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.k2js.translate.context.TranslationContext;
026 import org.jetbrains.k2js.translate.utils.ErrorReportingUtils;
027
028 import static org.jetbrains.k2js.translate.general.Translation.translateAsExpression;
029 import static org.jetbrains.k2js.translate.utils.BindingUtils.getDescriptorForReferenceExpression;
030 import static org.jetbrains.k2js.translate.utils.PsiUtils.getNotNullSimpleNameSelector;
031 import static org.jetbrains.k2js.translate.utils.PsiUtils.getSelector;
032
033 public final class QualifiedExpressionTranslator {
034
035 private QualifiedExpressionTranslator() {
036 }
037
038 @NotNull
039 public static AccessTranslator getAccessTranslator(@NotNull JetQualifiedExpression expression,
040 @NotNull TranslationContext context) {
041 JsExpression receiver = translateReceiver(expression, context);
042 return VariableAccessTranslator.newInstance(context, getNotNullSimpleNameSelector(expression), receiver);
043 }
044
045 @NotNull
046 public static JsExpression translateQualifiedExpression(@NotNull JetQualifiedExpression expression,
047 @NotNull TranslationContext context) {
048 JsExpression receiver = translateReceiver(expression, context);
049 JetExpression selector = getSelector(expression);
050 return dispatchToCorrectTranslator(receiver, selector, context);
051 }
052
053 @NotNull
054 private static JsExpression dispatchToCorrectTranslator(
055 @Nullable JsExpression receiver,
056 @NotNull JetExpression selector,
057 @NotNull TranslationContext context
058 ) {
059 if (ReferenceTranslator.canBePropertyAccess(selector, context)) {
060 assert selector instanceof JetSimpleNameExpression : "Selectors for properties must be simple names.";
061 return VariableAccessTranslator.newInstance(context, (JetSimpleNameExpression)selector, receiver).translateAsGet();
062 }
063 if (selector instanceof JetCallExpression) {
064 return invokeCallExpressionTranslator(receiver, selector, context);
065 }
066 //TODO: never get there
067 if (selector instanceof JetSimpleNameExpression) {
068 return ReferenceTranslator.translateSimpleNameWithQualifier((JetSimpleNameExpression) selector, receiver, context);
069 }
070 throw new AssertionError("Unexpected qualified expression: " + selector.getText());
071 }
072
073 @NotNull
074 private static JsExpression invokeCallExpressionTranslator(
075 @Nullable JsExpression receiver,
076 @NotNull JetExpression selector,
077 @NotNull TranslationContext context
078 ) {
079 try {
080 return CallExpressionTranslator.translate((JetCallExpression) selector, receiver, context);
081 } catch (RuntimeException e) {
082 throw ErrorReportingUtils.reportErrorWithLocation(selector, e);
083 }
084 }
085
086 @Nullable
087 private static JsExpression translateReceiver(@NotNull JetQualifiedExpression expression,
088 @NotNull TranslationContext context) {
089 JetExpression receiverExpression = expression.getReceiverExpression();
090 if (isFullQualifierForExpression(receiverExpression, context)) {
091 return null;
092 }
093 return translateAsExpression(receiverExpression, context);
094 }
095
096 //TODO: prove correctness
097 private static boolean isFullQualifierForExpression(@Nullable JetExpression receiverExpression, @NotNull TranslationContext context) {
098 if (receiverExpression == null) {
099 return false;
100 }
101 if (receiverExpression instanceof JetReferenceExpression) {
102 DeclarationDescriptor descriptorForReferenceExpression =
103 getDescriptorForReferenceExpression(context.bindingContext(), (JetReferenceExpression)receiverExpression);
104 if (descriptorForReferenceExpression instanceof PackageViewDescriptor) {
105 return true;
106 }
107 }
108 if (receiverExpression instanceof JetQualifiedExpression) {
109 return isFullQualifierForExpression(((JetQualifiedExpression)receiverExpression).getSelectorExpression(), context);
110 }
111 return false;
112 }
113 }