private static ImmutableArray <ISymbol> GetSymbolsForExpressionOrStatementContext(
CSharpSyntaxContext context,
bool filterOutOfScopeLocals,
CancellationToken cancellationToken)
{
// Check if we're in an interesting situation like this:
//
// i // <-- here
// I = 0;
// The problem is that "i I = 0" causes a local to be in scope called "I". So, later when
// we look up symbols, it masks any other 'I's in scope (i.e. if there's a field with that
// name). If this is the case, we do not want to filter out inaccessible locals.
if (filterOutOfScopeLocals)
{
if (context.LeftToken.Parent.IsFoundUnder <LocalDeclarationStatementSyntax>(d => d.Declaration.Type))
{
filterOutOfScopeLocals = false;
}
}
var symbols = !context.IsNameOfContext && context.LeftToken.Parent.IsInStaticContext()
? context.SemanticModel.LookupStaticMembers(context.LeftToken.SpanStart)
: context.SemanticModel.LookupSymbols(context.LeftToken.SpanStart);
// Filter out any extension methods that might be imported by a using static directive.
// But include extension methods declared in the context's type or it's parents
var contextEnclosingNamedType = context.SemanticModel.GetEnclosingNamedType(context.Position, cancellationToken);
var contextOuterTypes = context.GetOuterTypes(cancellationToken);
symbols = symbols.WhereAsArray(symbol =>
!symbol.IsExtensionMethod() ||
contextEnclosingNamedType.Equals(symbol.ContainingType) ||
contextOuterTypes.Any(outerType => outerType.Equals(symbol.ContainingType)));
// The symbols may include local variables that are declared later in the method and
// should not be included in the completion list, so remove those. Filter them away,
// unless we're in the debugger, where we show all locals in scope.
if (filterOutOfScopeLocals)
{
symbols = symbols.WhereAsArray(symbol => !symbol.IsInaccessibleLocal(context.Position));
}
return(symbols);
}