public static void UsingBorrowBorrowOrIncrementUsage()
{
using var set = PooledSet <int> .Borrow();
using var meh = set.IncrementUsage();
using var meh1 = meh.IncrementUsage();
}
public static void UsingBorrowAddForeach()
{
using var set = PooledSet <int> .Borrow();
_ = set.Add(1);
foreach (var i in set)
{
}
}
public static void UsingBorrowAddForeachCallId()
{
using (var set = PooledSet <int> .Borrow())
{
set.Add(1);
foreach (var i in set)
{
var j = Id(i);
}
}
}
internal static bool TryGetReturnType(ClassDeclarationSyntax classDeclaration, SemanticModel semanticModel, CancellationToken cancellationToken, [NotNullWhen(true)] out ITypeSymbol?returnType)
{
returnType = null;
if (classDeclaration.TryFindMethod("ProvideValue", out var convertMethod) &&
convertMethod.ReturnType is PredefinedTypeSyntax predefinedType &&
predefinedType.Keyword.ValueText == "object" &&
convertMethod.ParameterList != null &&
convertMethod.ParameterList.Parameters.Count == 1)
{
using var walker = ReturnValueWalker.Borrow(convertMethod);
using var returnTypes = PooledSet <ITypeSymbol> .Borrow();
returnTypes.UnionWith(walker.ReturnValues.Select(x => semanticModel.GetTypeInfoSafe(x, cancellationToken).Type));
return(returnTypes.TrySingle <ITypeSymbol>(out returnType));
}
return(false);
}
internal static Result IsAlreadyAssignedWithCreated(ExpressionSyntax disposable, SemanticModel semanticModel, CancellationToken cancellationToken, out ISymbol assignedSymbol)
{
if (!IsPotentiallyAssignableFrom(disposable, semanticModel, cancellationToken))
{
assignedSymbol = null;
return(Result.No);
}
var symbol = semanticModel.GetSymbolSafe(disposable, cancellationToken);
if (symbol is IPropertySymbol property &&
IsAssignableFrom(property.Type, semanticModel.Compilation) &&
property.TryGetSetter(cancellationToken, out var setter) &&
(setter.ExpressionBody != null || setter.Body != null))
{
using (var assignedSymbols = PooledSet <ISymbol> .Borrow())
{
using (var pooledAssigned = AssignmentExecutionWalker.Borrow(setter, Scope.Recursive, semanticModel, cancellationToken))
{
foreach (var assigned in pooledAssigned.Assignments)
{
if (assigned.Right is IdentifierNameSyntax identifierName &&
identifierName.Identifier.ValueText == "value" &&
IsPotentiallyAssignableFrom(assigned.Left, semanticModel, cancellationToken) &&
semanticModel.GetSymbolSafe(assigned.Left, cancellationToken) is ISymbol candidate &&
candidate.IsEitherKind(SymbolKind.Field, SymbolKind.Property))
{
assignedSymbols.Add(candidate);
}
}
}
assignedSymbol = null;
var result = Result.No;
foreach (var candidate in assignedSymbols)
{
switch (IsAssignedWithCreated(candidate, disposable, semanticModel, cancellationToken))
{
case Result.Unknown:
if (result == Result.No)
{
assignedSymbol = candidate;
result = Result.Unknown;
}
break;
case Result.Yes:
assignedSymbol = candidate;
return(Result.Yes);
case Result.AssumeYes:
assignedSymbol = candidate;
result = Result.AssumeYes;
break;
case Result.No:
case Result.AssumeNo:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
return(result);
}
}
if (symbol is IParameterSymbol parameter &&
disposable.TryFirstAncestor <ArrowExpressionClauseSyntax>(out _))
{
assignedSymbol = null;
return(Result.No);
}
using (var assignedValues = AssignedValueWalker.Borrow(disposable, semanticModel, cancellationToken))
{
assignedSymbol = assignedValues.CurrentSymbol;
if (assignedValues.Count == 1 &&
disposable.Parent is AssignmentExpressionSyntax assignment)
{
if (assignment.Parent is ParenthesizedExpressionSyntax parenthesizedExpression &&
parenthesizedExpression.Parent is BinaryExpressionSyntax binary &&
binary.IsKind(SyntaxKind.CoalesceExpression))
{
// lazy
return(Result.No);
