/// <summary>
/// Lookup a type within the assembly using its canonical CLR metadata name.
/// </summary>
/// <param name="metadataName"></param>
/// <param name="includeReferences">
/// If search within assembly fails, lookup in assemblies referenced by the primary module.
/// For source assembly, this is equivalent to all assembly references given to compilation.
/// </param>
/// <param name="isWellKnownType">
/// Extra restrictions apply when searching for a well-known type. In particular, the type must be public.
/// </param>
/// <param name="useCLSCompliantNameArityEncoding">
/// While resolving the name, consider only types following CLS-compliant generic type names and arity encoding (ECMA-335, section 10.7.2).
/// I.e. arity is inferred from the name and matching type must have the same emitted name and arity.
/// </param>
/// <param name="warnings">
/// A diagnostic bag to receive warnings if we should allow multiple definitions and pick one.
/// </param>
/// <returns>Null if the type can't be found.</returns>
internal NamedTypeSymbol GetTypeByMetadataName(
string metadataName,
bool includeReferences,
bool isWellKnownType,
bool useCLSCompliantNameArityEncoding = false,
DiagnosticBag warnings = null)
{
NamedTypeSymbol type = null;
MetadataTypeName mdName;
if (metadataName.IndexOf('+') >= 0)
{
var parts = metadataName.Split(_nestedTypeNameSeparators);
if (parts.Length > 0)
{
mdName = MetadataTypeName.FromFullName(parts[0], useCLSCompliantNameArityEncoding);
type = GetTopLevelTypeByMetadataName(ref mdName, assemblyOpt: null, includeReferences: includeReferences, isWellKnownType: isWellKnownType, warnings: warnings);
for (int i = 1; (object)type != null && !type.IsErrorType() && i < parts.Length; i++)
{
mdName = MetadataTypeName.FromTypeName(parts[i]);
NamedTypeSymbol temp = type.LookupMetadataType(ref mdName);
type = (!isWellKnownType || IsValidWellKnownType(temp)) ? temp : null;
}
}
}
else
{
mdName = MetadataTypeName.FromFullName(metadataName, useCLSCompliantNameArityEncoding);
type = GetTopLevelTypeByMetadataName(ref mdName, assemblyOpt: null, includeReferences: includeReferences, isWellKnownType: isWellKnownType, warnings: warnings);
}
return(((object)type == null || type.IsErrorType()) ? null : type);
}
