summaryrefslogtreecommitdiff
path: root/lisp/org/ob-js.el
blob: 4e4c3abfa158dc88f34588974d374250fe6e7035 (plain)
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
;;; ob-js.el --- org-babel functions for Javascript

;; Copyright (C) 2010-2013 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