nativedate.java

java中比较著名的js引擎当属mozilla开源的rhino

        index *= 3;
        for (int i = 0; i != 3; ++i) {
            sb.append(months.charAt(index + i));
        }
    }

    private static void appendWeekDayName(StringBuffer sb, int index)
    {
        String days = "Sun"+"Mon"+"Tue"+"Wed"+"Thu"+"Fri"+"Sat";
        index *= 3;
        for (int i = 0; i != 3; ++i) {
            sb.append(days.charAt(index + i));
        }
    }

    private static double makeTime(double date, Object[] args, int methodId)
    {
        int maxargs;
        boolean local = true;
        switch (methodId) {
          case Id_setUTCMilliseconds:
              local = false;
            // fallthrough
          case Id_setMilliseconds:
            maxargs = 1;
            break;

          case Id_setUTCSeconds:
              local = false;
            // fallthrough
          case Id_setSeconds:
            maxargs = 2;
            break;

          case Id_setUTCMinutes:
              local = false;
            // fallthrough
          case Id_setMinutes:
            maxargs = 3;
            break;

          case Id_setUTCHours:
              local = false;
            // fallthrough
          case Id_setHours:
            maxargs = 4;
            break;

          default:
              Kit.codeBug();
            maxargs = 0;
        }

        int i;
        double conv[] = new double[4];
        double hour, min, sec, msec;
        double lorutime; /* Local or UTC version of date */

        double time;
        double result;

        /* just return NaN if the date is already NaN */
        if (date != date)
            return date;

        /* Satisfy the ECMA rule that if a function is called with
         * fewer arguments than the specified formal arguments, the
         * remaining arguments are set to undefined.  Seems like all
         * the Date.setWhatever functions in ECMA are only varargs
         * beyond the first argument; this should be set to undefined
         * if it's not given.  This means that "d = new Date();
         * d.setMilliseconds()" returns NaN.  Blech.
         */
        if (args.length == 0)
            args = ScriptRuntime.padArguments(args, 1);

        for (i = 0; i < args.length && i < maxargs; i++) {
            conv[i] = ScriptRuntime.toNumber(args[i]);

            // limit checks that happen in MakeTime in ECMA.
            if (conv[i] != conv[i] || Double.isInfinite(conv[i])) {
                return ScriptRuntime.NaN;
            }
            conv[i] = ScriptRuntime.toInteger(conv[i]);
        }

        if (local)
            lorutime = LocalTime(date);
        else
            lorutime = date;

        i = 0;
        int stop = args.length;

        if (maxargs >= 4 && i < stop)
            hour = conv[i++];
        else
            hour = HourFromTime(lorutime);

        if (maxargs >= 3 && i < stop)
            min = conv[i++];
        else
            min = MinFromTime(lorutime);

        if (maxargs >= 2 && i < stop)
            sec = conv[i++];
        else
            sec = SecFromTime(lorutime);

        if (maxargs >= 1 && i < stop)
            msec = conv[i++];
        else
            msec = msFromTime(lorutime);

        time = MakeTime(hour, min, sec, msec);
        result = MakeDate(Day(lorutime), time);

        if (local)
            result = internalUTC(result);
        date = TimeClip(result);

        return date;
    }

    private static double makeDate(double date, Object[] args, int methodId)
    {
        int maxargs;
        boolean local = true;
        switch (methodId) {
          case Id_setUTCDate:
              local = false;
            // fallthrough
          case Id_setDate:
              maxargs = 1;
            break;

          case Id_setUTCMonth:
              local = false;
            // fallthrough
          case Id_setMonth:
              maxargs = 2;
            break;

          case Id_setUTCFullYear:
              local = false;
            // fallthrough
          case Id_setFullYear:
              maxargs = 3;
            break;

          default:
              Kit.codeBug();
            maxargs = 0;
        }

        int i;
        double conv[] = new double[3];
        double year, month, day;
        double lorutime; /* local or UTC version of date */
        double result;

        /* See arg padding comment in makeTime.*/
        if (args.length == 0)
            args = ScriptRuntime.padArguments(args, 1);

        for (i = 0; i < args.length && i < maxargs; i++) {
            conv[i] = ScriptRuntime.toNumber(args[i]);

            // limit checks that happen in MakeDate in ECMA.
            if (conv[i] != conv[i] || Double.isInfinite(conv[i])) {
                return ScriptRuntime.NaN;
            }
            conv[i] = ScriptRuntime.toInteger(conv[i]);
        }

