internal static bool TryGet(ExpressionSyntax expression, SyntaxNodeAnalysisContext context, out MethodInfo methodInfo)
{
switch (expression)
{
case InvocationExpressionSyntax invocation when GetX.TryMatchGetMethod(invocation, context, out var member, out _, out _, out _) && member.Symbol is IMethodSymbol method:
methodInfo = new MethodInfo(member.ReflectedType, method);
return(true);
case InvocationExpressionSyntax invocation when invocation.Expression is MemberAccessExpressionSyntax memberAccess &&
context.SemanticModel.TryGetSymbol(invocation, KnownSymbol.PropertyInfo.GetGetMethod, context.CancellationToken, out _) &&
PropertyInfo.TryGet(memberAccess.Expression, context, out var propertyInfo) &&
propertyInfo.Property.GetMethod is IMethodSymbol getMethod:
methodInfo = new MethodInfo(propertyInfo.ReflectedType, getMethod);
return(true);
case InvocationExpressionSyntax invocation when invocation.Expression is MemberAccessExpressionSyntax memberAccess &&
context.SemanticModel.TryGetSymbol(invocation, KnownSymbol.PropertyInfo.GetSetMethod, context.CancellationToken, out _) &&
PropertyInfo.TryGet(memberAccess.Expression, context, out var propertyInfo) &&
propertyInfo.Property.SetMethod is IMethodSymbol setMethod:
methodInfo = new MethodInfo(propertyInfo.ReflectedType, setMethod);
return(true);
case MemberAccessExpressionSyntax memberAccess when context.SemanticModel.TryGetSymbol(memberAccess, context.CancellationToken, out ISymbol symbol):
if (symbol == KnownSymbol.PropertyInfo.GetMethod &&
PropertyInfo.TryGet(memberAccess.Expression, context, out var property))
{
methodInfo = new MethodInfo(property.ReflectedType, property.Property.GetMethod);
return(true);
}
if (symbol == KnownSymbol.PropertyInfo.SetMethod &&
PropertyInfo.TryGet(memberAccess.Expression, context, out property))
{
methodInfo = new MethodInfo(property.ReflectedType, property.Property.SetMethod);
return(true);
}
break;
}
if (expression.IsEither(SyntaxKind.IdentifierName, SyntaxKind.SimpleMemberAccessExpression) &&
context.SemanticModel.TryGetSymbol(expression, context.CancellationToken, out ISymbol local))
{
methodInfo = default(MethodInfo);
return(AssignedValue.TryGetSingle(local, context.SemanticModel, context.CancellationToken, out var assignedValue) &&
TryGet(assignedValue, context, out methodInfo));
}
methodInfo = default(MethodInfo);
return(false);
}
private static bool TryGetX(SyntaxNodeAnalysisContext context, out ReflectedMember member, out Name name, out Flags flags, out Types types)
{
name = default(Name);
if (context.Node is InvocationExpressionSyntax candidate)
{
return(GetX.TryMatchGetConstructor(candidate, context, out member, out flags, out types) ||
GetX.TryMatchGetEvent(candidate, context, out member, out name, out flags) ||
GetX.TryMatchGetField(candidate, context, out member, out name, out flags) ||
GetX.TryMatchGetMethod(candidate, context, out member, out name, out flags, out types) ||
GetX.TryMatchGetNestedType(candidate, context, out member, out name, out flags) ||
GetX.TryMatchGetProperty(candidate, context, out member, out name, out flags, out types));
}
member = default(ReflectedMember);
flags = default(Flags);
types = default(Types);
return(false);
}
private static bool TryGet(ExpressionSyntax expression, SyntaxNodeAnalysisContext context, PooledSet <ExpressionSyntax> visited, out ITypeSymbol result, out ExpressionSyntax source)
{
switch (expression)
{
case MemberAccessExpressionSyntax memberAccess when memberAccess.Name.Identifier.ValueText == "ReturnType" &&
memberAccess.Expression is InvocationExpressionSyntax invocation &&
GetX.TryMatchGetMethod(invocation, context, out var reflectedMember, out _, out _, out _) &&
reflectedMember.Match == FilterMatch.Single &&
reflectedMember.Symbol is IMethodSymbol method:
source = memberAccess;
result = method.ReturnType;
return(true);
case MemberAccessExpressionSyntax memberAccess when memberAccess.Name.Identifier.ValueText == "FieldType" &&
memberAccess.Expression is InvocationExpressionSyntax invocation &&
GetX.TryMatchGetField(invocation, context, out var reflectedMember, out _, out _) &&
reflectedMember.Match == FilterMatch.Single &&
reflectedMember.Symbol is IFieldSymbol field:
source = memberAccess;
result = field.Type;
return(true);
case MemberAccessExpressionSyntax memberAccess when memberAccess.Name.Identifier.ValueText == "PropertyType" &&
memberAccess.Expression is InvocationExpressionSyntax invocation &&
