFacilitator.isValidWord(
-                        consideredWord, wordComposer.isFirstCharCapitalized())
+                        consideredWord, isOnlyFirstCharCapitalized)
                         && !typedWord.equals(firstSuggestion));
 
         final boolean hasAutoCorrection;
@@ -173,12 +173,12 @@ public final class Suggest {
         final ArrayList<SuggestedWordInfo> suggestionsContainer =
                 new ArrayList<>(suggestionResults);
         final int suggestionsCount = suggestionsContainer.size();
-        if (isFirstCharCapitalized || isAllUpperCase || 0 != trailingSingleQuotesCount) {
+        if (isOnlyFirstCharCapitalized || isAllUpperCase || 0 != trailingSingleQuotesCount) {
             for (int i = 0; i < suggestionsCount; ++i) {
                 final SuggestedWordInfo wordInfo = suggestionsContainer.get(i);
                 final SuggestedWordInfo transformedWordInfo = getTransformedSuggestedWordInfo(
-                        wordInfo, suggestionResults.mLocale, isAllUpperCase, isFirstCharCapitalized,
-                        trailingSingleQuotesCount);
+                        wordInfo, suggestionResults.mLocale, isAllUpperCase,
+                        isOnlyFirstCharCapitalized, trailingSingleQuotesCount);
                 suggestionsContainer.set(i, transformedWordInfo);
             }
         }
@@ -292,11 +292,11 @@ public final class Suggest {
 
     /* package for test */ static SuggestedWordInfo getTransformedSuggestedWordInfo(
             final SuggestedWordInfo wordInfo, final Locale locale, final boolean isAllUpperCase,
-            final boolean isFirstCharCapitalized, final int trailingSingleQuotesCount) {
+            final boolean isOnlyFirstCharCapitalized, final int trailingSingleQuotesCount) {
         final StringBuilder sb = new StringBuilder(wordInfo.mWord.length());
         if (isAllUpperCase) {
             sb.append(wordInfo.mWord.toUpperCase(locale));
-        } else if (isFirstCharCapitalized) {
+        } else if (isOnlyFirstCharCapitalized) {
             sb.append(StringUtils.capitalizeFirstCodePoint(wordInfo.mWord, locale));
         } else {
             sb.append(wordInfo.mWord);
diff --git a/java/src/com/android/inputmethod/latin/WordComposer.java b/java/src/com/android/inputmethod/latin/WordComposer.java
index 7a50d1a9d..6ce1f85c5 100644
--- a/java/src/com/android/inputmethod/latin/WordComposer.java
+++ b/java/src/com/android/inputmethod/latin/WordComposer.java
@@ -45,9 +45,6 @@ public final class WordComposer {
     // The list of events that served to compose this string.
     private final ArrayList<Event> mEvents;
     private final InputPointers mInputPointers = new InputPointers(MAX_WORD_LENGTH);
-    // The information of previous words (before the composing word). Must not be null. Used as
-    // context for suggestions.
-    private PrevWordsInfo mPrevWordsInfo;
     private String mAutoCorrection;
     private boolean mIsResumed;
     private boolean mIsBatchMode;
@@ -72,9 +69,9 @@ public final class WordComposer {
     private int mCursorPositionWithinWord;
 
     /**
-     * Whether the user chose to capitalize the first char of the word.
+     * Whether the composing word has the only first char capitalized.
      */
-    private boolean mIsFirstCharCapitalized;
+    private boolean mIsOnlyFirstCharCapitalized;
 
     public WordComposer() {
         mCombinerChain = new CombinerChain("");
@@ -84,7 +81,6 @@ public final class WordComposer {
         mIsBatchMode = false;
         mCursorPositionWithinWord = 0;
         mRejectedBatchModeSuggestion = null;
-        mPrevWordsInfo = PrevWordsInfo.EMPTY_PREV_WORDS_INFO;
         refreshTypedWordCache();
     }
 
