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jquery.calendars.discworld.js
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jquery.calendars.discworld.js
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/* http://keith-wood.name/calendars.html
Discworld calendar for jQuery v2.0.2.
Written by Keith Wood (wood.keith{at}optusnet.com.au) January 2016.
Available under the MIT (http://keith-wood.name/licence.html) license.
Please attribute the author if you use it. */
(function($) { // Hide scope, no $ conflict
/** Implementation of the Discworld calendar - Unseen University version.
See also <a href="http://wiki.lspace.org/mediawiki/Discworld_calendar">http://wiki.lspace.org/mediawiki/Discworld_calendar</a>
and <a href="http://discworld.wikia.com/wiki/Discworld_calendar">http://discworld.wikia.com/wiki/Discworld_calendar</a>.
@class DiscworldCalendar
@param [language=''] {string} The language code (default English) for localisation. */
function DiscworldCalendar(language) {
this.local = this.regionalOptions[language || ''] || this.regionalOptions[''];
}
DiscworldCalendar.prototype = new $.calendars.baseCalendar;
$.extend(DiscworldCalendar.prototype, {
/** The calendar name.
@memberof DiscworldCalendar */
name: 'Discworld',
/** Julian date of start of Discworld epoch: 1 January 0001 CE.
@memberof DiscworldCalendar */
jdEpoch: 1721425.5,
/** Days per month in a common year.
@memberof DiscworldCalendar */
daysPerMonth: [16, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32],
/** <code>true</code> if has a year zero, <code>false</code> if not.
@memberof DiscworldCalendar */
hasYearZero: false,
/** The minimum month number.
@memberof DiscworldCalendar */
minMonth: 1,
/** The first month in the year.
@memberof DiscworldCalendar */
firstMonth: 1,
/** The minimum day number.
@memberof DiscworldCalendar */
minDay: 1,
/** Localisations for the plugin.
Entries are objects indexed by the language code ('' being the default US/English).
Each object has the following attributes.
@memberof DiscworldCalendar
@property name {string} The calendar name.
@property epochs {string[]} The epoch names.
@property monthNames {string[]} The long names of the months of the year.
@property monthNamesShort {string[]} The short names of the months of the year.
@property dayNames {string[]} The long names of the days of the week.
@property dayNamesShort {string[]} The short names of the days of the week.
@property dayNamesMin {string[]} The minimal names of the days of the week.
@property dateFormat {string} The date format for this calendar.
See the options on <a href="BaseCalendar.html#formatDate"><code>formatDate</code></a> for details.
@property firstDay {number} The number of the first day of the week, starting at 0.
@property isRTL {number} <code>true</code> if this localisation reads right-to-left. */
regionalOptions: { // Localisations
'': {
name: 'Discworld',
epochs: ['BUC', 'UC'],
monthNames: ['Ick', 'Offle', 'February', 'March', 'April', 'May', 'June',
'Grune', 'August', 'Spune', 'Sektober', 'Ember', 'December'],
monthNamesShort: ['Ick', 'Off', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Gru', 'Aug', 'Spu', 'Sek', 'Emb', 'Dec'],
dayNames: ['Sunday', 'Octeday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
dayNamesShort: ['Sun', 'Oct', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
dayNamesMin: ['Su', 'Oc', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'],
digits: null,
dateFormat: 'yyyy/mm/dd',
firstDay: 2,
isRTL: false
}
},
/** Determine whether this date is in a leap year.
@memberof DiscworldCalendar
@param year {CDate|number} The date to examine or the year to examine.
@return {boolean} <code>true</code> if this is a leap year, <code>false</code> if not.
@throws Error if an invalid year or a different calendar used. */
leapYear: function(year) {
this._validate(year, this.minMonth, this.minDay, $.calendars.local.invalidYear);
return false;
},
/** Retrieve the number of months in a year.
@memberof DiscworldCalendar
@param year {CDate|number} The date to examine or the year to examine.
@return {number} The number of months.
@throws Error if an invalid year or a different calendar used. */
monthsInYear: function(year) {
this._validate(year, this.minMonth, this.minDay, $.calendars.local.invalidYear);
return 13;
},
/** Retrieve the number of days in a year.
@memberof DiscworldCalendar
@param year {CDate|number} The date to examine or the year to examine.
@return {number} The number of days.
