StackGenVis/frontend/node_modules/bootstrap-vue/esm/components/calendar/calendar.js

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

import Vue from '../../utils/vue';
import KeyCodes from '../../utils/key-codes';
import identity from '../../utils/identity';
import looseEqual from '../../utils/loose-equal';
import { arrayIncludes, concat } from '../../utils/array';
import { getComponentConfig } from '../../utils/config';
import { createDate, createDateFormatter, datesEqual, firstDateOfMonth, formatYMD, lastDateOfMonth, oneMonthAgo, oneMonthAhead, oneYearAgo, oneYearAhead, parseYMD, resolveLocale } from '../../utils/date';
import { requestAF } from '../../utils/dom';
import { isArray, isFunction, isPlainObject, isString } from '../../utils/inspect';
import { toInteger } from '../../utils/number';
import { toString } from '../../utils/string';
import idMixin from '../../mixins/id';
import normalizeSlotMixin from '../../mixins/normalize-slot';
import { BIconChevronLeft, BIconCircleFill } from '../../icons/icons';
import { BIconstack } from '../../icons/iconstack'; // --- Constants ---

var NAME = 'BCalendar'; // Key Codes

var UP = KeyCodes.UP,
    DOWN = KeyCodes.DOWN,
    LEFT = KeyCodes.LEFT,
    RIGHT = KeyCodes.RIGHT,
    PAGEUP = KeyCodes.PAGEUP,
    PAGEDOWN = KeyCodes.PAGEDOWN,
    HOME = KeyCodes.HOME,
    END = KeyCodes.END,
    ENTER = KeyCodes.ENTER,
    SPACE = KeyCodes.SPACE; // Languages that are RTL

var RTL_LANGS = ['ar', 'az', 'ckb', 'fa', 'he', 'ks', 'lrc', 'mzn', 'ps', 'sd', 'te', 'ug', 'ur', 'yi'].map(function (locale) {
  return locale.toLowerCase();
}); // --- Helper utilities ---

export var isLocaleRTL = function isLocaleRTL(locale) {
  // Determines if the locale is RTL (only single locale supported)
  var parts = toString(locale).toLowerCase().replace(/-u-.+/, '').split('-');
  var locale1 = parts.slice(0, 2).join('-');
  var locale2 = parts[0];
  return arrayIncludes(RTL_LANGS, locale1) || arrayIncludes(RTL_LANGS, locale2);
}; // --- BCalendar component ---
// @vue/component

export var BCalendar = Vue.extend({
  name: NAME,
  mixins: [idMixin, normalizeSlotMixin],
  model: {
    // Even though this is the default that Vue assumes, we need
    // to add it for the docs to reflect that this is the model
    // And also for some validation libraries to work
    prop: 'value',
    event: 'input'
  },
  props: {
    value: {
      type: [String, Date] // default: null

    },
    valueAsDate: {
      // Always return the `v-model` value as a date object
      type: Boolean,
      default: false
    },
    disabled: {
      type: Boolean,
      default: false
    },
    readonly: {
      type: Boolean,
      default: false
    },
    min: {
      type: [String, Date] // default: null

    },
    max: {
      type: [String, Date] // default: null

    },
    dateDisabledFn: {
      type: Function // default: null

    },
    startWeekday: {
      // `0` (Sunday), `1` (Monday), ... `6` (Saturday)
      // Day of week to start calendar on
      type: [Number, String],
      default: 0
    },
    locale: {
      // Locale(s) to use
      // Default is to use page/browser default setting
      type: [String, Array] // default: null

    },
    direction: {
      // 'ltr', 'rtl', or `null` (for auto detect)
      type: String // default: null

    },
    selectedVariant: {
      // Variant color to use for the selected date
      type: String,
      default: 'primary'
    },
    todayVariant: {
      // Variant color to use for today's date (defaults to `variant`)
      type: String // default: null

    },
    noHighlightToday: {
      // Disable highlighting today's date
      type: Boolean,
      default: false
    },
    dateInfoFn: {
      // Function to set a class of (classes) on the date cell
      // if passed a string or an array
      // TODO:
      //   If the function returns an object, look for class prop for classes,
      //   and other props for handling events/details/descriptions
      type: Function // default: null

