Got many functions initially working.

Code can be parsed via pipes or typed lines

Assignment 1/Program.cs

@@ -31,10 +31,10 @@ namespace Assignment_1
             };
         static void Main(string[] args)
         {
-            Console.WriteLine("┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓");
+            Console.WriteLine("┌──────────────────────────────────────────┐");
-            Console.WriteLine("┃  159.341 2021 Semester 1, Assignment 1   ┃");
+            Console.WriteLine("│  159.341 2021 Semester 1, Assignment 1   │");
-            Console.WriteLine("┃  Submitted by Brychan Dempsey, 14299890  ┃");
+            Console.WriteLine("│  Submitted by Brychan Dempsey, 14299890  │");
-            Console.WriteLine("┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛");
+            Console.WriteLine("└──────────────────────────────────────────┘");
             MemoryStream sourceStream = new MemoryStream(1024); // Creates a memory stream to retain source while being interpreted.
 
             
@@ -55,6 +55,8 @@ namespace Assignment_1
                 dynamicInput = true;
             }
             parser.StartParsing(sourceStream, dynamicInput);
+
+            Console.ReadLine();
         }
         public class Parser
         {
@@ -72,8 +74,64 @@ namespace Assignment_1
             }
             public void StartParsing(Stream source, bool dynamicInput = false)
             {
+                if ((byte)source.ReadByte() == '{')
+                {
+                    while (true)
+                    {
+                        if (dynamicInput)
+                        {
+                            Console.WriteLine("Enter a command: ");
+                            string s = Console.ReadLine();
+                            long pos = source.Position;
+                            source.Write(Encoding.UTF8.GetBytes(s));
+                            source.Position = pos;
+                            int g = 0;
+                        }
+                        // parse the statement or list of statements;
+                        // This is done by reading the next word
+                        SkipWhitespace(source);
+                        string word = "";
+                        long position = FindNextWord(source, out word);
+                        object statementType;
+                        if (Enum.TryParse(typeof(statements), word, out statementType))
+                        {
+                            source.Position = position;
+                            switch ((statements)statementType)
+                            {
+                                case statements.exit:
+                                    Exit();
+                                    break;
+                                case statements.append:
+                                    Append(source);
+                                    break;
+                                case statements.list:
+                                    List();
+                                    break;
+                                case statements.print:
+                                    Print(source, 0);
+                                    break;
+                                case statements.printlength:
+                                    Print(source, 1);
+                                    break;
+                                case statements.printwordcount:
+                                    Print(source, 2);
+                                    break;
+                                case statements.printwords:
+                                    Print(source, 3);
+                                    break;
+                                case statements.set:
+                                    Set(source);
+                                    break;
+                                case statements.reverse:
+                                    Reverse(source);
+                                    break;
+                            }
+                        }
+                        else Console.WriteLine("Failed parsing statement");
+                    }
                     
                 }
+            }
 
             #region Function Handling
             bool Append(Stream source)
@@ -118,13 +176,13 @@ namespace Assignment_1
 
             void List()
             {
-                Console.WriteLine("┌" + new string('─', 49) + "┐");
+                Console.WriteLine("┌" + new string('─', 15) + "┬" + new string('─', 25) + "┬" + new string('─', 9) + "┐");
-                Console.WriteLine("│{0:-15}│{1:-25}│{2:9}│", "Symbol", "Value", "Flags");
+                Console.WriteLine("│{0,-15}│{1,-25}│{2,9}│", "Symbol", "Value", "Flags");
                 Console.WriteLine("├" + new string('─', 15) + "┼" + new string('─', 25) + "┼" + new string('─', 9) + "┤");
-                int keyPos = Symbols.Count;
+                int keyPos = 0;
                 foreach (var item in Symbols)
                 {
-                    Console.WriteLine("│{0:-15}│{1:-25}│{2:9}│", item.Key, item.Value.Item1, Convert.ToString((byte)item.Value.Item2,2).PadLeft(8,'0'));
+                    Console.WriteLine("│{0,-15}│{1,-25}│{2,9}│", item.Key, item.Value.Item1.Replace("\r","\\r").Replace("\n","\\n").Replace("\t", "\\t"), Convert.ToString((byte)item.Value.Item2,2).PadLeft(8,'0'));
                     if (keyPos == Symbols.Count-1)
                     {
                         Console.WriteLine("└" + new string('─', 15) + "┴" + new string('─', 25) + "┴" + new string('─', 9) + "┘");
@@ -133,6 +191,7 @@ namespace Assignment_1
                     {
                         Console.WriteLine("├" + new string('─', 15) + "┼" + new string('─', 25) + "┼" + new string('─', 9) + "┤");
                     }
+                    keyPos++;
                 }
             }
             void Exit()
@@ -176,7 +235,7 @@ namespace Assignment_1
                     }
                     
