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Merge "Introduce script matching for enabling default IME subtypes." into nyc-dev

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am: d22b31bef7

* commit 'd22b31bef7c5bca59225eb61b0b0870b82470afa':
  Introduce script matching for enabling default IME subtypes.
This commit is contained in:
Seigo Nonaka
2016-03-06 03:07:50 +00:00
committed by android-build-merger
parent f8dfd32d31 d22b31bef7
commit e82af2f831
2 changed files with 303 additions and 76 deletions
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218
core/java/com/android/internal/inputmethod/LocaleUtils.java
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@@ -18,15 +18,17 @@ package com.android.internal.inputmethod;
import com.android.internal.annotations.VisibleForTesting;
import android.annotation.IntRange;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.text.TextUtils;
import android.icu.util.ULocale;
import android.util.LocaleList;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Objects;
public final class LocaleUtils {
@@ -36,12 +38,120 @@ public final class LocaleUtils {
Locale get(@Nullable T source);
}
@Nullable
private static String getLanguage(@Nullable Locale locale) {
if (locale == null) {
return null;
/**
* Calculates a matching score for the single desired locale.
*
* <p>See {@link LocaleUtils#calculateMatchingScore(ULocale, LocaleList, byte[])} for
* details.</p>
*/
@IntRange(from=1, to=3)
private static byte calculateMatchingSubScore(@NonNull final ULocale supported,
@NonNull final ULocale desired) {
// Assuming supported/desired is fully expanded.
if (supported.equals(desired)) {
return 3; // Exact match.
}
// Skip language matching since it was already done in calculateMatchingScore.
final String supportedScript = supported.getScript();
if (supportedScript.isEmpty() || !supportedScript.equals(desired.getScript())) {
// TODO: Need subscript matching. For example, Hanb should match with Bopo.
return 1;
}
final String supportedCountry = supported.getCountry();
if (supportedCountry.isEmpty() || !supportedCountry.equals(desired.getCountry())) {
return 2;
}
// Ignore others e.g. variants, extensions.
return 3;
}
/**
* Calculates a matching score for the desired locale list.
*
* <p>The supported locale gets a matching score of 3 if all language, script and country of the
* supported locale matches with the desired locale. The supported locale gets a matching
* score of 2 if the language and script of the supported locale matches with the desired
* locale. The supported locale gets a matching score of 1 if only language of the supported
* locale matches with the desired locale. The supported locale gets a matching score of 0 if
* the language of the supported locale doesn't match with the desired locale.</p>
*
* <p>This function returns {@code false} if supported locale doesn't match with any desired
* locale list. Otherwise, this function returns {@code true}.</p>
*/
private static boolean calculateMatchingScore(@NonNull final ULocale supported,
@NonNull final LocaleList desired, @NonNull byte[] out) {
if (desired.isEmpty()) {
return false;
}
boolean allZeros = true;
for (int i = 0; i < desired.size(); ++i) {
final Locale loc = desired.get(i);
if (!loc.getLanguage().equals(supported.getLanguage())) {
// TODO: cache the result of addLikelySubtags if it is slow.
out[i] = 0;
} else {
out[i] = calculateMatchingSubScore(
supported, ULocale.addLikelySubtags(ULocale.forLocale(loc)));
if (allZeros && out[i] != 0) {
allZeros = false;
}
}
}
return !allZeros;
}
private static final class ScoreEntry implements Comparable<ScoreEntry> {
public int index = -1;
@NonNull public byte[] score; // matching score of the i-th system languages.
ScoreEntry(int capacity) {
score = new byte[capacity];
}
/**
* Update score and index if the given score is better than this.
*/
public void updateIfBetter(@NonNull byte[] newScore, int newIndex) {
if (isBetterThan(score) != 1) {
return;
}
for (int i = 0; i < score.length; ++i) {
score[i] = newScore[i];
}
index = newIndex;
}
/**
* Determines given score is better than current.
*
* <p>Compares the matching score for the first priority locale. If the given score has
* higher score than current score, returns 1. If the current score has higher score than
* given score, returns -1. Otherwise, do the same comparison for the next priority locale.