    },
    width: {
      // Has no effect if prop `block` is set
      type: String,
      default: '270px'
    },
    block: {
      // Makes calendar the full width of its parent container
      type: Boolean,
      default: false
    },
    hideHeader: {
      // When true makes the selected date header `sr-only`
      type: Boolean,
      default: false
    },
    hidden: {
      // When `true`, renders a comment node, but keeps the component instance active
      // Mainly for <b-form-date>, so that we can get the component's value and locale
      // But we might just use separate date formatters, using the resolved locale
      // (adjusted for the gregorian calendar)
      type: Boolean,
      default: false
    },
    ariaControls: {
      type: String // default: null

    },
    roleDescription: {
      type: String // default: null

    },
    // Labels for buttons and keyboard shortcuts
    labelPrevYear: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelPrevYear');
      }
    },
    labelPrevMonth: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelPrevMonth');
      }
    },
    labelCurrentMonth: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelCurrentMonth');
      }
    },
    labelNextMonth: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelNextMonth');
      }
    },
    labelNextYear: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelNextYear');
      }
    },
    labelToday: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelToday');
      }
    },
    labelSelected: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelSelected');
      }
    },
    labelNoDateSelected: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelNoDateSelected');
      }
    },
    labelCalendar: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelCalendar');
      }
    },
    labelNav: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelNav');
      }
    },
    labelHelp: {
      type: String,
      default: function _default() {
        return getComponentConfig(NAME, 'labelHelp');
      }
    }
  },
  data: function data() {
    var selected = formatYMD(this.value) || '';
    return {
      // Selected date
      selectedYMD: selected,
      // Date in calendar grid that has `tabindex` of `0`
      activeYMD: selected || formatYMD(this.getToday()),
      // Will be true if the calendar grid has/contains focus
      gridHasFocus: false,
      // Flag to enable the `aria-live` region(s) after mount
      // to prevent screen reader "outbursts" when mounting
      isLive: false
    };
  },
  computed: {
    // TODO: Use computed props to convert `YYYY-MM-DD` to `Date` object
    selectedDate: function selectedDate() {
      // Selected as a `Date` object
      return parseYMD(this.selectedYMD);
    },
    activeDate: function activeDate() {
      // Active as a `Date` object
      return parseYMD(this.activeYMD);
    },
    computedMin: function computedMin() {
      return parseYMD(this.min);
    },
    computedMax: function computedMax() {
      return parseYMD(this.max);
    },
    computedWeekStarts: function computedWeekStarts() {
      // `startWeekday` is a prop (constrained to `0` through `6`)
      return Math.max(toInteger(this.startWeekday) || 0, 0) % 7;
    },
    computedLocale: function computedLocale() {
      // Returns the resolved locale used by the calendar
      return resolveLocale(concat(this.locale).filter(identity), 'gregory');
    },
    calendarLocale: function calendarLocale() {
      // This locale enforces the gregorian calendar (for use in formatter functions)
      // Needed because IE 11 resolves `ar-IR` as islamic-civil calendar
      // and IE 11 (and some other browsers) do not support the `calendar` option
      // And we currently only support the gregorian calendar
      var fmt = new Intl.DateTimeFormat(this.computedLocale, {
        calendar: 'gregory'
      });
      var calendar = fmt.resolvedOptions().calendar;
      var locale = fmt.resolvedOptions().locale;
      /* istanbul ignore if: mainly for IE 11 and a few other browsers, hard to test in JSDOM */

      if (calendar !== 'gregory') {
        // Ensure the locale requests the gregorian calendar
        // Mainly for IE 11, and currently we can't handle non-gregorian calendars
        // TODO: Should we always return this value?
        locale = locale.replace(/-u-.+$/i, '').concat('-u-ca-gregory');
      }

      return locale;
    },
    calendarYear: function calendarYear() {
      return this.activeDate.getFullYear();
    },
    calendarMonth: function calendarMonth() {
      return this.activeDate.getMonth();
    },
    calendarFirstDay: function calendarFirstDay() {
      return createDate(this.calendarYear, this.calendarMonth, 1);
    },
    calendarDaysInMonth: function calendarDaysInMonth() {
      // We create a new date as to not mutate the original
      var date = createDate(this.calendarFirstDay);
      date.setMonth(date.getMonth() + 1, 0);
      return date.getDate();
    },
    computedVariant: function computedVariant() {
      return "btn-".concat(this.selectedVariant || 'primary');
    },
    computedTodayVariant: function computedTodayVariant() {
      return "btn-outline-".concat(this.todayVariant || this.selectedVariant || 'primary');
    },
    isRTL: function isRTL() {
      // `true` if the language requested is RTL
      var dir = toString(this.direction).toLowerCase();

