public static IMethodSymbol OverrideMethod(
this ISyntaxFactoryService codeFactory,
IMethodSymbol overriddenMethod,
SymbolModifiers modifiers,
INamedTypeSymbol newContainingType,
Document newDocument,
CancellationToken cancellationToken)
{
// Abstract: Throw not implemented
if (overriddenMethod.IsAbstract)
{
return(CodeGenerationSymbolFactory.CreateMethodSymbol(
overriddenMethod,
accessibility: overriddenMethod.ComputeResultantAccessibility(newContainingType),
modifiers: modifiers,
statements: new[] { codeFactory.CreateThrowNotImplementStatement(newDocument.Project.GetCompilationAsync(cancellationToken).WaitAndGetResult(cancellationToken)) }));
}
else
{
// Otherwise, call the base method with the same parameters
var typeParams = overriddenMethod.GetTypeArguments();
var body = codeFactory.CreateInvocationExpression(
codeFactory.CreateMemberAccessExpression(codeFactory.CreateBaseExpression(),
typeParams.IsDefaultOrEmpty
? codeFactory.CreateIdentifierName(overriddenMethod.Name)
: codeFactory.CreateGenericName(overriddenMethod.Name, typeParams)),
codeFactory.CreateArguments(overriddenMethod.GetParameters()));
return(CodeGenerationSymbolFactory.CreateMethodSymbol(
method: overriddenMethod,
accessibility: overriddenMethod.ComputeResultantAccessibility(newContainingType),
modifiers: modifiers,
statements: ((IMethodSymbol)overriddenMethod).ReturnsVoid
? new SyntaxNode[] { codeFactory.CreateExpressionStatement(body) }
: new SyntaxNode[] { codeFactory.CreateReturnStatement(body) }));
}
}
public static IPropertySymbol OverrideProperty(
this ISyntaxFactoryService codeFactory,
IPropertySymbol overriddenProperty,
SymbolModifiers modifiers,
INamedTypeSymbol containingType,
Document document,
CancellationToken cancellationToken)
{
var getAccessibility = overriddenProperty.GetMethod.ComputeResultantAccessibility(containingType);
var setAccessibility = overriddenProperty.SetMethod.ComputeResultantAccessibility(containingType);
SyntaxNode getBody = null;
SyntaxNode setBody = null;
// Implement an abstract property by throwing not implemented in accessors.
if (overriddenProperty.IsAbstract)
{
getBody = codeFactory.CreateThrowNotImplementStatement(document.Project.GetCompilationAsync(cancellationToken).WaitAndGetResult(cancellationToken));
setBody = getBody;
}
else if (overriddenProperty.IsIndexer() && document.Project.Language == LanguageNames.CSharp)
{
// Indexer: return or set base[]. Only in C#, since VB must refer to these by name.
getBody = codeFactory.CreateReturnStatement(
codeFactory.CreateElementAccessExpression(
codeFactory.CreateBaseExpression(),
codeFactory.CreateArguments(overriddenProperty.Parameters)));
setBody = codeFactory.CreateExpressionStatement(
codeFactory.CreateAssignExpression(
codeFactory.CreateElementAccessExpression(
codeFactory.CreateBaseExpression(),
codeFactory.CreateArguments(overriddenProperty.Parameters)),
codeFactory.CreateIdentifierName("value")));
}
else if (overriddenProperty.GetParameters().Any())
{
// Call accessors directly if C# overriding VB
if (document.Project.Language == LanguageNames.CSharp &&
SymbolFinder.FindSourceDefinitionAsync(overriddenProperty, document.Project.Solution)
.WaitAndGetResult(CancellationToken.None).Language == LanguageNames.VisualBasic)
{
var getName = overriddenProperty.GetMethod != null ? overriddenProperty.GetMethod.Name : null;
var setName = overriddenProperty.SetMethod != null ? overriddenProperty.SetMethod.Name : null;
getBody = getName == null
? null
: codeFactory.CreateReturnStatement(
codeFactory.CreateInvocationExpression(
codeFactory.CreateMemberAccessExpression(
codeFactory.CreateBaseExpression(),
codeFactory.CreateIdentifierName(getName)),
codeFactory.CreateArguments(overriddenProperty.Parameters)));
setBody = setName == null
? null
: codeFactory.CreateExpressionStatement(
codeFactory.CreateInvocationExpression(
codeFactory.CreateMemberAccessExpression(
codeFactory.CreateBaseExpression(),
codeFactory.CreateIdentifierName(setName)),
codeFactory.CreateArguments(overriddenProperty.SetMethod.GetParameters())));
}
else
{
getBody = codeFactory.CreateReturnStatement(
codeFactory.CreateInvocationExpression(
codeFactory.CreateMemberAccessExpression(
codeFactory.CreateBaseExpression(),
codeFactory.CreateIdentifierName(overriddenProperty.Name)), codeFactory.CreateArguments(overriddenProperty.Parameters)));
setBody = codeFactory.CreateExpressionStatement(
codeFactory.CreateAssignExpression(
codeFactory.CreateInvocationExpression(
codeFactory.CreateMemberAccessExpression(
codeFactory.CreateBaseExpression(),
codeFactory.CreateIdentifierName(overriddenProperty.Name)), codeFactory.CreateArguments(overriddenProperty.Parameters)),
codeFactory.CreateIdentifierName("value")));
}
}
else
{
// Regular property: return or set the base property
getBody = codeFactory.CreateReturnStatement(
codeFactory.CreateMemberAccessExpression(
codeFactory.CreateBaseExpression(),
codeFactory.CreateIdentifierName(overriddenProperty.Name)));
setBody = codeFactory.CreateExpressionStatement(
codeFactory.CreateAssignExpression(
codeFactory.CreateMemberAccessExpression(
codeFactory.CreateBaseExpression(),
codeFactory.CreateIdentifierName(overriddenProperty.Name)),
codeFactory.CreateIdentifierName("value")));
}
// Only generate a getter if the base getter is accessible.
IMethodSymbol accessorGet = null;
if (overriddenProperty.GetMethod != null && overriddenProperty.GetMethod.IsAccessibleWithin(containingType))
{
accessorGet = CodeGenerationSymbolFactory.CreateMethodSymbol(
overriddenProperty.GetMethod,
accessibility: getAccessibility,
statements: new[] { getBody },
modifiers: modifiers);
}
// Only generate a setter if the base setter is accessible.
IMethodSymbol accessorSet = null;
if (overriddenProperty.SetMethod != null &&
overriddenProperty.SetMethod.IsAccessibleWithin(containingType) &&
overriddenProperty.SetMethod.DeclaredAccessibility != Accessibility.Private)
{
accessorSet = CodeGenerationSymbolFactory.CreateMethodSymbol(
overriddenProperty.SetMethod,
accessibility: setAccessibility,
statements: new[] { setBody },
modifiers: modifiers);
}
return(CodeGenerationSymbolFactory.CreatePropertySymbol(
overriddenProperty,
accessibility: overriddenProperty.ComputeResultantAccessibility(containingType),
modifiers: modifiers,
name: overriddenProperty.Name,
isIndexer: overriddenProperty.IsIndexer(),
getMethod: accessorGet,
setMethod: accessorSet));
}