Ticket #3629: jalaliCalendar.js

/**
 * @author Javad Mowlanezhad jmowla@gmail.com
 * @version 1.0.0
 */
(function($) {

	function JalaliCalendar() {
		var _jDIM = [31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29];
		var _gDIM = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

		/**
		 * Checks input parameter for Array object, if the object is Array returns true otherwise false
		 * @param a
		 */
		function _isArray(a) {
			return (a && a.constructor && a.constructor.toString().match(/\Array\(\)/));
		}

		function _div(a, b) {
			return Math.floor(a / b);
		}

		function _ds2da(ds) {
			if (_isArray(ds))
				return ds;
			if (ds == "")
				return [];
			var da = ds.split(" ")[0].split("-");
			if (da[1] == undefined)
				da = ds.split(" ")[0].split("/");
			return da;
		}

		function _ivda(da) {
			return !(da[0] === "" || da[1] === "" || da[2] === "");
		}

		function _isjvd(d) {
			d = _ds2da(d);
			var j = _g2j(_j2g(d));
			return d[0] === j[0] && d[1] === j[1] && d[2] === j[2];
		}

		function _isgvd(d) {
			d = _ds2da(d);
			var g = _j2g(_g2j(d));
			return d[0] === g[0] && d[1] === g[1] && d[2] === g[2];
		}

		function _j2JUL(j) {
			var jy, jm, jd, jdn,i;

			jy = j[0] - 979;
			jm = j[1] - 1;
			jd = j[2] - 1;
			jdn = 365 * jy + _div(jy, 33) * 8 + _div((jy % 33 + 3), 4);
			for (i = 0; i < jm; ++i)
				jdn += _jDIM[i];
			return jdn + jd;
		}

		function _JUL2j(gdn) {
			var gy, gm, gd, leap, i;

			gy = 1600 + 400 * _div(gdn, 146097);
			gdn = gdn % 146097;
			leap = 1;
			if (gdn >= 36525) {
				gdn--;
				gy += 100 * _div(gdn, 36524);
				gdn = gdn % 36524;

				if (gdn >= 365)
					gdn++;
				else
					leap = 0;
			}
			gy += 4 * _div(gdn, 1461);
			gdn %= 1461;
			if (gdn >= 366) {
				leap = 0;
				gdn--;
				gy += _div(gdn, 365);
				gdn = gdn % 365;
			}
			for (i = 0; gdn >= _gDIM[i] + (i == 1 && leap); i++)
				gdn -= _gDIM[i] + (i == 1 && leap);
			gm = i + 1;
			gd = gdn + 1;
			return [gy, gm, gd];
		}

		function _g2JUL(g) {
			var gy, gm, gd, gdn, i;

			gy = g[0] - 1600;
			gm = g[1] - 1;
			gd = g[2] - 1;
			gdn = 365 * gy + _div((gy + 3), 4) - _div((gy + 99), 100) + _div((gy + 399), 400);
			for (i = 0; i < gm; ++i)
				gdn += _gDIM[i];
			if (gm > 1 && ((gy % 4 == 0 && gy % 100 != 0) || (gy % 400 == 0)))
				++gdn;
			return gdn + gd;
		}

		function _JUL2g(jdn) {
			var j_np, jy, jm, jd, i;

			j_np = _div(jdn, 12053);
			jdn %= 12053;

			jy = 979 + 33 * j_np + 4 * _div(jdn, 1461);
			jdn %= 1461;
			if (jdn >= 366) {
				jy += _div((jdn - 1), 365);
				jdn = (jdn - 1) % 365;
			}
			for (i = 0; i < 11 && jdn >= _jDIM[i]; ++i)
				jdn -= _jDIM[i];
			jm = i + 1;
			jd = jdn + 1;
			return [jy, jm, jd];
		}

		function _j2g(j) {
			j = _ds2da(j);
			if (!_ivda(j))
				return [];
			return _JUL2j(_j2JUL(j) + 79);
		}

		function _g2j(g) {
			g = _ds2da(g);
			if (!_ivda(g))
				return [];
			return _JUL2g(_g2JUL(g) - 79);
		}

