blob: 5c7a513054672706a0288cc42cf2840b43de5102 [file] [log] [blame]
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/dart/element/element.dart';
import 'package:analyzer/dart/element/scope.dart';
import 'package:analyzer/dart/element/type.dart';
import 'package:analyzer/src/dart/ast/ast.dart';
import 'package:analyzer/src/dart/ast/ast_factory.dart';
import 'package:analyzer/src/dart/ast/extensions.dart';
import 'package:analyzer/src/dart/ast/utilities.dart';
import 'package:analyzer/src/dart/element/element.dart';
import 'package:analyzer/src/dart/element/inheritance_manager3.dart';
import 'package:analyzer/src/dart/element/type.dart';
import 'package:analyzer/src/dart/element/type_system.dart';
import 'package:analyzer/src/dart/resolver/extension_member_resolver.dart';
import 'package:analyzer/src/dart/resolver/invocation_inference_helper.dart';
import 'package:analyzer/src/error/codes.dart';
import 'package:analyzer/src/generated/migratable_ast_info_provider.dart';
import 'package:analyzer/src/generated/resolver.dart';
import 'package:analyzer/src/generated/super_context.dart';
import 'package:analyzer/src/generated/variable_type_provider.dart';
class MethodInvocationResolver {
/// Resolver visitor is separated from the elements resolver, which calls
/// this method resolver. If we rewrite a [MethodInvocation] node, we put
/// the resulting [FunctionExpressionInvocation] into the original node
/// under this key.
static const _rewriteResultKey = 'methodInvocationRewriteResult';
/// The resolver driving this participant.
final ResolverVisitor _resolver;
/// The type representing the type 'dynamic'.
final DynamicTypeImpl _dynamicType = DynamicTypeImpl.instance;
/// The type representing the type 'type'.
final InterfaceType _typeType;
/// The manager for the inheritance mappings.
final InheritanceManager3 _inheritance;
/// The element for the library containing the compilation unit being visited.
final LibraryElementImpl _definingLibrary;
/// The URI of [_definingLibrary].
final Uri _definingLibraryUri;
/// The object providing promoted or declared types of variables.
final LocalVariableTypeProvider _localVariableTypeProvider;
/// Helper for extension method resolution.
final ExtensionMemberResolver _extensionResolver;
final InvocationInferenceHelper _inferenceHelper;
final MigratableAstInfoProvider _migratableAstInfoProvider;
/// The invocation being resolved.
MethodInvocationImpl? _invocation;
/// The [Name] object of the invocation being resolved by [resolve].
Name? _currentName;
MethodInvocationResolver(
this._resolver,
this._migratableAstInfoProvider, {
required InvocationInferenceHelper inferenceHelper,
}) : _typeType = _resolver.typeProvider.typeType,
_inheritance = _resolver.inheritance,
_definingLibrary = _resolver.definingLibrary,
_definingLibraryUri = _resolver.definingLibrary.source.uri,
_localVariableTypeProvider = _resolver.localVariableTypeProvider,
_extensionResolver = _resolver.extensionResolver,
_inferenceHelper = inferenceHelper;
/// The scope used to resolve identifiers.
