public static bool ResolveExprNames(NameContext nc, ref Expr expr)
{
if (expr == null)
{
return(false);
}
#if MAX_EXPR_DEPTH
{
Parse parse = nc.Parse;
if (Expr.CheckHeight(parse, expr.Height + nc.Parse.Height) != 0)
{
return(true);
}
parse.Height += expr.Height;
}
#endif
bool savedHasAgg = ((nc.NCFlags & NC.HasAgg) != 0);
nc.NCFlags &= ~NC.HasAgg;
Walker w = new Walker();
w.ExprCallback = ResolveExprStep;
w.SelectCallback = ResolveSelectStep;
w.Parse = nc.Parse;
w.u.NC = nc;
w.WalkExpr(expr);
#if MAX_EXPR_DEPTH
nc.Parse.Height -= expr.Height;
#endif
if (nc.Errs > 0 || w.Parse.Errs > 0)
{
E.ExprSetProperty(expr, EP.Error);
}
if ((nc.NCFlags & NC.HasAgg) != 0)
{
E.ExprSetProperty(expr, EP.Agg);
}
else if (savedHasAgg)
{
nc.NCFlags |= NC.HasAgg;
}
return(E.ExprHasProperty(expr, EP.Error));
}