/*
* Copyright 2012, the Dart project authors.
*
* Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
*
* 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.dart.engine.ast;
import com.google.dart.engine.scanner.Token;
/**
* Instances of the class {@code ExpressionStatement} wrap an expression as a statement.
*
* <pre>
* expressionStatement ::=
* {@link Expression expression}? ';'
* </pre>
*
* @coverage dart.engine.ast
*/
public class ExpressionStatement extends Statement {
/**
* The expression that comprises the statement.
*/
private Expression expression;
/**
* The semicolon terminating the statement, or {@code null} if the expression is a function
* expression and therefore isn't followed by a semicolon.
*/
private Token semicolon;
/**
* Initialize a newly created expression statement.
*
* @param expression the expression that comprises the statement
* @param semicolon the semicolon terminating the statement
*/
public ExpressionStatement(Expression expression, Token semicolon) {
this.expression = becomeParentOf(expression);
this.semicolon = semicolon;
}
@Override
public <R> R accept(AstVisitor<R> visitor) {
return visitor.visitExpressionStatement(this);
}
@Override
public Token getBeginToken() {
return expression.getBeginToken();
}
@Override
public Token getEndToken() {
if (semicolon != null) {
return semicolon;
}
return expression.getEndToken();
}
/**
* Return the expression that comprises the statement.
*
* @return the expression that comprises the statement
*/
public Expression getExpression() {
return expression;
}
/**
* Return the semicolon terminating the statement, or {@code null} if the expression is a function
* expression and therefore isn't followed by a semicolon.
*
* @return the semicolon terminating the statement
*/
public Token getSemicolon() {
return semicolon;
}
@Override
public boolean isSynthetic() {
return expression.isSynthetic() && semicolon.isSynthetic();
}
/**
* Set the expression that comprises the statement to the given expression.
*
* @param expression the expression that comprises the statement
*/
public void setExpression(Expression expression) {
this.expression = becomeParentOf(expression);
}
/**
* Set the semicolon terminating the statement to the given token.
*
* @param semicolon the semicolon terminating the statement
*/
public void setSemicolon(Token semicolon) {
this.semicolon = semicolon;
}
@Override
public void visitChildren(AstVisitor<?> visitor) {
safelyVisitChild(expression, visitor);
}
}