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Readme.md
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13
Readme.md
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This is little library to operate with bank holidays in Poland.
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```go
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holidays := holidays_pl.New()
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// to get list of all holidays
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holidays.GetHolidaysList(d.Year())
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// get holiday by date or false as second returned value
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hh, ok := holidays.GetByDate(time.Date(2024, time.March, 31, 0, 0, 0, 0, time.UTC))
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```
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For more info just look at th tests file.
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170
holidays.go
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170
holidays.go
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package holidayspl
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import (
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"time"
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)
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type Holidays struct {
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list []Holiday
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cache map[int][]Holiday
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}
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func New() *Holidays {
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return &Holidays{
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list: createList(),
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cache: make(map[int][]Holiday),
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}
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}
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func (hol *Holidays) GetEasterDate(year int) time.Time {
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a := year % 19
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b := year / 100
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c := year % 100
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d := b / 4
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e := b % 4
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f := (b + 8) / 25
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g := (b - f + 1) / 3
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h := (19*a + b - d - g + 15) % 30
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i := c / 4
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k := c % 4
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l := (32 + 2*e + 2*i - h - k) % 7
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m := (a + 11*h + 22*l) / 451
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n := (h + l - 7*m + 114) / 31
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o := (h + l - 7*m + 114) % 31
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return time.Date(year, time.Month(n), o+1, 0, 0, 0, 0, time.UTC)
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}
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func (hol *Holidays) GetHolidaysList(year int) []Holiday {
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// Check if the holiday list for this year is already cached
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if holidays, ok := hol.cache[year]; ok {
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return holidays
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}
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// Calculate and store holidays in the cache
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easter := hol.GetEasterDate(year)
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for i, h := range hol.list {
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if h.HolidayType == FIXED {
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hol.list[i].Date = time.Date(year, h.Month, h.Day, 0, 0, 0, 0, time.UTC)
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} else if h.HolidayType == MOVABLE {
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hol.list[i].Date = easter.AddDate(0, 0, h.PlusEaster)
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}
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}
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// Cache the computed holiday list
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hol.cache[year] = hol.list
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return hol.list
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}
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func (hol *Holidays) GetByDate(d time.Time) (Holiday, bool) {
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for _, h := range hol.GetHolidaysList(d.Year()) {
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if h.Date.Equal(d) {
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return h, true
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}
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}
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return Holiday{}, false
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}
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func (hol *Holidays) GetCache() map[int][]Holiday {
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return hol.cache
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}
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func createList() []Holiday {
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return []Holiday{
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{
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Name: "New Year",
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NamePL: "Nowy Rok",
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Month: time.Month(1),
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Day: 1,
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HolidayType: FIXED,
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},
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{
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Name: "Three Kings' Day",
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NamePL: "Święto Trzech Króli",
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Month: time.Month(1),
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Day: 6,
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HolidayType: FIXED,
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},
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{
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Name: "Labour Day",
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NamePL: "Święto Pracy",
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Month: time.Month(5),
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Day: 1,
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HolidayType: FIXED,
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},
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{
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Name: "3 May Constitution Day",
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NamePL: "Narodowe Święto Konstytucji Trzeciego Maja",
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Month: time.Month(5),
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Day: 3,
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HolidayType: FIXED,
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},
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{
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Name: "Assumption of Mary",
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NamePL: "Wniebowzięcie Najświętszej Maryi Panny",
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Month: time.Month(8),
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Day: 15,
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HolidayType: FIXED,
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},
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{
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Name: "All Saints' Day",
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NamePL: "Wszystkich Świętych",
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Month: time.Month(11),
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Day: 1,
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HolidayType: FIXED,
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},
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{
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Name: "National Independence Day",
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NamePL: "Narodowe Święto Niepodległości",
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Month: time.Month(11),
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Day: 11,
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HolidayType: FIXED,
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},
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{
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Name: "Christmas",
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NamePL: "Boże Narodzenie",
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Month: time.Month(12),
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Day: 25,
