lisp/ob-js.el

   1 ;;; ob-js.el --- Babel Functions for Javascript      -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2010-2018 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research, js
   7 ;; Homepage: https://orgmode.org
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Now working with SBCL for both session and external evaluation.
  27 ;;
  28 ;; This certainly isn't optimally robust, but it seems to be working
  29 ;; for the basic use cases.
  30
  31 ;;; Requirements:
  32
  33 ;; - a non-browser javascript engine such as node.js http://nodejs.org/
  34 ;;   or mozrepl http://wiki.github.com/bard/mozrepl/
  35 ;;
  36 ;; - for session based evaluation mozrepl and moz.el are required see
  37 ;;   http://wiki.github.com/bard/mozrepl/emacs-integration for
  38 ;;   configuration instructions
  39
  40 ;;; Code:
  41 (require 'ob)
  42
  43 (declare-function run-mozilla "ext:moz" (arg))
  44 (declare-function httpd-start "simple-httpd" ())
  45 (declare-function run-skewer "skewer-mode" ())
  46 (declare-function indium-run-node "indium-nodejs" (command))
  47 (declare-function indium-eval "indium-interaction" (string &optional callback))
  48
  49 (defvar org-babel-default-header-args:js '()
  50   "Default header arguments for js code blocks.")
  51
  52 (defvar org-babel-js-eoe "org-babel-js-eoe"
  53   "String to indicate that evaluation has completed.")
  54
  55 (defcustom org-babel-js-cmd "node"
  56   "Name of command used to evaluate js blocks."
  57   :group 'org-babel
  58   :version "24.1"
  59   :type '(choice (const "node")
  60                  (const "mozrepl")
  61                  (const "skewer-mode")
  62                  (const "indium")
  63                  (const "js-comint"))
  64   :safe #'stringp)
  65
  66 (defvar org-babel-js-function-wrapper
  67   "require('sys').print(require('sys').inspect(function(){\n%s\n}()));"
  68   "Javascript code to print value of body.")
  69
  70 (defun org-babel-execute:js (body params)
  71   "Execute a block of Javascript code with org-babel.
  72 This function is called by `org-babel-execute-src-block'"
  73   (let* ((org-babel-js-cmd (or (cdr (assq :cmd params)) org-babel-js-cmd))
  74          (session (cdr (assq :session params)))
  75          (result-type (cdr (assq :result-type params)))
  76          (full-body (org-babel-expand-body:generic
  77                      body params (org-babel-variable-assignments:js params)))
  78          (result (cond
  79                   ;; no session specified, external evaluation
  80                   ((string= session "none")
  81                    (let ((script-file (org-babel-temp-file "js-script-")))
  82                      (with-temp-file script-file
  83                        (insert
  84                         ;; return the value or the output
  85                         (if (string= result-type "value")
  86                             (format org-babel-js-function-wrapper full-body)
  87                           full-body)))
  88                      (org-babel-eval
  89                       (format "%s %s" org-babel-js-cmd
  90                               (org-babel-process-file-name script-file)) "")))
  91                   ;; Indium Node REPL
  92                   ;; separate case because Indium REPL is not inherited from comint-mode
  93                   ((string= session "*JS REPL*")
  94                    (require 'indium-repl)
  95                    (unless (get-buffer session)
  96                      (indium-run-node))
  97                    (indium-eval full-body))
  98                   ;; session evaluation
  99                   (t
 100                    (let ((session (org-babel-prep-session:js
 101                                    (cdr (assq :session params)) params)))
 102                      (nth 1
 103                           (org-babel-comint-with-output
 104                               (session (format "%S" org-babel-js-eoe) t body)
 105                             (dolist (code (list body (format "%S" org-babel-js-eoe)))
 106                               (insert (org-babel-chomp code))
 107                               (comint-send-input nil t)))))))))
 108     (org-babel-result-cond (cdr (assq :result-params params))
 109       result (org-babel-js-read result))))
 110
 111 (defun org-babel-js-read (results)
 112   "Convert RESULTS into an appropriate elisp value.
