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rrule.js
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/*!
* rrule.js - Library for working with recurrence rules for calendar dates.
* v1.0.0-beta
* https://github.com/jkbr/rrule
*
* Copyright 2010, Jakub Roztocil and Lars Schoning
* Licenced under the BSD licence.
* https://github.com/jkbr/rrule/blob/master/LICENCE
*
* Based on:
* python-dateutil - Extensions to the standard Python datetime module.
* Copyright (c) 2003-2011 - Gustavo Niemeyer <[email protected]>
* Copyright (c) 2012 - Tomi Pieviläinen <[email protected]>
* https://github.com/jkbr/rrule/blob/master/LICENCE
*
*/
(function(root){
var serverSide = typeof module !== 'undefined' && module.exports;
var _;
if (serverSide) {
_ = require('underscore');
} else if (!(_ = root._)) {
throw 'You need to include underscore.js for rrule to work.'
}
var getnlp = function() {
if (!getnlp._nlp) {
if (serverSide) {
// Lazy, runtime import to avoid circular refs.
getnlp._nlp = require('./nlp')
} else if (!(getnlp._nlp = root._RRuleNLP)) {
throw 'You need to include rrule/nlp.js ' +
'for fromText/toText to work.'
}
}
return getnlp._nlp;
}
//=============================================================================
// Date utilities
//=============================================================================
/**
* General date-related utilities.
* Also handles several incompatibilities between JavaScript and Python
*
*/
var dateutil = {
MONTH_DAYS: [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
/**
* Number of milliseconds of one day
*/
ONE_DAY: 1000 * 60 * 60 * 24,
/**
* @see: <http://docs.python.org/library/datetime.html#datetime.MAXYEAR>
*/
MAXYEAR: 9999,
/**
* Python uses 1-Jan-1 as the base for calculating ordinals but we don't
* want to confuse the JS engine with milliseconds > Number.MAX_NUMBER,
* therefore we use 1-Jan-1970 instead
*/
ORDINAL_BASE: new Date(1970, 0, 1),
/**
* Python: MO-SU: 0 - 6
* JS: SU-SAT 0 - 6
*/
PY_WEEKDAYS: [6, 0, 1, 2, 3, 4, 5],
/**
* py_date.timetuple()[7]
*/
getYearDay: function(date) {
var dateNoTime = new Date(
date.getFullYear(), date.getMonth(), date.getDate());
return Math.ceil(
(dateNoTime - new Date(date.getFullYear(), 0, 1))
/ dateutil.ONE_DAY) + 1;
},
isLeapYear: function(year) {
if (year instanceof Date) {
year = year.getFullYear();
}
return ((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0);
},
/**
* @return {Number} the date's timezone offset in ms
*/
tzOffset: function(date) {
return date.getTimezoneOffset() * 60 * 1000
},
/**
* @see: <http://www.mcfedries.com/JavaScript/DaysBetween.asp>
*/
daysBetween: function(date1, date2) {
// The number of milliseconds in one day
// Convert both dates to milliseconds
var date1_ms = date1.getTime() - dateutil.tzOffset(date1);
var date2_ms = date2.getTime() - dateutil.tzOffset(date2);
// Calculate the difference in milliseconds
var difference_ms = Math.abs(date1_ms - date2_ms);
// Convert back to days and return
return Math.round(difference_ms / dateutil.ONE_DAY);
},
/**
* @see: <http://docs.python.org/library/datetime.html#datetime.date.toordinal>
*/
toOrdinal: function(date) {
return dateutil.daysBetween(date, dateutil.ORDINAL_BASE);
},
/**
* @see - <http://docs.python.org/library/datetime.html#datetime.date.fromordinal>
*/
fromOrdinal: function(ordinal) {
var millisecsFromBase = ordinal * dateutil.ONE_DAY;
return new Date(dateutil.ORDINAL_BASE.getTime()
- dateutil.tzOffset(dateutil.ORDINAL_BASE)
+ millisecsFromBase
+ dateutil.tzOffset(new Date(millisecsFromBase)));
},
/**
* @see: <http://docs.python.org/library/calendar.html#calendar.monthrange>
*/
monthRange: function(year, month) {
var date = new Date(year, month, 1);
return [dateutil.getWeekday(date), dateutil.getMonthDays(date)];
},
getMonthDays: function(date) {
var month = date.getMonth();
