贴一份完整的DateFormat代码

好长时间没有来ITeYe, 回顾上一篇文章时，觉得有必要配合上一篇文章《Javascript日期的Format与Parse》把完整的代码贴出来，也算代表自己没有继续潜水。

 

$package("js.text");

$import("js.text.Format");
$import("js.util.LinkedList");

js.text.SimpleDateFormat = function(pattern, DateFormatSymbols){
    
    var CLASS = js.text.SimpleDateFormat, thi$ = CLASS.prototype;
    if(CLASS.__defined__){
        this._init.apply(this, arguments);
        return;
    }
    CLASS.__defined__ = true;
    
    var Class = js.lang.Class, System = J$VM.System;

    var TOKEN = /yy(?:yy)?|M{1,}|d{1,2}|E{1,}|([Hhms])\1?|S(?:SS)?|[azZG]|"[^"]*"|'[^']*'/g;
    
    var Regx = {
        yy : "(\\d{2})", yyyy : "(\\d{4})", G : "(\\S+)",
        M  : "([1-9]|1[012])", MM : "(0[1-9]|1[012])",
        MMM : "(\\S+)", MMMM : "(\\S+)",
        d : "([1-9]|[12][0-9]|3[01])", dd : "(0[1-9]|[12][0-9]|3[01])",
        E : "(\\S+)", EE : "(\\S+)", EEE : "(\\S+)", EEEE : "(\\S+)",
        H : "([0-9]|1[0-9]|2[0-3])", HH : "(0[0-9]|1[0-9]|2[0-3])",
        h : "([1-9]|1[012])", hh : "(0[1-9]|1[012])", a : "(\\S+)",
        m : "([0-9]|[1-5][0-9])", mm : "([0-5][0-9])",
        s : "([0-9]|[1-5][0-9])", ss : "([0-5][0-9])",
        S : "(\\d{1,3})", SSS : "(\\d{3})",
        z : "(\\S+)", Z : "([\\-\\+]\\d{2,4})"
    };
    
    var Getter = new function(){
        var _pad  = function(val, len){val = "000"+String(val); return val.slice(val.length - (len || 2)); };
        var _week = function(D,$,b){return b ? D.getUTCDay() : D.getDay();};
        this.yy   = function(D,$,b){return _pad(this.yyyy(D,$,b), 2);};
        this.yyyy = function(D,$,b){return _pad((b ? D.getUTCFullYear() : D.getFullYear()), 4);};
        this.M    = function(D,$,b){return ( b ? D.getUTCMonth() : D.getMonth())+1;};
        this.MM   = function(D,$,b){return _pad(this.M(D,$,b), 2);};
        this.MMM  = function(D,$,b){return $.getShortMonths()[this.M(D,$,b) - 1];};
        this.MMMM = function(D,$,b){return $.getMonths()[this.M(D,$,b) - 1];};
        this.d    = function(D,$,b){return b ? D.getUTCDate() : D.getDate();};
        this.dd   = function(D,$,b){return _pad(this.d(D,$,b), 2);};
        this.E    = function(D,$,b){return $.getShortWeekdays()[_week(D,$,b)];};
        this.EE   = function(D,$,b){return $.getShortWeekdays()[_week(D,$,b)];};
        this.EEE  = function(D,$,b){return $.getShortWeekdays()[_week(D,$,b)];};
        this.EEEE = function(D,$,b){return $.getWeekdays()[_week(D,$,b)];};
        this.H    = function(D,$,b){return b ? D.getUTCHours() : D.getHours();};
        this.HH   = function(D,$,b){return _pad(this.H(D,$,b), 2);};
        this.h    = function(D,$,b){return this.H(D,$,b) % 12 || 12;};
        this.hh   = function(D,$,b){return _pad(this.h(D,$,b), 2);};
        this.m    = function(D,$,b){return b ? D.getUTCMinutes() : D.getMinutes();};
        this.mm   = function(D,$,b){return _pad(this.m(D,$,b), 2);};
        this.s    = function(D,$,b){return b ? D.getUTCSeconds() : D.getSeconds();};
        this.ss   = function(D,$,b){return _pad(this.s(D,$,b));};
        this.S    = function(D,$,b){return b ? D.getUTCMilliseconds() : D.getMilliseconds();};
        this.SSS  = function(D,$,b){return _pad(this.S(D,$,b), 3);};
        this.a    = function(D,$,b){return $.getAmPmStrings()[this.H(D,$,b) < 12 ? 0:1];};
        this.G    = function(D,$,b){return $.getEras()[parseInt(this.yyyy(D,$,b),10) < 0 ? 0:1];};
        this.z    = function(D,$,b){return b ? "UTC" : (String(D).match(js.text.SimpleDateFormat.TIMEZONE) || [""]).pop().replace(/[^-+\dA-Z]/g, "");};
        this.Z    = function(D,$,b){var o = D.getTimezoneOffset(), ao = Math.abs(o);return (o > 0 ? "-" : "+") + _pad(Math.floor(ao/60)*100 + ao%60, 4);};
    };

