public override State Build(FSMRepresentationBuilder fb)
{
// SuperSub states depend upon other states, and so must request
// that they be built first. Also, they are depended upon by other
// states, so they must ignore duplicate requests for being built.
State retval = null;
if (!fb.IsStateBuilt(this.StateName))
{
var sr = fb.GetStateRep(this.SuperStateName);
if (sr != null)
{
sr.Build(fb);
var superState = fb.GetBuiltSuperState(this.SuperStateName);
if (superState != null)
{
var s = new SuperSubStateImpl(this.StateName, superState);
retval = s;
fb.AddBuiltSuperState(s);
}
else
{
var e = "Could not build super sub state (" + this.StateName + ") because super state (" + this.SuperStateName + ") had an error.";
fb.SetError();
fb.Error(sr.SyntaxLocation, e);
}
}
else
{
var e = $"Super state ({this.SuperStateName}) was not declared.";
fb.SetError();
fb.Error(sr.SyntaxLocation, e);
}
}
else
{
retval = fb.GetBuiltState(this.StateName);
}
return(retval);
}