@@ -111,12 +107,11 @@ public final class WordComposer {
         mAutoCorrection = null;
         mCapsCount = 0;
         mDigitsCount = 0;
-        mIsFirstCharCapitalized = false;
+        mIsOnlyFirstCharCapitalized = false;
         mIsResumed = false;
         mIsBatchMode = false;
         mCursorPositionWithinWord = 0;
         mRejectedBatchModeSuggestion = null;
-        mPrevWordsInfo = PrevWordsInfo.EMPTY_PREV_WORDS_INFO;
         refreshTypedWordCache();
     }
 
@@ -178,12 +173,6 @@ public final class WordComposer {
         return mInputPointers;
     }
 
-    private static boolean isFirstCharCapitalized(final int index, final int codePoint,
-            final boolean previous) {
-        if (index == 0) return Character.isUpperCase(codePoint);
-        return previous && !Character.isUpperCase(codePoint);
-    }
-
     /**
      * Process an input event.
      *
@@ -203,7 +192,7 @@ public final class WordComposer {
         mCursorPositionWithinWord = mCodePointSize;
         // We may have deleted the last one.
         if (0 == mCodePointSize) {
-            mIsFirstCharCapitalized = false;
+            mIsOnlyFirstCharCapitalized = false;
         }
         if (Constants.CODE_DELETE != event.mKeyCode) {
             if (newIndex < MAX_WORD_LENGTH) {
@@ -215,8 +204,12 @@ public final class WordComposer {
                     mInputPointers.addPointerAt(newIndex, keyX, keyY, 0, 0);
                 }
             }
-            mIsFirstCharCapitalized = isFirstCharCapitalized(
-                    newIndex, primaryCode, mIsFirstCharCapitalized);
+            if (0 == newIndex) {
+                mIsOnlyFirstCharCapitalized = Character.isUpperCase(primaryCode);
+            } else {
+                mIsOnlyFirstCharCapitalized = mIsOnlyFirstCharCapitalized
+                        && !Character.isUpperCase(primaryCode);
+            }
             if (Character.isUpperCase(primaryCode)) mCapsCount++;
             if (Character.isDigit(primaryCode)) mDigitsCount++;
         }
@@ -296,10 +289,8 @@ public final class WordComposer {
      * This will register NOT_A_COORDINATE for X and Ys, and use the passed keyboard for proximity.
      * @param codePoints the code points to set as the composing word.
      * @param coordinates the x, y coordinates of the key in the CoordinateUtils format
-     * @param prevWordsInfo the information of previous words, to use as context for suggestions
      */
-    public void setComposingWord(final int[] codePoints, final int[] coordinates,
-            final PrevWordsInfo prevWordsInfo) {
+    public void setComposingWord(final int[] codePoints, final int[] coordinates) {
         reset();
         final int length = codePoints.length;
         for (int i = 0; i < length; ++i) {
@@ -308,7 +299,6 @@ public final class WordComposer {
                     CoordinateUtils.yFromArray(coordinates, i)));
         }
         mIsResumed = true;
-        mPrevWordsInfo = prevWordsInfo;
     }
 
     /**
@@ -319,16 +309,13 @@ public final class WordComposer {
         return mTypedWordCache.toString();
     }
 
-    public PrevWordsInfo getPrevWordsInfoForSuggestion() {
-        return mPrevWordsInfo;
-    }
-
     /**
-     * Whether or not the user typed a capital letter as the first letter in the word
+     * Whether or not the user typed a capital letter as the first letter in the word, and no
+     * other letter is capitalized
      * @return capitalization preference
      */
-    public boolean isFirstCharCapitalized() {
-        return mIsFirstCharCapitalized;
+    public boolean isOnlyFirstCharCapitalized() {
+        return mIsOnlyFirstCharCapitalized;
     }
 
