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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Composition;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.AddImport;
using Microsoft.CodeAnalysis.CodeGeneration;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.GenerateType;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
using Microsoft.CodeAnalysis.Utilities;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.GenerateType
{
[ExportLanguageService(typeof(IGenerateTypeService), LanguageNames.CSharp), Shared]
internal class CSharpGenerateTypeService :
AbstractGenerateTypeService<CSharpGenerateTypeService, SimpleNameSyntax, ObjectCreationExpressionSyntax, ExpressionSyntax, TypeDeclarationSyntax, ArgumentSyntax>
{
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public CSharpGenerateTypeService()
{
}
protected override string DefaultFileExtension => ".cs";
protected override ExpressionSyntax GetLeftSideOfDot(SimpleNameSyntax simpleName)
=> simpleName.GetLeftSideOfDot();
protected override bool IsInCatchDeclaration(ExpressionSyntax expression)
=> expression.IsParentKind(SyntaxKind.CatchDeclaration);
protected override bool IsArrayElementType(ExpressionSyntax expression)
{
return expression.IsParentKind(SyntaxKind.ArrayType) &&
expression.Parent.IsParentKind(SyntaxKind.ArrayCreationExpression);
}
protected override bool IsInValueTypeConstraintContext(
SemanticModel semanticModel,
ExpressionSyntax expression,
CancellationToken cancellationToken)
{
if (expression is TypeSyntax typeSyntax && expression.Parent is TypeArgumentListSyntax typeArgumentList)
{
var symbolInfo = semanticModel.GetSymbolInfo(typeArgumentList.Parent, cancellationToken);
var symbol = symbolInfo.GetAnySymbol();
if (symbol.IsConstructor())
{
symbol = symbol.ContainingType;
}
var parameterIndex = typeArgumentList.Arguments.IndexOf(typeSyntax);
if (symbol is INamedTypeSymbol type)
{
type = type.OriginalDefinition;
var typeParameter = parameterIndex < type.TypeParameters.Length ? type.TypeParameters[parameterIndex] : null;
return typeParameter != null && typeParameter.HasValueTypeConstraint;
}
if (symbol is IMethodSymbol method)
{
method = method.OriginalDefinition;
var typeParameter = parameterIndex < method.TypeParameters.Length ? method.TypeParameters[parameterIndex] : null;
return typeParameter != null && typeParameter.HasValueTypeConstraint;
}
}
return false;
}
protected override bool IsInInterfaceList(ExpressionSyntax expression)
{
if (expression is TypeSyntax &&
expression.Parent is BaseTypeSyntax baseType &&
baseType.Parent is BaseListSyntax baseList &&
baseType.Type == expression)
{
// If it's after the first item, then it's definitely an interface.
if (baseList.Types[0] != expression.Parent)
{
return true;
}
// If it's in the base list of an interface or struct, then it's definitely an
// interface.
return baseList?.Parent.Kind() is
SyntaxKind.InterfaceDeclaration or
SyntaxKind.StructDeclaration or
SyntaxKind.RecordStructDeclaration;
}
if (expression is TypeSyntax &&
expression.Parent is TypeConstraintSyntax typeConstraint &&
typeConstraint.Parent is TypeParameterConstraintClauseSyntax constraintClause)
{
var index = constraintClause.Constraints.IndexOf(typeConstraint);
// If it's after the first item, then it's definitely an interface.
return index > 0;
}
return false;
}
protected override bool TryGetNameParts(ExpressionSyntax expression, out IList<string> nameParts)
{
return expression.TryGetNameParts(out nameParts);
}
protected override bool TryInitializeState(
SemanticDocument document,
SimpleNameSyntax simpleName,
CancellationToken cancellationToken,
out GenerateTypeServiceStateOptions generateTypeServiceStateOptions)
{
generateTypeServiceStateOptions = new GenerateTypeServiceStateOptions();
if (simpleName.IsVar)
{
return false;
}
if (SyntaxFacts.IsAliasQualifier(simpleName))
{
return false;
}
// Never offer if we're in a using directive, unless its a static using. The feeling here is that it's highly
// unlikely that this would be a location where a user would be wanting to generate
// something. They're really just trying to reference something that exists but
// isn't available for some reason (i.e. a missing reference).
