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/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.resolve.calls.smartcasts;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import kotlin.collections.CollectionsKt;
import kotlin.jvm.functions.Function1;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
import org.jetbrains.kotlin.psi.KtExpression;
import org.jetbrains.kotlin.resolve.BindingContext;
import org.jetbrains.kotlin.resolve.BindingTrace;
import org.jetbrains.kotlin.resolve.calls.ArgumentTypeResolver;
import org.jetbrains.kotlin.resolve.calls.context.ResolutionContext;
import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue;
import org.jetbrains.kotlin.types.KotlinType;
import org.jetbrains.kotlin.types.TypeIntersector;
import org.jetbrains.kotlin.types.TypeUtils;
import org.jetbrains.kotlin.types.checker.KotlinTypeChecker;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import static org.jetbrains.kotlin.diagnostics.Errors.SMARTCAST_IMPOSSIBLE;
import static org.jetbrains.kotlin.resolve.BindingContext.IMPLICIT_RECEIVER_SMARTCAST;
import static org.jetbrains.kotlin.resolve.BindingContext.SMARTCAST;
// We do not want to make methods static to keep SmartCastManager as a component
@SuppressWarnings("MethodMayBeStatic")
public class SmartCastManager {
@NotNull
public List getSmartCastVariants(
@NotNull ReceiverValue receiverToCast,
@NotNull ResolutionContext context
) {
return getSmartCastVariants(receiverToCast, context.trace.getBindingContext(), context.scope.getOwnerDescriptor(), context.dataFlowInfo);
}
@NotNull
public List getSmartCastVariants(
@NotNull ReceiverValue receiverToCast,
@NotNull BindingContext bindingContext,
@NotNull DeclarationDescriptor containingDeclarationOrModule,
@NotNull DataFlowInfo dataFlowInfo
) {
List variants = Lists.newArrayList();
variants.add(receiverToCast.getType());
variants.addAll(getSmartCastVariantsExcludingReceiver(bindingContext, containingDeclarationOrModule, dataFlowInfo, receiverToCast));
return variants;
}
@NotNull
public List getSmartCastVariantsWithLessSpecificExcluded(
@NotNull ReceiverValue receiverToCast,
@NotNull BindingContext bindingContext,
@NotNull DeclarationDescriptor containingDeclarationOrModule,
@NotNull DataFlowInfo dataFlowInfo
) {
final List variants = CollectionsKt.distinct(
getSmartCastVariants(receiverToCast, bindingContext, containingDeclarationOrModule, dataFlowInfo));
return CollectionsKt.filter(variants, new Function1() {
@Override
public Boolean invoke(final KotlinType type) {
return CollectionsKt.none(variants, new Function1() {
@Override
public Boolean invoke(KotlinType another) {
return another != type && KotlinTypeChecker.DEFAULT.isSubtypeOf(another, type);
}
});
}
});
}
/**
* @return variants @param receiverToCast may be cast to according to context dataFlowInfo, receiverToCast itself is NOT included
*/
@NotNull
public Collection getSmartCastVariantsExcludingReceiver(
@NotNull ResolutionContext context,
@NotNull ReceiverValue receiverToCast
) {
return getSmartCastVariantsExcludingReceiver(context.trace.getBindingContext(),
context.scope.getOwnerDescriptor(),
context.dataFlowInfo,
receiverToCast);
}
/**
* @return variants @param receiverToCast may be cast to according to @param dataFlowInfo, @param receiverToCast itself is NOT included
*/
@NotNull
public Collection getSmartCastVariantsExcludingReceiver(
@NotNull BindingContext bindingContext,
@NotNull DeclarationDescriptor containingDeclarationOrModule,
@NotNull DataFlowInfo dataFlowInfo,
@NotNull ReceiverValue receiverToCast
) {
DataFlowValue dataFlowValue = DataFlowValueFactory.createDataFlowValue(
receiverToCast, bindingContext, containingDeclarationOrModule
);
return dataFlowInfo.getCollectedTypes(dataFlowValue);
