protected override PExpr DoVisit()
{
if (!_left.IsResolved)
{
if (Expr.IsUnbound)
{
if (_withScope == null)
{
var c = Global.InternalWithObjectScope;
if (c == null)
{
_withScope = GlobalContext.WithObjectScope.None;
}
else
{
_withScope = c;
_scopeWalker = new ScopeWalker(this, c);
}
}
if (_scopeWalker != null)
{
if ((_left = _scopeWalker.Visit()).IsPendingOrSignal)
{
return(ReentrantPendingOrSignal(_left));
}
if (_left.Result == ScopeWalker.NotFound)
{
// Not found in scope: forget it and challenge the Global from now on.
_scopeWalker = null;
if ((_left = Global.Visit(this)).IsPendingOrSignal)
{
return(ReentrantPendingOrSignal(_left));
}
}
}
else if ((_left = Global.Visit(this)).IsPendingOrSignal)
{
return(ReentrantPendingOrSignal(_left));
}
}
else
{
if (IsPendingOrSignal(ref _left, Expr.Left))
{
return(ReentrantPendingOrSignal(_left));
}
}
}
if (Result != null)
{
return(new PExpr(Result));
}
Debug.Assert(!_result.IsResolved);
if ((_result = _left.Result.Visit(this)).IsPendingOrSignal)
{
return(ReentrantPendingOrSignal(_result));
}
return(ReentrantSetResult(_result.Result));
}