Scope get nameScope => _resolver.nameScope;
TypeSystemImpl get _typeSystem => _resolver.typeSystem;
void resolve(MethodInvocationImpl node,
List<WhyNotPromotedGetter> whyNotPromotedList) {
_invocation = node;
var nameNode = node.methodName;
String name = nameNode.name;
_currentName = Name(_definingLibraryUri, name);
var receiver = node.realTarget;
if (receiver == null) {
_resolveReceiverNull(node, nameNode, name, whyNotPromotedList);
return;
}
if (receiver is SimpleIdentifierImpl) {
var receiverElement = receiver.staticElement;
if (receiverElement is PrefixElement) {
_resolveReceiverPrefix(
node, receiverElement, nameNode, name, whyNotPromotedList);
return;
}
}
if (receiver is IdentifierImpl) {
var receiverElement = receiver.staticElement;
if (receiverElement is ExtensionElement) {
_resolveExtensionMember(node, receiver, receiverElement, nameNode, name,
whyNotPromotedList);
return;
}
}
if (receiver is SuperExpressionImpl) {
_resolveReceiverSuper(node, receiver, nameNode, name, whyNotPromotedList);
return;
}
if (receiver is ExtensionOverrideImpl) {
_resolveExtensionOverride(
node, receiver, nameNode, name, whyNotPromotedList);
return;
}
if (receiver is IdentifierImpl) {
var element = receiver.staticElement;
if (element is ClassElement) {
_resolveReceiverTypeLiteral(
node, element, nameNode, name, whyNotPromotedList);
return;
} else if (element is TypeAliasElement) {
var aliasedType = element.aliasedType;
if (aliasedType is InterfaceType) {
_resolveReceiverTypeLiteral(
node, aliasedType.element, nameNode, name, whyNotPromotedList);
return;
}
}
}
DartType receiverType = receiver.typeOrThrow;
if (_typeSystem.isDynamicBounded(receiverType)) {
_resolveReceiverDynamicBounded(node, whyNotPromotedList);
return;
}
if (receiverType is NeverTypeImpl) {
_resolveReceiverNever(node, receiver, receiverType, whyNotPromotedList);
return;
}
if (receiverType is VoidType) {
_reportUseOfVoidType(node, receiver, whyNotPromotedList);
return;
}
if (_migratableAstInfoProvider.isMethodInvocationNullAware(node) &&
_typeSystem.isNonNullableByDefault) {
receiverType = _typeSystem.promoteToNonNull(receiverType);
}
if (_typeSystem.isFunctionBounded(receiverType)) {
_resolveReceiverFunctionBounded(
node, receiver, receiverType, nameNode, name, whyNotPromotedList);
return;
}
_resolveReceiverType(
node: node,
receiver: receiver,
receiverType: receiverType,
nameNode: nameNode,
name: name,
receiverErrorNode: receiver,
whyNotPromotedList: whyNotPromotedList,
);
}
bool _isCoreFunction(DartType type) {
// TODO(scheglov) Can we optimize this?
return type is InterfaceType && type.isDartCoreFunction;
}
/// Record that the static type of the given node is the given type.
///
/// @param expression the node whose type is to be recorded
/// @param type the static type of the node
///
/// TODO(scheglov) this is duplicate
void _recordStaticType(ExpressionImpl expression, DartType type) {
var hooks = _resolver.migrationResolutionHooks;
if (hooks != null) {
type = hooks.modifyExpressionType(expression, type);
}
expression.staticType = type;
if (_resolver.typeSystem.isBottom(type)) {
_resolver.flowAnalysis?.flow?.handleExit();
}
}
void _reportInstanceAccessToStaticMember(
SimpleIdentifier nameNode,
ExecutableElement element,
bool nullReceiver,
) {
if (_resolver.enclosingExtension != null) {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode
.UNQUALIFIED_REFERENCE_TO_STATIC_MEMBER_OF_EXTENDED_TYPE,
nameNode,
[element.enclosingElement.displayName],
);
} else if (nullReceiver) {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.UNQUALIFIED_REFERENCE_TO_NON_LOCAL_STATIC_MEMBER,
nameNode,
[element.enclosingElement.displayName],
);
} else {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.INSTANCE_ACCESS_TO_STATIC_MEMBER,
nameNode,
[
nameNode.name,
element.kind.displayName,
element.enclosingElement.displayName,
],
);
}
}
void _reportInvocationOfNonFunction(MethodInvocationImpl node,
List<WhyNotPromotedGetter> whyNotPromotedList) {
_setDynamicResolution(node,
setNameTypeToDynamic: false, whyNotPromotedList: whyNotPromotedList);
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.INVOCATION_OF_NON_FUNCTION,
node.methodName,
[node.methodName.name],
);
}
void _reportPrefixIdentifierNotFollowedByDot(SimpleIdentifier target) {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.PREFIX_IDENTIFIER_NOT_FOLLOWED_BY_DOT,
target,
[target.name],
);
}
void _reportStaticAccessToInstanceMember(
ExecutableElement element, SimpleIdentifier nameNode) {
if (!element.isStatic) {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.STATIC_ACCESS_TO_INSTANCE_MEMBER,
nameNode,
[nameNode.name],
);
}
}
void _reportUndefinedFunction(
MethodInvocationImpl node, {
required String? prefix,
required String name,
required List<WhyNotPromotedGetter> whyNotPromotedList,
}) {
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
if (_definingLibrary.shouldIgnoreUndefined(prefix: prefix, name: name)) {
return;
}
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.UNDEFINED_FUNCTION,
node.methodName,
[node.methodName.name],
);
}
void _reportUseOfVoidType(MethodInvocationImpl node, AstNode errorNode,
List<WhyNotPromotedGetter> whyNotPromotedList) {
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.USE_OF_VOID_RESULT,
errorNode,
);
}
/// [InvocationExpression.staticInvokeType] has been set for the [node].
