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// Copyright 2014 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.query2.engine;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.Argument;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.ArgumentType;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryFunction;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
/**
* A label(attr_name, argument) expression, which computes the set of targets
* whose labels appear in the specified attribute of some rule in 'argument'.
*
* <pre>expr ::= LABELS '(' WORD ',' expr ')'</pre>
*
* Example:
* <pre>
* labels(srcs, //foo) The 'srcs' source files to the //foo rule.
* </pre>
*/
class LabelsFunction implements QueryFunction {
LabelsFunction() {
}
@Override
public String getName() {
return "labels";
}
@Override
public int getMandatoryArguments() {
return 2;
}
@Override
public List<ArgumentType> getArgumentTypes() {
return ImmutableList.of(ArgumentType.WORD, ArgumentType.EXPRESSION);
}
@Override
public <T> Set<T> eval(QueryEnvironment<T> env, QueryExpression expression, List<Argument> args)
throws QueryException, InterruptedException {
Set<T> inputs = args.get(1).getExpression().eval(env);
Set<T> result = new LinkedHashSet<>();
String attrName = args.get(0).getWord();
for (T input : inputs) {
if (env.getAccessor().isRule(input)) {
List<T> targets = env.getAccessor().getLabelListAttr(expression, input, attrName,
"in '" + attrName + "' of rule " + env.getAccessor().getLabel(input) + ": ");
for (T target : targets) {
result.add(env.getOrCreate(target));
}
}
}
return result;
}
}
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