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125 lines
4.3 KiB
EmacsLisp
125 lines
4.3 KiB
EmacsLisp
;;; ob-scala.el --- org-babel functions for Scala evaluation
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;; Copyright (C) 2012-2013 Free Software Foundation, Inc.
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;; Author: Andrzej Lichnerowicz
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://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 <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Currently only supports the external execution. No session support yet.
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;;; Requirements:
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;; - Scala language :: http://www.scala-lang.org/
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;; - Scala major mode :: Can be installed from Scala sources
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;; https://github.com/scala/scala-dist/blob/master/tool-support/src/emacs/scala-mode.el
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;;; Code:
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(require 'ob)
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(eval-when-compile (require 'cl))
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(defvar org-babel-tangle-lang-exts) ;; Autoloaded
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(add-to-list 'org-babel-tangle-lang-exts '("scala" . "scala"))
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(defvar org-babel-default-header-args:scala '())
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(defvar org-babel-scala-command "scala"
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"Name of the command to use for executing Scala code.")
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(defun org-babel-execute:scala (body params)
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"Execute a block of Scala code with org-babel. This function is
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called by `org-babel-execute-src-block'"
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(message "executing Scala source code block")
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(let* ((processed-params (org-babel-process-params params))
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(session (org-babel-scala-initiate-session (nth 0 processed-params)))
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(vars (nth 1 processed-params))
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(result-params (nth 2 processed-params))
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(result-type (cdr (assoc :result-type params)))
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(full-body (org-babel-expand-body:generic
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body params))
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(result (org-babel-scala-evaluate
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session full-body result-type result-params)))
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(org-babel-reassemble-table
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result
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(org-babel-pick-name
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(cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
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(org-babel-pick-name
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(cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
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(defun org-babel-scala-table-or-string (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-script-escape results))
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(defvar org-babel-scala-wrapper-method
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"var str_result :String = null;
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Console.withOut(new java.io.OutputStream() {def write(b: Int){
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}}) {
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str_result = {
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%s
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}.toString
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}
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print(str_result)
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")
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(defun org-babel-scala-evaluate
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(session body &optional result-type result-params)
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"Evaluate BODY in external Scala process.
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If RESULT-TYPE equals 'output then return standard output as a string.
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If RESULT-TYPE equals 'value then return the value of the last statement
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in BODY as elisp."
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(when session (error "Sessions are not (yet) supported for Scala"))
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(case result-type
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(output
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(let ((src-file (org-babel-temp-file "scala-")))
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(progn (with-temp-file src-file (insert body))
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(org-babel-eval
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(concat org-babel-scala-command " " src-file) ""))))
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(value
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(let* ((src-file (org-babel-temp-file "scala-"))
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(wrapper (format org-babel-scala-wrapper-method body)))
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(with-temp-file src-file (insert wrapper))
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(let ((raw (org-babel-eval
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(concat org-babel-scala-command " " src-file) "")))
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(org-babel-result-cond result-params
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raw
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(org-babel-scala-table-or-string raw)))))))
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(defun org-babel-prep-session:scala (session params)
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"Prepare SESSION according to the header arguments specified in PARAMS."
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(error "Sessions are not (yet) supported for Scala"))
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(defun org-babel-scala-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. Sessions are not
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supported in Scala."
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nil)
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(provide 'ob-scala)
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;;; ob-scala.el ends here
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