Separate SpellCheckerSession from SpellCheckerService
Bug: 6789576 Change-Id: I7c55d36afad7ef6046353b3c9e849a54a6dc83ae
This commit is contained in:
Satoshi Kataoka
parent
7389c601e3
commit
84ed096641
2 changed files with 436 additions and 393 deletions
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@ -20,14 +20,9 @@ import android.content.Intent;
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import android.content.SharedPreferences;
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import android.preference.PreferenceManager;
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import android.service.textservice.SpellCheckerService;
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import android.text.TextUtils;
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import android.util.Log;
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import android.util.LruCache;
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import android.view.textservice.SentenceSuggestionsInfo;
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import android.view.textservice.SuggestionsInfo;
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import android.view.textservice.TextInfo;
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import com.android.inputmethod.compat.SuggestionsInfoCompatUtils;
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import com.android.inputmethod.keyboard.ProximityInfo;
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import com.android.inputmethod.latin.BinaryDictionary;
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import com.android.inputmethod.latin.ContactsBinaryDictionary;
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@ -37,12 +32,10 @@ import com.android.inputmethod.latin.DictionaryFactory;
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import com.android.inputmethod.latin.LocaleUtils;
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import com.android.inputmethod.latin.R;
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import com.android.inputmethod.latin.StringUtils;
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import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
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import com.android.inputmethod.latin.SynchronouslyLoadedContactsBinaryDictionary;
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import com.android.inputmethod.latin.SynchronouslyLoadedUserBinaryDictionary;
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import com.android.inputmethod.latin.UserBinaryDictionary;
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import com.android.inputmethod.latin.WhitelistDictionary;
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import com.android.inputmethod.latin.WordComposer;
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import java.lang.ref.WeakReference;
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import java.util.ArrayList;
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@ -65,9 +58,9 @@ public class AndroidSpellCheckerService extends SpellCheckerService
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public static final String PREF_USE_CONTACTS_KEY = "pref_spellcheck_use_contacts";
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private static final int CAPITALIZE_NONE = 0; // No caps, or mixed case
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private static final int CAPITALIZE_FIRST = 1; // First only
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private static final int CAPITALIZE_ALL = 2; // All caps
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public static final int CAPITALIZE_NONE = 0; // No caps, or mixed case
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public static final int CAPITALIZE_FIRST = 1; // First only
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public static final int CAPITALIZE_ALL = 2; // All caps
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private final static String[] EMPTY_STRING_ARRAY = new String[0];
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private Map<String, DictionaryPool> mDictionaryPools =
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@ -91,8 +84,8 @@ public class AndroidSpellCheckerService extends SpellCheckerService
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public static final int SCRIPT_LATIN = 0;
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public static final int SCRIPT_CYRILLIC = 1;
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private static final String SINGLE_QUOTE = "\u0027";
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private static final String APOSTROPHE = "\u2019";
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public static final String SINGLE_QUOTE = "\u0027";
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public static final String APOSTROPHE = "\u2019";
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private static final TreeMap<String, Integer> mLanguageToScript;
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static {
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// List of the supported languages and their associated script. We won't check
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@ -129,7 +122,7 @@ public class AndroidSpellCheckerService extends SpellCheckerService
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onSharedPreferenceChanged(prefs, PREF_USE_CONTACTS_KEY);
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}
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private static int getScriptFromLocale(final Locale locale) {
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public static int getScriptFromLocale(final Locale locale) {
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final Integer script = mLanguageToScript.get(locale.getLanguage());
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if (null == script) {
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throw new RuntimeException("We have been called with an unsupported language: \""
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@ -194,17 +187,22 @@ public class AndroidSpellCheckerService extends SpellCheckerService
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return new AndroidSpellCheckerSession(this);
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}
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private static SuggestionsInfo getNotInDictEmptySuggestions() {
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public static SuggestionsInfo getNotInDictEmptySuggestions() {
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return new SuggestionsInfo(0, EMPTY_STRING_ARRAY);
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}
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private static SuggestionsInfo getInDictEmptySuggestions() {
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public static SuggestionsInfo getInDictEmptySuggestions() {
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return new SuggestionsInfo(SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY,
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EMPTY_STRING_ARRAY);
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}
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public SuggestionsGatherer newSuggestionsGatherer(final String text, int maxLength) {
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return new SuggestionsGatherer(
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text, mSuggestionThreshold, mRecommendedThreshold, maxLength);
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}
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// TODO: remove this class and replace it by storage local to the session.
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private static class SuggestionsGatherer {
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public static class SuggestionsGatherer {
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public static class Result {
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public final String[] mSuggestions;
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public final boolean mHasRecommendedSuggestions;
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@ -396,7 +394,7 @@ public class AndroidSpellCheckerService extends SpellCheckerService
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}.start();
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}
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private DictionaryPool getDictionaryPool(final String locale) {
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public DictionaryPool getDictionaryPool(final String locale) {
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DictionaryPool pool = mDictionaryPools.get(locale);
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if (null == pool) {
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final Locale localeObject = LocaleUtils.constructLocaleFromString(locale);
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@ -447,7 +445,7 @@ public class AndroidSpellCheckerService extends SpellCheckerService
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}
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// This method assumes the text is not empty or null.
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private static int getCapitalizationType(String text) {
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public static int getCapitalizationType(String text) {
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// If the first char is not uppercase, then the word is either all lower case,
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// and in either case we return CAPITALIZE_NONE.
