Add a BazelProtoLibrary representing a collection of .proto files.

--
MOS_MIGRATED_REVID=102079110

3 files changed, 142 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java b/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java
index f2e2c2b1b0..488015874c 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java
+++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRuleClassProvider.java
@@ -114,6 +114,7 @@ import com.google.devtools.build.lib.rules.objc.ObjcOptionsRule;
 import com.google.devtools.build.lib.rules.objc.ObjcProtoLibraryRule;
 import com.google.devtools.build.lib.rules.objc.ObjcRuleClasses;
 import com.google.devtools.build.lib.rules.objc.ObjcXcodeprojRule;
+import com.google.devtools.build.lib.rules.proto.BazelProtoLibraryRule;
 import com.google.devtools.build.lib.rules.python.PythonConfigurationLoader;
 import com.google.devtools.build.lib.rules.python.PythonOptions;
 import com.google.devtools.build.lib.rules.workspace.BindRule;
@@ -249,6 +250,7 @@ public class BazelRuleClassProvider {
     builder.addRuleDefinition(new BazelShLibraryRule());
     builder.addRuleDefinition(new BazelShBinaryRule());
     builder.addRuleDefinition(new BazelShTestRule());
+    builder.addRuleDefinition(new BazelProtoLibraryRule());
 
     builder.addRuleDefinition(new CcToolchainRule());
     builder.addRuleDefinition(new CcToolchainSuiteRule());
diff --git a/src/main/java/com/google/devtools/build/lib/rules/proto/BazelProtoLibrary.java b/src/main/java/com/google/devtools/build/lib/rules/proto/BazelProtoLibrary.java
new file mode 100644
index 0000000000..309f7d29fa
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/rules/proto/BazelProtoLibrary.java
@@ -0,0 +1,55 @@
+// Copyright 2015 Google Inc. 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 com.google.common.collect.ImmutableList;
+import com.google.devtools.build.lib.actions.Artifact;
+import com.google.devtools.build.lib.analysis.ConfiguredTarget;
+import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
+import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
+import com.google.devtools.build.lib.analysis.RuleContext;
+import com.google.devtools.build.lib.analysis.RunfilesProvider;
+import com.google.devtools.build.lib.collect.nestedset.NestedSet;
+import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
+
+/**
+ * An implementation for the "proto_library" rule.
+ */
+public class BazelProtoLibrary implements RuleConfiguredTargetFactory {
+
+  @Override
+  public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedException {
+    ImmutableList<Artifact> protoSources =
+        ruleContext.getPrerequisiteArtifacts("srcs", Mode.TARGET).list();
+    ImmutableList<Artifact> directProtoSources = ProtoCommon.getDirectProtoSources(
+        ruleContext, protoSources);
+    ProtoCommon.checkSourceFilesAreInSamePackage(ruleContext);
+
+    NestedSet<Artifact> transitiveImports =
+        ProtoCommon.collectTransitiveImports(ruleContext, protoSources);
+
+    RunfilesProvider runfilesProvider =
+        ProtoCommon.createRunfilesProvider(transitiveImports, ruleContext);
+    // TODO(bazel-team): this second constructor argument is superfluous and should be removed.
+    ProtoSourcesProvider sourcesProvider =
+        new ProtoSourcesProvider(transitiveImports, transitiveImports, directProtoSources);
+
+    return new RuleConfiguredTargetBuilder(ruleContext)
+        .add(RunfilesProvider.class, runfilesProvider)
+        .addProvider(ProtoSourcesProvider.class, sourcesProvider)
+        .addSkylarkTransitiveInfo(ProtoSourcesProvider.SKYLARK_NAME, sourcesProvider)
+        .build();
+  }
+}
diff --git a/src/main/java/com/google/devtools/build/lib/rules/proto/BazelProtoLibraryRule.java b/src/main/java/com/google/devtools/build/lib/rules/proto/BazelProtoLibraryRule.java
new file mode 100644
index 0000000000..b8e190c1f3
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/rules/proto/BazelProtoLibraryRule.java
@@ -0,0 +1,85 @@
+// Copyright 2015 Google Inc. 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.attr;
+import static com.google.devtools.build.lib.packages.Type.LABEL_LIST;
+
+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.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 {
+
+  @Override
+  public RuleClass build(Builder builder, final RuleDefinitionEnvironment env) {
+
+    return builder
+        .setUndocumented()
+        .setOutputToGenfiles()
+        /* <!-- #BLAZE_RULE(proto_library).ATTRIBUTE(deps) -->
+        The list of other <code>proto_library</code>
+        rules that the target depends upon.
+        ${SYNOPSIS}
+        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> files that are processed to create the target.
+        ${SYNOPSIS}
+        This is usually a non empty list. One usecase where <code>srcs</code> can be
+        empty is an <i>alias-library</i>. This is a proto_library rule having one or
+        more other proto_library in <code>deps</code>. This pattern can be used to
+        e.g. export a public api under a persistent name.
+        <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
+        .add(attr("srcs", LABEL_LIST)
+            .direct_compile_time_input()
+            .allowedFileTypes(FileType.of(".proto")))
+        .advertiseProvider(ProtoSourcesProvider.class)
+        .build();
+  }
+
+  @Override
+  public Metadata getMetadata() {
+    return RuleDefinition.Metadata.builder()
+        .name("proto_library")
+        .ancestors(BaseRuleClasses.RuleBase.class)
+        .factoryClass(BazelProtoLibrary.class)
+        .build();
+  }
+}
+
+/*<!-- #BLAZE_RULE (NAME = proto_library, TYPE = LIBRARY, FAMILY = Protocol Buffer) -->
+
+${ATTRIBUTE_SIGNATURE}
+
+<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>
+
+${ATTRIBUTE_DEFINITION}
+
+<!-- #END_BLAZE_RULE -->*/