checkpoint

Shogi.Domain/Notation.cs

@@ -0,0 +1,33 @@
+using System.Text.RegularExpressions;
+
+namespace Shogi.Domain
+{
+	public static class Notation
+	{
+		private static readonly string BoardNotationRegex = @"(?<file>[A-I])(?<rank>[1-9])";
+		private static readonly char A = 'A';
+
+		public static string ToBoardNotation(Vector2 vector)
+		{
+			return ToBoardNotation((int)vector.X, (int)vector.Y);
+		}
+
+		public static string ToBoardNotation(int x, int y)
+		{
+			var file = (char)(x + A);
+			var rank = y + 1;
+			return $"{file}{rank}";
+		}
+		public static Vector2 FromBoardNotation(string notation)
+		{
+			if (Regex.IsMatch(notation, BoardNotationRegex))
+			{
+				var match = Regex.Match(notation, BoardNotationRegex, RegexOptions.IgnoreCase);
+				char file = match.Groups["file"].Value[0];
+				int rank = int.Parse(match.Groups["rank"].Value);
+				return new Vector2(file - A, rank - 1);
+			}
+			throw new ArgumentException($"Board notation not recognized. Notation given: {notation}");
+		}
+	}
+}