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if (!Character.isUpperCase(text.codePointAt(0))) return CAPITALIZE_NONE;
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@ -464,379 +462,4 @@ public class AndroidSpellCheckerService extends SpellCheckerService
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if (1 == capsCount) return CAPITALIZE_FIRST;
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return (len == capsCount ? CAPITALIZE_ALL : CAPITALIZE_NONE);
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}
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private static class AndroidSpellCheckerSession extends Session {
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// Immutable, but need the locale which is not available in the constructor yet
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private DictionaryPool mDictionaryPool;
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// Likewise
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private Locale mLocale;
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// Cache this for performance
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private int mScript; // One of SCRIPT_LATIN or SCRIPT_CYRILLIC for now.
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private final AndroidSpellCheckerService mService;
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private final SuggestionsCache mSuggestionsCache = new SuggestionsCache();
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private static class SuggestionsParams {
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public final String[] mSuggestions;
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public final int mFlags;
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public SuggestionsParams(String[] suggestions, int flags) {
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mSuggestions = suggestions;
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mFlags = flags;
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}
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}
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private static class SuggestionsCache {
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private static final char CHAR_DELIMITER = '\uFFFC';
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private static final int MAX_CACHE_SIZE = 50;
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private final LruCache<String, SuggestionsParams> mUnigramSuggestionsInfoCache =
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new LruCache<String, SuggestionsParams>(MAX_CACHE_SIZE);
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// TODO: Support n-gram input
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private static String generateKey(String query, String prevWord) {
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if (TextUtils.isEmpty(query) || TextUtils.isEmpty(prevWord)) {
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return query;
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}
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return query + CHAR_DELIMITER + prevWord;
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}
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// TODO: Support n-gram input
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public SuggestionsParams getSuggestionsFromCache(String query, String prevWord) {
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return mUnigramSuggestionsInfoCache.get(generateKey(query, prevWord));
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}
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// TODO: Support n-gram input
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public void putSuggestionsToCache(
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String query, String prevWord, String[] suggestions, int flags) {
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if (suggestions == null || TextUtils.isEmpty(query)) {
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return;
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}
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mUnigramSuggestionsInfoCache.put(
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generateKey(query, prevWord), new SuggestionsParams(suggestions, flags));
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}
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}
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AndroidSpellCheckerSession(final AndroidSpellCheckerService service) {
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mService = service;
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}
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@Override
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public void onCreate() {
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final String localeString = getLocale();
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mDictionaryPool = mService.getDictionaryPool(localeString);
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mLocale = LocaleUtils.constructLocaleFromString(localeString);
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mScript = getScriptFromLocale(mLocale);
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}
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/*
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* Returns whether the code point is a letter that makes sense for the specified
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* locale for this spell checker.
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* The dictionaries supported by Latin IME are described in res/xml/spellchecker.xml
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* and is limited to EFIGS languages and Russian.
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* Hence at the moment this explicitly tests for Cyrillic characters or Latin characters
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* as appropriate, and explicitly excludes CJK, Arabic and Hebrew characters.
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*/
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private static boolean isLetterCheckableByLanguage(final int codePoint,
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final int script) {
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switch (script) {
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case SCRIPT_LATIN:
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// Our supported latin script dictionaries (EFIGS) at the moment only include
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// characters in the C0, C1, Latin Extended A and B, IPA extensions unicode
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// blocks. As it happens, those are back-to-back in the code range 0x40 to 0x2AF,
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// so the below is a very efficient way to test for it. As for the 0-0x3F, it's
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// excluded from isLetter anyway.
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return codePoint <= 0x2AF && Character.isLetter(codePoint);
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case SCRIPT_CYRILLIC:
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// All Cyrillic characters are in the 400~52F block. There are some in the upper
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// Unicode range, but they are archaic characters that are not used in modern
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// russian and are not used by our dictionary.
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return codePoint >= 0x400 && codePoint <= 0x52F && Character.isLetter(codePoint);
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default:
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// Should never come here
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throw new RuntimeException("Impossible value of script: " + script);
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}
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}
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/**
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* Finds out whether a particular string should be filtered out of spell checking.
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*
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* This will loosely match URLs, numbers, symbols. To avoid always underlining words that
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* we know we will never recognize, this accepts a script identifier that should be one
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* of the SCRIPT_* constants defined above, to rule out quickly characters from very
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* different languages.
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*
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* @param text the string to evaluate.
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* @param script the identifier for the script this spell checker recognizes
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* @return true if we should filter this text out, false otherwise
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*/
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private static boolean shouldFilterOut(final String text, final int script) {
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if (TextUtils.isEmpty(text) || text.length() <= 1) return true;
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// TODO: check if an equivalent processing can't be done more quickly with a
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// compiled regexp.