                 }
-                
+                source.Position = result;
                 return true;
             }
 
@@ -200,9 +259,10 @@ namespace Assignment_1
                 }
                 if (Symbols.ContainsKey(identifier))
                 {
-                    if (Symbols[identifier].Item2 == VariableFlags.Reserved)
+                    if (Symbols[identifier].Item2.HasFlag(VariableFlags.Reserved))
                     {
-                        Console.WriteLine("Error: Cannot assign to {0} as it is a reserved constant.");
+                        Console.WriteLine("Error: Cannot assign to {0} as it is a reserved constant.", identifier);
+                        source.SetLength(source.Position); // Wipe the remainder of the stream, so that it doesn't get read
                         return false;
                     }
                     Symbols[identifier] = new Tuple<string, VariableFlags>(expression, Symbols[identifier].Item2);
@@ -211,6 +271,7 @@ namespace Assignment_1
                 {
                     Symbols.Add(identifier, new Tuple<string, VariableFlags>(expression, VariableFlags.Empty));
                 }
+                source.Position = resultPos;
                 return true;
             }
 
@@ -289,8 +350,9 @@ namespace Assignment_1
                 }
                 else
                 {
+                    s.Position--;
                     string keyValue;
-                    long t = FindIdentifier(s, out keyValue);
+                    long t = FindExistingIdentifier(s, out keyValue);
                     returnedValue = Symbols[keyValue].Item1;
                     return t;
                     
@@ -298,21 +360,16 @@ namespace Assignment_1
             }
 
             long FindIdentifier(Stream s, out string returnedKey)
+            {
+                long wordEnd = FindNextWord(s, out returnedKey);
+                return wordEnd;
+            }
+            long FindExistingIdentifier(Stream s, out string returnedKey)
             {
                 string identifier;
                 long wordEnd = FindNextWord(s, out identifier);
                 // Lookup the value in the symbol table
-                try
+                returnedKey = identifier;
-                {
-                    returnedKey = Symbols[identifier].Item1;
-                }
-                catch (KeyNotFoundException e)
-                {
-                    Console.WriteLine("Could not find a defined variable with the name {0}", identifier);
-                    Console.Error.WriteLine(e);
-                    returnedKey = "";
-                    return -1;
-                }
                 return wordEnd;
             }
 
@@ -418,7 +475,11 @@ namespace Assignment_1
             while (!charFound)
             {
                 char nextChar = GetChar(s);
-                if (p(nextChar, s))
+                if (nextChar == 0)
+                {
+                    charFound = true;
+                }
+                else if (p(nextChar, s))
                 {
                    /*if (c == '\n')
                     {
@@ -437,7 +498,7 @@ namespace Assignment_1
             result = sb.ToString();
             long newPosition = s.Position;
             s.Position = start;
-            return newPosition;
+            return newPosition--;
         }
 
         /// <summary>
@@ -459,6 +520,10 @@ namespace Assignment_1
             // Fortunately, the standard ASCII table is 7-bits long. The 8th bit is used to determine the character size
             int readAmount = 0;
             int firstChar = s.ReadByte();
+            if (firstChar == -1)
+            {
+                return (char)0;
+            }
             if ((firstChar >> 3) == 0x1E) // 11110xxx implies a 4-byte length character
             {
                 readAmount = 3;
@@ -480,6 +545,7 @@ namespace Assignment_1
                 if (nextChar >> 6 != 2) throw new Exception("Character is not a valid UTF-8 code point!");
                 charBytes[i] = (byte)nextChar;
             }
+            s.Position += readAmount;
             string converted = Encoding.UTF8.GetString(charBytes);
             return converted[0];
         }
@@ -491,6 +557,7 @@ namespace Assignment_1
             {
                 readByte = s.ReadByte();
             }
+            s.Position--;
         }
     }
 }