protected override void DefaultVisit(JsNode node)
{
if (node is JsExpression expression && node.HasAnnotation <ResultIsObservableAnnotation>() && !node.Parent.HasAnnotation <ObservableUnwrapInvocationAnnotation>() && !(node.Role == JsAssignmentExpression.LeftRole && node.Parent is JsAssignmentExpression) && node.Parent != null)
{
if (!AllowObservableResult || !node.IsRootResultExpression())
{
// may be null is copied to the observable result
node.ReplaceWith(_ => KoUnwrap(expression, expression, false));
node.RemoveAnnotations <MayBeNullAnnotation>();
}
}
base.DefaultVisit(node);
}
protected override void DefaultVisit(JsNode node)
{
if (node is JsExpression expression && IsObservableResult(node) && !node.Parent.HasAnnotation <ObservableUnwrapInvocationAnnotation>() && !(node.Role == JsAssignmentExpression.LeftRole && node.Parent is JsAssignmentExpression) && node.Parent != null)
{
if (ShouldUnwrap(node))
{
// may be null is copied to the observable result
node.ReplaceWith(_ => KoUnwrap(expression, expression, !node.HasAnnotation <ResultIsObservableAnnotation>()));
node.RemoveAnnotations <MayBeNullAnnotation>();
}
else
{
// may be null means that the value in the observable may be null. Which is not unwrapped, so the annotation is removed.
node.RemoveAnnotations <MayBeNullAnnotation>();
}
}
private void HandleNode(JsNode node)
{
if (node is JsExpression expression2)
{
foreach (var transform in node.Annotations.OfType <ObservableTransformationAnnotation>())
{
node.ReplaceWith(_ => transform.TransformExpression(expression2));
}
}
if (node is JsExpression expression && IsObservableResult(node) && !node.Parent.HasAnnotation <ObservableUnwrapInvocationAnnotation>() && !(node.Role == JsAssignmentExpression.LeftRole && node.Parent is JsAssignmentExpression) && node.Parent != null)
{
if (ShouldUnwrap(node))
{
// may be null is copied to the observable result
node.ReplaceWith(_ => KoUnwrap(expression, expression, !node.HasAnnotation <ResultIsObservableAnnotation>()));
node.RemoveAnnotations <MayBeNullAnnotation>();
}
else
{
// may be null means that the value in the observable may be null. Which is not unwrapped, so the annotation is removed.
node.RemoveAnnotations <MayBeNullAnnotation>();
}
}
private bool IsObservableResult(JsNode node) => node.HasAnnotation <ResultIsObservableAnnotation>() || node.HasAnnotation <ResultMayBeObservableAnnotation>();
private bool NeedsUnwrap(JsNode node) => node.HasAnnotation <ResultIsObservableAnnotation>() || node.HasAnnotation <ResultMayBeObservableAnnotation>();