    var Setter = new function(){
        this.yy   = function(D,v,$,b){return this.yyyy(D,v,$,b);};
        this.yyyy = function(D,v,$,b){var y = parseInt(v, 10); D.y = (y > 0 && D.bc) ? 0-y : y; b ? D.setUTCFullYear(D.y) : D.setFullYear(D.y); return D;};
        this.M    = function(D,v,$,b){var M = parseInt(v, 10)-1; b ? D.setUTCMonth(M) : D.setMonth(M); return D;};
        this.MM   = function(D,v,$,b){return this.M(D,v,$,b);};
        this.MMM  = function(D,v,$,b){var i = $.getShortMonths().indexOf(v); return i !=-1 ? this.M(D,i+1,$,b) : D;};
        this.MMMM = function(D,v,$,b){var i = $.getMonths().indexOf(v); return i !=-1 ? this.M(D,i+1,$,b) : D;};
        this.d    = function(D,v,$,b){var d = parseInt(v,10); b ? D.setUTCDate(d) : D.setDate(d); return D;};
        this.dd   = function(D,v,$,b){return this.d(D,v,$,b);};
        this.E    = function(D,v,$,b){return D;};
        this.EE   = function(D,v,$,b){return D;};
        this.EEE  = function(D,v,$,b){return D;};
        this.EEEE = function(D,v,$,b){return D;};
        this.H    = function(D,v,$,b){var h = parseInt(v, 10); D.h = (h < 12 && D.pm) ? (h+12)%24 : h; b ? D.setUTCHours(D.h) : D.setHours(D.h); return D;};
        this.HH   = function(D,v,$,b){return this.H(D,v,$,b);};
        this.h    = function(D,v,$,b){return this.H(D,v,$,b);};
        this.hh   = function(D,v,$,b){return this.H(D,v,$,b);};
        this.m    = function(D,v,$,b){var m = parseInt(v, 10); b ? D.setUTCMinutes(m) : D.setMinutes(m); return D;};
        this.mm   = function(D,v,$,b){return this.m(D,v,$,b);};
        this.s    = function(D,v,$,b){var s = parseInt(v, 10); b ? D.setUTCSeconds(s) : D.setSeconds(s); return D;};
        this.ss   = function(D,v,$,b){return this.s(D,v,$,b);};
        this.S    = function(D,v,$,b){var S = parseInt(v, 10); b ? D.setUTCMilliseconds(S) : D.setMilliseconds(S); return D;};
        this.SSS  = function(D,v,$,b){return this.S(D,v,$,b);};
        this.a    = function(D,v,$,b){switch($.getAmPmStrings().indexOf(v)){case 0:D.am = true;return (D.h && D.h == 12) ? this.H(D, 0, $, b) : D;case 1:D.pm = true;return D.h ? this.H(D, D.h, $, b) : D;}return D;},
        this.G    = function(D,v,$,b){if($.getEras().indexOf(v) === 0){D.bc = true; return D.y ? this.yyyy(D, D.y, $, b) : D;}return D;};
        this.z    = function(D,v,$,b){return D;};
        this.Z    = function(D,v,$,b){return D;};
    };
    
