My compiler is COMPLETELY messed up, any help?

Question

So I have made a simple compiler in C#. It works by this. (website link) And here is my source code:
NOTICE: I get no errors it just does, well, it does not compile.
using System;
using System.IO;
using System.Text;

class Class
{
    static void Main()
    {
        string path = @"c:\temp\SCRIPT.vis";

        char previous;
        string all = "";
        string cmd = "";
        string scpy;
        int mode = 0;
        string aug2 = "";

        Stream s = new FileStream(@"data.vis", FileMode.Open);
        int val = 0;
        char ch;

        while (true)
        {
            val = s.ReadByte();

            if (val < 0)
                break;
            ch = (char)val;
            Console.Write(ch);
            if (mode == 0)
            {
                if (ch != '(')
                {
                    all = ch.ToString();


                }
                else
                {
                    mode = 1;
                    all = "";

                }
            }
            if (mode == 1)
            {
                cmd = all;
                all = "";
                all = ch.ToString();
            }
            if (ch == ',')
            {
                mode = 2;
                all = "";
            }
            if (mode == 2)
            {
                aug2 = all;
                all = ch.ToString();
            }
            if (ch == ')')
            {
                if (cmd == "embed")
                {
                    File.Copy("C:/Visix/Embeds/" + all, all);
                }
                if (cmd == "copy")
                {
                    File.AppendAllText(@"main.vis", "File.Copy(" + all + ", " + aug2 + ");" + Environment.NewLine);
                }
                if (cmd == "using")
                {
                    File.AppendAllText(@"main.vis", "using " + all + Environment.NewLine);
                }
                if (cmd == "fileAppend")
                {
                    File.AppendAllText(@"main.vis", "File.AppendAllText(@" + all + ',' + aug2 + " + Environment.NewLine);" + Environment.NewLine);
                }
                if (cmd == "print")
                {
                    Console.WriteLine(all);
                }

            }
        }
        Console.WriteLine();
    }
}

Answer 1

Ah I see - when you have a print call in your data.vis it doesn't print anything in the compiler program, but when you call copy from your compiler program it does create main.vis but the file contains File.Copy("@"C:/test.txt", "C:/output.txt");?

There's an extra leading double quote there before the @ - is that the issue you're trying to solve?

I've not done much compiler work myself but from what I've seen the common pattern is to split the process into "lexing" to find meaningful tokens from the stream of characters, then "parsing" to produce language constructs based on the tokens.

Here's how I'd be tempted to structure it: https://pastebin.com/xbtv2WYG