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 com.google.dart.compiler.backend.js.ast.JsName;
021 import com.google.dart.compiler.backend.js.ast.JsNameRef;
022 import org.jetbrains.annotations.NotNull;
023 import org.jetbrains.annotations.Nullable;
024 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
025 import org.jetbrains.jet.lang.descriptors.PropertyDescriptor;
026 import org.jetbrains.k2js.translate.context.TranslationContext;
027
028 import static org.jetbrains.k2js.translate.utils.JsAstUtils.assignment;
029 import static org.jetbrains.k2js.translate.utils.JsDescriptorUtils.getExpectedThisDescriptor;
030
031 /**
032 * For native apis that use .property notation for access.
033 */
034 public final class NativePropertyAccessTranslator extends PropertyAccessTranslator {
035
036 @Nullable
037 private final JsExpression receiver;
038 @NotNull
039 private final PropertyDescriptor propertyDescriptor;
040
041 /*package*/
042 NativePropertyAccessTranslator(@NotNull PropertyDescriptor descriptor,
043 @Nullable JsExpression receiver,
044 @NotNull TranslationContext context) {
045 super(context);
046 this.receiver = receiver;
047 this.propertyDescriptor = descriptor.getOriginal();
048 }
049
050 @Override
051 @NotNull
052 public JsExpression translateAsGet() {
053 return translateAsGet(getReceiver());
054 }
055
056 @NotNull
057 @Override
058 protected JsExpression translateAsGet(@Nullable JsExpression receiver) {
059 return getCallType().constructCall(receiver, new CallType.CallConstructor() {
060 @NotNull
061 @Override
062 public JsExpression construct(@Nullable JsExpression receiver) {
063 return doTranslateAsGet(receiver);
064 }
065 }, context());
066 }
067
068 @NotNull
069 private JsExpression doTranslateAsGet(JsExpression receiver) {
070 JsName nativePropertyName = context().getNameForDescriptor(propertyDescriptor);
071 if (receiver != null) {
072 return new JsNameRef(nativePropertyName, receiver);
073 }
074 else {
075 return nativePropertyName.makeRef();
076 }
077 }
078
079 @Override
080 @NotNull
081 protected JsExpression translateAsSet(@Nullable JsExpression receiver, @NotNull final JsExpression setTo) {
082 assert receiver != null;
083 return getCallType().constructCall(receiver, new CallType.CallConstructor() {
084 @NotNull
085 @Override
086 public JsExpression construct(@Nullable JsExpression receiver) {
087 return assignment(translateAsGet(receiver), setTo);
088 }
089 }, context());
090 }
091
092 @NotNull
093 @Override
094 public JsExpression translateAsSet(@NotNull JsExpression setTo) {
095 return translateAsSet(getReceiver(), setTo);
096 }
097
098 @Nullable
099 private JsExpression getReceiver() {
100 if (receiver != null) {
101 return receiver;
102 }
103 assert propertyDescriptor.getReceiverParameter() == null : "Can't have native extension properties.";
104 DeclarationDescriptor expectedThisDescriptor = getExpectedThisDescriptor(propertyDescriptor);
105 if (expectedThisDescriptor == null) {
106 return null;
107 }
108 return context().getThisObject(expectedThisDescriptor);
109 }
110
111 @NotNull
112 @Override
113 public CachedAccessTranslator getCached() {
114 return new CachedPropertyAccessTranslator(getReceiver(), this, context());
115 }
116 }