number-to-text/converters/de.js

A number to text converter

const numberToText = require('../index')

const thousands = ['', 'tausend', 'Million', 'Milliarde', 'Billion', 'Billiarde', 'Trillion']
const thousandsPural = ['', 'tausend', 'Millionen', 'Milliarden', 'Billionen', 'Billiarden', 'Trillionen']
const ones = ['', 'ein', 'zwei', 'drei', 'vier', 'fünf', 'sechs', 'sieben', 'acht', 'neun', 'zehn', 'elf', 'zwölf', 'dreizehn', 'vierzehn', 'fünfzehn', 'sechzehn', 'siebzehn', 'achtzehn', 'neunzehn']
const tens = ['', '', 'zwanzig', 'dreißig', 'vierzig', 'fünfzig', 'sechzig', 'siebzig', 'achtzig', 'neunzig']
const cases = ['titleCase', 'lowerCase', 'upperCase', 'toString']
const caseFunctions = [String.prototype.toString, String.prototype.toLowerCase, String.prototype.toUpperCase, String.prototype.toString]

class DeConverter extends numberToText.Converter {
  constructor () {
    super()
    numberToText.addConverter('de', this)
  }

  convertToText (num, options) {
    options = options || {}
    if (options.separator !== '') options.separator = options.separator || ''
    if (cases.indexOf(options.case) === -1) {
      options.case = cases[3]
    }
    const caseFunction = caseFunctions[cases.indexOf(options.case)]

    const valueArray = []
    if (typeof num === 'number' || num instanceof Number) {
      num = num.toString()
    }
    if (num === '0') {
      return caseFunction.call('null')
    }
    let hasThousand = false
    const splittedNumbers = num.match(/.{1,}(?=(...){5}(...)$)|.{1,3}(?=(...){0,5}$)|.{1,3}$/g)
    for (let index = 0; index < splittedNumbers.length; ++index) {
      const splitValues = []
      const splitNum = splittedNumbers[index]
      if (splitNum.length > 3) {
        splitValues.push(module.exports.convertToText(splitNum))
      } else {
        let hnum = ''
        if (splitNum.length === 3 && ones[splitNum.charAt(0)]) {
          hnum += ones[splitNum.charAt(0)] + 'hundert'
        } if (splitNum.length >= 2) {
          if (splitNum.substr(-2, 1) === '1') {
            hnum += ones[splitNum.substr(-2, 2)]
          } else {
            if (ones[splitNum.substr(-1, 1)]) {
              hnum += ones[splitNum.substr(-1, 1)]
            }
            if (tens[splitNum.substr(-2, 1)]) {
              hnum += ones[splitNum.substr(-1, 1)] ? 'und' : ''
              hnum += tens[splitNum.substr(-2, 1)]
            }
          }
        } else {
          hnum += ones[splitNum.charAt(0)]
        }
        if (hnum) {
          if (new RegExp(ones[1] + '$').test(hnum)) hnum += 's'
          splitValues.push(hnum)
        }
      }
      if (thousands[splittedNumbers.length - 1 - index] && splitValues.length > 0) {
        let val
        if ((splittedNumbers.length - 1 - index) === 1) {
          val = splitValues.pop()
          if (val === (ones[1] + 's')) val = ones[1]
          val += thousands[splittedNumbers.length - 1 - index]
          splitValues.push(val)
          hasThousand = true
        } else {
          val = splitValues.pop()
          if (val === (ones[1] + 's')) val = ones[1] + 'e'
          splitValues.push(val)
          if (val === ones[1] + 'e') {
            splitValues.push(thousands[splittedNumbers.length - 1 - index])
          } else {
            splitValues.push(thousandsPural[splittedNumbers.length - 1 - index])
          }
        }
      }
      if (splitValues.length > 0) {
        if (hasThousand && valueArray.length > 0 && (splittedNumbers.length - 1 - index) !== 1) {
          valueArray.push(valueArray.pop() + splitValues.join(' '))
        } else {
          valueArray.push(splitValues.join(' '))
        }
      }
    }
    return caseFunction.call((valueArray.join(options.separator + ' ')))
  }
}
module.exports = new DeConverter()