/// <summary>
/// Initializes a new instance of the <see cref="ElementDescription"/> class.
/// </summary>
/// <param name="symbol">The roslyn symbol to wrap.</param>
protected ElementDescription(ISymbol symbol)
{
Debug.Assert(!symbol.IsImplicitlyDeclared, $"{nameof(ElementDescription)} does not support compiler generated types");
this.Symbol = symbol;
// Initialize parent element based on underlying symbol.
this.Parent = this.Symbol.ContainingSymbol switch
{
IErrorTypeSymbol e => new MissingMetadataTypeDescription(e),
INamedTypeSymbol n => new MetadataTypeDescription(n),
_ => null,
};
}
private static IEnumerable <INamedTypeSymbol> Unwrap(INamedTypeSymbol namedType)
{
yield return(namedType);
IErrorTypeSymbol errorType = namedType as IErrorTypeSymbol;
if (errorType != null)
{
foreach (var type in errorType.CandidateSymbols.OfType <INamedTypeSymbol>())
{
yield return(type);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="MetadataTypeDescription"/> class.
/// </summary>
/// <param name="symbol">The wrapped roslyn symbol.</param>
internal MetadataTypeDescription(INamedTypeSymbol symbol)
: base(symbol)
{
// This constructor can be called only for INamedTypeSymbols proper, unless it is itself a subclass.
Debug.Assert(this.GetType() != typeof(MetadataTypeDescription) || this.Symbol is INamedTypeSymbol, $"Cannot pass a symbol of type {this.Symbol.TypeKind} directly to {nameof(MetadataTypeDescription)}");
this.BaseType = this.Symbol.BaseType switch
{
IErrorTypeSymbol e => new MissingMetadataTypeDescription(e),
INamedTypeSymbol n => new MetadataTypeDescription(n),
null => null,
};
var interfaceQuery = from i in this.Symbol.Interfaces
select i switch
{
IErrorTypeSymbol e => new MissingMetadataTypeDescription(e),
INamedTypeSymbol n => new MetadataTypeDescription(n),
};
this.Interfaces = interfaceQuery.ToImmutableArray();
}
/// <summary>
/// Initializes a new instance of the <see cref="MissingMetadataTypeDescription"/> class.
/// </summary>
/// <param name="symbol">An instance of <see cref="IErrorTypeSymbol"/>.</param>
internal MissingMetadataTypeDescription(IErrorTypeSymbol symbol)
: base(symbol)
{
}
