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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 "FontLanguageListCache.h"
#include <cutils/log.h>
#include <unicode/uloc.h>
#include <unordered_set>
#include "MinikinInternal.h"
#include "FontLanguage.h"
namespace android {
const uint32_t FontLanguageListCache::kEmptyListId;
// Returns the text length of output.
static size_t toLanguageTag(char* output, size_t outSize, const std::string& locale) {
output[0] = '\0';
if (locale.empty()) {
return 0;
}
size_t outLength = 0;
UErrorCode uErr = U_ZERO_ERROR;
outLength = uloc_canonicalize(locale.c_str(), output, outSize, &uErr);
if (U_FAILURE(uErr)) {
// unable to build a proper language identifier
ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale.c_str(), u_errorName(uErr));
output[0] = '\0';
return 0;
}
// Preserve "und" and "und-****" since uloc_addLikelySubtags changes "und" to "en-Latn-US".
if (strncmp(output, "und", 3) == 0 &&
(outLength == 3 || (outLength == 8 && output[3] == '_'))) {
return outLength;
}
char likelyChars[ULOC_FULLNAME_CAPACITY];
uErr = U_ZERO_ERROR;
uloc_addLikelySubtags(output, likelyChars, ULOC_FULLNAME_CAPACITY, &uErr);
if (U_FAILURE(uErr)) {
// unable to build a proper language 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)) {
// unable to build a proper language identifier
ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars, u_errorName(uErr));
output[0] = '\0';
return 0;
}
#ifdef VERBOSE_DEBUG
ALOGD("ICU normalized '%s' to '%s'", locale.c_str(), output);
#endif
return outLength;
}
static std::vector<FontLanguage> parseLanguageList(const std::string& input) {
std::vector<FontLanguage> result;
size_t currentIdx = 0;
size_t commaLoc = 0;
char langTag[ULOC_FULLNAME_CAPACITY];
std::unordered_set<uint64_t> seen;
std::string locale(input.size(), 0);
while ((commaLoc = input.find_first_of(',', currentIdx)) != std::string::npos) {
locale.assign(input, currentIdx, commaLoc - currentIdx);
currentIdx = commaLoc + 1;
size_t length = toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, locale);
FontLanguage lang(langTag, length);
uint64_t identifier = lang.getIdentifier();
if (!lang.isUnsupported() && seen.count(identifier) == 0) {
result.push_back(lang);
if (result.size() == FONT_LANGUAGES_LIMIT) {
break;
}
seen.insert(identifier);
}
}
if (result.size() < FONT_LANGUAGES_LIMIT) {
locale.assign(input, currentIdx, input.size() - currentIdx);
size_t length = toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, locale);
FontLanguage lang(langTag, length);
uint64_t identifier = lang.getIdentifier();
if (!lang.isUnsupported() && seen.count(identifier) == 0) {
result.push_back(lang);
}
}
return result;
}
// static
uint32_t FontLanguageListCache::getId(const std::string& languages) {
FontLanguageListCache* inst = FontLanguageListCache::getInstance();
std::unordered_map<std::string, uint32_t>::const_iterator it =
inst->mLanguageListLookupTable.find(languages);
if (it != inst->mLanguageListLookupTable.end()) {
return it->second;
}
// Given language list is not in cache. Insert it and return newly assigned ID.
const uint32_t nextId = inst->mLanguageLists.size();
FontLanguages fontLanguages(parseLanguageList(languages));
if (fontLanguages.empty()) {
return kEmptyListId;
}
inst->mLanguageLists.push_back(std::move(fontLanguages));
inst->mLanguageListLookupTable.insert(std::make_pair(languages, nextId));
return nextId;
}
// static
const FontLanguages& FontLanguageListCache::getById(uint32_t id) {
FontLanguageListCache* inst = FontLanguageListCache::getInstance();
LOG_ALWAYS_FATAL_IF(id >= inst->mLanguageLists.size(), "Lookup by unknown language list ID.");
return inst->mLanguageLists[id];
}
// static
FontLanguageListCache* FontLanguageListCache::getInstance() {
assertMinikinLocked();
static FontLanguageListCache* instance = nullptr;
if (instance == nullptr) {
instance = new FontLanguageListCache();
// Insert an empty language list for mapping default language list to kEmptyListId.
// The default language list has only one FontLanguage and it is the unsupported language.
instance->mLanguageLists.push_back(FontLanguages());
instance->mLanguageListLookupTable.insert(std::make_pair("", kEmptyListId));
}
return instance;
}
} // namespace android
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