private static ISet <ISymbol> GetAssignedMemberSymbols(IList <MemberUsage> memberUsages)
{
var assignedMembers = new HashSet <ISymbol>();
foreach (var memberUsage in memberUsages)
{
ExpressionSyntax node = memberUsage.SyntaxNode;
var memberSymbol = memberUsage.Symbol;
// Handle "expr.FieldName"
if (node.Parent is MemberAccessExpressionSyntax simpleMemberAccess &&
simpleMemberAccess.Name == node)
{
node = simpleMemberAccess;
}
// Handle "((expr.FieldName))"
node = node.GetSelfOrTopParenthesizedExpression();
if (IsValueType(memberSymbol))
{
// Handle (((exp.FieldName)).Member1).Member2
var parentMemberAccess = node.Parent as MemberAccessExpressionSyntax;
while (IsParentMemberAccess(parentMemberAccess, node))
{
node = parentMemberAccess.GetSelfOrTopParenthesizedExpression();
parentMemberAccess = node.Parent as MemberAccessExpressionSyntax;
}
node = node.GetSelfOrTopParenthesizedExpression();
}
var parentNode = node.Parent;
if (PreOrPostfixOpSyntaxKinds.Contains(parentNode.Kind()))
{
assignedMembers.Add(memberSymbol);
continue;
}
if (parentNode is AssignmentExpressionSyntax assignment)
{
if (assignment.Left == node)
{
assignedMembers.Add(memberSymbol);
}
continue;
}
if (parentNode is ArgumentSyntax argument &&
(!argument.RefOrOutKeyword.IsKind(SyntaxKind.None) || TupleExpressionSyntaxWrapper.IsInstance(argument.Parent)))
{
assignedMembers.Add(memberSymbol);
}
}
return(assignedMembers);
}
public void TestIsInstance()
{
Assert.False(TupleExpressionSyntaxWrapper.IsInstance(null));
Assert.False(TupleExpressionSyntaxWrapper.IsInstance(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression)));
var syntaxNode = this.CreateTupleExpression();
Assert.True(TupleExpressionSyntaxWrapper.IsInstance(syntaxNode));
}
static int GetTupleCount(ExpressionSyntax assignmentLeft)
{
var result = 0;
if (TupleExpressionSyntaxWrapper.IsInstance(assignmentLeft))
{
result = ((TupleExpressionSyntaxWrapper)assignmentLeft).Arguments.Count;
}
else if (DeclarationExpressionSyntaxWrapper.IsInstance(assignmentLeft) &&
(DeclarationExpressionSyntaxWrapper)assignmentLeft is { } leftDeclaration &&
ParenthesizedVariableDesignationSyntaxWrapper.IsInstance(leftDeclaration.Designation))
{
result = ((ParenthesizedVariableDesignationSyntaxWrapper)leftDeclaration.Designation).Variables.Count;
}
return(result);
}
public void TestIsInstance()
{
Assert.False(TupleExpressionSyntaxWrapper.IsInstance(null));
Assert.False(TupleExpressionSyntaxWrapper.IsInstance(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression)));
}
