devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (cjs/__internal/scheduler/recurrence/generate_dates.js)
* Version: 25.2.3
* Build date: Fri Dec 12 2025
*
* Copyright (c) 2012 - 2025 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.generateDates = void 0;
var _date = require("../../core/utils/date");
var _rrule = require("rrule");
var _m_utils_time_zone = _interopRequireDefault(require("../m_utils_time_zone"));
var _base = require("./base");
var _validate_rule = require("./validate_rule");
function _interopRequireDefault(e) {
return e && e.__esModule ? e : {
default: e
}
}
const {
addOffsets: addOffsets
} = _date.dateUtilsTs;
const MS_IN_HOUR = 36e5;
const MS_IN_DAY = 864e5;
const RRULE_BROKEN_TIMEZONES = ["Etc/GMT-13", "MIT", "Pacific/Apia", "Pacific/Enderbury", "Pacific/Tongatapu", "Etc/GMT-14", "Pacific/Kiritimati"];
const getRruleParams = options => {
const {
start: start,
min: min,
max: max,
appointmentTimezoneOffset: appointmentTimezoneOffset
} = options;
const clientOffsets_startDate = _m_utils_time_zone.default.getClientTimezoneOffset(start),
clientOffsets_minViewDate = _m_utils_time_zone.default.getClientTimezoneOffset(min),
clientOffsets_maxViewDate = _m_utils_time_zone.default.getClientTimezoneOffset(max);
const duration = options.end ? options.end.getTime() - options.start.getTime() : 0;
const startIntervalDate = addOffsets(options.start, -clientOffsets_startDate, appointmentTimezoneOffset);
const minViewTime = options.min.getTime() - clientOffsets_minViewDate + appointmentTimezoneOffset;
const minViewDate = new Date(minViewTime - duration);
const maxViewDate = addOffsets(options.max, -clientOffsets_maxViewDate, appointmentTimezoneOffset);
const startDateDSTDifferenceMs = _m_utils_time_zone.default.getDiffBetweenClientTimezoneOffsets(options.start, startIntervalDate);
const switchToSummerTime = startDateDSTDifferenceMs < 0;
return {
startIntervalDate: startIntervalDate,
minViewTime: minViewTime,
minViewDate: minViewDate,
maxViewDate: maxViewDate,
startIntervalDateDSTShift: switchToSummerTime ? 0 : startDateDSTDifferenceMs,
appointmentDuration: duration
}
};
const getLocalMachineOffset = rruleDate => {
const machineTimezoneOffset = _m_utils_time_zone.default.getClientTimezoneOffset(rruleDate);
const machineTimezoneName = _m_utils_time_zone.default.getMachineTimezoneName();
const result = [machineTimezoneOffset];
const isTimezoneOffsetInBrokenRange = machineTimezoneOffset / 36e5 <= -13;
const isTimezoneNameInBrokenNames = !machineTimezoneName || RRULE_BROKEN_TIMEZONES.some((timezone => machineTimezoneName.includes(timezone)));
if (isTimezoneOffsetInBrokenRange && isTimezoneNameInBrokenNames) {
result.push(-864e5)
}
return result
};
const convertRruleResult = (rruleIntervalParams, options, rruleDate) => {
const convertedBackDate = addOffsets(rruleDate, ...getLocalMachineOffset(rruleDate), -options.appointmentTimezoneOffset, rruleIntervalParams.startIntervalDateDSTShift);
const convertedDateDSTShift = _m_utils_time_zone.default.getDiffBetweenClientTimezoneOffsets(convertedBackDate, rruleDate);
const switchToSummerTime = convertedDateDSTShift < 0;
const resultDate = addOffsets(convertedBackDate, convertedDateDSTShift);
const resultDateDSTShift = _m_utils_time_zone.default.getDiffBetweenClientTimezoneOffsets(resultDate, convertedBackDate);
if (resultDateDSTShift && switchToSummerTime) {
return new Date(resultDate.getTime() + resultDateDSTShift)
}
return resultDate
};
const createRRule = (options, startDateUtc, until) => {
const ruleOptions = _rrule.RRule.parseString(String(options.rule));
const {
firstDayOfWeek: firstDayOfWeek
} = options;
ruleOptions.dtstart = startDateUtc;
if (!ruleOptions.wkst && firstDayOfWeek) {
const weekDayNumbers = [6, 0, 1, 2, 3, 4, 5];
ruleOptions.wkst = weekDayNumbers[firstDayOfWeek]
}
if (until) {
ruleOptions.until = addOffsets(until, -_m_utils_time_zone.default.getClientTimezoneOffset(until), options.appointmentTimezoneOffset)
}
const rRuleSet = new _rrule.RRuleSet;
const rRule = new _rrule.RRule(ruleOptions);
rRuleSet.rrule(rRule);
if (options.exception) {
const exceptionStrings = options.exception;
const exceptionDates = exceptionStrings.split(",").map((rule => (0, _base.getDateByAsciiString)(rule))).filter(Boolean);
exceptionDates.forEach((date => {
const rruleTimezoneOffsets = "function" === typeof options.getExceptionDateTimezoneOffsets ? options.getExceptionDateTimezoneOffsets(date) : [-_m_utils_time_zone.default.getClientTimezoneOffset(date), options.appointmentTimezoneOffset];
const exceptionDateInPseudoUtc = addOffsets(date, ...rruleTimezoneOffsets);
rRuleSet.exdate(exceptionDateInPseudoUtc)
}))
}
return rRuleSet
};
const generateDates = options => {
if (!options.rule) {
return []
}
const rule = (0, _base.parseRecurrenceRule)(options.rule);
const isValid = (0, _validate_rule.validateRRuleObject)(rule, options.rule);
if (!isValid) {
return []
}
const rruleIntervalParams = getRruleParams(options);
const {
startIntervalDate: startIntervalDate,
maxViewDate: maxViewDate,
minViewDate: minViewDate,
minViewTime: minViewTime,
appointmentDuration: appointmentDuration
} = rruleIntervalParams;
const rRuleSet = createRRule(options, startIntervalDate, rule.until);
return rRuleSet.between(minViewDate, maxViewDate, true).filter((date => date.getTime() + appointmentDuration >= minViewTime)).map((date => convertRruleResult(rruleIntervalParams, options, date)))
};
exports.generateDates = generateDates;