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feat(Event): Update bySetPos and byMonthDay
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This change introduces two fixes to make the repeating rules for bySetPos and byMonthDay consistent with the iCalendar spec.

- bySetPos is now allowed to be passed in as both a number or an array.
- bySetPos now allows values between -366 to -1 and 1 to 366.
- byMonthDay now allows values between -31 to -1 and 1 to 31.
- If multiple days are specified for byDay, they are all used in conjunction with bySetPos and none are discarded.

Thanks @stevenpal for this contribution.

closes #430
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@sebbo2002
sebbo2002 authored Oct 10, 2022
2 parents 767bebf + cc221aa commit b19e94b
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Showing 4 changed files with 73 additions and 18 deletions.
19 changes: 10 additions & 9 deletions src/event.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -151,7 +151,7 @@ interface ICalEventInternalRepeatingData {
byDay?: ICalWeekday[];
byMonth?: number[];
byMonthDay?: number[];
bySetPos?: number;
bySetPos?: number[];
exclude?: ICalDateTimeValue[];
startOfWeek?: ICalWeekday;
}
Expand Down Expand Up @@ -655,7 +655,7 @@ export default class ICalEvent {


this.data.repeating.byMonthDay = byMonthDayArray.map(monthDay => {
if (typeof monthDay !== 'number' || monthDay < 1 || monthDay > 31) {
if (typeof monthDay !== 'number' || monthDay < -31 || monthDay > 31 || monthDay === 0) {
throw new Error('`repeating.byMonthDay` contains invalid value `' + monthDay + '`!');
}

Expand All @@ -667,12 +667,13 @@ export default class ICalEvent {
if (!this.data.repeating.byDay) {
throw '`repeating.bySetPos` must be used along with `repeating.byDay`!';
}
if (typeof repeating.bySetPos !== 'number' || repeating.bySetPos < -1 || repeating.bySetPos > 4) {
throw '`repeating.bySetPos` contains invalid value `' + repeating.bySetPos + '`!';
}

this.data.repeating.byDay.splice(1);
this.data.repeating.bySetPos = repeating.bySetPos;
const bySetPosArray = Array.isArray(repeating.bySetPos) ? repeating.bySetPos : [repeating.bySetPos];
this.data.repeating.bySetPos = bySetPosArray.map(bySetPos => {
if (typeof bySetPos !== 'number' || bySetPos < -366 || bySetPos > 366 || bySetPos === 0) {
throw '`repeating.bySetPos` contains invalid value `' + bySetPos + '`!';
}
return bySetPos;
});
}

if (repeating.exclude) {
Expand Down Expand Up @@ -1506,7 +1507,7 @@ export default class ICalEvent {
}

if (this.data.repeating.bySetPos) {
g += ';BYSETPOS=' + this.data.repeating.bySetPos;
g += ';BYSETPOS=' + this.data.repeating.bySetPos.join(',');
}

if (this.data.repeating.startOfWeek) {
Expand Down
2 changes: 1 addition & 1 deletion src/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@ export interface ICalRepeatingOptions {
byDay?: ICalWeekday[] | ICalWeekday;
byMonth?: number[] | number;
byMonthDay?: number[] | number;
bySetPos?: number;
bySetPos?: number[] | number;
exclude?: ICalDateTimeValue[] | ICalDateTimeValue;
startOfWeek?: ICalWeekday;
}
Expand Down
66 changes: 60 additions & 6 deletions test/event.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -835,10 +835,36 @@ describe('ical-generator Event', function () {
repeating: {
freq: ICalEventRepeatingFreq.DAILY,
interval: 2,
byMonthDay: [1, 32, 15]
byMonthDay: [1, 32, -15]
}
}, new ICalCalendar());
}, /`repeating\.byMonthDay` contains invalid value `32`/);

