Flowdock
new(p1 = v1, p2 = v2, p3 = v3, p4 = v4) public

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static VALUE
date_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE vy, vm, vd, vsg, y, fr, fr2, ret;
    int m, d;
    double sg;
    struct SimpleDateData *dat = rb_check_typeddata(self, &d_lite_type);

    if (!simple_dat_p(dat)) {
        rb_raise(rb_eTypeError, "Date expected");
    }

    rb_scan_args(argc, argv, "04", &vy, &vm, &vd, &vsg);

    y = INT2FIX(-4712);
    m = 1;
    d = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 4:
        val2sg(vsg, sg);
      case 3:
        num2int_with_frac(d, positive_inf);
      case 2:
        m = NUM2INT(vm);
      case 1:
        y = vy;
    }

    if (guess_style(y, sg) < 0) {
        VALUE nth;
        int ry, rm, rd;

        if (!valid_gregorian_p(y, m, d,
                               &nth, &ry,
                               &rm, &rd))
            rb_raise(rb_eArgError, "invalid date");

        set_to_simple(self, dat, nth, 0, sg, ry, rm, rd, HAVE_CIVIL);
    }
    else {
        VALUE nth;
        int ry, rm, rd, rjd, ns;

        if (!valid_civil_p(y, m, d, sg,
                           &nth, &ry,
                           &rm, &rd, &rjd,
                           &ns))
            rb_raise(rb_eArgError, "invalid date");

        set_to_simple(self, dat, nth, rjd, sg, ry, rm, rd, HAVE_JD | HAVE_CIVIL);
    }
    ret = self;
    add_frac();
    return ret;
}
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