// Filter returns a new R instance that filters the time.Time Streams
// that r creates
func Filter(r R, f functional.Filterer) R {
if nested, ok := r.(*filterR); ok {
return &filterR{
recurring: nested.recurring, filter: functional.All(nested.filter, f)}
}
return &filterR{recurring: r, filter: f}
}
func newEntryFilter(s string) functional.Filterer {
s = str_util.Normalize(s)
if s == "" {
return functional.All()
}
return entryFilter(s)
}