JS util for generate countdown string

js-countdown

(function(define) {
    var SECONDS = {
        second: 1,
        minute: 60
    };
    SECONDS.hour = SECONDS.minute * 60;
    SECONDS.day = SECONDS.hour * 24;
    SECONDS.week = SECONDS.day * 7;
    var TIME_ARR = ['year', 'month', 'week', 'day', 'hour', 'minute', 'second'],
        TIME_ARR2 = TIME_ARR.slice(2);

    function twoNumber(number) {
        if (number < 10) {
            return '0' + number;
        } else {
            return '' + number;
        }

    }
    var numberFunctions = {
        '%Y': {
            name: 'year',
            twoNumber: false
        },
        '%YY': {
            name: 'year',
            twoNumber: true
        },
        '%M': {
            name: 'month',
            twoNumber: false
        },
        '%MM': {
            name: 'month',
            twoNumber: true
        },
        '%w': {
            name: 'week',
            twoNumber: false
        },
        '%ww': {
            name: 'week',
            twoNumber: true
        },
        '%d': {
            name: 'day',
            twoNumber: false
        },
        '%dd': {
            name: 'day',
            twoNumber: true
        },
        '%h': {
            name: 'hour',
            twoNumber: false
        },
        '%hh': {
            name: 'hour',
            twoNumber: true
        },
        '%m': {
            name: 'minute',
            twoNumber: false
        },
        '%mm': {
            name: 'minute',
            twoNumber: true
        },
        '%s': {
            name: 'second',
            twoNumber: false
        },
        '%ss': {
            name: 'second',
            twoNumber: true
        }
    };
    var matchNumberFunctions1 = /(%YY|%MM|%ww|%dd|%hh|%mm|%ss)/,
        matchNumberFunctions2 = /(%Y|%M|%w|%d|%h|%m|%s)/;

    function setTop(config, top) {
        TIME_ARR.forEach(function(key, i) {
            if (config[key]) {
                for (var j = i + 1; j < TIME_ARR.length; j++) {
                    top[TIME_ARR[j]] = key;
                }
            }
        });
    }

    function compileCountDown(format) {
        var arr = format.split(/(\(.+?\))/g).filter(function(str) {
            return str
        }),
            config = {},
            top = {},
            funcArr = arr.map(function(str) {
                var matched1 = str.match(matchNumberFunctions1),
                    matched2 = str.match(matchNumberFunctions2);
                if (matched1 || matched2) {
                    var key = (matched1 && matched1[0]) || matched2[0],
                        temp = numberFunctions[key];
                    config[temp.name] = true;
                    str = str.replace(/(^\(|\)$)/g, '');
                    return function(timeObj) {
                        var timeNumber = timeObj[temp.name];
                        if (timeNumber === -1) {
                            return '';
                        } else {
                            var result = temp.twoNumber ? twoNumber(timeNumber) : timeNumber;
                            return str.replace(key, result).replace(/({.+?})/, function(pluralStr) {
                                var pruralArr = pluralStr.replace(/(^{|}$)/g, '').split('|');
                                if (pruralArr.length === 1 || timeNumber === 0 || timeNumber === 1) {
                                    return pruralArr[0];
                                } else {
                                    return pruralArr[1];
                                }
                            });
                        }
                    };
                } else {
                    return str;
                }
            });
        setTop(config, top);
        return function(target, now) {
            return execCountDown(funcArr, target, now, config, top);
        };
    }

    function execCountDown(funcArr, target, now, config, top) {
        var timeObj = getTimeObj(target, now, config, top);
        return funcArr.map(function(item) {
            if (typeof item === 'function') {
                return item(timeObj);
            } else {
                return item;
            }
        }).join('');
    }

