remove ginext/mongoext (no-dep lib)

timeext/weekcount.go

@@ -0,0 +1,72 @@
+package timeext
+
+import (
+	"time"
+)
+
+var isoWeekCountAggregate map[int]int
+
+func init() {
+	isoWeekCountAggregate = make(map[int]int)
+	for y := 1900; y <= time.Now().Year(); y++ {
+		GetAggregateIsoWeekCount(y)
+	}
+}
+
+func GetAggregateIsoWeekCount(year int) int {
+	if v, ok := isoWeekCountAggregate[year]; ok {
+		return v
+	}
+
+	if year == 1900 {
+		isoWeekCountAggregate[year] = 0
+		return 0
+	}
+
+	if year < 1900 {
+		s := 0
+		for yy := year; yy < 1900; yy++ {
+			s += GetIsoWeekCount(yy)
+		}
+		w := -s
+		isoWeekCountAggregate[year] = w
+		return w
+	}
+
+	w := GetIsoWeekCount(year)
+
+	w += GetAggregateIsoWeekCount(year - 1)
+
+	isoWeekCountAggregate[year] = w
+
+	return w
+}
+
+func GetIsoWeekCount(year int) int {
+	_, w1 := time.Date(year+0, 12, 27, 0, 0, 0, 0, TimezoneBerlin).ISOWeek()
+	_, w2 := time.Date(year+0, 12, 31, 0, 0, 0, 0, TimezoneBerlin).ISOWeek()
+	_, w3 := time.Date(year+1, 1, 4, 0, 0, 0, 0, TimezoneBerlin).ISOWeek()
+
+	w1 -= 1
+	w2 -= 1
+	w3 -= 1
+
+	w := w1
+	if w2 > w {
+		w = w2
+	}
+	if w3 > w {
+		w = w3
+	}
+
+	return w
+}
+
+func GetGlobalWeeknumber(t time.Time) int {
+	y, w := t.ISOWeek()
+	w -= 1
+	if y <= 1900 {
+		w -= 1
+	}
+	return GetAggregateIsoWeekCount(y-1) + w
+}