completed parser and reimplemented repl loop to C#

scripts/repl.py

@@ -1,14 +0,0 @@
-
-def repl_loop():
-	while True:
-		raw = input("> ")
-		if raw == 'exit':
-			break
-		parts = raw.split(" ")
-		command = parts[0]
-		del parts[0]
-		if command in repl_commands:
-			repl_commands[command](parts)
-
-repl_loop()
-

src/Command.cs

@@ -1,34 +1,40 @@
 using System.Text.RegularExpressions;
 
+using Dungeoneer.Interpreter;
+
 namespace Dungeoneer {
 
 	public sealed class Command {
 
-		public static void Roll(IList<string> args) {
+		public static void Roll(TokenSet input) {
 			//	don't do anything with empty expressions
-			if(args.Count == 0)
+			if(input.Count == 0)
 				return;
 
 			//	pass to subcommands
-			var first = args[0];
+			var first = input[0];
-			if(Program.RollMacros.ContainsKey(first)) {
+			if(first is NameToken) {
-				Program.RollMacros[first](args);
+				string value = ((NameToken)first).Value;
+				var subset = new TokenSet(input);
+				subset.RemoveAt(0);
+				Program.RollMacros[value](subset);
 				return;
 			}
 
 			//	create new parsed expression object and pretty-print
-			var roll = new RollExpression(args);
+			var roll = Dungeoneer.Interpreter.Parser.ParseRoll(input);
-			var result = roll.Result;
+			//var result = roll.Result;
-			if(result == null)
+			Console.WriteLine($"{input}\n=> {roll}");
-				Console.WriteLine("invalid expression");
-			else
-				Console.WriteLine($"{roll.Print}\n => {result}");
 		}
 
-		public static void New(IList<string> args) {
+		public static void New(TokenSet input) {
 			
 		}
 
+		public static void LexTest(TokenSet input) {
+			Console.WriteLine(input);
+		}
+
 	}
 
 }

src/Lex.cs

@@ -6,8 +6,8 @@ namespace Dungeoneer.Interpreter {
 
 	public static class Lexer {
 
-		public static readonly char[] Delimiters = { ' ', '+', '-', '*', '/', '^' };
+		public static readonly char[] Delimiters = { ' ', '+', '-', '*', '/', '^', '%' };
-		public static readonly char[] Operators = { '+', '-', '*', '/', '^' };
+		public static readonly char[] Operators = { '+', '-', '*', '/', '^', '%' };
 
 		public static TokenSet Tokenize(string text) {
 			var output = new TokenSet();
@@ -23,7 +23,6 @@ namespace Dungeoneer.Interpreter {
 			foreach(char c in text) {
 				if(Delimiters.Contains(c)) {
 					if(buffer.Length != 0) {
-						Console.WriteLine(buffer);
 						var token = Match(buffer);
 						output.Add(token);
 					}
@@ -40,6 +39,16 @@ namespace Dungeoneer.Interpreter {
 			return output;
 		}
 
+		public static Token First(string text) {
+			string buffer = "";
+			foreach(char c in text)
+				if(Delimiters.Contains(c) && !Operators.Contains(c))
+					break;
+				else
+					buffer += c;
+			return Match(buffer);
+		}
+
 		public static Token Match(string text) {
 
 			var diceMatch = DiceToken.Match(text);
@@ -58,6 +67,10 @@ namespace Dungeoneer.Interpreter {
 			if(varMatch.Success)
 				return new VarToken(varMatch);
 
+			var nameMatch = NameToken.Match(text);
+			if(nameMatch.Success)
+				return new NameToken(nameMatch);
+
 			throw new UnmatchedTokenException(text);
 		}
 
@@ -66,6 +79,7 @@ namespace Dungeoneer.Interpreter {
 	public class TokenSet : List<Token> {
 
 		public TokenSet() : base() { }
+		public TokenSet(List<Token> set) : base(set) { }
 
 		public override string ToString() {
 			var output = "";
@@ -111,6 +125,17 @@ namespace Dungeoneer.Interpreter {
 
 	}
 
+	public class NameToken : Token {
+		public string Value { get; private set; }
+
+		internal static readonly Regex Pattern = new Regex(@"^[A-Za-z][A-Za-z\d\-_]+$");
+
+		public NameToken(Match match) { Value = match.Groups[0].Value; }
+
+		public static Match Match(string text) { return Pattern.Match(text); }
+
+	}
+
 	public class VarToken : ValueToken {
 
 		private const string Style = "\x1b[33;1m";

