protected static bool TestOnlyAssigned(BaseRefactoringContext ctx, AstNode rootNode, IVariable variable)
{
var assignment = false;
var nonAssignment = false;
foreach (var result in ctx.FindReferences(rootNode, variable))
{
var node = result.Node;
if (node is ParameterDeclaration)
{
continue;
}
if (node is VariableInitializer)
{
if (!(node as VariableInitializer).Initializer.IsNull)
{
assignment = true;
}
continue;
}
if (node is IdentifierExpression)
{
var parent = node.Parent;
if (parent is AssignmentExpression)
{
if (((AssignmentExpression)parent).Left == node)
{
assignment = true;
continue;
}
}
else if (parent is UnaryOperatorExpression)
{
var op = ((UnaryOperatorExpression)parent).Operator;
switch (op)
{
case UnaryOperatorType.Increment:
case UnaryOperatorType.PostIncrement:
case UnaryOperatorType.Decrement:
case UnaryOperatorType.PostDecrement:
assignment = true;
if (!(parent.Parent is ExpressionStatement))
{
nonAssignment = true;
}
continue;
}
}
else if (parent is DirectionExpression)
{
if (((DirectionExpression)parent).FieldDirection == FieldDirection.Out)
{
assignment = true;
// Using dummy variables is necessary for ignoring
// out-arguments, so we don't want to warn for those.
nonAssignment = true;
continue;
}
}
}
nonAssignment = true;
}
return(assignment && !nonAssignment);
}