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// Copyright 2014 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.syntax;
import com.google.devtools.build.lib.events.Location;
import java.io.IOException;
import javax.annotation.Nullable;
/** A wrapper Statement class for return expressions. */
public final class ReturnStatement extends Statement {
/**
* Exception sent by the return statement, to be caught by the function body.
*/
public static class ReturnException extends EvalException {
private final Object value;
public ReturnException(Location location, Object value) {
super(
location,
"return statements must be inside a function",
/*dueToIncompleteAST=*/false,
/*fillInJavaStackTrace=*/false);
this.value = value;
}
public Object getValue() {
return value;
}
@Override
public boolean canBeAddedToStackTrace() {
return false;
}
}
@Nullable private final Expression returnExpression;
public ReturnStatement(@Nullable Expression returnExpression) {
this.returnExpression = returnExpression;
}
@Nullable
public Expression getReturnExpression() {
return returnExpression;
}
@Override
public void prettyPrint(Appendable buffer, int indentLevel) throws IOException {
printIndent(buffer, indentLevel);
buffer.append("return");
if (returnExpression != null) {
buffer.append(' ');
returnExpression.prettyPrint(buffer, indentLevel);
}
buffer.append('\n');
}
@Override
public void accept(SyntaxTreeVisitor visitor) {
visitor.visit(this);
}
@Override
public Kind kind() {
return Kind.RETURN;
}
}
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