started transitioning RollExpression parsing into a tokenized oo approach

Lexer.cs

@@ -0,0 +1,87 @@
+using System.Text.RegularExpressions;
+
+namespace Dungeoneer.Lexing {
+
+	public abstract class Token {
+
+		public virtual string Format() { return Expression(); }
+		public abstract string Expression();
+
+	}
+
+	public class LiteralToken : Token {
+		public string Content { get; private set; }
+
+		public LiteralToken(string text) { Content = text; }
+
+		public override string Expression() { return Content; }
+
+	}
+
+	public class DiceToken : Token {
+		public int Count { get; private set; }
+		public int Sides { get; private set; }
+		private List<int> _result = null;
+		public List<int> Result {
+			get {
+				if(_result == null) {
+					_result = new List<int>();
+					for(int i = 0; i < Count; i++)
+						_result.Add(Util.Roll(Sides));
+				}
+				return _result;
+			}
+		}
+		public int? _sum = null;
+		public int Sum {
+			get {
+				if(!_sum.HasValue) {
+					_sum = 0;
+					foreach(var roll in Result)
+						_sum += roll;
+				}
+				return _sum.Value;
+			}
+		}
+
+		public DiceToken(int count, int sides) {
+			Count = count;
+			Sides = sides;
+		}
+		public DiceToken(Match match) {
+			Count = int.Parse(match.Groups[1].Value);
+			Sides = int.Parse(match.Groups[2].Value);
+		}
+
+		private const string Style = "\x1b[34;1m";
+		private static readonly Regex Pattern = new Regex(@"(\d+)d(\d+)");
+
+		public override string Format() {
+			var output = $"{Style}( ";
+			var result = Result;
+			for(int i = 0; i < Count; i++)
+				if(i < Count - 1)
+					output += $"{result[i]}, ";
+				else
+					output += $"{result[i]} ){Dungeoneer.Format.Reset}";
+			return output;
+		}
+		public override string Expression() { return Sum.ToString(); }
+
+		public static Match Match(string text) { return Pattern.Match(text); }
+
+	}
+
+	/*public class DcToken : Token {
+
+		private const string Style = "\x1b[31m";
+		private static readonly Regex Pattern = new Regex(@"dc\:(\d+)");
+
+		public static Match Match(string text) { return Pattern.Match(text); }
+
+		public override string Expression() { return ""; }
+
+	}*/
+
+}
+

Roll.cs

@@ -0,0 +1,44 @@
+using System.Security.Cryptography;
+using System.Text.RegularExpressions;
+
+using Dungeoneer.Lexing;
+
+namespace Dungeoneer {
+
+	public class RollExpression {
+		private IList<string> Parts;
+		public string Print { get; private set; }
+		public string Expression { get; private set; }
+		public dynamic Result {
+			get {
+				try { return Scripting.Expr($"eval('{Expression}')"); }
+				catch { return null; }
+			}
+		}
+
+		public RollExpression(IList<string> parts) {
+			this.Parts = parts;
+			this.Print = "";
+			this.Expression = "";
+
+			//	build expression from string parts
+			foreach(string piece in Parts) {
+				//	die expression substitution
+				var dieCheck = DiceToken.Match(piece);
+				if(dieCheck.Success) {
+					var token = new DiceToken(dieCheck);
+
+					this.Print += $"{token.Format()} ";
+					this.Expression += $"{token.Expression()} ";
+				} else {
+					var part = $"{piece} ";
+					this.Expression += part;
+					this.Print += part;
+				}
+			}
+		}
+
+	}
+
+}
+

Util.cs

@@ -1,5 +1,4 @@
 using System.Security.Cryptography;
-using System.Text.RegularExpressions;
 
 namespace Dungeoneer {
 
@@ -11,57 +10,6 @@ namespace Dungeoneer {
 
 	}
 
-	public class RollExpression {
-		private IList<string> Parts;
-		public string Print { get; private set; }
-		public string Expression { get; private set; }
-		public dynamic Result {
-			get {
-				try { return Scripting.Expr($"eval('{Expression}')"); }
-				catch { return null; }
-			}
-		}
-
-		private const string DieFormat = "\x1b[34;1m";
-		private static readonly Regex DiePattern = new Regex(@"(\d+)d(\d+)");
-
-		public RollExpression(IList<string> parts) {
-			this.Parts = parts;
-			this.Print = "";
-			this.Expression = "";
-
-			//	build expression from string parts
-			foreach(string piece in Parts) {
-				//	die expression substitution
-				var dieCheck = DiePattern.Match(piece);
-				if(dieCheck.Success) {
-					//	get /(d+)/ capture group values
-					var count = int.Parse(dieCheck.Groups[1].Value);
-					var sides = int.Parse(dieCheck.Groups[2].Value);
-
-					//	and build roll outcomes
-					this.Print += $"{DieFormat}( ";
-					this.Expression += "( ";
-					for(int i = 0; i < count; i++) {
-						var roll = Util.Roll(sides);
-						if(i < count - 1) {
-							this.Print += $"{roll}, ";
-							this.Expression += $"{roll} + ";
-						} else {
-							var part = $"{roll} ";
-							this.Print += $"{roll} ){Format.Reset} ";
-							this.Expression += $"{roll} ) ";
-						}
-					}
-				} else {
-					var part = $"{piece} ";
-					this.Expression += part;
-					this.Print += part;
-				}
-			}
-		}
-
-	}
-
 }
 
+