private static bool TryGetAssignedFieldOrProperty(ArgumentSyntax argument, IMethodSymbol method, SemanticModel semanticModel, CancellationToken cancellationToken, out ISymbol member)
{
member = null;
if (method == null)
{
return(false);
}
if (method.TrySingleDeclaration(cancellationToken, out BaseMethodDeclarationSyntax methodDeclaration) &&
methodDeclaration.TryFindParameter(argument, out var parameter))
{
var parameterSymbol = semanticModel.GetDeclaredSymbolSafe(parameter, cancellationToken);
if (AssignmentExecutionWalker.FirstWith(parameterSymbol, methodDeclaration.Body, Scope.Member, semanticModel, cancellationToken, out var assignment))
{
member = semanticModel.GetSymbolSafe(assignment.Left, cancellationToken);
if (member is IFieldSymbol ||
member is IPropertySymbol)
{
return(true);
}
}
if (methodDeclaration is ConstructorDeclarationSyntax ctor &&
ctor.Initializer is ConstructorInitializerSyntax initializer &&
initializer.ArgumentList != null &&
initializer.ArgumentList.Arguments.TrySingle(x => x.Expression is IdentifierNameSyntax identifier && identifier.Identifier.ValueText == parameter.Identifier.ValueText, out var chainedArgument))
{
var chained = semanticModel.GetSymbolSafe(ctor.Initializer, cancellationToken);
return(TryGetAssignedFieldOrProperty(chainedArgument, chained, semanticModel, cancellationToken, out member));
}
}
return(false);
}
public static void FieldCtorArgInNested(SearchScope scope)
{
var code = @"
namespace N
{
using System.IO;
internal class C
{
private StreamReader reader;
internal C(Stream stream)
{
this.reader = new StreamReader(stream);
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("stream");
var ctor = syntaxTree.FindConstructorDeclaration("C(Stream stream)");
var symbol = semanticModel.GetDeclaredSymbol(value, CancellationToken.None);
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out var result));
Assert.AreEqual("this.reader = new StreamReader(stream)", result.ToString());
using var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None);
Assert.AreEqual("this.reader = new StreamReader(stream)", walker.Assignments.Single().ToString());
}
public static void GenericFieldTypedCtorArg(SearchScope scope)
{
var code = @"
namespace N
{
internal class C<T>
{
private readonly T value;
internal C(T arg)
{
this.value = arg;
}
public static C<int> Create(int n) => new C<int>(n);
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var argument = syntaxTree.FindArgument("n");
Assert.AreEqual(true, semanticModel.TryGetSymbol(argument.Parent.Parent, CancellationToken.None, out IMethodSymbol method));
Assert.AreEqual(true, method.TryFindParameter(argument, out var symbol));
var ctor = syntaxTree.FindConstructorDeclaration("C(T arg)");
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out var result));
Assert.AreEqual("this.value = arg", result.ToString());
using var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None);
Assert.AreEqual("this.value = arg", walker.Assignments.Single().ToString());
}
public static void GenericFieldCtorArg(SearchScope scope)
{
var code = @"
namespace N
{
internal class C<T>
{
private readonly T value;
internal C(T arg)
{
this.value = arg;
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, Settings.Default.MetadataReferences);
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("arg");
var ctor = syntaxTree.FindConstructorDeclaration("C(T arg)");
Assert.AreEqual(true, semanticModel.TryGetSymbol(value, CancellationToken.None, out var symbol));
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out var result));
Assert.AreEqual("this.value = arg", result.ToString());
using var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None);
Assert.AreEqual("this.value = arg", walker.Assignments.Single().ToString());
}
public static void FieldCtorArgViaLocal(SearchScope scope)
{
var code = @"
namespace N
{
internal class C
{
private readonly int value;
internal C(int arg)
{
var temp = arg;
this.value = temp;
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var ctor = syntaxTree.FindConstructorDeclaration("C(int arg)");
var symbol = semanticModel.GetDeclaredSymbol(syntaxTree.FindParameter("int arg"), CancellationToken.None);
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out var result));
Assert.AreEqual("this.value = temp", result.ToString());
using var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None);
Assert.AreEqual("this.value = temp", walker.Assignments.Single().ToString());
}
public void FieldCtorArg(Search search)
{
var testCode = @"
namespace RoslynSandbox
{
internal class Foo
{
private readonly int value;
internal Foo(int arg)
{
this.value = arg;
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(testCode);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindAssignmentExpression("this.value = arg").Right;
var ctor = syntaxTree.FindConstructorDeclaration("Foo(int arg)");
var arg = semanticModel.GetSymbolSafe(value, CancellationToken.None);
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(arg, ctor, search, semanticModel, CancellationToken.None, out var result));
Assert.AreEqual("this.value = arg", result?.ToString());
}
public void FieldCtorArg(Scope scope)
{
var testCode = @"
namespace RoslynSandbox
{
internal class C
{
private readonly int value;
internal C(int arg)
{
this.value = arg;
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(testCode);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("arg");