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HolidayType: FIXED,
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},
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{
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Name: "Second Day of Christmas",
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NamePL: "Boże Narodzenie - drugi dzień",
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Month: time.Month(12),
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Day: 26,
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HolidayType: FIXED,
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},
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{
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Name: "Easter Sunday",
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NamePL: "Niedziela Wielkanocna",
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Month: time.Month(5),
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Day: 3,
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HolidayType: MOVABLE,
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PlusEaster: 0,
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},
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{
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Name: "Easter Monday",
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NamePL: "Poniedziałek Wielkanocny",
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Month: time.Month(5),
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Day: 3,
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HolidayType: MOVABLE,
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PlusEaster: 1,
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},
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{
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Name: "Green Week",
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NamePL: "Zielone Świątki",
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Month: time.Month(5),
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Day: 3,
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HolidayType: MOVABLE,
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PlusEaster: 49,
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},
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{
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Name: "Feast of Corpus Christi",
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NamePL: "Boże Ciało",
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Month: time.Month(5),
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Day: 3,
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HolidayType: MOVABLE,
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PlusEaster: 60,
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},
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}
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}
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69
holidays_test.go
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69
holidays_test.go
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package holidayspl_test
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import (
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"testing"
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"time"
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"git.ma-al.com/goc_marek/holidayspl"
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)
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func TestGetEasterDate(t *testing.T) {
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holidays := holidayspl.New()
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tests := []struct {
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year int
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expected time.Time
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}{
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{2024, time.Date(2024, time.March, 31, 0, 0, 0, 0, time.UTC)},
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{2025, time.Date(2025, time.April, 20, 0, 0, 0, 0, time.UTC)},
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{2026, time.Date(2026, time.April, 5, 0, 0, 0, 0, time.UTC)},
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}
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for _, test := range tests {
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result := holidays.GetEasterDate(test.year)
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if !result.Equal(test.expected) {
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t.Errorf("GetEasterDate(%d) = %v; want %v", test.year, result, test.expected)
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}
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}
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}
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func TestGetByDate(t *testing.T) {
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holidays := holidayspl.New()
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tests := []struct {
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date time.Time
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expected string
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found bool
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}{
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{time.Date(2024, time.January, 1, 0, 0, 0, 0, time.UTC), "New Year", true},
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{time.Date(2024, time.March, 31, 0, 0, 0, 0, time.UTC), "Easter Sunday", true},
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{time.Date(2024, time.December, 25, 0, 0, 0, 0, time.UTC), "Christmas", true},
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{time.Date(2024, time.August, 15, 0, 0, 0, 0, time.UTC), "Assumption of Mary", true},
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{time.Date(2024, time.July, 4, 0, 0, 0, 0, time.UTC), "", false}, // No holiday on this date
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}
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for _, test := range tests {
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result, found := holidays.GetByDate(test.date)
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if found != test.found {
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t.Errorf("GetByDate(%v) = %v; want %v", test.date, found, test.found)
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}
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if found && result.Name != test.expected {
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t.Errorf("GetByDate(%v) = %v; want %v", test.date, result.Name, test.expected)
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}
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}
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}
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func TestCaching(t *testing.T) {
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holidays := holidayspl.New()
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year := 2024
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// First call should calculate and cache holidays for the year
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holidays.GetHolidaysList(year)
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// Modify the cache and see if the function returns the cached value
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holidays.GetCache()[year][0].Name = "Modified New Year"
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result := holidays.GetHolidaysList(year)
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if result[0].Name != "Modified New Year" {
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t.Errorf("Caching not working properly. Got %v, expected %v", result[0].Name, "Modified New Year")
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}
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}
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24
models.go
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24
models.go
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@ -0,0 +1,24 @@
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package holidayspl
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import "time"
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type HolidayType int
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const (
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FIXED HolidayType = iota
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MOVABLE
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)
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func (d HolidayType) String() string {
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return [...]string{"fixed", "movable"}[d]
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}
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type Holiday struct {
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Name string
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NamePL string
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Month time.Month
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Day int
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HolidayType HolidayType
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PlusEaster int
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Date time.Time
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}
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