     /**
@@ -364,7 +351,7 @@ public final class WordComposer {
     }
 
     /**
-     * Saves the caps mode and the previous word at the start of composing.
+     * Saves the caps mode at the start of composing.
      *
      * WordComposer needs to know about the caps mode for several reasons. The first is, we need
      * to know after the fact what the reason was, to register the correct form into the user
@@ -373,12 +360,9 @@ public final class WordComposer {
      * Also, batch input needs to know about the current caps mode to display correctly
      * capitalized suggestions.
      * @param mode the mode at the time of start
-     * @param prevWordsInfo the information of previous words
      */
-    public void setCapitalizedModeAndPreviousWordAtStartComposingTime(final int mode,
-            final PrevWordsInfo prevWordsInfo) {
+    public void setCapitalizedModeAtStartComposingTime(final int mode) {
         mCapitalizedMode = mode;
-        mPrevWordsInfo = prevWordsInfo;
     }
 
     /**
@@ -429,11 +413,10 @@ public final class WordComposer {
         mCapsCount = 0;
         mDigitsCount = 0;
         mIsBatchMode = false;
-        mPrevWordsInfo = new PrevWordsInfo(committedWord.toString());
         mCombinerChain.reset();
         mEvents.clear();
         mCodePointSize = 0;
-        mIsFirstCharCapitalized = false;
+        mIsOnlyFirstCharCapitalized = false;
         mCapitalizedMode = CAPS_MODE_OFF;
         refreshTypedWordCache();
         mAutoCorrection = null;
@@ -443,15 +426,7 @@ public final class WordComposer {
         return lastComposedWord;
     }
 
-    // Call this when the recorded previous word should be discarded. This is typically called
-    // when the user inputs a separator that's not whitespace (including the case of the
-    // double-space-to-period feature).
-    public void discardPreviousWordForSuggestion() {
-        mPrevWordsInfo = PrevWordsInfo.EMPTY_PREV_WORDS_INFO;
-    }
-
-    public void resumeSuggestionOnLastComposedWord(final LastComposedWord lastComposedWord,
-            final PrevWordsInfo prevWordsInfo) {
+    public void resumeSuggestionOnLastComposedWord(final LastComposedWord lastComposedWord) {
         mEvents.clear();
         Collections.copy(mEvents, lastComposedWord.mEvents);
         mInputPointers.set(lastComposedWord.mInputPointers);
@@ -462,7 +437,6 @@ public final class WordComposer {
         mCursorPositionWithinWord = mCodePointSize;
         mRejectedBatchModeSuggestion = null;
         mIsResumed = true;
-        mPrevWordsInfo = prevWordsInfo;
     }
 
     public boolean isBatchMode() {
diff --git a/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java b/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
index c90dc90ce..24cc1ef0d 100644
--- a/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
+++ b/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
@@ -544,11 +544,8 @@ public final class InputLogic {
             }
         }
         mConnection.endBatchEdit();
-        mWordComposer.setCapitalizedModeAndPreviousWordAtStartComposingTime(
-                getActualCapsMode(settingsValues, keyboardSwitcher.getKeyboardShiftMode()),
-                // Prev word is 1st word before cursor
-                getPrevWordsInfoFromNthPreviousWordForSuggestion(
-                        settingsValues.mSpacingAndPunctuations, 1 /* nthPreviousWord */));
+        mWordComposer.setCapitalizedModeAtStartComposingTime(
+                getActualCapsMode(settingsValues, keyboardSwitcher.getKeyboardShiftMode()));
     }
 