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// Filter by first letter
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final int firstCodePoint = text.codePointAt(0);
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// Filter out words that don't start with a letter or an apostrophe
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if (!isLetterCheckableByLanguage(firstCodePoint, script)
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&& '\'' != firstCodePoint) return true;
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// Filter contents
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final int length = text.length();
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int letterCount = 0;
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for (int i = 0; i < length; i = text.offsetByCodePoints(i, 1)) {
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final int codePoint = text.codePointAt(i);
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// Any word containing a '@' is probably an e-mail address
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// Any word containing a '/' is probably either an ad-hoc combination of two
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// words or a URI - in either case we don't want to spell check that
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if ('@' == codePoint || '/' == codePoint) return true;
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if (isLetterCheckableByLanguage(codePoint, script)) ++letterCount;
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}
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// Guestimate heuristic: perform spell checking if at least 3/4 of the characters
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// in this word are letters
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return (letterCount * 4 < length * 3);
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}
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private SentenceSuggestionsInfo fixWronglyInvalidatedWordWithSingleQuote(
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TextInfo ti, SentenceSuggestionsInfo ssi) {
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final String typedText = ti.getText();
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if (!typedText.contains(SINGLE_QUOTE)) {
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return null;
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}
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final int N = ssi.getSuggestionsCount();
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final ArrayList<Integer> additionalOffsets = new ArrayList<Integer>();
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final ArrayList<Integer> additionalLengths = new ArrayList<Integer>();
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final ArrayList<SuggestionsInfo> additionalSuggestionsInfos =
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new ArrayList<SuggestionsInfo>();
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String currentWord = null;
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for (int i = 0; i < N; ++i) {
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final SuggestionsInfo si = ssi.getSuggestionsInfoAt(i);
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final int flags = si.getSuggestionsAttributes();
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if ((flags & SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY) == 0) {
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continue;
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}
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final int offset = ssi.getOffsetAt(i);
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final int length = ssi.getLengthAt(i);
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final String subText = typedText.substring(offset, offset + length);
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final String prevWord = currentWord;
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currentWord = subText;
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if (!subText.contains(SINGLE_QUOTE)) {
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continue;
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}
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final String[] splitTexts = subText.split(SINGLE_QUOTE, -1);
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if (splitTexts == null || splitTexts.length <= 1) {
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continue;
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}
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final int splitNum = splitTexts.length;
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for (int j = 0; j < splitNum; ++j) {
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final String splitText = splitTexts[j];
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if (TextUtils.isEmpty(splitText)) {
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continue;
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}
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if (mSuggestionsCache.getSuggestionsFromCache(
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splitText, prevWord) == null) {
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continue;
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}
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final int newLength = splitText.length();
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// Neither RESULT_ATTR_IN_THE_DICTIONARY nor RESULT_ATTR_LOOKS_LIKE_TYPO
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final int newFlags = 0;
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final SuggestionsInfo newSi = new SuggestionsInfo(newFlags, EMPTY_STRING_ARRAY);
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newSi.setCookieAndSequence(si.getCookie(), si.getSequence());
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if (DBG) {
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Log.d(TAG, "Override and remove old span over: "
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+ splitText + ", " + offset + "," + newLength);
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}
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additionalOffsets.add(offset);
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additionalLengths.add(newLength);
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additionalSuggestionsInfos.add(newSi);
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}
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}
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final int additionalSize = additionalOffsets.size();
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if (additionalSize <= 0) {
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return null;
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}
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final int suggestionsSize = N + additionalSize;
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final int[] newOffsets = new int[suggestionsSize];
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final int[] newLengths = new int[suggestionsSize];
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final SuggestionsInfo[] newSuggestionsInfos = new SuggestionsInfo[suggestionsSize];
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int i;
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for (i = 0; i < N; ++i) {
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newOffsets[i] = ssi.getOffsetAt(i);
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newLengths[i] = ssi.getLengthAt(i);
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newSuggestionsInfos[i] = ssi.getSuggestionsInfoAt(i);
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}
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for (; i < suggestionsSize; ++i) {
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newOffsets[i] = additionalOffsets.get(i - N);
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newLengths[i] = additionalLengths.get(i - N);
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newSuggestionsInfos[i] = additionalSuggestionsInfos.get(i - N);
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}
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return new SentenceSuggestionsInfo(newSuggestionsInfos, newOffsets, newLengths);
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}
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@Override
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public SentenceSuggestionsInfo[] onGetSentenceSuggestionsMultiple(
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TextInfo[] textInfos, int suggestionsLimit) {
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final SentenceSuggestionsInfo[] retval = super.onGetSentenceSuggestionsMultiple(
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textInfos, suggestionsLimit);
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if (retval == null || retval.length != textInfos.length) {
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return retval;
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}
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for (int i = 0; i < retval.length; ++i) {
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final SentenceSuggestionsInfo tempSsi =
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fixWronglyInvalidatedWordWithSingleQuote(textInfos[i], retval[i]);
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if (tempSsi != null) {
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retval[i] = tempSsi;
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}
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}
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return retval;
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}
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@Override
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public SuggestionsInfo[] onGetSuggestionsMultiple(TextInfo[] textInfos,
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int suggestionsLimit, boolean sequentialWords) {
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final int length = textInfos.length;
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final SuggestionsInfo[] retval = new SuggestionsInfo[length];
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for (int i = 0; i < length; ++i) {
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final String prevWord;
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if (sequentialWords && i > 0) {
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final String prevWordCandidate = textInfos[i - 1].getText();
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// Note that an empty string would be used to indicate the initial word
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// in the future.
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prevWord = TextUtils.isEmpty(prevWordCandidate) ? null : prevWordCandidate;
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} else {
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prevWord = null;
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}
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retval[i] = onGetSuggestions(textInfos[i], prevWord, suggestionsLimit);
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retval[i].setCookieAndSequence(
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textInfos[i].getCookie(), textInfos[i].getSequence());
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}
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return retval;
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}
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// Note : this must be reentrant
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/**
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* Gets a list of suggestions for a specific string. This returns a list of possible
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* corrections for the text passed as an argument. It may split or group words, and
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* even perform grammatical analysis.
