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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;
/**
* Base class for all statements nodes in the AST.
*/
public abstract class Statement extends ASTNode {
/**
* Kind of the statement. This is similar to using instanceof, except that it's more efficient and
* can be used in a switch/case.
*/
public enum Kind {
ASSIGNMENT,
AUGMENTED_ASSIGNMENT,
CONDITIONAL,
EXPRESSION,
FLOW,
FOR,
FUNCTION_DEF,
IF,
LOAD,
RETURN,
}
/**
* Executes the statement in the specified build environment, which may be modified.
*
* @throws EvalException if execution of the statement could not be completed.
* @throws InterruptedException may be thrown in a sub class.
*/
@Deprecated // use Eval class instead
final void exec(Environment env) throws EvalException, InterruptedException {
try {
doExec(env);
} catch (EvalException ex) {
throw maybeTransformException(ex);
}
}
/**
* Executes the statement.
*
* <p>This method is only invoked by the super class {@link Statement} when calling {@link
* #exec(Environment)}.
*
* @throws EvalException if execution of the statement could not be completed.
* @throws InterruptedException may be thrown in a sub class.
*/
@Deprecated
final void doExec(Environment env) throws EvalException, InterruptedException {
new Eval(env).exec(this);
}
/**
* Kind of the statement. This is similar to using instanceof, except that it's more efficient and
* can be used in a switch/case.
*/
public abstract Kind kind();
}