diff options
Diffstat (limited to 'internal/calendar/calendar.go')
| -rw-r--r-- | internal/calendar/calendar.go | 44 |
1 files changed, 41 insertions, 3 deletions
diff --git a/internal/calendar/calendar.go b/internal/calendar/calendar.go index 98dec43..e0f5217 100644 --- a/internal/calendar/calendar.go +++ b/internal/calendar/calendar.go @@ -6,11 +6,49 @@ import ( "time" ) -// Compute returns the Ordinary Form liturgical day for date under the given -// Selection, with the ordered layer stack supplying celebrations. It is pure -// and total: any valid Gregorian date yields a LiturgicalDay. +// Compute returns the liturgical day for date under the given Selection, with +// the ordered layer stack supplying celebrations. It is pure and total: any +// valid Gregorian date yields a LiturgicalDay. Selection.Form "old" computes the +// Extraordinary Form (1962); anything else computes the Ordinary Form. func Compute(date time.Time, sel Selection, layers []Layer) LiturgicalDay { date = date.UTC().Truncate(24 * time.Hour) + if sel.Form == "old" { + return computeEF(date, sel, layers) + } + return computeOF(date, sel, layers) +} + +// computeEF computes the Extraordinary Form (1962) day. +func computeEF(date time.Time, sel Selection, layers []Layer) LiturgicalDay { + td := temporalEF(date) + merged := mergeLayers(layers) + cands := []candidate{{Cel: td.Cel, Temporal: true, Season: td.Season}} + for slug, rc := range merged { + cel := buildCelebration(slug, rc) + when, ok := celebrationDate(cel, date.Year(), sel) + if !ok { + continue + } + if sameDay(when, date) { + cands = append(cands, candidate{Cel: cel, Temporal: false, Season: td.Season}) + } + } + obs, others := pickEF(cands) + day := LiturgicalDay{ + Date: date, Season: td.Season, Week: td.Week, Weekday: date.Weekday(), + Observed: obs.Cel, Colour: colourOf(obs, td), ObservedBand: precedenceEF(obs), + } + for _, o := range others { + if o.Temporal { + continue + } + day.Others = append(day.Others, o.Cel) + } + return day +} + +// computeOF computes the Ordinary Form day. +func computeOF(date time.Time, sel Selection, layers []Layer) LiturgicalDay { td := temporal(date, sel) merged := mergeLayers(layers) |