 113 If RESULTS look like a table, then convert them into an
 114 Emacs-lisp table, otherwise return the results as a string."
 115   (org-babel-read
 116    (if (and (stringp results)
 117             (string-prefix-p "[" results)
 118             (string-suffix-p "]" results))
 119        (org-babel-read
 120         (concat "'"
 121                 (replace-regexp-in-string
 122                  "\\[" "(" (replace-regexp-in-string
 123                             "\\]" ")" (replace-regexp-in-string
 124                                        ",[[:space:]]" " "
 125                                        (replace-regexp-in-string
 126                                         "'" "\"" results))))))
 127      results)))
 128
 129 (defun org-babel-js-var-to-js (var)
 130   "Convert VAR into a js variable.
 131 Convert an elisp value into a string of js source code
 132 specifying a variable of the same value."
 133   (if (listp var)
 134       (concat "[" (mapconcat #'org-babel-js-var-to-js var ", ") "]")
 135     (replace-regexp-in-string "\n" "\\\\n" (format "%S" var))))
 136
 137 (defun org-babel-prep-session:js (session params)
 138   "Prepare SESSION according to the header arguments specified in PARAMS."
 139   (let* ((session (org-babel-js-initiate-session session))
 140          (var-lines (org-babel-variable-assignments:js params)))
 141     (when session
 142       (org-babel-comint-in-buffer session
 143         (goto-char (point-max))
 144         (dolist (var var-lines)
 145           (insert var)
 146           (comint-send-input nil t)
 147           (org-babel-comint-wait-for-output session)
 148           (sit-for .1)
 149           (goto-char (point-max)))))
 150     session))
 151
 152 (defun org-babel-variable-assignments:js (params)
 153   "Return list of Javascript statements assigning the block's variables."
 154   (mapcar
 155    (lambda (pair) (format "var %s=%s;"
 156                           (car pair) (org-babel-js-var-to-js (cdr pair))))
 157    (org-babel--get-vars params)))
 158
 159 (defun org-babel-js-initiate-session (&optional session)
 160   "If there is not a current inferior-process-buffer in SESSION
 161 then create.  Return the initialized session."
 162   (cond
 163    ((string= session "none")
 164     (warn "Session evaluation of ob-js is not supported"))
 165    ((string= "*skewer-repl*" session)
 166     (require 'skewer-repl)
 167     (let ((session-buffer (get-buffer "*skewer-repl*")))
 168       (if (and (org-babel-comint-buffer-livep (get-buffer session-buffer))
 169                (comint-check-proc session-buffer))
 170           session-buffer
 171         ;; start skewer REPL.
 172         (httpd-start)
 173         (run-skewer)
 174         session-buffer)))
 175    ((string= "*Javascript REPL*" session)
 176     (require 'js-comint)
 177     (let ((session-buffer "*Javascript REPL*"))
 178       (if (and (org-babel-comint-buffer-livep (get-buffer session-buffer))
 179                (comint-check-proc session-buffer))
 180           session-buffer
 181         (call-interactively 'run-js)
 182         (sit-for .5)
 183         session-buffer)))
 184    ((string= "mozrepl" org-babel-js-cmd)
 185     (require 'moz)
 186     (let ((session-buffer (save-window-excursion
 187                             (run-mozilla nil)
 188                             (rename-buffer session)
 189                             (current-buffer))))
 190       (if (org-babel-comint-buffer-livep session-buffer)
 191           (progn (sit-for .25) session-buffer)
 192         (sit-for .5)
 193         (org-babel-js-initiate-session session))))
 194    ((string= "node" org-babel-js-cmd )
 195     (error "Session evaluation with node.js is not supported"))
 196    (t
 197     (error "Sessions are only supported with mozrepl add \":cmd mozrepl\""))))
 198
 199 (provide 'ob-js)
 200
 201
 202
 203 ;;; ob-js.el ends here