return month == 1 && dateutil.isLeapYear(date)
? 29 : dateutil.MONTH_DAYS[month];
},
/**
* @return {Number} python-like weekday
*/
getWeekday: function(date) {
return dateutil.PY_WEEKDAYS[date.getDay()];
},
/**
* @see: <http://docs.python.org/library/datetime.html#datetime.datetime.combine>
*/
combine: function(date, time) {
time = time || date;
return new Date(
date.getFullYear(), date.getMonth(), date.getDate(),
time.getHours(), time.getMinutes(), time.getSeconds()
);
},
clone: function(date) {
var dolly = new Date(date.getTime());
dolly.setMilliseconds(0);
return dolly;
},
cloneDates: function(dates) {
var clones = [];
for (var i = 0; i < dates.length; i++) {
clones.push(dateutil.clone(dates[i]));
}
return clones;
},
/**
* Sorts an array of Date or dateutil.Time objects
*/
sort: function(dates) {
dates.sort(function(a, b){
return a.getTime() - b.getTime();
});
},
timeToUntilString: function(time) {
var date = new Date(time);
var comp, comps = [
date.getUTCFullYear(),
date.getUTCMonth() + 1,
date.getUTCDate(),
'T',
date.getUTCHours(),
date.getUTCMinutes(),
date.getUTCSeconds(),
'Z'
];
for (var i = 0; i < comps.length; i++) {
comp = comps[i];
if (!/[TZ]/.test(comp) && comp < 10) {
comps[i] = '0' + String(comp);
}
}
return comps.join('');
}
};
dateutil.Time = function(hour, minute, second) {
this.hour = hour;
this.minute = minute;
this.second = second;
};
dateutil.Time.prototype = {
getHours: function() {
return this.hour;
},
getMinutes: function() {
return this.minute;
},
getSeconds: function() {
return this.second;
},
getTime: function() {
return ((this.hour * 60 * 60)
+ (this.minute * 60)
+ this.second)
* 1000;
}
};
//=============================================================================
// Helper functions
//=============================================================================
/**
* Simplified version of python's range()
*/
var range = function(start, end) {
if (arguments.length === 1) {
end = start;
start = 0;
}
var rang = [];
for (var i = start; i < end; i++) {
rang.push(i);
}
return rang;
};
var repeat = function(value, times) {
var i = 0, array = [];
if (value instanceof Array) {
for (; i < times; i++) {
array[i] = [].concat(value);
}
} else {
for (; i < times; i++) {
array[i] = value;
}
}
return array;
};
/**
* closure/goog/math/math.js:modulo
* Copyright 2006 The Closure Library Authors.
* The % operator in JavaScript returns the remainder of a / b, but differs from
* some other languages in that the result will have the same sign as the
* dividend. For example, -1 % 8 == -1, whereas in some other languages
* (such as Python) the result would be 7. This function emulates the more
* correct modulo behavior, which is useful for certain applications such as
* calculating an offset index in a circular list.
*
* @param {number} a The dividend.
* @param {number} b The divisor.
* @return {number} a % b where the result is between 0 and b (either 0 <= x < b
* or b < x <= 0, depending on the sign of b).
*/
var pymod = function(a, b) {
var r = a % b;
// If r and b differ in sign, add b to wrap the result to the correct sign.
return (r * b < 0) ? r + b : r;
};
/**
* @see: <http://docs.python.org/library/functions.html#divmod>
*/
var divmod = function(a, b) {
return {div: Math.floor(a / b), mod: pymod(a, b)};
};
/**
* Python-like boolean
* @return {Boolean} value of an object/primitive, taking into account
* the fact that in Python an empty list's/tuple's
* boolean value is False, whereas in JS it's true
*/
var plb = function(obj) {
return (obj instanceof Array && obj.length == 0)
? false
: Boolean(obj);
};
//=============================================================================
// Date masks
//=============================================================================
// Every mask is 7 days longer to handle cross-year weekly periods.