/// Use it to set context for arguments, and resolve them.
void _resolveArguments(MethodInvocationImpl node,
List<WhyNotPromotedGetter> whyNotPromotedList) {
// TODO(scheglov) This is bad, don't write raw type, carry it
_inferenceHelper.inferArgumentTypesForInvocation(
node,
node.methodName.staticType,
);
_resolver.visitArgumentList(node.argumentList,
whyNotPromotedList: whyNotPromotedList);
}
void _resolveArguments_finishInference(MethodInvocationImpl node,
List<WhyNotPromotedGetter> whyNotPromotedList) {
_resolveArguments(node, whyNotPromotedList);
// TODO(scheglov) This is bad, don't put / get raw FunctionType this way.
_inferenceHelper.inferGenericInvocationExpression(
node,
node.methodName.staticType,
);
DartType staticStaticType = _inferenceHelper.computeInvokeReturnType(
node.staticInvokeType,
);
_inferenceHelper.recordStaticType(node, staticStaticType);
}
/// Given that we are accessing a property of the given [classElement] with the
/// given [propertyName], return the element that represents the property.
Element? _resolveElement(
ClassElement classElement, SimpleIdentifier propertyName) {
// TODO(scheglov) Replace with class hierarchy.
String name = propertyName.name;
Element? element;
if (propertyName.inSetterContext()) {
element = classElement.getSetter(name);
}
element ??= classElement.getGetter(name);
element ??= classElement.getMethod(name);
if (element != null && element.isAccessibleIn(_definingLibrary)) {
return element;
}
return null;
}
void _resolveExtensionMember(
MethodInvocationImpl node,
Identifier receiver,
ExtensionElement extension,
SimpleIdentifierImpl nameNode,
String name,
List<WhyNotPromotedGetter> whyNotPromotedList) {
var getter = extension.getGetter(name);
if (getter != null) {
getter = _resolver.toLegacyElement(getter);
nameNode.staticElement = getter;
_reportStaticAccessToInstanceMember(getter, nameNode);
_rewriteAsFunctionExpressionInvocation(node, getter.returnType);
return;
}
var method = extension.getMethod(name);
if (method != null) {
method = _resolver.toLegacyElement(method);
nameNode.staticElement = method;
_reportStaticAccessToInstanceMember(method, nameNode);
_setResolution(node, method.type, whyNotPromotedList);
return;
}
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.UNDEFINED_EXTENSION_METHOD,
nameNode,
[name, extension.name],
);
}
void _resolveExtensionOverride(
MethodInvocationImpl node,
ExtensionOverride override,
SimpleIdentifierImpl nameNode,
String name,
List<WhyNotPromotedGetter> whyNotPromotedList) {
var result = _extensionResolver.getOverrideMember(override, name);
var member = _resolver.toLegacyElement(result.getter);
if (member == null) {
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.UNDEFINED_EXTENSION_METHOD,
nameNode,
[name, override.staticElement!.name],
);
return;
}
if (member.isStatic) {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.EXTENSION_OVERRIDE_ACCESS_TO_STATIC_MEMBER,
nameNode,
);
}
if (node.isCascaded) {
// Report this error and recover by treating it like a non-cascade.
