module.exports = function htmlentities(string, quoteStyle, charset, doubleEncode) {
  //  discuss at: https://locutus.io/php/htmlentities/
  // original by: Kevin van Zonneveld (https://kvz.io)
  //  revised by: Kevin van Zonneveld (https://kvz.io)
  //  revised by: Kevin van Zonneveld (https://kvz.io)
  // improved by: nobbler
  // improved by: Jack
  // improved by: Rafał Kukawski (https://blog.kukawski.pl)
  // improved by: Dj (https://locutus.io/php/htmlentities:425#comment_134018)
  // bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  // bugfixed by: Brett Zamir (https://brett-zamir.me)
  //    input by: Ratheous
  //      note 1: function is compatible with PHP 5.2 and older
  //   example 1: htmlentities('Kevin & van Zonneveld')
  //   returns 1: 'Kevin & van Zonneveld'
  //   example 2: htmlentities("foo'bar","ENT_QUOTES")
  //   returns 2: 'foo'bar'

  const getHtmlTranslationTable = require('../strings/get_html_translation_table')
  const hashMap = getHtmlTranslationTable('HTML_ENTITIES', quoteStyle)

  string = string === null ? '' : string + ''

  if (!hashMap) {
    return false
  }

  if (quoteStyle && quoteStyle === 'ENT_QUOTES') {
    hashMap["'"] = '''
  }

  doubleEncode = doubleEncode === null || !!doubleEncode

  const regex = new RegExp(
    '&(?:#\\d+|#x[\\da-f]+|[a-zA-Z][\\da-z]*);|[' +
      Object.keys(hashMap)
        .join('')
        // replace regexp special chars
        .replace(/([()[\]{}\-.*+?^$|/\\])/g, '\\$1') +
      ']',
    'g',
  )

  return string.replace(regex, function (ent) {
    if (ent.length > 1) {
      return doubleEncode ? hashMap['&'] + ent.substr(1) : ent
    }

    return hashMap[ent]
  })
}