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/*
* Copyright (C) 2015 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.
*/
#define LOG_TAG "Minikin"
#include "LocaleListCache.h"
#include <unordered_set>
#include <log/log.h>
#include <minikin/Hasher.h>
#include <minikin/LocaleList.h>
#include <unicode/uloc.h>
#include <unicode/umachine.h>
#include "Locale.h"
#include "MinikinInternal.h"
namespace minikin {
// Returns the text length of output.
static size_t toLanguageTag(char* output, size_t outSize, const StringPiece& locale) {
output[0] = '\0';
if (locale.empty()) {
return 0;
}
std::string localeString = locale.toString(); // ICU only understands C-style string.
size_t outLength = 0;
UErrorCode uErr = U_ZERO_ERROR;
outLength = uloc_canonicalize(localeString.c_str(), output, outSize, &uErr);
if (U_FAILURE(uErr) || (uErr == U_STRING_NOT_TERMINATED_WARNING)) {
// unable to build a proper locale identifier
ALOGD("uloc_canonicalize(\"%s\") failed: %s", localeString.c_str(), u_errorName(uErr));
output[0] = '\0';
return 0;
}
// Preserve "" and "_****" since uloc_addLikelySubtags changes "" to "en_Latn_US".
if (outLength == 0 || (outLength == 5 && output[0] == '_')) {
if (output[0] == '_') {
output[0] = '-';
}
std::string buf(output, outLength);
outLength = (size_t)snprintf(output, outSize, "und%s", buf.c_str());
return outLength;
}
char likelyChars[ULOC_FULLNAME_CAPACITY];
uErr = U_ZERO_ERROR;
uloc_addLikelySubtags(output, likelyChars, ULOC_FULLNAME_CAPACITY, &uErr);
if (U_FAILURE(uErr) || (uErr == U_STRING_NOT_TERMINATED_WARNING)) {
// unable to build a proper locale identifier
ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s", output, u_errorName(uErr));
output[0] = '\0';
return 0;
}
uErr = U_ZERO_ERROR;
outLength = uloc_toLanguageTag(likelyChars, output, outSize, false, &uErr);
if (U_FAILURE(uErr) || (uErr == U_STRING_NOT_TERMINATED_WARNING)) {
// unable to build a proper locale identifier
ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars, u_errorName(uErr));
output[0] = '\0';
return 0;
}
return outLength;
}
static std::vector<Locale> parseLocaleList(const std::string& input) {
std::vector<Locale> result;
char langTag[ULOC_FULLNAME_CAPACITY];
std::unordered_set<uint64_t> seen;
SplitIterator it(input, ',');
while (it.hasNext()) {
StringPiece localeStr = it.next();
size_t length = toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeStr);
Locale locale(StringPiece(langTag, length));
if (locale.isUnsupported()) {
continue;
}
const bool isNewLocale = seen.insert(locale.getIdentifier()).second;
if (!isNewLocale) {
continue;
}
result.push_back(locale);
if (result.size() >= FONT_LOCALE_LIMIT) {
break;
}
}
return result;
}
size_t LocaleListCache::LocaleVectorHash::operator()(const std::vector<Locale>& locales) const {
Hasher hasher;
for (const auto& locale : locales) {
uint64_t id = locale.getIdentifier();
hasher.update(static_cast<uint32_t>((id >> 32) & 0xFFFFFFFF));
hasher.update(static_cast<uint32_t>(id & 0xFFFFFFFF));
}
return hasher.hash();
}
LocaleListCache::LocaleListCache() {
// Insert an empty locale list for mapping default locale list to kEmptyLocaleListId.
// The default locale list has only one Locale and it is the unsupported locale.
mLocaleLists.emplace_back();
mLocaleListLookupTable.emplace(std::vector<Locale>(), kEmptyLocaleListId);
mLocaleListStringCache.emplace("", kEmptyLocaleListId);
}
uint32_t LocaleListCache::getIdInternal(const std::string& locales) {
std::lock_guard<std::mutex> lock(mMutex);
const auto& it = mLocaleListStringCache.find(locales);
if (it != mLocaleListStringCache.end()) {
return it->second;
}
uint32_t id = getIdInternal(parseLocaleList(locales));
mLocaleListStringCache.emplace(locales, id);
return id;
}
uint32_t LocaleListCache::getIdInternal(std::vector<Locale>&& locales) {
if (locales.empty()) {
return kEmptyLocaleListId;
}
const auto& it = mLocaleListLookupTable.find(locales);
if (it != mLocaleListLookupTable.end()) {
return it->second;
}
// Given locale list is not in cache. Insert it and return newly assigned ID.
const uint32_t nextId = mLocaleLists.size();
mLocaleListLookupTable.emplace(locales, nextId);
LocaleList fontLocales(std::move(locales));
mLocaleLists.push_back(std::move(fontLocales));
return nextId;
}
uint32_t LocaleListCache::readFromInternal(BufferReader* reader) {
uint32_t size = reader->read<uint32_t>();
std::vector<Locale> locales;
locales.reserve(size);
for (uint32_t i = 0; i < size; i++) {
locales.emplace_back(reader->read<uint64_t>());
}
std::lock_guard<std::mutex> lock(mMutex);
return getIdInternal(std::move(locales));
}
void LocaleListCache::writeToInternal(BufferWriter* writer, uint32_t id) {
const LocaleList& localeList = getByIdInternal(id);
writer->write<uint32_t>(localeList.size());
for (size_t i = 0; i < localeList.size(); i++) {
writer->write<uint64_t>(localeList[i].getIdentifier());
}
}
const LocaleList& LocaleListCache::getByIdInternal(uint32_t id) {
std::lock_guard<std::mutex> lock(mMutex);
MINIKIN_ASSERT(id < mLocaleLists.size(), "Lookup by unknown locale list ID.");
return mLocaleLists[id];
}
} // namespace minikin
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