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.EXTENSION_OVERRIDE_WITH_CASCADE,
override.extensionName,
);
}
nameNode.staticElement = member;
if (member is PropertyAccessorElement) {
return _rewriteAsFunctionExpressionInvocation(node, member.returnType);
}
_setResolution(node, member.type, whyNotPromotedList);
}
void _resolveReceiverDynamicBounded(MethodInvocationImpl node,
List<WhyNotPromotedGetter> whyNotPromotedList) {
var nameNode = node.methodName;
var objectElement = _typeSystem.typeProvider.objectElement;
var target = objectElement.getMethod(nameNode.name);
var hasMatchingObjectMethod = false;
if (target is MethodElement) {
var arguments = node.argumentList.arguments;
hasMatchingObjectMethod = arguments.length == target.parameters.length &&
!arguments.any((e) => e is NamedExpression);
if (hasMatchingObjectMethod) {
target = _resolver.toLegacyElement(target);
nameNode.staticElement = target;
node.staticInvokeType = target.type;
node.staticType = target.returnType;
}
}
if (!hasMatchingObjectMethod) {
nameNode.staticType = DynamicTypeImpl.instance;
node.staticInvokeType = DynamicTypeImpl.instance;
node.staticType = DynamicTypeImpl.instance;
}
_setExplicitTypeArgumentTypes();
_resolver.visitArgumentList(node.argumentList,
whyNotPromotedList: whyNotPromotedList);
}
void _resolveReceiverFunctionBounded(
MethodInvocationImpl node,
Expression receiver,
DartType receiverType,
SimpleIdentifierImpl nameNode,
String name,
List<WhyNotPromotedGetter> whyNotPromotedList,
) {
if (name == FunctionElement.CALL_METHOD_NAME) {
_setResolution(node, receiverType, whyNotPromotedList);
// TODO(scheglov) Replace this with using FunctionType directly.
// Here was erase resolution that _setResolution() sets.
nameNode.staticElement = null;
nameNode.staticType = _dynamicType;
return;
}
_resolveReceiverType(
node: node,
receiver: receiver,
receiverType: receiverType,
nameNode: nameNode,
name: name,
receiverErrorNode: nameNode,
whyNotPromotedList: whyNotPromotedList,
);
}
void _resolveReceiverNever(
MethodInvocationImpl node,
Expression receiver,
DartType receiverType,
List<WhyNotPromotedGetter> whyNotPromotedList,
) {
_setExplicitTypeArgumentTypes();
if (receiverType == NeverTypeImpl.instanceNullable) {
var methodName = node.methodName;
var objectElement = _resolver.typeProvider.objectElement;
var objectMember = objectElement.getMethod(methodName.name);
if (objectMember != null) {
objectMember = _resolver.toLegacyElement(objectMember);
methodName.staticElement = objectMember;
_setResolution(
node,
objectMember.type,
whyNotPromotedList,
);
} else {
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
_resolver.nullableDereferenceVerifier.report(methodName, receiverType,
errorCode: CompileTimeErrorCode
.UNCHECKED_METHOD_INVOCATION_OF_NULLABLE_VALUE);
}
return;
}
if (receiverType == NeverTypeImpl.instance) {
node.methodName.staticType = _dynamicType;
node.staticInvokeType = _dynamicType;
node.staticType = NeverTypeImpl.instance;
_resolveArguments(node, whyNotPromotedList);
_resolver.errorReporter.reportErrorForNode(
HintCode.RECEIVER_OF_TYPE_NEVER,
receiver,
);
return;
}
if (receiverType == NeverTypeImpl.instanceLegacy) {
node.methodName.staticType = _dynamicType;
node.staticInvokeType = _dynamicType;
node.staticType = _dynamicType;
_resolveArguments(node, whyNotPromotedList);
return;
}
}
void _resolveReceiverNull(
MethodInvocationImpl node,
SimpleIdentifierImpl nameNode,
String name,
List<WhyNotPromotedGetter> whyNotPromotedList) {
var element = nameScope.lookup(name).getter;
if (element != null) {
element = _resolver.toLegacyElement(element);
nameNode.staticElement = element;
if (element is MultiplyDefinedElement) {
MultiplyDefinedElement multiply = element;
element = multiply.conflictingElements[0];
}
if (element is PropertyAccessorElement) {
return _rewriteAsFunctionExpressionInvocation(node, element.returnType);
}
if (element is ExecutableElement) {
return _setResolution(node, element.type, whyNotPromotedList);
}
if (element is VariableElement) {
_resolver.checkReadOfNotAssignedLocalVariable(nameNode, element);
var targetType =
_localVariableTypeProvider.getType(nameNode, isRead: true);
return _rewriteAsFunctionExpressionInvocation(node, targetType);
}
// TODO(scheglov) This is a questionable distinction.