     /* The sequence number member is only used in onUpdateBatchInput. It is increased each time
@@ -584,10 +581,8 @@ public final class InputLogic {
                     mSpaceState = SpaceState.PHANTOM;
                     keyboardSwitcher.requestUpdatingShiftState(
                             getCurrentAutoCapsState(settingsValues), getCurrentRecapitalizeState());
-                    mWordComposer.setCapitalizedModeAndPreviousWordAtStartComposingTime(
-                            getActualCapsMode(settingsValues,
-                                    keyboardSwitcher.getKeyboardShiftMode()),
-                                            new PrevWordsInfo(commitParts[0]));
+                    mWordComposer.setCapitalizedModeAtStartComposingTime(getActualCapsMode(
+                            settingsValues, keyboardSwitcher.getKeyboardShiftMode()));
                     ++mAutoCommitSequenceNumber;
                 }
             }
@@ -724,15 +719,7 @@ public final class InputLogic {
             mWordComposer.processEvent(inputTransaction.mEvent);
             // If it's the first letter, make note of auto-caps state
             if (mWordComposer.isSingleLetter()) {
-                // We pass 2 to getPreviousWordForSuggestion when the previous code point is a word
-                // connector. Otherwise, we pass 1 because we were not composing a word yet, so the
-                // word we want is the 1st word before the cursor.
-                mWordComposer.setCapitalizedModeAndPreviousWordAtStartComposingTime(
-                        inputTransaction.mShiftState,
-                        getPrevWordsInfoFromNthPreviousWordForSuggestion(
-                                settingsValues.mSpacingAndPunctuations,
-                                settingsValues.mSpacingAndPunctuations.isWordConnector(
-                                        mConnection.getCodePointBeforeCursor()) ? 2 : 1));
+                mWordComposer.setCapitalizedModeAtStartComposingTime(inputTransaction.mShiftState);
             }
             mConnection.setComposingText(getTextWithUnderline(
                     mWordComposer.getTypedWord()), 1);
@@ -924,10 +911,8 @@ public final class InputLogic {
                     // No need to reset mSpaceState, it has already be done (that's why we
                     // receive it as a parameter)
                     inputTransaction.setRequiresUpdateSuggestions();
-                    mWordComposer.setCapitalizedModeAndPreviousWordAtStartComposingTime(
-                            WordComposer.CAPS_MODE_OFF,
-                            getPrevWordsInfoFromNthPreviousWordForSuggestion(
-                                    inputTransaction.mSettingsValues.mSpacingAndPunctuations, 1));
+                    mWordComposer.setCapitalizedModeAtStartComposingTime(
+                            WordComposer.CAPS_MODE_OFF);
                     return;
                 }
             } else if (SpaceState.SWAP_PUNCTUATION == inputTransaction.mSpaceState) {
@@ -1107,7 +1092,6 @@ public final class InputLogic {
             final String textToInsert = inputTransaction.mSettingsValues.mSpacingAndPunctuations
                     .mSentenceSeparatorAndSpace;
             mConnection.commitText(textToInsert, 1);
-            mWordComposer.discardPreviousWordForSuggestion();
             return true;
         }
         return false;
@@ -1267,10 +1251,7 @@ public final class InputLogic {
         final int expectedCursorPosition = mConnection.getExpectedSelectionStart();
         if (!mConnection.isCursorTouchingWord(settingsValues.mSpacingAndPunctuations)) {
             // Show predictions.
-            mWordComposer.setCapitalizedModeAndPreviousWordAtStartComposingTime(
-                    WordComposer.CAPS_MODE_OFF,
-                    getPrevWordsInfoFromNthPreviousWordForSuggestion(
-                            settingsValues.mSpacingAndPunctuations, 1));
+            mWordComposer.setCapitalizedModeAtStartComposingTime(WordComposer.CAPS_MODE_OFF);
             mLatinIME.mHandler.postUpdateSuggestionStrip();
             return;
         }
@@ -1322,7 +1303,7 @@ public final class InputLogic {
                 settingsValues.mSpacingAndPunctuations,
                 0 == numberOfCharsInWordBeforeCursor ? 1 : 2);
         mWordComposer.setComposingWord(codePoints,
-                mLatinIME.getCoordinatesForCurrentKeyboard(codePoints), prevWordsInfo);
+                mLatinIME.getCoordinatesForCurrentKeyboard(codePoints));
         mWordComposer.setCursorPositionWithinWord(
                 typedWord.codePointCount(0, numberOfCharsInWordBeforeCursor));
         mConnection.setComposingRegion(expectedCursorPosition - numberOfCharsInWordBeforeCursor,
@@ -1450,7 +1431,7 @@ public final class InputLogic {
             // with the typed word, so we need to resume suggestions right away.
             final int[] codePoints = StringUtils.toCodePointArray(stringToCommit);
             mWordComposer.setComposingWord(codePoints,
-                    mLatinIME.getCoordinatesForCurrentKeyboard(codePoints), prevWordsInfo);
+                    mLatinIME.getCoordinatesForCurrentKeyboard(codePoints));
             mConnection.setComposingText(textToCommit, 1);
         }
         // Don't restart suggestion yet. We'll restart if the user deletes the separator.
@@ -1897,21 +1878,6 @@ public final class InputLogic {
         // strings.
         mLastComposedWord = mWordComposer.commitWord(commitType,
                 chosenWordWithSuggestions, separatorString, prevWordsInfo);
-        final boolean shouldDiscardPreviousWordForSuggestion;
-        if (0 == StringUtils.codePointCount(separatorString)) {
-            // Separator is 0-length, we can keep the previous word for suggestion. Either this
-            // was a manual pick or the language has no spaces in which case we want to keep the
-            // previous word, or it was the keyboard closing or the cursor moving in which case it
-            // will be reset anyway.
-            shouldDiscardPreviousWordForSuggestion = false;
-        } else {
-            // Otherwise, we discard if the separator contains any non-whitespace.
-            shouldDiscardPreviousWordForSuggestion =
-                    !StringUtils.containsOnlyWhitespace(separatorString);
-        }
-        if (shouldDiscardPreviousWordForSuggestion) {
-            mWordComposer.discardPreviousWordForSuggestion();
-        }
     }
 
