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+;;; ob-oz.el --- Org-babel functions for Oz evaluation
+;; Copyright (C) 2009-2013 Torsten Anders and Eric Schulte
+;; Author: Torsten Anders and Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage:
+;; Version: 0.02
+;; This file is not part of GNU Emacs.
+;; This program 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 3, or (at your option)
+;; any later version.
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; 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., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+;;; Commentary:
+;; Org-Babel support for evaluating Oz source code.
+;; Oz code is always send to the Oz Programming Environment (OPI), the
+;; Emacs mode and compiler interface for Oz programs. Therefore, only
+;; session mode is supported. In practice, non-session code blocks are
+;; handled equally well by the session mode. However, only a single
+;; session is supported. Consequently, the :session header argument is
+;; ignored.
+;; The Org-babel header argument :results is interpreted as
+;; follows. :results output requires the respective code block to be
+;; an Oz statement and :results value requires an Oz
+;; expression. Currently, results are only supported for expressions
+;; (i.e. the result of :results output is always nil).
+;; Expression evaluation happens synchronously. Therefore there is an
+;; additional header argument :wait-time <number>, which specifies the
+;; maximum time to wait for the result of a given expression. nil
+;; means to wait as long as it takes to get a result (potentially wait
+;; forever).
+;; NOTE: Currently the copyright of this file may not be in a state to
+;; permit inclusion as core software into Emacs or Org-mode.
+;;; Requirements:
+;; - Mozart Programming System, the implementation of the Oz
+;; programming language (, which includes
+;; the major mode mozart for editing Oz programs.
+;; - StartOzServer.oz which is located in the contrib/scripts
+;; directory of the Org-mode repository
+;;; TODO:
+;; - Decide: set communication to \\switch -threadedqueries?
+;; - Only start Oz compiler when required, e.g., load Org-babel only when needed?
+;; - Avoid synchronous evaluation to avoid blocking Emacs (complex
+;; Strasheela programs can take long to find a result..). In order
+;; to cleanly map code blocks to their associated results (which can
+;; arrive then in any order) I could use IDs
+;; (e.g. integers). However, how do I do concurrency in Emacs Lisp,
+;; and how can I define org-babel-execute:oz concurrently.
+;; - Expressions are rarely used in Oz at the top-level, and using
+;; them in documentation and Literate Programs will cause
+;; confusion. Idea: hide expression from reader and instead show
+;; them statement (e.g., MIDI output statement) and then include
+;; result in Org file. Implementation: for expressions (:results
+;; value) support an additional header argument that takes arbitrary
+;; Oz code. This code is not seen by the reader, but will be used
+;; for the actual expression at the end. Alternative: feed all
+;; relevant code as statement (:results output), then add expression
+;; as extra code block which outputs, e.g., file name (so the file
+;; name must be accessible by global var), but the code of this
+;; extra codeblock is not seen. Hm, in that case it might be even
+;; more easy to manually add this link to the Org file.
+(require 'ob)
+;;; major mode for editing Oz programs
+(require 'mozart)
+;; Interface to communicate with Oz.
+;; (1) For statements without any results: oz-send-string
+;; (2) For expressions with a single result: oz-send-string-expression
+;; (defined in org-babel-oz-ResultsValue.el)
+;; oz-send-string-expression implements an additional very direct
+;; communication between Org-babel and the Oz compiler. Communication
+;; with the Oz server works already without this code via the function
+;; oz-send-string from, but this function does not get
+;; back any results from Oz to Emacs. The following code creates a
+;; socket for sending code to the OPI compiler and results are
+;; returned by the same socket. On the Oz side, a socket is opened and
+;; conected to the compiler of the OPI (via oz-send-string). On the
+;; Emacs side, a connection to this socket is created for feeding code
+;; and receiving results. This additional communication channel to the
+;; OPI compiler ensures that results are returned cleanly (e.g., only
+;; the result of the sent code is returned, no parsing or any
+;; processing of *Oz Emulator* is required).