if (element is PrefixElement) {
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
return _reportPrefixIdentifierNotFollowedByDot(nameNode);
}
return _reportInvocationOfNonFunction(node, whyNotPromotedList);
}
DartType receiverType;
if (_resolver.enclosingClass != null) {
receiverType = _resolver.enclosingClass!.thisType;
} else if (_resolver.enclosingExtension != null) {
receiverType = _resolver.enclosingExtension!.extendedType;
} else {
return _reportUndefinedFunction(
node,
prefix: null,
name: node.methodName.name,
whyNotPromotedList: whyNotPromotedList,
);
}
_resolveReceiverType(
node: node,
receiver: null,
receiverType: receiverType,
nameNode: nameNode,
name: name,
receiverErrorNode: nameNode,
whyNotPromotedList: whyNotPromotedList,
);
}
void _resolveReceiverPrefix(
MethodInvocationImpl node,
PrefixElement prefix,
SimpleIdentifierImpl nameNode,
String name,
List<WhyNotPromotedGetter> whyNotPromotedList) {
// Note: prefix?.bar is reported as an error in ElementResolver.
if (name == FunctionElement.LOAD_LIBRARY_NAME) {
var imports = _definingLibrary.getImportsWithPrefix(prefix);
if (imports.length == 1 && imports[0].isDeferred) {
var importedLibrary = imports[0].importedLibrary;
var element = importedLibrary?.loadLibraryFunction;
element = _resolver.toLegacyElement(element);
if (element is ExecutableElement) {
nameNode.staticElement = element;
return _setResolution(
node, (element as ExecutableElement).type, whyNotPromotedList);
}
}
}
var element = prefix.scope.lookup(name).getter;
element = _resolver.toLegacyElement(element);
nameNode.staticElement = element;
if (element is MultiplyDefinedElement) {
MultiplyDefinedElement multiply = element;
element = multiply.conflictingElements[0];
}
if (element is PropertyAccessorElement) {
return _rewriteAsFunctionExpressionInvocation(node, element.returnType);
}
if (element is ExecutableElement) {
return _setResolution(node, element.type, whyNotPromotedList);
}
_reportUndefinedFunction(
node,
prefix: prefix.name,
name: name,
whyNotPromotedList: whyNotPromotedList,
);
}
void _resolveReceiverSuper(
MethodInvocationImpl node,
SuperExpression receiver,
SimpleIdentifierImpl nameNode,
String name,
List<WhyNotPromotedGetter> whyNotPromotedList) {
var enclosingClass = _resolver.enclosingClass;
if (SuperContext.of(receiver) != SuperContext.valid) {
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
return;
}
var target = _inheritance.getMember2(
enclosingClass!,
_currentName!,
forSuper: true,
);
target = _resolver.toLegacyElement(target);
// If there is that concrete dispatch target, then we are done.
if (target != null) {
nameNode.staticElement = target;
if (target is PropertyAccessorElement) {
return _rewriteAsFunctionExpressionInvocation(node, target.returnType);
}
_setResolution(node, target.type, whyNotPromotedList);
return;
}
// Otherwise, this is an error.