     /**
diff --git a/java/src/com/android/inputmethod/latin/spellcheck/AndroidWordLevelSpellCheckerSession.java b/java/src/com/android/inputmethod/latin/spellcheck/AndroidWordLevelSpellCheckerSession.java
index d7953e6e7..0032fcb88 100644
--- a/java/src/com/android/inputmethod/latin/spellcheck/AndroidWordLevelSpellCheckerSession.java
+++ b/java/src/com/android/inputmethod/latin/spellcheck/AndroidWordLevelSpellCheckerSession.java
@@ -323,7 +323,7 @@ public abstract class AndroidWordLevelSpellCheckerSession extends Session {
                 } else {
                     coordinates = dictInfo.mKeyboard.getCoordinates(codePoints);
                 }
-                composer.setComposingWord(codePoints, coordinates, null /* previousWord */);
+                composer.setComposingWord(codePoints, coordinates);
                 // TODO: make a spell checker option to block offensive words or not
                 final ArrayList<SuggestedWordInfo> suggestions =
                         dictInfo.mDictionary.getSuggestions(composer, prevWordsInfo,
diff --git a/tests/src/com/android/inputmethod/latin/WordComposerTests.java b/tests/src/com/android/inputmethod/latin/WordComposerTests.java
index 274555a03..c44544f3d 100644
--- a/tests/src/com/android/inputmethod/latin/WordComposerTests.java
+++ b/tests/src/com/android/inputmethod/latin/WordComposerTests.java
@@ -40,8 +40,7 @@ public class WordComposerTests extends AndroidTestCase {
         final int[] COORDINATES_WITHIN_BMP =
                 CoordinateUtils.newCoordinateArray(CODEPOINTS_WITHIN_BMP.length,
                         Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
-        final PrevWordsInfo PREV_WORDS_INFO = new PrevWordsInfo("prevword");
-        wc.setComposingWord(CODEPOINTS_WITHIN_BMP, COORDINATES_WITHIN_BMP, PREV_WORDS_INFO);
+        wc.setComposingWord(CODEPOINTS_WITHIN_BMP, COORDINATES_WITHIN_BMP);
         assertEquals(wc.size(), STR_WITHIN_BMP.codePointCount(0, STR_WITHIN_BMP.length()));
         assertFalse(wc.isCursorFrontOrMiddleOfComposingWord());
         wc.setCursorPositionWithinWord(2);
@@ -56,15 +55,12 @@ public class WordComposerTests extends AndroidTestCase {
         // Move the cursor to after the 'f'
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(1));
         assertFalse(wc.isCursorFrontOrMiddleOfComposingWord());
-        // Check the previous word is still there
-        assertEquals(PREV_WORDS_INFO, wc.getPrevWordsInfoForSuggestion());
         // Move the cursor past the end of the word
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(1));
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(15));
         // Do what LatinIME does when the cursor is moved outside of the word,
         // and check the behavior is correct.
         wc.reset();
-        assertNull(wc.getPrevWordsInfoForSuggestion().mPrevWord);
 