var ctor = syntaxTree.FindConstructorDeclaration("C(int arg)");
Assert.AreEqual(true, semanticModel.TryGetSymbol(value, CancellationToken.None, out var symbol));
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out AssignmentExpressionSyntax result));
Assert.AreEqual("this.value = arg", result.ToString());
using (var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None))
{
Assert.AreEqual("this.value = arg", walker.Assignments.Single().ToString());
}
}
public static void FieldWithCtorArgViaProperty(SearchScope scope)
{
var code = @"
namespace N
{
internal class C
{
private int number;
internal C(int arg)
{
this.Number = arg;
}
public int Number
{
get { return this.number; }
set { this.number = value; }
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("arg");
var ctor = syntaxTree.FindConstructorDeclaration("C(int arg)");
var symbol = semanticModel.GetDeclaredSymbolSafe(value, CancellationToken.None);
if (scope == SearchScope.Member)
{
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out var result));
Assert.AreEqual("this.Number = arg", result.ToString());
using (var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None))
{
Assert.AreEqual("this.Number = arg", string.Join(", ", walker.Assignments));
}
}
else
{
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out var result));
Assert.AreEqual("this.number = value", result.ToString());
using (var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None))
{
Assert.AreEqual("this.number = value", string.Join(", ", walker.Assignments));
}
}
}
public static void ChainedCtorArg(SearchScope scope)
{
var code = @"
namespace N
{
internal class C
{
private readonly int value;
public C(int arg)
: this(arg, 1)
{
}
internal C(int chainedArg, int _)
{
this.value = chainedArg;
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(code);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var ctor = syntaxTree.FindConstructorDeclaration("C(int arg)");
var symbol = semanticModel.GetDeclaredSymbolSafe(syntaxTree.FindParameter("arg"), CancellationToken.None);
if (scope != SearchScope.Member)
{
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out var result));
Assert.AreEqual("this.value = chainedArg", result.ToString());
using (var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None))
{
Assert.AreEqual("this.value = chainedArg", walker.Assignments.Single().ToString());
}
}
else
{
Assert.AreEqual(false, AssignmentExecutionWalker.FirstWith(symbol, ctor, scope, semanticModel, CancellationToken.None, out _));
using (var walker = AssignmentExecutionWalker.With(symbol, ctor, scope, semanticModel, CancellationToken.None))
{
Assert.AreEqual(0, walker.Assignments.Count);
}
}
}
internal static bool IsAssignedToFieldOrProperty(ISymbol symbol, SyntaxNode scope, SemanticModel semanticModel, CancellationToken cancellationToken, PooledSet <ISymbol> visited = null)
{
if (AssignmentExecutionWalker.FirstWith(symbol, scope, Scope.Instance, semanticModel, cancellationToken, out var assignment) &&
semanticModel.TryGetSymbol(assignment.Left, cancellationToken, out ISymbol left))
{
if (left.IsEither <IParameterSymbol, ILocalSymbol>())
{
using (visited = visited.IncrementUsage())
{
return(visited.Add(left) &&
IsAssignedToFieldOrProperty(left, scope, semanticModel, cancellationToken, visited));
}
}
return(left.IsEitherKind(SymbolKind.Field, SymbolKind.Property, SymbolKind.ArrayType));
}
return(false);
}
public void FieldWithCtorArgViaProperty(Search search)
{
var testCode = @"
namespace RoslynSandbox
{
internal class Foo
{
private int number;
internal Foo(int arg)
{
this.Number = arg;
}
public int Number
{
get { return this.number; }
set { this.number = value; }
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(testCode);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("arg");
var ctor = syntaxTree.FindConstructorDeclaration("Foo(int arg)");
AssignmentExpressionSyntax result;
var symbol = semanticModel.GetDeclaredSymbolSafe(value, CancellationToken.None);
if (search == Search.Recursive)
{
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, Search.Recursive, semanticModel, CancellationToken.None, out result));
Assert.AreEqual("this.Number = arg", result?.ToString());
}
else
{
Assert.AreEqual(false, AssignmentExecutionWalker.FirstForSymbol(symbol, ctor, Search.TopLevel, semanticModel, CancellationToken.None, out result));
}
}
public void ChainedCtorArg(Search search)
{
var testCode = @"
namespace RoslynSandbox
{
internal class Foo
{
private readonly int value;
public Foo(int arg)
: this(arg, 1)
{
}
internal Foo(int chainedArg, int _)
{
this.value = chainedArg;
}
}
}";
var syntaxTree = CSharpSyntaxTree.ParseText(testCode);
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var value = syntaxTree.FindParameter("arg");
var ctor = syntaxTree.FindConstructorDeclaration("Foo(int arg)");
AssignmentExpressionSyntax result;
var symbol = semanticModel.GetDeclaredSymbolSafe(value, CancellationToken.None);
if (search == Search.Recursive)
{
Assert.AreEqual(true, AssignmentExecutionWalker.FirstWith(symbol, ctor, Search.Recursive, semanticModel, CancellationToken.None, out result));
Assert.AreEqual("this.value = chainedArg", result?.ToString());
}
else
{
Assert.AreEqual(false, AssignmentExecutionWalker.FirstWith(symbol, ctor, Search.TopLevel, semanticModel, CancellationToken.None, out result));
}
}