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*/
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@Override
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public SuggestionsInfo onGetSuggestions(final TextInfo textInfo,
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final int suggestionsLimit) {
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return onGetSuggestions(textInfo, null, suggestionsLimit);
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}
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private SuggestionsInfo onGetSuggestions(
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final TextInfo textInfo, final String prevWord, final int suggestionsLimit) {
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try {
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final String inText = textInfo.getText();
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final SuggestionsParams cachedSuggestionsParams =
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mSuggestionsCache.getSuggestionsFromCache(inText, prevWord);
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if (cachedSuggestionsParams != null) {
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if (DBG) {
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Log.d(TAG, "Cache hit: " + inText + ", " + cachedSuggestionsParams.mFlags);
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}
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return new SuggestionsInfo(
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cachedSuggestionsParams.mFlags, cachedSuggestionsParams.mSuggestions);
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}
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if (shouldFilterOut(inText, mScript)) {
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DictAndProximity dictInfo = null;
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try {
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dictInfo = mDictionaryPool.takeOrGetNull();
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if (null == dictInfo) return getNotInDictEmptySuggestions();
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return dictInfo.mDictionary.isValidWord(inText) ?
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getInDictEmptySuggestions() : getNotInDictEmptySuggestions();
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} finally {
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if (null != dictInfo) {
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if (!mDictionaryPool.offer(dictInfo)) {
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Log.e(TAG, "Can't re-insert a dictionary into its pool");
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}
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}
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}
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}
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final String text = inText.replaceAll(APOSTROPHE, SINGLE_QUOTE);
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// TODO: Don't gather suggestions if the limit is <= 0 unless necessary
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final SuggestionsGatherer suggestionsGatherer = new SuggestionsGatherer(text,
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mService.mSuggestionThreshold, mService.mRecommendedThreshold,
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suggestionsLimit);
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final WordComposer composer = new WordComposer();
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final int length = text.length();
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for (int i = 0; i < length; i = text.offsetByCodePoints(i, 1)) {
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final int codePoint = text.codePointAt(i);
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// The getXYForCodePointAndScript method returns (Y << 16) + X
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final int xy = SpellCheckerProximityInfo.getXYForCodePointAndScript(
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codePoint, mScript);
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if (SpellCheckerProximityInfo.NOT_A_COORDINATE_PAIR == xy) {
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composer.add(codePoint, WordComposer.NOT_A_COORDINATE,
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WordComposer.NOT_A_COORDINATE);
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} else {
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composer.add(codePoint, xy & 0xFFFF, xy >> 16);
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}
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}
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|
||||
final int capitalizeType = getCapitalizationType(text);
|
||||
boolean isInDict = true;
|
||||
DictAndProximity dictInfo = null;
|
||||
try {
|
||||
dictInfo = mDictionaryPool.takeOrGetNull();
|
||||
if (null == dictInfo) return getNotInDictEmptySuggestions();
|
||||
final ArrayList<SuggestedWordInfo> suggestions = dictInfo.mDictionary.getWords(
|
||||
composer, prevWord, dictInfo.mProximityInfo);
|
||||
for (final SuggestedWordInfo suggestion : suggestions) {
|
||||
final String suggestionStr = suggestion.mWord.toString();
|
||||
suggestionsGatherer.addWord(suggestionStr.toCharArray(), null, 0,
|
||||
suggestionStr.length(), suggestion.mScore);
|
||||
}
|
||||
isInDict = dictInfo.mDictionary.isValidWord(text);
|
||||
if (!isInDict && CAPITALIZE_NONE != capitalizeType) {
|
||||
// We want to test the word again if it's all caps or first caps only.
|
||||
// If it's fully down, we already tested it, if it's mixed case, we don't
|
||||
// want to test a lowercase version of it.
|
||||
isInDict = dictInfo.mDictionary.isValidWord(text.toLowerCase(mLocale));
|
||||
}
|
||||
} finally {
|
||||
if (null != dictInfo) {
|
||||
if (!mDictionaryPool.offer(dictInfo)) {
|
||||
Log.e(TAG, "Can't re-insert a dictionary into its pool");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
final SuggestionsGatherer.Result result = suggestionsGatherer.getResults(
|
||||
capitalizeType, mLocale);
|
||||
|
||||
if (DBG) {
|
||||
Log.i(TAG, "Spell checking results for " + text + " with suggestion limit "
|
||||
+ suggestionsLimit);
|
||||
Log.i(TAG, "IsInDict = " + isInDict);
|
||||
Log.i(TAG, "LooksLikeTypo = " + (!isInDict));
|
||||
Log.i(TAG, "HasRecommendedSuggestions = " + result.mHasRecommendedSuggestions);
|
||||
if (null != result.mSuggestions) {
|
||||
for (String suggestion : result.mSuggestions) {
|
||||
Log.i(TAG, suggestion);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
final int flags =
|
||||
(isInDict ? SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY
|
||||
: SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO)
|
||||
| (result.mHasRecommendedSuggestions
|
||||
? SuggestionsInfoCompatUtils
|
||||
.getValueOf_RESULT_ATTR_HAS_RECOMMENDED_SUGGESTIONS()
|
||||
: 0);
|
||||
final SuggestionsInfo retval = new SuggestionsInfo(flags, result.mSuggestions);
|
||||
mSuggestionsCache.putSuggestionsToCache(text, prevWord, result.mSuggestions, flags);
|
||||
return retval;
|
||||
} catch (RuntimeException e) {
|
||||
// Don't kill the keyboard if there is a bug in the spell checker
|
||||
if (DBG) {
|
||||
throw e;
|
||||
} else {
|
||||
Log.e(TAG, "Exception while spellcheking: " + e);
|
||||
return getNotInDictEmptySuggestions();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,420 @@
|
|||
/*
|
||||
* Copyright (C) 2012 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
|
||||
* use this file except in compliance with the License. You may obtain a copy of
|
||||
* the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||
* License for the specific language governing permissions and limitations under
|
||||
* the License.