// But we would like to give the user at least some resolution.
// So, we try to find the interface target.
target = _inheritance.getInherited2(enclosingClass, _currentName!);
if (target != null) {
nameNode.staticElement = target;
_setResolution(node, target.type, whyNotPromotedList);
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.ABSTRACT_SUPER_MEMBER_REFERENCE,
nameNode,
[target.kind.displayName, name]);
return;
}
// Nothing help, there is no target at all.
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.UNDEFINED_SUPER_METHOD,
nameNode,
[name, enclosingClass.displayName]);
}
void _resolveReceiverType({
required MethodInvocationImpl node,
required Expression? receiver,
required DartType receiverType,
required SimpleIdentifierImpl nameNode,
required String name,
required Expression receiverErrorNode,
required List<WhyNotPromotedGetter> whyNotPromotedList,
}) {
var result = _resolver.typePropertyResolver.resolve(
receiver: receiver,
receiverType: receiverType,
name: name,
propertyErrorEntity: nameNode,
nameErrorEntity: nameNode,
);
var target = result.getter;
if (target != null) {
nameNode.staticElement = target;
if (target.isStatic) {
_reportInstanceAccessToStaticMember(
nameNode,
target,
receiver == null,
);
}
if (target is PropertyAccessorElement) {
return _rewriteAsFunctionExpressionInvocation(node, target.returnType);
}
return _setResolution(node, target.type, whyNotPromotedList);
}
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
if (!result.needsGetterError) {
return;
}
String receiverClassName = '<unknown>';
if (receiverType is InterfaceType) {
receiverClassName = receiverType.element.name;
} else if (receiverType is FunctionType) {
receiverClassName = 'Function';
}
if (!nameNode.isSynthetic) {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.UNDEFINED_METHOD,
nameNode,
[name, receiverClassName],
);
}
}
void _resolveReceiverTypeLiteral(
MethodInvocationImpl node,
ClassElement receiver,
SimpleIdentifierImpl nameNode,
String name,
List<WhyNotPromotedGetter> whyNotPromotedList) {
if (node.isCascaded) {
receiver = _typeType.element;
}
var element = _resolveElement(receiver, nameNode);
element = _resolver.toLegacyElement(element) as ExecutableElement?;
if (element != null) {
if (element is ExecutableElement) {
nameNode.staticElement = element;
if (element is PropertyAccessorElement) {
return _rewriteAsFunctionExpressionInvocation(
node, element.returnType);
}
_setResolution(node, element.type, whyNotPromotedList);
} else {
_reportInvocationOfNonFunction(node, whyNotPromotedList);
}
return;
}
_setDynamicResolution(node, whyNotPromotedList: whyNotPromotedList);
if (nameNode.name == 'new') {
// Attempting to invoke the unnamed constructor via `C.new(`.
if (_resolver.isConstructorTearoffsEnabled) {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.NEW_WITH_UNDEFINED_CONSTRUCTOR_DEFAULT,
nameNode,
[receiver.displayName],
);
} else {
// [ParserErrorCode.EXPERIMENT_NOT_ENABLED] is reported by the parser.
// Do not report extra errors.
}
} else {
_resolver.errorReporter.reportErrorForNode(
CompileTimeErrorCode.UNDEFINED_METHOD,
node.methodName,
[name, receiver.displayName],
);
}
}
/// If the given [type] is a type parameter, replace with its bound.
/// Otherwise, return the original type.