* If given score and current score is same for the all system locale, returns 0.</p>
*/
private int isBetterThan(@NonNull byte[] other) {
for (int i = 0; i < score.length; ++i) {
if (score[i] < other[i]) {
return 1;
} else if (score[i] > other[i]) {
return -1;
}
}
return 0;
}
@Override
public int compareTo(ScoreEntry other) {
return isBetterThan(score);
}
return locale.getLanguage();
}
/**
@@ -52,14 +162,8 @@ public final class LocaleUtils {
* {@code "en-GB", "ja", "en-AU", "fr-CA", "en-IN"} is specified to {@code preferredLanguages},
* this method tries to copy at most one English locale, at most one Japanese, and at most one
* French locale from {@code source} to {@code dest}. Here the best matching English locale
* will be searched from {@code source} as follows.
* <ol>
* <li>The first instance in {@code sources} that exactly matches {@code "en-GB"}</li>
* <li>The first instance in {@code sources} that exactly matches {@code "en-AU"}</li>
* <li>The first instance in {@code sources} that exactly matches {@code "en-IN"}</li>
* <li>The first instance in {@code sources} that partially matches {@code "en"}</li>
* </ol>
* <p>Then this method iterates the same algorithm for Japanese then French.</p>
* will be searched from {@code source} based on matching score. For the score design, see
* {@link LocaleUtils#calculateMatchingScore(ULocale, LocaleList, byte[])}</p>
*
* @param sources Source items to be filtered.
* @param extractor Type converter from the source items to {@link Locale} object.
@@ -74,69 +178,31 @@ public final class LocaleUtils {
@NonNull LocaleExtractor<T> extractor,
@NonNull LocaleList preferredLanguages,
@NonNull ArrayList<T> dest) {
final Locale[] availableLocales = new Locale[sources.size()];
for (int i = 0; i < availableLocales.length; ++i) {
availableLocales[i] = extractor.get(sources.get(i));
}
final Locale[] sortedPreferredLanguages = new Locale[preferredLanguages.size()];
if (sortedPreferredLanguages.length > 0) {
int nextIndex = 0;
final int N = preferredLanguages.size();
languageLoop:
for (int i = 0; i < N; ++i) {
final String language = getLanguage(preferredLanguages.get(i));
for (int j = 0; j < nextIndex; ++j) {
if (TextUtils.equals(getLanguage(sortedPreferredLanguages[j]), language)) {
continue languageLoop;
}
}
for (int j = i; j < N; ++j) {
final Locale locale = preferredLanguages.get(j);
if (TextUtils.equals(language, getLanguage(locale))) {
sortedPreferredLanguages[nextIndex] = locale;
++nextIndex;
}
}
final HashMap<String, ScoreEntry> scoreboard = new HashMap<>();
final byte[] score = new byte[preferredLanguages.size()];
for (int i = 0; i < sources.size(); ++i) {
final Locale loc = extractor.get(sources.get(i));
if (loc == null ||
!calculateMatchingScore(ULocale.addLikelySubtags(ULocale.forLocale(loc)),
preferredLanguages, score)) {
continue;
}
final String lang = loc.getLanguage();
ScoreEntry bestScore = scoreboard.get(lang);
if (bestScore == null) {
bestScore = new ScoreEntry(score.length);
scoreboard.put(lang, bestScore);
}
bestScore.updateIfBetter(score, i);
}
for (int languageIndex = 0; languageIndex < sortedPreferredLanguages.length;) {
// Finding the range.
final String language = getLanguage(sortedPreferredLanguages[languageIndex]);
int nextLanguageIndex = languageIndex;
for (; nextLanguageIndex < sortedPreferredLanguages.length; ++nextLanguageIndex) {
final Locale locale = sortedPreferredLanguages[nextLanguageIndex];
if (!TextUtils.equals(getLanguage(locale), language)) {
break;
}
}
// Check exact match
boolean found = false;
for (int i = languageIndex; !found && i < nextLanguageIndex; ++i) {
final Locale locale = sortedPreferredLanguages[i];
for (int j = 0; j < availableLocales.length; ++j) {
if (!Objects.equals(locale, availableLocales[j])) {
continue;
}
dest.add(sources.get(j));
found = true;
break;
}
}
if (!found) {
// No exact match. Use language match.
for (int j = 0; j < availableLocales.length; ++j) {
if (!TextUtils.equals(language, getLanguage(availableLocales[j]))) {
continue;
}
dest.add(sources.get(j));
break;
}
}
languageIndex = nextLanguageIndex;
final ScoreEntry[] result = scoreboard.values().toArray(new ScoreEntry[scoreboard.size()]);
Arrays.sort(result);
for (final ScoreEntry entry : result) {
dest.add(sources.get(entry.index));
}
}
}
}