Feriados Argentina

feriados.js

/*
 * Feriados Argentina
 * 
 * Extrae los feriados de https://www.argentina.gob.ar/interior/feriados
 * Trivialmente adaptable a scripts y/o buena referencia para otros lenguajes.
 * Comentado en inglés porque empezó como parte de un proposal para la API de holidata.
 *
 * Si esto te ahorró unas horas de coding o te fue de ayuda dejá un comentario,
 * pagame un café (?) o escribime un mail!
 *
 */

let holidays = [];

// Gets the year from the title or assumes the current year (what could go wrong?)
const year = document.title.match(/20\d{2}/)[0] || new Date().getFullYear();

// Walk through each month in the calendar
Array.from(document.getElementsByClassName('cont')).forEach((monthCalendar, i) => {
    // Fixed holidays usually land on the same day every year
  const fixedDateHolidaysFilter = 'bg-success';

  // Variable date holidays are moved around every year
  const variableDateHolidaysFilter = 'bg-primary';

  // Optional holidays depend on religion or employment sector
  // and they are usually considered business days
  const optionalHolidaysFilter = 'bg-nl';

  const holidaysByDay = Array.from(monthCalendar.getElementsByTagName('p'))
    .filter(item => item.className.indexOf('text-muted') < 0)
    .map(item => {
      const [_, day, description] = item.textContent.match(/(\d+)\. (.+?)( \(|\.)/);
      return {day, description};
    })
    .reduce((arr, item) => {
      item.day.split(/, ?| y /).forEach(day => {
        arr[parseInt(day)] = item.description;
      });
      return arr;
    }, []);

  const walkHolidayList = (classFilter, options) => {
    const list = monthCalendar.getElementsByClassName(classFilter);

    for (let holiday of list) {
      const day = parseInt(holiday.textContent);
      holidays.push({
        holidayDate: new Date(year, i, day),
        description: holidaysByDay[day],
        isFixed: false,
        isVariable: false,
        isOptional: false,
        ...options,
      });
    }
  };

  walkHolidayList(fixedDateHolidaysFilter, {isFixed: true});
  walkHolidayList(variableDateHolidaysFilter, {isVariable: true});
  walkHolidayList(optionalHolidaysFilter, {isOptional: true});
});

console.log(`Holidays for ${year}`, holidays);