You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: Stroke.m
    path of file: ./repos/BPL/classes
    
    the code of the file until where you have to start completion: classdef Stroke < BetterHandle
    %
    % STROKETOKEN Random variables that define a continuous pen trajectory
    %   Utilized in the MotorProgram class
    %
    % Reference 
    
function motor = get.motor(this)
        % compute the [x,y,t] trajectory of this stroke, either from cached
        % item or from scratch
            assert(this.onListener);
            if this.cache_current
                 motor = this.cache_motor;
            else            
                [motor,motor_spline] = vanilla_to_motor(this.shapes_token,this.invscales_token,this.pos_token);
                this.cache_motor = motor;
                this.cache_motor_spline = motor_spline;
                this.cache_current = true;
            end