var M366MASK = [].concat(
repeat(1, 31), repeat(2, 29), repeat(3, 31),
repeat(4, 30), repeat(5, 31), repeat(6, 30),
repeat(7, 31), repeat(8, 31), repeat(9, 30),
repeat(10, 31), repeat(11, 30), repeat(12, 31),
repeat(1, 7)
);
var M365MASK = [].concat(M366MASK);
var
M29 = range(1, 30),
M30 = range(1, 31),
M31 = range(1, 32);
var MDAY366MASK = [].concat(
M31, M29, M31,
M30, M31, M30,
M31, M31, M30,
M31, M30, M31,
M31.slice(0, 7)
);
var MDAY365MASK = [].concat(MDAY366MASK);
M29 = range(-29, 0);
M30 = range(-30, 0);
M31 = range(-31, 0);
var NMDAY366MASK = [].concat(
M31, M29, M31,
M30, M31, M30,
M31, M31, M30,
M31, M30, M31,
M31.slice(0, 7)
);
var NMDAY365MASK = [].concat(NMDAY366MASK);
var M366RANGE = [0,31,60,91,121,152,182,213,244,274,305,335,366];
var M365RANGE = [0,31,59,90,120,151,181,212,243,273,304,334,365];
var WDAYMASK = (function() {
for (var wdaymask = [], i = 0; i < 55; i++) {
wdaymask = wdaymask.concat(range(7));
}
return wdaymask;
}());
M29 = M30 = M31 = null;
M365MASK = M365MASK.slice(0, 58).concat(M365MASK.slice(59, M365MASK.length));
MDAY365MASK = MDAY365MASK.slice(0, 58).concat(MDAY365MASK.slice(59));
NMDAY365MASK = NMDAY365MASK.slice(0, 30).concat(NMDAY365MASK.slice(31));
//=============================================================================
// Weekday
//=============================================================================
var Weekday = function(weekday, n) {
if (n === 0) {
throw 'Can\'t create weekday with n == 0';
}
this.weekday = weekday;
this.n = n;
};
Weekday.prototype = {
// __call__ - Cannot call the object directly, do it through
// e.g. RRule.TH.clone(-1) instead,
clone: function(n) {
return this.n == n ? this : new Weekday(this.weekday, n);
},
// __eq__
equals: function(other) {
return this.weekday == other.weekday && this.n == other.n;
},
// __repr__
toString: function() {
var s = ['MO', 'TU', 'WE', 'TH', 'FR', 'SA', 'SU'][this.weekday];
if (this.n) {
s = (this.n > 0 ? '+' : '') + String(this.n) + s;
}
return s;
},
getJsWeekday: function() {
return this.weekday == 6 ? 0 : this.weekday + 1;
}
};
//=============================================================================
// RRule
//=============================================================================
/**
*
* @param {String} freq - one of RRule.YEARLY, RRule.MONTHLY, ...
* @param {Object?} options - see <http://labix.org/python-dateutil/#head-cf004ee9a75592797e076752b2a889c10f445418>
* @constructor
*/
var RRule = function(freq, options) {
// RFC string
this._string = null;
this._cache = {
all: false,
before: [],
after: [],
between: []
};
var defaults = {
cache: true,
dtstart: null,
interval: 1,
wkst: 0,
count: null,
until: null,
bysetpos: null,
bymonth: null,
bymonthday: null,
byyearday: null,
byweekno: null,
byweekday: null,
byhour: null,
byminute: null,
bysecond: null,
// not implemented:
byeaster: null
};
var invalid = _(options)
.chain()
.keys()
.reject(function(name){
return _.has(defaults, name)
})
.value();
if (invalid.length) {
throw 'Invalid options: ' + invalid.join(', ')
}
// used by toString()
this.origOptions = _.clone(options);
var opts;
this.freq = freq;
this.options = opts = _.extend(defaults, options);
if (opts.byeaster !== null) {
throw new Error('byeaster not implemented');
}
if (!opts.dtstart) {
opts.dtstart = new Date();
opts.dtstart.setMilliseconds(0);
}
if (opts.wkst === null) {
opts.wkst = RRule.MO.weekday;
} else if (typeof opts.wkst == 'number') {
// cool, just keep it like that
} else {
opts.wkst = opts.wkst.weekday;
}
if (opts.bysetpos !== null) {
if (typeof opts.bysetpos == 'number') {
opts.bysetpos = [opts.bysetpos];
}
