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;;; chess-uci.el --- Universal chess interface protocol for emacs-chess
;; Copyright (C) 2014 Free Software Foundation, Inc.
;; Author: Mario Lang <mlang@delysid.org>
;; Keywords: games
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; URL: http://en.wikipedia.org/wiki/Universal_Chess_Interface
;;; Code:
(require 'chess-common)
(defvar chess-uci-long-algebraic-regexp "\\([a-h][1-8]\\)\\([a-h][1-8]\\)\\([nbrq]\\)?"
"A regular expression matching a UCI log algebraic move.")
(defun chess-uci-long-algebraic-to-ply (position move)
"Convert the long algebraic notation MOVE for POSITION to a ply."
(assert (vectorp position))
(assert (stringp move))
(let ((case-fold-search nil))
(when (string-match chess-uci-long-algebraic-regexp move)
(let ((color (chess-pos-side-to-move position))
(from (chess-coord-to-index (match-string 1 move)))
(to (chess-coord-to-index (match-string 2 move)))
(promotion (match-string 3 move)))
(apply #'chess-ply-create position nil
(if (and (= from (chess-pos-king-index position color))
(= (chess-index-rank from) (chess-index-rank to))
(> (abs (- (chess-index-file from)
(chess-index-file to))) 1))
(chess-ply-castling-changes
position
(< (- (chess-index-file to) (chess-index-file from)) 0))
(nconc (list from to)
(when promotion
(list :promote (upcase (aref promotion 0)))))))))))
(defsubst chess-uci-convert-long-algebraic (move)
"Convert long algebraic MOVE to a ply in reference to the engine position.
If conversion fails, this function fired an 'illegal event."
(or (chess-uci-long-algebraic-to-ply (chess-engine-position nil) move)
(chess-engine-command nil 'illegal)))
(defvar chess-uci-regexp-alist
(list
(cons "^id\\s-+name\\s-+\\(.+\\)$"
(function
(lambda ()
(setq-local chess-engine-opponent-name (match-string 1))
'once)))
(cons (concat "^bestmove\\s-+\\(" chess-uci-long-algebraic-regexp "\\)")
(function
(lambda ()
(funcall chess-engine-response-handler 'move
(chess-uci-convert-long-algebraic (match-string 1)))))))
"Patterns matching responses of a standard UCI chess engine.")
(defun chess-uci-position (game)
"Convert the current GAME position to a UCI position command string."
(concat "position fen " (chess-pos-to-fen (chess-game-pos game 0) t)
" moves " (mapconcat (lambda (ply)
(let ((source (chess-ply-source ply))
(target (chess-ply-target ply)))
(if (and source target)
(concat (chess-index-to-coord source)
(chess-index-to-coord target)
(if (chess-ply-keyword ply :promote)
(string (downcase (chess-ply-keyword ply :promote)))
""))
"")))
(chess-game-plies game) " ")
"\n"))
(defun chess-uci-handler (game event &rest args)
"Default handler for UCI based engines."
(unless chess-engine-handling-event
(cond
((eq event 'move)
(when (= 1 (chess-game-index game))
(chess-game-set-tag game "White" chess-full-name)
(chess-game-set-tag game "Black" chess-engine-opponent-name))
(chess-engine-send nil (concat (chess-uci-position game) "go\n"))
(if (chess-game-over-p game)
(chess-game-set-data game 'active nil)))
(t
(apply 'chess-common-handler game event args)))))
(provide 'chess-uci)
;;; chess-uci.el ends here
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