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.initializer;
018
019 import com.google.dart.compiler.backend.js.ast.*;
020 import com.intellij.util.SmartList;
021 import org.jetbrains.annotations.NotNull;
022 import org.jetbrains.annotations.Nullable;
023 import org.jetbrains.jet.lang.descriptors.ConstructorDescriptor;
024 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
025 import org.jetbrains.jet.lang.descriptors.PropertyDescriptor;
026 import org.jetbrains.jet.lang.psi.JetClassOrObject;
027 import org.jetbrains.jet.lang.psi.JetDelegationSpecifier;
028 import org.jetbrains.jet.lang.psi.JetDelegatorToSuperCall;
029 import org.jetbrains.jet.lang.psi.JetParameter;
030 import org.jetbrains.jet.lang.resolve.calls.callUtil.CallUtilPackage;
031 import org.jetbrains.jet.lang.resolve.calls.model.ResolvedCall;
032 import org.jetbrains.jet.lang.types.JetType;
033 import org.jetbrains.jet.lexer.JetTokens;
034 import org.jetbrains.k2js.translate.context.Namer;
035 import org.jetbrains.k2js.translate.context.TranslationContext;
036 import org.jetbrains.k2js.translate.declaration.DelegationTranslator;
037 import org.jetbrains.k2js.translate.general.AbstractTranslator;
038 import org.jetbrains.k2js.translate.reference.CallArgumentTranslator;
039
040 import java.util.ArrayList;
041 import java.util.Collections;
042 import java.util.List;
043
044 import static org.jetbrains.jet.lang.resolve.DescriptorUtils.getClassDescriptorForType;
045 import static org.jetbrains.k2js.translate.utils.BindingUtils.*;
046 import static org.jetbrains.k2js.translate.utils.FunctionBodyTranslator.setDefaultValueForArguments;
047 import static org.jetbrains.k2js.translate.utils.PsiUtils.getPrimaryConstructorParameters;
048
049 public final class ClassInitializerTranslator extends AbstractTranslator {
050 @NotNull
051 private final JetClassOrObject classDeclaration;
052 @NotNull
053 private final List<JsStatement> initializerStatements = new SmartList<JsStatement>();
054
055 public ClassInitializerTranslator(
056 @NotNull JetClassOrObject classDeclaration,
057 @NotNull TranslationContext context
058 ) {
059 // Note: it's important we use scope for class descriptor because anonymous function used in property initializers
060 // belong to the properties themselves
061 super(context.newDeclaration(getConstructor(context.bindingContext(), classDeclaration), null));
062 this.classDeclaration = classDeclaration;
063 }
064
065 @NotNull
066 public JsFunction generateInitializeMethod(DelegationTranslator delegationTranslator) {
067 //TODO: it's inconsistent that we have scope for class and function for constructor, currently have problems implementing better way
068 ConstructorDescriptor primaryConstructor = getConstructor(bindingContext(), classDeclaration);
069 JsFunction result = context().getFunctionObject(primaryConstructor);
070 //NOTE: while we translate constructor parameters we also add property initializer statements
071 // for properties declared as constructor parameters
072 result.getParameters().addAll(translatePrimaryConstructorParameters());
073 mayBeAddCallToSuperMethod(result);
074 delegationTranslator.addInitCode(initializerStatements);
075 new InitializerVisitor(initializerStatements).traverseContainer(classDeclaration, context());
076
077 List<JsStatement> statements = result.getBody().getStatements();
078 statements.addAll(setDefaultValueForArguments(primaryConstructor, context()));
079 for (JsStatement statement : initializerStatements) {
080 if (statement instanceof JsBlock) {
081 statements.addAll(((JsBlock) statement).getStatements());
082 }
083 else {
084 statements.add(statement);
085 }
086 }
087
088 return result;