var usingDirectiveSyntax = simpleName.GetAncestorOrThis<UsingDirectiveSyntax>();
if (usingDirectiveSyntax != null && usingDirectiveSyntax.StaticKeyword.Kind() != SyntaxKind.StaticKeyword)
{
return false;
}
ExpressionSyntax nameOrMemberAccessExpression = null;
if (simpleName.IsRightSideOfDot())
{
// This simplename comes from the cref
if (simpleName.IsParentKind(SyntaxKind.NameMemberCref))
{
return false;
}
nameOrMemberAccessExpression = generateTypeServiceStateOptions.NameOrMemberAccessExpression = (ExpressionSyntax)simpleName.Parent;
// If we're on the right side of a dot, then the left side better be a name (and
// not an arbitrary expression).
var leftSideExpression = simpleName.GetLeftSideOfDot();
if (leftSideExpression.Kind() is not (
SyntaxKind.QualifiedName or
SyntaxKind.IdentifierName or
SyntaxKind.AliasQualifiedName or
SyntaxKind.GenericName or
SyntaxKind.SimpleMemberAccessExpression))
{
return false;
}
}
else
{
nameOrMemberAccessExpression = generateTypeServiceStateOptions.NameOrMemberAccessExpression = simpleName;
}
// BUG(5712): Don't offer generate type in an enum's base list.
if (nameOrMemberAccessExpression.Parent is BaseTypeSyntax &&
nameOrMemberAccessExpression.Parent.IsParentKind(SyntaxKind.BaseList) &&
((BaseTypeSyntax)nameOrMemberAccessExpression.Parent).Type == nameOrMemberAccessExpression &&
nameOrMemberAccessExpression.Parent.Parent.IsParentKind(SyntaxKind.EnumDeclaration))
{
return false;
}
// If we can guarantee it's a type only context, great. Otherwise, we may not want to
// provide this here.
var semanticModel = document.SemanticModel;
if (!SyntaxFacts.IsInNamespaceOrTypeContext(nameOrMemberAccessExpression))
{
// Don't offer Generate Type in an expression context *unless* we're on the left
// side of a dot. In that case the user might be making a type that they're
// accessing a static off of.
var syntaxTree = semanticModel.SyntaxTree;
var start = nameOrMemberAccessExpression.SpanStart;
var tokenOnLeftOfStart = syntaxTree.FindTokenOnLeftOfPosition(start, cancellationToken);
var isExpressionContext = syntaxTree.IsExpressionContext(start, tokenOnLeftOfStart, attributes: true, cancellationToken: cancellationToken, semanticModel: semanticModel);
var isStatementContext = syntaxTree.IsStatementContext(start, tokenOnLeftOfStart, cancellationToken);
var isExpressionOrStatementContext = isExpressionContext || isStatementContext;
// Delegate Type Creation is not allowed in Non Type Namespace Context
generateTypeServiceStateOptions.IsDelegateAllowed = false;
if (!isExpressionOrStatementContext)
{
return false;
}
if (!simpleName.IsLeftSideOfDot() &&
!simpleName.IsInsideNameOfExpression(semanticModel, cancellationToken))
{
if (nameOrMemberAccessExpression == null || !nameOrMemberAccessExpression.IsKind(SyntaxKind.SimpleMemberAccessExpression) || !simpleName.IsRightSideOfDot())
{
return false;
}
var leftSymbol = semanticModel.GetSymbolInfo(((MemberAccessExpressionSyntax)nameOrMemberAccessExpression).Expression, cancellationToken).Symbol;
var token = simpleName.GetLastToken().GetNextToken();
// We let only the Namespace to be left of the Dot
if (leftSymbol == null ||
!leftSymbol.IsKind(SymbolKind.Namespace) ||
!token.IsKind(SyntaxKind.DotToken))
{
return false;
}
else
{
generateTypeServiceStateOptions.IsMembersWithModule = true;
generateTypeServiceStateOptions.IsTypeGeneratedIntoNamespaceFromMemberAccess = true;
}
}
// Global Namespace
if (!generateTypeServiceStateOptions.IsTypeGeneratedIntoNamespaceFromMemberAccess &&
!SyntaxFacts.IsInNamespaceOrTypeContext(simpleName))
{
var token = simpleName.GetLastToken().GetNextToken();
if (token.IsKind(SyntaxKind.DotToken) &&
simpleName.Parent == token.Parent)
{
generateTypeServiceStateOptions.IsMembersWithModule = true;
generateTypeServiceStateOptions.IsTypeGeneratedIntoNamespaceFromMemberAccess = true;
}
}
}
var fieldDeclaration = simpleName.GetAncestor<FieldDeclarationSyntax>();
