/usr/share/emacs/site-lisp/chess/chess-epd.el is in emacs-chess 2.0b6-1.1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | ;;; chess-epd.el --- Extended Position Description Format
;; 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.
;;; Commentary:
;; EPD is the "Extended Position Description" format. It is a standard for
;; describing chess positions along with an extended set of structured
;; attribute values using the ASCII character set. It is intended for data and
;; command interchange among chessplaying programs. It is also intended
;; for the representation of portable opening library repositories and for
;; problem test suites.
;; A single EPD record uses one text line of variable length composed of
;; four data fields followed by zero or more operations. A text file
;; composed exclusively of EPD data records should have a file name with
;; the suffix ".epd".
;;; Code:
(require 'chess-fen)
(require 'chess-ply)
(require 'chess-pos)
(require 'chess-var)
(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))
((or (eq opcode 'pv) (eq opcode 'sv))
(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 a string representation in extended
position description format."
(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,
and advance point after the correctly parsed position."
(if (stringp string)
(with-temp-buffer
(insert string)
(chess-epd-parse))
(chess-epd-parse)))
(defun chess-epd-read-file (file)
"Return a list of positions contained in FILE."
(let ((positions (list t)) pos)
(with-temp-buffer
(insert-file-literally file)
(goto-char (point-min))
(while (setq pos (chess-epd-parse))
(nconc positions (list pos))))
(cdr positions)))
(defsubst chess-game-to-epd (game &optional to-string index)
(if to-string
(chess-pos-to-epd (chess-game-pos game index))
(insert (chess-pos-to-epd (chess-game-pos game index)) ?\n)))
(defsubst chess-epd-to-game (&optional string)
(chess-game-create (chess-epd-to-pos string)))
(defun chess-epd-parse ()
(when (re-search-forward chess-fen-regexp 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))
((or (eq opcode 'pm) (eq opcode 'sm)) ;predicted/supplied move
(chess-ply-from-string pos val))
((or (eq opcode 'pv) (eq opcode 'sv)) ; predicted/supplied variation
(let ((var (chess-var-create pos)))
(mapc (lambda (ply)
(let ((changes (chess-ply-from-string
(chess-var-pos var) ply)))
(if changes
(chess-var-move var changes)
(error "Unable to convert ply '%s'" 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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