Option to exclude configs from AAPT2 Link
Adds --exclude-configs to remove matching configs from resulting APK. This matches on explicitness, so if the resource contains all the flags set by the option exactly, it will be removed, but not the other way around.
"--exclude-configs fr" with fr-land resource will remove.
"--exclude-configs fr-land" with fr resource will not remove.
Bug: 119678846
Test: aapt2_tests ResourceExcluder_test
Test: manually ran link on a test set of res
Change-Id: Ieccdecde4aea1fa0502abfd092dffa7da8f929ea
diff --git a/tools/aapt2/link/ResourceExcluder.cpp b/tools/aapt2/link/ResourceExcluder.cpp
new file mode 100644
index 0000000..2555995
--- /dev/null
+++ b/tools/aapt2/link/ResourceExcluder.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#include "link/ResourceExcluder.h"
+
+#include <algorithm>
+
+#include "DominatorTree.h"
+#include "ResourceTable.h"
+
+using android::ConfigDescription;
+
+namespace aapt {
+
+namespace {
+
+void RemoveIfExcluded(std::set<std::pair<ConfigDescription, int>>& excluded_configs_,
+ IAaptContext* context,
+ ResourceEntry* entry,
+ ResourceConfigValue* value) {
+ const ConfigDescription& config = value->config;
+
+ // If this entry is a default, ignore
+ if (config == ConfigDescription::DefaultConfig()) {
+ return;
+ }
+
+ for (auto& excluded_pair : excluded_configs_) {
+
+ const ConfigDescription& excluded_config = excluded_pair.first;
+ const int& excluded_diff = excluded_pair.second;
+
+ // Check whether config contains all flags in excluded config
+ int node_diff = config.diff(excluded_config);
+ int masked_diff = excluded_diff & node_diff;
+
+ if (masked_diff == 0) {
+ if (context->IsVerbose()) {
+ context->GetDiagnostics()->Note(
+ DiagMessage(value->value->GetSource())
+ << "excluded resource \""
+ << entry->name
+ << "\" with config "
+ << config.toString());
+ }
+ value->value = {};
+ return;
+ }
+ }
+}
+
+} // namespace
+
+bool ResourceExcluder::Consume(IAaptContext* context, ResourceTable* table) {
+ for (auto& package : table->packages) {
+ for (auto& type : package->types) {
+ for (auto& entry : type->entries) {
+ for (auto& value : entry->values) {
+ RemoveIfExcluded(excluded_configs_, context, entry.get(), value.get());
+ }
+
+ // Erase the values that were removed.
+ entry->values.erase(
+ std::remove_if(
+ entry->values.begin(), entry->values.end(),
+ [](const std::unique_ptr<ResourceConfigValue>& val) -> bool {
+ return val == nullptr || val->value == nullptr;
+ }),
+ entry->values.end());
+ }
+ }
+ }
+ return true;
+}
+
+} // namespace aapt