if (fieldDeclaration != null &&
fieldDeclaration.Parent is CompilationUnitSyntax &&
document.Document.SourceCodeKind == SourceCodeKind.Regular)
{
return false;
}
// Check to see if Module could be an option in the Type Generation in Cross Language Generation
var nextToken = simpleName.GetLastToken().GetNextToken();
if (simpleName.IsLeftSideOfDot() ||
nextToken.IsKind(SyntaxKind.DotToken))
{
if (simpleName.IsRightSideOfDot())
{
if (simpleName.Parent is QualifiedNameSyntax parent)
{
var leftSymbol = semanticModel.GetSymbolInfo(parent.Left, cancellationToken).Symbol;
if (leftSymbol != null && leftSymbol.IsKind(SymbolKind.Namespace))
{
generateTypeServiceStateOptions.IsMembersWithModule = true;
}
}
}
}
if (SyntaxFacts.IsInNamespaceOrTypeContext(nameOrMemberAccessExpression))
{
if (nextToken.IsKind(SyntaxKind.DotToken))
{
// In Namespace or Type Context we cannot have Interface, Enum, Delegate as part of the Left Expression of a QualifiedName
generateTypeServiceStateOptions.IsDelegateAllowed = false;
generateTypeServiceStateOptions.IsInterfaceOrEnumNotAllowedInTypeContext = true;
generateTypeServiceStateOptions.IsMembersWithModule = true;
}
// case: class Goo<T> where T: MyType
if (nameOrMemberAccessExpression.GetAncestors<TypeConstraintSyntax>().Any())
{
generateTypeServiceStateOptions.IsClassInterfaceTypes = true;
return true;
}
// Events
if (nameOrMemberAccessExpression.GetAncestors<EventFieldDeclarationSyntax>().Any() ||
nameOrMemberAccessExpression.GetAncestors<EventDeclarationSyntax>().Any())
{
// Case : event goo name11
// Only Delegate
if (simpleName.Parent is not null and not QualifiedNameSyntax)
{
generateTypeServiceStateOptions.IsDelegateOnly = true;
return true;
}
// Case : event SomeSymbol.goo name11
if (nameOrMemberAccessExpression is QualifiedNameSyntax)
{
// Only Namespace, Class, Struct and Module are allowed to contain Delegate
// Case : event Something.Mytype.<Delegate> Identifier
if (nextToken.IsKind(SyntaxKind.DotToken))
{
if (nameOrMemberAccessExpression.Parent is not null and QualifiedNameSyntax)
{
return true;
}
throw ExceptionUtilities.Unreachable();
}
else
{
// Case : event Something.<Delegate> Identifier
generateTypeServiceStateOptions.IsDelegateOnly = true;
return true;
}
}
}
}
else
{
// MemberAccessExpression
if ((nameOrMemberAccessExpression.IsKind(SyntaxKind.SimpleMemberAccessExpression) || (nameOrMemberAccessExpression.Parent != null && nameOrMemberAccessExpression.IsParentKind(SyntaxKind.SimpleMemberAccessExpression)))
&& nameOrMemberAccessExpression.IsLeftSideOfDot())
{
// Check to see if the expression is part of Invocation Expression
ExpressionSyntax outerMostMemberAccessExpression = null;
if (nameOrMemberAccessExpression.IsKind(SyntaxKind.SimpleMemberAccessExpression))
{
outerMostMemberAccessExpression = nameOrMemberAccessExpression;
}
else
{
Debug.Assert(nameOrMemberAccessExpression.IsParentKind(SyntaxKind.SimpleMemberAccessExpression));
outerMostMemberAccessExpression = (ExpressionSyntax)nameOrMemberAccessExpression.Parent;
}
outerMostMemberAccessExpression = outerMostMemberAccessExpression.GetAncestorsOrThis<ExpressionSyntax>().SkipWhile(n => n != null && n.IsKind(SyntaxKind.SimpleMemberAccessExpression)).FirstOrDefault();
if (outerMostMemberAccessExpression is not null and InvocationExpressionSyntax)
{
generateTypeServiceStateOptions.IsEnumNotAllowed = true;
}
}
}
// Cases:
// // 1 - Function Address
// var s2 = new MyD2(goo);
// // 2 - Delegate
// MyD1 d = null;
// var s1 = new MyD2(d);
// // 3 - Action
// Action action1 = null;
// var s3 = new MyD2(action1);
// // 4 - Func
// Func<int> lambda = () => { return 0; };
// var s4 = new MyD3(lambda);
if (nameOrMemberAccessExpression.Parent is ObjectCreationExpressionSyntax)
{
var objectCreationExpressionOpt = generateTypeServiceStateOptions.ObjectCreationExpressionOpt = (ObjectCreationExpressionSyntax)nameOrMemberAccessExpression.Parent;
