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Whitespace.cs
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Whitespace.cs
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/*
* Whitespace Interpreter
* Copyright (C) 2010 RoliSoft
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.Collections.Generic;
using System.Text;
namespace RoliSoft.Interpreters
{
public class Whitespace : IInterpreter, IDisassembler
{
public event PrintCharEventHandler PrintChar = Console.Write;
public event PrintStringEventHandler PrintString = Console.WriteLine;
public event ReadCharEventHandler ReadChar = () => Console.ReadKey().KeyChar;
public event ReadStringEventHandler ReadString = Console.ReadLine;
private readonly List<string> _cmds = new List<string>
{ " ", " \n ", " \n\t", " \n\n", "\t ", "\t \t", "\t \n", "\t \t ", "\t \t\t", "\t\t ", "\t\t\t", "\n ", "\n \t", "\n \n", "\n\t ", "\n\t\t", "\n\t\n", "\n\n\n", "\t\n ", "\t\n \t", "\t\n\t ", "\t\n\t\t" };
private readonly Dictionary<string, bool> _params = new Dictionary<string, bool>
{ // This is a list of the commands that take a parameter, and whether they're signed.
{" ", true},
{"\n ", false},
{"\n \t", false},
{"\n \n", false},
{"\n\t ", false},
{"\n\t\t", false}
};
private readonly Dictionary<string, string> _tr = new Dictionary<string, string>
{
{" ", "push"},
{" \n ", "dup"},
{" \n\t", "swap"},
{" \n\n", "pop"},
{"\t ", "add"},
{"\t \t", "sub"},
{"\t \n", "mul"},
{"\t \t ", "div"},
{"\t \t\t", "mod"},
{"\t\t ", "store"},
{"\t\t\t", "retr"},
{"\n ", "label"},
{"\n \t", "call"},
{"\n \n", "jmp"},
{"\n\t ", "jz"},
{"\n\t\t", "jn"},
{"\n\t\n", "ret"},
{"\n\n\n", "exit"},
{"\t\n ", "outchar"},
{"\t\n \t", "outnum"},
{"\t\n\t ", "readchar"},
{"\t\n\t\t", "readnum"}
};
private StackList<long> _stack;
private StackList<int> _callstack;
private Dictionary<long, long> _heap;
private Dictionary<string, int> _labels;
private enum State
{
Command,
Parameter
}
/// <summary>
/// Loops through the specified Whitespace code and runs it.
/// </summary>
/// <param name="src">The Whitespace code.</param>
/// <returns>Returns the results of the code run.</returns>
public unsafe void Run(string src)
{
var length = src.Length;
string cmd = String.Empty, param = String.Empty;
var ls = State.Command;
_stack = new StackList<long>();
_callstack = new StackList<int>();
_heap = new Dictionary<long, long>();
_labels = new Dictionary<string, int>();
fixed (char* app = src)
{
for (var i = 0; i != length; i++)
{
if (app[i] != ' ' && app[i] != '\t' && app[i] != '\n')
{
continue;
}
if (ls == State.Command)
{
cmd += app[i];
if (_cmds.Contains(cmd))
{
if (_params.ContainsKey(cmd))
{
ls = State.Parameter;
}
else
{
cmd = param = String.Empty;
}
}
continue;
}
if (ls == State.Parameter)
{
if (app[i] != '\n')
{
param += app[i];
}
else
{
if(cmd == "\n ")
{
_labels[param] = i;
}
cmd = param = String.Empty;
ls = State.Command;
}
continue;
}
}
for (var i = 0; i != length; i++)
{
if (app[i] != ' ' && app[i] != '\t' && app[i] != '\n')
{
continue;
}
if (ls == State.Command)
{
cmd += app[i];
if (_cmds.Contains(cmd))
{
if (_params.ContainsKey(cmd))
{
ls = State.Parameter;
}
else
{
var res = RunInstruction(cmd, i);
if (res != null)
{
if (res.Type == ResultType.Jump)
{
i = res.Value;
}
if (res.Type == ResultType.End)
{
break;
}
}
cmd = param = String.Empty;
}
}
continue;
}
if (ls == State.Parameter)
{
if (app[i] != '\n')
{
param += app[i];
}
else
{
var res = _params[cmd] ? RunInstruction(cmd, i, ParseNumber(param)) : RunInstruction(cmd, i, param);
if (res != null)
{
if (res.Type == ResultType.Jump)
{
i = res.Value;
}
if (res.Type == ResultType.End)
{
break;
}
}
cmd = param = String.Empty;
ls = State.Command;
}
continue;
}
}
}
}
/// <summary>
/// Disassembles the specified Whitespace code into an assembly-like language.
