| /* |
| * Copyright (c) 2014, 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 AwaitExpression} implement an await expression. |
| */ |
| public class AwaitExpression extends Expression { |
| /** |
| * The 'await' keyword. |
| */ |
| private Token awaitKeyword; |
| |
| /** |
| * The expression whose value is being waited on. |
| */ |
| private Expression expression; |
| |
| /** |
| * Initialize a newly created await expression. |
| * |
| * @param awaitKeyword the 'await' keyword |
| * @param expression the expression whose value is being waited on |
| */ |
| public AwaitExpression(Token awaitKeyword, Expression expression) { |
| this.awaitKeyword = awaitKeyword; |
| this.expression = becomeParentOf(expression); |
| } |
| |
| @Override |
| public <R> R accept(AstVisitor<R> visitor) { |
| return visitor.visitAwaitExpression(this); |
| } |
| |
| /** |
| * Return the 'await' keyword. |
| * |
| * @return the 'await' keyword |
| */ |
| public Token getAwaitKeyword() { |
| return awaitKeyword; |
| } |
| |
| @Override |
| public Token getBeginToken() { |
| if (awaitKeyword != null) { |
| return awaitKeyword; |
| } |
| return expression.getBeginToken(); |
| } |
| |
| @Override |
| public Token getEndToken() { |
| return expression.getEndToken(); |
| } |
| |
| /** |
| * Return the expression whose value is being waited on. |
| * |
| * @return the expression whose value is being waited on |
| */ |
| public Expression getExpression() { |
| return expression; |
| } |
| |
| @Override |
| public int getPrecedence() { |
| // TODO Auto-generated method stub |
| return 0; |
| } |
| |
| /** |
| * Set the 'await' keyword to the given token. |
| * |
| * @param awaitKeyword the 'await' keyword |
| */ |
| public void setAwaitKeyword(Token awaitKeyword) { |
| this.awaitKeyword = awaitKeyword; |
| } |
| |
| /** |
| * Set the expression whose value is being waited on to the given expression. |
| * |
| * @param expression the expression whose value is being waited on |
| */ |
| public void setExpression(Expression expression) { |
| this.expression = becomeParentOf(expression); |
| } |
| |
| @Override |
| public void visitChildren(AstVisitor<?> visitor) { |
| safelyVisitChild(expression, visitor); |
| } |
| } |