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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.analysis.util;
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_LIST;
import static com.google.devtools.build.lib.packages.BuildType.NODEP_LABEL_LIST;
import static com.google.devtools.build.lib.syntax.Type.BOOLEAN;
import static com.google.devtools.build.lib.syntax.Type.STRING;
import static com.google.devtools.build.lib.syntax.Type.STRING_LIST;
import com.google.devtools.build.lib.analysis.BaseRuleClasses;
import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
import com.google.devtools.build.lib.packages.Attribute;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.RuleClass;
import com.google.devtools.build.lib.util.FileTypeSet;
import java.util.Arrays;
import java.util.List;
/**
* Provides a simple API for creating custom rule classes for tests.
*
* <p>Usage:
*
* <pre>
* MockRule fooRule = () -> MockRule.define("foo_rule");
* MockRule ruleWithCustomAttr = () -> MockRule.define("attr_rule", attr("myattr", Type.STRING));
* </pre>
*
* <p>If you need special behavior beyond custom attributes:
*
* <pre>
* class MyCustomRuleClass implements MockRule {
* @Override
* public MockRule.State define() {
* return MockRule.define("my_custom_rule");
* }
*
* @Override
* public void customize(RuleClass.Builder builder, RuleDefinitionEnvironment environment) {
* builder.depsCfg(HostTransition.INSTANCE);
* }
* }
* </pre>
*
* <p>We use lambdas for custom rule classes because {@link ConfiguredRuleClassProvider} indexes
* rule class definitions by their Java class names. So each definition has to have its own
* unique Java class.
*/
public interface MockRule extends RuleDefinition {
/**
* Container for the desired name and custom attributes for this rule class.
*/
class State {
private final String name;
private final List<Attribute.Builder<?>> attributes;
State(String ruleClassName, Attribute.Builder<?>... attributes) {
this.name = ruleClassName;
this.attributes = Arrays.asList(attributes);
}
}
/**
* Returns a new {@link State} for this rule class. This is a convenience method for lambda
* definitions:
*
* <pre>
* MockRule myRule = () -> MockRule.define("my_rule", attr("myattr", Type.STRING));
* </pre>
*/
static State define(String ruleClassName, Attribute.Builder<?>... attributes) {
return new State(ruleClassName, attributes);
}
/**
* Returns the basic state that defines this rule class. This is the only interface method
* implementers must override.
*/
State define();
/**
* Allows for custom builder configuration beyond setting attributes.
*/
default void customize(RuleClass.Builder builder, RuleDefinitionEnvironment environment) {
}
/**
* Default <code>"deps"</code> attribute for rule classes that don't need special behavior.
*/
Attribute.Builder<?> DEPS_ATTRIBUTE = attr("deps", BuildType.LABEL_LIST).allowedFileTypes();
/**
* Builds out this rule with default attributes Blaze expects of all rules plus the custom
* attributes defined by this implementation's {@link State}.
*
* <p>Do not override this method. For extra custom behavior, override {@link #customize}.
*/
@Override
default RuleClass build(RuleClass.Builder builder, RuleDefinitionEnvironment environment) {
builder
.add(attr("testonly", BOOLEAN).nonconfigurable("test").value(false))
.add(attr("deprecation", STRING).nonconfigurable("test").value((String) null))
.add(attr("tags", STRING_LIST))
.add(attr("visibility", NODEP_LABEL_LIST).orderIndependent().cfg(HOST)
.nonconfigurable("test"))
.add(attr(RuleClass.COMPATIBLE_ENVIRONMENT_ATTR, LABEL_LIST)
.allowedFileTypes(FileTypeSet.NO_FILE))
.add(attr(RuleClass.RESTRICTED_ENVIRONMENT_ATTR, LABEL_LIST)
.allowedFileTypes(FileTypeSet.NO_FILE));
for (Attribute.Builder<?> customAttribute : define().attributes) {
builder.add(customAttribute);
}
customize(builder, environment);
return builder.build();
}
/**
* Sets this rule class's metadata with the name defined by {@link State}.
*/
@Override
default RuleDefinition.Metadata getMetadata() {
return RuleDefinition.Metadata.builder()
.name(define().name)
.type(RuleClass.Builder.RuleClassType.NORMAL)
.factoryClass(MockConfiguredTargetFactory.class)
.ancestors(BaseRuleClasses.RootRule.class)
.build();
}
}
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