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Enforce a length limit to auto-correction for some languages

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Bug: 15379262
Change-Id: I27fad12f468b5bc6ad1a0876aac72e5f5ca5760a
This commit is contained in:
Jean Chalard 2014-10-01 22:31:03 +09:00
parent bd4693cd3f
commit 8fc872762f
1 changed files with 58 additions and 2 deletions
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60
java/src/com/android/inputmethod/latin/Suggest.java
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@ -28,6 +28,7 @@ import com.android.inputmethod.latin.utils.StringUtils;
import com.android.inputmethod.latin.utils.SuggestionResults;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
/**
@ -49,6 +50,16 @@ public final class Suggest {
private static final boolean DBG = DebugFlags.DEBUG_ENABLED;
private final DictionaryFacilitator mDictionaryFacilitator;
private static final int MAXIMUM_AUTO_CORRECT_LENGTH_FOR_GERMAN = 12;
private static final HashMap<String, Integer> sLanguageToMaximumAutoCorrectionWithSpaceLength =
new HashMap<>();
static {
// TODO: should we add Finnish here?
// TODO: This should not be hardcoded here but be written in the dictionary header
sLanguageToMaximumAutoCorrectionWithSpaceLength.put(Locale.GERMAN.getLanguage(),
MAXIMUM_AUTO_CORRECT_LENGTH_FOR_GERMAN);
}
private float mAutoCorrectionThreshold;
public Suggest(final DictionaryFacilitator dictionaryFacilitator) {
@ -168,8 +179,18 @@ public final class Suggest {
// TODO: we may want to have shortcut-only entries auto-correct in the future.
hasAutoCorrection = false;
} else {
hasAutoCorrection = AutoCorrectionUtils.suggestionExceedsAutoCorrectionThreshold(
suggestionResults.first(), consideredWord, mAutoCorrectionThreshold);
final SuggestedWordInfo firstSuggestion = suggestionResults.first();
if (!AutoCorrectionUtils.suggestionExceedsAutoCorrectionThreshold(
firstSuggestion, consideredWord, mAutoCorrectionThreshold)) {
// Score is too low for autocorrect
hasAutoCorrection = false;
} else {
// We have a high score, so we need to check if this suggestion is in the correct
// form to allow auto-correcting to it in this language. For details of how this
// is determined, see #isAllowedByAutoCorrectionWithSpaceFilter.
// TODO: this should not have its own logic here but be handled by the dictionary.
hasAutoCorrection = isAllowedByAutoCorrectionWithSpaceFilter(firstSuggestion);
}
}
if (!TextUtils.isEmpty(typedWord)) {
@ -287,6 +308,41 @@ public final class Suggest {
return suggestionsList;
}
/**
* Computes whether this suggestion should be blocked or not in this language
*
* This function implements a filter that avoids auto-correcting to suggestions that contain
* spaces that are above a certain language-dependent character limit. In languages like German
* where it's possible to concatenate many words, it often happens our dictionary does not
* have the longer words. In this case, we offer a lot of unhelpful suggestions that contain
* one or several spaces. Ideally we should understand what the user wants and display useful
* suggestions by improving the dictionary and possibly having some specific logic. Until
* that's possible we should avoid displaying unhelpful suggestions. But it's hard to tell
* whether a suggestion is useful or not. So at least for the time being we block
* auto-correction when the suggestion is long and contains a space, which should avoid the
* worst damage.
* This function is implementing that filter. If the language enforces no such limit, then it
* always returns true. If the suggestion contains no space, it also returns true. Otherwise,
* it checks the length against the language-specific limit.
*
* @param info the suggestion info
* @return whether it's fine to auto-correct to this.
*/
private boolean isAllowedByAutoCorrectionWithSpaceFilter(final SuggestedWordInfo info) {
final Locale locale = info.mSourceDict.mLocale;
if (null == locale) {
return true;
}
final Integer maximumLengthForThisLanguage =
sLanguageToMaximumAutoCorrectionWithSpaceLength.get(locale.getLanguage());
if (null == maximumLengthForThisLanguage) {
// This language does not enforce a maximum length to auto-correction
return true;
}
return info.mWord.length() <= maximumLengthForThisLanguage
|| -1 == info.mWord.indexOf(Constants.CODE_SPACE);
}
/* package for test */ static SuggestedWordInfo getTransformedSuggestedWordInfo(
final SuggestedWordInfo wordInfo, final Locale locale, final boolean isAllUpperCase,
final boolean isOnlyFirstCharCapitalized, final int trailingSingleQuotesCount) {