|
||||
*/
|
||||
|
||||
package com.android.inputmethod.latin.spellcheck;
|
||||
|
||||
|
||||
import android.service.textservice.SpellCheckerService.Session;
|
||||
import android.text.TextUtils;
|
||||
import android.util.Log;
|
||||
import android.util.LruCache;
|
||||
import android.view.textservice.SentenceSuggestionsInfo;
|
||||
import android.view.textservice.SuggestionsInfo;
|
||||
import android.view.textservice.TextInfo;
|
||||
|
||||
import com.android.inputmethod.compat.SuggestionsInfoCompatUtils;
|
||||
import com.android.inputmethod.latin.LocaleUtils;
|
||||
import com.android.inputmethod.latin.WordComposer;
|
||||
import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
|
||||
import com.android.inputmethod.latin.spellcheck.AndroidSpellCheckerService.SuggestionsGatherer;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Locale;
|
||||
|
||||
public class AndroidSpellCheckerSession extends Session {
|
||||
private static final String TAG = AndroidSpellCheckerSession.class.getSimpleName();
|
||||
private static final boolean DBG = false;
|
||||
private final static String[] EMPTY_STRING_ARRAY = new String[0];
|
||||
|
||||
// Immutable, but need the locale which is not available in the constructor yet
|
||||
private DictionaryPool mDictionaryPool;
|
||||
// Likewise
|
||||
private Locale mLocale;
|
||||
// Cache this for performance
|
||||
private int mScript; // One of SCRIPT_LATIN or SCRIPT_CYRILLIC for now.
|
||||
private final AndroidSpellCheckerService mService;
|
||||
private final SuggestionsCache mSuggestionsCache = new SuggestionsCache();
|
||||
|
||||
private static class SuggestionsParams {
|
||||
public final String[] mSuggestions;
|
||||
public final int mFlags;
|
||||
public SuggestionsParams(String[] suggestions, int flags) {
|
||||
mSuggestions = suggestions;
|
||||
mFlags = flags;
|
||||
}
|
||||
}
|
||||
|
||||
private static class SuggestionsCache {
|
||||
private static final char CHAR_DELIMITER = '\uFFFC';
|
||||
private static final int MAX_CACHE_SIZE = 50;
|
||||
private final LruCache<String, SuggestionsParams> mUnigramSuggestionsInfoCache =
|
||||
new LruCache<String, SuggestionsParams>(MAX_CACHE_SIZE);
|
||||
|
||||
// TODO: Support n-gram input
|
||||
private static String generateKey(String query, String prevWord) {
|
||||
if (TextUtils.isEmpty(query) || TextUtils.isEmpty(prevWord)) {
|
||||
return query;
|
||||
}
|
||||
return query + CHAR_DELIMITER + prevWord;
|
||||
}
|
||||
|
||||
// TODO: Support n-gram input
|
||||
public SuggestionsParams getSuggestionsFromCache(String query, String prevWord) {
|
||||
return mUnigramSuggestionsInfoCache.get(generateKey(query, prevWord));
|
||||
}
|
||||
|
||||
// TODO: Support n-gram input
|
||||
public void putSuggestionsToCache(
|
||||
String query, String prevWord, String[] suggestions, int flags) {
|
||||
if (suggestions == null || TextUtils.isEmpty(query)) {
|
||||
return;
|
||||
}
|
||||
mUnigramSuggestionsInfoCache.put(
|
||||
generateKey(query, prevWord), new SuggestionsParams(suggestions, flags));
|
||||
}
|
||||
}
|
||||
|
||||
AndroidSpellCheckerSession(final AndroidSpellCheckerService service) {
|
||||
mService = service;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void onCreate() {
|
||||
final String localeString = getLocale();
|
||||
mDictionaryPool = mService.getDictionaryPool(localeString);
|
||||
mLocale = LocaleUtils.constructLocaleFromString(localeString);
|
||||
mScript = AndroidSpellCheckerService.getScriptFromLocale(mLocale);
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns whether the code point is a letter that makes sense for the specified
|
||||
* locale for this spell checker.
|
||||
* The dictionaries supported by Latin IME are described in res/xml/spellchecker.xml
|
||||
* and is limited to EFIGS languages and Russian.
|
||||
* Hence at the moment this explicitly tests for Cyrillic characters or Latin characters
|
||||
* as appropriate, and explicitly excludes CJK, Arabic and Hebrew characters.
|
||||
*/
|
||||
private static boolean isLetterCheckableByLanguage(final int codePoint,
|
||||
final int script) {
|
||||
switch (script) {
|
||||
case AndroidSpellCheckerService.SCRIPT_LATIN:
|
||||
// Our supported latin script dictionaries (EFIGS) at the moment only include
|
||||
// characters in the C0, C1, Latin Extended A and B, IPA extensions unicode
|
||||
// blocks. As it happens, those are back-to-back in the code range 0x40 to 0x2AF,
|
||||
// so the below is a very efficient way to test for it. As for the 0-0x3F, it's
|
||||
// excluded from isLetter anyway.
