CalendarMonthBodyCtrl.prototype.buildCalendarForMonth = function()

in modules/js/datepicker/datepicker.js [1090:1196]
71 lines of code
14 McCabe index (conditional complexity)

  CalendarMonthBodyCtrl.prototype.buildCalendarForMonth = function(opt_dateInMonth) {
    var date = this.dateUtil.isValidDate(opt_dateInMonth) ? opt_dateInMonth : new Date();

    var firstDayOfMonth = this.dateUtil.getFirstDateOfMonth(date);
    var firstDayOfTheWeek = this.getLocaleDay_(firstDayOfMonth);
    var numberOfDaysInMonth = this.dateUtil.getNumberOfDaysInMonth(date);

    // Store rows for the month in a document fragment so that we can append them all at once.
    var monthBody = document.createDocumentFragment();

    var rowNumber = 1;
    var row = this.buildDateRow(rowNumber);
    monthBody.appendChild(row);

    // If this is the final month in the list of items, only the first week should render,
    // so we should return immediately after the first row is complete and has been
    // attached to the body.
    var isFinalMonth = this.offset === this.monthCtrl.items.length - 1;

    // Add a label for the month. If the month starts on a Sun/Mon/Tues, the month label
    // goes on a row above the first of the month. Otherwise, the month label takes up the first
    // two cells of the first row.
    var blankCellOffset = 0;
    var monthLabelCell = document.createElement('td');
    var monthLabelCellContent = document.createElement('span');
    var calendarCtrl = this.calendarCtrl;

    monthLabelCellContent.textContent = this.dateLocale.monthHeaderFormatter(date);
    monthLabelCell.appendChild(monthLabelCellContent);
    monthLabelCell.classList.add('md-calendar-month-label');
    // If the entire month is after the max date, render the label as a disabled state.
    if (calendarCtrl.maxDate && firstDayOfMonth > calendarCtrl.maxDate) {
      monthLabelCell.classList.add('md-calendar-month-label-disabled');
    // If the user isn't supposed to be able to change views, render the
    // label as usual, but disable the clicking functionality.
    } else if (!calendarCtrl.mode) {
      monthLabelCell.addEventListener('click', this.monthCtrl.headerClickHandler);
      monthLabelCell.setAttribute('data-timestamp', firstDayOfMonth.getTime());
      monthLabelCell.setAttribute('aria-label', this.dateLocale.monthFormatter(date));
      monthLabelCell.classList.add('md-calendar-label-clickable');
      monthLabelCell.appendChild(this.arrowIcon.cloneNode(true));
    }

    if (firstDayOfTheWeek <= 2) {
      monthLabelCell.setAttribute('colspan', '7');

      var monthLabelRow = this.buildDateRow();
      monthLabelRow.appendChild(monthLabelCell);
      monthBody.insertBefore(monthLabelRow, row);

      if (isFinalMonth) {
        return monthBody;
      }
    } else {
      blankCellOffset = 3;
      monthLabelCell.setAttribute('colspan', '3');
      row.appendChild(monthLabelCell);
    }

    // Add a blank cell for each day of the week that occurs before the first of the month.
    // For example, if the first day of the month is a Tuesday, add blank cells for Sun and Mon.
    // The blankCellOffset is needed in cases where the first N cells are used by the month label.
    for (var i = blankCellOffset; i < firstDayOfTheWeek; i++) {
      row.appendChild(this.buildDateCell());
    }

    // Add a cell for each day of the month, keeping track of the day of the week so that
    // we know when to start a new row.
    var dayOfWeek = firstDayOfTheWeek;
    var iterationDate = firstDayOfMonth;
    for (var d = 1; d <= numberOfDaysInMonth; d++) {
      // If we've reached the end of the week, start a new row.
      if (dayOfWeek === 7) {
        // We've finished the first row, so we're done if this is the final month.
        if (isFinalMonth) {
          return monthBody;
        }
        dayOfWeek = 0;
        rowNumber++;
        row = this.buildDateRow(rowNumber);
        monthBody.appendChild(row);
      }

      iterationDate.setDate(d);
      var cell = this.buildDateCell(iterationDate);
      row.appendChild(cell);

      dayOfWeek++;
    }

    // Ensure that the last row of the month has 7 cells.
    while (row.childNodes.length < 7) {
      row.appendChild(this.buildDateCell());
    }

    // Ensure that all months have 6 rows. This is necessary for now because the virtual-repeat
    // requires that all items have exactly the same height.
    while (monthBody.childNodes.length < 6) {
      var whitespaceRow = this.buildDateRow();
      for (var j = 0; j < 7; j++) {
        whitespaceRow.appendChild(this.buildDateCell());
      }
      monthBody.appendChild(whitespaceRow);
    }

    return monthBody;
  };