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.CallableDescriptor;
024 import org.jetbrains.jet.lang.descriptors.ConstructorDescriptor;
025 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
026 import org.jetbrains.jet.lang.descriptors.PropertyDescriptor;
027 import org.jetbrains.jet.lang.psi.JetClassOrObject;
028 import org.jetbrains.jet.lang.psi.JetDelegationSpecifier;
029 import org.jetbrains.jet.lang.psi.JetDelegatorToSuperCall;
030 import org.jetbrains.jet.lang.psi.JetParameter;
031 import org.jetbrains.jet.lang.resolve.BindingContext;
032 import org.jetbrains.jet.lang.resolve.calls.model.ResolvedCall;
033 import org.jetbrains.jet.lang.types.JetType;
034 import org.jetbrains.jet.lexer.JetTokens;
035 import org.jetbrains.k2js.translate.context.Namer;
036 import org.jetbrains.k2js.translate.context.TranslationContext;
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(@NotNull JetClassOrObject classDeclaration, @NotNull TranslationContext context) {
056 // Note: it's important we use scope for class descriptor because anonymous function used in property initializers
057 // belong to the properties themselves
058 super(context.newDeclaration(getConstructor(context.bindingContext(), classDeclaration)));
059 this.classDeclaration = classDeclaration;
060 }
061
062 @NotNull
063 public JsFunction generateInitializeMethod() {
064 //TODO: it's inconsistent that we have scope for class and function for constructor, currently have problems implementing better way
065 ConstructorDescriptor primaryConstructor = getConstructor(bindingContext(), classDeclaration);
066 JsFunction result = context().getFunctionObject(primaryConstructor);
067 //NOTE: while we translate constructor parameters we also add property initializer statements
068 // for properties declared as constructor parameters
069 result.getParameters().addAll(translatePrimaryConstructorParameters());
070 mayBeAddCallToSuperMethod(result);
071 new InitializerVisitor(initializerStatements).traverseContainer(classDeclaration, context());
072
073 List<JsStatement> statements = result.getBody().getStatements();
074 statements.addAll(setDefaultValueForArguments(primaryConstructor, context()));
075 for (JsStatement statement : initializerStatements) {
076 if (statement instanceof JsBlock) {
077 statements.addAll(((JsBlock) statement).getStatements());
078 }
079 else {
080 statements.add(statement);
081 }
082 }
083
084 return result;
085 }
086
087 @NotNull
088 public JsExpression generateEnumEntryInstanceCreation(@NotNull JetType enumClassType) {
089 JetDelegatorToSuperCall superCall = getSuperCall();
090 List<JsExpression> arguments;
091 if (superCall != null) {
092 arguments = translateArguments(superCall);
093 } else {
094 arguments = Collections.emptyList();
095 }
096 JsNameRef reference = context().getQualifiedReference(getClassDescriptorForType(enumClassType));
097 return new JsNew(reference, arguments);
098 }
099
100 private void mayBeAddCallToSuperMethod(JsFunction initializer) {
101 if (classDeclaration.hasModifier(JetTokens.ENUM_KEYWORD)) {
102 addCallToSuperMethod(Collections.<JsExpression>emptyList(), initializer);
103 return;
104 }
105 if (hasAncestorClass(bindingContext(), classDeclaration)) {
106 JetDelegatorToSuperCall superCall = getSuperCall();
107 if (superCall == null) {
108 return;
109 }
110 addCallToSuperMethod(translateArguments(superCall), initializer);
111 }
112 }
113
114 private void addCallToSuperMethod(@NotNull List<JsExpression> arguments, JsFunction initializer) {
115 JsName ref = context().scope().declareName(Namer.CALLEE_NAME);
116 initializer.setName(ref);
117 JsInvocation call = new JsInvocation(Namer.getFunctionCallRef(Namer.superMethodNameRef(ref)));
118 call.getArguments().add(JsLiteral.THIS);
119 call.getArguments().addAll(arguments);
120 initializerStatements.add(0, call.makeStmt());
121 }
122
123 @NotNull
124 private List<JsExpression> translateArguments(@NotNull JetDelegatorToSuperCall superCall) {
125 ResolvedCall<? extends CallableDescriptor> call = context().bindingContext().get(BindingContext.RESOLVED_CALL, superCall.getCalleeExpression());
126 assert call != null : "ResolvedCall for superCall must be not null";
127 return CallArgumentTranslator.translate(call, null, context()).getTranslateArguments();
128 }
129
130 @Nullable
131 private JetDelegatorToSuperCall getSuperCall() {
132 JetDelegatorToSuperCall result = null;
133 for (JetDelegationSpecifier specifier : classDeclaration.getDelegationSpecifiers()) {
134 if (specifier instanceof JetDelegatorToSuperCall) {
135 result = (JetDelegatorToSuperCall) specifier;
136 }
137 }
138 return result;
139 }
140
141 @NotNull
142 List<JsParameter> translatePrimaryConstructorParameters() {
143 List<JetParameter> parameterList = getPrimaryConstructorParameters(classDeclaration);
144 List<JsParameter> result = new ArrayList<JsParameter>();
145 for (JetParameter jetParameter : parameterList) {
146 result.add(translateParameter(jetParameter));
147 }
148 return result;
149 }
150
151 @NotNull
152 private JsParameter translateParameter(@NotNull JetParameter jetParameter) {
153 DeclarationDescriptor parameterDescriptor =
154 getDescriptorForElement(bindingContext(), jetParameter);
155 JsName parameterName = context().getNameForDescriptor(parameterDescriptor);
156 JsParameter jsParameter = new JsParameter(parameterName);
157 mayBeAddInitializerStatementForProperty(jsParameter, jetParameter);
158 return jsParameter;
159 }
160
161 private void mayBeAddInitializerStatementForProperty(@NotNull JsParameter jsParameter,
162 @NotNull JetParameter jetParameter) {
163 PropertyDescriptor propertyDescriptor =
164 getPropertyDescriptorForConstructorParameter(bindingContext(), jetParameter);
165 if (propertyDescriptor == null) {
166 return;
167 }
168 JsNameRef initialValueForProperty = jsParameter.getName().makeRef();
169 addInitializerOrPropertyDefinition(initialValueForProperty, propertyDescriptor);
170 }
171
172 private void addInitializerOrPropertyDefinition(@NotNull JsNameRef initialValue, @NotNull PropertyDescriptor propertyDescriptor) {
173 initializerStatements.add(InitializerUtils.generateInitializerForProperty(context(), propertyDescriptor, initialValue));
174 }
175 }