如何读取lgo文件上的文本（例如，Turtle Graphics的左，右等）

Question

我需要创建一个应用程序，该应用程序将解释Logo编程语言的子集并在Logo程序中执行操作。我的应用程序将读取徽标程序并在程序内执行操作。徽标程序的每一行仅包含1个徽标命令。我无法访问或看到徽标文件，并且不知道如何读取此lgo文件的内容。

这些是给出的命令：

左：将乌龟的方向向左旋转90度

右：将乌龟的方向向右旋转90度

Tail：如果尾巴向上，则放下，反之亦然

Step：将乌龟沿当前方向移动1步

{
    //Direction values
    const int NORTH = 0;
    const int EAST = 90;
    const int SOUTH = 180;
    const int WEST = 270;

    //Amount to move the turtle 1 step
    const int STEP_AMOUNT = 50;

    //Amount to add to direction when turning
    const int TURN_AMOUNT = EAST;

    //Set direction of turtle to East
    int direction = 90;
    //Status of the tail
    bool isTailUp = true;
    //Current x and y position of the turtle
    Point turtlePos = new Point(0, 0);

    //Filter constant
    const string FILTER = "All Files|*.*|Logo Program Files|*.lgo";

    StreamReader reader;

    public Form1()
    {
        InitializeComponent();
    }

    /// <summary>
    /// Initialises the application to it's initial state.
    /// </summary>
    private void Initialise()
    {
        pictureBoxDisplay.Refresh();
        direction = 90;
        isTailUp = true;
        turtlePos = new Point(0, 0);
    }

    /// <summary>
    /// Turns the direction of the turtle 90 degrees to the left.
    /// </summary>
    private void Left()
    {
        //If direction is north then set to west, otherwise just subtract 
        //the turn amount from the current direction
        if (direction == NORTH)
        {
            direction = WEST;
        }
        else
        {
            direction -= TURN_AMOUNT;
        }
    }

    /// <summary>
    /// Turns the direction of the turtle 90 degrees to the right
    /// </summary>
    private void Right()
    {
        //If direction is west then set to north, otherwise just add 
        //the turn amount to the current direction
        if (direction == WEST)
        {
            direction = NORTH;
        }
        else
        {
            direction += TURN_AMOUNT;
        }
    }

    /// <summary>
    /// Toggles the state of the tail.
    /// </summary>
    private void Tail()
    {
        isTailUp = !isTailUp;
    }

    /// <summary>
    /// Works out the new position of the turtle when doing a step
    /// based on the current direction of the turtle.
    /// </summary>
    /// <returns>The new position of the turtle after doing a step</returns>
    private Point NewTurtlePos()
    {
        //Create the new position at the current turtle position
        Point newPos = new Point(turtlePos.X, turtlePos.Y);

        //Change the x or y position based on the direction
        if (direction == NORTH)
        {
            newPos.Y -= STEP_AMOUNT;
        }
        else if (direction == SOUTH)
        {
            newPos.Y += STEP_AMOUNT;
        }
        else if (direction == WEST)
        {
            newPos.X -= STEP_AMOUNT;
        }
        else
        {
            newPos.X += STEP_AMOUNT;
        }

        return newPos;
    }

    /// <summary>
    /// Make the turtle move by 1 step in the current direction.
    /// </summary>
    /// <param name="paper">Where to draw the graphics</param>
    private void Step(Graphics paper)
    {
        Pen pen1 = new Pen(Color.Black, 5);

        //Get the new position of the turtle after doing the step
        Point newPos = NewTurtlePos();

        if (isTailUp == true)
        {
            //If the tail is up then just move the turtle to the new position
            turtlePos = newPos;
        }
        else
        {
            //If the tail is down then draw a line to the new position and then
            //move the turtle to the new position.
            paper.DrawLine(pen1, turtlePos, newPos);
            turtlePos = newPos;
        }
    }

    private void openLogoProgramToolStripMenuItem_Click(object sender, EventArgs e)
    {
        openFileDialog1.Filter = FILTER;
        //show dialog control and check if user clicked on the open button
        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            //Open selected file
            reader = File.OpenText(openFileDialog1.FileName);

            //repeat while it is not end of file
            while (!reader.EndOfStream)
            {
                //Read line from file
                if (string == )
                {

                }
            }


            //close file
            reader.Close();
        }
    }
}

我不太确定如何知道/读取lgo文件是否读取'left'，'right'，'step'等。然后执行命令，直到到达文件末尾。

例如：如果命令已离开，则调用Left方法，如果命令是步骤，然后调用Step方法，等等

最终，应用程序将绘制徽标程序上的所有命令。

任何帮助将不胜感激！谢谢！ ：）

Answer 1

以下代码将帮助您入门！当心它应该区分大小写...

System.IO.StreamReader file = new System.IO.StreamReader(openFileDialog1.FileName);
string line;
while ((line = file.ReadLine()) != null)
{
    System.Console.WriteLine(line);
    this.GetType().GetMethod(line.Trim())?.Invoke(this, null);
}
file.Close();

欢呼声