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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.query2.engine;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.primitives.Booleans;
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;
/**
* An implementation of {@link QueryExpressionVisitor} which recursively visits all nested {@link
* QueryExpression}s.
*/
public abstract class AggregatingQueryExpressionVisitor<T, C>
implements QueryExpressionVisitor<T, C> {
@Override
public T visit(BinaryOperatorExpression binaryOperatorExpression, C context) {
ImmutableMap.Builder<QueryExpression, T> builder = ImmutableMap.builder();
for (QueryExpression expr : binaryOperatorExpression.getOperands()) {
builder.put(expr, expr.accept(this, context));
}
return aggregate(builder.build());
}
@Override
public T visit(FunctionExpression functionExpression, C context) {
ImmutableMap.Builder<QueryExpression, T> builder = ImmutableMap.builder();
for (Argument argument : functionExpression.getArgs()) {
if (argument.getType() == ArgumentType.EXPRESSION) {
builder.put(argument.getExpression(), argument.getExpression().accept(this, context));
}
}
return aggregate(builder.build());
}
@Override
public T visit(LetExpression letExpression, C context) {
return aggregate(
ImmutableMap.of(
letExpression.getVarExpr(), letExpression.getVarExpr().accept(this, context),
letExpression.getBodyExpr(), letExpression.getBodyExpr().accept(this, context)));
}
@Override
public T visit(SetExpression setExpression, C context) {
ImmutableMap.Builder<QueryExpression, T> builder = ImmutableMap.builder();
for (TargetLiteral targetLiteral : setExpression.getWords()) {
builder.put(targetLiteral, targetLiteral.accept(this, context));
}
return aggregate(builder.build());
}
/**
* Aggregates results from all sub-expression visitations. The map is guaranteed to include
* results for all direct sub-expressions.
*/
protected abstract T aggregate(ImmutableMap<QueryExpression, T> resultMap);
/**
* Returns {@code true} when the query expression contains at least one {@link QueryFunction}
* whose name is in the set of {@code functionName}.
*/
public static class ContainsFunctionQueryExpressionVisitor
extends AggregatingQueryExpressionVisitor<Boolean, Void>
implements QueryExpressionVisitor<Boolean, Void> {
private final ImmutableSet<String> functionNames;
public ContainsFunctionQueryExpressionVisitor(Iterable<String> functionNames) {
this.functionNames = ImmutableSet.copyOf(functionNames);
}
@Override
public Boolean visit(TargetLiteral targetLiteral, Void context) {
return false;
}
@Override
public Boolean visit(SetExpression setExpression, Void context) {
return false;
}
@Override
public Boolean visit(FunctionExpression functionExpression, Void context) {
QueryFunction function = functionExpression.getFunction();
if (functionNames.contains(function.getName())) {
return true;
} else {
return super.visit(functionExpression, context);
}
}
@Override
protected Boolean aggregate(ImmutableMap<QueryExpression, Boolean> resultMap) {
return Booleans.contains(Booleans.toArray(resultMap.values()), true);
}
}
}
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