DartType _resolveTypeParameter(DartType type) {
if (type is TypeParameterType) {
return type.resolveToBound(_resolver.typeProvider.objectType);
}
return type;
}
/// We have identified that [node] is not a real [MethodInvocation],
/// because it does not invoke a method, but instead invokes the result
/// of a getter execution, or implicitly invokes the `call` method of
/// an [InterfaceType]. So, it should be represented as instead as a
/// [FunctionExpressionInvocation].
void _rewriteAsFunctionExpressionInvocation(
MethodInvocationImpl node,
DartType getterReturnType,
) {
var targetType = _resolveTypeParameter(getterReturnType);
_recordStaticType(node.methodName, targetType);
ExpressionImpl functionExpression;
var target = node.target;
if (target == null) {
functionExpression = node.methodName;
} else {
if (target is SimpleIdentifierImpl &&
target.staticElement is PrefixElement) {
functionExpression = astFactory.prefixedIdentifier(
target,
node.operator!,
node.methodName,
);
} else {
functionExpression = astFactory.propertyAccess(
target,
node.operator!,
node.methodName,
);
}
_resolver.flowAnalysis?.flow?.propertyGet(
functionExpression,
target,
node.methodName.name,
node.methodName.staticElement,
getterReturnType);
functionExpression.staticType = targetType;
}
var invocation = astFactory.functionExpressionInvocation(
functionExpression,
node.typeArguments,
node.argumentList,
);
NodeReplacer.replace(node, invocation);
node.setProperty(_rewriteResultKey, invocation);
InferenceContext.setTypeFromNode(invocation, node);
_resolver.flowAnalysis?.transferTestData(node, invocation);
}
void _setDynamicResolution(MethodInvocationImpl node,
{bool setNameTypeToDynamic = true,
required List<WhyNotPromotedGetter> whyNotPromotedList}) {
if (setNameTypeToDynamic) {
node.methodName.staticType = _dynamicType;
}
node.staticInvokeType = _dynamicType;
node.staticType = _dynamicType;
_setExplicitTypeArgumentTypes();
_resolveArguments_finishInference(node, whyNotPromotedList);
}
/// Set explicitly specified type argument types, or empty if not specified.
/// Inference is done in type analyzer, so inferred type arguments might be
/// set later.
///
/// TODO(scheglov) when we do inference in this resolver, do we need this?
void _setExplicitTypeArgumentTypes() {
var typeArgumentList = _invocation!.typeArguments;
if (typeArgumentList != null) {
var arguments = typeArgumentList.arguments;
_invocation!.typeArgumentTypes =
arguments.map((n) => n.typeOrThrow).toList();
} else {
_invocation!.typeArgumentTypes = [];
}
}
void _setResolution(MethodInvocationImpl node, DartType type,
List<WhyNotPromotedGetter> whyNotPromotedList) {
// TODO(scheglov) We need this for StaticTypeAnalyzer to run inference.
// But it seems weird. Do we need to know the raw type of a function?!
node.methodName.staticType = type;
if (type == _dynamicType || _isCoreFunction(type)) {
_setDynamicResolution(node,
setNameTypeToDynamic: false, whyNotPromotedList: whyNotPromotedList);
return;
}
if (type is FunctionType) {
_inferenceHelper.resolveMethodInvocation(
node: node, rawType: type, whyNotPromotedList: whyNotPromotedList);
return;
}
if (type is VoidType) {
return _reportUseOfVoidType(node, node.methodName, whyNotPromotedList);
}
_reportInvocationOfNonFunction(node, whyNotPromotedList);
}
/// Resolver visitor is separated from the elements resolver, which calls
/// this method resolver. If we rewrite a [MethodInvocation] node, this
/// method will return the resulting [FunctionExpressionInvocation], so
/// that the resolver visitor will know to continue resolving this new node.
static FunctionExpressionInvocation? getRewriteResult(
MethodInvocationImpl node) {
return node.getProperty(_rewriteResultKey);
}
/// Checks whether the given [expression] is a reference to a class. If it is
/// then the element representing the class is returned, otherwise `null` is
/// returned.
static ClassElement? getTypeReference(Expression expression) {
if (expression is Identifier) {
var staticElement = expression.staticElement;
if (staticElement is ClassElement) {
return staticElement;
}
}
return null;
}
}