/// </summary>
/// <param name="src">The Whitespace code.</param>
/// <returns>Returns the disassembled code.</returns>
public unsafe string Disassemble(string src)
{
var length = src.Length;
string cmd = String.Empty, param = String.Empty;
var ls = State.Command;
var sb = new StringBuilder();
fixed (char* app = src)
{
for (var i = 0; i != length; i++)
{
if (app[i] != ' ' && app[i] != '\t' && app[i] != '\n')
{
continue;
}
if (ls == State.Command)
{
cmd += app[i];
if (_cmds.Contains(cmd))
{
if (_params.ContainsKey(cmd))
{
ls = State.Parameter;
}
else
{
sb.AppendLine("[" + i.ToString("0000") + "] " + _tr[cmd] + " ");
cmd = param = String.Empty;
}
}
continue;
}
if (ls == State.Parameter)
{
if (app[i] != '\n')
{
param += app[i];
}
else
{
if (_params[cmd])
{
var tmp = ParseNumber(param);
sb.AppendLine("[" + i.ToString("0000") + "] " + _tr[cmd] + " " + tmp + (!char.IsControl((char)tmp) ? " ; ascii: " + (char)tmp : String.Empty));
}
else
{
sb.AppendLine("[" + i.ToString("0000") + "] " + _tr[cmd] + " " + param.Replace(' ', '0').Replace('\t', '1').Replace('\n', 'n').Substring(0, param.Length < 60 ? param.Length : 60) + (param.Length > 60 ? "..." : String.Empty));
}
cmd = param = String.Empty;
ls = State.Command;
}
continue;
}
}
}
return sb.ToString();
}
private long ParseNumber(string param)
{
var bin = String.Empty;
for (var i = 1; i != param.Length; i++)
{
if (param[i] == ' ')
{
bin += "0";
}
if (param[i] == '\t')
{
bin += "1";
}
if (param[i] == '\n')
{
break;
}
}
var num = Convert.ToInt64(bin, 2);
if (param[0] == '\t')
{
return num * -1;
}
return num;
}
private Result RunInstruction(string cmd, int location, dynamic param = null)
{
switch (cmd)
{
// -- Stack Manipulation --
// Push
case " ":
_stack.Push(param);
break;
// Duplicate
case " \n ":
_stack.Push(_stack.Peek());
break;
// Copy n-th to top
case " \t ":
_stack.Push(_stack[(int)param]);
break;
// Swap
case " \n\t":
var s1 = _stack.Pop();
var s2 = _stack.Pop();
_stack.Push(s1);
_stack.Push(s2);
break;
// Discard
case " \n\n":
_stack.Pop();
break;
// Discard n, keep top
case " \t\n":
var dt = _stack.Pop();
for (var i = 0; i != param; i++)
{
_stack.Pop();
}
_stack.Push(dt);
break;
// -- Arithmetic --
// +
case "\t ":
_stack.Push(_stack.Pop() + _stack.Pop());
break;
// -
case "\t \t":
_stack.Push(_stack.Pop() - _stack.Pop());
break;
// *
case "\t \n":
_stack.Push(_stack.Pop() * _stack.Pop());
break;
// /
case "\t \t ":
_stack.Push(_stack.Pop() / _stack.Pop());
break;
// %
case "\t \t\t":
_stack.Push(_stack.Pop() % _stack.Pop());
break;
// -- Heap Access --
// Store
case "\t\t ":
var hsVal = _stack.Pop();
var hsAdr = _stack.Pop();
_heap[hsAdr] = hsVal;
break;
// Retrieve
case "\t\t\t":
_stack.Push(_heap[_stack.Pop()]);
break;
// -- Flow Control --
// Mark
case "\n ":
_labels[param] = location;
break;
// Call
case "\n \t":
_callstack.Push(location);
return new Result(ResultType.Jump, _labels[param]);
// Jump
case "\n \n":
return new Result(ResultType.Jump, _labels[param]);
// Jump if zero
case "\n\t ":
if (_stack.Pop() == 0)
{
return new Result(ResultType.Jump, _labels[param]);
}
break;
// Jump if negative
case "\n\t\t":
if (_stack.Pop() < 0)
{
return new Result(ResultType.Jump, _labels[param]);
}
break;
// Exit func
case "\n\t\n":
return new Result(ResultType.Jump, _callstack.Pop());
// Exit app
case "\n\n\n":
return new Result(ResultType.End);
// -- I/O --
// Print character
case "\t\n ":
PrintChar((char) _stack.Pop());
break;
// Print number
case "\t\n \t":
PrintChar(_stack.Pop());
break;
// Read character
case "\t\n\t ":
_heap[_stack.Pop()] = ReadChar();
break;
// Read number
case "\t\n\t\t":
_heap[_stack.Pop()] = int.Parse(ReadString());
break;
}
return null;
}
private class Result
{
public ResultType Type { get; private set; }
public int Value { get; private set; }
public Result(ResultType type)
{
Type = type;
}
public Result(ResultType type, int value)
{
Type = type;
Value = value;
}
}
private enum ResultType
{
Jump,
End
}
}
}