protected override QilNode VisitIsEmpty(QilUnary local0) {
QilNode local1 = local0[0];
if (this[XmlILOptimization.FoldNone]) {
if ( (object) ( (local1).XmlType ) == (object) XmlQueryTypeFactory.None ) {
if (AllowReplace(XmlILOptimization.FoldNone, local0)) {
return Replace(XmlILOptimization.FoldNone, local0, VisitNop(f.Nop(local1)));
}
}
}
if (this[XmlILOptimization.EliminateIsEmpty]) {
if (local1.NodeType == QilNodeType.Sequence) {
if ( (local1).Count == (0) ) {
if (AllowReplace(XmlILOptimization.EliminateIsEmpty, local0)) {
return Replace(XmlILOptimization.EliminateIsEmpty, local0, VisitTrue(f.True()));
}
}
}
}
if (this[XmlILOptimization.EliminateIsEmpty]) {
if (( !( (local1).XmlType ).MaybeEmpty ) && ( !OptimizerPatterns.Read(local1).MatchesPattern(OptimizerPatternName.MaybeSideEffects) )) {
if (AllowReplace(XmlILOptimization.EliminateIsEmpty, local0)) {
return Replace(XmlILOptimization.EliminateIsEmpty, local0, VisitFalse(f.False()));
}
}
}
if (this[XmlILOptimization.EliminateIsEmpty]) {
if ( !( (local1).XmlType ).MaybeEmpty ) {
if (AllowReplace(XmlILOptimization.EliminateIsEmpty, local0)) {
return Replace(XmlILOptimization.EliminateIsEmpty, local0, VisitLoop(f.Loop(VisitLet(f.Let(local1)), VisitFalse(f.False()))));
}
}
}
return NoReplace(local0);
}