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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "HyphenatorMap.h"
     18 
     19 #include "LocaleListCache.h"
     20 #include "MinikinInternal.h"
     21 
     22 namespace minikin {
     23 
     24 namespace {
     25 constexpr SubtagBits LANGUAGE = SubtagBits::LANGUAGE;
     26 constexpr SubtagBits SCRIPT = SubtagBits::SCRIPT;
     27 constexpr SubtagBits REGION = SubtagBits::REGION;
     28 constexpr SubtagBits VARIANT = SubtagBits::VARIANT;
     29 
     30 constexpr int DEFAULT_MIN_PREFIX = 2;
     31 constexpr int DEFAULT_MAX_PREFIX = 2;
     32 }  // namespace
     33 
     34 // Following two function's implementations are here since Hyphenator.cpp can't include
     35 // HyphenatorMap.h due to harfbuzz dependency on the host binary.
     36 void addHyphenator(const std::string& localeStr, const Hyphenator* hyphenator) {
     37     HyphenatorMap::add(localeStr, hyphenator);
     38 }
     39 
     40 void addHyphenatorAlias(const std::string& fromLocaleStr, const std::string& toLocaleStr) {
     41     HyphenatorMap::addAlias(fromLocaleStr, toLocaleStr);
     42 }
     43 
     44 HyphenatorMap::HyphenatorMap()
     45         : mSoftHyphenOnlyHyphenator(
     46                   Hyphenator::loadBinary(nullptr, DEFAULT_MIN_PREFIX, DEFAULT_MAX_PREFIX, "")) {}
     47 
     48 void HyphenatorMap::addInternal(const std::string& localeStr, const Hyphenator* hyphenator) {
     49     const Locale locale(localeStr);
     50     std::lock_guard<std::mutex> lock(mMutex);
     51     // Overwrite even if there is already a fallback entry.
     52     mMap[locale.getIdentifier()] = hyphenator;
     53 }
     54 
     55 void HyphenatorMap::clearInternal() {
     56     std::lock_guard<std::mutex> lock(mMutex);
     57     mMap.clear();
     58 }
     59 void HyphenatorMap::addAliasInternal(const std::string& fromLocaleStr,
     60                                      const std::string& toLocaleStr) {
     61     const Locale fromLocale(fromLocaleStr);
     62     const Locale toLocale(toLocaleStr);
     63     std::lock_guard<std::mutex> lock(mMutex);
     64     auto it = mMap.find(toLocale.getIdentifier());
     65     if (it == mMap.end()) {
     66         ALOGE("Target Hyphenator not found.");
     67         return;
     68     }
     69     // Overwrite even if there is already a fallback entry.
     70     mMap[fromLocale.getIdentifier()] = it->second;
     71 }
     72 
     73 const Hyphenator* HyphenatorMap::lookupInternal(const Locale& locale) {
     74     const uint64_t id = locale.getIdentifier();
     75     std::lock_guard<std::mutex> lock(mMutex);
     76     const Hyphenator* result = lookupByIdentifier(id);
     77     if (result != nullptr) {
     78         return result;  // Found with exact match.
     79     }
     80 
     81     // First, try with dropping emoji extensions.
     82     result = lookupBySubtag(locale, LANGUAGE | REGION | SCRIPT | VARIANT);
     83     if (result != nullptr) {
     84         goto insert_result_and_return;
     85     }
     86     // If not found, try with dropping script.
     87     result = lookupBySubtag(locale, LANGUAGE | REGION | VARIANT);
     88     if (result != nullptr) {
     89         goto insert_result_and_return;
     90     }
     91     // If not found, try with dropping script and region code.
     92     result = lookupBySubtag(locale, LANGUAGE | VARIANT);
     93     if (result != nullptr) {
     94         goto insert_result_and_return;
     95     }
     96     // If not found, try only with language code.
     97     result = lookupBySubtag(locale, LANGUAGE);
     98     if (result != nullptr) {
     99         goto insert_result_and_return;
    100     }
    101     // Still not found, try only with script.
    102     result = lookupBySubtag(locale, SCRIPT);
    103     if (result != nullptr) {
    104         goto insert_result_and_return;
    105     }
    106 
    107     // If not found, use soft hyphen only hyphenator.
    108     result = mSoftHyphenOnlyHyphenator;
    109 
    110 insert_result_and_return:
    111     mMap.insert(std::make_pair(id, result));
    112     return result;
    113 }
    114 
    115 const Hyphenator* HyphenatorMap::lookupByIdentifier(uint64_t id) const {
    116     auto it = mMap.find(id);
    117     return it == mMap.end() ? nullptr : it->second;
    118 }
    119 
    120 const Hyphenator* HyphenatorMap::lookupBySubtag(const Locale& locale, SubtagBits bits) const {
    121     const Locale partialLocale = locale.getPartialLocale(bits);
    122     if (!partialLocale.isSupported() || partialLocale == locale) {
    123         return nullptr;  // Skip the partial locale result in the same locale or not supported.
    124     }
    125     return lookupByIdentifier(partialLocale.getIdentifier());
    126 }
    127 
    128 }  // namespace minikin
    129