/*
 * copyright (c) 2004 baron schwartz <baron at sequent dot org>
 *
 * this program is free software; you can redistribute it and/or modify it
 * under the terms of the gnu lesser general public license as published by the
 * free software foundation, version 2.1.
 *
 * this program is distributed in the hope that it will be useful, but without
 * any warranty; without even the implied warranty of merchantability or fitness
 * for a particular purpose.  see the gnu lesser general public license for more
 * details.
 */

date.parsefunctions = {count:0};
date.parseregexes = [];
date.formatfunctions = {count:0};

date.prototype.dateformat = function(format) {
    if (date.formatfunctions[format] == null) {
        date.createnewformat(format);
    }
    var func = date.formatfunctions[format];
    return this[func]();
}

date.createnewformat = function(format) {
    var funcname = "format" + date.formatfunctions.count++;
    date.formatfunctions[format] = funcname;
    var code = "date.prototype." + funcname + " = function(){return ";
    var special = false;
    var ch = '';
    for (var i = 0; i < format.length; ++i) {
        ch = format.charat(i);
        if (!special && ch == "\\") {
            special = true;
        }
        else if (special) {
            special = false;
            code += "'" + string.escape(ch) + "' + ";
        }
        else {
            code += date.getformatcode(ch);
        }
    }
    eval(code.substring(0, code.length - 3) + ";}");
}

date.getformatcode = function(character) {
    switch (character) {
    case "d":
        return "string.leftpad(this.getdate(), 2, '0') + ";
    case "d":
        return "date.daynames[this.getday()].substring(0, 3) + ";
    case "e":
    	return "date.daynamesmid[this.getday()].substring(1,2) + ";
    case "e":
    	return "date.daynamesmid[this.getday()] + ";
    case "j":
        return "this.getdate() + ";
    case "l":
        return "date.daynames[this.getday()] + ";
    case "s":
        return "this.getsuffix() + ";
    case "w":
        return "this.getday() + ";
    case "z":
        return "this.getdayofyear() + ";
    case "w":
        return "this.getweekofyear() + ";
    case "f":
        return "date.monthnames[this.getmonth()] + ";
    case "m":
        return "string.leftpad(this.getmonth() + 1, 2, '0') + ";
    case "m":
        return "date.monthnames[this.getmonth()].substring(0, 3) + ";
    case "n":
        return "(this.getmonth() + 1) + ";
    case "t":
        return "this.getdaysinmonth() + ";
    case "l":
        return "(this.isleapyear() ? 1 : 0) + ";
    case "y":
        return "this.getfullyear() + ";
    case "y":
        return "('' + this.getfullyear()).substring(2, 4) + ";
    case "a":
        return "(this.gethours() < 12 ? 'am' : 'pm') + ";
    case "a":
        return "(this.gethours() < 12 ? 'am' : 'pm') + ";
    case "g":
        return "((this.gethours() %12) ? this.gethours() % 12 : 12) + ";
    case "g":
        return "this.gethours() + ";
    case "h":
        return "string.leftpad((this.gethours() %12) ? this.gethours() % 12 : 12, 2, '0') + ";
    case "h":
        return "string.leftpad(this.gethours(), 2, '0') + ";
    case "i":
        return "string.leftpad(this.getminutes(), 2, '0') + ";
    case "s":
        return "string.leftpad(this.getseconds(), 2, '0') + ";
    case "o":
        return "this.getgmtoffset() + ";
    case "t":
        return "this.gettimezone() + ";
    case "z":
        return "(this.gettimezoneoffset() * -60) + ";
    default:
        return "'" + string.escape(character) + "' + ";
    }
}

date.parsedate = function(input, format) {
    if (date.parsefunctions[format] == null) {
        date.createparser(format);
    }
    var func = date.parsefunctions[format];
    return date[func](input);
}

date.createparser = function(format) {
    var funcname = "parse" + date.parsefunctions.count++;
    var regexnum = date.parseregexes.length;
    var currentgroup = 1;
    date.parsefunctions[format] = funcname;

