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 "LocaleListCache.h"
20
21 #include <unordered_set>
22
23 #include <log/log.h>
24 #include <unicode/uloc.h>
25
26 #include "Locale.h"
27 #include "MinikinInternal.h"
28
29 namespace minikin {
30
31 const uint32_t LocaleListCache::kEmptyListId;
32
33 // Returns the text length of output.
toLanguageTag(char * output,size_t outSize,const StringPiece & locale)34 static size_t toLanguageTag(char* output, size_t outSize, const StringPiece& locale) {
35 output[0] = '\0';
36 if (locale.empty()) {
37 return 0;
38 }
39
40 std::string localeString = locale.toString(); // ICU only understands C-style string.
41
42 size_t outLength = 0;
43 UErrorCode uErr = U_ZERO_ERROR;
44 outLength = uloc_canonicalize(localeString.c_str(), output, outSize, &uErr);
45 if (U_FAILURE(uErr)) {
46 // unable to build a proper locale identifier
47 ALOGD("uloc_canonicalize(\"%s\") failed: %s", localeString.c_str(), u_errorName(uErr));
48 output[0] = '\0';
49 return 0;
50 }
51
52 // Preserve "und" and "und-****" since uloc_addLikelySubtags changes "und" to "en-Latn-US".
53 if (strncmp(output, "und", 3) == 0 &&
54 (outLength == 3 || (outLength == 8 && output[3] == '_'))) {
55 output[3] = '-'; // to be language tag.
56 return outLength;
57 }
58
59 char likelyChars[ULOC_FULLNAME_CAPACITY];
60 uErr = U_ZERO_ERROR;
61 uloc_addLikelySubtags(output, likelyChars, ULOC_FULLNAME_CAPACITY, &uErr);
62 if (U_FAILURE(uErr)) {
63 // unable to build a proper locale identifier
64 ALOGD("uloc_addLikelySubtags(\"%s\") failed: %s", output, u_errorName(uErr));
65 output[0] = '\0';
66 return 0;
67 }
68
69 uErr = U_ZERO_ERROR;
70 outLength = uloc_toLanguageTag(likelyChars, output, outSize, FALSE, &uErr);
71 if (U_FAILURE(uErr)) {
72 // unable to build a proper locale identifier
73 ALOGD("uloc_toLanguageTag(\"%s\") failed: %s", likelyChars, u_errorName(uErr));
74 output[0] = '\0';
75 return 0;
76 }
77 return outLength;
78 }
79
parseLocaleList(const std::string & input)80 static std::vector<Locale> parseLocaleList(const std::string& input) {
81 std::vector<Locale> result;
82 char langTag[ULOC_FULLNAME_CAPACITY];
83 std::unordered_set<uint64_t> seen;
84
85 SplitIterator it(input, ',');
86 while (it.hasNext()) {
87 StringPiece localeStr = it.next();
88 size_t length = toLanguageTag(langTag, ULOC_FULLNAME_CAPACITY, localeStr);
89 Locale locale(StringPiece(langTag, length));
90 if (locale.isUnsupported()) {
91 continue;
92 }
93 const bool isNewLocale = seen.insert(locale.getIdentifier()).second;
94 if (!isNewLocale) {
95 continue;
96 }
97
98 result.push_back(locale);
99 if (result.size() >= FONT_LOCALE_LIMIT) {
100 break;
101 }
102 }
103 return result;
104 }
105
LocaleListCache()106 LocaleListCache::LocaleListCache() {
107 // Insert an empty locale list for mapping default locale list to kEmptyListId.
108 // The default locale list has only one Locale and it is the unsupported locale.
109 mLocaleLists.emplace_back();
110 mLocaleListLookupTable.insert(std::make_pair("", kEmptyListId));
111 }
112
getIdInternal(const std::string & locales)113 uint32_t LocaleListCache::getIdInternal(const std::string& locales) {
114 std::lock_guard<std::mutex> lock(mMutex);
115 const auto& it = mLocaleListLookupTable.find(locales);
116 if (it != mLocaleListLookupTable.end()) {
117 return it->second;
118 }
119
120 // Given locale list is not in cache. Insert it and return newly assigned ID.
121 const uint32_t nextId = mLocaleLists.size();
122 LocaleList fontLocales(parseLocaleList(locales));
123 if (fontLocales.empty()) {
124 return kEmptyListId;
125 }
126 mLocaleLists.push_back(std::move(fontLocales));
127 mLocaleListLookupTable.insert(std::make_pair(locales, nextId));
128 return nextId;
129 }
130
getByIdInternal(uint32_t id)131 const LocaleList& LocaleListCache::getByIdInternal(uint32_t id) {
132 std::lock_guard<std::mutex> lock(mMutex);
133 MINIKIN_ASSERT(id < mLocaleLists.size(), "Lookup by unknown locale list ID.");
134 return mLocaleLists[id];
135 }
136
137 } // namespace minikin
138