| /* |
| * Copyright (c) 2013, 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.internal.hint; |
| |
| import com.google.dart.engine.ast.IsExpression; |
| import com.google.dart.engine.ast.TypeName; |
| import com.google.dart.engine.ast.visitor.RecursiveAstVisitor; |
| import com.google.dart.engine.element.Element; |
| import com.google.dart.engine.element.LibraryElement; |
| import com.google.dart.engine.error.HintCode; |
| import com.google.dart.engine.internal.error.ErrorReporter; |
| import com.google.dart.engine.type.Type; |
| |
| /** |
| * Instances of the class {@code Dart2JSVerifier} traverse an AST structure looking for hints for |
| * code that will be compiled to JS, such as {@link HintCode#IS_DOUBLE}. |
| * |
| * @coverage dart.engine.resolver |
| */ |
| public class Dart2JSVerifier extends RecursiveAstVisitor<Void> { |
| |
| /** |
| * The error reporter by which errors will be reported. |
| */ |
| private ErrorReporter errorReporter; |
| |
| /** |
| * The name of the {@code double} type. |
| */ |
| private static final String DOUBLE_TYPE_NAME = "double"; |
| |
| /** |
| * Create a new instance of the {@link Dart2JSVerifier}. |
| * |
| * @param errorReporter the error reporter |
| */ |
| public Dart2JSVerifier(ErrorReporter errorReporter) { |
| this.errorReporter = errorReporter; |
| } |
| |
| @Override |
| public Void visitIsExpression(IsExpression node) { |
| checkForIsDoubleHints(node); |
| return super.visitIsExpression(node); |
| } |
| |
| /** |
| * Check for instances of {@code x is double}, {@code x is int}, {@code x is! double} and |
| * {@code x is! int}. |
| * |
| * @param node the is expression to check |
| * @return {@code true} if and only if a hint code is generated on the passed node |
| * @see HintCode#IS_DOUBLE |
| * @see HintCode#IS_INT |
| * @see HintCode#IS_NOT_DOUBLE |
| * @see HintCode#IS_NOT_INT |
| */ |
| private boolean checkForIsDoubleHints(IsExpression node) { |
| TypeName typeName = node.getType(); |
| Type type = typeName.getType(); |
| if (type != null && type.getElement() != null) { |
| Element element = type.getElement(); |
| String typeNameStr = element.getName(); |
| LibraryElement libraryElement = element.getLibrary(); |
| // if (typeNameStr.equals(INT_TYPE_NAME) && libraryElement != null |
| // && libraryElement.isDartCore()) { |
| // if (node.getNotOperator() == null) { |
| // errorReporter.reportError(HintCode.IS_INT, node); |
| // } else { |
| // errorReporter.reportError(HintCode.IS_NOT_INT, node); |
| // } |
| // return true; |
| // } else |
| if (typeNameStr.equals(DOUBLE_TYPE_NAME) && libraryElement != null |
| && libraryElement.isDartCore()) { |
| if (node.getNotOperator() == null) { |
| errorReporter.reportErrorForNode(HintCode.IS_DOUBLE, node); |
| } else { |
| errorReporter.reportErrorForNode(HintCode.IS_NOT_DOUBLE, node); |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| } |