        /* return NaN if date is NaN and we're not setting the year,
         * If we are, use 0 as the time. */
        if (date != date) {
            if (args.length < 3) {
                return ScriptRuntime.NaN;
            } else {
                lorutime = 0;
            }
        } else {
            if (local)
                lorutime = LocalTime(date);
            else
                lorutime = date;
        }

        i = 0;
        int stop = args.length;

        if (maxargs >= 3 && i < stop)
            year = conv[i++];
        else
            year = YearFromTime(lorutime);

        if (maxargs >= 2 && i < stop)
            month = conv[i++];
        else
            month = MonthFromTime(lorutime);

        if (maxargs >= 1 && i < stop)
            day = conv[i++];
        else
            day = DateFromTime(lorutime);

        day = MakeDay(year, month, day); /* day within year */
        result = MakeDate(day, TimeWithinDay(lorutime));

        if (local)
            result = internalUTC(result);

        date = TimeClip(result);

        return date;
    }

// #string_id_map#

    protected int findPrototypeId(String s)
    {
        int id;
// #generated# Last update: 2004-03-17 13:33:23 CET
        L0: { id = 0; String X = null; int c;
            L: switch (s.length()) {
            case 6: X="getDay";id=Id_getDay; break L;
            case 7: switch (s.charAt(3)) {
                case 'D': c=s.charAt(0);
                    if (c=='g') { X="getDate";id=Id_getDate; }
                    else if (c=='s') { X="setDate";id=Id_setDate; }
                    break L;
                case 'T': c=s.charAt(0);
                    if (c=='g') { X="getTime";id=Id_getTime; }
                    else if (c=='s') { X="setTime";id=Id_setTime; }
                    break L;
                case 'Y': c=s.charAt(0);
                    if (c=='g') { X="getYear";id=Id_getYear; }
                    else if (c=='s') { X="setYear";id=Id_setYear; }
                    break L;
                case 'u': X="valueOf";id=Id_valueOf; break L;
                } break L;
            case 8: switch (s.charAt(3)) {
                case 'H': c=s.charAt(0);
                    if (c=='g') { X="getHours";id=Id_getHours; }
                    else if (c=='s') { X="setHours";id=Id_setHours; }
                    break L;
                case 'M': c=s.charAt(0);
                    if (c=='g') { X="getMonth";id=Id_getMonth; }
                    else if (c=='s') { X="setMonth";id=Id_setMonth; }
                    break L;
                case 'o': X="toSource";id=Id_toSource; break L;
                case 't': X="toString";id=Id_toString; break L;
                } break L;
            case 9: X="getUTCDay";id=Id_getUTCDay; break L;
            case 10: c=s.charAt(3);
                if (c=='M') {
                    c=s.charAt(0);
                    if (c=='g') { X="getMinutes";id=Id_getMinutes; }
                    else if (c=='s') { X="setMinutes";id=Id_setMinutes; }
                }
                else if (c=='S') {
                    c=s.charAt(0);
                    if (c=='g') { X="getSeconds";id=Id_getSeconds; }
                    else if (c=='s') { X="setSeconds";id=Id_setSeconds; }
                }
                else if (c=='U') {
                    c=s.charAt(0);
                    if (c=='g') { X="getUTCDate";id=Id_getUTCDate; }
                    else if (c=='s') { X="setUTCDate";id=Id_setUTCDate; }
                }
                break L;
            case 11: switch (s.charAt(3)) {
                case 'F': c=s.charAt(0);
                    if (c=='g') { X="getFullYear";id=Id_getFullYear; }
                    else if (c=='s') { X="setFullYear";id=Id_setFullYear; }
                    break L;
                case 'M': X="toGMTString";id=Id_toGMTString; break L;
                case 'T': X="toUTCString";id=Id_toUTCString; break L;
                case 'U': c=s.charAt(0);
                    if (c=='g') {
                        c=s.charAt(9);
                        if (c=='r') { X="getUTCHours";id=Id_getUTCHours; }
                        else if (c=='t') { X="getUTCMonth";id=Id_getUTCMonth; }
                    }
                    else if (c=='s') {
                        c=s.charAt(9);
                        if (c=='r') { X="setUTCHours";id=Id_setUTCHours; }
                        else if (c=='t') { X="setUTCMonth";id=Id_setUTCMonth; }
                    }
                    break L;
                case 's': X="constructor";id=Id_constructor; break L;
                } break L;
            case 12: c=s.charAt(2);
                if (c=='D') { X="toDateString";id=Id_toDateString; }
                else if (c=='T') { X="toTimeString";id=Id_toTimeString; }
                break L;
            case 13: c=s.charAt(0);
                if (c=='g') {
                    c=s.charAt(6);
                    if (c=='M') { X="getUTCMinutes";id=Id_getUTCMinutes; }
                    else if (c=='S') { X="getUTCSeconds";id=Id_getUTCSeconds; }
                }
                else if (c=='s') {
                    c=s.charAt(6);
                    if (c=='M') { X="setUTCMinutes";id=Id_setUTCMinutes; }
                    else if (c=='S') { X="setUTCSeconds";id=Id_setUTCSeconds; }
                }
                break L;
            case 14: c=s.charAt(0);
                if (c=='g') { X="getUTCFullYear";id=Id_getUTCFullYear; }
                else if (c=='s') { X="setUTCFullYear";id=Id_setUTCFullYear; }
                else if (c=='t') { X="toLocaleString";id=Id_toLocaleString; }
                break L;
            case 15: c=s.charAt(0);
                if (c=='g') { X="getMilliseconds";id=Id_getMilliseconds; }
                else if (c=='s') { X="setMilliseconds";id=Id_setMilliseconds; }
                break L;
            case 17: X="getTimezoneOffset";id=Id_getTimezoneOffset; break L;
            case 18: c=s.charAt(0);
                if (c=='g') { X="getUTCMilliseconds";id=Id_getUTCMilliseconds; }
                else if (c=='s') { X="setUTCMilliseconds";id=Id_setUTCMilliseconds; }
                else if (c=='t') {
                    c=s.charAt(8);
                    if (c=='D') { X="toLocaleDateString";id=Id_toLocaleDateString; }
                    else if (c=='T') { X="toLocaleTimeString";id=Id_toLocaleTimeString; }
                }
                break L;
            }
            if (X!=null && X!=s && !X.equals(s)) id = 0;
        }
// #/generated#
        return id;
    }