for (var i = 0; i < opts.bysetpos.length; i++) {
var v = opts.bysetpos[i];
if (v == 0 || !(-366 <= v && v <= 366)) {
throw 'bysetpos must be between 1 and 366, or between -366 and -1';
}
}
}
if (!(plb(opts.byweekno) || plb(opts.byyearday)
|| plb(opts.bymonthday) || opts.byweekday !== null
|| opts.byeaster !== null))
{
switch (this.freq) {
case RRule.YEARLY:
if (!opts.bymonth) {
opts.bymonth = opts.dtstart.getMonth() + 1;
}
opts.bymonthday = opts.dtstart.getDate();
break;
case RRule.MONTHLY:
opts.bymonthday = opts.dtstart.getDate();
break;
case RRule.WEEKLY:
opts.byweekday = dateutil.getWeekday(
opts.dtstart);
break;
}
}
// bymonth
if (opts.bymonth !== null
&& !(opts.bymonth instanceof Array)) {
opts.bymonth = [opts.bymonth];
}
// byyearday
if (opts.byyearday !== null
&& !(opts.byyearday instanceof Array)) {
opts.byyearday = [opts.byyearday];
}
// bymonthday
if (opts.bymonthday === null) {
opts.bymonthday = [];
opts.bynmonthday = [];
} else if (opts.bymonthday instanceof Array) {
var bymonthday = [], bynmonthday = [];
for (i = 0; i < opts.bymonthday.length; i++) {
var v = opts.bymonthday[i];
if (v > 0) {
bymonthday.push(v);
} else if (v < 0) {
bynmonthday.push(v);
}
}
opts.bymonthday = bymonthday;
opts.bynmonthday = bynmonthday;
} else {
if (opts.bymonthday < 0) {
opts.bynmonthday = [opts.bymonthday];
opts.bymonthday = [];
} else {
opts.bynmonthday = [];
opts.bymonthday = [opts.bymonthday];
}
}
// byweekno
if (opts.byweekno !== null
&& !(opts.byweekno instanceof Array)) {
opts.byweekno = [opts.byweekno];
}
// byweekday / bynweekday
if (opts.byweekday === null) {
opts.bynweekday = null;
} else if (typeof opts.byweekday == 'number') {
opts.byweekday = [opts.byweekday];
opts.bynweekday = null;
} else if (opts.byweekday instanceof Weekday) {
if (!opts.byweekday.n || this.freq > RRule.MONTHLY) {
opts.byweekday = [opts.byweekday.weekday];
opts.bynweekday = null;
} else {
opts.bynweekday = [
[opts.byweekday.weekday,
opts.byweekday.n]
];
opts.byweekday = null;
}
} else {
var byweekday = [], bynweekday = [];
for (i = 0; i < opts.byweekday.length; i++) {
var wday = opts.byweekday[i];
if (typeof wday == 'number') {
byweekday.push(wday);
} else if (!wday.n || this.freq > RRule.MONTHLY) {
byweekday.push(wday.weekday);
} else {
bynweekday.push([wday.weekday, wday.n]);
}
}
opts.byweekday = plb(byweekday) ? byweekday : null;
opts.bynweekday = plb(bynweekday) ? bynweekday : null;
}
// byhour
if (opts.byhour === null) {
opts.byhour = (this.freq < RRule.HOURLY)
? [opts.dtstart.getHours()]
: null;
} else if (typeof opts.byhour == 'number') {
opts.byhour = [opts.byhour];
}
// byminute
if (opts.byminute === null) {
opts.byminute = (this.freq < RRule.MINUTELY)
? [opts.dtstart.getMinutes()]
: null;
} else if (typeof opts.byminute == 'number') {
opts.byminute = [opts.byminute];
}
// bysecond
if (opts.bysecond === null) {
opts.bysecond = (this.freq < RRule.SECONDLY)
? [opts.dtstart.getSeconds()]
: null;
} else if (typeof opts.bysecond == 'number') {
opts.bysecond = [opts.bysecond];
}
if (this.freq >= RRule.HOURLY) {
this.timeset = null;
} else {
this.timeset = [];
for (i = 0; i < opts.byhour.length; i++) {
var hour = opts.byhour[i];
for (var j = 0; j < opts.byminute.length; j++) {
var minute = opts.byminute[j];
for (var k = 0; k < opts.bysecond.length; k++) {
var second = opts.bysecond[k];
// python:
// datetime.time(hour, minute, second,
// tzinfo=self._tzinfo))
this.timeset.push(new dateutil.Time(hour, minute, second));
}
}
}
dateutil.sort(this.timeset);
}
};
//}}}
// RRule class 'constants'
RRule.FREQUENCIES = [
'YEARLY', 'MONTHLY', 'WEEKLY', 'DAILY',
'HOURLY', 'MINUTELY', 'SECONDLY'
];
RRule.YEARLY = 0;
