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Move the safety net function to AutoCorrection (A44)

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Change-Id: Iec791d061f237f60992dd6048c4a37b46f4cb9aa
This commit is contained in:
Jean Chalard 2012-06-28 20:32:01 +09:00
parent accd63f35f
commit f72b8f5662
3 changed files with 38 additions and 40 deletions
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33
java/src/com/android/inputmethod/latin/AutoCorrection.java
View File

@ -26,6 +26,7 @@ import java.util.concurrent.ConcurrentHashMap;
public class AutoCorrection {
private static final boolean DBG = LatinImeLogger.sDBG;
private static final String TAG = AutoCorrection.class.getSimpleName();
private static final int MINIMUM_SAFETY_NET_CHAR_LENGTH = 4;
private AutoCorrection() {
// Purely static class: can't instantiate.
@ -113,4 +114,36 @@ public class AutoCorrection {
return false;
}
// TODO: Resolve the inconsistencies between the native auto correction algorithms and
// this safety net
public static boolean shouldBlockAutoCorrectionBySafetyNet(final String typedWord,
final CharSequence suggestion) {
// Safety net for auto correction.
// Actually if we hit this safety net, it's a bug.
// If user selected aggressive auto correction mode, there is no need to use the safety
// net.
// If the length of typed word is less than MINIMUM_SAFETY_NET_CHAR_LENGTH,
// we should not use net because relatively edit distance can be big.
final int typedWordLength = typedWord.length();
if (typedWordLength < MINIMUM_SAFETY_NET_CHAR_LENGTH) {
return false;
}
final int maxEditDistanceOfNativeDictionary =
(typedWordLength < 5 ? 2 : typedWordLength / 2) + 1;
final int distance = BinaryDictionary.editDistance(typedWord, suggestion.toString());
if (DBG) {
Log.d(TAG, "Autocorrected edit distance = " + distance
+ ", " + maxEditDistanceOfNativeDictionary);
}
if (distance > maxEditDistanceOfNativeDictionary) {
if (DBG) {
Log.e(TAG, "Safety net: before = " + typedWord + ", after = " + suggestion);
Log.e(TAG, "(Error) The edit distance of this correction exceeds limit. "
+ "Turning off auto-correction.");
}
return true;
} else {
return false;
}
}
}

38
java/src/com/android/inputmethod/latin/Suggest.java
View File

@ -18,7 +18,6 @@ package com.android.inputmethod.latin;
import android.content.Context;
import android.text.TextUtils;
import android.util.Log;
import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.keyboard.ProximityInfo;
@ -58,8 +57,6 @@ public class Suggest {
// Locale used for upper- and title-casing words
final private Locale mLocale;
private static final int MINIMUM_SAFETY_NET_CHAR_LENGTH = 4;
public Suggest(final Context context, final Locale locale) {
initAsynchronously(context, locale);
mLocale = locale;
@ -244,7 +241,7 @@ public class Suggest {
hasAutoCorrection = false;
} else if (AutoCorrection.suggestionExceedsAutoCorrectionThreshold(suggestionsSet.first(),
consideredWord, mAutoCorrectionThreshold)) {
hasAutoCorrection = !shouldBlockAutoCorrectionBySafetyNet(typedWord,
hasAutoCorrection = !AutoCorrection.shouldBlockAutoCorrectionBySafetyNet(typedWord,
suggestionsSet.first().mWord);
} else {
hasAutoCorrection = false;
@ -365,37 +362,4 @@ public class Suggest {
}
mMainDictionary = null;
}
// TODO: Resolve the inconsistencies between the native auto correction algorithms and
// this safety net
public static boolean shouldBlockAutoCorrectionBySafetyNet(final String typedWord,
final CharSequence suggestion) {
// Safety net for auto correction.
// Actually if we hit this safety net, it's a bug.
// If user selected aggressive auto correction mode, there is no need to use the safety
// net.
// If the length of typed word is less than MINIMUM_SAFETY_NET_CHAR_LENGTH,
// we should not use net because relatively edit distance can be big.
final int typedWordLength = typedWord.length();
if (typedWordLength < Suggest.MINIMUM_SAFETY_NET_CHAR_LENGTH) {
return false;
}
final int maxEditDistanceOfNativeDictionary =
(typedWordLength < 5 ? 2 : typedWordLength / 2) + 1;
final int distance = BinaryDictionary.editDistance(typedWord, suggestion.toString());
if (DBG) {
Log.d(TAG, "Autocorrected edit distance = " + distance
+ ", " + maxEditDistanceOfNativeDictionary);
}
if (distance > maxEditDistanceOfNativeDictionary) {
if (DBG) {
Log.e(TAG, "Safety net: before = " + typedWord + ", after = " + suggestion);
Log.e(TAG, "(Error) The edit distance of this correction exceeds limit. "
+ "Turning off auto-correction.");
}
return true;
} else {
return false;
}
}
}

7
java/src/com/android/inputmethod/latin/suggestions/SuggestionsView.java
View File

@ -57,11 +57,11 @@ import com.android.inputmethod.keyboard.KeyboardView;
import com.android.inputmethod.keyboard.MoreKeysPanel;
import com.android.inputmethod.keyboard.PointerTracker;
import com.android.inputmethod.keyboard.ViewLayoutUtils;
import com.android.inputmethod.latin.AutoCorrection;
import com.android.inputmethod.latin.LatinImeLogger;
import com.android.inputmethod.latin.R;
import com.android.inputmethod.latin.ResearchLogger;
import com.android.inputmethod.latin.StaticInnerHandlerWrapper;
import com.android.inputmethod.latin.Suggest;
import com.android.inputmethod.latin.SuggestedWords;
import com.android.inputmethod.latin.Utils;
import com.android.inputmethod.latin.define.ProductionFlag;
@ -336,8 +336,9 @@ public class SuggestionsView extends RelativeLayout implements OnClickListener,
if (LatinImeLogger.sDBG && suggestedWords.size() > 1) {
// If we auto-correct, then the autocorrection is in slot 0 and the typed word
// is in slot 1.
if (index == mCenterSuggestionIndex && Suggest.shouldBlockAutoCorrectionBySafetyNet(
suggestedWords.getWord(1).toString(), suggestedWords.getWord(0))) {
if (index == mCenterSuggestionIndex
&& AutoCorrection.shouldBlockAutoCorrectionBySafetyNet(
suggestedWords.getWord(1).toString(), suggestedWords.getWord(0))) {
return 0xFFFF0000;
}
}