      if (dir === 'rtl') {
        /* istanbul ignore next */
        return true;
      } else if (dir === 'ltr') {
        /* istanbul ignore next */
        return false;
      }

      return isLocaleRTL(this.computedLocale);
    },
    context: function context() {
      var selectedYMD = this.selectedYMD;
      var selectedDate = parseYMD(selectedYMD);
      var activeYMD = this.activeYMD;
      var activeDate = parseYMD(activeYMD);
      return {
        // The current value of the `v-model`
        selectedYMD: selectedYMD,
        selectedDate: selectedDate,
        selectedFormatted: selectedDate ? this.formatDateString(selectedDate) : this.labelNoDateSelected,
        // Which date cell is considered active due to navigation
        activeYMD: activeYMD,
        activeDate: activeDate,
        activeFormatted: activeDate ? this.formatDateString(activeDate) : '',
        // `true` if the date is disabled (when using keyboard navigation)
        disabled: this.dateDisabled(activeDate),
        // Locales used in formatting dates
        locale: this.computedLocale,
        calendarLocale: this.calendarLocale,
        rtl: this.isRTL
      };
    },
    // Computed props that return a function reference
    dateOutOfRange: function dateOutOfRange() {
      // Check wether a date is within the min/max range
      // returns a new function ref if the pops change
      // We do this as we need to trigger the calendar computed prop
      // to update when these props update
      var min = this.computedMin;
      var max = this.computedMax;
      return function (date) {
        // Handle both `YYYY-MM-DD` and `Date` objects
        date = parseYMD(date);
        return min && date < min || max && date > max;
      };
    },
    dateDisabled: function dateDisabled() {
      // Returns a function for validating if a date is within range
      // We grab this variables first to ensure a new function ref
      // is generated when the props value changes
      // We do this as we need to trigger the calendar computed prop
      // to update when these props update
      var rangeFn = this.dateOutOfRange;
      var disabledFn = isFunction(this.dateDisabledFn) ? this.dateDisabledFn : function () {
        return false;
      }; // Return the function ref

      return function (date) {
        // Handle both `YYYY-MM-DD` and `Date` objects
        date = parseYMD(date);
        var ymd = formatYMD(date);
        return !!(rangeFn(date) || disabledFn(ymd, date));
      };
    },
    // Computed props that return date formatter functions
    formatDateString: function formatDateString() {
      // Returns a date formatter function
      return createDateFormatter(this.calendarLocale, {
        year: 'numeric',
        month: 'long',
        day: 'numeric',
        weekday: 'long',
        calendar: 'gregory'
      });
    },
    formatYearMonth: function formatYearMonth() {
      // Returns a date formatter function
      return createDateFormatter(this.calendarLocale, {
        year: 'numeric',
        month: 'long',
        calendar: 'gregory'
      });
    },
    formatWeekdayName: function formatWeekdayName() {
      return createDateFormatter(this.calendarLocale, {
        weekday: 'long',
        calendar: 'gregory'
      });
    },
    formatWeekdayNameShort: function formatWeekdayNameShort() {
      // Used as the header cells
      return createDateFormatter(this.calendarLocale, {
        weekday: 'short',
        calendar: 'gregory'
      });
    },
    formatDay: function formatDay() {
      return createDateFormatter(this.calendarLocale, {
        day: 'numeric',
        calendar: 'gregory'
      });
    },
    // Disabled states for the nav buttons
    prevYearDisabled: function prevYearDisabled() {
      var min = this.computedMin;
      return this.disabled || min && lastDateOfMonth(oneYearAgo(this.activeDate)) < min;
    },
    prevMonthDisabled: function prevMonthDisabled() {
      var min = this.computedMin;
      return this.disabled || min && lastDateOfMonth(oneMonthAgo(this.activeDate)) < min;
    },
    thisMonthDisabled: function thisMonthDisabled() {
      // TODO: We could/should check if today is out of range
      return this.disabled;
    },
    nextMonthDisabled: function nextMonthDisabled() {
      var max = this.computedMax;
      return this.disabled || max && firstDateOfMonth(oneMonthAhead(this.activeDate)) > max;
    },
    nextYearDisabled: function nextYearDisabled() {
      var max = this.computedMax;
      return this.disabled || max && firstDateOfMonth(oneYearAhead(this.activeDate)) > max;
    },
    // Calendar generation
    calendar: function calendar() {
      var matrix = [];
      var firstDay = this.calendarFirstDay;
      var calendarYear = firstDay.getFullYear();
      var calendarMonth = firstDay.getMonth();
      var daysInMonth = this.calendarDaysInMonth;
      var startIndex = firstDay.getDay(); // `0`..`6`

