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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.platform;
import static com.google.devtools.build.lib.packages.Attribute.attr;
import com.google.common.collect.ImmutableList;
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.BuildType;
import com.google.devtools.build.lib.packages.RuleClass;
import com.google.devtools.build.lib.syntax.Type;
import com.google.devtools.build.lib.util.FileTypeSet;
/** Rule definition for {@link ConstraintValue}. */
public class ConstraintValueRule implements RuleDefinition {
public static final String RULE_NAME = "constraint_value";
public static final String CONSTRAINT_SETTING_ATTR = "constraint_setting";
@Override
public RuleClass build(RuleClass.Builder builder, RuleDefinitionEnvironment env) {
return builder
.override(
attr("tags", Type.STRING_LIST)
// No need to show up in ":all", etc. target patterns.
.value(ImmutableList.of("manual"))
.nonconfigurable("low-level attribute, used in platform configuration"))
/* <!-- #BLAZE_RULE(constraint_value).ATTRIBUTE(constraint) -->
The constraint_setting rule this value is applied to.
<!-- #END_BLAZE_RULE.ATTRIBUTE --> */
.add(
attr(CONSTRAINT_SETTING_ATTR, BuildType.LABEL)
.mandatory()
.allowedRuleClasses(ConstraintSettingRule.RULE_NAME)
.allowedFileTypes(FileTypeSet.NO_FILE)
.mandatoryProviders(ImmutableList.of(ConstraintSettingInfo.SKYLARK_IDENTIFIER)))
.removeAttribute("deps")
.removeAttribute("data")
.exemptFromConstraintChecking("this rule *defines* a constraint")
.build();
}
@Override
public Metadata getMetadata() {
return Metadata.builder()
.name(RULE_NAME)
.ancestors(BaseRuleClasses.RuleBase.class)
.factoryClass(ConstraintValue.class)
.build();
}
}
/*<!-- #BLAZE_RULE (NAME = constraint_value, TYPE = OTHER, FAMILY = Platform)[GENERIC_RULE] -->
<p>This rule defines a specific value of a constraint, which can be used to define execution
platforms.
<!-- #END_BLAZE_RULE -->*/
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