Brainfuck is a mini programming language that has only 8 keywords, i.e. 8 types of operations expressed by 8 characters. In [here], the Brainfuck is introduced and a python interpreter is presented. Following this link, you will be able to interpret the source code of Brainfuck programming language online.
Today, in order to practice my C# programming, I wrote the following C# Console application (using .NET framework 4.0), which also reviews the Brainfuck programming language.
/*
* Author: Dr justyy
* Website: https://HelloACM.com
* Website: https://rot47.net
* Version: 0.1
* BrainFuck Interpreter
*
*/
using System;
using System.IO;
namespace BrainFuck
{
class BrainFuckInterpreter
{
private static string VER = "0.0.0.1";
private static readonly int BUFSIZE = 65535;
private int[] buf = new int[BUFSIZE];
private int ptr { get; set; }
private bool echo { get; set; }
public BrainFuckInterpreter()
{
this.ptr = 0;
this.Reset();
}
public static void PrintHelp()
{
Console.WriteLine("BrainFuck Interpreter " + VER);
Console.WriteLine("https://helloacm.com");
Console.WriteLine("Parameter: -h: Print Help");
Console.WriteLine("Parameter: -e: Enable Echo Input Text");
Console.WriteLine("Parameter: -d: Disable Echo Input Text");
Console.WriteLine("Parameter: -p: Enable Keyboard Input");
Console.WriteLine("Parameter: -v: Print Version");
Console.WriteLine("Parameter: FileName");
}
public void Reset()
{
Array.Clear(this.buf, 0, this.buf.Length);
}
public void Interpret(string s)
{
int i = 0;
int right = s.Length;
while (i < right)
{
switch (s[i])
{
case '>':
{
this.ptr++;
if (this.ptr >= BUFSIZE)
{
this.ptr = 0;
}
break;
}
case '<':
{
this.ptr--;
if (this.ptr < 0)
{
this.ptr = BUFSIZE - 1;
}
break;
}
case '.':
{
Console.Write((char)this.buf[this.ptr]);
break;
}
case '+':
{
this.buf[this.ptr]++;
break;
}
case '-':
{
this.buf[this.ptr]--;
break;
}
case '[':
{
if (this.buf[this.ptr] == 0)
{
int loop = 1;
while (loop > 0)
{
i ++;
char c = s[i];
if (c == '[')
{
loop ++;
}
else
if (c == ']')
{
loop --;
}
}
}
break;
}
case ']':
{
int loop = 1;
while (loop > 0)
{
i --;
char c = s[i];
if (c == '[')
{
loop --;
}
else
if (c == ']')
{
loop ++;
}
}
i --;
break;
}
case ',':
{
// read a key
ConsoleKeyInfo key = Console.ReadKey(this.echo);
this.buf[this.ptr] = (int)key.KeyChar;
break;
}
}
i++;
}
}
static void Main(string[] args)
{
if (args.Length == 0)
{
Console.WriteLine("Try -h, Thanks!");
}
else
{
BrainFuckInterpreter bf = new BrainFuckInterpreter();
foreach (string s in args)
{
if (s[0] == '-') // switch options
{
for (int i = 1; i < s.Length; i++)
{
switch (s[i])
{
case 'h':
{
PrintHelp();
break;
}
case 'd':
{
bf.echo = false;
break;
}
case 'v':
{
Console.WriteLine(VER);
break;
}
case 'e':
{
bf.echo = true;
break;
}
case 'p':
{
string src = Console.In.ReadToEnd();
bf.Interpret(src);
break;
}
}
}
}
else
{
if (File.Exists(s))
{
bf.Interpret(File.ReadAllText(s));
}
else
{
Console.WriteLine("File Open Error: " + s);
}
}
}
}
}
}
}
The above source code can be download at github: and the program looks like following.
The pre-compiled .NET 4.0 Console application can be download [here]. The interpreter can take a parameter that specifies the input source file or it can be used in parameter -p to take inputs at runtime from the stdin. This is useful and can be used in pipeline or redirection. e.g. brainfuck.exe < source.
–EOF (The Ultimate Computing & Technology Blog) —
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