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Find multiple previous word information to support n-gram.

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Bug: 14425059

Change-Id: Ieace636334a9b2a094527341d4fcfc05958296c5
This commit is contained in:
Keisuke Kuroyanagi 2014-06-27 17:59:21 +09:00
parent 05b1e0d42f
commit 1c2f1ada83
4 changed files with 108 additions and 58 deletions
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43
java/src/com/android/inputmethod/latin/PrevWordsInfo.java
View File

@ -27,7 +27,8 @@ import com.android.inputmethod.latin.utils.StringUtils;
public class PrevWordsInfo {
public static final PrevWordsInfo EMPTY_PREV_WORDS_INFO =
new PrevWordsInfo(WordInfo.EMPTY_WORD_INFO);
public static final PrevWordsInfo BEGINNING_OF_SENTENCE = new PrevWordsInfo();
public static final PrevWordsInfo BEGINNING_OF_SENTENCE =
new PrevWordsInfo(WordInfo.BEGINNING_OF_SENTENCE);
/**
* Word information used to represent previous words information.
@ -57,6 +58,24 @@ public class PrevWordsInfo {
public boolean isValid() {
return mWord != null;
}
@Override
public int hashCode() {
return Arrays.hashCode(new Object[] { mWord, mIsBeginningOfSentence } );
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof WordInfo)) return false;
final WordInfo wordInfo = (WordInfo)o;
if (mWord == null || wordInfo.mWord == null) {
return mWord == wordInfo.mWord
&& mIsBeginningOfSentence == wordInfo.mIsBeginningOfSentence;
}
return mWord.equals(wordInfo.mWord)
&& mIsBeginningOfSentence == wordInfo.mIsBeginningOfSentence;
}
}
// The words immediately before the considered word. EMPTY_WORD_INFO element means we don't
@ -67,16 +86,9 @@ public class PrevWordsInfo {
// calling getSuggetions* in this situation.
public WordInfo[] mPrevWordsInfo = new WordInfo[Constants.MAX_PREV_WORD_COUNT_FOR_N_GRAM];
// Beginning of sentence.
public PrevWordsInfo() {
mPrevWordsInfo[0] = WordInfo.BEGINNING_OF_SENTENCE;
Arrays.fill(mPrevWordsInfo, 1 /* start */, mPrevWordsInfo.length, WordInfo.EMPTY_WORD_INFO);
}
// Construct from the previous word information.
public PrevWordsInfo(final WordInfo prevWordInfo) {
mPrevWordsInfo[0] = prevWordInfo;
Arrays.fill(mPrevWordsInfo, 1 /* start */, mPrevWordsInfo.length, WordInfo.EMPTY_WORD_INFO);
}
// Construct from WordInfo array. n-th element represents (n+1)-th previous word's information.
@ -115,6 +127,19 @@ public class PrevWordsInfo {
}
}
@Override
public int hashCode() {
return Arrays.hashCode(mPrevWordsInfo);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof PrevWordsInfo)) return false;
final PrevWordsInfo prevWordsInfo = (PrevWordsInfo)o;
return Arrays.equals(mPrevWordsInfo, prevWordsInfo.mPrevWordsInfo);
}
@Override
public String toString() {
final StringBuffer builder = new StringBuffer();
@ -123,7 +148,7 @@ public class PrevWordsInfo {
builder.append("PrevWord[");
builder.append(i);
builder.append("]: ");
if (!wordInfo.isValid()) {
if (wordInfo == null || !wordInfo.isValid()) {
builder.append("Empty. ");
continue;
}