    private static final int
        ConstructorId_now       = -3,
        ConstructorId_parse     = -2,
        ConstructorId_UTC       = -1,

        Id_constructor          =  1,
        Id_toString             =  2,
        Id_toTimeString         =  3,
        Id_toDateString         =  4,
        Id_toLocaleString       =  5,
        Id_toLocaleTimeString   =  6,
        Id_toLocaleDateString   =  7,
        Id_toUTCString          =  8,
        Id_toSource             =  9,
        Id_valueOf              = 10,
        Id_getTime              = 11,
        Id_getYear              = 12,
        Id_getFullYear          = 13,
        Id_getUTCFullYear       = 14,
        Id_getMonth             = 15,
        Id_getUTCMonth          = 16,
        Id_getDate              = 17,
        Id_getUTCDate           = 18,
        Id_getDay               = 19,
        Id_getUTCDay            = 20,
        Id_getHours             = 21,
        Id_getUTCHours          = 22,
        Id_getMinutes           = 23,
        Id_getUTCMinutes        = 24,
        Id_getSeconds           = 25,
        Id_getUTCSeconds        = 26,
        Id_getMilliseconds      = 27,
        Id_getUTCMilliseconds   = 28,
        Id_getTimezoneOffset    = 29,
        Id_setTime              = 30,
        Id_setMilliseconds      = 31,
        Id_setUTCMilliseconds   = 32,
        Id_setSeconds           = 33,
        Id_setUTCSeconds        = 34,
        Id_setMinutes           = 35,
        Id_setUTCMinutes        = 36,
        Id_setHours             = 37,
        Id_setUTCHours          = 38,
        Id_setDate              = 39,
        Id_setUTCDate           = 40,
        Id_setMonth             = 41,
        Id_setUTCMonth          = 42,
        Id_setFullYear          = 43,
        Id_setUTCFullYear       = 44,
        Id_setYear              = 45,

        MAX_PROTOTYPE_ID        = 45;

    private static final int
        Id_toGMTString  =  Id_toUTCString; // Alias, see Ecma B.2.6
// #/string_id_map#

    /* cached values */
    private static java.util.TimeZone thisTimeZone;
    private static double LocalTZA;
    private static java.text.DateFormat timeZoneFormatter;
    private static java.text.DateFormat localeDateTimeFormatter;
    private static java.text.DateFormat localeDateFormatter;
    private static java.text.DateFormat localeTimeFormatter;

    private double date;
}