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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.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.List;
import java.util.Set;
/**
* A visible(x, y) query expression, which computes the subset of nodes in y
* that are visible from all nodes in x.
*
* <pre>expr ::= VISIBILE '(' expr ',' expr ')'</pre>
*
* <p>Example: return targets from the package //bar/baz that are visible to //foo.
*
* <pre>
* visible(//foo, //bar/baz:*)
* </pre>
*/
public class VisibleFunction implements QueryFunction {
@Override
public String getName() {
return "visible";
}
@Override
public int getMandatoryArguments() {
return 2;
}
@Override
public List<ArgumentType> getArgumentTypes() {
return ImmutableList.of(ArgumentType.EXPRESSION, ArgumentType.EXPRESSION);
}
@Override
public <T> void eval(
final QueryEnvironment<T> env,
VariableContext<T> context,
QueryExpression expression,
List<Argument> args,
final Callback<T> callback) throws QueryException, InterruptedException {
final Set<T> toSet = QueryUtil.evalAll(env, context, args.get(0).getExpression());
env.eval(args.get(1).getExpression(), context, new Callback<T>() {
@Override
public void process(Iterable<T> partialResult) throws QueryException, InterruptedException {
for (T t : partialResult) {
if (visibleToAll(env, toSet, t)) {
callback.process(ImmutableList.of(t));
}
}
}
});
}
/**
* Returns true if {@code target} is visible to all targets in {@code toSet}.
*/
private static <T> boolean visibleToAll(
QueryEnvironment<T> env, Set<T> toSet, T target) throws QueryException {
for (T to : toSet) {
if (!visible(env, to, target)) {
return false;
}
}
return true;
}
/**
* Returns true if the target {@code from} is visible to the target {@code to}.
*/
public static <T> boolean visible(QueryEnvironment<T> env, T to, T from) throws QueryException {
Set<QueryVisibility<T>> visiblePackages = env.getAccessor().getVisibility(from);
for (QueryVisibility<T> spec : visiblePackages) {
if (spec.contains(to)) {
return true;
}
}
return false;
}
}
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