    function getTimeObj(target, now, config, top) {
        var timeObj = {},
            seconds;
        if (config.year) {
            var diff = target.getYear() - now.getYear();
            if (diff > 0) {
                var now2 = new Date(now.getTime());
                now2.setFullYear(now2.getFullYear() + diff);
                if (now2.getTime() > target.getTime()) {
                    now2.setFullYear(now2.getFullYear() - 1);
                    timeObj.year = diff - 1;
                } else {
                    timeObj.year = diff;
                }
                now = now2;
            } else {
                timeObj.year = 0;
            }
        }
        if (config.month) {
            var diff = (target.getMonth() + target.getYear() * 12) - (now.getMonth() + now.getYear() * 12);
            if (diff > 0) {
                var now2 = new Date(now.getTime());
                now2.setMonth(now2.getMonth() + diff);
                if (now2.getTime() > target.getTime()) {
                    now2.setMonth(now2.getMonth() - 1);
                    timeObj.month = diff - 1;
                } else {
                    timeObj.month = diff;
                }
                now = now2;
            } else {
                timeObj.month = 0;
            }
        }
        seconds = ((target.getTime() - now.getTime()) / 1000);
        TIME_ARR2.forEach(function(key, i) {
            if (config[key]) {
                var number = seconds;
                if (top[key] && SECONDS[top[key]]) {
                    number = number % SECONDS[top[key]];
                }
                timeObj[key] = parseInt(number / SECONDS[key], 10)
            }
        });
        TIME_ARR.forEach(function(key, i) {
            if (key in timeObj && timeObj[key] === 0) {
                var flag = true;
                for (var j = i - 1; j >= 0; j--) {
                    var temp = timeObj[TIME_ARR[j]];
                    if (temp && temp !== -1) {
                        flag = false;
                        break;
                    }
                }
                if (flag) {
                    timeObj[key] = -1;
                }
            }
        });
        return timeObj;
    };

    if (define) {
        define(function(require) {
            return compileCountDown;
        });
    } else {
        window.CountDown = compileCountDown;
    }
    return compileCountDown;
})(window.define);
// todo: performance & code clear up ; until & since

example usage:
var SECONDS = {
		second: 1,
		minute: 60
	};
	SECONDS.hour = SECONDS.minute * 60;
	SECONDS.day = SECONDS.hour * 24;
	SECONDS.week = SECONDS.day * 7;
(function () {
	var format = 'still (%w {week|weeks}, )(%dd {d}, )(%hh:)(%mm:)(%ss) to event',
		seconds = SECONDS.week * 2 + SECONDS.day * 5 + SECONDS.hour * 17 + SECONDS.minute * 45 + 15,
		div = document.getElementById('div1'),
		func = CountDown(format),
		target = new Date(new Date().getTime() + seconds*1000);
	setInterval(function () {
		div.innerHTML = func(target, new Date());
	}, 1000);
})();
(function () {
	var format = 'still (%h {hour|hours} )(%m {min|mins}) to event',
		seconds = SECONDS.day * 2 + SECONDS.hour * 5 + SECONDS.minute * 11 + 15,
		div = document.getElementById('div2'),
		func = CountDown(format),
		target = new Date(new Date().getTime() + seconds*1000);
	setInterval(function () {
		div.innerHTML = func(target, new Date());
	}, 1000);
})();
(function () {
	var format = 'still (%w {week|weeks}, )(%dd {d}, )(%hh:)(%mm:)(%ss) to event',
		seconds = SECONDS.week * 0 + SECONDS.day * 1 + SECONDS.hour * 0 + SECONDS.minute * 0 + 15,
		div = document.getElementById('div3'),
		func = CountDown(format),
		target = new Date(new Date().getTime() + seconds*1000);
	setInterval(function () {
		div.innerHTML = func(target, new Date());
	}, 1000);
})();
(function () {
	var format = 'still (%M {month|months}, )(%dd {d}, )(%hh:)(%mm:)(%ss) to event',
		seconds = SECONDS.week * 5 + SECONDS.day * 1 + SECONDS.hour * 0 + SECONDS.minute * 0 + 15,
		div = document.getElementById('div4'),
		func = CountDown(format),
		target = new Date(new Date().getTime() + seconds*1000);
	setInterval(function () {
		div.innerHTML = func(target, new Date());
	}, 1000);
})();
(function () {
	var format = 'still (%Y {year|years}, )(%M {month|months}, )(%w {week|weeks}, )(%d {day|days}, )(%hh:)(%mm:)(%ss) to event',
		seconds = SECONDS.week * 72 + SECONDS.day * 1 + SECONDS.hour * 0 + SECONDS.minute * 0 + 15,
		div = document.getElementById('div5'),
		func = CountDown(format),
		target = new Date(new Date().getTime() + seconds*1000);
	setInterval(function () {
		div.innerHTML = func(target, new Date());
	}, 1000);
})();