gistfile1.js

var _ = require('lodash');

var rW = "0-9a-zа-я",
  rSpace = /[\s_]+/g,
  rFeat = rFeatSoft = new RegExp('[^'+rW+']((?:featuring|feat|ft|&|vs|при уч|п\.у\.)[^'+rW+']+)', 'g'),
  rU = /[ù-üийі]/g,
  rE = /[è-ëёеє]/g,
  rI = /[ì-ï]/g,
  rA = /[à-æ]/g,
  rO = /[ò-ö]/g,
  rHyphen = /[\u2010-\u2014\u2043\uFE63]/g,
  rDots = /\.+/g,
  trimsym = '[-.ツ•٠·۰˙°*۩†๑٩۶ღ~!?#\'\"\\s]',
  rTrim = new RegExp("^"+trimsym+"+|"+trimsym+"+$", 'g'),
  rCapDot = /([A-ZА-Я])\./g,// надо подумать над п.р.о.п.и.с.н.ы.м.и. буквами
  braces = [
    '\\(+([^\\)]*)\\)+',
    '\\[+([^\\]]*)\\]+',
    '\\{+([^\\}]*)\\}+',
  ],
  rBraces = new RegExp("(" +braces.join("|") + ")", 'g'),
  rBraceOnly = new RegExp('^(?:'+braces.join('|')+')$'),
  clearRanges = [
    '[\u0080-\u00BF]',
    '[\u0300-\u036F]',
    '[\u2100-\u2BFF]',
    '\uD83C[\uDF00-\uDFFF]',  //  U+1F300 to U+1F3FF
    '\uD83D[\uDC00-\uDFFF]',  //  U+1F400 to U+1F7FF
  ],
  rClear = new RegExp(clearRanges.join('|'), 'g'),
  rBreak = new RegExp('[-:;#&!?,.\\s]+'),
  rSplit = /[-&\s;,.]+/,
  rThe = /(\bthe\s|\sthe\b)/g,
  rJoinedComma = /([а-яa-z0-9]),([a-zа-я])/g,
  rPunc = /[‘’′‵'`´;]|,(\s)/g;


function _simpChars(str){
  return str
    .replace(rU, 'u')
    .replace(rE, 'e')
    .replace(rI, 'i')
    .replace(rA, 'a')
    .replace(rO, 'o')
    .replace(rHyphen, '-')
}

function stripAlbum(str){
  return _simpChars(str.replace(rCapDot, '$1').toLowerCase())
    .replace(rBraceOnly, '$1$2$3')
    //.replace(rBraces, ' ')
    .replace(rJoinedComma, '$1 $2')
    .replace(rPunc, '$1')
    .replace(/\s?\((.+)\)/g, function(match, group){
      return group.split(rBreak)
        .map(function(w){ return w.substr(0,4) })
        .join(" ").toUpperCase();
    })
    .split(rBreak).join(' ')
    .replace(rClear, ' ')
    .replace(rSpace, ' ')
    .replace(rDots, '.')
    .replace(rTrim, '');
}

function stripTitle(str){
  return _simpChars(str.replace(rCapDot, '$1').toLowerCase())
    .replace(rBraceOnly, '$1$2$3')
    //.replace(rBraces, ' ')
    .replace(rJoinedComma, '$1 $2')
    .replace(rPunc, '$1')
    .replace(/\s?\((.+)\)/g, function(match, group){
      return group.split(rBreak)
        .map(function(w){ return w.substr(0,1) })
        .join("").toUpperCase();
    })
    .split(rBreak).join(' ')
    .replace(rClear, ' ')
    .replace(rSpace, ' ')
    .replace(rDots, '.')
    .replace(rTrim, '');
}

module.exports = {
  stripTitle: stripTitle,
  stripAlbum: stripAlbum
};