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.utils.BindingUtils.getDescriptorForReferenceExpression;
033 import static org.jetbrains.k2js.translate.utils.PsiUtils.getNotNullSimpleNameSelector;
034 import static org.jetbrains.k2js.translate.utils.PsiUtils.getSelector;
035
036 public final class QualifiedExpressionTranslator {
037
038 private QualifiedExpressionTranslator() {
039 }
040
041 @NotNull
042 public static AccessTranslator getAccessTranslator(@NotNull JetQualifiedExpression 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 JsExpression translateQualifiedExpression(@NotNull JetQualifiedExpression expression,
055 @NotNull TranslationContext context) {
056 JsExpression receiver = translateReceiver(expression, context);
057 JetExpression selector = getSelector(expression);
058 return dispatchToCorrectTranslator(receiver, selector, context);
059 }
060
061 @NotNull
062 private static JsExpression dispatchToCorrectTranslator(
063 @Nullable JsExpression receiver,
064 @NotNull JetExpression selector,
065 @NotNull TranslationContext context
066 ) {
067 if (ReferenceTranslator.canBePropertyAccess(selector, context)) {
068 assert selector instanceof JetSimpleNameExpression : "Selectors for properties must be simple names.";
069 return VariableAccessTranslator.newInstance(context, (JetSimpleNameExpression)selector, receiver).translateAsGet();
070 }
071 if (selector instanceof JetCallExpression) {
072 if (InlinedCallExpressionTranslator.shouldBeInlined((JetCallExpression) selector, context) &&
073 BindingContextUtilPackage.isUsedAsExpression(selector, context.bindingContext())) {
074 TemporaryVariable temporaryVariable = context.declareTemporary(null);
075 JsExpression result = invokeCallExpressionTranslator(receiver, selector, context);
076 context.addStatementToCurrentBlock(JsAstUtils.assignment(temporaryVariable.reference(), result).makeStmt());
077 return temporaryVariable.reference();
078 } else {
079 return invokeCallExpressionTranslator(receiver, selector, context);
080 }
081 }
082 //TODO: never get there
083 if (selector instanceof JetSimpleNameExpression) {
084 return ReferenceTranslator.translateSimpleNameWithQualifier((JetSimpleNameExpression) selector, receiver, context);
085 }
086 throw new AssertionError("Unexpected qualified expression: " + selector.getText());
087 }
088
089 @NotNull
090 private static JsExpression invokeCallExpressionTranslator(
091 @Nullable JsExpression receiver,
092 @NotNull JetExpression selector,
093 @NotNull TranslationContext context
094 ) {
095 try {
096 return CallExpressionTranslator.translate((JetCallExpression) selector, receiver, context);
097 } catch (RuntimeException e) {
098 throw ErrorReportingUtils.reportErrorWithLocation(selector, e);
099 }
100 }
101
102 @Nullable
103 private static JsExpression translateReceiver(@NotNull JetQualifiedExpression expression,
104 @NotNull TranslationContext context) {
105 JetExpression receiverExpression = expression.getReceiverExpression();
106 if (isFullQualifierForExpression(receiverExpression, context)) {
107 return null;
108 }
109 return translateAsExpression(receiverExpression, context);
110 }
111
112 //TODO: prove correctness
113 private static boolean isFullQualifierForExpression(@Nullable JetExpression receiverExpression, @NotNull TranslationContext context) {
114 if (receiverExpression == null) {
115 return false;
116 }
117 if (receiverExpression instanceof JetReferenceExpression) {
118 DeclarationDescriptor descriptorForReferenceExpression =
119 getDescriptorForReferenceExpression(context.bindingContext(), (JetReferenceExpression)receiverExpression);
120 if (descriptorForReferenceExpression instanceof PackageViewDescriptor) {
121 return true;
122 }
123 }
124 if (receiverExpression instanceof JetQualifiedExpression) {
125 return isFullQualifierForExpression(((JetQualifiedExpression)receiverExpression).getSelectorExpression(), context);
126 }
127 return false;
128 }
129 }