+;; There is no buffer, nor sentinel involved. Oz code is send
+;; directly, and results from Oz are send back, but Emacs Lisp
+;; requires a filter function for processing results.
+(defvar org-babel-oz-server-dir
+ (file-name-as-directory
+ (expand-file-name
+ "contrib/scripts"
+ (file-name-as-directory
+ (expand-file-name
+ "../../.."
+ (file-name-directory (or load-file-name buffer-file-name))))))
+ "Path to the contrib/scripts directory in which
+StartOzServer.oz is located.")
+(defvar org-babel-oz-port 6001
+ "Port for communicating with Oz compiler.")
+(defvar org-babel-oz-OPI-socket nil
+ "Socket for communicating with OPI.")
+(defvar org-babel-oz-collected-result nil
+ "Aux var to hand result from org-babel-oz-filter to oz-send-string-expression.")
+(defun org-babel-oz-filter (proc string)
+ "Processes output from socket org-babel-oz-OPI-socket."
+;; (setq org-babel-oz-collected-results (cons string org-babel-oz-collected-results))
+ (setq org-babel-oz-collected-result string)
+ )
+(defun org-babel-oz-create-socket ()
+ (message "Create OPI socket for evaluating expressions")
+ ;; Start Oz directly
+ (run-oz)
+ ;; Create socket on Oz side (after Oz was started).
+ (oz-send-string (concat "\\insert '" org-babel-oz-server-dir "StartOzServer.oz'"))
+ ;; Wait until socket is created before connecting to it.
+ ;; Quick hack: wait 3 sec
+ ;;
+ ;; extending time to 30 secs does not help when starting Emacs for
+ ;; the first time (and computer does nothing else)
+ (sit-for 3)
+ ;; connect to OPI socket
+ (setq org-babel-oz-OPI-socket
+ ;; Creates a socket. I/O interface of Emacs sockets as for processes.
+ (open-network-stream "*Org-babel-OPI-socket*" nil "localhost" org-babel-oz-port))
+ ;; install filter
+ (set-process-filter org-babel-oz-OPI-socket #'org-babel-oz-filter)
+;; communication with org-babel-oz-OPI-socket is asynchronous, but
+;; oz-send-string-expression turns is into synchronous...
+(defun oz-send-string-expression (string &optional wait-time)
+ "Similar to oz-send-string, oz-send-string-expression sends a string to the OPI compiler. However, string must be expression and this function returns the result of the expression (as string). oz-send-string-expression is synchronous, wait-time allows to specify a maximum wait time. After wait-time is over with no result, the function returns nil."
+ (if (not org-babel-oz-OPI-socket)
+ (org-babel-oz-create-socket))
+ (let ((polling-delay 0.1)
+ result)
+ (process-send-string org-babel-oz-OPI-socket string)
+ ;; wait for result
+ (if wait-time
+ (let ((waited 0))
+ (unwind-protect
+ (progn
+ (while
+ ;; stop loop if org-babel-oz-collected-result \= nil or waiting time is over
+ (not (or (not (equal org-babel-oz-collected-result nil))
+ (> waited wait-time)))
+ (progn
+ (sit-for polling-delay)
+;; (message "org-babel-oz: next polling iteration")
+ (setq waited (+ waited polling-delay))))
+;; (message "org-babel-oz: waiting over, got result or waiting timed out")
+;; (message (format "wait-time: %s, waited: %s" wait-time waited))
+ (setq result org-babel-oz-collected-result)
+ (setq org-babel-oz-collected-result nil))))
+ (unwind-protect
+ (progn
+ (while (equal org-babel-oz-collected-result nil)
+ (sit-for polling-delay))
+ (setq result org-babel-oz-collected-result)
+ (setq org-babel-oz-collected-result nil))))
+ result))
+(defun org-babel-expand-body:oz (body params)
+ (let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
+ (if vars
+ ;; prepend code to define all arguments passed to the code block
+ (let ((var-string (mapcar (lambda (pair)
+ (format "%s=%s"
+ (car pair)
+ (org-babel-oz-var-to-oz (cdr pair))))
+ vars)))
+ ;; only add var declarations if any variables are there
+ (mapconcat #'identity
+ (append (list "local") var-string (list "in" body "end"))
+ "\n"))
+ body)))
+(defun org-babel-execute:oz (body params)
+ "Execute a block of Oz code with org-babel. This function is
+called by `org-babel-execute-src-block' via multiple-value-bind."