RRule.MONTHLY = 1;
RRule.WEEKLY = 2;
RRule.DAILY = 3;
RRule.HOURLY = 4;
RRule.MINUTELY = 5;
RRule.SECONDLY = 6;
RRule.MO = new Weekday(0);
RRule.TU = new Weekday(1);
RRule.WE = new Weekday(2);
RRule.TH = new Weekday(3);
RRule.FR = new Weekday(4);
RRule.SA = new Weekday(5);
RRule.SU = new Weekday(6);
RRule.fromText = function(text, dtstart, language) {
return getnlp().fromText(text, dtstart, language)
}
RRule.prototype = {
/**
* @param {Function} iterator - optional function that will be called
* on each date that is added. It can return false
* to stop the iteration.
* @return Array containing all recurrences.
*/
all: function(iterator) {
if (iterator) {
return this._iter(new CallbackIterResult('all', {}, iterator));
} else {
var result = this._cacheGet('all');
if (result === false) {
result = this._iter(new IterResult('all', {}));
this._cacheAdd('all', result);
}
return result;
}
},
/**
* Returns all the occurrences of the rrule between after and before.
* The inc keyword defines what happens if after and/or before are
* themselves occurrences. With inc == True, they will be included in the
* list, if they are found in the recurrence set.
* @return Array
*/
between: function(after, before, inc, iterator) {
var args = {
before: before,
after: after,
inc: inc
}
if (iterator) {
return this._iter(
new CallbackIterResult('between', args, iterator));
} else {
var result = this._cacheGet('between', args);
if (result === false) {
result = this._iter(new IterResult('between', args));
this._cacheAdd('between', result, args);
}
return result;
}
},
/**
* Returns the last recurrence before the given datetime instance.
* The inc keyword defines what happens if dt is an occurrence.
* With inc == True, if dt itself is an occurrence, it will be returned.
* @return Date or null
*/
before: function(dt, inc) {
var args = {
dt: dt,
inc: inc
},
result = this._cacheGet('before', args);
if (result === false) {
result = this._iter(new IterResult('before', args));
this._cacheAdd('before', result, args);
}
return result;
},
/**
* Returns the first recurrence after the given datetime instance.
* The inc keyword defines what happens if dt is an occurrence.
* With inc == True, if dt itself is an occurrence, it will be returned.
* @return Date or null
*/
after: function(dt, inc) {
var args = {
dt: dt,
inc: inc
},
result = this._cacheGet('after', args);
if (result === false) {
result = this._iter(new IterResult('after', args));
this._cacheAdd('after', result, args);
}
return result;
},
/**
* Returns the number of recurrences in this set. It will have go trough
* the whole recurrence, if this hasn't been done before.
*/
count: function() {
return this.all().length;
},
/**
* Converts the rrule into its string representation
* @see <http://www.ietf.org/rfc/rfc2445.txt>
* @return String
*/
toString: function() {
var attrs = [], key, keys, value,
origValue, currentValue, strValues;
if (this._string) {
return this._string;
}
keys = [
'byhour', 'byminute', 'bymonth',
'bymonthday', 'bysecond', 'bysetpos',
'byweekday', 'byweekno', 'byyearday',
'count', 'interval', 'until', 'wkst'
];
attrs.push(['FREQ', RRule.FREQUENCIES[this.freq]]);
for (var i = 0; i < keys.length; i++) {
key = keys[i];
// Only attributes specified in the options argument
// passed to the constructor will be included in the string
// representation
if (typeof this.origOptions[key] == 'undefined') {
continue;
}
// Do not modify the currentValue array, use this instead
// to store string values
strValues = [];
// Some values are taken from the original options array
// (this.origOptions), and some from the modified version
// (this.options).