      var weekOffset = (this.computedWeekStarts > startIndex ? 7 : 0) - this.computedWeekStarts; // TODO: Change `dateInfoFn` to handle events and notes as well as classes

      var dateInfoFn = isFunction(this.dateInfoFn) ? this.dateInfoFn : function () {
        return {};
      }; // Build the calendar matrix

      var currentDay = 0 - weekOffset - startIndex;

      for (var week = 0; week < 6 && currentDay < daysInMonth; week++) {
        // For each week
        matrix[week] = []; // The following could be a map function

        for (var j = 0; j < 7; j++) {
          // For each day in week
          currentDay++;
          var date = createDate(calendarYear, calendarMonth, currentDay);
          var month = date.getMonth();
          var dayYMD = formatYMD(date);
          var dayDisabled = this.dateDisabled(date); // TODO: This could be a normalizer method

          var dateInfo = dateInfoFn(dayYMD, parseYMD(dayYMD));
          dateInfo = isString(dateInfo) || isArray(dateInfo) ? {
            class: dateInfo
          } : isPlainObject(dateInfo) ? _objectSpread({
            class: ''
          }, dateInfo) : {
            class: ''
          };
          matrix[week].push({
            ymd: dayYMD,
            // Cell content
            day: this.formatDay(date),
            label: this.formatDateString(date),
            // Flags for styling
            isThisMonth: month === calendarMonth,
            isDisabled: dayDisabled,
            // TODO: Handle other dateInfo properties such as notes/events
            info: dateInfo
          });
        }
      }

      return matrix;
    },
    calendarHeadings: function calendarHeadings() {
      var _this = this;

      return this.calendar[0].map(function (d) {
        return {
          text: _this.formatWeekdayNameShort(parseYMD(d.ymd)),
          label: _this.formatWeekdayName(parseYMD(d.ymd))
        };
      });
    }
  },
  watch: {
    value: function value(newVal, oldVal) {
      var selected = formatYMD(newVal) || '';
      var old = formatYMD(oldVal) || '';

      if (!datesEqual(selected, old)) {
        this.activeYMD = selected || this.activeYMD;
        this.selectedYMD = selected;
      }
    },
    selectedYMD: function selectedYMD(newYMD, oldYMD) {
      // TODO:
      //   Should we compare to `formatYMD(this.value)` and emit
      //   only if they are different?
      if (newYMD !== oldYMD) {
        this.$emit('input', this.valueAsDate ? parseYMD(newYMD) || null : newYMD || '');
      }
    },
    context: function context(newVal, oldVal) {
      if (!looseEqual(newVal, oldVal)) {
        this.$emit('context', newVal);
      }
    },
    hidden: function hidden(newVal) {
      // Reset the active focused day when hidden
      this.activeYMD = this.selectedYMD || formatYMD(this.value) || formatYMD(this.getToday()); // Enable/disable the live regions

      this.setLive(!newVal);
    }
  },
  created: function created() {
    var _this2 = this;

    this.$nextTick(function () {
      _this2.$emit('context', _this2.context);
    });
  },
  mounted: function mounted() {
    this.setLive(true);
  },
  activated: function activated()
  /* istanbul ignore next */
  {
    this.setLive(true);
  },
  deactivated: function deactivated()
  /* istanbul ignore next */
  {
    this.setLive(false);
  },
  beforeDestroy: function beforeDestroy() {
    this.setLive(false);
  },
  methods: {
    // Public method(s)
    focus: function focus() {
      if (!this.disabled) {
        try {
          this.$refs.grid.focus();
        } catch (_unused) {}
      }
    },
    blur: function blur() {
      try {
        this.$refs.grid.blur();
      } catch (_unused2) {}
    },
    // Private methods
    setLive: function setLive(on) {
      var _this3 = this;

      if (on) {
        this.$nextTick(function () {
          requestAF(function () {
            _this3.isLive = true;
          });
        });
      } else {
        this.isLive = false;
      }
    },
    getToday: function getToday() {
      return parseYMD(createDate());
    },
    constrainDate: function constrainDate(date) {
      // Constrains a date between min and max
      // returns a new `Date` object instance
      date = parseYMD(date);
      var min = this.computedMin || date;
      var max = this.computedMax || date;
      return createDate(date < min ? min : date > max ? max : date);
    },
    emitSelected: function emitSelected(date) {
      var _this4 = this;

