1 /*
2 * Copyright (C) 2018 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 "utils/resources.h"
18
19 #include "utils/base/logging.h"
20 #include "utils/zlib/buffer_generated.h"
21
22 namespace libtextclassifier3 {
23 namespace {
isWildcardMatch(const flatbuffers::String * left,const std::string & right)24 bool isWildcardMatch(const flatbuffers::String* left,
25 const std::string& right) {
26 return (left == nullptr || right.empty());
27 }
28
isExactMatch(const flatbuffers::String * left,const std::string & right)29 bool isExactMatch(const flatbuffers::String* left, const std::string& right) {
30 if (left == nullptr) {
31 return right.empty();
32 }
33 return left->str() == right;
34 }
35
36 } // namespace
37
LocaleMatch(const Locale & locale,const LanguageTag * entry_locale) const38 int Resources::LocaleMatch(const Locale& locale,
39 const LanguageTag* entry_locale) const {
40 int match = LOCALE_NO_MATCH;
41 if (isExactMatch(entry_locale->language(), locale.Language())) {
42 match |= LOCALE_LANGUAGE_MATCH;
43 } else if (isWildcardMatch(entry_locale->language(), locale.Language())) {
44 match |= LOCALE_LANGUAGE_WILDCARD_MATCH;
45 }
46
47 if (isExactMatch(entry_locale->script(), locale.Script())) {
48 match |= LOCALE_SCRIPT_MATCH;
49 } else if (isWildcardMatch(entry_locale->script(), locale.Script())) {
50 match |= LOCALE_SCRIPT_WILDCARD_MATCH;
51 }
52
53 if (isExactMatch(entry_locale->region(), locale.Region())) {
54 match |= LOCALE_REGION_MATCH;
55 } else if (isWildcardMatch(entry_locale->region(), locale.Region())) {
56 match |= LOCALE_REGION_WILDCARD_MATCH;
57 }
58
59 return match;
60 }
61
FindResource(const StringPiece resource_name) const62 const ResourceEntry* Resources::FindResource(
63 const StringPiece resource_name) const {
64 if (resources_ == nullptr || resources_->resource_entry() == nullptr) {
65 TC3_LOG(ERROR) << "No resources defined.";
66 return nullptr;
67 }
68 const ResourceEntry* entry =
69 resources_->resource_entry()->LookupByKey(resource_name.data());
70 if (entry == nullptr) {
71 TC3_LOG(ERROR) << "Resource " << resource_name.ToString() << " not found";
72 return nullptr;
73 }
74 return entry;
75 }
76
BestResourceForLocales(const ResourceEntry * resource,const std::vector<Locale> & locales) const77 int Resources::BestResourceForLocales(
78 const ResourceEntry* resource, const std::vector<Locale>& locales) const {
79 // Find best match based on locale.
80 int resource_id = -1;
81 int locale_match = LOCALE_NO_MATCH;
82 const auto* resources = resource->resource();
83 for (int user_locale = 0; user_locale < locales.size(); user_locale++) {
84 if (!locales[user_locale].IsValid()) {
85 continue;
86 }
87 for (int i = 0; i < resources->size(); i++) {
88 for (const int locale_id : *resources->Get(i)->locale()) {
89 const int candidate_match = LocaleMatch(
90 locales[user_locale], resources_->locale()->Get(locale_id));
91
92 // Only consider if at least the language matches.
93 if ((candidate_match & LOCALE_LANGUAGE_MATCH) == 0 &&
94 (candidate_match & LOCALE_LANGUAGE_WILDCARD_MATCH) == 0) {
95 continue;
96 }
97
98 if (candidate_match > locale_match) {
99 locale_match = candidate_match;
100 resource_id = i;
101 }
102 }
103 }
104
105 // If the language matches exactly, we are already finished.
106 // We found an exact language match.
107 if (locale_match & LOCALE_LANGUAGE_MATCH) {
108 return resource_id;
109 }
110 }
111 return resource_id;
112 }
113
GetResourceContent(const std::vector<Locale> & locales,const StringPiece resource_name,std::string * result) const114 bool Resources::GetResourceContent(const std::vector<Locale>& locales,
115 const StringPiece resource_name,
116 std::string* result) const {
117 const ResourceEntry* entry = FindResource(resource_name);
118 if (entry == nullptr || entry->resource() == nullptr) {
119 return false;
120 }
121
122 int resource_id = BestResourceForLocales(entry, locales);
123 if (resource_id < 0) {
124 return false;
125 }
126 const auto* resource = entry->resource()->Get(resource_id);
127 if (resource->content() != nullptr) {
128 *result = resource->content()->str();
129 return true;
130 }
131 return false;
132 }
133
134 } // namespace libtextclassifier3
135