    var code = "date." + funcname + " = function(input){\n"
        + "var y = -1, m = -1, d = -1, h = -1, i = -1, s = -1;\n"
        + "var d = new date();\n"
        + "y = d.getfullyear();\n"
        + "m = d.getmonth();\n"
        + "d = d.getdate();\n"
        + "var results = input.match(date.parseregexes[" + regexnum + "]);\n"
        + "if (results && results.length > 0) {"
    var regex = "";

    var special = false;
    var ch = '';
    for (var i = 0; i < format.length; ++i) {
        ch = format.charat(i);
        if (!special && ch == "\\") {
            special = true;
        }
        else if (special) {
            special = false;
            regex += string.escape(ch);
        }
        else {
            obj = date.formatcodetoregex(ch, currentgroup);
            currentgroup += obj.g;
            regex += obj.s;
            if (obj.g && obj.c) {
                code += obj.c;
            }
        }
    }

    code += "if (y > 0 && m >= 0 && d > 0 && h >= 0 && i >= 0 && s >= 0)\n"
        + "{return new date(y, m, d, h, i, s);}\n"
        + "else if (y > 0 && m >= 0 && d > 0 && h >= 0 && i >= 0)\n"
        + "{return new date(y, m, d, h, i);}\n"
        + "else if (y > 0 && m >= 0 && d > 0 && h >= 0)\n"
        + "{return new date(y, m, d, h);}\n"
        + "else if (y > 0 && m >= 0 && d > 0)\n"
        + "{return new date(y, m, d);}\n"
        + "else if (y > 0 && m >= 0)\n"
        + "{return new date(y, m);}\n"
        + "else if (y > 0)\n"
        + "{return new date(y);}\n"
        + "}return null;}";

    date.parseregexes[regexnum] = new regexp("^" + regex + "$");
    eval(code);
}

date.formatcodetoregex = function(character, currentgroup) {
    switch (character) {
    case "d":
        return {g:0,
        c:null,
        s:"(?:周日|周一|周二|周三|周四|周五|周六)"};
    case "j":
    case "d":
        return {g:1,
            c:"d = parseint(results[" + currentgroup + "], 10);\n",
            s:"(\\d{1,2})"};
    case "l":
        return {g:0,
            c:null,
            s:"(?:" + date.daynames.join("|") + ")"};
    case "s":
        return {g:0,
            c:null,
            s:"(?:st|nd|rd|th)"};
    case "w":
        return {g:0,
            c:null,
            s:"\\d"};
    case "z":
        return {g:0,
            c:null,
            s:"(?:\\d{1,3})"};
    case "w":
        return {g:0,
            c:null,
            s:"(?:\\d{2})"};
    case "f":
        return {g:1,
            c:"m = parseint(date.monthnumbers[results[" + currentgroup + "].substring(0, 3)], 10);\n",
            s:"(" + date.monthnames.join("|") + ")"};
    case "m":
        return {g:1,
            c:"m = parseint(date.monthnumbers[results[" + currentgroup + "]], 10);\n",
            s:"(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)"};
    case "n":
    case "m":
        return {g:1,
            c:"m = parseint(results[" + currentgroup + "], 10) - 1;\n",
            s:"(\\d{1,2})"};
    case "t":
        return {g:0,
            c:null,
            s:"\\d{1,2}"};
    case "l":
        return {g:0,
            c:null,
            s:"(?:1|0)"};
    case "y":
        return {g:1,
            c:"y = parseint(results[" + currentgroup + "], 10);\n",
            s:"(\\d{4})"};
    case "y":
        return {g:1,
            c:"var ty = parseint(results[" + currentgroup + "], 10);\n"
                + "y = ty > date.y2kyear ? 1900 + ty : 2000 + ty;\n",
            s:"(\\d{1,2})"};
    case "a":
        return {g:1,
            c:"if (results[" + currentgroup + "] == 'am') {\n"
                + "if (h == 12) { h = 0; }\n"
                + "} else { if (h < 12) { h += 12; }}",
            s:"(am|pm)"};
    case "a":
        return {g:1,
            c:"if (results[" + currentgroup + "] == 'am') {\n"
                + "if (h == 12) { h = 0; }\n"
                + "} else { if (h < 12) { h += 12; }}",
            s:"(am|pm)"};
    case "g":
    case "g":
    case "h":
    case "h":
        return {g:1,
            c:"h = parseint(results[" + currentgroup + "], 10);\n",
            s:"(\\d{1,2})"};
    case "i":
        return {g:1,
            c:"i = parseint(results[" + currentgroup + "], 10);\n",
            s:"(\\d{2})"};
    case "s":
        return {g:1,
            c:"s = parseint(results[" + currentgroup + "], 10);\n",
            s:"(\\d{2})"};
    case "o":
        return {g:0,
            c:null,
            s:"[+-]\\d{4}"};
    case "t":
        return {g:0,
            c:null,
            s:"[a-z]{3}"};
    case "z":
        return {g:0,
            c:null,
            s:"[+-]\\d{1,5}"};
    default:
        return {g:0,
            c:null,
            s:string.escape(character)};
    }
}

