/// <summary>
/// Finds all members defined or referenced in <paramref name="project"/> which may have a parameter that is of or derived from <paramref name="type"/>.
/// </summary>
public static async Task <List <ISymbol> > FindInstanceAsParameterAsync(this ITypeSymbol type, Project project, CancellationToken cancellationToken = default)
{
var compilation = await project.GetCompilationAsync(cancellationToken).ConfigureAwait(false);
var members = new List <ISymbol>(10);
ImmutableArray <IParameterSymbol> parameters;
var assembly = compilation.Assembly;
foreach (var typeSymbol in compilation.GlobalNamespace.GetAllTypes(cancellationToken))
{
foreach (var member in typeSymbol.GetMembers())
{
if (cancellationToken.IsCancellationRequested)
{
return(members);
}
if (member.Kind != SymbolKind.Field &&
member.CanBeReferencedByName &&
(parameters = member.GetParameters()).IsDefaultOrEmpty == false)
{
if (parameters.Any(p => type.CanConvertTo(p.Type) && p.Type.IsCommonClass() == false) &&
type.CanAccess(member, assembly))
{
members.Add(member);
}
}
}
}
return(members);
}
/// <summary>
/// Finds all members defined or referenced in <paramref name="project"/> which may return an instance of <paramref name="type"/>.
/// </summary>
public static async Task <List <ISymbol> > FindSymbolInstanceProducerAsync(this ITypeSymbol type, Project project, bool strict, CancellationToken cancellationToken = default)
{
var compilation = await project.GetCompilationAsync(cancellationToken).ConfigureAwait(false);
var assembly = compilation.Assembly;
var members = new List <ISymbol>(10);
var paramComparer = strict
? (Func <IParameterSymbol, bool>)(p => p.Type == type && p.RefKind != RefKind.None)
: (p => p.Type.CanConvertTo(type) && p.RefKind != RefKind.None);
foreach (var typeSymbol in compilation.GlobalNamespace.GetAllTypes(cancellationToken))
{
foreach (var member in typeSymbol.GetMembers())
{
if (cancellationToken.IsCancellationRequested)
{
return(members);
}
ITypeSymbol mt;
if (member.Kind == SymbolKind.Field)
{
if (member.CanBeReferencedByName &&
(mt = member.GetReturnType()) != null && (mt == type || strict == false && mt.CanConvertTo(type) || (mt as INamedTypeSymbol).ContainsTypeArgument(type)) &&
type.CanAccess(member, assembly))
{
members.Add(member);
}
}
else if (member.CanBeReferencedByName &&
((mt = member.GetReturnType()) != null && (mt == type || strict == false && mt.CanConvertTo(type) || (mt as INamedTypeSymbol).ContainsTypeArgument(type)) ||
member.Kind == SymbolKind.Method && member.GetParameters().Any(paramComparer)) &&
type.CanAccess(member, assembly))
{
members.Add(member);
}
}
}
return(members);
}
/// <summary>
/// Finds all members defined or referenced in <paramref name="project"/> which may return an instance of <paramref name="type"/>.
/// </summary>
public static List <ISymbol> FindSymbolInstanceProducer(this ITypeSymbol type, Project project, CancellationToken cancellationToken = default(CancellationToken))
{
var compilation = project.GetCompilationAsync(cancellationToken).Result;
var assembly = compilation.Assembly;
//todo cache types
var members = new List <ISymbol>(10);
foreach (var typeSymbol in compilation.GlobalNamespace.GetAllTypes(cancellationToken))
{
foreach (var member in typeSymbol.GetMembers())
{
ITypeSymbol mt;
if (member.Kind != SymbolKind.Field &&
member.CanBeReferencedByName &&
((mt = member.GetReturnType()) != null && mt.CanConvertTo(type) ||
member.Kind == SymbolKind.Method && member.GetParameters().Any(p => p.Type.CanConvertTo(type) && p.RefKind != RefKind.None)) &&
type.CanAccess(member, assembly))
{
members.Add(member);
}
}
}
return(members);
}
/// <summary>
/// Returns whether a given type <paramref name="from"/> can access symbol <paramref name="target"/>.
/// </summary>
public static bool CanAccess(this ITypeSymbol from, ISymbol target, IAssemblySymbol assembly)
{
if (target == null)
{
return(false);
}
switch (target.DeclaredAccessibility)
{
case Accessibility.Public:
return(true && (target.ContainingType == null || from.CanAccess(target.ContainingType, assembly)));
case Accessibility.Private:
return(target.ContainingType.Equals(from) || target.FirstSourceLocation() != null);
case Accessibility.Internal:
return(target.ContainingAssembly.GivesAccessTo(assembly) &&
(target.ContainingType == null || from.CanAccess(target.ContainingType, assembly)));
case Accessibility.ProtectedOrInternal:
if (target.ContainingAssembly.GivesAccessTo(assembly))
{
return(true);
}
goto case Accessibility.Protected;
case Accessibility.Protected:
target = target.ContainingType;
if (target.ContainingType != null && from.CanAccess(target.ContainingType, assembly) == false)
{
return(false);
}
do
{
if (from.Equals(target))
{
return(true);
}
} while ((from = from.BaseType) != null);
return(false);
case Accessibility.ProtectedAndInternal:
if (target.ContainingAssembly.GivesAccessTo(assembly))
{
target = target.ContainingType;
if (target.ContainingType != null && from.CanAccess(target.ContainingType, null) == false)
{
return(false);
}
do
{
if (from.Equals(target))
{
return(true);
}
} while ((from = from.BaseType) != null);
return(false);
}
return(false);
}
return(false);
}
