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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | /* * 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); } } } } } } } |
/*
* 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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