105
java/src/com/android/inputmethod/latin/RichInputConnection.java
View File

@ -26,6 +26,7 @@ import android.view.inputmethod.ExtractedText;
import android.view.inputmethod.ExtractedTextRequest;
import android.view.inputmethod.InputConnection;
import com.android.inputmethod.latin.PrevWordsInfo.WordInfo;
import com.android.inputmethod.latin.settings.SpacingAndPunctuations;
import com.android.inputmethod.latin.utils.CapsModeUtils;
import com.android.inputmethod.latin.utils.DebugLogUtils;
@ -49,8 +50,10 @@ public final class RichInputConnection {
private static final boolean DBG = false;
private static final boolean DEBUG_PREVIOUS_TEXT = false;
private static final boolean DEBUG_BATCH_NESTING = false;
// Provision for a long word pair and a separator
private static final int LOOKBACK_CHARACTER_NUM = Constants.DICTIONARY_MAX_WORD_LENGTH * 2 + 1;
// Provision for long words and separators between the words.
private static final int LOOKBACK_CHARACTER_NUM = Constants.DICTIONARY_MAX_WORD_LENGTH
* (Constants.MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1) /* words */
+ Constants.MAX_PREV_WORD_COUNT_FOR_N_GRAM /* separators */;
private static final Pattern spaceRegex = Pattern.compile("\\s+");
private static final int INVALID_CURSOR_POSITION = -1;
@ -544,22 +547,25 @@ public final class RichInputConnection {
return Arrays.binarySearch(sortedSeparators, code) >= 0;
}
// Get information of the nth word before cursor. n = 1 retrieves the word immediately before
// the cursor, n = 2 retrieves the word before that, and so on. This splits on whitespace only.
// Get context information from nth word before the cursor. n = 1 retrieves the words
// immediately before the cursor, n = 2 retrieves the words before that, and so on. This splits
// on whitespace only.
// Also, it won't return words that end in a separator (if the nth word before the cursor
// ends in a separator, it returns information representing beginning-of-sentence).
// Example :
// (n = 1) "abc def|" -> def
// (n = 1) "abc def |" -> def
// (n = 1) "abc 'def|" -> 'def
// Example (when Constants.MAX_PREV_WORD_COUNT_FOR_N_GRAM is 2):
// (n = 1) "abc def|" -> abc, def
// (n = 1) "abc def |" -> abc, def
// (n = 1) "abc 'def|" -> empty, 'def
// (n = 1) "abc def. |" -> beginning-of-sentence
// (n = 1) "abc def . |" -> beginning-of-sentence
// (n = 2) "abc def|" -> abc
// (n = 2) "abc def |" -> abc
// (n = 2) "abc def|" -> beginning-of-sentence, abc
// (n = 2) "abc def |" -> beginning-of-sentence, abc
// (n = 2) "abc 'def|" -> empty. The context is different from "abc def", but we cannot
// represent this situation using PrevWordsInfo. See TODO in the method.
// (n = 2) "abc def. |" -> abc
// (n = 2) "abc def . |" -> def
// TODO: The next example's result should be "abc, def". This have to be fixed before we
// retrieve the prior context of Beginning-of-Sentence.
// (n = 2) "abc def. |" -> beginning-of-sentence, abc
// (n = 2) "abc def . |" -> abc, def
// (n = 2) "abc|" -> beginning-of-sentence
// (n = 2) "abc |" -> beginning-of-sentence
// (n = 2) "abc. def|" -> beginning-of-sentence
@ -567,43 +573,50 @@ public final class RichInputConnection {
final SpacingAndPunctuations spacingAndPunctuations, final int n) {
if (prev == null) return PrevWordsInfo.EMPTY_PREV_WORDS_INFO;
final String[] w = spaceRegex.split(prev);
// Referring to the word after the nth word.
if ((n - 1) > 0 && (n - 1) <= w.length) {
final String wordFollowingTheNthPrevWord = w[w.length - n + 1];
if (!wordFollowingTheNthPrevWord.isEmpty()) {
final char firstChar = wordFollowingTheNthPrevWord.charAt(0);
if (spacingAndPunctuations.isWordConnector(firstChar)) {
// The word following the n-th prev word is starting with a word connector.
// TODO: Return meaningful context for this case.
return PrevWordsInfo.EMPTY_PREV_WORDS_INFO;
final WordInfo[] prevWordsInfo = new WordInfo[Constants.MAX_PREV_WORD_COUNT_FOR_N_GRAM];
for (int i = 0; i < prevWordsInfo.length; i++) {
final int focusedWordIndex = w.length - n - i;
// Referring to the word after the focused word.
if ((focusedWordIndex + 1) >= 0 && (focusedWordIndex + 1) < w.length) {
final String wordFollowingTheNthPrevWord = w[focusedWordIndex + 1];
if (!wordFollowingTheNthPrevWord.isEmpty()) {
final char firstChar = wordFollowingTheNthPrevWord.charAt(0);
if (spacingAndPunctuations.isWordConnector(firstChar)) {
// The word following the focused word is starting with a word connector.
// TODO: Return meaningful context for this case.
prevWordsInfo[i] = WordInfo.EMPTY_WORD_INFO;
break;
}
}
}
// If we can't find (n + i) words, the context is beginning-of-sentence.
if (focusedWordIndex < 0) {
prevWordsInfo[i] = WordInfo.BEGINNING_OF_SENTENCE;
break;
}
final String focusedWord = w[focusedWordIndex];
// If the word is empty, the context is beginning-of-sentence.
final int length = focusedWord.length();
if (length <= 0) {
prevWordsInfo[i] = WordInfo.BEGINNING_OF_SENTENCE;
break;
}
// If ends in a sentence separator, the context is beginning-of-sentence.
final char lastChar = focusedWord.charAt(length - 1);
if (spacingAndPunctuations.isSentenceSeparator(lastChar)) {
prevWordsInfo[i] = WordInfo.BEGINNING_OF_SENTENCE;
break;
}
// If ends in a word separator or connector, the context is unclear.
// TODO: Return meaningful context for this case.
if (spacingAndPunctuations.isWordSeparator(lastChar)
|| spacingAndPunctuations.isWordConnector(lastChar)) {
prevWordsInfo[i] = WordInfo.EMPTY_WORD_INFO;
break;
}
prevWordsInfo[i] = new WordInfo(focusedWord);
}
// If we can't find n words, or we found an empty word, the context is
// beginning-of-sentence.
if (w.length < n) {
return PrevWordsInfo.BEGINNING_OF_SENTENCE;
}
final String nthPrevWord = w[w.length - n];
final int length = nthPrevWord.length();
if (length <= 0) {
return PrevWordsInfo.BEGINNING_OF_SENTENCE;
}
// If ends in a sentence separator, the context is beginning-of-sentence.
final char lastChar = nthPrevWord.charAt(length - 1);
if (spacingAndPunctuations.isSentenceSeparator(lastChar)) {
return PrevWordsInfo.BEGINNING_OF_SENTENCE;
}
// If ends in a word separator or connector, the context is unclear.
// TODO: Return meaningful context for this case.
if (spacingAndPunctuations.isWordSeparator(lastChar)
|| spacingAndPunctuations.isWordConnector(lastChar)) {
return PrevWordsInfo.EMPTY_PREV_WORDS_INFO;
}
return new PrevWordsInfo(new PrevWordsInfo.WordInfo(nthPrevWord));
return new PrevWordsInfo(prevWordsInfo);
}
/**

