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;;; chess-epd.el --- Extended Position Description module
;; Copyright (C) 2004 Free Software Foundation, Inc.
;; Author: Mario Lang <mlang@delysid.org>
;; 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.
;;; Code:
(require 'chess-fen)
(require 'chess-ply)
(require 'chess-pos)
(defun chess-epd-annotation-to-string (annotation)
(let ((opcode (car annotation))
(value (cdr annotation)))
(cond
((or (eq opcode 'am) (eq opcode 'bm))
(assert (consp value))
(format "%S %s;"
opcode (mapconcat #'chess-ply-to-string value " ")))
((eq opcode 'ce)
(assert (integerp value))
(format "%S %d;" opcode value))
((eq opcode 'pv)
(format "%S %s;"
opcode (chess-var-to-algebraic value)))
(t
(format "%S%s;" opcode (if (eq value t) "" (format " %s" value)))))))
(defun chess-pos-to-epd (position)
"Convert a chess POSITION to EPD."
(assert position)
(concat (chess-pos-to-fen position)
(when (consp (chess-pos-annotations position))
(concat " "
(mapconcat #'chess-epd-annotation-to-string
(chess-pos-annotations position)
" ")))))
(defun chess-epd-to-pos (&optional string)
"Convert extended position description to a chess position.
If STRING is not specified, look for an EPD string in the current buffer."
(if (stringp string)
(with-temp-buffer
(insert string)
(chess-epd-parse))
(chess-epd-parse)))
(defun chess-epd-read-file (file)
"Reads in an EPD file and returns a list of positions."
(let (positions pos)
(with-temp-buffer
(insert-file-literally file)
(goto-char (point-min))
(while (setq pos (chess-epd-parse))
(setq positions (cons pos positions))))
positions))
(defun chess-epd-parse ()
(when (re-search-forward
"\\([bnrqkpBNRQKP1-8]*/?\\)+ [bw] \\(-\\|[KQkq]+\\) \\(-\\|[1-8]\\)"
nil t)
(let ((pos (chess-fen-to-pos (match-string 0))))
(while (= 1 (skip-chars-forward " "))
(if (looking-at "[A-Za-z]")
(let ((opcode (intern (buffer-substring
(point) (+ (point) (skip-chars-forward
"A-Za-z0-9_"))))))
(if (= 1 (skip-chars-forward ";"))
(chess-pos-set-epd pos opcode)
(if (= (skip-chars-forward " ") 1)
(let ((val (buffer-substring
(point) (prog1
(+ (point)
(skip-chars-forward "^;"))
(skip-chars-forward ";")))))
(chess-pos-set-epd
pos opcode
(cond
((or (eq opcode 'am) (eq opcode 'bm))
(mapcar (lambda (move)
(chess-ply-from-string pos move))
(split-string val " ")))
((eq opcode 'ce)
(read val))
((eq opcode 'pm)
(chess-ply-from-string pos val))
((eq opcode 'pv) ; predicted variation
(let ((var (chess-var-create pos)))
(mapc (lambda (ply)
(chess-var-move var
(chess-ply-from-string
(chess-var-pos var) ply)))
(split-string val " "))
var))
(t val))))
(error "Illegal char following identifier"))))
(error "Illegal Identifier")))
(skip-chars-forward "\n")
pos)))
(provide 'chess-epd)
;;; chess-epd.el ends here
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