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// Copyright 2015 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.proto;
import static com.google.devtools.build.lib.packages.Attribute.ConfigurationTransition.HOST;
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_LIST;
import static com.google.devtools.build.lib.syntax.Type.BOOLEAN;
import com.google.devtools.build.lib.analysis.BaseRuleClasses;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.Attribute;
import com.google.devtools.build.lib.packages.AttributeMap;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.RuleClass;
import com.google.devtools.build.lib.packages.RuleClass.Builder;
import com.google.devtools.build.lib.util.FileType;
/**
* Rule definition for the proto_library rule.
*/
public final class BazelProtoLibraryRule implements RuleDefinition {
private static final Attribute.LateBoundLabel<BuildConfiguration> PROTO_COMPILER =
new Attribute.LateBoundLabel<BuildConfiguration>(
"//third_party/protobuf:protoc", ProtoConfiguration.class) {
@Override
public Label resolve(Rule rule, AttributeMap attributes, BuildConfiguration configuration) {
Label label = configuration.getFragment(ProtoConfiguration.class).protoCompiler();
return label != null ? label : getDefault();
}
};
@Override
public RuleClass build(Builder builder, final RuleDefinitionEnvironment env) {
return builder
.requiresConfigurationFragments(ProtoConfiguration.class)
// This rule works, but does nothing, in open-source Bazel, due to the
// lack of protoc support. Users can theoretically write their own Skylark rules,
// but these are still 'experimental' according to the documentation.
.setUndocumented()
.setOutputToGenfiles()
.add(attr(":proto_compiler", LABEL).cfg(HOST).exec().value(PROTO_COMPILER))
/* <!-- #BLAZE_RULE(proto_library).ATTRIBUTE(deps) -->
The list of other <code>proto_library</code> rules that the target depends upon.
A <code>proto_library</code> may only depend on other
<code>proto_library</code> targets.
It may not depend on language-specific libraries.
<!-- #END_BLAZE_RULE.ATTRIBUTE --> */
.override(attr("deps", LABEL_LIST).allowedRuleClasses("proto_library").allowedFileTypes())
/* <!-- #BLAZE_RULE(proto_library).ATTRIBUTE(srcs) -->
The list of <code>.proto</code> and <code>.protodevel</code> files that are
processed to create the target. This is usually a non empty list. One usecase
where <code>srcs</code> can be empty is an <i>alias-library</i>. This is a
proto_library rule having one or more other proto_library in <code>deps</code>.
This pattern can be used to e.g. export a public api under a persistent name.
<!-- #END_BLAZE_RULE.ATTRIBUTE --> */
.add(
attr("srcs", LABEL_LIST)
.direct_compile_time_input()
.allowedFileTypes(FileType.of(".proto"), FileType.of(".protodevel")))
.add(attr("strict_proto_deps", BOOLEAN).value(true).undocumented("for migration only"))
.advertiseProvider(ProtoSourcesProvider.class)
.build();
}
@Override
public Metadata getMetadata() {
return RuleDefinition.Metadata.builder()
.name("proto_library")
.ancestors(BaseRuleClasses.RuleBase.class)
.factoryClass(BazelProtoLibrary.class)
.build();
}
}
/*<!-- #BLAZE_RULE (NAME = proto_library, TYPE = LIBRARY, FAMILY = Protocol Buffer) -->
<p>Use <code>proto_library</code> to define libraries of protocol buffers
which may be used from multiple languages. A <code>proto_library</code> may be listed
in the <code>deps</code> clause of supported rules, such as <code>objc_proto_library</code>.
</p>
<!-- #END_BLAZE_RULE -->*/
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