|
||||
return codePoint <= 0x2AF && Character.isLetter(codePoint);
|
||||
case AndroidSpellCheckerService.SCRIPT_CYRILLIC:
|
||||
// All Cyrillic characters are in the 400~52F block. There are some in the upper
|
||||
// Unicode range, but they are archaic characters that are not used in modern
|
||||
// russian and are not used by our dictionary.
|
||||
return codePoint >= 0x400 && codePoint <= 0x52F && Character.isLetter(codePoint);
|
||||
default:
|
||||
// Should never come here
|
||||
throw new RuntimeException("Impossible value of script: " + script);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Finds out whether a particular string should be filtered out of spell checking.
|
||||
*
|
||||
* This will loosely match URLs, numbers, symbols. To avoid always underlining words that
|
||||
* we know we will never recognize, this accepts a script identifier that should be one
|
||||
* of the SCRIPT_* constants defined above, to rule out quickly characters from very
|
||||
* different languages.
|
||||
*
|
||||
* @param text the string to evaluate.
|
||||
* @param script the identifier for the script this spell checker recognizes
|
||||
* @return true if we should filter this text out, false otherwise
|
||||
*/
|
||||
private static boolean shouldFilterOut(final String text, final int script) {
|
||||
if (TextUtils.isEmpty(text) || text.length() <= 1) return true;
|
||||
|
||||
// TODO: check if an equivalent processing can't be done more quickly with a
|
||||
// compiled regexp.
|
||||
// Filter by first letter
|
||||
final int firstCodePoint = text.codePointAt(0);
|
||||
// Filter out words that don't start with a letter or an apostrophe
|
||||
if (!isLetterCheckableByLanguage(firstCodePoint, script)
|
||||
&& '\'' != firstCodePoint) return true;
|
||||
|
||||
// Filter contents
|
||||
final int length = text.length();
|
||||
int letterCount = 0;
|
||||
for (int i = 0; i < length; i = text.offsetByCodePoints(i, 1)) {
|
||||
final int codePoint = text.codePointAt(i);
|
||||
// Any word containing a '@' is probably an e-mail address
|
||||
// Any word containing a '/' is probably either an ad-hoc combination of two
|
||||
// words or a URI - in either case we don't want to spell check that
|
||||
if ('@' == codePoint || '/' == codePoint) return true;
|
||||
if (isLetterCheckableByLanguage(codePoint, script)) ++letterCount;
|
||||
}
|
||||
// Guestimate heuristic: perform spell checking if at least 3/4 of the characters
|
||||
// in this word are letters
|
||||
return (letterCount * 4 < length * 3);
|
||||
}
|
||||
|
||||
private SentenceSuggestionsInfo fixWronglyInvalidatedWordWithSingleQuote(
|
||||
TextInfo ti, SentenceSuggestionsInfo ssi) {
|
||||
final String typedText = ti.getText();
|
||||
if (!typedText.contains(AndroidSpellCheckerService.SINGLE_QUOTE)) {
|
||||
return null;
|
||||
}
|
||||
final int N = ssi.getSuggestionsCount();
|
||||
final ArrayList<Integer> additionalOffsets = new ArrayList<Integer>();
|
||||
final ArrayList<Integer> additionalLengths = new ArrayList<Integer>();
|
||||
final ArrayList<SuggestionsInfo> additionalSuggestionsInfos =
|
||||
new ArrayList<SuggestionsInfo>();
|
||||
String currentWord = null;
|
||||
for (int i = 0; i < N; ++i) {
|
||||
final SuggestionsInfo si = ssi.getSuggestionsInfoAt(i);
|
||||
final int flags = si.getSuggestionsAttributes();
|
||||
if ((flags & SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY) == 0) {
|
||||
continue;
|
||||
}
|
||||
final int offset = ssi.getOffsetAt(i);
|
||||
final int length = ssi.getLengthAt(i);
|
||||
final String subText = typedText.substring(offset, offset + length);
|
||||
final String prevWord = currentWord;
|
||||
currentWord = subText;
|
||||
if (!subText.contains(AndroidSpellCheckerService.SINGLE_QUOTE)) {
|
||||
continue;
|
||||
}
|
||||
