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/*
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* World Calendars
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* https://github.com/alexcjohnson/world-calendars
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*
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* Batch-converted from kbwood/calendars
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* Many thanks to Keith Wood and all of the contributors to the original project!
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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/* http://keith-wood.name/calendars.html
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Mayan calendar for jQuery v2.0.2.
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Written by Keith Wood (wood.keith{at}optusnet.com.au) August 2009.
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Available under the MIT (http://keith-wood.name/licence.html) license.
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Please attribute the author if you use it. */
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var main = require('../main');
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var assign = require('object-assign');
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/** Implementation of the Mayan Long Count calendar.
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See also <a href="http://en.wikipedia.org/wiki/Mayan_calendar">http://en.wikipedia.org/wiki/Mayan_calendar</a>.
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@class MayanCalendar
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@param [language=''] {string} The language code (default English) for localisation. */
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function MayanCalendar(language) {
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this.local = this.regionalOptions[language || ''] || this.regionalOptions[''];
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}
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MayanCalendar.prototype = new main.baseCalendar;
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assign(MayanCalendar.prototype, {
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/** The calendar name.
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@memberof MayanCalendar */
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name: 'Mayan',
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/** Julian date of start of Mayan epoch: 11 August 3114 BCE.
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@memberof MayanCalendar */
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jdEpoch: 584282.5,
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/** <code>true</code> if has a year zero, <code>false</code> if not.
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@memberof MayanCalendar */
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hasYearZero: true,
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/** The minimum month number.
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@memberof MayanCalendar */
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minMonth: 0,
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/** The first month in the year.
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@memberof MayanCalendar */
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firstMonth: 0,
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/** The minimum day number.
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@memberof MayanCalendar */
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minDay: 0,
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/** Localisations for the plugin.
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Entries are objects indexed by the language code ('' being the default US/English).
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Each object has the following attributes.
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@memberof MayanCalendar
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@property name {string} The calendar name.
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@property epochs {string[]} The epoch names.
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@property monthNames {string[]} The long names of the months of the year.
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@property monthNamesShort {string[]} The short names of the months of the year.
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@property dayNames {string[]} The long names of the days of the week.
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@property dayNamesShort {string[]} The short names of the days of the week.
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@property dayNamesMin {string[]} The minimal names of the days of the week.
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@property dateFormat {string} The date format for this calendar.
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See the options on <a href="BaseCalendar.html#formatDate"><code>formatDate</code></a> for details.
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@property firstDay {number} The number of the first day of the week, starting at 0.
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@property isRTL {number} <code>true</code> if this localisation reads right-to-left.
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@property haabMonths {string[]} The names of the Haab months.
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@property tzolkinMonths {string[]} The names of the Tzolkin months. */
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regionalOptions: { // Localisations
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'': {
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name: 'Mayan',
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epochs: ['', ''],
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monthNames: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'10', '11', '12', '13', '14', '15', '16', '17'],
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monthNamesShort: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'10', '11', '12', '13', '14', '15', '16', '17'],
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dayNames: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'10', '11', '12', '13', '14', '15', '16', '17', '18', '19'],
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dayNamesShort: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'10', '11', '12', '13', '14', '15', '16', '17', '18', '19'],
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dayNamesMin: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'10', '11', '12', '13', '14', '15', '16', '17', '18', '19'],
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digits: null,
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dateFormat: 'YYYY.m.d',
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firstDay: 0,
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isRTL: false,
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haabMonths: ['Pop', 'Uo', 'Zip', 'Zotz', 'Tzec', 'Xul', 'Yaxkin', 'Mol', 'Chen', 'Yax',
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'Zac', 'Ceh', 'Mac', 'Kankin', 'Muan', 'Pax', 'Kayab', 'Cumku', 'Uayeb'],
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tzolkinMonths: ['Imix', 'Ik', 'Akbal', 'Kan', 'Chicchan', 'Cimi', 'Manik', 'Lamat', 'Muluc', 'Oc',
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'Chuen', 'Eb', 'Ben', 'Ix', 'Men', 'Cib', 'Caban', 'Etznab', 'Cauac', 'Ahau']
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}
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},
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/** Determine whether this date is in a leap year.
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@memberof MayanCalendar
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@param year {CDate|number} The date to examine or the year to examine.
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@return {boolean} <code>true</code> if this is a leap year, <code>false</code> if not.
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@throws Error if an invalid year or a different calendar used. */
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leapYear: function(year) {
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this._validate(year, this.minMonth, this.minDay, main.local.invalidYear);
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return false;
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},
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/** Format the year, if not a simple sequential number.
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@memberof MayanCalendar
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@param year {CDate|number} The date to format or the year to format.
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@return {string} The formatted year.
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@throws Error if an invalid year or a different calendar used. */
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formatYear: function(year) {
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var date = this._validate(year, this.minMonth, this.minDay, main.local.invalidYear);
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year = date.year();
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var baktun = Math.floor(year / 400);
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year = year % 400;
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year += (year < 0 ? 400 : 0);
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var katun = Math.floor(year / 20);
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return baktun + '.' + katun + '.' + (year % 20);
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},
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/** Convert from the formatted year back to a single number.
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@memberof MayanCalendar
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@param years {string} The year as n.n.n.
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@return {number} The sequential year.
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@throws Error if an invalid value is supplied. */
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forYear: function(years) {
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years = years.split('.');
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if (years.length < 3) {
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throw 'Invalid Mayan year';
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}
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var year = 0;
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for (var i = 0; i < years.length; i++) {
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var y = parseInt(years[i], 10);
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if (Math.abs(y) > 19 || (i > 0 && y < 0)) {
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throw 'Invalid Mayan year';
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}
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year = year * 20 + y;
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}
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return year;
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},
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/** Retrieve the number of months in a year.
