001    /*
002     * Copyright 2010-2015 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.expression;
018    
019    import com.google.dart.compiler.backend.js.ast.JsExpression;
020    import com.google.dart.compiler.backend.js.ast.JsName;
021    import com.google.dart.compiler.backend.js.ast.JsNameRef;
022    import com.google.dart.compiler.backend.js.ast.JsVars;
023    import org.jetbrains.annotations.NotNull;
024    import org.jetbrains.annotations.Nullable;
025    import org.jetbrains.kotlin.descriptors.FunctionDescriptor;
026    import org.jetbrains.kotlin.descriptors.VariableDescriptor;
027    import org.jetbrains.kotlin.js.translate.callTranslator.CallTranslator;
028    import org.jetbrains.kotlin.js.translate.context.TranslationContext;
029    import org.jetbrains.kotlin.js.translate.general.AbstractTranslator;
030    import org.jetbrains.kotlin.js.translate.reference.CallExpressionTranslator;
031    import org.jetbrains.kotlin.psi.KtMultiDeclaration;
032    import org.jetbrains.kotlin.psi.KtMultiDeclarationEntry;
033    import org.jetbrains.kotlin.resolve.BindingContext;
034    import org.jetbrains.kotlin.resolve.BindingContextUtils;
035    import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall;
036    
037    import java.util.ArrayList;
038    import java.util.List;
039    
040    import static org.jetbrains.kotlin.js.translate.utils.InlineUtils.setInlineCallMetadata;
041    
042    public class MultiDeclarationTranslator extends AbstractTranslator {
043    
044        // if multiObjectName was init, initializer must be null
045        @NotNull
046        public static JsVars translate(
047                @NotNull KtMultiDeclaration multiDeclaration,
048                @NotNull JsName multiObjectName,
049                @Nullable JsExpression initializer,
050                @NotNull TranslationContext context
051        ) {
052            return new MultiDeclarationTranslator(multiDeclaration, multiObjectName, initializer, context).translate();
053        }
054    
055        @NotNull
056        private final KtMultiDeclaration multiDeclaration;
057        @NotNull
058        private final JsName multiObjectName;
059        @Nullable
060        private final JsExpression initializer;
061    
062        private MultiDeclarationTranslator(
063                @NotNull KtMultiDeclaration multiDeclaration,
064                @NotNull JsName multiObjectName,
065                @Nullable JsExpression initializer,
066                @NotNull TranslationContext context
067        ) {
068            super(context);
069            this.multiDeclaration = multiDeclaration;
070            this.multiObjectName = multiObjectName;
071            this.initializer = initializer;
072        }
073    
074        private JsVars translate() {
075            List<JsVars.JsVar> jsVars = new ArrayList<JsVars.JsVar>();
076            if (initializer != null) {
077                jsVars.add(new JsVars.JsVar(multiObjectName, initializer));
078            }
079    
080            JsNameRef multiObjNameRef = multiObjectName.makeRef();
081            for (KtMultiDeclarationEntry entry : multiDeclaration.getEntries()) {
082                ResolvedCall<FunctionDescriptor> entryInitCall =  context().bindingContext().get(BindingContext.COMPONENT_RESOLVED_CALL, entry);
083                assert entryInitCall != null : "Entry init call must be not null";
084                JsExpression entryInitializer = CallTranslator.translate(context(), entryInitCall, multiObjNameRef);
085                FunctionDescriptor candidateDescriptor = entryInitCall.getCandidateDescriptor();
086                if (CallExpressionTranslator.shouldBeInlined(candidateDescriptor)) {
087                    setInlineCallMetadata(entryInitializer, entry, entryInitCall, context());
088                }
089                VariableDescriptor descriptor = BindingContextUtils.getNotNull( context().bindingContext(), BindingContext.VARIABLE, entry);
090                JsName name =  context().getNameForDescriptor(descriptor);
091                jsVars.add(new JsVars.JsVar(name, entryInitializer));
092            }
093            return new JsVars(jsVars, true);
094        }
095    }