Day 8 Advent of Code 2020

aoc2020-08.cs

using System.Collections.Generic;
using System.Linq;
using AdventOfCode.Library;
using AdventOfCode.Library.Interpreter;

namespace AdventOfCode
{
    // Day 8
    internal static class Program
    {
	    private const bool DoPart1 = true;
	    private const bool DoPart2 = true;

	    public static void Main()
	    {
		    var data = TextUtility.ReadLines(removeBlank: true);
		    data.Process(DoPart1, 1, Solver1);
		    data.Process(DoPart2, 2, Solver2);
	    }

	    private static string Solver1(List<string> arg1)
	    {
		    var instructions = arg1.Select(k => new Instruction(k)).ToList();
		    var game = new Machine(instructions);
		    game.Run();
		    return $"{game.Accumulator}";
	    }

	    private static string Solver2(List<string> arg1)
	    {
		    var source = arg1.Select(k => new Instruction(k)).ToList();
		    var accumulator = 0;
		    
		    for (var i = 0; i < source.Count; i++)
		    {
			    var edited = arg1.Select(k => new Instruction(k)).ToList();
			    edited[i] = SwapInstruction(source[i]);
			    
			    var game = new Machine(edited);
			    game.Run();

			    if (!game.Error || game.ProgramIndex != game.OpCount)
			    {
				    continue;
			    }
			    accumulator = game.Accumulator;
			    break;
		    }

		    return $"{accumulator}";
	    }

	    private static Instruction SwapInstruction(Instruction i)
	    {
		    return i.Operation switch
		    {
			    OpCode.Jmp => new Instruction(OpCode.Nop, i.Value),
			    OpCode.Nop => new Instruction(OpCode.Jmp, i.Value),
			    _ => i
		    };
	    }
    }
}

Just the basics for now. My VM is kind of a cluster of files right now, and I'll place it somewhere once it's in a presentable state.