Imported Upstream version 7.9.2

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+;;; ob-js.el --- org-babel functions for Javascript
+
+;; Copyright (C) 2010-2012  Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research, js
+;; Homepage: http://orgmode.org
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Now working with SBCL for both session and external evaluation.
+;;
+;; This certainly isn't optimally robust, but it seems to be working
+;; for the basic use cases.
+
+;;; Requirements:
+
+;; - a non-browser javascript engine such as node.js http://nodejs.org/
+;;   or mozrepl http://wiki.github.com/bard/mozrepl/
+;;
+;; - for session based evaluation mozrepl and moz.el are required see
+;;   http://wiki.github.com/bard/mozrepl/emacs-integration for
+;;   configuration instructions
+
+;;; Code:
+(require 'ob)
+(require 'ob-ref)
+(require 'ob-comint)
+(require 'ob-eval)
+(eval-when-compile (require 'cl))
+
+(declare-function run-mozilla "ext:moz" (arg))
+
+(defvar org-babel-default-header-args:js '()
+  "Default header arguments for js code blocks.")
+
+(defvar org-babel-js-eoe "org-babel-js-eoe"
+  "String to indicate that evaluation has completed.")
+
+(defcustom org-babel-js-cmd "node"
+  "Name of command used to evaluate js blocks."
+  :group 'org-babel
+  :version "24.1"
+  :type 'string)
+
+(defvar org-babel-js-function-wrapper
+  "require('sys').print(require('sys').inspect(function(){%s}()));"
+  "Javascript code to print value of body.")
+
+(defun org-babel-execute:js (body params)
+  "Execute a block of Javascript code with org-babel.
+This function is called by `org-babel-execute-src-block'"
+  (let* ((org-babel-js-cmd (or (cdr (assoc :cmd params)) org-babel-js-cmd))
+         (result-type (cdr (assoc :result-type params)))
+         (full-body (org-babel-expand-body:generic
+		     body params (org-babel-variable-assignments:js params))))
+    (org-babel-js-read
+     (if (not (string= (cdr (assoc :session params)) "none"))
+	 ;; session evaluation
+         (let ((session (org-babel-prep-session:js
+			 (cdr (assoc :session params)) params)))
+	   (nth 1
+		(org-babel-comint-with-output
+		    (session (format "%S" org-babel-js-eoe) t body)
+		  (mapc
+		   (lambda (line)
+		     (insert (org-babel-chomp line)) (comint-send-input nil t))
+		   (list body (format "%S" org-babel-js-eoe))))))
+       ;; external evaluation
+       (let ((script-file (org-babel-temp-file "js-script-")))
+         (with-temp-file script-file
+           (insert
+            ;; return the value or the output
+            (if (string= result-type "value")
+                (format org-babel-js-function-wrapper full-body)
+              full-body)))
+         (org-babel-eval
+	  (format "%s %s" org-babel-js-cmd
+		  (org-babel-process-file-name script-file)) ""))))))
+
+(defun org-babel-js-read (results)
+  "Convert RESULTS into an appropriate elisp value.
+If RESULTS look like a table, then convert them into an
+Emacs-lisp table, otherwise return the results as a string."
+  (org-babel-read
+   (if (and (stringp results) (string-match "^\\[.+\\]$" results))
+       (org-babel-read
+        (concat "'"
+                (replace-regexp-in-string
+                 "\\[" "(" (replace-regexp-in-string
+                            "\\]" ")" (replace-regexp-in-string
+                                       ", " " " (replace-regexp-in-string
+						 "'" "\"" results))))))
+     results)))
+
+(defun org-babel-js-var-to-js (var)
+  "Convert VAR into a js variable.
+Convert an elisp value into a string of js source code
+specifying a variable of the same value."
+  (if (listp var)
+      (concat "[" (mapconcat #'org-babel-js-var-to-js var ", ") "]")
+    (format "%S" var)))
+
+(defun org-babel-prep-session:js (session params)
+  "Prepare SESSION according to the header arguments specified in PARAMS."
+  (let* ((session (org-babel-js-initiate-session session))
+	 (var-lines (org-babel-variable-assignments:js params)))
+    (when session
+      (org-babel-comint-in-buffer session
+	(sit-for .5) (goto-char (point-max))
+	(mapc (lambda (var)
+		(insert var) (comint-send-input nil t)
+		(org-babel-comint-wait-for-output session)
+		(sit-for .1) (goto-char (point-max))) var-lines)))
+    session))
+
+(defun org-babel-variable-assignments:js (params)
+  "Return list of Javascript statements assigning the block's variables."
+  (mapcar
+   (lambda (pair) (format "var %s=%s;"
+			  (car pair) (org-babel-js-var-to-js (cdr pair))))
+   (mapcar #'cdr (org-babel-get-header params :var))))
+
+(defun org-babel-js-initiate-session (&optional session)
+  "If there is not a current inferior-process-buffer in SESSION
+then create.  Return the initialized session."
+  (unless (string= session "none")
+    (cond
+     ((string= "mozrepl" org-babel-js-cmd)
+      (require 'moz)
+      (let ((session-buffer (save-window-excursion
+			      (run-mozilla nil)
+			      (rename-buffer session)
+			      (current-buffer))))
+	(if (org-babel-comint-buffer-livep session-buffer)
+	    (progn (sit-for .25) session-buffer)
+	  (sit-for .5)
+	  (org-babel-js-initiate-session session))))
+     ((string= "node" org-babel-js-cmd )
+      (error "Session evaluation with node.js is not supported"))
+     (t
+      (error "Sessions are only supported with mozrepl add \":cmd mozrepl\"")))))
+
+(provide 'ob-js)
+
+
+
+;;; ob-js.el ends here