001    /*
002     * Copyright 2010-2016 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.kotlin.js.translate.initializer;
018    
019    import com.google.dart.compiler.backend.js.ast.JsStatement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.kotlin.js.translate.context.TranslationContext;
022    import org.jetbrains.kotlin.js.translate.general.Translation;
023    import org.jetbrains.kotlin.js.translate.general.TranslatorVisitor;
024    import org.jetbrains.kotlin.js.translate.utils.JsAstUtils;
025    import org.jetbrains.kotlin.psi.*;
026    
027    import java.util.List;
028    
029    import static org.jetbrains.kotlin.js.translate.general.Translation.translateAsStatementAndMergeInBlockIfNeeded;
030    import static org.jetbrains.kotlin.js.translate.initializer.InitializerUtils.generateInitializerForDelegate;
031    import static org.jetbrains.kotlin.js.translate.initializer.InitializerUtils.generateInitializerForProperty;
032    import static org.jetbrains.kotlin.js.translate.utils.BindingUtils.getPropertyDescriptor;
033    
034    public final class InitializerVisitor extends TranslatorVisitor<Void> {
035        private final List<JsStatement> result;
036    
037        public InitializerVisitor(List<JsStatement> result) {
038            this.result = result;
039        }
040    
041        @Override
042        protected Void emptyResult(@NotNull TranslationContext context) {
043            return null;
044        }
045    
046        @Override
047        public final Void visitProperty(@NotNull KtProperty property, @NotNull TranslationContext context) {
048            KtExpression initializer = property.getInitializer();
049            if (initializer != null) {
050                JsStatement statement = generateInitializerForProperty(context, getPropertyDescriptor(context.bindingContext(), property),
051                                                                       Translation.translateAsExpression(initializer, context));
052                if (!JsAstUtils.isEmptyStatement(statement)) {
053                    result.add(statement);
054                }
055            }
056    
057            JsStatement delegate = generateInitializerForDelegate(context, property);
058            if (delegate != null) result.add(delegate);
059    
060            return null;
061        }
062    
063        @Override
064        public Void visitAnonymousInitializer(@NotNull KtAnonymousInitializer initializer, @NotNull TranslationContext context) {
065            KtExpression initializerBody = initializer.getBody();
066            if (initializerBody != null) {
067                result.add(translateAsStatementAndMergeInBlockIfNeeded(initializerBody, context));
068            }
069            return null;
070        }
071    
072        @Override
073        // Not interested in other types of declarations, they do not contain initializers.
074        public Void visitDeclaration(@NotNull KtDeclaration expression, @NotNull TranslationContext context) {
075            return null;
076        }
077    
078        @Override
079        public Void visitSecondaryConstructor(@NotNull KtSecondaryConstructor constructor, TranslationContext data) {
080            return null;
081        }
082    }