7
java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
View File

@ -1882,10 +1882,11 @@ public final class InputLogic {
final CharSequence chosenWordWithSuggestions =
SuggestionSpanUtils.getTextWithSuggestionSpan(mLatinIME, chosenWord,
suggestedWords);
// Use the 2nd previous word as the previous word because the 1st previous word is the word
// to be committed.
// When we are composing word, get previous words information from the 2nd previous word
// because the 1st previous word is the word to be committed. Otherwise get previous words
// information from the 1st previous word.
final PrevWordsInfo prevWordsInfo = mConnection.getPrevWordsInfoFromNthPreviousWord(
settingsValues.mSpacingAndPunctuations, 2);
settingsValues.mSpacingAndPunctuations, mWordComposer.isComposingWord() ? 2 : 1);
mConnection.commitText(chosenWordWithSuggestions, 1);
// Add the word to the user history dictionary
performAdditionToUserHistoryDictionary(settingsValues, chosenWord, prevWordsInfo);

11
tests/src/com/android/inputmethod/latin/RichInputConnectionAndTextRangeTests.java
View File

@ -30,6 +30,7 @@ import android.view.inputmethod.ExtractedTextRequest;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputConnectionWrapper;
import com.android.inputmethod.latin.PrevWordsInfo.WordInfo;
import com.android.inputmethod.latin.settings.SpacingAndPunctuations;
import com.android.inputmethod.latin.utils.RunInLocale;
import com.android.inputmethod.latin.utils.StringUtils;
@ -166,6 +167,16 @@ public class RichInputConnectionAndTextRangeTests extends AndroidTestCase {
"abc def", mSpacingAndPunctuations, 2).mPrevWordsInfo[0].mIsBeginningOfSentence);
assertTrue(RichInputConnection.getPrevWordsInfoFromNthPreviousWord(
"abc", mSpacingAndPunctuations, 2).mPrevWordsInfo[0].mIsBeginningOfSentence);
// For n-gram
assertEquals(RichInputConnection.getPrevWordsInfoFromNthPreviousWord(
"abc def", mSpacingAndPunctuations, 1).mPrevWordsInfo[0].mWord, "def");
assertEquals(RichInputConnection.getPrevWordsInfoFromNthPreviousWord(
"abc def", mSpacingAndPunctuations, 1).mPrevWordsInfo[1].mWord, "abc");
assertEquals(RichInputConnection.getPrevWordsInfoFromNthPreviousWord(
"abc def", mSpacingAndPunctuations, 2).mPrevWordsInfo[1],
WordInfo.BEGINNING_OF_SENTENCE);
// The following tests reflect the current behavior of the function
// RichInputConnection#getNthPreviousWord.
// TODO: However at this time, the code does never go