      // Performed in a `$nextTick()` to (probably) ensure
      // the input event has emitted first
      this.$nextTick(function () {
        _this4.$emit('selected', formatYMD(date) || '', parseYMD(date) || null);
      });
    },
    // Event handlers
    setGridFocusFlag: function setGridFocusFlag(evt) {
      // Sets the gridHasFocus flag to make date "button" look focused
      this.gridHasFocus = !this.disabled && evt.type === 'focus';
    },
    onKeydownWrapper: function onKeydownWrapper(evt) {
      // Calendar keyboard navigation
      // Handles PAGEUP/PAGEDOWN/END/HOME/LEFT/UP/RIGHT/DOWN
      // Focuses grid after updating
      var keyCode = evt.keyCode;
      var altKey = evt.altKey;

      if (!arrayIncludes([PAGEUP, PAGEDOWN, END, HOME, LEFT, UP, RIGHT, DOWN], keyCode)) {
        /* istanbul ignore next */
        return;
      }

      evt.preventDefault();
      evt.stopPropagation();
      var activeDate = createDate(this.activeDate);
      var checkDate = createDate(this.activeDate);
      var day = activeDate.getDate();
      var isRTL = this.isRTL;

      if (keyCode === PAGEUP) {
        // PAGEUP - Previous month/year
        activeDate = (altKey ? oneYearAgo : oneMonthAgo)(activeDate); // We check the first day of month to be in rage

        checkDate = createDate(activeDate);
        checkDate.setDate(1);
      } else if (keyCode === PAGEDOWN) {
        // PAGEDOWN - Next month/year
        activeDate = (altKey ? oneYearAhead : oneMonthAhead)(activeDate); // We check the last day of month to be in rage

        checkDate = createDate(activeDate);
        checkDate.setMonth(checkDate.getMonth() + 1);
        checkDate.setDate(0);
      } else if (keyCode === LEFT) {
        // LEFT - Previous day (or next day for RTL)
        activeDate.setDate(day + (isRTL ? 1 : -1));
        checkDate = activeDate;
      } else if (keyCode === RIGHT) {
        // RIGHT - Next day (or previous day for RTL)
        activeDate.setDate(day + (isRTL ? -1 : 1));
        checkDate = activeDate;
      } else if (keyCode === UP) {
        // UP - Previous week
        activeDate.setDate(day - 7);
        checkDate = activeDate;
      } else if (keyCode === DOWN) {
        // DOWN - Next week
        activeDate.setDate(day + 7);
        checkDate = activeDate;
      } else if (keyCode === HOME) {
        // HOME - Today
        activeDate = this.getToday();
        checkDate = activeDate;
      } else if (keyCode === END) {
        // END - Selected date, or today if no selected date
        activeDate = parseYMD(this.selectedDate) || this.getToday();
        checkDate = activeDate;
      }

      if (!this.dateOutOfRange(checkDate) && !datesEqual(activeDate, this.activeDate)) {
        // We only jump to date if within min/max
        // We don't check for individual disabled dates though (via user function)
        this.activeYMD = formatYMD(activeDate);
      } // Ensure grid is focused


      this.focus();
    },
    onKeydownGrid: function onKeydownGrid(evt) {
      // Pressing enter/space on grid to select active date
      var keyCode = evt.keyCode;
      var activeDate = this.activeDate;

      if (keyCode === ENTER || keyCode === SPACE) {
        evt.preventDefault();
        evt.stopPropagation();

        if (!this.disabled && !this.readonly && !this.dateDisabled(activeDate)) {
          this.selectedYMD = formatYMD(activeDate);
          this.emitSelected(activeDate);
        } // Ensure grid is focused


        this.focus();
      }
    },
    onClickDay: function onClickDay(day) {
      // Clicking on a date "button" to select it
      // TODO: Change to lookup the `data-data` attribute
      var selectedDate = this.selectedDate;
      var activeDate = this.activeDate;
      var clickedDate = parseYMD(day.ymd);