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@memberof MayanCalendar
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@param year {CDate|number} The date to examine or the year to examine.
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@return {number} The number of months.
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@throws Error if an invalid year or a different calendar used. */
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monthsInYear: function(year) {
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this._validate(year, this.minMonth, this.minDay, main.local.invalidYear);
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return 18;
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},
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/** Determine the week of the year for a date.
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@memberof MayanCalendar
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@param year {CDate|number} The date to examine or the year to examine.
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@param [month] {number} The month to examine.
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@param [day] {number} The day to examine.
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@return {number} The week of the year.
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@throws Error if an invalid date or a different calendar used. */
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weekOfYear: function(year, month, day) {
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this._validate(year, month, day, main.local.invalidDate);
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return 0;
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},
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/** Retrieve the number of days in a year.
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@memberof MayanCalendar
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@param year {CDate|number} The date to examine or the year to examine.
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@return {number} The number of days.
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@throws Error if an invalid year or a different calendar used. */
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daysInYear: function(year) {
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this._validate(year, this.minMonth, this.minDay, main.local.invalidYear);
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return 360;
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},
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/** Retrieve the number of days in a month.
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@memberof MayanCalendar
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@param year {CDate|number} The date to examine or the year of the month.
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@param [month] {number} The month.
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@return {number} The number of days in this month.
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@throws Error if an invalid month/year or a different calendar used. */
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daysInMonth: function(year, month) {
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this._validate(year, month, this.minDay, main.local.invalidMonth);
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return 20;
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},
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/** Retrieve the number of days in a week.
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@memberof MayanCalendar
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@return {number} The number of days. */
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daysInWeek: function() {
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return 5; // Just for formatting
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},
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/** Retrieve the day of the week for a date.
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@memberof MayanCalendar
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@param year {CDate|number} The date to examine or the year to examine.
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@param [month] {number} The month to examine.
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@param [day] {number} The day to examine.
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@return {number} The day of the week: 0 to number of days - 1.
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@throws Error if an invalid date or a different calendar used. */
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dayOfWeek: function(year, month, day) {
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var date = this._validate(year, month, day, main.local.invalidDate);
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return date.day();
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},
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/** Determine whether this date is a week day.
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@memberof MayanCalendar
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@param year {CDate|number} The date to examine or the year to examine.
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@param [month] {number} The month to examine.
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@param [day] {number} The day to examine.
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@return {boolean} <code>true</code> if a week day, <code>false</code> if not.
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@throws Error if an invalid date or a different calendar used. */
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weekDay: function(year, month, day) {
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this._validate(year, month, day, main.local.invalidDate);
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return true;
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},
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/** Retrieve additional information about a date - Haab and Tzolkin equivalents.
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@memberof MayanCalendar
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@param year {CDate|number} The date to examine or the year to examine.
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@param [month] {number} The month to examine.
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@param [day] {number} The day to examine.
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@return {object} Additional information - contents depends on calendar.
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@throws Error if an invalid date or a different calendar used. */
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extraInfo: function(year, month, day) {
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var date = this._validate(year, month, day, main.local.invalidDate);
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var jd = date.toJD();
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var haab = this._toHaab(jd);
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var tzolkin = this._toTzolkin(jd);
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return {haabMonthName: this.local.haabMonths[haab[0] - 1],
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haabMonth: haab[0], haabDay: haab[1],
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tzolkinDayName: this.local.tzolkinMonths[tzolkin[0] - 1],
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tzolkinDay: tzolkin[0], tzolkinTrecena: tzolkin[1]};
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},
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/** Retrieve Haab date from a Julian date.
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@memberof MayanCalendar
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@private
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@param jd {number} The Julian date.
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@return {number[]} Corresponding Haab month and day. */
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_toHaab: function(jd) {
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jd -= this.jdEpoch;
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var day = mod(jd + 8 + ((18 - 1) * 20), 365);
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return [Math.floor(day / 20) + 1, mod(day, 20)];
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},
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/** Retrieve Tzolkin date from a Julian date.
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@memberof MayanCalendar
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@private
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@param jd {number} The Julian date.
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@return {number[]} Corresponding Tzolkin day and trecena. */
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_toTzolkin: function(jd) {
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jd -= this.jdEpoch;
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return [amod(jd + 20, 20), amod(jd + 4, 13)];
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},
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/** Retrieve the Julian date equivalent for this date,
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i.e. days since January 1, 4713 BCE Greenwich noon.
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@memberof MayanCalendar
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@param year {CDate|number} The date to convert or the year to convert.
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@param [month] {number} The month to convert.
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@param [day] {number} The day to convert.
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@return {number} The equivalent Julian date.
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@throws Error if an invalid date or a different calendar used. */
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toJD: function(year, month, day) {
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var date = this._validate(year, month, day, main.local.invalidDate);
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return date.day() + (date.month() * 20) + (date.year() * 360) + this.jdEpoch;
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},
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/** Create a new date from a Julian date.
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@memberof MayanCalendar
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@param jd {number} The Julian date to convert.
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@return {CDate} The equivalent date. */
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fromJD: function(jd) {
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jd = Math.floor(jd) + 0.5 - this.jdEpoch;
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var year = Math.floor(jd / 360);
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jd = jd % 360;
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jd += (jd < 0 ? 360 : 0);
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var month = Math.floor(jd / 20);
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var day = jd % 20;
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return this.newDate(year, month, day);
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}
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});
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// Modulus function which works for non-integers.
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function mod(a, b) {
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return a - (b * Math.floor(a / b));
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}
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// Modulus function which returns numerator if modulus is zero.
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function amod(a, b) {
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return mod(a - 1, b) + 1;
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}
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// Mayan calendar implementation
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main.calendars.mayan = MayanCalendar;
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