// Enum and Interface not Allowed in Object Creation Expression
generateTypeServiceStateOptions.IsInterfaceOrEnumNotAllowedInTypeContext = true;
if (objectCreationExpressionOpt.ArgumentList != null)
{
if (objectCreationExpressionOpt.ArgumentList.CloseParenToken.IsMissing)
{
return false;
}
// Get the Method symbol for the Delegate to be created
if (generateTypeServiceStateOptions.IsDelegateAllowed &&
objectCreationExpressionOpt.ArgumentList.Arguments is [{ Expression: (kind: not SyntaxKind.DeclarationExpression) expression }])
{
generateTypeServiceStateOptions.DelegateCreationMethodSymbol = GetMethodSymbolIfPresent(semanticModel, expression, cancellationToken);
}
else
{
generateTypeServiceStateOptions.IsDelegateAllowed = false;
}
}
if (objectCreationExpressionOpt.Initializer != null)
{
foreach (var expression in objectCreationExpressionOpt.Initializer.Expressions)
{
if (expression is not AssignmentExpressionSyntax simpleAssignmentExpression)
{
continue;
}
if (simpleAssignmentExpression.Left is not SimpleNameSyntax name)
{
continue;
}
generateTypeServiceStateOptions.PropertiesToGenerate.Add(name);
}
}
}
if (generateTypeServiceStateOptions.IsDelegateAllowed)
{
// MyD1 z1 = goo;
if (nameOrMemberAccessExpression.Parent is VariableDeclarationSyntax variableDeclaration &&
variableDeclaration.Variables.Count != 0)
{
var firstVarDeclWithInitializer = variableDeclaration.Variables.FirstOrDefault(var => var.Initializer != null && var.Initializer.Value != null);
if (firstVarDeclWithInitializer != null && firstVarDeclWithInitializer.Initializer != null && firstVarDeclWithInitializer.Initializer.Value != null)
{
generateTypeServiceStateOptions.DelegateCreationMethodSymbol = GetMethodSymbolIfPresent(semanticModel, firstVarDeclWithInitializer.Initializer.Value, cancellationToken);
}
}
// var w1 = (MyD1)goo;
if (nameOrMemberAccessExpression.Parent is CastExpressionSyntax castExpression &&
castExpression.Expression != null)
{
generateTypeServiceStateOptions.DelegateCreationMethodSymbol = GetMethodSymbolIfPresent(semanticModel, castExpression.Expression, cancellationToken);
}
}
return true;
}
private static IMethodSymbol GetMethodSymbolIfPresent(SemanticModel semanticModel, ExpressionSyntax expression, CancellationToken cancellationToken)
{
if (expression == null)
{
return null;
}
var memberGroup = semanticModel.GetMemberGroup(expression, cancellationToken);
if (memberGroup.Length != 0)
{
return memberGroup.ElementAt(0).IsKind(SymbolKind.Method) ? (IMethodSymbol)memberGroup.ElementAt(0) : null;
}
var expressionType = semanticModel.GetTypeInfo(expression, cancellationToken).Type;
if (expressionType.IsDelegateType())
{
return ((INamedTypeSymbol)expressionType).DelegateInvokeMethod;
}
var expressionSymbol = semanticModel.GetSymbolInfo(expression, cancellationToken).Symbol;
if (expressionSymbol.IsKind(SymbolKind.Method))
{
return (IMethodSymbol)expressionSymbol;
}
return null;
}
private static Accessibility DetermineAccessibilityConstraint(
State state,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
return semanticModel.DetermineAccessibilityConstraint(
state.NameOrMemberAccessExpression as TypeSyntax, cancellationToken);
}
private static bool AllContainingTypesArePublicOrProtected(
State state,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
return semanticModel.AllContainingTypesArePublicOrProtected(
state.NameOrMemberAccessExpression as TypeSyntax, cancellationToken);
}
protected override ImmutableArray<ITypeParameterSymbol> GetTypeParameters(
State state,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
if (state.SimpleName is GenericNameSyntax)
{
var genericName = (GenericNameSyntax)state.SimpleName;
var typeArguments = state.SimpleName.Arity == genericName.TypeArgumentList.Arguments.Count
? genericName.TypeArgumentList.Arguments.OfType<SyntaxNode>().ToList()
: Enumerable.Repeat<SyntaxNode>(null, state.SimpleName.Arity);
