String.prototype.score = function(abbreviation,offset) {
  offset = offset || 0
 
  if(abbreviation.length == 0) return 0.9
  if(abbreviation.length > this.length) return 0.0

  for (var i = abbreviation.length; i > 0; i--) {
    var sub_abbreviation = abbreviation.substring(0,i)
    var index = this.indexOf(sub_abbreviation)


    if(index < 0) continue;
    if(index + abbreviation.length > this.length + offset) continue;

    var next_string       = this.substring(index+sub_abbreviation.length)
    var next_abbreviation = null

    if(i >= abbreviation.length)
      next_abbreviation = ''
    else
      next_abbreviation = abbreviation.substring(i)
 
    var remaining_score   = next_string.score(next_abbreviation,offset+index)
 
    if (remaining_score > 0.8) {
      var score = this.length-next_string.length;

      if(index != 0) {
        var j = 0;

        var c = this.charCodeAt(index-1)
        if(c==32 || c == 9) {
          for(var j=(index-2); j >= 0; j--) {
            c = this.charCodeAt(j)
            score -= ((c == 32 || c == 9) ? 1 : 0.15)
          }

       } else {
          score -= index
        }
      }
   
      score += remaining_score * next_string.length
      score /= this.length;
      return score
    }
  }
  return 0.0
}