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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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
package com.google.devtools.build.lib.rules.config;
import static com.google.devtools.build.lib.packages.Attribute.attr;
import static com.google.devtools.build.lib.packages.BuildType.LABEL;
import static com.google.devtools.build.lib.packages.BuildType.LABEL_KEYED_STRING_DICT;
import static com.google.devtools.build.lib.packages.BuildType.LABEL_LIST;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.BaseRuleClasses;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.PrerequisiteArtifacts;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
import com.google.devtools.build.lib.analysis.config.ConfigMatchingProvider;
import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.RuleClass;
/** Rule introducing a transition to set feature flags for itself and dependencies. */
public final class FeatureFlagSetterRule implements RuleDefinition, RuleConfiguredTargetFactory {
@Override
public RuleClass build(RuleClass.Builder builder, RuleDefinitionEnvironment env) {
return builder
.requiresConfigurationFragments(ConfigFeatureFlagConfiguration.class)
.cfg(new ConfigFeatureFlagTransitionFactory("flag_values"))
.add(attr("deps", LABEL_LIST).allowedFileTypes())
.add(attr("exports_setting", LABEL).allowedRuleClasses("config_setting").allowedFileTypes())
.add(
attr("exports_flag", LABEL)
.allowedRuleClasses("config_feature_flag")
.allowedFileTypes())
.add(
attr("flag_values", LABEL_KEYED_STRING_DICT)
.allowedRuleClasses("config_feature_flag")
.allowedFileTypes()
.nonconfigurable("used in RuleTransitionFactory")
.value(ImmutableMap.<Label, String>of()))
.build();
}
@Override
public Metadata getMetadata() {
return RuleDefinition.Metadata.builder()
.name("feature_flag_setter")
.ancestors(BaseRuleClasses.BaseRule.class)
.factoryClass(FeatureFlagSetterRule.class)
.build();
}
@Override
public ConfiguredTarget create(RuleContext ruleContext)
throws InterruptedException, RuleErrorException, ActionConflictException {
TransitiveInfoCollection exportedFlag =
ruleContext.getPrerequisite("exports_flag", Mode.TARGET);
ConfigFeatureFlagProvider exportedFlagProvider =
exportedFlag != null ? ConfigFeatureFlagProvider.fromTarget(exportedFlag) : null;
TransitiveInfoCollection exportedSetting =
ruleContext.getPrerequisite("exports_setting", Mode.TARGET);
ConfigMatchingProvider exportedSettingProvider =
exportedSetting != null ? exportedSetting.getProvider(ConfigMatchingProvider.class) : null;
RuleConfiguredTargetBuilder builder =
new RuleConfiguredTargetBuilder(ruleContext)
.setFilesToBuild(PrerequisiteArtifacts.nestedSet(ruleContext, "deps", Mode.TARGET))
.addProvider(RunfilesProvider.class, RunfilesProvider.EMPTY);
if (exportedFlagProvider != null) {
builder.addNativeDeclaredProvider(exportedFlagProvider);
}
if (exportedSettingProvider != null) {
builder.addProvider(ConfigMatchingProvider.class, exportedSettingProvider);
}
return builder.build();
}
}
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