return GetTypeParameters(state, semanticModel, typeArguments, cancellationToken);
}
return ImmutableArray<ITypeParameterSymbol>.Empty;
}
protected override bool TryGetArgumentList(ObjectCreationExpressionSyntax objectCreationExpression, out IList<ArgumentSyntax> argumentList)
{
if (objectCreationExpression != null && objectCreationExpression.ArgumentList != null)
{
argumentList = objectCreationExpression.ArgumentList.Arguments.ToList();
return true;
}
argumentList = null;
return false;
}
protected override IList<ParameterName> GenerateParameterNames(
SemanticModel semanticModel, IList<ArgumentSyntax> arguments, CancellationToken cancellationToken)
{
return semanticModel.GenerateParameterNames(arguments, reservedNames: null, cancellationToken: cancellationToken);
}
public override string GetRootNamespace(CompilationOptions options)
=> string.Empty;
protected override bool IsInVariableTypeContext(ExpressionSyntax expression)
=> false;
protected override INamedTypeSymbol DetermineTypeToGenerateIn(SemanticModel semanticModel, SimpleNameSyntax simpleName, CancellationToken cancellationToken)
=> semanticModel.GetEnclosingNamedType(simpleName.SpanStart, cancellationToken);
protected override Accessibility GetAccessibility(State state, SemanticModel semanticModel, bool intoNamespace, CancellationToken cancellationToken)
{
var accessibility = DetermineDefaultAccessibility(state, semanticModel, intoNamespace, cancellationToken);
if (!state.IsTypeGeneratedIntoNamespaceFromMemberAccess)
{
var accessibilityConstraint = DetermineAccessibilityConstraint(state, semanticModel, cancellationToken);
if (accessibilityConstraint is Accessibility.Public or
Accessibility.Internal)
{
accessibility = accessibilityConstraint;
}
else if (accessibilityConstraint is Accessibility.Protected or
Accessibility.ProtectedOrInternal)
{
// If nested type is declared in public type then we should generate public type instead of internal
accessibility = AllContainingTypesArePublicOrProtected(state, semanticModel, cancellationToken)
? Accessibility.Public
: Accessibility.Internal;
}
}
return accessibility;
}
protected override ITypeSymbol DetermineArgumentType(SemanticModel semanticModel, ArgumentSyntax argument, CancellationToken cancellationToken)
=> argument.DetermineParameterType(semanticModel, cancellationToken);
protected override bool IsConversionImplicit(Compilation compilation, ITypeSymbol sourceType, ITypeSymbol targetType)
=> compilation.ClassifyConversion(sourceType, targetType).IsImplicit;
public override async Task<(INamespaceSymbol, INamespaceOrTypeSymbol, Location)> GetOrGenerateEnclosingNamespaceSymbolAsync(
INamedTypeSymbol namedTypeSymbol, string[] containers, Document selectedDocument, SyntaxNode selectedDocumentRoot, CancellationToken cancellationToken)
{
var compilationUnit = (CompilationUnitSyntax)selectedDocumentRoot;
var semanticModel = await selectedDocument.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
if (containers.Length != 0)
{
// Search the NS declaration in the root
var containerList = new List<string>(containers);
var enclosingNamespace = FindNamespaceInMemberDeclarations(compilationUnit.Members, indexDone: 0, containerList);
if (enclosingNamespace != null)
{
var enclosingNamespaceSymbol = semanticModel.GetSymbolInfo(enclosingNamespace.Name, cancellationToken);
if (enclosingNamespaceSymbol.Symbol is INamespaceSymbol namespaceSymbol)
return (namespaceSymbol, namedTypeSymbol, enclosingNamespace.GetLastToken().GetLocation());
}
}
var globalNamespace = semanticModel.GetEnclosingNamespace(0, cancellationToken);
var rootNamespaceOrType = namedTypeSymbol.GenerateRootNamespaceOrType(containers);
var lastMember = compilationUnit.Members.LastOrDefault();
var afterThisLocation = lastMember != null
? semanticModel.SyntaxTree.GetLocation(new TextSpan(lastMember.Span.End, 0))
: semanticModel.SyntaxTree.GetLocation(new TextSpan());
