001 /*
002 * Copyright 2010-2013 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.k2js.translate.reference;
018
019 import com.google.dart.compiler.backend.js.ast.JsExpression;
020 import org.jetbrains.annotations.NotNull;
021 import org.jetbrains.annotations.Nullable;
022 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
023 import org.jetbrains.jet.lang.descriptors.PackageViewDescriptor;
024 import org.jetbrains.jet.lang.psi.*;
025 import org.jetbrains.jet.lang.resolve.bindingContextUtil.BindingContextUtilPackage;
026 import org.jetbrains.k2js.translate.context.TemporaryVariable;
027 import org.jetbrains.k2js.translate.context.TranslationContext;
028 import org.jetbrains.k2js.translate.utils.ErrorReportingUtils;
029 import org.jetbrains.k2js.translate.utils.JsAstUtils;
030
031 import static org.jetbrains.k2js.translate.general.Translation.translateAsExpression;
032 import static org.jetbrains.k2js.translate.reference.CallExpressionTranslator.shouldBeInlined;
033 import static org.jetbrains.k2js.translate.utils.BindingUtils.getDescriptorForReferenceExpression;
034 import static org.jetbrains.k2js.translate.utils.PsiUtils.getNotNullSimpleNameSelector;
035 import static org.jetbrains.k2js.translate.utils.PsiUtils.getSelector;
036
037 public final class QualifiedExpressionTranslator {
038
039 private QualifiedExpressionTranslator() {
040 }
041
042 @NotNull
043 public static AccessTranslator getAccessTranslator(@NotNull JetQualifiedExpression expression,
044 @NotNull TranslationContext context, boolean forceOrderOfEvaluation) {
045 JsExpression receiver = translateReceiver(expression, context);
046 if (forceOrderOfEvaluation && receiver != null) {
047 TemporaryVariable temporaryVariable = context.declareTemporary(null);
048 context.addStatementToCurrentBlock(JsAstUtils.assignment(temporaryVariable.reference(), receiver).makeStmt());
049 receiver = temporaryVariable.reference();
050 }
051 return VariableAccessTranslator.newInstance(context, getNotNullSimpleNameSelector(expression), receiver);
052 }
053
054 @NotNull
055 public static JsExpression translateQualifiedExpression(@NotNull JetQualifiedExpression expression,
056 @NotNull TranslationContext context) {
057 JsExpression receiver = translateReceiver(expression, context);
058 JetExpression selector = getSelector(expression);
059 return dispatchToCorrectTranslator(receiver, selector, context);
060 }
061
062 @NotNull
063 private static JsExpression dispatchToCorrectTranslator(
064 @Nullable JsExpression receiver,
065 @NotNull JetExpression selector,
066 @NotNull TranslationContext context
067 ) {
068 if (ReferenceTranslator.canBePropertyAccess(selector, context)) {
069 assert selector instanceof JetSimpleNameExpression : "Selectors for properties must be simple names.";
070 return VariableAccessTranslator.newInstance(context, (JetSimpleNameExpression)selector, receiver).translateAsGet();
071 }
072 if (selector instanceof JetCallExpression) {
073 if (shouldBeInlined((JetCallExpression) selector, context) &&
074 BindingContextUtilPackage.isUsedAsExpression(selector, context.bindingContext())) {
075 TemporaryVariable temporaryVariable = context.declareTemporary(null);
076 JsExpression result = invokeCallExpressionTranslator(receiver, selector, context);
077 context.addStatementToCurrentBlock(JsAstUtils.assignment(temporaryVariable.reference(), result).makeStmt());
078 return temporaryVariable.reference();
079 } else {
080 return invokeCallExpressionTranslator(receiver, selector, context);
081 }
082 }
083 //TODO: never get there
084 if (selector instanceof JetSimpleNameExpression) {
085 return ReferenceTranslator.translateSimpleNameWithQualifier((JetSimpleNameExpression) selector, receiver, context);
086 }
087 throw new AssertionError("Unexpected qualified expression: " + selector.getText());
088 }
089
090 @NotNull
091 private static JsExpression invokeCallExpressionTranslator(
092 @Nullable JsExpression receiver,
093 @NotNull JetExpression selector,
094 @NotNull TranslationContext context
095 ) {
096 try {
097 return CallExpressionTranslator.translate((JetCallExpression) selector, receiver, context);
098 } catch (RuntimeException e) {
099 throw ErrorReportingUtils.reportErrorWithLocation(selector, e);
100 }
101 }
102
103 @Nullable
104 private static JsExpression translateReceiver(@NotNull JetQualifiedExpression expression,
105 @NotNull TranslationContext context) {
106 JetExpression receiverExpression = expression.getReceiverExpression();
107 if (isFullQualifierForExpression(receiverExpression, context)) {
108 return null;
109 }
110 return translateAsExpression(receiverExpression, context);
111 }
112
113 //TODO: prove correctness
114 private static boolean isFullQualifierForExpression(@Nullable JetExpression receiverExpression, @NotNull TranslationContext context) {
115 if (receiverExpression == null) {
116 return false;
117 }
118 if (receiverExpression instanceof JetReferenceExpression) {
119 DeclarationDescriptor descriptorForReferenceExpression =
120 getDescriptorForReferenceExpression(context.bindingContext(), (JetReferenceExpression)receiverExpression);
121 if (descriptorForReferenceExpression instanceof PackageViewDescriptor) {
122 return true;
123 }
124 }
125 if (receiverExpression instanceof JetQualifiedExpression) {
126 return isFullQualifierForExpression(((JetQualifiedExpression)receiverExpression).getSelectorExpression(), context);
127 }
128 return false;
129 }
130 }