;;; ob-js.el --- Babel Functions for Javascript -*- lexical-binding: t; -*-
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;; Copyright (C) 2010-2018 Free Software Foundation, Inc.
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research, js
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Now working with SBCL for both session and external evaluation.
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;;
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;; This certainly isn't optimally robust, but it seems to be working
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;; for the basic use cases.
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;;; Requirements:
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;; - a non-browser javascript engine such as node.js http://nodejs.org/
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;; or mozrepl http://wiki.github.com/bard/mozrepl/
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;;
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;; - for session based evaluation mozrepl and moz.el are required see
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;; http://wiki.github.com/bard/mozrepl/emacs-integration for
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;; configuration instructions
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;;; Code:
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(require 'ob)
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(declare-function run-mozilla "ext:moz" (arg))
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(defvar org-babel-default-header-args:js '()
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"Default header arguments for js code blocks.")
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(defvar org-babel-js-eoe "org-babel-js-eoe"
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"String to indicate that evaluation has completed.")
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(defcustom org-babel-js-cmd "node"
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"Name of command used to evaluate js blocks."
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:group 'org-babel
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:version "24.1"
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:type 'string)
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(defvar org-babel-js-function-wrapper
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"require('sys').print(require('sys').inspect(function(){\n%s\n}()));"
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"Javascript code to print value of body.")
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(defun org-babel-execute:js (body params)
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"Execute a block of Javascript code with org-babel.
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This function is called by `org-babel-execute-src-block'"
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(let* ((org-babel-js-cmd (or (cdr (assq :cmd params)) org-babel-js-cmd))
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(result-type (cdr (assq :result-type params)))
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(full-body (org-babel-expand-body:generic
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body params (org-babel-variable-assignments:js params)))
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(result (if (not (string= (cdr (assq :session params)) "none"))
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;; session evaluation
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(let ((session (org-babel-prep-session:js
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(cdr (assq :session params)) params)))
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(nth 1
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(org-babel-comint-with-output
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(session (format "%S" org-babel-js-eoe) t body)
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(mapc
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(lambda (line)
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(insert (org-babel-chomp line))
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(comint-send-input nil t))
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(list body (format "%S" org-babel-js-eoe))))))
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;; external evaluation
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(let ((script-file (org-babel-temp-file "js-script-")))
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(with-temp-file script-file
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(insert
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;; return the value or the output
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(if (string= result-type "value")
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(format org-babel-js-function-wrapper full-body)
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full-body)))
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(org-babel-eval
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(format "%s %s" org-babel-js-cmd
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(org-babel-process-file-name script-file)) "")))))
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(org-babel-result-cond (cdr (assq :result-params params))
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result (org-babel-js-read result))))
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(defun org-babel-js-read (results)
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"Convert RESULTS into an appropriate elisp value.
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If RESULTS look like a table, then convert them into an
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Emacs-lisp table, otherwise return the results as a string."
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(org-babel-read
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(if (and (stringp results)
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(string-prefix-p "[" results)
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(string-suffix-p "]" results))
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(org-babel-read
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(concat "'"
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(replace-regexp-in-string
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"\\[" "(" (replace-regexp-in-string
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"\\]" ")" (replace-regexp-in-string
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",[[:space:]]" " "
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(replace-regexp-in-string
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"'" "\"" results))))))
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results)))
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(defun org-babel-js-var-to-js (var)
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"Convert VAR into a js variable.
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Convert an elisp value into a string of js source code
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specifying a variable of the same value."
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(if (listp var)
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(concat "[" (mapconcat #'org-babel-js-var-to-js var ", ") "]")
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(replace-regexp-in-string "\n" "\\\\n" (format "%S" var))))
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(defun org-babel-prep-session:js (session params)
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"Prepare SESSION according to the header arguments specified in PARAMS."
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(let* ((session (org-babel-js-initiate-session session))
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(var-lines (org-babel-variable-assignments:js params)))
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(when session
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(org-babel-comint-in-buffer session
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(sit-for .5) (goto-char (point-max))
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(mapc (lambda (var)
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(insert var) (comint-send-input nil t)
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(org-babel-comint-wait-for-output session)
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(sit-for .1) (goto-char (point-max))) var-lines)))
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session))
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(defun org-babel-variable-assignments:js (params)
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"Return list of Javascript statements assigning the block's variables."
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(mapcar
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(lambda (pair) (format "var %s=%s;"
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(car pair) (org-babel-js-var-to-js (cdr pair))))
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(org-babel--get-vars params)))
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(defun org-babel-js-initiate-session (&optional session)
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"If there is not a current inferior-process-buffer in SESSION
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then create. Return the initialized session."
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(unless (string= session "none")
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(cond
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((string= "mozrepl" org-babel-js-cmd)
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(require 'moz)
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(let ((session-buffer (save-window-excursion
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(run-mozilla nil)
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(rename-buffer session)
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(current-buffer))))
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(if (org-babel-comint-buffer-livep session-buffer)
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(progn (sit-for .25) session-buffer)
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(sit-for .5)
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(org-babel-js-initiate-session session))))
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((string= "node" org-babel-js-cmd )
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(error "Session evaluation with node.js is not supported"))
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(t
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(error "Sessions are only supported with mozrepl add \":cmd mozrepl\"")))))
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(provide 'ob-js)
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;;; ob-js.el ends here
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