/// <summary>
/// Visits an assignment of a TestSet
/// </summary>
/// <param name="plan">Test file plan</param>
/// <param name="testSetPlan">TestSetPlan to visit</param>
/// <param name="asgn">Assignment syntax node</param>
/// <returns>Assignment plan</returns>
private AssignmentPlanBase VisitAssignment(TestFilePlan plan, TestSetPlan testSetPlan, AssignmentNode asgn)
{
if (asgn is RegisterAssignmentNode regAsgn)
{
var value = Eval(plan, testSetPlan, regAsgn.Expr);
return(value != null
? new RegisterAssignmentPlan(regAsgn.RegisterName, value.AsWord())
: null);
}
if (asgn is FlagAssignmentNode flagAsgn)
{
return(new FlagAssignmentPlan(flagAsgn.FlagName));
}
if (asgn is MemoryAssignmentNode memAsgn)
{
var address = Eval(plan, testSetPlan, memAsgn.Address);
var value = Eval(plan, testSetPlan, memAsgn.Value);
if (address == null || value == null)
{
return(null);
}
ExpressionValue length = null;
if (memAsgn.Length != null)
{
length = Eval(plan, testSetPlan, memAsgn.Length);
if (length == null)
{
return(null);
}
}
return(length == null
? new MemoryAssignmentPlan(address.AsWord(), value.AsByteArray())
: new MemoryAssignmentPlan(address.AsWord(), value.AsByteArray().Take(length.AsWord()).ToArray()));
}
return(null);
}