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.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.TemporaryVariable;
026 import org.jetbrains.kotlin.js.translate.context.TranslationContext;
027 import org.jetbrains.kotlin.js.translate.utils.ErrorReportingUtils;
028 import org.jetbrains.kotlin.js.translate.utils.JsAstUtils;
029 import org.jetbrains.kotlin.psi.*;
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 TemporaryVariable temporaryVariable = context.declareTemporary(null);
047 context.addStatementToCurrentBlock(JsAstUtils.assignment(temporaryVariable.reference(), receiver).makeStmt());
048 receiver = temporaryVariable.reference();
049 }
050 return VariableAccessTranslator.newInstance(context, getNotNullSimpleNameSelector(expression), receiver);
051 }
052
053 @NotNull
054 public static JsNode translateQualifiedExpression(
055 @NotNull KtQualifiedExpression expression,
056 @NotNull TranslationContext context
057 ) {
058 JsExpression receiver = translateReceiver(expression, context);
059 KtExpression selector = getSelector(expression);
060 return dispatchToCorrectTranslator(receiver, selector, context);
061 }
062
063 @NotNull
064 private static JsNode dispatchToCorrectTranslator(
065 @Nullable JsExpression receiver,
066 @NotNull KtExpression selector,
067 @NotNull TranslationContext context
068 ) {
069 if (ReferenceTranslator.canBePropertyAccess(selector, context)) {
070 assert selector instanceof KtSimpleNameExpression : "Selectors for properties must be simple names.";
071 return VariableAccessTranslator.newInstance(context, (KtSimpleNameExpression)selector, receiver).translateAsGet();
072 }
073 if (selector instanceof KtCallExpression) {
074 return invokeCallExpressionTranslator(receiver, selector, context);
075 }
076 //TODO: never get there
077 if (selector instanceof KtSimpleNameExpression) {
078 return ReferenceTranslator.translateSimpleNameWithQualifier((KtSimpleNameExpression) selector, receiver, context);
079 }
080 throw new AssertionError("Unexpected qualified expression: " + selector.getText());
081 }
082
083 @NotNull
084 private static JsNode invokeCallExpressionTranslator(
085 @Nullable JsExpression receiver,
086 @NotNull KtExpression selector,
087 @NotNull TranslationContext context
088 ) {
089 try {
090 return CallExpressionTranslator.translate((KtCallExpression) selector, receiver, context);
091 } catch (RuntimeException e) {
092 throw ErrorReportingUtils.reportErrorWithLocation(selector, e);
093 }
094 }
095
096 @Nullable
097 private static JsExpression translateReceiver(@NotNull KtQualifiedExpression expression,
098 @NotNull TranslationContext context) {
099 KtExpression receiverExpression = expression.getReceiverExpression();
100 if (isFullQualifierForExpression(receiverExpression, context)) {
101 return null;
102 }
103 return translateAsExpression(receiverExpression, context);
104 }
105
106 //TODO: prove correctness
107 private static boolean isFullQualifierForExpression(@Nullable KtExpression receiverExpression, @NotNull TranslationContext context) {
108 if (receiverExpression == null) {
109 return false;
110 }
111 if (receiverExpression instanceof KtReferenceExpression) {
112 DeclarationDescriptor descriptorForReferenceExpression =
113 getDescriptorForReferenceExpression(context.bindingContext(), (KtReferenceExpression)receiverExpression);
114 if (descriptorForReferenceExpression instanceof PackageViewDescriptor) {
115 return true;
116 }
117 }
118 if (receiverExpression instanceof KtQualifiedExpression) {
119 return isFullQualifierForExpression(((KtQualifiedExpression)receiverExpression).getSelectorExpression(), context);
120 }
121 return false;
122 }
123 }