GetX.TryMatchGetProperty(invocation, context, out var reflectedMember, out _, out _, out _) &&
reflectedMember.Match == FilterMatch.Single &&
reflectedMember.Symbol is IPropertySymbol field:
source = memberAccess;
result = field.Type;
return(true);
case TypeOfExpressionSyntax typeOf:
source = typeOf;
return(context.SemanticModel.TryGetType(typeOf.Type, context.CancellationToken, out result));
case InvocationExpressionSyntax invocation when invocation.ArgumentList is ArgumentListSyntax args &&
args.Arguments.Count == 0 &&
invocation.TryGetMethodName(out var name) &&
name == "GetType":
switch (invocation.Expression)
{
case MemberAccessExpressionSyntax typeAccess:
source = invocation;
if (context.SemanticModel.TryGetType(typeAccess.Expression, context.CancellationToken, out result))
{
if (result is INamedTypeSymbol namedType &&
namedType.ConstructedFrom?.SpecialType == SpecialType.System_Nullable_T)
{
result = namedType.TypeArguments[0];
}
return(true);
}
return(false);
case IdentifierNameSyntax _ when expression.TryFirstAncestor(out TypeDeclarationSyntax containingType):
source = invocation;
return(context.SemanticModel.TryGetSymbol(containingType, context.CancellationToken, out result));
case MemberBindingExpressionSyntax memberBinding when memberBinding.Parent?.Parent is ConditionalAccessExpressionSyntax conditionalAccess:
source = invocation;
return(context.SemanticModel.TryGetType(conditionalAccess.Expression, context.CancellationToken, out result));
}
break;
case InvocationExpressionSyntax candidate when TryMatchTypeGetType(candidate, context, out var typeName, out var ignoreCase):
source = candidate;
result = context.Compilation.GetTypeByMetadataName(typeName, ignoreCase.Value);
return(result != null);
case InvocationExpressionSyntax candidate when TryMatchAssemblyGetType(candidate, context, out var typeName, out var ignoreCase):
source = candidate;
result = Assembly.TryGet(candidate.Expression, context, out var assembly)
? assembly.GetTypeByMetadataName(typeName, ignoreCase.Value)
: null;
return(result != null);
case InvocationExpressionSyntax invocation when invocation.TryGetTarget(KnownSymbol.Type.GetGenericTypeDefinition, context.SemanticModel, context.CancellationToken, out _) &&
invocation.Expression is MemberAccessExpressionSyntax memberAccess &&
TryGet(memberAccess.Expression, context, visited, out var definingType, out _) &&
definingType is INamedTypeSymbol namedType:
source = invocation;
result = namedType.ConstructedFrom;
return(true);
case InvocationExpressionSyntax invocation when GetX.TryMatchGetNestedType(invocation, context, out var reflectedMember, out _, out _):
source = invocation;
result = reflectedMember.Symbol as ITypeSymbol;
return(result != null && reflectedMember.Match == FilterMatch.Single);
case InvocationExpressionSyntax invocation when invocation.TryGetTarget(KnownSymbol.Type.MakeGenericType, context.SemanticModel, context.CancellationToken, out _) &&
invocation.Expression is MemberAccessExpressionSyntax memberAccess &&
TypeArguments.TryCreate(invocation, context, out var typeArguments) &&
typeArguments.TryGetArgumentsTypes(context, out var types):
#pragma warning disable IDISP003 // Dispose previous before re-assigning.
using (visited = visited.IncrementUsage())
#pragma warning restore IDISP003 // Dispose previous before re-assigning.
{
if (visited.Add(invocation) &&
TryGet(memberAccess.Expression, context, visited, out var definition, out _) &&
definition is INamedTypeSymbol namedType)
{
source = invocation;
result = namedType.Construct(types);
return(result != null);
}
}
break;
case ConditionalAccessExpressionSyntax conditionalAccess:
source = conditionalAccess;
return(TryGet(conditionalAccess.WhenNotNull, context, out result, out _));
}
if (expression.IsEither(SyntaxKind.IdentifierName, SyntaxKind.SimpleMemberAccessExpression) &&
context.SemanticModel.TryGetSymbol(expression, context.CancellationToken, out ISymbol local))
{
#pragma warning disable IDISP003 // Dispose previous before re-assigning.
using (visited = visited.IncrementUsage())
#pragma warning restore IDISP003 // Dispose previous before re-assigning.
{
source = null;
result = null;
return(AssignedValue.TryGetSingle(local, context.SemanticModel, context.CancellationToken, out var assignedValue) &&
visited.Add(assignedValue) &&
TryGet(assignedValue, context, visited, out result, out source));
}
}
source = null;
result = null;
return(false);
}