089 }
090
091 @NotNull
092 public JsExpression generateEnumEntryInstanceCreation(@NotNull JetType enumClassType) {
093 JetDelegatorToSuperCall superCall = getSuperCall();
094 List<JsExpression> arguments;
095 if (superCall != null) {
096 arguments = translateArguments(superCall);
097 } else {
098 arguments = Collections.emptyList();
099 }
100 JsNameRef reference = context().getQualifiedReference(getClassDescriptorForType(enumClassType));
101 return new JsNew(reference, arguments);
102 }
103
104 private void mayBeAddCallToSuperMethod(JsFunction initializer) {
105 if (classDeclaration.hasModifier(JetTokens.ENUM_KEYWORD)) {
106 addCallToSuperMethod(Collections.<JsExpression>emptyList(), initializer);
107 return;
108 }
109 if (hasAncestorClass(bindingContext(), classDeclaration)) {
110 JetDelegatorToSuperCall superCall = getSuperCall();
111 if (superCall == null) {
112 return;
113 }
114 addCallToSuperMethod(translateArguments(superCall), initializer);
115 }
116 }
117
118 private void addCallToSuperMethod(@NotNull List<JsExpression> arguments, JsFunction initializer) {
119 JsName ref = context().scope().declareName(Namer.CALLEE_NAME);
120 initializer.setName(ref);
121 JsInvocation call = new JsInvocation(Namer.getFunctionCallRef(Namer.superMethodNameRef(ref)));
122 call.getArguments().add(JsLiteral.THIS);
123 call.getArguments().addAll(arguments);
124 initializerStatements.add(0, call.makeStmt());
125 }
126
127 @NotNull
128 private List<JsExpression> translateArguments(@NotNull JetDelegatorToSuperCall superCall) {
129 ResolvedCall<?> call = CallUtilPackage.getResolvedCallWithAssert(superCall, context().bindingContext());
130 return CallArgumentTranslator.translate(call, null, context()).getTranslateArguments();
131 }
132
133 @Nullable
134 private JetDelegatorToSuperCall getSuperCall() {
135 JetDelegatorToSuperCall result = null;
136 for (JetDelegationSpecifier specifier : classDeclaration.getDelegationSpecifiers()) {
137 if (specifier instanceof JetDelegatorToSuperCall) {
138 result = (JetDelegatorToSuperCall) specifier;
139 }
140 }
141 return result;
142 }
143
144 @NotNull
145 List<JsParameter> translatePrimaryConstructorParameters() {
146 List<JetParameter> parameterList = getPrimaryConstructorParameters(classDeclaration);
147 List<JsParameter> result = new ArrayList<JsParameter>();
148 for (JetParameter jetParameter : parameterList) {
149 result.add(translateParameter(jetParameter));
150 }
151 return result;
152 }
153
154 @NotNull
155 private JsParameter translateParameter(@NotNull JetParameter jetParameter) {
156 DeclarationDescriptor parameterDescriptor =
157 getDescriptorForElement(bindingContext(), jetParameter);
158 JsName parameterName = context().getNameForDescriptor(parameterDescriptor);
159 JsParameter jsParameter = new JsParameter(parameterName);
160 mayBeAddInitializerStatementForProperty(jsParameter, jetParameter);
161 return jsParameter;
162 }
163
164 private void mayBeAddInitializerStatementForProperty(@NotNull JsParameter jsParameter,
165 @NotNull JetParameter jetParameter) {
166 PropertyDescriptor propertyDescriptor =
167 getPropertyDescriptorForConstructorParameter(bindingContext(), jetParameter);
168 if (propertyDescriptor == null) {
169 return;
170 }
171 JsNameRef initialValueForProperty = jsParameter.getName().makeRef();
172 addInitializerOrPropertyDefinition(initialValueForProperty, propertyDescriptor);
173 }
174
175 private void addInitializerOrPropertyDefinition(@NotNull JsNameRef initialValue, @NotNull PropertyDescriptor propertyDescriptor) {
176 initializerStatements.add(InitializerUtils.generateInitializerForProperty(context(), propertyDescriptor, initialValue));
177 }
178 }