@throws Error if an invalid year or a different calendar used. */
daysInYear: function(year) {
this._validate(year, this.minMonth, this.minDay, $.calendars.local.invalidYear);
return 400;
},
/** Determine the week of the year for a date.
@memberof DiscworldCalendar
@param year {CDate|number} The date to examine or the year to examine.
@param [month] {number} The month to examine.
@param [day] {number} The day to examine.
@return {number} The week of the year.
@throws Error if an invalid date or a different calendar used. */
weekOfYear: function(year, month, day) {
// Find Sunday of this week starting on Sunday
var checkDate = this.newDate(year, month, day);
checkDate.add(-checkDate.dayOfWeek(), 'd');
return Math.floor((checkDate.dayOfYear() - 1) / 8) + 1;
},
/** Retrieve the number of days in a month.
@memberof DiscworldCalendar
@param year {CDate|number} The date to examine or the year of the month.
@param [month] {number} The month.
@return {number} The number of days in this month.
@throws Error if an invalid month/year or a different calendar used. */
daysInMonth: function(year, month) {
var date = this._validate(year, month, this.minDay, $.calendars.local.invalidMonth);
return this.daysPerMonth[date.month() - 1];
},
/** Retrieve the number of days in a week.
@memberof DiscworldCalendar
@return {number} The number of days. */
daysInWeek: function() {
return 8;
},
/** Retrieve the day of the week for a date.
@memberof DiscworldCalendar
@param year {CDate|number} The date to examine or the year to examine.
@param [month] {number} The month to examine.
@param [day] {number} The day to examine.
@return {number} The day of the week: 0 to number of days - 1.
@throws Error if an invalid date or a different calendar used. */
dayOfWeek: function(year, month, day) {
var date = this._validate(year, month, day, $.calendars.local.invalidDate);
return (date.day() + 1) % 8;
},
/** Determine whether this date is a week day.
@memberof DiscworldCalendar
@param year {CDate|number} The date to examine or the year to examine.
@param [month] {number} The month to examine.
@param [day] {number} The day to examine.
@return {boolean} <code>true</code> if a week day, <code>false</code> if not.
@throws Error if an invalid date or a different calendar used. */
weekDay: function(year, month, day) {
var dow = this.dayOfWeek(year, month, day);
return (dow >= 2 && dow <= 6);
},
/** Retrieve additional information about a date.
@memberof DiscworldCalendar
@param year {CDate|number} The date to examine or the year to examine.
@param [month] {number} The month to examine.
@param [day] {number} The day to examine.
@return {object} Additional information - contents depends on calendar.
@throws Error if an invalid date or a different calendar used. */
extraInfo: function(year, month, day) {
var date = this._validate(year, month, day, $.calendars.local.invalidDate);
return {century: centuries[Math.floor((date.year() - 1) / 100) + 1] || ''};
},
/** Retrieve the Julian date equivalent for this date,
i.e. days since January 1, 4713 BCE Greenwich noon.
@memberof DiscworldCalendar
@param year {CDate|number} The date to convert or the year to convert.
@param [month] {number} The month to convert.
@param [day] {number} The day to convert.
@return {number} The equivalent Julian date.
@throws Error if an invalid date or a different calendar used. */
toJD: function(year, month, day) {
var date = this._validate(year, month, day, $.calendars.local.invalidDate);
year = date.year() + (date.year() < 0 ? 1 : 0);
month = date.month();
day = date.day();
return day + (month > 1 ? 16 : 0) + (month > 2 ? (month - 2) * 32 : 0) +
(year - 1) * 400 + this.jdEpoch - 1;
},
/** Create a new date from a Julian date.
@memberof DiscworldCalendar
@param jd {number} The Julian date to convert.
@return {CDate} The equivalent date. */
fromJD: function(jd) {
jd = Math.floor(jd + 0.5) - Math.floor(this.jdEpoch) - 1;
var year = Math.floor(jd / 400) + 1;
jd -= (year - 1) * 400;
jd += (jd > 15 ? 16 : 0);
var month = Math.floor(jd / 32) + 1;
var day = jd - (month - 1) * 32 + 1;
return this.newDate(year <= 0 ? year - 1 : year, month, day);
}
});
// Names of the centuries
var centuries = {
20: 'Fruitbat',
21: 'Anchovy'
};
// Discworld calendar implementation
$.calendars.calendars.discworld = DiscworldCalendar;
})(jQuery);