}
}
if (symbol.IsEither <IParameterSymbol, ILocalSymbol>())
{
assignedValues.RemoveAll(x => IsReturnedBefore(x));
}
using (var recursive = RecursiveValues.Borrow(assignedValues, semanticModel, cancellationToken))
{
return(IsAnyCreation(recursive, semanticModel, cancellationToken));
}
}
bool IsReturnedBefore(ExpressionSyntax expression)
{
if (expression.TryFirstAncestor(out BlockSyntax block) &&
block.Statements.TryFirstOfType(out ReturnStatementSyntax _))
{
if (expression.TryFirstAncestor <ForEachStatementSyntax>(out _) ||
expression.TryFirstAncestor <ForStatementSyntax>(out _) ||
expression.TryFirstAncestor <WhileStatementSyntax>(out _))
{
return(true);
}
return(!block.Contains(disposable) &&
block.SharesAncestor(disposable, out MemberDeclarationSyntax _));
}
return(false);
}
}
internal static bool TryGetConversionTypes(ClassDeclarationSyntax classDeclaration, SemanticModel semanticModel, CancellationToken cancellationToken, out ITypeSymbol sourceType, out ITypeSymbol targetType)
{
sourceType = null;
targetType = null;
if (classDeclaration.TryFindMethod("Convert", out var convertMethod) &&
convertMethod.ReturnType is PredefinedTypeSyntax returnType &&
returnType.Keyword.ValueText == "object" &&
convertMethod.ParameterList != null &&
convertMethod.ParameterList.Parameters.Count == 4 &&
convertMethod.ParameterList.Parameters.TryFirst(out var valueParameter))
{
using (var returnValues = ReturnValueWalker.Borrow(convertMethod))
{
using (var returnTypes = PooledSet <ITypeSymbol> .Borrow())
{
foreach (var returnValue in returnValues.ReturnValues)
{
AddReturnType(returnTypes, returnValue);
}
return(returnTypes.TrySingle(out targetType) &&
ConversionWalker.TryGetCommonBase(
convertMethod,
semanticModel.GetDeclaredSymbolSafe(valueParameter, cancellationToken),
semanticModel,
cancellationToken,
out sourceType));
}
}
}
return(false);
void AddReturnType(PooledSet <ITypeSymbol> returnTypes, ExpressionSyntax returnValue)
{
switch (returnValue)
{
case LiteralExpressionSyntax literal when literal.IsKind(SyntaxKind.NullLiteralExpression):
break;
case ConditionalExpressionSyntax ternary:
AddReturnType(returnTypes, ternary.WhenTrue);
AddReturnType(returnTypes, ternary.WhenFalse);
break;
case BinaryExpressionSyntax coalesce when coalesce.IsKind(SyntaxKind.CoalesceExpression):
AddReturnType(returnTypes, coalesce.Left);
AddReturnType(returnTypes, coalesce.Right);
break;
case IdentifierNameSyntax _:
case MemberAccessExpressionSyntax _:
var type = semanticModel.GetTypeInfoSafe(returnValue, cancellationToken).Type;
if (type == KnownSymbol.Object &&
semanticModel.GetSymbolSafe(returnValue, cancellationToken) is ISymbol symbol &&
symbol.IsEither <IFieldSymbol, IPropertySymbol>())
{
switch (symbol)
{
case IFieldSymbol field:
if (field.Type == KnownSymbol.Object &&
field.DeclaredAccessibility == Accessibility.Private &&
returnValue.FirstAncestor <TypeDeclarationSyntax>() is TypeDeclarationSyntax typeDeclaration)
{
using (var walker = AssignmentExecutionWalker.Borrow(typeDeclaration, Scope.Instance, semanticModel, cancellationToken))
{
foreach (var assignment in walker.Assignments)
{
if (semanticModel.TryGetSymbol(assignment.Left, cancellationToken, out IFieldSymbol assigned) &&
FieldSymbolComparer.Equals(assigned, field))
{
returnTypes.Add(semanticModel.GetTypeInfoSafe(assignment.Right, cancellationToken).Type);
}
}
}
}
else
{
returnTypes.Add(field.Type);
}
return;
case IPropertySymbol property:
returnTypes.Add(property.Type);
return;
}
}
else
{
returnTypes.Add(type);
}
break;
public static void UsingBorrow()
{
using (PooledSet <int> .Borrow())
{
}
}
/// <summary>
/// Walk <paramref name="containing"/> then all documents in project.
