private static TransitionConditionExpr Translate(this exprItem item, AutomatonParsingContext ctx)
{
TransitionConditionExpr expr;
if (item.identifier != null)
{
expr = new TransitionConditionExpr.VarExpr(ctx.Unescape(item.identifier.@string));
}
else if (item.exprGroup != null)
{
expr = item.exprGroup.exprSeq.TranslateToConditionExpr(ctx);
}
else if (item.literal != null)
{
expr = new TransitionConditionExpr.ConstExpr(true);
}
else
{
throw new NotImplementedException();
}
if (item.not != null)
{
expr = new TransitionConditionExpr.NotExpr(expr);
}
return(expr);
}
bool ITransitionConditionExprVisitor <bool> .VisitNot(TransitionConditionExpr.NotExpr not)
{
return(false);
}
VarsCollector ITransitionConditionExprVisitor <VarsCollector> .VisitNot(TransitionConditionExpr.NotExpr not)
{
throw new InvalidOperationException();
}
bool ITransitionConditionExprVisitor <bool> .VisitNot(TransitionConditionExpr.NotExpr not)
{
return(!not.Child.Apply(this));
}