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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Obtain movements and other information from a subprocess
;;
;; $Revision$
;;; Commentary:
(require 'chess-game)
(require 'chess-algebraic)
(defgroup chess-process nil
"Code for reading movements and other commands from a subprocess."
:group 'chess)
(defvar chess-process-command-or-host nil
"What type of process is it?
This could be a string, naming a command to run, in which case it is a
local connection.
It could be a cons cell, giving the (HOST . PORT) of a network connection.
It could be a Lisp function, which will be called to establish
whatever type of connection it wishes, so long as it returns a buffer
related to the resulting process.")
(defvar chess-process-arguments nil
"If `chess-process-where' is a string or Lisp function, pass these args.")
(defvar chess-process-triggers
(list (list
(concat "\\s-*\\(white\\|black\\)\\s-*([0-9]+):\\s-+\\("
chess-algebraic-regexp "\\)\\s-*$")
(function
(lambda (color move)
(if (if (chess-game-side-to-move chess-process-game)
(string= (downcase color) "white")
(string= (downcase color) "black"))
(chess-game-move chess-process-game move nil)))) 1 2)
'(".*Illegal move:\\s-*\\(.*\\)"
(signal 'chess-illegal (match-string 1)))
'(".+?\015" (replace-match "")))
"A list of regexps and the commands that they trigger.
The alist should be of the form:
((REGEXP COMMAND ARG1-GROUP ARG2-GROUP ...) ...)
Where the ARG*-GROUP entries specify which parenthesis groups in the
regexp demarcate those arguments. Anything more complicated than this
must be handled by modules that derive from this module.")
(make-variable-buffer-local 'chess-process-command-or-host)
(make-variable-buffer-local 'chess-process-arguments)
(make-variable-buffer-local 'chess-process-triggers)
(defun chess-process (game handler triggers command-or-host &rest args)
"This function should only be called by specific chess engine modules."
(let ((buf (generate-new-buffer " *chess-process*")))
(with-current-buffer buf
(setq chess-process-command-or-host command-or-host)
(if args (setq chess-process-arguments command-or-host))
(if triggers (setq chess-process-triggers triggers)))
`(lambda (game command &rest args)
(apply ,(or (list 'quote handler)
'chess-process-handler) game ,buf command args))))
;;; Code:
(defvar chess-process-game)
(defvar chess-process-last-pos)
(defvar chess-process-working nil)
(make-variable-buffer-local 'chess-process-game)
(make-variable-buffer-local 'chess-process-last-pos)
(make-variable-buffer-local 'chess-process-working)
(defun chess-process-handler (game buffer command &rest args)
"Handle any commands being sent to this instance of this module."
(ignore
(if (eq command 'shutdown)
(when (buffer-live-p buffer)
(condition-case err
(process-send-string (get-buffer-process buffer) "quit\n")
(error nil))
(kill-buffer buffer))
(with-current-buffer buffer
(let (cmdstr)
(cond
((eq command 'initialize)
(setq chess-process-game game
chess-process-last-pos (point-min))
(let ((proc
(if (stringp chess-process-command-or-host)
(prog2
(message "Starting chess program '%s'..."
chess-process-command-or-host)
(apply 'start-process "chess-process"
(current-buffer)
chess-process-command-or-host
chess-process-arguments)
(message "Starting chess program '%s'...done"
chess-process-command-or-host))
(prog2
(message "Connecting to host %s:%d..."
(car chess-process-command-or-host)
(cdr chess-process-command-or-host))
(open-network-stream
"chess-process" (current-buffer)
(car chess-process-command-or-host)
(cdr chess-process-command-or-host))
(message "Connecting to host %s:%d...done"
(car chess-process-command-or-host)
(cdr chess-process-command-or-host))))))
(unless (and proc (memq (process-status proc) '(run open)))
(error "Failed to start chess process"))
(set-process-filter proc 'chess-process-filter)))
((eq command 'pass)
(setq cmdstr "go\n"))
((eq command 'move)
(setq cmdstr (concat (chess-board-last-move
(chess-game-board game)) "\n"))))
(if (and cmdstr (not chess-process-working))
(process-send-string (get-buffer-process (current-buffer))
cmdstr)))))))
(defun chess-process-filter (proc string)
"Process filter for receiving text from a chess process."
(let ((buf (process-buffer proc)))
(when (buffer-live-p buf)
(with-current-buffer buf
(let ((moving (= (point) (process-mark proc))))
(save-excursion
;; Insert the text, advancing the process marker.
(goto-char (process-mark proc))
(insert string)
(set-marker (process-mark proc) (point)))
(if moving (goto-char (process-mark proc))))
(unless chess-process-working
(setq chess-process-working t)
(unwind-protect
(progn
(goto-char chess-process-last-pos)
(beginning-of-line)
(while (not (eobp))
(condition-case err
(let ((triggers chess-process-triggers))
(while triggers
;; this could be accelerated by joining
;; together the regexps
(when (looking-at (caar triggers))
(let ((command (nth 1 (car triggers)))
(args (mapcar 'match-string
(nthcdr 2 (car triggers)))))
(cond
((functionp command)
(apply command args))
((symbolp command)
(chess-game-send-event chess-process-game
command args))
(t (eval command)))))
(setq triggers (cdr triggers))))
(chess-illegal (error-message-string err)))
(forward-line)))
(setq chess-process-last-pos (point)
chess-process-working nil)))))))
(provide 'chess-process)
;;; chess-process.el ends here
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