/// </summary>
/// <param name="containing">The <see cref="Document"/>.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> that cancels the operation.</param>
/// <returns>The <see cref="CodeStyleResult"/> found.</returns>
protected async Task <CodeStyleResult> CheckCoreAsync(Document containing, CancellationToken cancellationToken)
{
if (containing is null)
{
throw new ArgumentNullException(nameof(containing));
}
if (await Check(containing).ConfigureAwait(false) is { } containingResult&&
containingResult != CodeStyleResult.NotFound)
{
return(containingResult);
}
using var set = PooledSet <Document> .Borrow();
foreach (var document in Documents())
{
if (set.Add(document) &&
await Check(document).ConfigureAwait(false) is { } documentResult&&
documentResult != CodeStyleResult.NotFound)
{
return(documentResult);
}
}
return(CodeStyleResult.NotFound);
async Task <CodeStyleResult> Check(Document candidate)
{
if (IsExcluded(candidate.FilePath))
{
return(CodeStyleResult.NotFound);
}
var tree = await candidate.GetSyntaxTreeAsync(cancellationToken).ConfigureAwait(false);
if (tree is null)
{
return(CodeStyleResult.NotFound);
}
if (IsExcluded(tree.FilePath))
{
return(CodeStyleResult.NotFound);
}
if (tree.TryGetRoot(out var root))
{
this.Visit(root);
return(this.result);
}
return(CodeStyleResult.NotFound);
}
IEnumerable <Document> Documents()
{
foreach (var document in containing.Project.Documents)
{
if (Equals(document.Folders, containing.Folders))
{
yield return(document);
}
}
foreach (var document in containing.Project.Documents)
{
if (IsIn(document.Folders, containing.Folders))
{
yield return(document);
}
}
foreach (var document in containing.Project.Documents)
{
if (document.Folders.TrySingle(out var folder) &&
folder == "obj")
{
continue;
}
yield return(document);
}
internal static bool TryGetCommonBase(SyntaxNode node, IParameterSymbol symbol, SemanticModel semanticModel, CancellationToken cancellationToken, out ITypeSymbol sourceType)
{
sourceType = null;
using (var walker = Borrow(node))
{
foreach (var cast in walker.casts)
{
if (IsFor(cast.Expression, symbol, semanticModel, cancellationToken) &&
!TryGetCommonBase(sourceType, cast.Type, out sourceType))
{
return(false);
}
}
foreach (var cast in walker.asCasts)
{
if (IsFor(cast.Left, symbol, semanticModel, cancellationToken) &&
!TryGetCommonBase(sourceType, cast.Right as TypeSyntax, out sourceType))
{
return(false);
}
}
foreach (var isCheck in walker.isChecks)
{
if (IsFor(isCheck.Left, symbol, semanticModel, cancellationToken) &&
!TryGetCommonBase(sourceType, isCheck.Right as TypeSyntax, out sourceType))
{
return(false);
}
}
foreach (var isPattern in walker.isPatterns)
{
if (isPattern.Pattern is DeclarationPatternSyntax declarationPattern &&
IsFor(isPattern.Expression, symbol, semanticModel, cancellationToken) &&
!TryGetCommonBase(sourceType, declarationPattern.Type, out sourceType))
{
return(false);
}
}
foreach (var label in walker.caseLabels)
{
if (label.Pattern is DeclarationPatternSyntax declarationPattern &&
IsFor(label.FirstAncestor <SwitchStatementSyntax>().Expression, symbol, semanticModel, cancellationToken) &&
!TryGetCommonBase(sourceType, declarationPattern.Type, out sourceType))
{
return(false);
}
}
// If we couldn't "guess" a source type we take parameters type
if (sourceType == null)
{
sourceType = symbol.Type;
}
return(true);
}
bool IsFor(ExpressionSyntax e, ISymbol s, SemanticModel sm, CancellationToken ct)
{
if (e is IdentifierNameSyntax idn &&
idn.Identifier.ValueText != symbol.Name)
{
return(false);
}
return(ReferenceEquals(sm.GetSymbolSafe(e, ct), s));
}
bool TryGetCommonBase(ITypeSymbol?t1, TypeSyntax?ts, out ITypeSymbol result)
{
result = null !;
if (ts == null)
{
return(false);
}
var t2 = semanticModel.GetTypeInfoSafe(ts, cancellationToken).Type;
if (t2 == null)
{
return(false);
}
if (ReferenceEquals(t1, t2))
{
result = t1;
return(true);
}
if (t1 == null ||
t1.IsAssignableTo(t2, semanticModel.Compilation))
{
result = t2;
return(true);
}
if (t2.IsAssignableTo(t1, semanticModel.Compilation))
{
result = t1;
return(true);
}
using (var set = PooledSet <ITypeSymbol> .Borrow())
{
set.UnionWith(t1.RecursiveBaseTypes());
set.IntersectWith(t2.RecursiveBaseTypes());
return(set.TryFirst(x => x is INamedTypeSymbol namedType && namedType.IsGenericType, out result) ||
set.TryFirst(out result));
}
}
}