| 1 | package calendar |
| 2 | |
| 3 | import "time" |
| 4 | |
| 5 | var firstCivilDay = civilDay(time.Date(0, 1, 1, 0, 0, 0, 0, time.UTC)) |
| 6 | var lastCivilDay = civilDay(time.Date(9999, 12, 31, 0, 0, 0, 0, time.UTC)) |
| 7 | |
| 8 | func civilDay(t time.Time) int64 { return civil(t).Unix() / 86400 } |
| 9 | func inDateHorizon(t time.Time) bool { return t.Year() >= 0 && t.Year() <= 9999 } |
| 10 | |
| 11 | func candidateOnDay(day int64, proto time.Time, loc *time.Location) (time.Time, stepState) { |
| 12 | if day < firstCivilDay || day > lastCivilDay { |
| 13 | return time.Time{}, stepIncomplete |
| 14 | } |
| 15 | candidate := onDate(time.Unix(day*86400, 0).UTC(), proto, loc) |
| 16 | if !inDateHorizon(candidate) { |
| 17 | return time.Time{}, stepIncomplete |
| 18 | } |
| 19 | return candidate, stepCandidate |
| 20 | } |
| 21 | |
| 22 | func validExpansionRule(r Rule) bool { |
| 23 | if r.Count < 0 || r.Count > 0 && r.HasUntil { |
| 24 | return false |
| 25 | } |
| 26 | if r.HasUntil && !inDateHorizon(r.Until) { |
| 27 | return false |
| 28 | } |
| 29 | if r.Freq == "" { |
| 30 | return len(r.ByDay) == 0 && r.Ordinal == 0 && r.MonthDay == 0 |
| 31 | } |
| 32 | if r.Interval < 1 { |
| 33 | return false |
| 34 | } |
| 35 | switch r.Freq { |
| 36 | case FreqWeekly: |
| 37 | if r.WeekStart < time.Sunday || r.WeekStart > time.Saturday || r.MonthDay != 0 || r.Ordinal != 0 { |
| 38 | return false |
| 39 | } |
| 40 | for _, day := range r.ByDay { |
| 41 | if day < time.Sunday || day > time.Saturday { |
| 42 | return false |
| 43 | } |
| 44 | } |
| 45 | case FreqMonthly: |
| 46 | if len(r.ByDay) != 0 || r.MonthDay < 0 || r.MonthDay > 31 || r.Ordinal != 0 && (r.MonthDay != 0 || r.OrdinalDay < time.Sunday || r.OrdinalDay > time.Saturday) { |
| 47 | return false |
| 48 | } |
| 49 | case FreqDaily, FreqYearly: |
| 50 | if len(r.ByDay) != 0 || r.MonthDay != 0 || r.Ordinal != 0 { |
| 51 | return false |
| 52 | } |
| 53 | default: |
| 54 | return false |
| 55 | } |
| 56 | return true |
| 57 | } |
| 58 | |
amadan