      if (!this.disabled && !day.isDisabled && !this.dateDisabled(clickedDate)) {
        if (!this.readonly) {
          // If readonly mode, we don't set the selected date, just the active date
          // If the clicked date is equal to the already selected date, we don't update the model
          this.selectedYMD = formatYMD(datesEqual(clickedDate, selectedDate) ? selectedDate : clickedDate);
          this.emitSelected(clickedDate);
        }

        this.activeYMD = formatYMD(datesEqual(clickedDate, activeDate) ? activeDate : createDate(clickedDate)); // Ensure grid is focused

        this.focus();
      }
    },
    gotoPrevYear: function gotoPrevYear() {
      this.activeYMD = formatYMD(this.constrainDate(oneYearAgo(this.activeDate)));
    },
    gotoPrevMonth: function gotoPrevMonth() {
      this.activeYMD = formatYMD(this.constrainDate(oneMonthAgo(this.activeDate)));
    },
    gotoCurrentMonth: function gotoCurrentMonth() {
      // TODO: Maybe this goto date should be configurable?
      this.activeYMD = formatYMD(this.getToday());
    },
    gotoNextMonth: function gotoNextMonth() {
      this.activeYMD = formatYMD(this.constrainDate(oneMonthAhead(this.activeDate)));
    },
    gotoNextYear: function gotoNextYear() {
      this.activeYMD = formatYMD(this.constrainDate(oneYearAhead(this.activeDate)));
    }
  },
  render: function render(h) {
    var _this5 = this;

    // If hidden prop is set, render just a placeholder node
    if (this.hidden) {
      return h();
    }

    var isRTL = this.isRTL;
    var todayYMD = formatYMD(this.getToday());
    var selectedYMD = this.selectedYMD;
    var activeYMD = this.activeYMD;
    var highlightToday = !this.noHighlightToday;
    var safeId = this.safeId; // Flag for making the `aria-live` regions live

    var isLive = this.isLive; // Pre-compute some IDs

    var idWidget = safeId();
    var idValue = safeId('_calendar-value_');
    var idNav = safeId('_calendar-nav_');
    var idGrid = safeId('_calendar-grid_');
    var idGridCaption = safeId('_calendar-grid-caption_');
    var idGridHelp = safeId('_calendar-grid-help_');
    var idActive = activeYMD ? safeId("_cell-".concat(activeYMD, "_")) : null; // Header showing current selected date

    var $header = h('output', {
      staticClass: 'd-block text-center rounded border small p-1 mb-1',
      class: {
        'text-muted': this.disabled,
        readonly: this.readonly || this.disabled
      },
      attrs: {
        id: idValue,
        for: idGrid,
        role: 'status',
        // Mainly for testing purposes, as we do not know
        // the exact format `Intl` will format the date string
        'data-selected': toString(selectedYMD),
        // We wait until after mount to enable `aria-live`
        // to prevent initial announcement on page render
        'aria-live': isLive ? 'polite' : 'off',
        'aria-atomic': isLive ? 'true' : null
      }
    }, this.selectedDate ? [// We use `bdi` elements here in case the label doesn't match the locale
    // Although IE 11 does not deal with <BDI> at all (equivalent to a span)
    h('bdi', {
      staticClass: 'sr-only'
    }, " (".concat(toString(this.labelSelected), ") ")), h('bdi', {}, this.formatDateString(this.selectedDate))] : this.labelNoDateSelected || "\xA0" // '&nbsp;'
    );
    $header = h('header', {
      class: this.hideHeader ? 'sr-only' : 'mb-1',
      attrs: {
        title: this.selectedDate ? this.labelSelectedDate || null : null
      }
    }, [$header]); // Content for the date navigation buttons

    var $prevYearIcon = h(BIconstack, {
      props: {
        shiftV: 0.5,
        flipH: isRTL
      }
    }, [h(BIconChevronLeft, {
      props: {
        shiftH: -2
      }
    }), h(BIconChevronLeft, {
      props: {
        shiftH: 2
      }
    })]);
    var $prevMonthIcon = h(BIconChevronLeft, {
      props: {
        shiftV: 0.5,
        flipH: isRTL
      }
    });
    var $thisMonthIcon = h(BIconCircleFill, {
      props: {
        shiftV: 0.5
      }
    });
    var $nextMonthIcon = h(BIconChevronLeft, {
      props: {
        shiftV: 0.5,
        flipH: !isRTL
      }
    });
    var $nextYearIcon = h(BIconstack, {
      props: {
        shiftV: 0.5,
        flipH: !isRTL
      }
    }, [h(BIconChevronLeft, {
      props: {
        shiftH: -2
      }
    }), h(BIconChevronLeft, {
      props: {
        shiftH: 2
      }
    })]); // Utility to create the date navigation buttons