    /**
     * Set format pattern
     * 
     * @param pattern, String type
     */
    thi$.setPattern = function(pattern){
        pattern = this.pattern = pattern || "EEE MMM dd HH:mm:ss yyyy";

        CLASS.infos = CLASS.infos || {};

        var info = CLASS.infos[pattern];
        if(info) return;

        info = CLASS.infos[pattern] = {};

        var pIndex = info.pIndex = js.util.LinkedList.newInstance();
        
        var str = pattern.replace(
            TOKEN, 
            function($0){
                var t = $0.charAt(0);
                $0 = ((t == 'M' || t == 'E') && $0.length > 4) ? 
                    $0.slice(0, 4) : $0;
                if(typeof Setter[$0] === "function"){
                    pIndex.push($0);
                    return Regx[$0];
                }

                if($0.length >= 2){
                    $0 = $0.replace(/"|'/g, "");
                }

                return $0;
            });

        info.dPattern = new RegExp(str);

    }.$override(this.setPattern);
    
    /**
     * Set format symbols
     * 
     * @see js.text.DateFormatSymbols
     */
    thi$.setDateFormatSymbols = function(DateFormatSymbols){
        this.symbols = DateFormatSymbols || 
            new(Class.forName("js.text.DateFormatSymbols"))();
    };

    /**
     * @see js.text.Format
     */     
    thi$.setSymbols = function(symbols){
        this.symbols = symbols || 
            new(Class.forName("js.text.DateFormatSymbols"))();

    }.$override(this.setSymbols);

    /**
     * Return a formatted string of the specified date
     * 
     * @param date, Date type, if null use current date
     * @param isUTC, boolean type, whether is UTC
     * 
     * @return String
     */
    thi$.format = function(date, isUTC){
        date = date ? date : new Date();
        if(!Class.isDate(date)){
            return date;
        }
        
        var _symbols = this.symbols;
        return this.pattern.replace(
            TOKEN, 
            function($0){
                var t = $0.charAt(0);
                $0 = ((t == 'M' || t == 'E') && $0.length > 4) ? 
                    $0.slice(0, 4) : $0;
                return (typeof Getter[$0] === "function") ? 
                    Getter[$0](date, _symbols, isUTC) : 
                    $0.slice(1, $0.length-1);
            });

    }.$override(this.format);
    
    /**
     * Return a <code>Date<code> object from a date string
     * 
     * @param datestr, String type
     * @param isUTC, boolean type, whether is UTC
     * 
     * @return Date
     */
    thi$.parse = function(datestr, isUTC){
        var info = CLASS.infos[this.pattern], 
        pIndex = info.pIndex, _symbols = this.symbols, 
        date, m = datestr.match(info.dPattern),$0;
        if(m){
            date = new Date(0);
            for(var i=1, len = m.length; i<len; i++){
                $0 = pIndex[i-1];
                date = Setter[$0](date, m[i], _symbols, isUTC);               
            }
            return date;
        }

        try{
            date = new Date(Date.parse(datestr));    
        } catch (x) {
            
        }
        
        if(!Class.isDate(date))
            throw SyntaxError("Invalid date string");

        return date;

    }.$override(this.parse);

    this._init.apply(this, arguments);
    
}.$extend(js.text.Format);


if(Date.SF === undefined){
    Date.SF = new js.text.SimpleDateFormat();

    Date.prototype.$format = function(pattern, isUTC){
        if(pattern) Date.SF.setPattern(pattern);
        return Date.SF.format(this, isUTC);
    };

    Date.$parse = function(datestr, pattern, symbols, isUTC){
        if(pattern) Date.SF.setPattern(pattern);
        if(symbols) Date.SF.setSymbols(symbols);
        return Date.SF.parse(datestr, isUTC);
    };
}