tuenti3.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tuenti3
{
    class Program
    {   
        class Instruction
        {
            public string Name { get; set; }
            public string Param { get; set; }
        }

        class Command
        {
            public string Name { get; set; }
            public List<Instruction> Instructions { get; set; }
        }

        class State
        {
            public string Name { get; set; }
            public List<Command> Commands { get; set; }
        }

        class Script
        {
            public List<State> CodeSegment { get; set; }
            public List<string> TapeSegment { get; set; }
            public string Execute(string input)
            {
                var sbInput = new StringBuilder(input);
                var curState = CodeSegment[0];
                var curCmdName = "";
                var isEnd = false;
                var pointer = 0;
                while (!isEnd)
                {   
                    if (pointer < 0 || pointer >= sbInput.Length) 
                    {
                        if (pointer < 0)
                        {
                            pointer = 0;
                            sbInput.Insert(0, " ");
                        }
                        else
                        {
                            sbInput.Append(" ");
                            pointer = sbInput.Length - 1;
                        }
                    }
                    
                    curCmdName = "'" + sbInput[pointer] + "'";

                    var curCmd = curState.Commands.FirstOrDefault(cmd => cmd.Name == curCmdName);
                    for (int j = 0; j < curCmd.Instructions.Count; j++)
                    {
                        var inst = curCmd.Instructions[j];
                        if (inst.Name == "move")
                        {
                            if (inst.Param == "right")
                                pointer++;
                            else
                                pointer--;
                        } 
                        else if (inst.Name == "state")
                        {
                            if (inst.Param == "end") 
                                isEnd = true;
                            else
                                curState = CodeSegment.FirstOrDefault(s => s.Name == inst.Param);
                        }
                        else
                        {
                            var val = inst.Param.Replace("'", "");
                            if (pointer < sbInput.Length)
                                sbInput.Replace(sbInput[pointer].ToString(), val, pointer, 1);
                            else
                                sbInput.Append(val);
                        }
                    }
                    
                }

                return sbInput.ToString();
            }
        }

        static void Main(string[] args)
        {
            var script = LoadScript("submitInput.txt");
            var result = "";
            var i = 0;
            foreach (var input in script.TapeSegment)
            {
                i++;
                result += "Tape #" + i.ToString() + ": "+ script.Execute(input) + "\n";
            }

            File.WriteAllText("submitOutput.txt", result);
        }

        static Script LoadScript(string path)
        {
            Script script = null;
            var lines = File.ReadAllLines(path);
            var lineIdx = 0;

            State curState = null;
            Command curCmd = null;
            var inTapeSection = false;
            var isEnd = false;

            while (!isEnd)
            {
                var line = lines[lineIdx];
                if (line == "---")
                    script = new Script();
                else if (line == "...")
                    isEnd = true;
                else if (line == "code:")
                {
                    script.CodeSegment = new List<State>();
                }
                else if (line == "tapes:")
                {
                    script.TapeSegment = new List<string>();
                    inTapeSection = true;
                }
                else
                {
                    var prefix = line.Substring(0, 6);
                    if (prefix == "      ")
                    {
                        var instruction = new Instruction();
                        instruction.Name = line.Trim().Split(':')[0].Trim();
                        instruction.Param = line.Trim().Split(':')[1].Trim();

                        curCmd.Instructions.Add(instruction);
                    }
                    else
                    {
                        prefix = line.Substring(0, 4);
                        if (prefix == "    ")
                        {
                            curCmd = new Command();
                            curCmd.Name = line.Trim().Replace(":","");
                            curCmd.Instructions = new List<Instruction>();
                            curState.Commands.Add(curCmd);
                        }
                        else
                        {
                            prefix = line.Substring(0, 2);
                            if (prefix == "  ")
                            {
                                if (inTapeSection)
                                {
                                    var input = line.Split(':')[1].Trim().Replace("'", "");
                                    script.TapeSegment.Add(input);
                                }
                                else
                                {
                                    curState = new State();
                                    curState.Name = line.Trim().Replace(":", "");
                                    curState.Commands = new List<Command>();
                                    script.CodeSegment.Add(curState);
                                }
                            }
                        }
                    }
                }
                
                lineIdx++;
            }

            return script;
        }
    }
}