private void Visit(UsingParametersStatement usingParametersStatement)
{
if (currentContext == null)
{
logging.Error("Unexpected 'using params' outside of shader block declaration", usingParametersStatement.Span);
return;
}
HashSet<string> usings = currentContext.DeclaredParameters;
// If this is a using params without a body, it is a simple reference of a ParameterBlock
if (usingParametersStatement.Body == null)
{
var simpleName = usingParametersStatement.Name as VariableReferenceExpression;
if (simpleName != null)
{
string typeName = simpleName.Name.Text;
if (usings.Contains(typeName))
{
logging.Error("Unexpected declaration of using params. This variable is already declared in this scope", usingParametersStatement.Span);
return;
}
usings.Add(typeName);
}
}
else
{
// using params with a body is to enter the context of the parameters passed to the using statements
VisitDynamic(usingParametersStatement.Body);
}
}
protected virtual void Visit(UsingParametersStatement usingParametersStatement)
{
if (usingParametersStatement.Body == null)
return;
Identifier parameterType;
Identifier parameterMember;
if (!TryParameters(usingParametersStatement.Name, out parameterType, out parameterMember))
{
Write(@"#error ""Unexpected parameter for 'using params' [");
VisitDynamic(usingParametersStatement.Name);
WriteLine(@"]. Expecting single property access""");
return;
}
AddPushPopParameters(usingParametersStatement.Body, parameterType, parameterMember, usingParametersStatement.Name, usingParametersStatement.Span);
Visit(usingParametersStatement.Body);
}