}
public boolean isSubTypeBySmartCastIgnoringNullability(
@NotNull ReceiverValue receiverArgument,
@NotNull KotlinType receiverParameterType,
@NotNull ResolutionContext context
) {
List smartCastTypes = getSmartCastVariants(receiverArgument, context);
return getSmartCastSubType(TypeUtils.makeNullable(receiverParameterType), smartCastTypes) != null;
}
@Nullable
private KotlinType getSmartCastSubType(
@NotNull KotlinType receiverParameterType,
@NotNull Collection smartCastTypes
) {
Set subTypes = Sets.newHashSet();
for (KotlinType smartCastType : smartCastTypes) {
if (ArgumentTypeResolver.isSubtypeOfForArgumentType(smartCastType, receiverParameterType)) {
subTypes.add(smartCastType);
}
}
if (subTypes.isEmpty()) return null;
KotlinType intersection = TypeIntersector.intersectTypes(KotlinTypeChecker.DEFAULT, subTypes);
if (intersection == null || !intersection.getConstructor().isDenotable()) {
return receiverParameterType;
}
return intersection;
}
private static void recordCastOrError(
@NotNull KtExpression expression,
@NotNull KotlinType type,
@NotNull BindingTrace trace,
@NotNull DataFlowValue dataFlowValue,
boolean recordExpressionType
) {
if (KotlinBuiltIns.isNullableNothing(type)) return;
if (dataFlowValue.isPredictable()) {
trace.record(SMARTCAST, expression, type);
if (recordExpressionType) {
//TODO
//Why the expression type is rewritten for receivers and is not rewritten for arguments? Is it necessary?
trace.recordType(expression, type);
}
}
else {
trace.report(SMARTCAST_IMPOSSIBLE.on(expression, type, expression.getText(), dataFlowValue.getKind().getDescription()));
}
}
@Nullable
public static SmartCastResult checkAndRecordPossibleCast(
@NotNull DataFlowValue dataFlowValue,
@NotNull KotlinType expectedType,
@Nullable KtExpression expression,
@NotNull ResolutionContext c,
@Nullable KtExpression calleeExpression,
boolean recordExpressionType
) {
for (KotlinType possibleType : c.dataFlowInfo.getCollectedTypes(dataFlowValue)) {
if (ArgumentTypeResolver.isSubtypeOfForArgumentType(possibleType, expectedType)) {
if (expression != null) {
recordCastOrError(expression, possibleType, c.trace, dataFlowValue, recordExpressionType);
}
else if (calleeExpression != null && dataFlowValue.isPredictable()) {
c.trace.record(IMPLICIT_RECEIVER_SMARTCAST, calleeExpression, possibleType);
}
return new SmartCastResult(possibleType, dataFlowValue.isPredictable());
}
}
if (!c.dataFlowInfo.getCollectedNullability(dataFlowValue).canBeNull() && !expectedType.isMarkedNullable()) {
// Handling cases like:
// fun bar(x: Any) {}
// fun foo(x: T) {
// if (x != null) {
// bar(x) // Should be allowed with smart cast
// }
// }
//
// It doesn't handled by lower code with getPossibleTypes because smart cast of T after `x != null` is still has same type T.
// But at the same time we're sure that `x` can't be null and just check for such cases manually
// E.g. in case x!! when x has type of T where T is type parameter with nullable upper bounds
// x!! is immanently not null (see DataFlowValueFactory.createDataFlowValue for expression)
boolean immanentlyNotNull = !dataFlowValue.getImmanentNullability().canBeNull();
KotlinType nullableExpectedType = TypeUtils.makeNullable(expectedType);
if (ArgumentTypeResolver.isSubtypeOfForArgumentType(dataFlowValue.getType(), nullableExpectedType)) {
if (!immanentlyNotNull) {
if (expression != null) {
recordCastOrError(expression, dataFlowValue.getType(), c.trace, dataFlowValue, recordExpressionType);
}
}
return new SmartCastResult(dataFlowValue.getType(), immanentlyNotNull || dataFlowValue.isPredictable());
}
return checkAndRecordPossibleCast(dataFlowValue, nullableExpectedType, expression, c, calleeExpression, recordExpressionType);
}
return null;
}
}