return (globalNamespace, rootNamespaceOrType, afterThisLocation);
}
private BaseNamespaceDeclarationSyntax FindNamespaceInMemberDeclarations(SyntaxList<MemberDeclarationSyntax> members, int indexDone, List<string> containers)
{
foreach (var member in members)
{
if (member is BaseNamespaceDeclarationSyntax namespaceDeclaration)
{
var found = FindNamespaceInNamespace(namespaceDeclaration, indexDone, containers);
if (found != null)
return found;
}
}
return null;
}
private BaseNamespaceDeclarationSyntax FindNamespaceInNamespace(BaseNamespaceDeclarationSyntax namespaceDecl, int indexDone, List<string> containers)
{
if (namespaceDecl.Name is AliasQualifiedNameSyntax)
return null;
var namespaceContainers = new List<string>();
GetNamespaceContainers(namespaceDecl.Name, namespaceContainers);
if (namespaceContainers.Count + indexDone > containers.Count ||
!IdentifierMatches(indexDone, namespaceContainers, containers))
{
return null;
}
indexDone += namespaceContainers.Count;
if (indexDone == containers.Count)
return namespaceDecl;
return FindNamespaceInMemberDeclarations(namespaceDecl.Members, indexDone, containers);
}
private static bool IdentifierMatches(int indexDone, List<string> namespaceContainers, List<string> containers)
{
for (var i = 0; i < namespaceContainers.Count; ++i)
{
if (namespaceContainers[i] != containers[indexDone + i])
{
return false;
}
}
return true;
}
private void GetNamespaceContainers(NameSyntax name, List<string> namespaceContainers)
{
if (name is QualifiedNameSyntax qualifiedName)
{
GetNamespaceContainers(qualifiedName.Left, namespaceContainers);
namespaceContainers.Add(qualifiedName.Right.Identifier.ValueText);
}
else
{
Debug.Assert(name is SimpleNameSyntax);
namespaceContainers.Add(((SimpleNameSyntax)name).Identifier.ValueText);
}
}
internal override bool TryGetBaseList(ExpressionSyntax expression, out TypeKindOptions typeKindValue)
{
typeKindValue = TypeKindOptions.AllOptions;
if (expression == null)
{
return false;
}
var node = expression as SyntaxNode;
while (node != null)
{
if (node is BaseListSyntax)
{
if (node.Parent.Kind() is SyntaxKind.InterfaceDeclaration or SyntaxKind.StructDeclaration or SyntaxKind.RecordStructDeclaration)
{
typeKindValue = TypeKindOptions.Interface;
return true;
}
typeKindValue = TypeKindOptions.BaseList;
return true;
}
node = node.Parent;
}
return false;
}
internal override bool IsPublicOnlyAccessibility(ExpressionSyntax expression, Project project)
{
if (expression == null)
return false;
var node = expression as SyntaxNode;
SyntaxNode previousNode = null;
while (node != null)
{
// Types in BaseList, Type Constraint or Member Types cannot be of more restricted accessibility than the declaring type
if ((node is BaseListSyntax || node is TypeParameterConstraintClauseSyntax) &&
node.Parent != null &&
node.Parent is TypeDeclarationSyntax)
{
if (node.Parent is TypeDeclarationSyntax typeDecl)
{
if (typeDecl.GetModifiers().Any(m => m.Kind() == SyntaxKind.PublicKeyword))
{
return IsAllContainingTypeDeclsPublic(typeDecl);
}
else
{
// The Type Decl which contains the BaseList does not contain Public
return false;
}
}
throw ExceptionUtilities.Unreachable();
}
if ((node is EventDeclarationSyntax || node is EventFieldDeclarationSyntax) &&
node.Parent != null &&
node.Parent is TypeDeclarationSyntax)
{
// Make sure the GFU is not inside the Accessors
if (previousNode is not null and AccessorListSyntax)
{
return false;
}
// Make sure that Event Declaration themselves are Public in the first place
if (!node.GetModifiers().Any(m => m.Kind() == SyntaxKind.PublicKeyword))
{
return false;
}
return IsAllContainingTypeDeclsPublic(node);
}
previousNode = node;
node = node.Parent;
}
return false;
}
private static bool IsAllContainingTypeDeclsPublic(SyntaxNode node)
{
// Make sure that all the containing Type Declarations are also Public
var containingTypeDeclarations = node.GetAncestors<TypeDeclarationSyntax>();
if (containingTypeDeclarations.Count() == 0)
