/*
* 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.errorprone.refaster;
import com.google.common.base.Function;
import com.sun.source.tree.StatementTree;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.util.List;
/**
* A {@code UStatement} that matches exactly one statement, and inlines to exactly one statement.
*
* @author lowasser@google.com (Louis Wasserman)
*/
abstract class USimpleStatement extends UTree<JCStatement> implements UStatement {
@Override
public List<JCStatement> inlineStatements(Inliner inliner) throws CouldNotResolveImportException {
return List.of(inline(inliner));
}
private static Function<Unifier, UnifierWithUnconsumedStatements> withUnconsumed(
final java.util.List<? extends StatementTree> statements) {
return new Function<Unifier, UnifierWithUnconsumedStatements>() {
@Override
public UnifierWithUnconsumedStatements apply(Unifier unifier) {
return UnifierWithUnconsumedStatements.create(unifier, statements);
}
};
}
@Override
public Choice<UnifierWithUnconsumedStatements> apply(UnifierWithUnconsumedStatements state) {
java.util.List<? extends StatementTree> unconsumedStatements = state.unconsumedStatements();
if (unconsumedStatements.isEmpty()) {
return Choice.none();
}
java.util.List<? extends StatementTree> remainingStatements =
unconsumedStatements.subList(1, unconsumedStatements.size());
return unify(unconsumedStatements.get(0), state.unifier())
.transform(withUnconsumed(remainingStatements));
}
}