final String[] splitTexts = subText.split(AndroidSpellCheckerService.SINGLE_QUOTE, -1);
|
||||
if (splitTexts == null || splitTexts.length <= 1) {
|
||||
continue;
|
||||
}
|
||||
final int splitNum = splitTexts.length;
|
||||
for (int j = 0; j < splitNum; ++j) {
|
||||
final String splitText = splitTexts[j];
|
||||
if (TextUtils.isEmpty(splitText)) {
|
||||
continue;
|
||||
}
|
||||
if (mSuggestionsCache.getSuggestionsFromCache(
|
||||
splitText, prevWord) == null) {
|
||||
continue;
|
||||
}
|
||||
final int newLength = splitText.length();
|
||||
// Neither RESULT_ATTR_IN_THE_DICTIONARY nor RESULT_ATTR_LOOKS_LIKE_TYPO
|
||||
final int newFlags = 0;
|
||||
final SuggestionsInfo newSi = new SuggestionsInfo(newFlags, EMPTY_STRING_ARRAY);
|
||||
newSi.setCookieAndSequence(si.getCookie(), si.getSequence());
|
||||
if (DBG) {
|
||||
Log.d(TAG, "Override and remove old span over: "
|
||||
+ splitText + ", " + offset + "," + newLength);
|
||||
}
|
||||
additionalOffsets.add(offset);
|
||||
additionalLengths.add(newLength);
|
||||
additionalSuggestionsInfos.add(newSi);
|
||||
}
|
||||
}
|
||||
final int additionalSize = additionalOffsets.size();
|
||||
if (additionalSize <= 0) {
|
||||
return null;
|
||||
}
|
||||
final int suggestionsSize = N + additionalSize;
|
||||
final int[] newOffsets = new int[suggestionsSize];
|
||||
final int[] newLengths = new int[suggestionsSize];
|
||||
final SuggestionsInfo[] newSuggestionsInfos = new SuggestionsInfo[suggestionsSize];
|
||||
int i;
|
||||
for (i = 0; i < N; ++i) {
|
||||
newOffsets[i] = ssi.getOffsetAt(i);
|
||||
newLengths[i] = ssi.getLengthAt(i);
|
||||
newSuggestionsInfos[i] = ssi.getSuggestionsInfoAt(i);
|
||||
}
|
||||
for (; i < suggestionsSize; ++i) {
|
||||
newOffsets[i] = additionalOffsets.get(i - N);
|
||||
newLengths[i] = additionalLengths.get(i - N);
|
||||
newSuggestionsInfos[i] = additionalSuggestionsInfos.get(i - N);
|
||||
}
|
||||
return new SentenceSuggestionsInfo(newSuggestionsInfos, newOffsets, newLengths);
|
||||
}
|
||||
|
||||
@Override
|
||||
public SentenceSuggestionsInfo[] onGetSentenceSuggestionsMultiple(
|
||||
TextInfo[] textInfos, int suggestionsLimit) {
|
||||
final SentenceSuggestionsInfo[] retval = super.onGetSentenceSuggestionsMultiple(
|
||||
textInfos, suggestionsLimit);
|
||||
if (retval == null || retval.length != textInfos.length) {
|
||||
return retval;
|
||||
}
|
||||
for (int i = 0; i < retval.length; ++i) {
|
||||
final SentenceSuggestionsInfo tempSsi =
|
||||
fixWronglyInvalidatedWordWithSingleQuote(textInfos[i], retval[i]);
|
||||
if (tempSsi != null) {
|
||||
retval[i] = tempSsi;
|
||||
}
|
||||
}
|
||||
return retval;
|
||||
}
|
||||
|
||||
@Override
|
||||
public SuggestionsInfo[] onGetSuggestionsMultiple(TextInfo[] textInfos,
|
||||
int suggestionsLimit, boolean sequentialWords) {
|
||||
final int length = textInfos.length;
|
||||
final SuggestionsInfo[] retval = new SuggestionsInfo[length];
|
||||
for (int i = 0; i < length; ++i) {
|
||||
final String prevWord;
|
||||
if (sequentialWords && i > 0) {
|
||||
final String prevWordCandidate = textInfos[i - 1].getText();
|
||||
// Note that an empty string would be used to indicate the initial word
|
||||
// in the future.
|
||||
prevWord = TextUtils.isEmpty(prevWordCandidate) ? null : prevWordCandidate;
|
||||
} else {
|
||||
prevWord = null;
|
||||
}
|
||||
retval[i] = onGetSuggestions(textInfos[i], prevWord, suggestionsLimit);
|
||||
retval[i].setCookieAndSequence(
|
||||
textInfos[i].getCookie(), textInfos[i].getSequence());
|
||||
}
|
||||
return retval;
|
||||
}
|
||||
|
||||
// Note : this must be reentrant
|
||||
/**
|
||||
* Gets a list of suggestions for a specific string. This returns a list of possible
|
||||
* corrections for the text passed as an argument. It may split or group words, and
|
||||
* even perform grammatical analysis.