         // \uD861\uDED7 is 𨛗, a character outside the BMP
         final String STR_WITH_SUPPLEMENTARY_CHAR = "abcde\uD861\uDED7fgh";
@@ -73,8 +69,8 @@ public class WordComposerTests extends AndroidTestCase {
         final int[] COORDINATES_WITH_SUPPLEMENTARY_CHAR =
                 CoordinateUtils.newCoordinateArray(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR.length,
                         Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PrevWordsInfo.EMPTY_PREV_WORDS_INFO);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         assertEquals(wc.size(), CODEPOINTS_WITH_SUPPLEMENTARY_CHAR.length);
         assertFalse(wc.isCursorFrontOrMiddleOfComposingWord());
         wc.setCursorPositionWithinWord(3);
@@ -83,55 +79,43 @@ public class WordComposerTests extends AndroidTestCase {
         assertTrue(wc.isCursorFrontOrMiddleOfComposingWord());
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(1));
         assertFalse(wc.isCursorFrontOrMiddleOfComposingWord());
-        assertNull(wc.getPrevWordsInfoForSuggestion().mPrevWord);
 
-        final PrevWordsInfo PREV_WORDS_INFO_STR_WITHIN_BMP = new PrevWordsInfo(STR_WITHIN_BMP);
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PREV_WORDS_INFO_STR_WITHIN_BMP);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         wc.setCursorPositionWithinWord(3);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(7));
-        assertEquals(PREV_WORDS_INFO_STR_WITHIN_BMP, wc.getPrevWordsInfoForSuggestion());
 
-        final PrevWordsInfo PREV_WORDS_INFO_STR_WITH_SUPPLEMENTARY_CHAR =
-                new PrevWordsInfo(STR_WITH_SUPPLEMENTARY_CHAR);
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PREV_WORDS_INFO_STR_WITH_SUPPLEMENTARY_CHAR);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         wc.setCursorPositionWithinWord(3);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(7));
-        assertEquals(PREV_WORDS_INFO_STR_WITH_SUPPLEMENTARY_CHAR,
-                wc.getPrevWordsInfoForSuggestion());
 
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PREV_WORDS_INFO_STR_WITHIN_BMP);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         wc.setCursorPositionWithinWord(3);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(-3));
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(-1));
-        assertEquals(PREV_WORDS_INFO_STR_WITHIN_BMP, wc.getPrevWordsInfoForSuggestion());
 
 
-        final PrevWordsInfo PREV_WORDS_INFO_NULL = PrevWordsInfo.EMPTY_PREV_WORDS_INFO;
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PREV_WORDS_INFO_NULL);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         wc.setCursorPositionWithinWord(3);
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(-9));
-        assertNull(wc.getPrevWordsInfoForSuggestion().mPrevWord);
 
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PREV_WORDS_INFO_STR_WITH_SUPPLEMENTARY_CHAR);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(-10));
-        assertEquals(PREV_WORDS_INFO_STR_WITH_SUPPLEMENTARY_CHAR,
-                wc.getPrevWordsInfoForSuggestion());
 
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PREV_WORDS_INFO_NULL);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(-11));
 
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PREV_WORDS_INFO_NULL);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(0));
 
-        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR, COORDINATES_WITH_SUPPLEMENTARY_CHAR,
-                PREV_WORDS_INFO_NULL);
+        wc.setComposingWord(CODEPOINTS_WITH_SUPPLEMENTARY_CHAR,
+                COORDINATES_WITH_SUPPLEMENTARY_CHAR);
         wc.setCursorPositionWithinWord(2);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(0));
     }