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 org.jetbrains.kotlin.builtins.KotlinBuiltIns;
020 import org.jetbrains.kotlin.js.backend.ast.JsExpression;
021 import org.jetbrains.kotlin.js.backend.ast.JsName;
022 import org.jetbrains.kotlin.js.backend.ast.JsNameRef;
023 import org.jetbrains.kotlin.js.backend.ast.JsVars;
024 import org.jetbrains.annotations.NotNull;
025 import org.jetbrains.annotations.Nullable;
026 import org.jetbrains.kotlin.descriptors.FunctionDescriptor;
027 import org.jetbrains.kotlin.descriptors.VariableDescriptor;
028 import org.jetbrains.kotlin.js.translate.callTranslator.CallTranslator;
029 import org.jetbrains.kotlin.js.translate.context.TranslationContext;
030 import org.jetbrains.kotlin.js.translate.general.AbstractTranslator;
031 import org.jetbrains.kotlin.js.translate.reference.CallExpressionTranslator;
032 import org.jetbrains.kotlin.js.translate.utils.JsAstUtils;
033 import org.jetbrains.kotlin.psi.KtDestructuringDeclaration;
034 import org.jetbrains.kotlin.psi.KtDestructuringDeclarationEntry;
035 import org.jetbrains.kotlin.resolve.BindingContext;
036 import org.jetbrains.kotlin.resolve.BindingContextUtils;
037 import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall;
038 import org.jetbrains.kotlin.types.KotlinType;
039
040 import java.util.ArrayList;
041 import java.util.List;
042
043 import static org.jetbrains.kotlin.js.translate.context.Namer.getCapturedVarAccessor;
044 import static org.jetbrains.kotlin.js.translate.utils.InlineUtils.setInlineCallMetadata;
045 import static org.jetbrains.kotlin.resolve.BindingContextUtils.isVarCapturedInClosure;
046
047 public class DestructuringDeclarationTranslator extends AbstractTranslator {
048
049 // if multiObjectName was init, initializer must be null
050 @NotNull
051 public static JsVars translate(
052 @NotNull KtDestructuringDeclaration multiDeclaration,
053 @NotNull JsName multiObjectName,
054 @Nullable JsExpression initializer,
055 @NotNull TranslationContext context
056 ) {
057 return new DestructuringDeclarationTranslator(multiDeclaration, multiObjectName, initializer, context).translate();
058 }
059
060 @NotNull
061 private final KtDestructuringDeclaration multiDeclaration;
062 @NotNull
063 private final JsName multiObjectName;
064 @Nullable
065 private final JsExpression initializer;
066
067 private DestructuringDeclarationTranslator(
068 @NotNull KtDestructuringDeclaration multiDeclaration,
069 @NotNull JsName multiObjectName,
070 @Nullable JsExpression initializer,
071 @NotNull TranslationContext context
072 ) {
073 super(context);
074 this.multiDeclaration = multiDeclaration;
075 this.multiObjectName = multiObjectName;
076 this.initializer = initializer;
077 }
078
079 private JsVars translate() {
080 List<JsVars.JsVar> jsVars = new ArrayList<JsVars.JsVar>();
081 if (initializer != null) {
082 jsVars.add(new JsVars.JsVar(multiObjectName, initializer));
083 }
084
085 JsNameRef multiObjNameRef = multiObjectName.makeRef();
086 for (KtDestructuringDeclarationEntry entry : multiDeclaration.getEntries()) {
087 VariableDescriptor descriptor = BindingContextUtils.getNotNull( context().bindingContext(), BindingContext.VARIABLE, entry);
088 // Do not call `componentX` for destructuring entry called _
089 if (descriptor.getName().isSpecial()) continue;
090
091 ResolvedCall<FunctionDescriptor> entryInitCall = context().bindingContext().get(BindingContext.COMPONENT_RESOLVED_CALL, entry);
092 assert entryInitCall != null : "Entry init call must be not null";
093 JsExpression entryInitializer = CallTranslator.translate(context(), entryInitCall, multiObjNameRef);
094 FunctionDescriptor candidateDescriptor = entryInitCall.getCandidateDescriptor();
095 if (CallExpressionTranslator.shouldBeInlined(candidateDescriptor, context())) {
096 setInlineCallMetadata(entryInitializer, entry, entryInitCall, context());
097 }
098
099 KotlinType returnType = candidateDescriptor.getReturnType();
100 if (returnType != null && KotlinBuiltIns.isCharOrNullableChar(returnType) && !KotlinBuiltIns.isCharOrNullableChar(descriptor.getType())) {
101 entryInitializer = JsAstUtils.charToBoxedChar(entryInitializer);
102 }
103
104 JsName name = context().getNameForDescriptor(descriptor);
105 if (isVarCapturedInClosure(context().bindingContext(), descriptor)) {
106 JsNameRef alias = getCapturedVarAccessor(name.makeRef());
107 entryInitializer = JsAstUtils.wrapValue(alias, entryInitializer);
108 }
109
110 jsVars.add(new JsVars.JsVar(name, entryInitializer));
111 }
112 return new JsVars(jsVars, true);
113 }
114 }