src/Parse.cs

@@ -0,0 +1,54 @@
+using System;
+
+namespace Dungeoneer.Interpreter {
+
+	public static class Parser {
+
+		public static int ParseRoll(string text) { return ParseRoll(Lexer.Tokenize(text)); }
+		public static int ParseRoll(TokenSet tokens) {
+			int result = 0;
+			bool wasValue = false;
+			char operation = '+';
+			int? rollDc = null;
+			foreach(Token token in tokens) {
+				switch(token) {
+					case ValueToken value:
+						if(wasValue)
+							throw new Exception("value -> value");
+						result = Operate(result, value.Value, operation);
+						wasValue = true;
+						break;
+					case OperatorToken op:
+						if(!wasValue)
+							throw new Exception("operator -> operator");
+						operation = op.Value;
+						wasValue = false;
+						break;
+					case DcToken dc:
+						if(rollDc.HasValue)
+							throw new Exception("two DC elements");
+						rollDc = dc.Value;
+						break;
+					default:
+						throw new Exception($"invalid token: {token.GetType()}");
+				}
+			}
+			return result;
+		}
+
+		public static int Operate(int a, int b, char op) {
+			switch(op) {
+				case '+':	return (a + b);
+				case '-':	return (a - b);
+				case '*':	return (a * b);
+				case '/':	return (a / b);
+				case '%':	return (a % b);
+				case '^':	return (int)Math.Pow(a, b);
+				default:	throw new Exception("unmatched operator");
+			}
+		}
+
+	}
+
+}
+

src/Program.cs

@@ -1,13 +1,16 @@
 using System;
 
+using Dungeoneer.Interpreter;
+
 namespace Dungeoneer {
 
 	public sealed class Program {
 
-		public delegate void Command(IList<string> args);
+		public delegate void Command(TokenSet input);
 		public static Dictionary<string, Command> ReplCommands = new Dictionary<string, Command> {
 			{ "new", (Command)Dungeoneer.Command.New },
-			{ "roll", (Command)Dungeoneer.Command.Roll }
+			{ "roll", (Command)Dungeoneer.Command.Roll },
+//			{ "lex", (Command)Dungeoneer.Command.LexTest }
 			//	TODO: "with"?
 		};
 
@@ -19,7 +22,25 @@ namespace Dungeoneer {
 		public static void Main() {
 			Console.WriteLine("Starting");
 
-			Scripting.Run("scripts/repl.py");
+			Repl();
+		}
+
+		public static void Repl() {
+			while(true) {
+				Console.Write("> ");
+				var raw = Console.ReadLine();
+				if(raw == "exit")
+					break;
+				var tokens = Lexer.Tokenize(raw);
+				var first = tokens[0];
+				tokens.RemoveAt(0);
+				if(first is NameToken) {
+					var command = (first as NameToken).Value;
+					ReplCommands[command](tokens);
+				} else {
+					Console.WriteLine($"no command '{raw}' found!");
+				}
+			}
 		}
 
 	}

src/Roll.cs

@@ -1,7 +1,7 @@
 using System.Security.Cryptography;
 using System.Text.RegularExpressions;
 
-using Dungeoneer.Lexing;
+using Dungeoneer.Interpreter;
 
 namespace Dungeoneer {
 
@@ -79,28 +79,15 @@ namespace Dungeoneer {
 
 	public static class RollMacro {
 
-		public static void Pool(IList<string> args) {
+		public static void Pool(TokenSet input) {
-			DiceToken? dice = null;
+			/*
-			int? dc = null;
-
-			for(int i = 1; i < args.Count; i++) {
-				string arg = args[i];
-				var dieCheck = DiceToken.Match(arg);
-				if(dieCheck.Success)
-					dice = new DiceToken(dieCheck);
-				else
-					dc = int.Parse(arg);
-			}
-
-			var rolls = dice.Result;
-			bool success = false;
 			foreach(var roll in rolls)
 				if(roll > dc.Value) {
 					success = true;
 					break;
 				}
 			var result = RollResult.Wrap(success);
-			Console.WriteLine($"{dice}\n => {result}");
+			Console.WriteLine($"{dice}\n => {result}");*/
 		}
 
 	}

src/Scripting.cs

@@ -1,9 +1,12 @@
 using System.Collections.Generic;
+using System.Dynamic;
 using System.Reflection;
 
 using IronPython.Hosting;
 using Microsoft.Scripting.Hosting;
 
+using Dungeoneer.Interpreter;
+
 namespace Dungeoneer {
 
 	public static class Scripting {
@@ -29,6 +32,11 @@ namespace Dungeoneer {
 			Scope.repl_commands = Program.ReplCommands;
 			Scope.roll_macros = Program.RollMacros;
 
+			Scope.interpret = new ExpandoObject();
+			Scope.interpret.tokenize = (Func<string, TokenSet>)Lexer.Tokenize;
+			Scope.interpret.first_token = (Func<string, Token>)Lexer.First;
+		//	Scope.interpret.parse_roll = (Func<string, string>)Interpreter.Parser.ParseRoll;
+
 			//	helper functions
 			Scope.roll = (Func<int, int>)Dungeoneer.Util.Roll;
 		}