date.prototype.gettimezone = function() {
    return this.tostring().replace(
        /^.*? ([a-z]{3}) [0-9]{4}.*$/, "$1").replace(
        /^.*?\(([a-z])[a-z]+ ([a-z])[a-z]+ ([a-z])[a-z]+\)$/, "$1$2$3");
}

date.prototype.getgmtoffset = function() {
    return (this.gettimezoneoffset() > 0 ? "-" : "+")
        + string.leftpad(math.floor(this.gettimezoneoffset() / 60), 2, "0")
        + string.leftpad(this.gettimezoneoffset() % 60, 2, "0");
}

date.prototype.getdayofyear = function() {
    var num = 0;
    date.daysinmonth[1] = this.isleapyear() ? 29 : 28;
    for (var i = 0; i < this.getmonth(); ++i) {
        num += date.daysinmonth[i];
    }
    return num + this.getdate() - 1;
}

date.prototype.getweekofyear = function() {
    // skip to thursday of this week
    var now = this.getdayofyear() + (4 - this.getday());
    // find the first thursday of the year
    var jan1 = new date(this.getfullyear(), 0, 1);
    var then = (7 - jan1.getday() + 4);
    document.write(then);
    return string.leftpad(((now - then) / 7) + 1, 2, "0");
}

date.prototype.isleapyear = function() {
    var year = this.getfullyear();
    return ((year & 3) == 0 && (year % 100 || (year % 400 == 0 && year)));
}

date.prototype.getfirstdayofmonth = function() {
    var day = (this.getday() - (this.getdate() - 1)) % 7;
    return (day < 0) ? (day + 7) : day;
}

date.prototype.getlastdayofmonth = function() {
    var day = (this.getday() + (date.daysinmonth[this.getmonth()] - this.getdate())) % 7;
    return (day < 0) ? (day + 7) : day;
}

date.prototype.getdaysinmonth = function() {
    date.daysinmonth[1] = this.isleapyear() ? 29 : 28;
    return date.daysinmonth[this.getmonth()];
}
date.prototype.getfirstdateofcnweek = function() {
	var day = this.getday() > 0 ? this.getday() : 7;
	return new date(this - (day - 1) * 86400000);
};
date.prototype.getlastdateofcnweek = function() {
	var day = this.getday() > 0 ? this.getday() : 7;
	return new date(this + (7 - day) * 86400000);
};
date.prototype.getcnweekdates = function() {
	var firthday = this.getfirstdateofcnweek().gettime();
	var week = [];
	for ( var i = 0; i < 7; i++) {
		week.push(new date(firthday + 86400000*i));
	}
	return week;
};
date.prototype.getfirstdateofmonth = function() {
	var date = new date(this);
	date.setdate(1);
	return date;
};
date.prototype.getlastdateofmonth = function() {
	var nextmonthdate = new date(this);
	nextmonthdate.setmonth(this.getmonth() + 1);
	nextmonthdate.setdate(1);
	return new date(nextmonthdate - 86400000);
};
date.prototype.getsuffix = function() {
    switch (this.getdate()) {
        case 1:
        case 21:
        case 31:
            return "st";
        case 2:
        case 22:
            return "nd";
        case 3:
        case 23:
            return "rd";
        default:
            return "th";
    }
}

string.escape = function(string) {
    return string.replace(/('|\\)/g, "\\$1");
}