		return {
			gregorianToJalali: function(g) {
				return _g2j(g);
			},
			gregorianToJalaliStr: function(_g) {
				var g = _ds2da(_g);
				if (!_ivda(g))
					return "";
				var j = _g2j(g);
				return j[0] + "/" + (j[1] > 9 ? j[1] : "0" + j[1]) + "/" + (j[2] > 9 ? j[2] : "0" + j[2]);
			},
			jalaliToGregorianStr: function (_j, _st) {
				var j = _ds2da(_j);
				if (!_ivda(j))
					return "";
				var g = _j2g(j);
				return g[0] + "/" + g[1] + "/" + g[2] + (!_st ? "" : " " + _j.split(" ")[1].split(".")[0]);
			},
			jalaliToGregorian: function(j) {
				return _j2g(j);
			},
			today: function() {
				var _today = new Date();
				return this.gregorianToJalaliStr([_today.getFullYear(),(_today.getMonth() + 1),_today.getDate()]);
			},
			isValidJ: function(d) {
				return _isjvd(d);
			},
			isValidG: function(d) {
				return _isgvd(d);
			},
			getDaysInMonth: function(y, m) {
				return 32 - new Date(y, m, 32).getDate();
			},

			version: "1.0.0"
		};
	};

	if ($._gDate == undefined) {
		Date.prototype._getFullYear = Date.prototype.getFullYear;
		Date.prototype._setFullYear = Date.prototype.setFullYear;
		Date.prototype._getMonth = Date.prototype.getMonth;
		Date.prototype._setMonth = Date.prototype.setMonth;
		Date.prototype._getDate = Date.prototype.getDate;
		Date.prototype._setDate = Date.prototype.setDate;

		Date.prototype._getCJD = function() {
			return $.jalaliCalendar.gregorianToJalali([this._getFullYear(), this._getMonth() + 1, this._getDate()]);
		};

		Date.prototype.getFullYear = function() {
			return this._getCJD()[0];
		};

		Date.prototype.setFullYear = function(y) {
			var j = this._getCJD();
			var g = $.jalaliCalendar.jalaliToGregorian([y, j[1], j[2]]);
			this._setDate(1);
			this._setFullYear(g[0]);
			this._setMonth(g[1] - 1);
			this._setDate(g[2]);
		};

		Date.prototype.getMonth = function() {
			return this._getCJD()[1] - 1;
		};

		Date.prototype.setMonth = function(m) {
			var j = this._getCJD();
			var g = $.jalaliCalendar.jalaliToGregorian([j[0], m + 1, j[2]]);
			this._setDate(1);
			this._setFullYear(g[0]);
			this._setMonth(g[1] - 1);
			this._setDate(g[2]);
		};

		Date.prototype.getDate = function() {
			return this._getCJD()[2];
		};

		Date.prototype.setDate = function(d) {
			var j = this._getCJD();
			var g = $.jalaliCalendar.jalaliToGregorian([j[0], j[1], d]);
			this._setDate(1);
			this._setFullYear(g[0]);
			this._setMonth(g[1] - 1);
			this._setDate(g[2]);
		};

		$._gDate = Date;		// save original Date object for further reference and use
		window.Date = function() {
			this.prototype = $._gDate.prototype;
			var _p = [], _al = arguments.length;
			for (var i = 0; i < _al; i++)
				_p.push(arguments[i]);
			var _d = null;
			if (_al == 0)
				_d = new $._gDate();
			else if (_al == 1) {
				_d = new $._gDate(_p[0]);
			} else if (_al >= 3) {
				_p[1]++;
				var _g = $.jalaliCalendar.jalaliToGregorian(_p);
				for (i = 3; i < _al; i++)
					_g.push(_p[i]);
				for (i = _al; i < 7; i++)
					_g.push(0);
				_d = new $._gDate(_g[0], _g[1] - 1, _g[2], _g[3], _g[4], _g[5], _g[6]);
			}
			return _d;
		};
	}

	if ($.jalaliCalendar == undefined) {
		$.jalaliCalendar = new JalaliCalendar();
		window.jalaliCalendar= $.jalaliCalendar;
	}
})(jQuery);