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|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Obtain movements and other information from a subprocess
;;
;; $Revision$
;;; Commentary:
(require 'chess-session)
(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.")
(make-variable-buffer-local 'chess-process-command-or-host)
(defvar chess-process-arguments nil
"If `chess-process-where' is a string or Lisp function, pass these args.")
(defvar chess-process-game)
(defvar chess-process-last-pos)
(defvar chess-process-working nil)
(make-variable-buffer-local 'chess-process-arguments)
(make-variable-buffer-local 'chess-process-game)
(make-variable-buffer-local 'chess-process-last-pos)
(make-variable-buffer-local 'chess-process-working)
(defvar chess-process-triggers nil
"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-triggers)
;;; Code:
(defun chess-process (session buffer event &rest args)
"Handle any commands being sent to this instance of this module."
(cond
((eq event 'initialize)
(let ((buf (generate-new-buffer " *chess-process*")))
(with-current-buffer buf
(setq chess-process-triggers (nth 0 args)
chess-process-command-or-host (nth 1 args)
chess-process-arguments (nthcdr 2 args))
(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))
buf)))
((eq event 'shutdown)
(if (buffer-live-p buffer)
(kill-buffer buffer)))
(t
(ignore
(with-current-buffer buffer
(cond
((eq event 'setup)
(setq chess-process-game (car args)
chess-process-last-pos (point-min)))))))))
(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-session-event chess-current-session
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)))))))
(defun chess-process-let (forms)
`(let ((str (progn ,@forms)))
(if (stringp str)
(ignore
(process-send-string (get-buffer-process (current-buffer))
(concat str "\n")))
str)))
(defun chess-process-insert-forms (event)
(if (assq event forms)
(chess-process-let
(prog1
(cdr (assq event forms))
(setq forms (assq-delete-all event forms))))))
(defmacro define-chess-engine (name ignored triggers &rest forms)
"Define a chess engine.
NAME is an unquoted symbol name that denotes the engine. This name is
used as the default string for the chess engine's external command
name.
TRIGGERS is a list of process triggers, which fire when the output
from the process matches certain regexps. See
`chess-process-triggers' for more information.
FORMS is an alist of event symbols, and forms to evaluate when such an
event is received by the module. If these forms return a string, this
string will be sent to the engine process.
See the file chess-engines.el for code examples."
(let ((namestr (symbol-name name)))
`(progn
(defcustom ,(intern (concat "chess-" namestr "-command"))
(and (require 'executable)
(executable-find ,namestr))
,(concat "The name of the " namestr " program.")
:type 'file
:group 'chess-process)
(defun ,(intern (concat "chess-" namestr))
(session buffer event &rest args)
(cond
((eq event 'initialize)
(with-current-buffer
(chess-process session buffer event ,triggers
,(intern (concat "chess-" namestr "-command")))
,(chess-process-insert-forms 'init)
(current-buffer)))
((eq event 'shutdown)
(when (buffer-live-p buffer)
(ignore-errors
,(chess-process-insert-forms 'shutdown))
(kill-buffer buffer)))
(t
(ignore
(with-current-buffer buffer
(cond
((eq event 'setup)
(apply 'chess-process session buffer event args)
,(chess-process-insert-forms 'setup))
,@(mapcar
(function
(lambda (entry)
`((eq event (quote ,(car entry)))
,(chess-process-let (cdr entry))))) forms)
(t
(apply 'chess-process session buffer event args)))))))))))
(provide 'chess-process)
;;; chess-process.el ends here
|
