month/month.js at master · kiltjs/month · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

function getDate(year, month, day) {
  return new Date(Date.UTC(year, month, day));
}

function addPreviousDays (list, i, n, month, year) {
  for(; i <= n ; i++ ) list.push({
    date: i,
    month: month,
    year: year,
    previous: true
  });
}

function addNextDays (list, i, n, month, year) {
  for(; i <= n ; i++ ) list.push({
    date: i,
    month: month,
    year: year,
    next: true
  });
}

function monthInformation(year, month, m, start_day){

  m = m || {};

  var i, n,
      d = getDate(year, month, 1),
      previous_month_d = getDate(year, month, 0),
      month_last_day = getDate(year, month + 1, 0),
      next_month_d = getDate(year, month + 1, 1);

  start_day = start_day || 0;
  m.start_day = start_day;

  var last_day = previous_month_d.getUTCDate();
  var last_week_day = previous_month_d.getUTCDay();

  m.meta = {
    date: d,
    last_day: last_day,
    last_week_day: last_week_day,
    week_day: d.getUTCDay(),
    month_last_day: month_last_day
  };

  m.year = d.getUTCFullYear();
  m.month = d.getUTCMonth();

  var list = [], lastMonthFirstWeekDay = last_day - last_week_day + start_day;

  // previous month days
  addPreviousDays(
    list,
    lastMonthFirstWeekDay,
    last_week_day - start_day + lastMonthFirstWeekDay,
    previous_month_d.getUTCMonth(),
    previous_month_d.getUTCFullYear()
  );

  // current month days
  for( i = 1, n = month_last_day.getUTCDate() ; i <= n ; i++ ) list.push({
    date: i,
    month: month,
    year: year,
    current: true
  });

  // next month days
  addNextDays(
    list,
    1,
    42 - list.length,
    next_month_d.getUTCMonth(),
    next_month_d.getUTCFullYear()
  );

  m.days = list;

  return m;
}

var default_start_day = 0;

function Month (year, month, start_day) {
  if( month < 0 ) {
    month += 12;
    year -= 1;
  } else if( month > 11 ) {
    month -= 12;
    year += 1;
  }

  if( year instanceof Date ) {
    month = year.getUTCMonth();
    year = year.getUTCFullYear();
  }

  monthInformation(year, month, this, start_day || default_start_day);
}

Month.options = {};
Month.setFirstWeekDay = function (start_day) {
  default_start_day = start_day;
};

Month.prototype.previous = function () {
  return new Month(this.year, this.month - 1, this.start_day);
};

Month.prototype.next = function () {
  return new Month(this.year, this.month + 1, this.start_day);
};

Month.prototype.getColumns = function() {
  var columns = [], column;

  for( var c = 0; c < 7; c++ ) {
    column = [];
    columns.push(column);
    for( var r = 0; r < 6; r++ ) {
      column.push( this.days[ r*7 + c ] );
    }
  }

  return columns;
};

module.exports = Month;