gtfs-alerts-utils/lib/timeRanges.js

Utilities to work with GTFSrt Alerts

'use strict';

exports.getEarliestStartDate = (entity) => {
  const alert = entity.alert;
  if (alert) {
    const activePeriod = alert.activePeriod;
    if (activePeriod) {
      if (activePeriod.length === 0) {
        return undefined;
      }

      let earliestStartDate = Number.MAX_SAFE_INTEGER;
      for (const timeRange of alert.activePeriod) {
        if (!timeRange.start || parseInt(timeRange.start) === 0) { // 0 is the default value
          return undefined; // Undefined time range, return this immediately
        } else if (earliestStartDate > timeRange.start) {
          earliestStartDate = timeRange.start;
        }
      }
      return earliestStartDate;
    }
  }

  return undefined;
};

exports.getLatestEndDate = (entity) => {
  const alert = entity.alert;
  if (alert) {
    const activePeriod = alert.activePeriod;
    if (activePeriod) {
      if (activePeriod.length === 0) {
        return undefined;
      }

      let latestEndDate = 0;
      for (const timeRange of alert.activePeriod) {
        if (!timeRange.end || parseInt(timeRange.end) === 0) { // 0 is the default value
          return undefined; // Undefined time range, return this immediately
        } else if (latestEndDate < timeRange.end) {
          latestEndDate = timeRange.end;
        }
      }
      return latestEndDate;
    }
  }

  return undefined;
};