    var makeNavBtn = function makeNavBtn(content, label, handler, btnDisabled, shortcut) {
      return h('button', {
        staticClass: 'btn btn-sm btn-outline-secondary border-0 flex-fill p-1 mx-1',
        class: {
          disabled: btnDisabled
        },
        attrs: {
          title: label || null,
          type: 'button',
          'aria-label': label || null,
          'aria-disabled': btnDisabled ? 'true' : null,
          'aria-keyshortcuts': shortcut || null
        },
        on: btnDisabled ? {} : {
          click: handler
        }
      }, [h('div', {
        attrs: {
          'aria-hidden': 'true'
        }
      }, [content])]);
    }; // Generate the date navigation buttons


    var $nav = h('div', {
      staticClass: 'b-calendar-nav d-flex mx-n1 mb-1',
      attrs: {
        id: idNav,
        role: 'group',
        'aria-hidden': this.disabled ? 'true' : null,
        'aria-label': this.labelNav || null,
        'aria-controls': idGrid
      }
    }, [makeNavBtn($prevYearIcon, this.labelPrevYear, this.gotoPrevYear, this.prevYearDisabled, 'Alt+PageDown'), makeNavBtn($prevMonthIcon, this.labelPrevMonth, this.gotoPrevMonth, this.prevMonthDisabled, 'PageDown'), makeNavBtn($thisMonthIcon, this.labelCurrentMonth, this.gotoCurrentMonth, this.thisMonthDisabled, 'Home'), makeNavBtn($nextMonthIcon, this.labelNextMonth, this.gotoNextMonth, this.nextMonthDisabled, 'PageUp'), makeNavBtn($nextYearIcon, this.labelNextYear, this.gotoNextYear, this.nextYearDisabled, 'Alt+PageUp')]); // Caption for calendar grid

    var $gridCaption = h('header', {
      key: 'grid-caption',
      staticClass: 'text-center font-weight-bold p-1 m-0',
      class: {
        'text-muted': this.disabled
      },
      attrs: {
        id: idGridCaption,
        'aria-live': isLive ? 'polite' : null,
        'aria-atomic': isLive ? 'true' : null
      }
    }, this.formatYearMonth(this.calendarFirstDay)); // Calendar weekday headings

    var $gridWeekDays = h('div', {
      staticClass: 'row no-gutters border-bottom',
      attrs: {
        'aria-hidden': 'true'
      }
    }, this.calendarHeadings.map(function (d, idx) {
      return h('small', {
        key: idx,
        staticClass: 'col',
        class: {
          'text-muted': _this5.disabled
        },
        attrs: {
          title: d.label === d.text ? null : d.label,
          'aria-label': d.label
        }
      }, d.text);
    })); // Calendar day grid

    var $gridBody = this.calendar.map(function (week) {
      var $cells = week.map(function (day, dIndex) {
        var _class;

        var isSelected = day.ymd === selectedYMD;
        var isActive = day.ymd === activeYMD;
        var isToday = day.ymd === todayYMD;
        var idCell = safeId("_cell-".concat(day.ymd, "_")); // "fake" button

