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.reference;
018
019 import com.google.dart.compiler.backend.js.ast.JsExpression;
020 import com.google.dart.compiler.backend.js.ast.JsNode;
021 import org.jetbrains.annotations.NotNull;
022 import org.jetbrains.annotations.Nullable;
023 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
024 import org.jetbrains.kotlin.descriptors.PackageViewDescriptor;
025 import org.jetbrains.kotlin.js.translate.context.TranslationContext;
026 import org.jetbrains.kotlin.js.translate.utils.ErrorReportingUtils;
027 import org.jetbrains.kotlin.psi.*;
028 import org.jetbrains.kotlin.resolve.calls.callUtil.CallUtilKt;
029 import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall;
030
031 import static org.jetbrains.kotlin.js.translate.general.Translation.translateAsExpression;
032 import static org.jetbrains.kotlin.js.translate.utils.BindingUtils.getDescriptorForReferenceExpression;
033 import static org.jetbrains.kotlin.js.translate.utils.PsiUtils.getNotNullSimpleNameSelector;
034 import static org.jetbrains.kotlin.js.translate.utils.PsiUtils.getSelector;
035
036 public final class QualifiedExpressionTranslator {
037
038 private QualifiedExpressionTranslator() {
039 }
040
041 @NotNull
042 public static AccessTranslator getAccessTranslator(@NotNull KtQualifiedExpression expression,
043 @NotNull TranslationContext context, boolean forceOrderOfEvaluation) {
044 JsExpression receiver = translateReceiver(expression, context);
045 if (forceOrderOfEvaluation && receiver != null) {
046 receiver = context.defineTemporary(receiver);
047 }
048 return VariableAccessTranslator.newInstance(context, getNotNullSimpleNameSelector(expression), receiver);
049 }
050
051 @NotNull
052 public static JsNode translateQualifiedExpression(
053 @NotNull KtQualifiedExpression expression,
054 @NotNull TranslationContext context
055 ) {
056 ResolvedCall<?> call = CallUtilKt.getResolvedCall(expression, context.bindingContext());
057 JsExpression receiver = null;
058 if (call != null) {
059 receiver = translateReceiver(expression, context);
060 }
061 KtExpression selector = getSelector(expression);
062 return dispatchToCorrectTranslator(receiver, selector, context);
063 }
064
065 @NotNull
066 private static JsNode dispatchToCorrectTranslator(
067 @Nullable JsExpression receiver,
068 @NotNull KtExpression selector,
069 @NotNull TranslationContext context
070 ) {
071 if (ReferenceTranslator.canBePropertyAccess(selector, context)) {
072 assert selector instanceof KtSimpleNameExpression : "Selectors for properties must be simple names.";
073 return VariableAccessTranslator.newInstance(context, (KtSimpleNameExpression)selector, receiver).translateAsGet();
074 }
075 if (selector instanceof KtCallExpression) {
076 return invokeCallExpressionTranslator(receiver, selector, context);
077 }
078 //TODO: never get there
079 if (selector instanceof KtSimpleNameExpression) {
080 return ReferenceTranslator.translateSimpleName((KtSimpleNameExpression) selector, context);
081 }
082 throw new AssertionError("Unexpected qualified expression: " + selector.getText());
083 }
084
085 @NotNull
086 private static JsNode invokeCallExpressionTranslator(
087 @Nullable JsExpression receiver,
088 @NotNull KtExpression selector,
089 @NotNull TranslationContext context
090 ) {
091 try {
092 return CallExpressionTranslator.translate((KtCallExpression) selector, receiver, context);
093 } catch (RuntimeException e) {
094 throw ErrorReportingUtils.reportErrorWithLocation(selector, e);
095 }
096 }
097
098 @Nullable
099 private static JsExpression translateReceiver(@NotNull KtQualifiedExpression expression,
100 @NotNull TranslationContext context) {
101 KtExpression receiverExpression = expression.getReceiverExpression();
102 if (isFullQualifierForExpression(receiverExpression, context)) {
103 return null;
104 }
105 return translateAsExpression(receiverExpression, context);
106 }
107
108 //TODO: prove correctness
109 private static boolean isFullQualifierForExpression(@Nullable KtExpression receiverExpression, @NotNull TranslationContext context) {
110 if (receiverExpression == null) {
111 return false;
112 }
113 if (receiverExpression instanceof KtReferenceExpression) {
114 DeclarationDescriptor descriptorForReferenceExpression =
115 getDescriptorForReferenceExpression(context.bindingContext(), (KtReferenceExpression)receiverExpression);
116 if (descriptorForReferenceExpression instanceof PackageViewDescriptor) {
117 return true;
118 }
119 }
120 if (receiverExpression instanceof KtQualifiedExpression) {
121 return isFullQualifierForExpression(((KtQualifiedExpression)receiverExpression).getSelectorExpression(), context);
122 }
123 return false;
124 }
125 }