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.utils;
018
019 import com.intellij.openapi.util.Condition;
020 import com.intellij.util.containers.ContainerUtil;
021 import org.jetbrains.annotations.NotNull;
022 import org.jetbrains.annotations.Nullable;
023 import org.jetbrains.jet.lang.descriptors.*;
024 import org.jetbrains.jet.lang.psi.JetExpression;
025 import org.jetbrains.jet.lang.resolve.BindingContext;
026 import org.jetbrains.jet.lang.resolve.DescriptorUtils;
027 import org.jetbrains.jet.lang.resolve.name.Name;
028 import org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverValue;
029 import org.jetbrains.jet.lang.resolve.scopes.receivers.ThisReceiver;
030 import org.jetbrains.jet.lang.types.JetType;
031 import org.jetbrains.jet.lang.types.expressions.OperatorConventions;
032 import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
033 import org.jetbrains.k2js.translate.context.TranslationContext;
034
035 import java.util.Collection;
036 import java.util.List;
037 import java.util.Set;
038
039 import static org.jetbrains.jet.lang.resolve.DescriptorUtils.*;
040 import static org.jetbrains.k2js.translate.utils.AnnotationsUtils.isNativeObject;
041
042 public final class JsDescriptorUtils {
043 // TODO: maybe we should use external annotations or something else.
044 private static final Set<String> FAKE_CLASSES = ContainerUtil.immutableSet(
045 getFqNameSafe(KotlinBuiltIns.getInstance().getAny()).asString()
046 );
047
048 private JsDescriptorUtils() {
049 }
050
051 private static int valueParametersCount(@NotNull FunctionDescriptor functionDescriptor) {
052 return functionDescriptor.getValueParameters().size();
053 }
054
055 public static boolean hasParameters(@NotNull FunctionDescriptor functionDescriptor) {
056 return (valueParametersCount(functionDescriptor) > 0);
057 }
058
059 public static boolean isCompareTo(@NotNull CallableDescriptor descriptor) {
060 return descriptor.getName().equals(OperatorConventions.COMPARE_TO);
061 }
062
063 @Nullable
064 public static ClassDescriptor findAncestorClass(@NotNull List<ClassDescriptor> superclassDescriptors) {
065 for (ClassDescriptor descriptor : superclassDescriptors) {
066 if (descriptor.getKind() == ClassKind.CLASS || descriptor.getKind() == ClassKind.ENUM_CLASS) {
067 return descriptor;
068 }
069 }
070 return null;
071 }
072
073 @Nullable
074 public static ClassDescriptor getSuperclass(@NotNull ClassDescriptor classDescriptor) {
075 return findAncestorClass(getSuperclassDescriptors(classDescriptor));
076 }
077
078 @NotNull
079 public static List<JetType> getSupertypesWithoutFakes(ClassDescriptor descriptor) {
080 Collection<JetType> supertypes = descriptor.getTypeConstructor().getSupertypes();
081 return ContainerUtil.filter(supertypes, new Condition<JetType>() {
082 @Override
083 public boolean value(JetType type) {
084 ClassDescriptor classDescriptor = getClassDescriptorForType(type);
085
086 return !FAKE_CLASSES.contains(getFqNameSafe(classDescriptor).asString()) &&
087 !(classDescriptor.getKind() == ClassKind.TRAIT && isNativeObject(classDescriptor));
088 }
089 });
090 }
091
092 @NotNull
093 public static DeclarationDescriptor getContainingDeclaration(@NotNull DeclarationDescriptor descriptor) {
094 DeclarationDescriptor containing = descriptor.getContainingDeclaration();
095 assert containing != null : "Should be called on objects that have containing declaration.";
096 return containing;
097 }
098
099 @NotNull
100 public static ReceiverParameterDescriptor getReceiverParameterForReceiver(@NotNull ReceiverValue receiverParameter) {
101 DeclarationDescriptor declarationDescriptor = getDeclarationDescriptorForReceiver(receiverParameter);
102 return getReceiverParameterForDeclaration(declarationDescriptor);
103 }
104
105 @NotNull
106 private static DeclarationDescriptor getDeclarationDescriptorForReceiver(@NotNull ReceiverValue receiverParameter) {
107 if (receiverParameter instanceof ThisReceiver) {
108 DeclarationDescriptor declarationDescriptor = ((ThisReceiver) receiverParameter).getDeclarationDescriptor();
109 return declarationDescriptor.getOriginal();
110 }
111
112 throw new UnsupportedOperationException("Unsupported receiver type: " + receiverParameter.getClass() +
113 ", receiverParameter = " + receiverParameter);
114 }
115
116 public static ReceiverParameterDescriptor getReceiverParameterForDeclaration(DeclarationDescriptor declarationDescriptor) {
117 if (declarationDescriptor instanceof ClassDescriptor) {
118 return ((ClassDescriptor) declarationDescriptor).getThisAsReceiverParameter();
119 }
120 else if (declarationDescriptor instanceof CallableMemberDescriptor) {
121 ReceiverParameterDescriptor receiverDescriptor = ((CallableMemberDescriptor) declarationDescriptor).getExtensionReceiverParameter();
122 assert receiverDescriptor != null;
123 return receiverDescriptor;
124 }
125
126 throw new UnsupportedOperationException("Unsupported declaration type: " + declarationDescriptor.getClass() +
127 ", declarationDescriptor = " + declarationDescriptor);
128 }
129
130 @Nullable
131 public static FunctionDescriptor getOverriddenDescriptor(@NotNull FunctionDescriptor functionDescriptor) {
132 Set<? extends FunctionDescriptor> overriddenDescriptors = functionDescriptor.getOverriddenDescriptors();
133 if (overriddenDescriptors.isEmpty()) {
134 return null;
135 }
136 else {
137 //TODO: for now translator can't deal with multiple inheritance good enough
138 return overriddenDescriptors.iterator().next();
139 }
140 }
141
142 private static boolean isDefaultAccessor(@Nullable PropertyAccessorDescriptor accessorDescriptor) {
143 return accessorDescriptor == null || accessorDescriptor.isDefault();
144 }
145
146 public static boolean isSimpleFinalProperty(@NotNull PropertyDescriptor propertyDescriptor) {
147 return !isExtension(propertyDescriptor) &&
148 isDefaultAccessor(propertyDescriptor.getGetter()) &&
149 isDefaultAccessor(propertyDescriptor.getSetter()) &&
150 !propertyDescriptor.getModality().isOverridable();
151 }
152
153 public static boolean isBuiltin(@NotNull DeclarationDescriptor descriptor) {
154 PackageFragmentDescriptor containingPackageFragment = DescriptorUtils.getParentOfType(descriptor, PackageFragmentDescriptor.class);
155 return containingPackageFragment == KotlinBuiltIns.getInstance().getBuiltInsPackageFragment();
156 }
157
158 @Nullable
159 public static Name getNameIfStandardType(@NotNull JetExpression expression, @NotNull TranslationContext context) {
160 JetType type = context.bindingContext().get(BindingContext.EXPRESSION_TYPE, expression);
161 return type != null ? getNameIfStandardType(type) : null;
162 }
163
164 @Nullable
165 public static Name getNameIfStandardType(@NotNull JetType type) {
166 ClassifierDescriptor descriptor = type.getConstructor().getDeclarationDescriptor();
167 if (descriptor != null && descriptor.getContainingDeclaration() == KotlinBuiltIns.getInstance().getBuiltInsPackageFragment()) {
168 return descriptor.getName();
169 }
170
171 return null;
172 }
173 }