assert.throws(function () {
new ICalEvent({
start: moment(),
end: moment(),
summary: 'test',
repeating: {
freq: ICalEventRepeatingFreq.DAILY,
interval: 2,
byMonthDay: [-1, -32, 15]
}
}, new ICalCalendar());
}, /`repeating\.byMonthDay` contains invalid value `-32`/);

assert.throws(function () {
new ICalEvent({
start: moment(),
end: moment(),
summary: 'test',
repeating: {
freq: ICalEventRepeatingFreq.DAILY,
interval: 2,
byMonthDay: [1, 0, 15]
}
}, new ICalCalendar());
}, /`repeating\.byMonthDay` contains invalid value `0`/);
});

it('setter should update repeating.byMonthDay', function () {
Expand All @@ -861,10 +887,38 @@ describe('ical-generator Event', function () {
freq: ICalEventRepeatingFreq.MONTHLY,
interval: 2,
byDay: [ICalWeekday.SU],
bySetPos: 6
bySetPos: [367]
}
}, new ICalCalendar());
}, /`repeating\.bySetPos` contains invalid value `367`/);

assert.throws(function () {
new ICalEvent({
start: moment(),
end: moment(),
summary: 'test',
repeating: {
freq: ICalEventRepeatingFreq.MONTHLY,
interval: 2,
byDay: [ICalWeekday.SU],
bySetPos: [-367]
}
}, new ICalCalendar());
}, /`repeating\.bySetPos` contains invalid value `-367`/);

assert.throws(function () {
new ICalEvent({
start: moment(),
end: moment(),
summary: 'test',
repeating: {
freq: ICalEventRepeatingFreq.MONTHLY,
interval: 2,
byDay: [ICalWeekday.SU],
bySetPos: [0]
}
}, new ICalCalendar());
}, /`repeating\.bySetPos` contains invalid value `6`/);
}, /`repeating\.bySetPos` contains invalid value `0`/);

assert.throws(function () {
new ICalEvent({
Expand All @@ -876,7 +930,7 @@ describe('ical-generator Event', function () {
interval: 2,
byDay: [ICalWeekday.SU],
// @ts-ignore
bySetPos: 'FOO'
bySetPos: ['FOO']
}
}, new ICalCalendar());
}, /`repeating\.bySetPos` contains invalid value `FOO`/);
Expand All @@ -903,13 +957,13 @@ describe('ical-generator Event', function () {
e.repeating({
freq: ICalEventRepeatingFreq.MONTHLY,
byDay: [ICalWeekday.SU],
bySetPos: 2
bySetPos: [2]
});

const result = e.repeating();
assert.ok(result && !isRRule(result) && typeof result !== 'string');
assert.strictEqual(result.byDay?.length, 1);
assert.strictEqual(result.bySetPos, 2);
assert.strictEqual(result.bySetPos?.length, 1);
});

it('should throw error when repeating.exclude is not valid', function () {
Expand Down
4 changes: 2 additions & 2 deletions test/issues.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,7 @@ describe('Issues', function () {
assert.ok(str.indexOf('RRULE:FREQ=MONTHLY;COUNT=3;INTERVAL=1;BYDAY=SU;BYSETPOS=3') > -1);
});

it('should work with repeating bySetPos by taking the first elemnt of the byDay array', function () {
it('should work with repeating bySetPos by taking all elements of the byDay array', function () {
const calendar = ical({
prodId: '//superman-industries.com//ical-generator//EN',
events: [{
Expand All @@ -79,7 +79,7 @@ describe('Issues', function () {
});

const str = calendar.toString();
assert.ok(str.indexOf('RRULE:FREQ=MONTHLY;COUNT=3;INTERVAL=1;BYDAY=MO;BYSETPOS=3') > -1);
assert.ok(str.indexOf('RRULE:FREQ=MONTHLY;COUNT=3;INTERVAL=1;BYDAY=MO,FR;BYSETPOS=3') > -1);
});
});

Expand Down

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