currentValue = this.options[key];
origValue = this.origOptions[key];
key = key.toUpperCase();
switch (key) {
case 'WKST':
value = new Weekday(currentValue).toString();
break;
case 'BYWEEKDAY':
key = 'BYDAY';
// XXX: always use origValue, this won't work as expected
// when byweekday contains +n and also -n
value = (currentValue === null)
? this.options.bynweekday
: currentValue;
for (var wday, j = 0; j < value.length; j++) {
wday = value[j];
if (wday instanceof Array) {
wday = new Weekday(wday[0], wday[1]);
} else {
wday = new Weekday(wday);
}
strValues[j] = wday.toString();
}
value = strValues;
break;
case'UNTIL':
value = dateutil.timeToUntilString(currentValue);
break;
default:
if (origValue instanceof Array) {
for (var j = 0; j < origValue.length; j++) {
strValues[j] = String(origValue[j]);
}
value = strValues;
} else {
value = String(origValue);
}
}
attrs.push([key, value]);
}
var strings = [];
for (var i = 0; i < attrs.length; i++) {
var attr = attrs[i];
strings.push(attr[0] + '=' + attr[1].toString());
}
this._string = strings.join(';');
return this._string;
},
/**
* Will convert all rules described in nlp:ToText
* to text.
*/
toText: function(today, today, gettext, language) {
if (!_.has(this, '_text')) {
this._text = getnlp().toText(this, today, gettext, language);
}
return this._text;
},
isFullyConvertibleToText: function() {
return getnlp().isFullyConvertible(this)
},
/**
* @param {String} what - all/before/after/between
* @param {Array,Date} value - an array of dates, one date, or null
* @param {Object?} args - _iter arguments
*/
_cacheAdd: function(what, value, args) {
if (!this.options.cache) return;
if (value) {
value = (value instanceof Date)
? dateutil.clone(value)
: dateutil.cloneDates(value);
}
if (what == 'all') {
this._cache.all = value;
} else {
args._value = value;
this._cache[what].push(args);
}
},
/**
* @return false - not in the cache
* null - cached, but zero occurrences (before/after)
* Date - cached (before/after)
* [] - cached, but zero occurrences (all/between)
* [Date1, DateN] - cached (all/between)
*/
_cacheGet: function(what, args) {
if (!this.options.cache) {
return false;
}
var cached = false;
if (what == 'all') {
cached = this._cache.all;
} else {
// Let's see whether we've already called the
// 'what' method with the same 'args'
loopItems:
for (var item, i = 0; i < this._cache[what].length; i++) {
item = this._cache[what][i];
for (var k in args) {
if (args.hasOwnProperty(k)
&& String(args[k]) != String(item[k])) {
continue loopItems;
}
}
cached = item._value;
break;
}
}
if (!cached && this._cache.all) {
// Not in the cache, but we already know all the occurrences,
// so we can find the correct dates from the cached ones.
var iterResult = new IterResult(what, args);
for (var i = 0; i < this._cache.all.length; i++) {
if (!iterResult.accept(this._cache.all[i])) {
break;
}
}
cached = iterResult.getValue();
this._cacheAdd(what, cached, args);
}
return cached instanceof Array
? dateutil.cloneDates(cached)
: (cached instanceof Date
? dateutil.clone(cached)
: cached);
},
/**
* @return a RRule instance with the same freq and options
* as this one (cache is not cloned)
*/
clone: function() {
return new RRule(this.freq, this.origOptions);
},
_iter: function(iterResult) {
/* Since JavaScript doesn't have the python's yield operator (<1.7),
we use the IterResult object that tells us when to stop iterating.
*/
var dtstart = this.options.dtstart;
var
year = dtstart.getFullYear(),
month = dtstart.getMonth() + 1,
day = dtstart.getDate(),
hour = dtstart.getHours(),
minute = dtstart.getMinutes(),
second = dtstart.getSeconds(),
weekday = dateutil.getWeekday(dtstart),
yearday = dateutil.getYearDay(dtstart);
// Some local variables to speed things up a bit
var
freq = this.freq,
interval = this.options.interval,
wkst = this.options.wkst,
until = this.options.until,