code: function checkFunctionsList(i) {
    let d = 0; // Number of dots
    let l;
  
    if (i >= tokensLength) return 0;
  
    if (l = checkFunction(i)) i += l;
    else return 0;
  
    while (i < tokensLength && tokens[i].type === TokenType.FullStop) {
      d++;
      i++;
    }
  
    return d === 3 ? l + d : 0;
  }
docs: Check if token is part of a functions list (e.g. `function(value)...`).
  @param {Number} i Token's index number
  @returns {Number}