whole_func_string: function _positionForIndex(index) {
      var textTillIndex = el.value.substring(0,index);
      var row = (textTillIndex.match(/\n/g) || []).length + 1;
      var col = textTillIndex.length - textTillIndex.lastIndexOf("\n");
  
      return {
        row: row,
        column: col
      }
    }
func_code_string: function _positionForIndex(index) {
      var textTillIndex = el.value.substring(0,index);
      var row = (textTillIndex.match(/\n/g) || []).length + 1;
      var col = textTillIndex.length - textTillIndex.lastIndexOf("\n");
  
      return {
        row: row,
        column: col
      }
    }
func_documentation_string: Returns textarea row and column position for certain index
  @param {Number} index text index
  @returns {{row: Number, col: Number}}