index.js

var outline = require('outline-numbering')

function withinAgreement (numbering) {
  var first = numbering[0]
  return (
    first.series.number === 1 &&
    first.element.number === 1)
}

function withinSchedules (numbering) {
  var first = numbering[0]
  return (
    first.series.number === 1 &&
    first.element.number === 2)
}

function stripNounPrefix (string) {
  return string.replace('Section\u00a0', '')
}

module.exports = function (numbering, shortForm) {
  var length = numbering.length
  if (length < 1) {
    throw new Error('Invalid numbering')
  }
  var first = numbering[0]
  if (withinAgreement(numbering)) {
    if (length === 1) {
      return (shortForm ? 'Agreement.' : 'the Agreement')
    } else {
      return (
        (!shortForm ? 'Section\u00a0' : '') +
        stripNounPrefix(outline(numbering.slice(1), shortForm)) +
        (!shortForm ? ' of the Agreement' : ''))
    }
  } else if (withinSchedules(numbering)) {
    if (length === 1) {
      return (shortForm ? 'Schedules.' : 'Schedules to the Agreement')
    } else {
      var scheduleNumber = (
        'Schedule\u00a0' +
        outline([numbering[1]], shortForm)
          .replace('Section\u00a0', ''))
      if (length === 2) {
        return scheduleNumber
      } else {
        return (
          (!shortForm ? 'Section\u00a0' : '') +
          stripNounPrefix(outline(numbering.slice(2), shortForm)) +
          (!shortForm ? (' of ' + scheduleNumber) : ''))
      }
    }
  } else {
    var inFirstSeries = (numbering[0].series.number === 1)
    var exhibitNumber = (
      'Exhibit\u00a0' +
      stripNounPrefix(
        outline(
          [
            {
              series: {
                number: first.series.number,
                of: first.series.of
              },
              element: {
                number: inFirstSeries
                  ? (first.element.number - 2)
                  : first.element.number,
                of: inFirstSeries
                  ? (first.element.of - 2)
                  : first.element.of
              }
            }
          ],
          shortForm)))
    if (length === 1) {
      return exhibitNumber
    } else {
      return (
        (!shortForm ? 'Section\u00a0' : '') +
        stripNounPrefix(outline(numbering.slice(1), shortForm)) +
        (!shortForm ? (' of ' + exhibitNumber) : ''))
    }
  }
}