1/* 2 * Copyright (C) 2015 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#define LOG_TAG "Minikin" 18 19#include "FontLanguageListCache.h" 20 21#include <cutils/log.h> 22#include <unicode/uloc.h> 23#include <unordered_set> 24 25#include "MinikinInternal.h" 26#include "FontLanguage.h" 27 28namespace android { 29 30const uint32_t FontLanguageListCache::kEmptyListId; 31 32// Returns the text length of output. 33static size_t toLanguageTag(char* output, size_t outSize, const std::string& locale) { 34 output[0] = '\0'; 35 if (locale.empty()) { 36 return 0; 37 } 38 39 size_t outLength = 0; 40 UErrorCode uErr = U_ZERO_ERROR; 41 outLength = uloc_canonicalize(locale.c_str(), output, outSize, &uErr); 42 if (U_FAILURE(uErr)) { 43 // unable to build a proper language identifier 44 ALOGD("uloc_canonicalize(\"%s\") failed: %s", locale.c_str(), u_errorName(uErr)); 45 output[0] = '\0'; 46 return 0; 47 } 48 49 // Preserve "und" and "und-****" since uloc_addLikelySubtags changes "und" to "en-Latn-US". 50 if (strncmp(output, "und", 3) == 0 && 51 (outLength == 3 || (outLength == 8 && output[3] == '_'))) { 52 return outLength; 53 } 54 55 char likelyChars[ULOC_FULLNAME_CAPACITY]; 56 uErr = U_ZERO_ERROR; 57 uloc_addLikelySubtags(output, likelyChars, ULOC_FULLNAME_CAPACITY, &uErr); 58 if (U_FAILURE(uErr)) { 59 // unable to build a proper language identifier 60 ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s", output, u_errorName(uErr)); 61 output[0] = '\0'; 62 return 0; 63 } 64 65 uErr = U_ZERO_ERROR; 66 outLength = uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr); 67 if (U_FAILURE(uErr)) { 68 // unable to build a proper language identifier 69 ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars, u_errorName(uErr)); 70 output[0] = '\0'; 71 return 0; 72 } 73#ifdef VERBOSE_DEBUG 74 ALOGD("ICU normalized '%s' to '%s'", locale.c_str(), output); 75#endif 76 return outLength; 77} 78 79static std::vector<FontLanguage> parseLanguageList(const std::string& input) { 80 std::vector<FontLanguage> result; 81 size_t currentIdx = 0; 82 size_t commaLoc = 0; 83 char langTag[ULOC_FULLNAME_CAPACITY]; 84 std::unordered_set<uint64_t> seen; 85 std::string locale(input.size(), 0); 86 87 while ((commaLoc = input.find_first_of(',', currentIdx)) != std::string::npos) { 88 locale.assign(input, currentIdx, commaLoc - currentIdx); 89 currentIdx = commaLoc + 1; 90 size_t length = toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, locale); 91 FontLanguage lang(langTag, length); 92 uint64_t identifier = lang.getIdentifier(); 93 if (!lang.isUnsupported() && seen.count(identifier) == 0) { 94 result.push_back(lang); 95 if (result.size() == FONT_LANGUAGES_LIMIT) { 96 break; 97 } 98 seen.insert(identifier); 99 } 100 } 101 if (result.size() < FONT_LANGUAGES_LIMIT) { 102 locale.assign(input, currentIdx, input.size() - currentIdx); 103 size_t length = toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, locale); 104 FontLanguage lang(langTag, length); 105 uint64_t identifier = lang.getIdentifier(); 106 if (!lang.isUnsupported() && seen.count(identifier) == 0) { 107 result.push_back(lang); 108 } 109 } 110 return result; 111} 112 113// static 114uint32_t FontLanguageListCache::getId(const std::string& languages) { 115 FontLanguageListCache* inst = FontLanguageListCache::getInstance(); 116 std::unordered_map<std::string, uint32_t>::const_iterator it = 117 inst->mLanguageListLookupTable.find(languages); 118 if (it != inst->mLanguageListLookupTable.end()) { 119 return it->second; 120 } 121 122 // Given language list is not in cache. Insert it and return newly assigned ID. 123 const uint32_t nextId = inst->mLanguageLists.size(); 124 FontLanguages fontLanguages(parseLanguageList(languages)); 125 if (fontLanguages.empty()) { 126 return kEmptyListId; 127 } 128 inst->mLanguageLists.push_back(std::move(fontLanguages)); 129 inst->mLanguageListLookupTable.insert(std::make_pair(languages, nextId)); 130 return nextId; 131} 132 133// static 134const FontLanguages& FontLanguageListCache::getById(uint32_t id) { 135 FontLanguageListCache* inst = FontLanguageListCache::getInstance(); 136 LOG_ALWAYS_FATAL_IF(id >= inst->mLanguageLists.size(), "Lookup by unknown language list ID."); 137 return inst->mLanguageLists[id]; 138} 139 140// static 141FontLanguageListCache* FontLanguageListCache::getInstance() { 142 assertMinikinLocked(); 143 static FontLanguageListCache* instance = nullptr; 144 if (instance == nullptr) { 145 instance = new FontLanguageListCache(); 146 147 // Insert an empty language list for mapping default language list to kEmptyListId. 148 // The default language list has only one FontLanguage and it is the unsupported language. 149 instance->mLanguageLists.push_back(FontLanguages()); 150 instance->mLanguageListLookupTable.insert(std::make_pair("", kEmptyListId)); 151 } 152 return instance; 153} 154 155} // namespace android 156