string.leftpad = function (val, size, ch) {
    var result = new string(val);
    if (ch == null) {
        ch = " ";
    }
    while (result.length < size) {
        result = ch + result;
    }
    return result;
}

date.daysinmonth = [31,28,31,30,31,30,31,31,30,31,30,31];
date.monthnames =
   ["一月",
    "二月",
    "三月",
    "四月",
    "五月",
    "六月",
    "七月",
    "八月",
    "九月",
    "十月",
    "十一月",
    "十二月"];
date.daynames =
   ["星期日",
    "星期一",
    "星期二",
    "星期三",
    "星期四",
    "星期五",
    "星期六"];
date.daynamesmid =
	   ["周日",
	    "周一",
	    "周二",
	    "周三",
	    "周四",
	    "周五",
	    "周六"];
date.y2kyear = 50;
date.monthnumbers = {
    jan:0,
    feb:1,
    mar:2,
    apr:3,
    may:4,
    jun:5,
    jul:6,
    aug:7,
    sep:8,
    oct:9,
    nov:10,
    dec:11};
date.patterns = {
    iso8601longpattern:"y-m-d h:i:s",
    iso8601shortpattern:"y-m-d",
    shortdatepattern: "n/j/y",
    longdatepattern: "l, f d, y",
    fulldatetimepattern: "l, f d, y g:i:s a",
    monthdaypattern: "f d",
    shorttimepattern: "g:i a",
    longtimepattern: "g:i:s a",
    sortabledatetimepattern: "y-m-d\\th:i:s",
    universalsortabledatetimepattern: "y-m-d h:i:so",
    yearmonthpattern: "f, y"};

/**    
 * 对date的扩展，将 date 转化为指定格式的string    
 * 月(m)、日(d)、12小时(h)、24小时(h)、分(m)、秒(s)、周(e)、季度(q) 可以用 1-2 个占位符    
 * 年(y)可以用 1-4 个占位符，毫秒(s)只能用 1 个占位符(是 1-3 位的数字)    
 * eg:    
 * (new date()).pattern("yyyy-mm-dd hh:mm:ss.s") ==> 2006-07-02 08:09:04.423    
 * (new date()).pattern("yyyy-mm-dd e hh:mm:ss") ==> 2009-03-10 二 20:09:04    
 * (new date()).pattern("yyyy-mm-dd ee hh:mm:ss") ==> 2009-03-10 周二 08:09:04    
 * (new date()).pattern("yyyy-mm-dd eee hh:mm:ss") ==> 2009-03-10 星期二 08:09:04    
 * (new date()).pattern("yyyy-m-d h:m:s.s") ==> 2006-7-2 8:9:4.18    
 */     
date.prototype.pattern=function(fmt) {      
    var o = {      
    "m+" : this.getmonth()+1, //月份      
    "d+" : this.getdate(), //日      
    "h+" : this.gethours()%12 == 0 ? 12 : this.gethours()%12, //小时      
    "h+" : this.gethours(), //小时      
    "m+" : this.getminutes(), //分      
    "s+" : this.getseconds(), //秒      
    "q+" : math.floor((this.getmonth()+3)/3), //季度      
    "s" : this.getmilliseconds() //毫秒      
    };      
    var week = {      
    "0" : "\u65e5",      
    "1" : "\u4e00",      
    "2" : "\u4e8c",      
    "3" : "\u4e09",      
    "4" : "\u56db",      
    "5" : "\u4e94",      
    "6" : "\u516d"     
    };      
    if(/(y+)/.test(fmt)){      
        fmt=fmt.replace(regexp.$1, (this.getfullyear()+"").substr(4 - regexp.$1.length));      
    }      
    if(/(e+)/.test(fmt)){      
        fmt=fmt.replace(regexp.$1, ((regexp.$1.length>1) ? (regexp.$1.length>2 ? "\u661f\u671f" : "\u5468") : "")+week[this.getday()+""]);      
    }      
    for(var k in o){      
        if(new regexp("("+ k +")").test(fmt)){      
            fmt = fmt.replace(regexp.$1, (regexp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));      
        }      
    }      
    return fmt;      
}