+ (let* ((result-params (cdr (assoc :result-params params)))
+ (full-body (org-babel-expand-body:oz body params))
+ (wait-time (plist-get params :wait-time)))
+ ;; actually execute the source-code block
+ (org-babel-reassemble-table
+ (cond
+ ((member "output" result-params)
+ (message "Org-babel: executing Oz statement")
+ (oz-send-string full-body))
+ ((member "value" result-params)
+ (message "Org-babel: executing Oz expression")
+ (oz-send-string-expression full-body (or wait-time 1)))
+ (t (error "either 'output' or 'results' must be members of :results.")))
+ (org-babel-pick-name (cdr (assoc :colname-names params))
+ (cdr (assoc :colnames params)))
+ (org-babel-pick-name (cdr (assoc :roname-names params))
+ (cdr (assoc :rownames params))))))
+;; This function should be used to assign any variables in params in
+;; the context of the session environment.
+(defun org-babel-prep-session:oz (session params)
+ "Prepare SESSION according to the header arguments specified in PARAMS."
+ (error "org-babel-prep-session:oz unimplemented"))
+;; TODO: testing... (copied from org-babel-haskell.el)
+;; (defun org-babel-prep-session:oz (session params)
+;; "Prepare SESSION according to the header arguments specified in PARAMS."
+;; (save-window-excursion
+;; (org-babel-oz-initiate-session session)
+;; (let* ((vars (org-babel-ref-variables params))
+;; (var-lines (mapconcat ;; define any variables
+;; (lambda (pair)
+;; (format "%s=%s"
+;; (car pair)
+;; (org-babel-ruby-var-to-ruby (cdr pair))))
+;; vars "\n"))
+;; (vars-file (concat (make-temp-file "org-babel-oz-vars") ".oz")))
+;; (when vars
+;; (with-temp-buffer
+;; (insert var-lines) (write-file vars-file)
+;; (oz-mode)
+;; ;; (inferior-oz-load-file) ; ??
+;; ))
+;; (current-buffer))))
+;; TODO: testing... (simplified version of def in org-babel-prep-session:ocaml)
+;; BUG: does not work yet. Error: ad-Orig-error: buffer none doesn't exist or has no process
+(defun org-babel-oz-initiate-session (&optional session params)
+ "If there is not a current inferior-process-buffer in SESSION
+then create. Return the initialized session."
+ (unless (string= session "none")
+ ;; TODO: make it possible to have multiple sessions
+ (save-window-excursion
+ ;; (run-oz)
+ (get-buffer oz-compiler-buffer))))
+(defun org-babel-oz-var-to-oz (var)
+ "Convert an elisp var into a string of Oz source code
+specifying a var of the same value."
+ (if (listp var)
+;; (concat "[" (mapconcat #'org-babel-oz-var-to-oz var ", ") "]")
+ (eval var)
+ (format "%s" var) ; don't preserve string quotes.
+;; (format "%s" var)
+ ))
+;; TODO:
+(defun org-babel-oz-table-or-string (results)
+ "If the results look like a table, then convert them into an
+Emacs-lisp table, otherwise return the results as a string."
+ (error "org-babel-oz-table-or-string unimplemented"))
+(provide 'ob-oz)
+;;; org-babel-oz.el ends here