{
return true;
}
else
{
return containingTypeDeclarations.All(typedecl => typedecl.GetModifiers().Any(m => m.Kind() == SyntaxKind.PublicKeyword));
}
}
internal override bool IsGenericName(SimpleNameSyntax simpleName)
=> simpleName is GenericNameSyntax;
internal override bool IsSimpleName(ExpressionSyntax expression)
=> expression is SimpleNameSyntax;
internal override async Task<Solution> TryAddUsingsOrImportToDocumentAsync(
Solution updatedSolution, SyntaxNode modifiedRoot, Document document, SimpleNameSyntax simpleName, string includeUsingsOrImports, AddImportPlacementOptionsProvider fallbackOptions, CancellationToken cancellationToken)
{
// Nothing to include
if (string.IsNullOrWhiteSpace(includeUsingsOrImports))
{
return updatedSolution;
}
SyntaxNode root = null;
if (modifiedRoot == null)
{
root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
}
else
{
root = modifiedRoot;
}
if (root is CompilationUnitSyntax compilationRoot)
{
var usingDirective = SyntaxFactory.UsingDirective(SyntaxFactory.ParseName(includeUsingsOrImports));
// Check if the usings is already present
if (compilationRoot.Usings.Where(n => n != null && n.Alias == null)
.Select(n => n.Name.ToString())
.Any(n => n.Equals(includeUsingsOrImports)))
{
return updatedSolution;
}
// Check if the GFU is triggered from the namespace same as the usings namespace
if (await IsWithinTheImportingNamespaceAsync(document, simpleName.SpanStart, includeUsingsOrImports, cancellationToken).ConfigureAwait(false))
{
return updatedSolution;
}
var addImportOptions = await document.GetAddImportPlacementOptionsAsync(fallbackOptions, cancellationToken).ConfigureAwait(false);
var addedCompilationRoot = compilationRoot.AddUsingDirectives(new[] { usingDirective }, addImportOptions.PlaceSystemNamespaceFirst, Formatter.Annotation);
updatedSolution = updatedSolution.WithDocumentSyntaxRoot(document.Id, addedCompilationRoot, PreservationMode.PreserveIdentity);
}
return updatedSolution;
}
private static ITypeSymbol GetPropertyType(
SimpleNameSyntax propertyName,
SemanticModel semanticModel,
ITypeInferenceService typeInference,
CancellationToken cancellationToken)
{
if (propertyName.Parent is AssignmentExpressionSyntax parentAssignment)
{
return typeInference.InferType(
semanticModel, parentAssignment.Left, objectAsDefault: true, cancellationToken: cancellationToken);
}
if (propertyName.Parent is IsPatternExpressionSyntax isPatternExpression)
{
return typeInference.InferType(
semanticModel, isPatternExpression.Expression, objectAsDefault: true, cancellationToken: cancellationToken);
}
return null;
}
private static IPropertySymbol CreatePropertySymbol(
SimpleNameSyntax propertyName, ITypeSymbol propertyType)
{
return CodeGenerationSymbolFactory.CreatePropertySymbol(
attributes: ImmutableArray<AttributeData>.Empty,
accessibility: Accessibility.Public,
modifiers: new DeclarationModifiers(),
explicitInterfaceImplementations: default,
name: propertyName.Identifier.ValueText,
type: propertyType,
refKind: RefKind.None,
parameters: default,
getMethod: s_accessor,
setMethod: s_accessor,
isIndexer: false);
}
private static readonly IMethodSymbol s_accessor = CodeGenerationSymbolFactory.CreateAccessorSymbol(
attributes: default,
accessibility: Accessibility.Public,
statements: default);
internal override bool TryGenerateProperty(
SimpleNameSyntax propertyName,
SemanticModel semanticModel,
ITypeInferenceService typeInference,
CancellationToken cancellationToken,
out IPropertySymbol property)
{
var propertyType = GetPropertyType(propertyName, semanticModel, typeInference, cancellationToken);
if (propertyType is null or IErrorTypeSymbol)
{
property = CreatePropertySymbol(propertyName, semanticModel.Compilation.ObjectType);
return property != null;
}
property = CreatePropertySymbol(propertyName, propertyType);
return property != null;
}
}
}
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