|
||||
*/
|
||||
@Override
|
||||
public SuggestionsInfo onGetSuggestions(final TextInfo textInfo,
|
||||
final int suggestionsLimit) {
|
||||
return onGetSuggestions(textInfo, null, suggestionsLimit);
|
||||
}
|
||||
|
||||
private SuggestionsInfo onGetSuggestions(
|
||||
final TextInfo textInfo, final String prevWord, final int suggestionsLimit) {
|
||||
try {
|
||||
final String inText = textInfo.getText();
|
||||
final SuggestionsParams cachedSuggestionsParams =
|
||||
mSuggestionsCache.getSuggestionsFromCache(inText, prevWord);
|
||||
if (cachedSuggestionsParams != null) {
|
||||
if (DBG) {
|
||||
Log.d(TAG, "Cache hit: " + inText + ", " + cachedSuggestionsParams.mFlags);
|
||||
}
|
||||
return new SuggestionsInfo(
|
||||
cachedSuggestionsParams.mFlags, cachedSuggestionsParams.mSuggestions);
|
||||
}
|
||||
|
||||
if (shouldFilterOut(inText, mScript)) {
|
||||
DictAndProximity dictInfo = null;
|
||||
try {
|
||||
dictInfo = mDictionaryPool.takeOrGetNull();
|
||||
if (null == dictInfo) {
|
||||
return AndroidSpellCheckerService.getNotInDictEmptySuggestions();
|
||||
}
|
||||
return dictInfo.mDictionary.isValidWord(inText)
|
||||
? AndroidSpellCheckerService.getInDictEmptySuggestions()
|
||||
: AndroidSpellCheckerService.getNotInDictEmptySuggestions();
|
||||
} finally {
|
||||
if (null != dictInfo) {
|
||||
if (!mDictionaryPool.offer(dictInfo)) {
|
||||
Log.e(TAG, "Can't re-insert a dictionary into its pool");
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
final String text = inText.replaceAll(
|
||||
AndroidSpellCheckerService.APOSTROPHE, AndroidSpellCheckerService.SINGLE_QUOTE);
|
||||
|
||||
// TODO: Don't gather suggestions if the limit is <= 0 unless necessary
|
||||
//final SuggestionsGatherer suggestionsGatherer = new SuggestionsGatherer(text,
|
||||
//mService.mSuggestionThreshold, mService.mRecommendedThreshold,
|
||||
//suggestionsLimit);
|
||||
final SuggestionsGatherer suggestionsGatherer = mService.newSuggestionsGatherer(
|
||||
text, suggestionsLimit);
|
||||
final WordComposer composer = new WordComposer();
|
||||
final int length = text.length();
|
||||
for (int i = 0; i < length; i = text.offsetByCodePoints(i, 1)) {
|
||||
final int codePoint = text.codePointAt(i);
|
||||
// The getXYForCodePointAndScript method returns (Y << 16) + X
|
||||
final int xy = SpellCheckerProximityInfo.getXYForCodePointAndScript(
|
||||
codePoint, mScript);
|
||||
if (SpellCheckerProximityInfo.NOT_A_COORDINATE_PAIR == xy) {
|
||||
composer.add(codePoint, WordComposer.NOT_A_COORDINATE,
|
||||
WordComposer.NOT_A_COORDINATE);
|
||||
} else {
|
||||
composer.add(codePoint, xy & 0xFFFF, xy >> 16);
|
||||
}
|
||||
}
|
||||
|
||||
final int capitalizeType = AndroidSpellCheckerService.getCapitalizationType(text);
|
||||
boolean isInDict = true;
|
||||
DictAndProximity dictInfo = null;
|
||||
try {
|
||||
dictInfo = mDictionaryPool.takeOrGetNull();
|
||||
if (null == dictInfo) {
|
||||
return AndroidSpellCheckerService.getNotInDictEmptySuggestions();
|
||||
}
|
||||
final ArrayList<SuggestedWordInfo> suggestions = dictInfo.mDictionary.getWords(
|
||||
composer, prevWord, dictInfo.mProximityInfo);
|
||||
for (final SuggestedWordInfo suggestion : suggestions) {
|
||||
final String suggestionStr = suggestion.mWord.toString();
|
||||
suggestionsGatherer.addWord(suggestionStr.toCharArray(), null, 0,
|
||||
suggestionStr.length(), suggestion.mScore);
|
||||
}
|
||||
isInDict = dictInfo.mDictionary.isValidWord(text);
|
||||
if (!isInDict && AndroidSpellCheckerService.CAPITALIZE_NONE != capitalizeType) {
|
||||
// We want to test the word again if it's all caps or first caps only.
|
||||
// If it's fully down, we already tested it, if it's mixed case, we don't
|
||||
// want to test a lowercase version of it.
|
||||
isInDict = dictInfo.mDictionary.isValidWord(text.toLowerCase(mLocale));
|
||||
}
|
||||
} finally {
|
||||
if (null != dictInfo) {
|
||||
if (!mDictionaryPool.offer(dictInfo)) {
|
||||
Log.e(TAG, "Can't re-insert a dictionary into its pool");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
final SuggestionsGatherer.Result result = suggestionsGatherer.getResults(
|
||||
capitalizeType, mLocale);
|
||||
|
||||
if (DBG) {
|
||||
Log.i(TAG, "Spell checking results for " + text + " with suggestion limit "
|
||||
+ suggestionsLimit);
|
||||
Log.i(TAG, "IsInDict = " + isInDict);
|
||||
Log.i(TAG, "LooksLikeTypo = " + (!isInDict));
|
||||
Log.i(TAG, "HasRecommendedSuggestions = " + result.mHasRecommendedSuggestions);
|
||||
if (null != result.mSuggestions) {
|
||||
for (String suggestion : result.mSuggestions) {
|
||||
Log.i(TAG, suggestion);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
final int flags =
|
||||
(isInDict ? SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY
|
||||
: SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO)
|
||||
| (result.mHasRecommendedSuggestions
|
||||
? SuggestionsInfoCompatUtils
|
||||
.getValueOf_RESULT_ATTR_HAS_RECOMMENDED_SUGGESTIONS()
|
||||
: 0);
|
||||
final SuggestionsInfo retval = new SuggestionsInfo(flags, result.mSuggestions);
|
||||
mSuggestionsCache.putSuggestionsToCache(text, prevWord, result.mSuggestions, flags);
|
||||
return retval;
|
||||
} catch (RuntimeException e) {
|
||||
// Don't kill the keyboard if there is a bug in the spell checker
|
||||
if (DBG) {
|
||||
throw e;
|
||||
} else {
|
||||
Log.e(TAG, "Exception while spellcheking: " + e);
|
||||
return AndroidSpellCheckerService.getNotInDictEmptySuggestions();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue