| /* |
| * 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 IsExpression} represent an is expression. |
| * |
| * <pre> |
| * isExpression ::= |
| * {@link Expression expression} 'is' '!'? {@link TypeName type} |
| * </pre> |
| * |
| * @coverage dart.engine.ast |
| */ |
| public class IsExpression extends Expression { |
| /** |
| * The expression used to compute the value whose type is being tested. |
| */ |
| private Expression expression; |
| |
| /** |
| * The is operator. |
| */ |
| private Token isOperator; |
| |
| /** |
| * The not operator, or {@code null} if the sense of the test is not negated. |
| */ |
| private Token notOperator; |
| |
| /** |
| * The name of the type being tested for. |
| */ |
| private TypeName type; |
| |
| /** |
| * Initialize a newly created is expression. |
| * |
| * @param expression the expression used to compute the value whose type is being tested |
| * @param isOperator the is operator |
| * @param notOperator the not operator, or {@code null} if the sense of the test is not negated |
| * @param type the name of the type being tested for |
| */ |
| public IsExpression(Expression expression, Token isOperator, Token notOperator, TypeName type) { |
| this.expression = becomeParentOf(expression); |
| this.isOperator = isOperator; |
| this.notOperator = notOperator; |
| this.type = becomeParentOf(type); |
| } |
| |
| @Override |
| public <R> R accept(AstVisitor<R> visitor) { |
| return visitor.visitIsExpression(this); |
| } |
| |
| @Override |
| public Token getBeginToken() { |
| return expression.getBeginToken(); |
| } |
| |
| @Override |
| public Token getEndToken() { |
| return type.getEndToken(); |
| } |
| |
| /** |
| * Return the expression used to compute the value whose type is being tested. |
| * |
| * @return the expression used to compute the value whose type is being tested |
| */ |
| public Expression getExpression() { |
| return expression; |
| } |
| |
| /** |
| * Return the is operator being applied. |
| * |
| * @return the is operator being applied |
| */ |
| public Token getIsOperator() { |
| return isOperator; |
| } |
| |
| /** |
| * Return the not operator being applied. |
| * |
| * @return the not operator being applied |
| */ |
| public Token getNotOperator() { |
| return notOperator; |
| } |
| |
| @Override |
| public int getPrecedence() { |
| return 7; |
| } |
| |
| /** |
| * Return the name of the type being tested for. |
| * |
| * @return the name of the type being tested for |
| */ |
| public TypeName getType() { |
| return type; |
| } |
| |
| /** |
| * Set the expression used to compute the value whose type is being tested to the given |
| * expression. |
| * |
| * @param expression the expression used to compute the value whose type is being tested |
| */ |
| public void setExpression(Expression expression) { |
| this.expression = becomeParentOf(expression); |
| } |
| |
| /** |
| * Set the is operator being applied to the given operator. |
| * |
| * @param isOperator the is operator being applied |
| */ |
| public void setIsOperator(Token isOperator) { |
| this.isOperator = isOperator; |
| } |
| |
| /** |
| * Set the not operator being applied to the given operator. |
| * |
| * @param notOperator the is operator being applied |
| */ |
| public void setNotOperator(Token notOperator) { |
| this.notOperator = notOperator; |
| } |
| |
| /** |
| * Set the name of the type being tested for to the given name. |
| * |
| * @param name the name of the type being tested for |
| */ |
| public void setType(TypeName name) { |
| this.type = becomeParentOf(name); |
| } |
| |
| @Override |
| public void visitChildren(AstVisitor<?> visitor) { |
| safelyVisitChild(expression, visitor); |
| safelyVisitChild(type, visitor); |
| } |
| } |