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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using DotnetPgn.Models;
namespace DotnetPgn
{
public static class Tokenizer
{
private static readonly Regex s_halfMoveRegex =
new(@"([KQRBNP]?)([a-h]?[1-8]?)(x?)([a-h][1-8])([+#]?)");
public static IEnumerable<HalfMove> ParseMoves(string moveText)
{
StringBuilder currToken = new();
char[] moveTextChars = moveText.ToCharArray();
int moveNumber = 1;
Player currPlayer = Player.White;
for (int i = 0; i < moveTextChars.Length; i++)
{
char nextChar = moveTextChars[i];
if (nextChar is ' ' or '\t' or '\n' or '\r')
{
// We should have either a move number or a complete halfmove.
string token = currToken.ToString();
currToken.Clear();
Match match = s_halfMoveRegex.Match(token);
if (!match.Success)
{
Console.WriteLine($"Unrecognized token: `{token}`");
Console.WriteLine();
continue;
}
Console.WriteLine($"Recognized token: {token}");
Console.WriteLine($"Matching groups: ({match.Groups[1].Value})" +
$"({match.Groups[2].Value})({match.Groups[3].Value})({match.Groups[4].Value})" +
$"({match.Groups[5].Value})");
var move = new HalfMove
{
MoveNumber = moveNumber,
Player = currPlayer,
Piece = PieceParser.ParsePiece(match.Groups[1].Value),
TargetSquare = new Square(match.Groups[4].Value[0], Convert.ToInt32(Char.GetNumericValue(match.Groups[4].Value[1]))),
};
Console.WriteLine($"Halfmove: {move.MoveNumber}. {move.Player} {move.Piece} from {move.SourceSquare} to {move.TargetSquare}");
Console.WriteLine();
if (currPlayer == Player.White)
{
currPlayer = Player.Black;
}
else
{
currPlayer = Player.White;
moveNumber++;
}
yield return move;
}
else
{
currToken.Append(nextChar);
}
}
}
}
}
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