lisp/ob-J.el

   1 ;;; ob-J.el --- org-babel functions for J evaluation
   2
   3 ;; Copyright (C) 2011-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Oleh Krehel
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://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 <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Org-Babel support for evaluating J code.
  27 ;;
  28 ;; Session interaction depends on `j-console' from package `j-mode'
  29 ;; (available in MELPA).
  30
  31 ;;; Code:
  32 (require 'ob)
  33
  34 (declare-function org-trim "org" (S))
  35 (declare-function j-console-ensure-session "ext:j-console" ())
  36
  37 (defun org-babel-expand-body:J (body params &optional processed-params)
  38   "Expand BODY according to PARAMS, return the expanded body.
  39 PROCESSED-PARAMS isn't used yet."
  40   (org-babel-J-interleave-echos-except-functions body))
  41
  42 (defun org-babel-J-interleave-echos (body)
  43   "Interleave echo',' between each source line of BODY."
  44   (mapconcat #'identity (split-string body "\n") "\necho','\n"))
  45
  46 (defun org-babel-J-interleave-echos-except-functions (body)
  47   "Interleave echo',' between source lines of BODY that aren't functions."
  48   (if (obj-string-match-m "\\(?:^\\|\n\\)[^\n]*\\(?:0\\|1\\|2\\|3\\|4\\|dyad\\) : 0\n.*\n)\\(?:\n\\|$\\)" body)
  49       (let ((s1 (substring body 0 (match-beginning 0)))
  50             (s2 (match-string 0 body))
  51             (s3 (substring body (match-end 0))))
  52         (concat
  53          (if (string= s1 "")
  54              ""
  55            (concat (org-babel-J-interleave-echos s1)
  56                    "\necho','\n"))
  57          s2
  58          "\necho','\n"
  59          (org-babel-J-interleave-echos-except-functions s3)))
  60     (org-babel-J-interleave-echos body)))
  61
  62 (defun org-babel-execute:J (body params)
  63   "Execute a block of J code BODY.
  64 PARAMS are given by org-babel.
  65 This function is called by `org-babel-execute-src-block'"
  66   (message "executing J source code block")
  67   (let* ((processed-params (org-babel-process-params params))
  68          (sessionp (cdr (assoc :session params)))
  69          (session (org-babel-j-initiate-session sessionp))
  70          (vars (nth 2 processed-params))
  71          (result-params (nth 3 processed-params))
  72          (result-type (nth 4 processed-params))
  73          (full-body (org-babel-expand-body:J
  74                      body params processed-params))
  75          (tmp-script-file (org-babel-temp-file "J-src")))
  76     (org-babel-J-strip-whitespace
  77      (if (string= sessionp "none")
  78          (progn
  79            (with-temp-file tmp-script-file
  80              (insert full-body))
  81            (org-babel-eval (format "jconsole < %s" tmp-script-file) ""))
  82        (org-babel-J-eval-string full-body)))))
  83
  84 (defun org-babel-J-eval-string (str)
  85   "Sends STR to the `j-console-cmd' session and exectues it."
  86   (let ((session (j-console-ensure-session)))
  87     (with-current-buffer (process-buffer session)
  88       (goto-char (point-max))
  89       (insert (format "\n%s\n" str))
  90       (let ((beg (point)))
  91         (comint-send-input)
  92         (sit-for .1)
  93         (buffer-substring-no-properties
  94          beg (point-max))))))
  95
  96 (defun org-babel-J-strip-whitespace (str)
  97   "Remove whitespace from jconsole output STR."
  98   (mapconcat
  99    #'identity
 100    (delete "" (mapcar
 101                #'org-babel-J-print-block
 102                (split-string str "^ *,\n" t)))
 103    "\n\n"))
 104
 105 (defun obj-get-string-alignment (str)
 106   "Return a number to describe STR alignment.
 107 STR represents a table.
 108 Positive/negative/zero result means right/left/undetermined.
 109 Don't trust first line."
 110   (let* ((str (org-trim str))
 111          (lines (split-string str "\n" t))
 112          n1 n2)
 113     (cond ((<= (length lines) 1)
 114            0)
 115           ((= (length lines) 2)
 116            ;; numbers are right-aligned
 117            (if (and
 118                 (numberp (read (car lines)))
 119                 (numberp (read (cadr lines)))
 120                 (setq n1 (obj-match-second-space-right (nth 0 lines)))
 121                 (setq n2 (obj-match-second-space-right (nth 1 lines))))
 122                n2
 123              0))
 124           ((not (obj-match-second-space-left (nth 0 lines)))
 125            0)
 126           ((and
 127             (setq n1 (obj-match-second-space-left (nth 1 lines)))
 128             (setq n2 (obj-match-second-space-left (nth 2 lines)))
 129             (= n1 n2))
 130            n1)
 131           ((and
 132             (setq n1 (obj-match-second-space-right (nth 1 lines)))
 133             (setq n2 (obj-match-second-space-right (nth 2 lines)))
 134             (= n1 n2))
 135            (- n1))
 136           (t 0))))
 137
 138 (defun org-babel-J-print-block (x)
 139   "Prettify jconsole output X."
 140   (let* ((x (org-trim x))
 141          (a (obj-get-string-alignment x))
 142          (lines (split-string x "\n" t))
 143          b)
 144     (cond ((< a 0)
 145            (setq b (obj-match-second-space-right (nth 0 lines)))
 146            (concat (make-string (+ a b) ? ) x))
 147           ((> a 0)
 148            (setq b (obj-match-second-space-left (nth 0 lines)))
 149            (concat (make-string (- a b) ? ) x))
 150           (t x))))
 151
 152 (defun obj-match-second-space-left (s)
 153   "Return position of leftmost space in second space block of S or nil."
 154   (and (string-match "^ *[^ ]+\\( \\)" s)
 155        (match-beginning 1)))
 156
 157 (defun obj-match-second-space-right (s)
 158   "Return position of rightmost space in second space block of S or nil."
 159   (and (string-match "^ *[^ ]+ *\\( \\)[^ ]" s)
 160        (match-beginning 1)))
 161
 162 (defun obj-string-match-m (regexp string &optional start)
 163   "Call (string-match REGEXP STRING START).
 164 REGEXP is modified so that .* matches newlines as well."
 165   (string-match
 166    (replace-regexp-in-string "\\.\\*" "[\0-\377[:nonascii:]]*" regexp)
 167    string
 168    start))
 169
 170 (defun org-babel-j-initiate-session (&optional session)
 171   "Initiate a J session.
 172 SESSION is a parameter given by org-babel."
 173   (unless (string= session "none")
 174     (require 'j-console)
 175     (j-console-ensure-session)))
 176
 177 (provide 'ob-J)
 178
 179 ;;; ob-J.el ends here