Added inclusive / exclusive functionality

inclusives.go

@@ -0,0 +1,37 @@
+package interval
+
+func (intvls *intervals) getInclusives(intervalLow, intervalHigh int) (int, int) {
+	low := intvls.getInclusiveLow(intervalLow)
+	high := intvls.getInclusiveHigh(intervalHigh)
+	if high < low {
+		high = low
+	}
+	if low > high {
+		low = high
+	}
+	return low, high
+}
+
+func (intvls *intervals) getInclusiveLow(value int) int {
+	if intvls.LowInclusive {
+		return value
+	}
+	// here the low is exclusive, we have to take the next value
+	newLow := value + 1
+	if newLow > intvls.MaxHigh {
+		return intvls.MaxHigh
+	}
+	return newLow
+}
+
+func (intvls *intervals) getInclusiveHigh(value int) int {
+	if intvls.HighInclusive {
+		return value
+	}
+	// here the high is exclusive, we have to take the previous value
+	newHigh := value - 1
+	if newHigh < intvls.MinLow {
+		return intvls.MinLow
+	}
+	return newHigh
+}