        var $btn = h('span', {
          staticClass: 'btn border-0 rounded-circle text-nowrap',
          // Should we add some classes to signify if today/selected/etc?
          class: (_class = {
            // Give the fake button a focus ring
            focus: isActive && _this5.gridHasFocus,
            // Styling
            disabled: day.isDisabled || _this5.disabled,
            active: isSelected
          }, _defineProperty(_class, _this5.computedVariant, isSelected), _defineProperty(_class, _this5.computedTodayVariant, isToday && highlightToday && !isSelected && day.isThisMonth), _defineProperty(_class, 'btn-outline-light', !(isToday && highlightToday) && !isSelected && !isActive), _defineProperty(_class, 'btn-light', !(isToday && highlightToday) && !isSelected && isActive), _defineProperty(_class, 'text-muted', !day.isThisMonth && !isSelected), _defineProperty(_class, 'text-dark', !(isToday && highlightToday) && !isSelected && !isActive && day.isThisMonth), _defineProperty(_class, 'font-weight-bold', (isSelected || day.isThisMonth) && !day.isDisabled), _class),
          on: {
            click: function click() {
              return _this5.onClickDay(day);
            }
          }
        }, day.day);
        return h('div', // Cell with button
        {
          key: dIndex,
          staticClass: 'col p-0',
          class: day.isDisabled ? 'bg-light' : day.info.class || '',
          attrs: {
            id: idCell,
            role: 'button',
            'data-date': day.ymd,
            // Primarily for testing purposes
            // Only days in the month are presented as buttons to screen readers
            'aria-hidden': day.isThisMonth ? null : 'true',
            'aria-disabled': day.isDisabled || _this5.disabled ? 'true' : null,
            'aria-label': [day.label, isSelected ? "(".concat(_this5.labelSelected, ")") : null, isToday ? "(".concat(_this5.labelToday, ")") : null].filter(identity).join(' '),
            // NVDA doesn't convey `aria-selected`, but does `aria-current`,
            // ChromeVox doesn't convey `aria-current`, but does `aria-selected`,
            // so we set both attributes for robustness
            'aria-selected': isSelected ? 'true' : null,
            'aria-current': isSelected ? 'date' : null
          }
        }, [$btn]);
      }); // Return the week "row"
      // We use the first day of the weeks YMD value as a
      // key for efficient DOM patching / element re-use

      return h('div', {
        key: week[0].ymd,
        staticClass: 'row no-gutters'
      }, $cells);
    });
    $gridBody = h('div', {
      // A key is only required on the body if we add in transition support
      // key: this.activeYMD.slice(0, -3),
      staticClass: 'b-calendar-grid-body',
      style: this.disabled ? {
        pointerEvents: 'none'
      } : {}
    }, $gridBody);
    var $gridHelp = h('footer', {
      staticClass: 'border-top small text-muted text-center bg-light',
      attrs: {
        id: idGridHelp
      }
    }, [h('div', {
      staticClass: 'small'
    }, this.labelHelp)]);
    var $grid = h('div', {
      ref: 'grid',
      staticClass: 'form-control h-auto text-center p-0 mb-0',
      attrs: {
        id: idGrid,
        role: 'application',
        tabindex: this.disabled ? null : '0',
        'data-month': activeYMD.slice(0, -3),
        // `YYYY-MM`, mainly for testing
        // tabindex: this.disabled ? null : '0',
        'aria-roledescription': this.labelCalendar || null,
        'aria-labelledby': idGridCaption,
        'aria-describedby': idGridHelp,
        // `aria-readonly` is not considered valid on `role="application"`
        // https://www.w3.org/TR/wai-aria-1.1/#aria-readonly
        // 'aria-readonly': this.readonly && !this.disabled ? 'true' : null,
        'aria-disabled': this.disabled ? 'true' : null,
        'aria-activedescendant': idActive
      },
      on: {
        keydown: this.onKeydownGrid,
        focus: this.setGridFocusFlag,
        blur: this.setGridFocusFlag
      }
    }, [$gridCaption, $gridWeekDays, $gridBody, $gridHelp]); // Optional bottom slot

    var $slot = this.normalizeSlot('default');
    $slot = $slot ? h('footer', {
      staticClass: 'mt-2'
    }, $slot) : h();
    var $widget = h('div', {
      class: this.block ? 'd-block' : 'd-inline-block',
      style: this.block ? {} : {
        width: this.width
      },
      attrs: {
        id: idWidget,
        dir: isRTL ? 'rtl' : 'ltr',
        lang: this.computedLocale || null,
        role: 'group',
        'aria-disabled': this.disabled ? 'true' : null,
        // If datepicker controls an input, this will specify the ID of the input
        'aria-controls': this.ariaControls || null,
        // This should be a prop (so it can be changed to Date picker, etc, localized
        'aria-roledescription': this.roleDescription || null,
        'aria-describedby': [// Should the attr (if present) go last?
        // Or should this attr be a prop?
        this.$attrs['aria-describedby'], idValue, idGridHelp].filter(identity).join(' ')
      },
      on: {
        keydown: this.onKeydownWrapper
      }
    }, [$header, $nav, $grid, $slot]); // Wrap in an outer div that can be styled

    return h('div', {
      staticClass: 'b-calendar',
      // We use a style here rather than class `d-inline-block` so that users can
      // override the display value (`d-*` classes use the `!important` flag)
      style: this.block ? {} : {
        display: 'inline-block'
      }
    }, [$widget]);
  }
});